ZIONS BANCORPORATION /UT/
SC 13D, 1999-06-18
NATIONAL COMMERCIAL BANKS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D
                                 (Rule 13d-101)

                    INFORMATION TO BE INCLUDED IN STATEMENTS
                         FILED PURSUANT TO 13d-1(a) AND
                  AMENDMENTS THERETO FILED PURSUANT TO 13D-2(a)

                              (Amendment No. ___)*


                              ZIONS BANCORPORATION
          ------------------------------------------------------------
                                (Name of Issuer)


                         COMMON STOCK, WITHOUT PAR VALUE
          ------------------------------------------------------------
                         (Title of Class of Securities)

                                    989701107
                ------------------------------------------------
                                 (CUSIP Number)

                                  BRAD D. HARDY
                           FIRST SECURITY CORPORATION
                                  79 SOUTH MAIN
                                 P.O. BOX 30006
                         SALT LAKE CITY, UTAH 84130-0006
                                 (801) 246-5976
          ------------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                  JUNE 8, 1999
          ------------------------------------------------------------
             (Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-1(a) for other
parties to whom copies are to be sent.

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

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

*          The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

      The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 (the "Act") or otherwise subject to the liabilities of that section
of the Act but shall be subject to all other provisions of the Act (however, see
the Notes).

<PAGE>


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    CUSIP NO. 989701107                 13D                Page 2 of 13 Pages

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- --------------------------------------------------------------------------------
   1         NAME OF REPORTING PERSON
             I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
                   FIRST SECURITY CORPORATION
                   I.R.S. IDENTIFICATION NO.:  87-6118148


- --------------------------------------------------------------------------------
   2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP        (a)[ ]
                                                                     (b)[ ]
- --------------------------------------------------------------------------------
   3         SEC USE ONLY

- --------------------------------------------------------------------------------
   4         SOURCE OF FUNDS
                   WC.
- --------------------------------------------------------------------------------
   5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
             PURSUANT TO ITEMS 2(d) OR 2(e)            [ ]
- --------------------------------------------------------------------------------
   6         CITIZENSHIP OR PLACE ORGANIZATION
                   DELAWARE.
- --------------------------------------------------------------------------------
              7   SOLE VOTING POWER
 NUMBER OF              15,724,539*
             -------------------------------------------------------------------
   SHARES     8   SHARED VOTING POWER
                        -0-
BENEFICIALLY
             -------------------------------------------------------------------
              9   SOLE DISPOSITIVE POWER
  OWNED BY              15,724,539

    EACH
             -------------------------------------------------------------------
              10  SHARED DISPOSITIVE POWER
 REPORTING              -0-

PERSON WITH
- --------------------------------------------------------------------------------
     11            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   THE REPORTING PERSON HAS ACQUIRED AN OPTION TO PURCHASE UP TO
                   15,724,539 SHARES OF FIRST SECURITY COMMON STOCK.
- --------------------------------------------------------------------------------
     12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
             SHARES                                         [ ]
- --------------------------------------------------------------------------------
     13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                   19.9
- --------------------------------------------------------------------------------
     14      TYPE OF REPORTING PERSON
                   CO.
- --------------------------------------------------------------------------------


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

*         Up to  15,724,539  shares of Common  Stock,  without  par value
("Zions Common Stock"), of Zions Bancorporation, a Utah corporation ("Zions"),
covered by this statement are obtainable by First Security Corporation, a
Delaware corporation ("First Security"), upon exercise of the option described
in Item 4 below, if the option were exercisable on the date hereof. First
Security expressly disclaims beneficial ownership of any such shares. Prior to
the existence of the Option (defined below), First Security was not entitled to
any rights of a stockholder of Zions with respect to such shares. The Option may
be exercised only upon the happening of certain events described in Item 4
below, none of which has occurred as of the date hereof, and none of which is in
the control of First Security. Dispositive and voting powers are summarized in
Items 4 and 5 below.


<PAGE>


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    CUSIP NO. 989701107                 13D                Page 3 of 13 Pages

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ITEM 1.     SECURITY AND ISSUER.

             (a)  This Schedule 13D relates to the common stock of Zions
                  Bancorporation, without par value.

             (b)  The principal executive offices of the Issuer are located at
                  One South Main, Suite 1830, Salt Lake City, Utah 84111.

ITEM 2.     IDENTITY AND BACKGROUND.

             (a)  The reporting person is First Security Corporation ("First
                  Security").

             (b) The reporting person is incorporated in Delaware.

             (c)  The reporting person's principal business is that of a holding
                  company for banking subsidiaries.

             (d)  The address of the reporting person's principal business and
                  principal office is 79 South Main, Salt Lake City, Utah
                  84130-0006.

             (e)  The reporting person has not been convicted in a criminal
                  proceeding during the last five years.

             (f)   The reporting person, during the last five years, was not
                  a party to any civil proceeding of a judicial or
                  administrative body of competent jurisdiction which
                  resulted in or is subject to a judgment, decree or final
                  order enjoining future violations of, or prohibiting or
                  mandating activities subject to, federal or state
                  securities laws or finding any violation with respect to
                  such laws.

ITEM 3.     SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

            It is presently anticipated that, should any purchase of Zions
            Common Stock be made by First Security pursuant to the Option
            Agreement described below in response to Item 4, or otherwise, the
            source of any funds used in any such purchase would be the available
            cash, cash equivalents, available for sale securities and bank
            financing of First Security.

ITEM 4.     PURPOSE OF TRANSACTION.

            A.  THE MERGER AGREEMENT.

            On June 6, 1999, Zions and First Security entered into an Agreement
            and Plan of Merger (the "Merger Agreement") pursuant to which Zions
            agreed to merge with and into First Security (the "Merger"), with
            First Security as the surviving corporation (the "Surviving
            Corporation"). The Merger is subject to receipt of regulatory
            approval, as well as an affirmative vote of the shareholders of
            Zions


<PAGE>


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    CUSIP NO. 989701107                 13D                Page 4 of 13 Pages

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            and First Security and certain other closing conditions. It is
            currently estimated that the Merger will be consummated in the
            fourth quarter of 1999, subject to satisfaction of such closing
            conditions.

            The terms of the Merger Agreement provide for a reverse stock split
            immediately prior to the Effective Time of the Merger (as defined in
            the Merger Agreement), in which each outstanding share of First
            Security Common Stock, par value $1.25 per share ("First Security
            Common Stock"), will be converted and reclassified as 0.442 of a
            share of the Surviving Corporation Common Stock. Holders of Zions
            Common Stock will then receive, in exchange for each share of Zions
            Common Stock (other than certain excluded shares) one share of the
            Surviving Corporation Common Stock. Upon consummation of the Merger,
            the articles of incorporation and by-laws of First Security, amended
            and restated as of the Effective Time, will be the articles of
            incorporation and by-laws of the Surviving Corporation. The Board of
            Directors of the Surviving Corporation, as described in Exhibit B to
            the Merger Agreement, shall be composed of 22 members, 11 designated
            by Zions and 11 designated by First Security.

            The Merger is subject to the approval of the Board of Governors of
            the Federal Reserve Board (the "Federal Reserve Board"), the
            approval of the shareholders of Zions, the approval of the
            stockholders of First Security, and the satisfaction of various
            other terms and conditions set forth in the Merger Agreement.

            B.  THE OPTION.

            As an inducement and a condition to First Security's entering into
            the Merger Agreement, on June 8, 1999, First Security and Zions
            entered into a Stock Option Agreement (the "Option Agreement")
            (replacing an earlier stock option agreement executed on June 6,
            1999), pursuant to which Zions granted First Security an option (the
            "Option") entitling it to purchase up to 15,724,539 (or such lesser
            amount as shall constitute 19.9% of the outstanding shares of Zions
            Common Stock on the date of exercise) fully paid and nonassessable
            shares of Zions Common Stock at a price per share equal to the
            average of the last sales price per share of Zions Common Stock on
            the NASDAQ National Market on June 4 and June 7, 1999 (the "Option
            Price"), subject to adjustment in certain circumstances.*



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

*       In the event of any change in the Zions Common Stock by reason of stock
dividends, stock splits, split-ups, recapitalizations, stock combinations,
exchanges of shares, or the like, the type and number of shares or securities
subject to the Option, and the Option Price therefor, shall be adjusted
appropriately, and proper provision shall be made in the agreements governing
such transaction so that First Security shall receive, upon exercise of the
Option, the number and class of shares or other securities or property that
First Security would have received in respect of the

                                                  (footnote continued)

<PAGE>

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    CUSIP NO. 989701107                 13D                Page 5 of 13 Pages

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            Subject to applicable law, regulatory restrictions and other certain
            conditions, First Security may exercise the Option, in whole or in
            part, after the occurrence of an Initial Triggering Event (as
            defined below), and a Subsequent Triggering Event (as defined below)
            and prior to an Exercise Termination Event (as defined below),
            provided that: (i) First Security shall have sent the written notice
            of such exercise (as described under the notice provisions below)
            within six months of such Subsequent Triggering Event, and (ii)
            First Security shall not be in material breach of any of its
            covenants or agreements contained in the Merger Agreement such that
            Zions shall be entitled to terminate the Merger Agreement pursuant
            to Section 8.01(b) thereof. At no point may the Option be exercised,
            as a whole or in part, to the extent that such exercise (or the
            acquisition of Option Shares thereunder) would, if it occurred on
            the date hereof, be inconsistent with any provision of the Merger
            Agreement.

            As defined in the Option Agreement, "Initial Triggering Event,"
            means the occurrence of any of the following events or transactions:

            1.   Zions or any of its Significant Subsidiaries (as defined in
                 Rule 1-02 of Regulation S-X) (the "Zions Subsidiaries"),
                 without having received First Security's prior written
                 consent, (i) shall have entered into an agreement to engage
                 in an Acquisition Transaction (as defined below) with any
                 person (the term "person," as used in the Option Agreement,
                 has the meaning assigned thereto in Sections 3(a)(9) and
                 13(d)(3) of the Securities Exchange Act of 1934, as amended,
                 and the rules and regulations thereunder), other than First
                 Security or any subsidiary of First Security, or (ii) the
                 Board of Directors of Zions shall have recommended that the
                 stockholders of Zions approve or accept any Acquisition
                 Transaction other than as contemplated by the Merger
                 Agreement.  For purposes of the Option Agreement,
                 "Acquisition Transaction," as defined in the Option
                 Agreement, means (x) a merger or consolidation, or any
                 similar transaction, involving Zions or any Zions Subsidiary
                 (other than such transactions involving solely Zions and/or

- -----------------------
(footnote continued)

Zions Common Stock if the Option had been exercised immediately prior to such
event, or the record date therefor, as applicable. If any additional shares of
the Zions Common Stock are issued after the date of the Option Agreement (other
than pursuant to an event described in the preceding sentence), the number of
shares of Zions Common Stock subject to the Option shall be adjusted so that,
after such issuance, it, together with any shares of Zions Common Stock
previously issued pursuant hereto, equals 19.9% of the number of shares of the
Zions Common Stock then issued and outstanding, without giving effect to any
shares subject to or issued pursuant to the Option.


<PAGE>


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    CUSIP NO. 989701107                 13D                Page 6 of 13 Pages

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

                 one or more wholly-owned Subsidiaries of Zions, provided
                 that any such transaction is not entered into in violation
                 of the terms of the Merger Agreement), (y) a purchase, lease
                 or other acquisition of all or a substantial part of the
                 assets or deposits of Zions or any Zions Subsidiary, or (z)
                 a purchase or other acquisition (including by way of merger,
                 consolidation, share exchange or otherwise) of securities
                 representing 10% or more of the voting power of Zions or any
                 Zions Subsidiary;

            2.   Any person (other than First Security or any subsidiary of
                 First Security) shall have acquired Beneficial Ownership or the
                 right to acquire Beneficial Ownership, of 10% or more of the
                 outstanding shares of Zions Common Stock (the term "Beneficial
                 Ownership" as used in the Option Agreement has the meaning
                 assigned thereto in Section 13(d) of the Exchange Act, and the
                 rules and regulations thereunder);

            3.   The stockholders of Zions shall have voted and failed to
                 approve the Merger Agreement and the Merger at a meeting of
                 such stockholders held for the purpose of voting on the
                 Merger Agreement, or any adjournment or postponement
                 thereof, or such meeting shall not have been held in
                 violation of the Merger Agreement or shall have been
                 canceled prior to termination of the Merger Agreement, if
                 prior to such meeting (or if such meeting shall not have
                 been held or shall have been canceled, prior to such
                 termination), it shall have been publicly announced that any
                 person (other than First Security or any subsidiary of First
                 Security) shall have made, or disclosed an intention to
                 make, a proposal to engage in an Acquisition Transaction.

            4.   Zions' Board of Directors shall have withdrawn or modified
                 (or publicly announced its intention to withdraw, modify or
                 qualify) in any manner adverse in any respect to First
                 Security its recommendation that the stockholders of Zions
                 approve the transactions contemplated by the Merger
                 Agreement, or Zions or any Zions Subsidiary shall have
                 authorized, recommended, proposed (or publicly announced its
                 intention to authorize, recommend or propose) an agreement
                 to engage in an Acquisition Transaction with any person
                 other than First Security or a First Security Subsidiary.

            5.   Any person other than First Security or any First Security
                 Subsidiary shall have filed with the SEC a registration
                 statement or tender offer materials with respect to a
                 potential exchange or tender offer that would constitute an
                 Acquisition Transaction or filed a preliminary proxy
                 statement with the Securities and Exchange Commission with
                 respect to a potential vote by its shareholders to approve
                 the issuance of shares to be offered in such an exchange
                 offer);

            6.   Zions shall have willfully breached any covenant or obligation
                 contained in the Merger Agreement in anticipation of an
                 Acquisition Transaction, and


<PAGE>

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    CUSIP NO. 989701107                 13D                Page 7 of 13 Pages

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

                 following such breach First Security would be entitled to
                 terminate the Merger Agreement (whether immediately or after
                 the giving of notice or passage of time or both); or

            7.   Any person (other than First Security or any subsidiary of
                 First Security), without First Security's prior written
                 consent, shall have filed an application or notice with the
                 Board of Governors of the Federal Reserve System or other
                 federal or state bank regulatory or antitrust authority,
                 which application or notice has been accepted for
                 processing, for approval to engage in an Acquisition
                 Transaction.

                 As defined in the Option Agreement, "Subsequent Triggering
                 Event," means the occurrence of any of the following events or
                 transactions:

            1.   The acquisition by any person other than First Security or any
                 of its subsidiaries of beneficial ownership of 25% or more of
                 the then outstanding shares of Zions Common Stock; or

            2.   The occurrence of an Initial Triggering Event (as defined
                 above) described in paragraph (1) under the definition of
                 "Initial Triggering Event" above, except that the percentage
                 referred to in clause (z) of such paragraph (1) shall be 25%.

                 As defined in the Option Agreement, "Exercise Termination
                 Event" means any one of the following events:

            1.   The Effective Time of the Merger;

            2.   The termination of the Merger Agreement in accordance with the
                 terms thereof prior to the occurrence of an Initial Triggering
                 Event except a termination by First Security pursuant to
                 Section 8.01(b) of the Merger Agreement (a "Listed
                 Termination"); or

            3.   The passage of 18 months (or such longer period if extended
                 under Section 10 of the Option Agreement) after termination of
                 the Merger Agreement if such termination follows the occurrence
                 of an Initial Triggering Event or is a Listed Termination.

            As provided in the Option Agreement, in the event that First
            Security is entitled to and wishes to exercise the Option, it must
            send to Zions a written notice (the date of which is referred to in
            the Option Agreement as the "Notice Date") specifying (1) the total
            number of shares of Zions Common Stock which First Security intends
            to purchase pursuant to such exercise and (2) a place and date for
            the closing that shall not be less than three business days nor more
            than 60 business days from the Notice Date; provided, however, that
            if prior notification to or approval of the Federal Reserve Board or
            any other regulatory authority or antitrust agency is required in
            connection with such purchase, First Security will

<PAGE>

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    CUSIP NO. 989701107                 13D                Page 8 of 13 Pages

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

            promptly file and expeditiously process the required notice or
            application for approval.

            Under the Bank Holding Company Act of 1956 (the "BHC Act"), First
            Security may not directly or indirectly acquire more than 5% of the
            outstanding shares of any class of voting securities of Zions
            without application to and prior approval from the Federal Reserve
            Board.

            The Option may be assigned by First Security in certain
            circumstances, subject to the terms and conditions described in the
            Option Agreement.

            In addition, any shares of Zions Common Stock purchased upon the
            exercise of the Option may be resold by First Security pursuant to
            registration rights under the Option Agreement.

            A "Repurchase Event" shall be deemed to occur if: (i) a person
            (other than First Security or any First Security subsidiary)
            acquires (A) beneficial ownership of 50% or more of the then
            outstanding Zions Common Stock, or (B) beneficial ownership of 15%
            or more of the then outstanding Zions Common Stock if Zions shall
            have violated Section 6.16 of the Merger Agreement; or (ii) any
            Acquisition Transaction (as defined above) is consummated. Upon
            occurrence of a Repurchase Event, (i) at the request of First
            Security, delivered prior to an Exercise Termination Event, Zions
            has agreed to repurchase the Option from First Security at a price
            (the "Option Repurchase Price") equal to (x) the amount by which (A)
            the market/offer price (as defined below) exceeds (B) the Option
            Price, multiplied by the number of shares for which the Option may
            then be exercised and (ii) at the request of the owner of any shares
            that have been issued upon exercise of the Option (the "Option
            Shares"), Zions has agreed to repurchase such number of the Option
            Shares from the owner thereof as the owner shall designate at a
            price (the "Option Share Repurchase Price") equal to (x) the
            market/offer price multiplied by the number of Option Shares so
            designated. The term "market/offer price" shall mean the highest of
            (i) the price per share of Zions Common Stock at which a tender
            offer or exchange offer therefor has been made, (ii) the price per
            share of Zions Common Stock to be paid by any third party pursuant
            to an agreement with Zions, (iii) the highest closing price for
            shares of Zions Common Stock within the six-month period immediately
            preceding the date the holder or owner gave notice of the required
            repurchase, or (iv) in the event of a sale of all or any substantial
            part of Zions' assets or deposits, the sum of the price paid in such
            sale for such assets and the current market value of the remaining
            assets of Zions as determined by a nationally-recognized independent
            investment banking firm mutually selected by First Security or the
            owner of the Options Shares, as the case may be, and reasonably
            acceptable to Zions, divided by the number of shares of Zions Common
            Stock outstanding at the time of such sale.

<PAGE>


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    CUSIP NO. 989701107                 13D                Page 9 of 13 Pages

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            First Security may, at any time following a Repurchase Event and
            prior to the occurrence of an Exercise Termination Event, relinquish
            the Option (together with any Option Shares issued to and then owned
            by First Security) to Zions in exchange for a cash fee equal to $160
            million (i) plus, if applicable, First Security's purchase price
            with respect to any Option Shares and (ii) minus, if applicable, the
            excess of (A) the net price, if any, received by First Security or a
            First Security Subsidiary pursuant to the sale of Option Shares (or
            any other securities into which such Option Shares were converted or
            exchanged) to any unaffiliated party, over (B) First Security's
            purchase price of such Option Shares.

            If, prior to an Exercise Termination Event, Zions enters into
            certain agreements relating to the consolidation or merger of Zions
            or the sale of substantially all of its assets or deposits, Zions is
            required to make proper provision so that the Option will, upon
            consummation of such transaction, be converted into, or exchanged
            for, an option (the "Substitute Option"), at First Security's
            election, in the Acquiring Corporation (as defined in the Option
            Agreement) or in any person that controls the Acquiring Corporation.
            The Substitute Option generally will have the same terms and
            conditions as the Option; provided, however, that to the extent
            terms and conditions of the Substitute Option cannot legally be
            identical to those of the Option, they will be as similar as
            possible, and in no event will be less advantageous to First
            Security.

            The Substitute Option shall be exercisable for such number of shares
            of the common stock of the Acquiring Corporation or any person that
            controls the Acquiring Corporation (the "Substitute Common Stock")
            as is equal to the market/offer price (defined in the paragraph
            describing "Repurchase Events" above) multiplied by the number of
            shares of Common Stock for which the Option was exercisable
            immediately prior to the event described in the preceding paragraph,
            divided by the average closing price of one share of Substitute
            Common Stock for the year immediately prior to the event described
            in the preceding paragraph, but in no event higher than the closing
            price of one share of the Substitute Common Stock on the day
            immediately prior to the event in the preceding paragraph. The
            exercise price of the Substitute Option per share of Substitute
            Common Stock shall be equal to the Option Price multiplied by a
            fraction, the numerator of which shall be the number of shares of
            Zions Common Stock for which the Option was exercisable immediately
            prior to the event described in the preceding paragraph and the
            denominator of which shall be the number of shares of Substitute
            Common Stock for which the Substitute Option is exercisable. In no
            event, however, shall the Substitute Option be exercisable for more
            than 19.9% of the shares of Substitute Common Stock outstanding
            prior to exercise of the Substitute Option.

            At the request of the holder of the Substitute Option, the issuer of
            the Substitute Option shall repurchase the Substitute Option at a
            price (the "Substitute Option Repurchase Price") equal to the amount
            by which (i) the Highest Closing Price (as hereinafter defined)
            exceeds (ii) the exercise price of the Substitute Option,

<PAGE>

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    CUSIP NO. 989701107                 13D               Page 10 of 13 Pages

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



            multiplied by the number of shares of Substitute Common Stock for
            which the Substitute Option may then be exercised, and at the
            request of the owner of shares of Substitute Common Stock (the
            "Substitute Shares"), the Substitute Option Issuer shall repurchase
            the Substitute Shares at a price equal to the Highest Closing Price
            multiplied by the number of Substitute Shares so designated. The
            term "Highest Closing Price" shall mean the highest closing price
            for shares of Substitute Common Stock within the six-month period
            immediately preceding the date the holder of the Substitute Option
            gives notice of the required repurchase of the Substitute Option or
            owner of the Substitute Shares gives notice of the required
            repurchase of the Substitute Shares, as applicable.

            In certain circumstances related to the exercise of the Option, the
            time periods specified in the Option Agreement will be extended (1)
            to the extent necessary to obtain all regulatory approvals (so long
            as Holder, the Substitute Option Holder, or Substitute Share Owner
            is using commercially reasonable efforts to obtain such approval)
            and for the expiration of all statutory waiting periods; (2) to the
            extent necessary to avoid liability under Section 16(b) of the
            Exchange Act by reason of such exercise; and (3) while there exists
            an injunction, order or judgment prohibiting or delaying the
            exercise of such right.

            Copies of the Option Agreement and the Merger Agreement are filed as
            exhibits to this Schedule 13D and are incorporated herein by
            reference. The foregoing summary is not intended to be complete and
            is qualified in its entirety by reference to such exhibits.

            C.  PURCHASES OF ZIONS COMMON STOCK.

            Subject to market conditions and developments with respect to the
            Merger, First Security may purchase shares of Zions Common Stock in
            the open market or in privately negotiated transactions, to the
            extent permitted by the BHC Act and federal securities laws.

            Other than as described above or in item 5 below, First Security
            does not have any plans or proposals which relate to or would result
            in any of the matters listed in item 4(a)-(j) of Schedule 13D.

ITEM 5.     INTEREST IN SECURITIES OF THE ISSUER.

             (a)   The Option.  As a result of entry into the Option
                  Agreement and the granting of the Option thereunder,
                  pursuant to Rule 13d-3(d)(i) under the Exchange Act, First
                  Security is deemed to own beneficially 15,724,539 shares of
                  Zions Common Stock (or such lesser amount as shall
                  constitute 19.9% of the outstanding shares of Zions Common
                  Stock on the date of exercise), constituting approximately
                  19.9% of the shares of Zions Common Stock issued and
                  outstanding as of June 8, 1999.   First Security expressly
                  disclaims any beneficial ownership of the 15,724,539 shares of

<PAGE>

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    CUSIP NO. 989701107                 13D                Page 11 of 13 Pages

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

                  Zions Common Stock which are obtainable by First
                  Security upon exercise of the Option because the Option is
                  exercisable only in the circumstances set forth in the
                  Option Agreement, which is described in Item 4 hereof, none
                  of which has occurred as of the date hereof and only then
                  with regulatory approval (if, as a consequence, First
                  Security would own more than 5% of the outstanding shares
                  of Zions Common Stock).

             (b)  If First Security were to exercise the Option, it would have
                  sole power to vote and, subject to the terms of the Option
                  Agreement, sole power to direct the disposition of, the shares
                  of Zions Common Stock covered thereby.

             (c) Not applicable.

             (d) Not applicable.

             (e) Not applicable.

ITEM 6.     CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
            RESPECT TO SECURITIES OF THE ISSUER.

            Except for the Option Agreement and the Merger Agreement described
            in Item 4 above, there are no contracts, arrangements,
            understandings or relationships (legal or otherwise) between the
            reporting person and any person with respect to any securities of
            the Issuer.

ITEM 7.     MATERIAL TO BE FILED AS EXHIBITS.

            The following documents are filed as exhibits to this Schedule 13D:

            1.   Agreement and Plan of Merger, dated as of June 6, 1999 by
                 and among Zions Bancorporation and First Security
                 Corporation (incorporated by reference to the Schedule 13D
                 filed with the Securities and Exchange Commission by Zions
                 Bancorporation on June 16, 1999).

            2.   Stock Option Agreement, dated as of June 8, 1999, by and
                 between First Security Corporation and Zions Bancorporation.


<PAGE>

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    CUSIP NO. 989701107                 13D                Page 12 of 13 Pages

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                                  SIGNATURES

            After reasonable inquiry and to the best knowledge and belief of the
undersigned, the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated:  June 17, 1999                              First Security Corporation

                                       By: /S/ Brad D. Hardy

                                                   Name:  Brad D. Hardy
                                                   Title:  Executive Vice
                                                   President, Corporate
                                                   Services, General Counsel,
                                                   Chief Financial Officer and
                                                   Secretary


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    CUSIP NO. 989701107                 13D                Page 13 of 13 Pages

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                                EXHIBIT INDEX

99.1        Agreement and Plan of Merger, dated as of June 6, 1999 by and among
            Zions Bancorporation and First Security Corporation (incorporated by
            reference to the Schedule 13D filed with the Securities and Exchange
            Commission by Zions Bancorporation on June 16, 1999).

99.2        Stock Option Agreement, dated as of June 8, 1999, by and between
            First Security Corporation and Zions Bancorporation.






                             STOCK OPTION AGREEMENT

     STOCK OPTION AGREEMENT, dated as of June 8, 1999, between First Security
Corporation, a Delaware corporation ("GRANTEE"), and Zions Bancorporation, a
Utah corporation ("ISSUER").

                                    RECITALS

          A. MERGER AGREEMENT. Grantee and Issuer have entered into an Agreement
and Plan of Merger, dated as of June 6, 1999 (the "MERGER AGREEMENT"); and

          B. OPTION. As a condition to Grantee's entering into the Merger
Agreement and in consideration therefor and in consideration for the option
granted to Issuer by Grantee pursuant to an option agreement dated as of the
date hereof, Issuer has agreed to grant Grantee the Option (as hereinafter
defined).

     NOW, THEREFORE, in consideration of the foregoing and the mutual covenants
and agreements set forth herein and in the Merger Agreement, the parties hereto
agree as follows:

     1. (a) Issuer hereby grants to Grantee an unconditional, irrevocable option
(the "OPTION") to purchase, subject to the terms hereof, up to an aggregate of
15,724,539 fully paid and nonassessable shares of the common stock, no par
value, of Issuer ("COMMON STOCK") at a price per share equal to $64.25;
PROVIDED, HOWEVER, that in no event shall the number of shares for which this
Option is exercisable exceed 19.9% of the issued and outstanding shares of
Common Stock. The number of shares of Common Stock that may be received upon the
exercise of the Option and the Option Price are subject to adjustment as herein
set forth.

     (b) In the event that any additional shares of Common Stock are issued or
otherwise become outstanding after the date of this Agreement (other than
pursuant to this Agreement and other than pursuant to an event described in the
second sentence of Section 5 hereof), the number of shares of Common Stock
subject to the Option shall be increased so that, after such issuance, such
number together with any shares of Common Stock previously issued pursuant
hereto, equals 19.9% of the number of shares of Common Stock then issued and
outstanding without giving effect to any shares subject or issued pursuant to
the Option. Nothing contained in this Section l(b) or elsewhere in this
Agreement shall be deemed to authorize Issuer to issue shares in breach of any
provision of the Merger Agreement.

     2. (a) The Holder (as hereinafter defined) may exercise the Option, in
whole or part, if, but only if, both an Initial Triggering Event (as hereinafter
defined) and a Subsequent Triggering Event (as hereinafter defined) shall have
occurred prior to the occurrence of an Exercise Termination Event (as
hereinafter defined), PROVIDED that the Holder shall have sent the written
notice of such exercise (as provided in subsection (e) of this Section 2) within
six (6) months following such Subsequent Triggering Event (or such later period
as provided in Section 10).


<PAGE>

Each of the following shall be an Exercise Termination Event: (i) the Effective
Time of the Merger; (ii) termination of the Merger Agreement in accordance with
the provisions thereof if such termination occurs prior to the occurrence of an
Initial Triggering Event except a termination by Grantee pursuant to Section
8.01(b) of the Merger Agreement (a "LISTED TERMINATION"); or (iii) the passage
of eighteen (18) months (or such longer period as provided in Section 10) after
termination of the Merger Agreement if such termination follows the occurrence
of an Initial Triggering Event or is a Listed Termination. The term "HOLDER"
shall mean the holder or holders of the Option. Notwithstanding anything to the
contrary contained herein, the Option may not be exercised at any time when
Grantee shall be in material breach of any of its covenants or agreements
contained in the Merger Agreement such that Issuer shall be entitled to
terminate the Merger Agreement pursuant to Section 8.01(b) thereof. Anything to
the contrary notwithstanding, at no point may the Option be exercised, as a
whole or in part, to the extent that such exercise (or the acquisition of Option
Shares thereunder) would, if it occurred on the date hereof, be inconsistent
with any provision of the Merger Agreement.

     (b) The term "INITIAL TRIGGERING EVENT" shall mean any of the following
events or transactions occurring on or after the date hereof:

         (i) Issuer or any of its Significant Subsidiaries (as defined in Rule
     1-02 of Regulation S-X promulgated by the Securities and Exchange
     Commission (the "SEC")) (the "ISSUER SUBSIDIARIES"), without having
     received Grantee's prior written consent, shall have entered into an
     agreement to engage in an Acquisition Transaction (as hereinafter defined)
     with any person (the term "PERSON" for purposes of this Agreement having
     the meaning assigned thereto in Sections 3(a)(9) and 13(d)(3) of the
     Securities Exchange Act of 1934, as amended (the "1934 ACT"), and the rules
     and regulations thereunder) other than Grantee or any of its Subsidiaries
     (each a "GRANTEE SUBSIDIARY") or the Board of Directors of Issuer (the
     "ISSUER BOARD") shall have recommended that the shareholders of Issuer
     approve or accept any Acquisition Transaction other than as contemplated by
     the Merger Agreement. For purposes of this Agreement, (a) "ACQUISITION
     TRANSACTION" shall mean (x) a merger or consolidation, or any similar
     transaction, involving Issuer or any Issuer Subsidiary (other than mergers,
     consolidations or similar transactions involving solely Issuer and/or one
     or more wholly-owned Subsidiaries of the Issuer, PROVIDED, any such
     transaction is not entered into in violation of the terms of the Merger
     Agreement), (y) a purchase, lease or other acquisition of all or any
     substantial part of the assets or deposits of Issuer or any Issuer
     Subsidiary, or (z) a purchase or other acquisition (including by way of
     merger, consolidation, share exchange or otherwise) of securities
     representing 10% or more of the voting power of Issuer or any Issuer
     Subsidiary and (b) "SUBSIDIARY" shall have the meaning set forth in Rule
     12b-2 under the 1934 Act;

        (ii) Any person other than the Grantee or any Grantee Subsidiary shall
     have acquired beneficial ownership or the right to acquire beneficial
     ownership of 10% or more of the outstanding shares of Common Stock (the
     term "BENEFICIAL OWNERSHIP" for purposes of this


                                      -2-
<PAGE>

     Agreement having the meaning assigned thereto in Section 13(d) of the 1934
     Act, and the rules and regulations thereunder);

       (iii) The shareholders of Issuer shall have voted and failed to approve
     the Merger Agreement and the Merger at a meeting which has been held for
     that purpose or any adjournment or postponement thereof, or such meeting
     shall not have been held in violation of the Merger Agreement or shall have
     been canceled prior to termination of the Merger Agreement if, prior to
     such meeting (or if such meeting shall not have been held or shall have
     been canceled, prior to such termination), it shall have been publicly
     announced that any person (other than Grantee or any of its Subsidiaries)
     shall have made, or disclosed an intention to make, a proposal to engage in
     an Acquisition Transaction;

        (iv) The Issuer Board shall have withdrawn, modified or qualified (or
     publicly announced its intention to withdraw, modify or qualify) in any
     manner adverse in any respect to Grantee its recommendation that the
     shareholders of Issuer approve the transactions contemplated by the Merger
     Agreement, or Issuer or any Issuer Subsidiary shall have authorized,
     recommended, proposed (or publicly announced its intention to authorize,
     recommend or propose) an agreement to engage in an Acquisition Transaction
     with any person other than Grantee or a Grantee Subsidiary;

         (v) Any person other than Grantee or any Grantee Subsidiary shall have
     filed with the SEC a registration statement or tender offer materials with
     respect to a potential exchange or tender offer that would constitute an
     Acquisition Transaction (or filed a preliminary proxy statement with the
     SEC with respect to a potential vote by its shareholders to approve the
     issuance of shares to be offered in such an exchange offer);

        (vi) Issuer shall have willfully breached any covenant or obligation
     contained in the Merger Agreement in anticipation of an Acquisition
     Transaction, and following such breach Grantee would be entitled to
     terminate the Merger Agreement (whether immediately or after the giving of
     notice or passage of time or both); or

       (vii) Any person other than Grantee or any Grantee Subsidiary, without
     Grantee's prior written consent, shall have filed an application or notice
     with the Board of Governors of the Federal Reserve System (the "FEDERAL
     RESERVE BOARD") or other federal or state bank regulatory or antitrust
     authority, which application or notice has been accepted for processing,
     for approval to engage in an Acquisition Transaction.

     (c) The term "SUBSEQUENT TRIGGERING EVENT" shall mean any of the following
events or transactions occurring after the date hereof:

         (i) The acquisition by any person (other than Grantee or any Grantee
     Subsidiary) of beneficial ownership of 25% or more of the then outstanding
     Common Stock; or


                                      -3-
<PAGE>

        (ii) The occurrence of the Initial Triggering Event described in clause
     (i) of subsection (b) of this Section 2, except that the percentage
     referred to in clause (z) of the second sentence thereof shall be 25%.

     (d) Issuer shall notify Grantee promptly in writing of the occurrence of
any Initial Triggering Event or Subsequent Triggering Event (together, a
"TRIGGERING EVENT"), it being understood that the giving of such notice by
Issuer shall not be a condition to the right of the Holder to exercise the
Option.

     (e) In the event the Holder is entitled to and wishes to exercise the
Option (or any portion thereof), it shall send to Issuer a written notice (the
date of which being herein referred to as the "NOTICE DATE") specifying (i) the
total number of shares it will purchase pursuant to such exercise and (ii) a
place and date not earlier than three business days nor later than 60 business
days from the Notice Date for the closing of such purchase (the "CLOSING DATE");
PROVIDED, that if prior notification to or approval of the Federal Reserve Board
or any other regulatory or antitrust agency is required in connection with such
purchase, the Holder shall promptly file the required notice or application for
approval, shall promptly notify Issuer of such filing and shall expeditiously
process the same and the period of time that otherwise would run pursuant to
this sentence shall run instead from the date on which any required notification
periods have expired or been terminated or such approvals have been obtained and
any requisite waiting period or periods shall have passed. Any exercise of the
Option shall be deemed to occur on the Notice Date relating thereto.

     (f) At the closing referred to in subsection (e) of this Section 2, the
Holder shall (i) pay to Issuer the aggregate purchase price for the shares of
Common Stock purchased pursuant to the exercise of the Option in immediately
available funds by wire transfer to a bank account designated by Issuer and (ii)
present and surrender this Agreement to Issuer at its principal executive
offices, PROVIDED that the failure or refusal of the Issuer to designate such a
bank account or accept surrender of this Agreement shall not preclude the Holder
from exercising the Option.

     (g) At such closing, simultaneously with the delivery of immediately
available funds as provided in subsection (f) of this Section 2, Issuer shall
deliver to the Holder a certificate or certificates representing the number of
shares of Common Stock purchased by the Holder and, if the Option should be
exercised in part only, a new Option evidencing the rights of the Holder thereof
to purchase the balance of the shares purchasable hereunder.

     (h) Certificates for Common Stock delivered at a closing hereunder may be
endorsed with a restrictive legend that shall read substantially as follows:

          "The transfer of the shares represented by this certificate is subject
     to certain provisions of an agreement between the registered holder hereof
     and Issuer and to resale restrictions


                                      -4-
<PAGE>

     arising under the Securities Act of 1933, as amended. A copy of such
     agreement is on file at the principal office of Issuer and will be provided
     to the holder hereof without charge upon receipt by Issuer of a written
     request therefor."

It is understood and agreed that: (i) the reference to the resale restrictions
of the Securities Act of 1933, as amended (the "1933 ACT") in the above legend
shall be removed by delivery of substitute certificate(s) without such reference
if the Holder shall have delivered to Issuer a copy of a letter from the staff
of the SEC, or an opinion of counsel, in form and substance reasonably
satisfactory to Issuer, to the effect that such legend is not required for
purposes of the 1933 Act; (ii) the reference to the provisions of this Agreement
in the above legend shall be removed by delivery of substitute certificate(s)
without such reference if the shares have been sold or transferred in compliance
with the provisions of this Agreement and under circumstances that do not
require the retention of such reference in the opinion of counsel to the Holder,
in form and substance reasonably satisfactory to the Issuer; and (iii) the
legend shall be removed in its entirety if the conditions in the preceding
clauses (i) and (ii) are both satisfied. In addition, such certificates shall
bear any other legend as may be required by law.

     (i) Upon the giving by the Holder to Issuer of the written notice of
exercise of the Option provided for under subsection (e) of this Section 2 and
the tender of the applicable purchase price in immediately available funds, the
Holder shall be deemed to be the holder of record of the shares of Common Stock
issuable upon such exercise, notwithstanding that the stock transfer books of
Issuer shall then be closed or that certificates representing such shares of
Common Stock shall not then be actually delivered to the Holder. Issuer shall
pay all expenses, and any and all United States federal, state and local taxes
and other charges that may be payable in connection with the preparation, issue
and delivery of stock certificates under this Section 2 in the name of the
Holder or its assignee, transferee or designee.

     3. Issuer agrees: (i) that it shall at all times maintain, free from
preemptive rights, sufficient authorized but unissued or treasury shares of
Common Stock so that the Option may be exercised without additional
authorization of Common Stock after giving effect to all other options,
warrants, convertible securities and other rights to purchase Common Stock; (ii)
that it will not, by charter amendment or through reorganization, consolidation,
merger, dissolution or sale of assets, or by any other voluntary act, avoid or
seek to avoid the observance or performance of any of the covenants,
stipulations or conditions to be observed or performed hereunder by Issuer;
(iii) promptly to take all action as may from time to time be required
(including (x) complying with all applicable premerger notification, reporting
and waiting period requirements specified in 15 U.S.C. Section 18a and
regulations promulgated thereunder and (y) in the event, under the Bank Holding
Company Act of 1956, as amended (the "BHCA"), or the Change in Bank Control Act
of 1978, as amended, or any state or other federal banking law, prior approval
of or notice to the Federal Reserve Board or to any state or other federal
regulatory authority is necessary before the Option may be exercised,
cooperating fully with the Holder in preparing such applications or notices and
providing such information to the Federal Reserve


                                      -5-
<PAGE>

Board or such state or other federal regulatory authority as they may require)
in order to permit the Holder to exercise the Option and Issuer duly and
effectively to issue shares of Common Stock pursuant hereto; and (iv) promptly
to take all action provided herein to protect the rights of the Holder against
dilution.

     4. This Agreement (and the Option granted hereby) are exchangeable, without
expense, at the option of the Holder, upon presentation and surrender of this
Agreement at the principal office of Issuer, for other Agreements providing for
Options of different denominations entitling the holder thereof to purchase, on
the same terms and subject to the same conditions as are set forth herein, in
the aggregate the same number of shares of Common Stock purchasable hereunder.
The terms "AGREEMENT" and "OPTION" as used herein include any Agreements and
related Options for which this Agreement (and the Option granted hereby) may be
exchanged. Upon receipt by Issuer of evidence reasonably satisfactory to it of
the loss, theft, destruction or mutilation of this Agreement, and (in the case
of loss, theft or destruction) of reasonably satisfactory indemnification, and
upon surrender and cancellation of this Agreement, if mutilated, Issuer will
execute and deliver a new Agreement of like tenor and date. Any such new
Agreement executed and delivered shall constitute an additional contractual
obligation on the part of Issuer, whether or not the Agreement so lost, stolen,
destroyed or mutilated shall at any time be enforceable by anyone.

     5. In addition to the adjustment in the number of shares of Common Stock
that are purchasable upon exercise of the Option pursuant to Section 1 of this
Agreement, the number of shares of Common Stock purchasable upon the exercise of
the Option and the Option Price shall be subject to adjustment from time to time
as provided in this Section 5. In the event of any change in Common Stock by
reason of a stock dividend, stock split, split-up, recapitalization, stock
combination, exchange of shares or similar transaction, the type and number of
shares or securities subject to the Option, and the Option Price therefor, shall
be adjusted appropriately, and proper provision shall be made in the agreements
governing such transaction so that Grantee shall receive, upon exercise of the
Option, the number and class of shares or other securities or property that
Grantee would have received in respect of Common Stock if the Option had been
exercised immediately prior to such event, or the record date therefor, as
applicable. If any additional shares of Common Stock are issued after the date
of this Agreement (other than pursuant to an event described in the second
sentence of this Section 5), the number of shares of Common Stock subject to the
Option shall be adjusted so that, after such issuance, it, together with any
shares of Common Stock previously issued pursuant hereto, equals 19.9% of the
number of shares of Common Stock then issued and outstanding, without giving
effect to any shares subject to or issued pursuant to the Option.

     6. Upon the occurrence of a Subsequent Triggering Event that occurs prior
to an Exercise Termination Event, Issuer shall, at the request of Grantee
delivered within twelve (12) months (or such later period as provided in Section
10) of such Subsequent Triggering Event (whether on its own behalf or on behalf
of any subsequent holder of this Option (or part thereof) or any of the


                                      -6-
<PAGE>

shares of Common Stock issued pursuant hereto), promptly prepare, file and keep
current a registration statement under the 1933 Act covering any shares issued
and issuable pursuant to this Option and shall use its reasonable best efforts
to cause such registration statement to become effective and remain current in
order to permit the sale or other disposition of any shares of Common Stock
issued upon total or partial exercise of this Option ("OPTION SHARES") in
accordance with any plan of disposition requested by Grantee. Issuer will use
its reasonable best efforts to cause such registration statement promptly to
become effective and then to remain effective for such period not in excess of
180 days from the day such registration statement first becomes effective or
such shorter time as may be reasonably necessary to effect such sales or other
dispositions. Grantee shall have the right to demand two such registrations. The
Issuer shall bear the costs of such registrations (including, but not limited
to, Issuer's attorneys' fees, printing costs and filing fees, except for
underwriting discounts or commissions, brokers' fees and the fees and
disbursements of Grantee's counsel related thereto). The foregoing
notwithstanding, if, at the time of any request by Grantee for registration of
Option Shares as provided above, Issuer is in registration with respect to an
underwritten public offering by Issuer of shares of Common Stock, and if in the
good faith judgment of the managing underwriter or managing underwriters, or, if
none, the sole underwriter or underwriters, of such offering the offer and sale
of the Option Shares would interfere with the successful marketing of the shares
of Common Stock offered by Issuer, the number of Option Shares otherwise to be
covered in the registration statement contemplated hereby may be reduced;
PROVIDED, HOWEVER, that after any such required reduction the number of Option
Shares to be included in such offering for the account of the Holder shall
constitute at least 33-1/3% of the total number of shares to be sold by the
Holder and Issuer in the aggregate; and PROVIDED FURTHER, HOWEVER, that if such
reduction occurs, then Issuer shall file a registration statement for the
balance as promptly as practicable thereafter as to which no reduction pursuant
to this Section 6 shall be permitted or occur and the Holder shall thereafter be
entitled to one additional registration and the twelve (12) month period
referred to in the first sentence of this section shall be increased to
twenty-four (24) months. Each such Holder shall provide all information
reasonably requested by Issuer for inclusion in any registration statement to be
filed hereunder. If requested by any such Holder in connection with such
registration, Issuer shall become a party to any underwriting agreement relating
to the sale of such shares, but only to the extent of obligating itself in
respect of representations, warranties, indemnities and other agreements
customarily included in such underwriting agreements for Issuer. Upon receiving
any request under this Section 6 from any Holder, Issuer agrees to send a copy
thereof to any other person known to Issuer to be entitled to registration
rights under this Section 6, in each case by promptly mailing the same, postage
prepaid, to the address of record of the persons entitled to receive such
copies. Notwithstanding anything to the contrary contained herein, in no event
shall the number of registrations that Issuer is obligated to effect be
increased by reason of the fact that there shall be more than one Holder as a
result of any assignment or division of this Agreement.

     7. (a) At any time after the occurrence of a Repurchase Event (as defined
below) (i) at the request of the Holder, delivered prior to an Exercise
Termination Event (or such later period as


                                      -7-
<PAGE>

provided in Section 10), Issuer (or any successor thereto) shall repurchase the
Option from the Holder at a price (the "OPTION REPURCHASE PRICE") equal to the
amount by which (A) the market/offer price (as defined below) exceeds (B) the
Option Price, multiplied by the number of shares for which this Option may then
be exercised and (ii) at the request of the owner of Option Shares from time to
time (the "OWNER"), delivered prior to an Exercise Termination Event (or such
later period as provided in Section 10), Issuer (or any successor thereto) shall
repurchase such number of the Option Shares from the Owner as the Owner shall
designate at a price (the "OPTION SHARE REPURCHASE PRICE") equal to the
market/offer price multiplied by the number of Option Shares so designated. The
term "MARKET/OFFER PRICE" shall mean the highest of (i) the price per share of
Common Stock at which a tender or exchange offer therefor has been made, (ii)
the price per share of Common Stock to be paid by any third party pursuant to an
agreement with Issuer, (iii) the highest closing price for shares of Common
Stock within the six-month period immediately preceding the date the Holder
gives notice of the required repurchase of this Option or the Owner gives notice
of the required repurchase of Option Shares, as the case may be, or (iv) in the
event of a sale of all or any substantial part of Issuer's assets or deposits,
the sum of the net price paid in such sale for such assets or deposits and the
current market value of the remaining net assets of Issuer as determined by a
nationally recognized investment banking firm selected by the Holder or the
Owner, as the case may be, and reasonably acceptable to Issuer, divided by the
number of shares of Common Stock of Issuer outstanding at the time of such sale.
In determining the market/offer price, the value of consideration other than
cash shall be determined by a nationally recognized investment banking firm
selected by the Holder or Owner, as the case may be, and reasonably acceptable
to Issuer.

     (b) The Holder and the Owner, as the case may be, may exercise its right to
require Issuer to repurchase the Option and any Option Shares pursuant to this
Section 7 by surrendering for such purpose to Issuer, at its principal office, a
copy of this Agreement or certificates for Option Shares, as applicable,
accompanied by a written notice or notices stating that the Holder or the Owner,
as the case may be, elects to require Issuer to repurchase this Option and/or
the Option Shares in accordance with the provisions of this Section 7. The
Holder shall also represent and warrant that it has sole record and beneficial
ownership of such Option Shares and that such Option Shares are then free and
clear of all liens. As promptly as practicable, and in any event within five (5)
business days after the surrender of the Option and/or certificates representing
Option Shares and the receipt of such notice or notices relating thereto, Issuer
shall deliver or cause to be delivered to the Holder the Option Repurchase Price
and/or to the Owner the Option Share Repurchase Price therefor or the portion
thereof that Issuer is not then prohibited under applicable law and regulation
from so delivering.

     (c) To the extent that Issuer is prohibited under applicable law or
regulation, or as a consequence of administrative policy, from repurchasing the
Option and/or the Option Shares in full, Issuer shall immediately so notify the
Holder and/or the Owner and thereafter deliver or cause to be delivered, from
time to time, to the Holder and/or the Owner, as appropriate, the portion of the
Option Repurchase Price and the Option Share Repurchase Price, respectively,
that


                                      -8-
<PAGE>

it is no longer prohibited from delivering, within five (5) business days after
the date on which Issuer is no longer so prohibited; PROVIDED, HOWEVER, that if
Issuer at any time after delivery of a notice of repurchase pursuant to
paragraph (b) of this Section 7 is prohibited under applicable law or
regulation, or as a consequence of administrative policy, from delivering to the
Holder and/or the Owner, as appropriate, the Option Repurchase Price and the
Option Share Repurchase Price, respectively, in full (and Issuer hereby
undertakes to use its reasonable best efforts to obtain all required regulatory
and legal approvals and to file any required notices as promptly as practicable
in order to accomplish such repurchase), the Holder or Owner may revoke its
notice of repurchase of the Option and/or the Option Shares whether in whole or
to the extent of the prohibition, whereupon, in the latter case, Issuer shall
promptly (i) deliver to the Holder and/or the Owner, as appropriate, that
portion of the Option Repurchase Price and/or the Option Share Repurchase Price
that Issuer is not prohibited from delivering; and (ii) deliver, as appropriate,
either (A) to the Holder, a new Agreement evidencing the right of the Holder to
purchase that number of shares of Common Stock obtained by multiplying the
number of shares of Common Stock for which the surrendered Agreement was
exercisable at the time of delivery of the notice of repurchase by a fraction,
the numerator of which is the Option Repurchase Price less the portion thereof
theretofore delivered to the Holder and the denominator of which is the Option
Repurchase Price, and/or (B) to the Owner, a certificate for the Option Shares
it is then so prohibited from repurchasing. If an Exercise Termination Event
shall have occurred prior to the date of the notice by Issuer described in the
first sentence of this subsection (c), or shall be scheduled to occur at any
time before the expiration of a period ending on the thirtieth day after such
date, the Holder shall nonetheless have the right to exercise the Option until
the expiration of such 30-day period.

     (d) For purposes of this Agreement, a "REPURCHASE EVENT" shall be deemed to
have occurred upon the occurrence of any of the following events or transactions
after the date hereof:

         (i) the acquisition by any person (other than Grantee or any Grantee
     Subsidiary) of (A) beneficial ownership of 50% or more of the then
     outstanding Common Stock or (B) beneficial ownership of 15% more of the
     then outstanding Common Stock if Issuer shall have violated Section 6.16 of
     the Merger Agreement; or

        (ii) the consummation of any Acquisition Transaction described in
     Section 2(b)(i) hereof, except that the percentage referred to in clause
     (z) shall be 25%.

     8. (a) In the event that prior to an Exercise Termination Event, Issuer
shall enter into an agreement (i) to consolidate with or merge into any person,
other than Grantee or a Grantee Subsidiary, or engage in a plan of exchange with
any person, other than Grantee or a Grantee Subsidiary and Issuer shall not be
the continuing or surviving corporation of such consolidation or merger or the
acquirer in such plan of exchange, (ii) to permit any person, other than Grantee
or a Grantee Subsidiary, to merge into Issuer or be acquired by Issuer in a plan
of exchange and Issuer shall be the continuing or surviving or acquiring
corporation, but, in connection with such


                                      -9-
<PAGE>

merger or plan of exchange, the then outstanding shares of Common Stock shall be
changed into or exchanged for stock or other securities of any other person or
cash or any other property or the then outstanding shares of Common Stock shall
after such merger or plan of exchange represent less than 50% of the outstanding
shares and share equivalents of the merged or acquiring company, or (iii) to
sell or otherwise transfer all or a substantial part of its or any Issuer
Subsidiary's assets or deposits to any person, other than Grantee or a Grantee
Subsidiary, then, and in each such case, the agreement governing such
transaction shall make proper provision so that the Option shall, upon the
consummation of any such transaction and upon the terms and conditions set forth
herein, be converted into, or exchanged for, an option (the "SUBSTITUTE
OPTION"), at the election of the Holder, of either (x) the Acquiring Corporation
(as hereinafter defined) or (y) any person that controls the Acquiring
Corporation.

     (b) The following terms have the meanings indicated:

         (i) "ACQUIRING CORPORATION" shall mean (i) the continuing or surviving
     person of a consolidation or merger with Issuer (if other than Issuer),
     (ii) the acquiring person in a plan of exchange in which Issuer is
     acquired, (iii) the Issuer in a merger or plan of exchange in which Issuer
     is the continuing or surviving or acquiring person and (iv) the transferee
     of all or a substantial part of Issuer's assets or deposits (or the assets
     or deposits of any Issuer Subsidiary).

        (ii) "SUBSTITUTE COMMON STOCK" shall mean the common stock issued by the
     issuer of the Substitute Option upon exercise of the Substitute Option.

       (iii) "ASSIGNED VALUE" shall mean the market/offer price, as defined in
     Section 7.

        (iv) "AVERAGE PRICE" shall mean the average closing price of a share of
     the Substitute Common Stock for one (1) year immediately preceding the
     consolidation, merger or sale in question, but in no event higher than the
     closing price of the shares of Substitute Common Stock on the day preceding
     such consolidation, merger or sale; PROVIDED that if Issuer is the issuer
     of the Substitute Option, the Average Price shall be computed with respect
     to a share of common stock issued by the person merging into Issuer or by
     any company which controls or is controlled by such person, as the Holder
     may elect.

     (c) The Substitute Option shall have the same terms as the Option, PROVIDED
that if the terms of the Substitute Option cannot, for legal reasons, be the
same as the Option, such terms shall be as similar as possible and in no event
less advantageous to the Holder. The issuer of the Substitute Option shall also
enter into an agreement with the then Holder or Holders of the Substitute Option
in substantially the same form as this Agreement (after giving effect for such
purpose to the provisions of Section 9), which agreement shall be applicable to
the Substitute Option.



                                      -10-
<PAGE>

     (d) The Substitute Option shall be exercisable for such number of shares of
Substitute Common Stock as is equal to the Assigned Value multiplied by the
number of shares of Common Stock for which the Option was exercisable
immediately prior to the event described in the first sentence of Section 8(a),
divided by the Average Price. The exercise price of the Substitute Option per
share of Substitute Common Stock shall then be equal to the Option Price
multiplied by a fraction, the numerator of which shall be the number of shares
of Common Stock for which the Option was exercisable immediately prior to the
event described in the first sentence of Section 8(a) and the denominator of
which shall be the number of shares of Substitute Common Stock for which the
Substitute Option is exercisable.

     (e) In no event, pursuant to any of the foregoing paragraphs, shall the
Substitute Option be exercisable for more than 19.9% of the shares of Substitute
Common Stock outstanding prior to exercise of the Substitute Option. In the
event that the Substitute Option would be exercisable for more than 19.9% of the
shares of Substitute Common Stock outstanding prior to exercise but for this
clause (e), the issuer of the Substitute Option (the "SUBSTITUTE OPTION ISSUER")
shall make a cash payment to Holder equal to the excess of (i) the value of the
Substitute Option without giving effect to the limitation in this clause (e)
over (ii) the value of the Substitute Option after giving effect to the
limitation in this clause (e). This difference in value shall be determined by a
nationally recognized investment banking firm selected by the Holder.

     (f) Issuer shall not enter into any transaction described in subsection (a)
of this Section 8 unless the Acquiring Corporation and any person that controls
the Acquiring Corporation assume in writing all the obligations of Issuer
hereunder.

     9. (a) At the request of the holder of the Substitute Option (the
"SUBSTITUTE OPTION HOLDER"), the issuer of the Substitute Option (the
"SUBSTITUTE OPTION ISSUER") shall repurchase the Substitute Option from the
Substitute Option Holder at a price (the "SUBSTITUTE OPTION REPURCHASE PRICE")
equal to the amount by which (i) the Highest Closing Price (as hereinafter
defined) exceeds (ii) the exercise price of the Substitute Option, multiplied by
the number of shares of Substitute Common Stock for which the Substitute Option
may then be exercised, and at the request of the owner (the "SUBSTITUTE SHARE
OWNER") of shares of Substitute Common Stock (the "SUBSTITUTE SHARES"), the
Substitute Option Issuer shall repurchase the Substitute Shares at a price (the
"SUBSTITUTE SHARE REPURCHASE PRICE") equal to the Highest Closing Price
multiplied by the number of Substitute Shares so designated. The term "HIGHEST
CLOSING PRICE" shall mean the highest closing price for shares of Substitute
Common Stock within the six-month period immediately preceding the date the
Substitute Option Holder gives notice of the required repurchase of the
Substitute Option or the Substitute Share Owner gives notice of the required
repurchase of the Substitute Shares, as applicable.

     (b) The Substitute Option Holder and the Substitute Share Owner, as the
case may be, may exercise its respective rights to require the Substitute Option
Issuer to repurchase the Substitute Option and the Substitute Shares pursuant to
this Section 9 by surrendering for such purpose to


                                      -11-
<PAGE>

the Substitute Option Issuer, at its principal office, the agreement for such
Substitute Option (or, in the absence of such an agreement, a copy of this
Agreement) and/or certificates for Substitute Shares accompanied by a written
notice or notices stating that the Substitute Option Holder or the Substitute
Share Owner, as the case may be, elects to require the Substitute Option Issuer
to repurchase the Substitute Option and/or the Substitute Shares in accordance
with the provisions of this Section 9. As promptly as practicable and in any
event within five (5) business days after the surrender of the Substitute Option
and/or certificates representing Substitute Shares and the receipt of such
notice or notices relating thereto, the Substitute Option Issuer shall deliver
or cause to be delivered to the Substitute Option Holder the Substitute Option
Repurchase Price and/or to the Substitute Share Owner the Substitute Share
Repurchase Price therefor or the portion thereof which the Substitute Option
Issuer is not then prohibited under applicable law and regulation from so
delivering.

     (c) To the extent that the Substitute Option Issuer is prohibited under
applicable law or regulation, or as a consequence of administrative policy, from
repurchasing the Substitute Option and/or the Substitute Shares in part or in
full, the Substitute Option Issuer shall immediately so notify the Substitute
Option Holder and/or the Substitute Share Owner and thereafter deliver or cause
to be delivered, from time to time, to the Substitute Option Holder and/or the
Substitute Share Owner, as appropriate, the portion of the Substitute Option
Repurchase Price and/or the Substitute Share Repurchase Price, respectively,
which it is no longer prohibited from delivering, within five (5) business days
after the date on which the Substitute Option Issuer is no longer so prohibited;
PROVIDED, HOWEVER, that if the Substitute Option Issuer is at any time after
delivery of a notice of repurchase pursuant to subsection (b) of this Section 9
prohibited under applicable law or regulation, or as a consequence of
administrative policy, from delivering to the Substitute Option Holder and/or
the Substitute Share Owner, as appropriate, the Substitute Option Repurchase
Price and the Substitute Share Repurchase Price, respectively, in full (and the
Substitute Option Issuer shall use its reasonable best efforts to receive all
required regulatory and legal approvals as promptly as practicable in order to
accomplish such repurchase), the Substitute Option Holder and/or Substitute
Share Owner may revoke its notice of repurchase of the Substitute Option or the
Substitute Shares either in whole or to the extent of prohibition, whereupon, in
the latter case, the Substitute Option Issuer shall promptly (i) deliver to the
Substitute Option Holder or Substitute Share Owner, as appropriate, that portion
of the Substitute Option Repurchase Price or the Substitute Share Repurchase
Price that the Substitute Option Issuer is not prohibited from delivering; and
(ii) deliver, as appropriate, either (A) to the Substitute Option Holder, a new
Substitute Option evidencing the right of the Substitute Option Holder to
purchase that number of shares of the Substitute Common Stock obtained by
multiplying the number of shares of the Substitute Common Stock for which the
surrendered Substitute Option was exercisable at the time of delivery of the
notice of repurchase by a fraction, the numerator of which is the Substitute
Option Repurchase Price less the portion thereof theretofore delivered to the
Substitute Option Holder and the denominator of which is the Substitute Option
Repurchase Price, and/or (B) to the Substitute Share Owner, a certificate for
the Substitute Option Shares it is then so prohibited from repurchasing. If an
Exercise


                                      -12-
<PAGE>

Termination Event shall have occurred prior to the date of the notice by the
Substitute Option Issuer described in the first sentence of this subsection (c),
or shall be scheduled to occur at any time before the expiration of a period
ending on the thirtieth day after such date, the Substitute Option Holder shall
nevertheless have the right to exercise the Substitute Option until the
expiration of such 30-day period.

     10. The periods for exercise of certain rights under Sections 2, 6, 7, 9
and 14 shall be extended: (i) to the extent necessary to obtain all regulatory
approvals for the exercise of such rights (for so long as the Holder, Owner,
Substitute Option Holder or Substitute Share Owner, as the case may be, is using
commercially reasonable efforts to obtain such regulatory approvals), and for
the expiration of all statutory waiting periods; (ii) to the extent necessary to
avoid liability under Section 16(b) of the 1934 Act by reason of such exercise;
and (iii) when there exists an injunction, order or judgment that prohibits or
delays exercise of such right.

     11. (a) Issuer hereby represents and warrants to Grantee as follows:

     (i) Issuer has the requisite corporate power and authority to execute and
deliver this Agreement and to consummate the transactions contemplated hereby.
The execution and delivery of this Agreement and the consummation of the
transactions contemplated hereby have been duly and validly authorized by the
Issuer Board prior to the date hereof and no other corporate proceedings on the
part of Issuer are necessary to authorize this Agreement or to consummate the
transactions so contemplated. This Agreement has been duly and validly executed
and delivered by Issuer.

     (ii) Issuer has taken all necessary corporate action to authorize and
reserve and to permit it to issue, and at all times from the date hereof through
the termination of this Agreement in accordance with its terms will have
reserved for issuance upon the exercise of the Option, that number of shares of
Common Stock equal to the maximum number of shares of Common Stock at any time
and from time to time issuable hereunder, and all such shares, upon issuance
pursuant thereto, will be duly authorized, validly issued, fully paid,
nonassessable, and will be delivered free and clear of all claims, liens,
encumbrance and security interests and not subject to any preemptive rights.

     (b) Grantee hereby represents and warrants to Issuer as follows: Grantee
has the requisite corporate power and authority to execute and deliver this
Agreement and to perform its obligations hereunder. The execution and delivery
of this Agreement by the Grantee and the performance of its obligations
hereunder by the Grantee have been duly and validly authorized by the Board of
Directors of Grantee and no other corporate proceedings on the part of the
Grantee are necessary to authorize this Agreement or for Grantee to perform its
obligations hereunder. This Agreement has been duly and validly executed and
delivered by Grantee.



                                      -13-
<PAGE>

     (c) This Option is not being, and any Option Shares or other securities
acquired by Grantee upon exercise of the Option will not be, acquired with a
view to the public distribution thereof and will not be transferred or otherwise
disposed or except in a transaction registered or exempt from registration under
the 1933 Act.

     12. Neither of the parties hereto may assign any of its rights or
obligations under this Agreement or the Option created hereunder to any other
person, without the express written consent of the other party, except that in
the event an Initial Triggering Event shall have occurred prior to an Exercise
Termination Event, Grantee, subject to the express provisions hereof, may assign
in whole or in part its rights and obligations hereunder; PROVIDED, HOWEVER,
that until the date fifteen (15) days following the date on which the Federal
Reserve Board has approved an application by Grantee to acquire the shares of
Common Stock subject to the Option, Grantee may not assign its rights under the
Option except in (i) a widely dispersed public distribution, (ii) a private
placement in which no one party acquires the right to purchase in excess of 2%
of the voting shares of Issuer, (iii) an assignment to a single party (E.G., a
broker or investment banker) for the purpose of conducting a widely dispersed
public distribution on Grantee's behalf or (iv) any other manner approved by the
Federal Reserve Board.

     13. Each of Grantee and Issuer will use its reasonable best efforts to make
all filings with, and to obtain consents of, all third parties and governmental
authorities necessary to the consummation of the transactions contemplated by
this Agreement, including, without limitation, applying to the Federal Reserve
Board under the BHCA for approval to acquire the shares issuable hereunder, but
Grantee shall not be obligated to apply to state banking authorities for
approval to acquire the shares of Common Stock issuable hereunder until such
time, if ever, as it deems appropriate to do so.

     14. (a) Grantee may, at any time following a Repurchase Event and prior to
the occurrence of an Exercise Termination Event (or such later period as
provided in Section 10), relinquish the Option (together with any Option Shares
issued to and then owned by Grantee) to Issuer in exchange for a cash fee equal
to the Surrender Price. The "SURRENDER PRICE" shall be equal to $[160] million
(i) plus, if applicable, Grantee's purchase price with respect to any Option
Shares and (ii) minus, if applicable, the excess of (A) the net price, if any,
received by Grantee or a Grantee Subsidiary pursuant to the sale of Option
Shares (or any other securities into which such Option Shares were converted or
exchanged) to any unaffiliated party, over (B) Grantee's purchase price of such
Option Shares.

     (b) Grantee may exercise its right to relinquish the Option and any Option
Shares pursuant to this Section 14 by surrendering to Issuer, at its principal
office, a copy of this Agreement together with certificates for Option Shares,
if any, accompanied by a written notice stating (i) that Grantee elects to
relinquish the Option and Option Shares, if any, in accordance with the
provisions of this Section 14 and (ii) the Surrender Price. The Surrender Price
shall be payable


                                      -14-
<PAGE>

in immediately available funds on or before the second business day following
receipt of such notice by Issuer.

     (c) To the extent that Issuer is prohibited under applicable law or
regulation, or as a consequence of administrative policy, from paying the
Surrender Price to Grantee in full, Issuer shall immediately so notify Grantee
and thereafter deliver or cause to be delivered, from time to time, to Grantee,
the portion of the Surrender Price that it is no longer prohibited from paying,
within five (5) business days after the date on which Issuer is no longer so
prohibited; PROVIDED, HOWEVER, that if Issuer at any time after delivery of a
notice of surrender pursuant to paragraph (b) of this Section 14 is prohibited
under applicable law or regulation, or as a consequence of administrative
policy, from paying to Grantee the Surrender Price in full, (i) Issuer shall (A)
use its reasonable best efforts to obtain all required regulatory and legal
approvals and to file any required notices as promptly as practicable in order
to make such payments, (B) within five (5) days of the submission or receipt of
any documents relating to any such regulatory and legal approvals, provide
Grantee with copies of the same and (c) keep Grantee advised of both the status
of any such request for regulatory and legal approvals, as well as any
discussions with any relevant regulatory or other third party reasonably related
to the same and (ii) Grantee may revoke such notice of surrender by delivery of
a notice of revocation to Issuer and, upon delivery of such notice of
revocation, the Exercise Termination Date shall be extended to a date six (6)
months from the date on which the Exercise Termination Date would have occurred
if not for the provisions of this Section 14(c) (during which period Grantee may
exercise any of its rights hereunder, including any and all rights pursuant to
this Section 14).

     15. The parties hereto acknowledge that damages would be an inadequate
remedy for a breach of this Agreement by either party hereto and that the
obligations of the parties hereto shall be enforceable by either party hereto
through injunctive or other equitable relief. In connection therewith, both
parties waive the posting of any bond or similar requirement.

     16. If any term, provision, covenant or restriction contained in this
Agreement is held by a court or a federal or state regulatory agency of
competent jurisdiction to be invalid, void or unenforceable, the remainder of
the terms, provisions and covenants and restrictions contained in this Agreement
shall remain in full force and effect, and shall in no way be affected, impaired
or invalidated. If for any reason such court or regulatory agency determines
that the Holder is not permitted to acquire, or Issuer is not permitted to
repurchase pursuant to Section 7, the full number of shares of Common Stock
provided in Section l(a) hereof (as adjusted pursuant to Section l(b) or Section
5 hereof), it is the express intention of Issuer to allow the Holder to acquire
or to require Issuer to repurchase such lesser number of shares as may be
permissible, without any amendment or modification hereof.

     17. All notices, requests, claims, demands and other communications
hereunder shall be deemed to have been duly given when delivered in person, by
fax, telecopy, or by registered or


                                      -15-
<PAGE>

certified mail (postage prepaid, return receipt requested) at the respective
addresses of the parties set forth in the Merger Agreement.

     18. This Agreement shall be governed by and construed in accordance with
the laws of the State of Utah, without regard to the conflict of law principles
thereof (except to the extent that mandatory provisions of Federal law are
applicable).

     19. This Agreement may be executed in two or more counterparts, each of
which shall be deemed to be an original, but all of which shall constitute one
and the same agreement.

     20. Except as otherwise expressly provided herein, each of the parties
hereto shall bear and pay all costs and expenses incurred by it or on its behalf
in connection with the transactions contemplated hereunder, including fees and
expenses of its own financial consultants, investment bankers, accountants and
counsel.

     21. Except as otherwise expressly provided herein or in the Merger
Agreement, this Agreement contains the entire agreement between the parties with
respect to the transactions contemplated hereunder and supersedes all prior
arrangements or understandings with respect thereof, written or oral. The terms
and conditions of this Agreement shall inure to the benefit of and be binding
upon the parties hereto and their respective successors and permitted assignees.
Nothing in this Agreement, expressed or implied, is intended to confer upon any
party, other than the parties hereto, and their respective successors except as
assignees, any rights, remedies, obligations or liabilities under or by reason
of this Agreement, except as expressly provided herein.

     22. Capitalized terms used in this Agreement and not defined herein shall
have the meanings assigned thereto in the Merger Agreement.


                                      -16-
<PAGE>

     IN WITNESS WHEREOF, each of the parties has caused this Agreement to be
executed on its behalf by its officers thereunto duly authorized, all as of the
date first above written.


                                         ZIONS BANCORPORATION


                                         By /s/ Harris H. Simmons
                                            ------------------------------------
                                             Name:  Harris H. Simmons
                                             Title: President and Chief
                                                    Executive Officer



                                          FIRST SECURITY CORPORATION


                                          By /s/ S.F. Eccles
                                            ------------------------------------
                                             Name:  Spencer F. Eccles
                                             Title: Chairman of the Board and
                                                    Chief Executive Officer


                                      -16-


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