ELEVENTH AUTOMATIC COMMON EXCHANGE SECURITY TRUST
N-2/A, EX-99.2.K.IV, 2000-10-30
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<PAGE>   1
                                                                Exhibit 2.k.(iv)




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




                              COLLATERAL AGREEMENT


                                      Among

                                   NYLIFE LLC
                                   As Pledgor,



                            THE CHASE MANHATTAN BANK,
                               As Collateral Agent


                                       and



                EXPRESS SCRIPTS AUTOMATIC EXCHANGE SECURITY TRUST


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


                         Dated as of November   , 2000


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



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




<PAGE>   2



                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                    ARTICLE I

                           DEFINITIONS; INTERPRETATION

<S>          <C>                                                                   <C>
Section 1.1.  Defined Terms...........................................................1
Section 1.2.  Interpretation..........................................................7

                                   ARTICLE II

                             THE SECURITY INTERESTS

Section 2.1.  Grant of Security Interests.............................................7

                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

Section 3.1.  Representations and Warranties of Pledgor...............................9
Section 3.2.  Representations and Warranties of the Collateral Agent..................9

                                   ARTICLE IV

                          CERTAIN COVENANTS OF PLEDGOR

Section 4.1.  Certain Covenants of Pledgor...........................................10

                                    ARTICLE V

                      ADMINISTRATION OF THE COLLATERAL AND
                           VALUATION OF THE SECURITIES

Section 5.1.  Valuation of Collateral................................................11
Section 5.2.  Substitution of Collateral.............................................11
Section 5.3.  Additional Collateral..................................................12
Section 5.4.  Delivery of Collateral.................................................13
Section 5.5.  Insufficiency Determination............................................14
Section 5.6.  Release of Excess Collateral...........................................15
Section 5.7.  Delivery of Contract Consideration.....................................15
Section 5.8.  Investment of Cash Collateral..........................................16
</TABLE>


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<TABLE>
<CAPTION>
                                   ARTICLE VI

                     INCOME AND VOTING RIGHTS ON COLLATERAL

<S>          <C>                                                                  <C>
Section 6.1.  Income on Collateral...................................................16
Section 6.2.  Voting of Collateral...................................................16

                                   ARTICLE VII

                         REMEDIES UPON EVENTS OF DEFAULT

Section 7.1.  Rights of Secured Party................................................17
Section 7.2.  Power of Attorney......................................................18
Section 7.3.  Application of Collateral and Proceeds.................................18

                                  ARTICLE VIII

                              THE COLLATERAL AGENT

Section 8.1.  Conditions to Duties of the Collateral Agent...........................19
Section 8.2.  Merger.................................................................21
Section 8.3.  Resignation............................................................21
Section 8.4.  Removal................................................................22
Section 8.5.  Effectiveness of Resignation or Removal................................22
Section 8.6.  Appointment of Successor...............................................22
Section 8.7.  Acceptance by Successor................................................22
Section 8.8.  Compensation...........................................................23
Section 8.9.  Indemnification........................................................23

                                   ARTICLE IX

                                  MISCELLANEOUS

Section 9.1.  Termination............................................................23
Section 9.2.  No Assumption of Liability.............................................24
Section 9.3.  Notices................................................................24
Section 9.4.  Governing Law; Severability............................................24
Section 9.5.  Entire Agreement.......................................................24
Section 9.6.  Amendments; Waivers....................................................25
Section 9.7.  Non-Assignability......................................................25
Section 9.8.  No Third Party Rights; Successors and Assigns..........................25
Section 9.9.  Counterparts...........................................................25
</TABLE>


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EXHIBITS

Exhibit A - Notice of Pledge Value
Exhibit B - Certificate for Substituted Collateral
Exhibit C - Certificate for Additional Collateral

                                      -iii-



<PAGE>   5



                              COLLATERAL AGREEMENT

        COLLATERAL AGREEMENT, dated as of November ____, 2000, among NYLIFE LLC,
a limited liability company organized under the laws of the State of Delaware
("Pledgor"), The Chase Manhattan Bank, a New York banking corporation, as
collateral agent hereunder for the benefit of Express Scripts Automatic Exchange
Security Trust, a trust organized under the laws of the State of New York under
and by virtue of an Amended and Restated Trust Agreement, dated as of November
__ , 2000 (such trust and the trustees thereof acting in their capacity as such
being referred to in this Agreement as "Purchaser"), and Purchaser.

                              W I T N E S S E T H:

        WHEREAS, pursuant to the Purchase Agreement, dated as of November __ ,
2000 (the "Contract"), between Pledgor and Purchaser, Pledgor has agreed to sell
and Purchaser has agreed to purchase shares of Class A Common Stock, par value
$0.01 per share (the "Class A Common Stock"), of Express Scripts, Inc., a
Delaware corporation (the "Company"), subject to the terms and conditions of the
Contract;

        NOW, THEREFORE, to secure the performance by Pledgor of its obligations
under the Contract and to secure the observance and performance of the covenants
and agreements contained in this Agreement and in the Contract, the parties,
intending to be bound, agree as follows:

                                    ARTICLE I

                           DEFINITIONS; INTERPRETATION

        Section 1.1.  Defined Terms. As used in this Agreement, the following
terms have the following meanings:

              "Accelerated Portion" has the meaning specified in the Contract.

              "Additional Purchase Price" has the meaning specified in the
        Contract.

              "Additional Share Base Amount" has the meaning specified in the
        Contract.

              "Agreement" means this Collateral Agreement.

              "Authorized Representative" of Pledgor means any trustee or other
        representative as to whom Pledgor shall have delivered notice to the
        Collateral




<PAGE>   6



        Agent that such trustee or other representative is authorized to act
        hereunder on behalf of Pledgor.

              "Cash Delivery Obligations" means, at any time (A) if no
        Reorganization Event shall have occurred prior to such time, zero, and
        (B) from and after any Reorganization Event, the Dilution Adjustment (or
        successive Dilution Adjustments) that shall have been applied to the
        Exchange Rate pursuant to Section 6.1 of the Contract at or prior to the
        Reorganization Event, times the product of: (i) the Firm Share Base
        Amount plus the Additional Share Base Amount (if any) and (ii) the
        Transaction Value (as defined in the Contract) of any Merger
        Consideration other than Marketable Securities delivered in the related
        Reorganization Event, provided that if the Reorganization Event is a
        Cash Merger, the Cash Delivery Obligations shall again be zero after
        Pledgor has delivered the Accelerated Portion to the Purchaser as
        required under the Purchase Agreement.

              "Cash Merger" has the meaning specified in the Contract.

              "Class A Common Stock" has the meaning specified in the recitals
        to this Agreement.

              "Closing Price" has the meaning specified in the Contract.

              "Collateral" has the meaning specified in Section 2.1(a).

              "Collateral Agent" means The Chase Manhattan Bank, in its capacity
        as collateral agent under this Agreement, or its successor in such
        capacity appointed in accordance with Section 8.5.

              "Collateral Event of Default" means, at any time, the occurrence
        of any of the following: (A) if no U.S. Government Securities shall be
        pledged as substitute Collateral at such time, failure of the aggregate
        Market Value of the Collateral to equal or exceed the Pledge Value
        Requirement; (B) if any U.S. Government Securities shall be pledged as
        substitute Collateral at such time, failure of the Market Value of any
        U.S. Government Securities pledged at such time (not including any U.S.
        Government Securities pledged in respect of Cash Delivery Obligations at
        such time) to have an aggregate Market Value of at least 105% of the
        Market Value of a number of shares of Class A Common Stock and, from and
        after any Spin-Off Distribution, of the Marketable Securities
        distributed in such Spin-Off Distribution (or, from and after any
        Reorganization Event, the Marketable Securities distributed in such
        Reorganization Event in lieu of such shares of Class A Common Stock or
        Marketable Securities) equal in each case to (x) the Maximum Deliverable
        Number of such securities minus (y) the number of

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        such securities pledged as Collateral hereunder at such time; or (C)
        from and after any Reorganization Event in which consideration other
        than Marketable Securities shall have been delivered, failure of the
        U.S. Government Securities pledged in respect of Cash Delivery
        Obligations to have an aggregate Market Value at least equal to 105% of
        the Cash Delivery Obligations at such time, if, in the case of a failure
        described in this clause (C), such failure shall continue to be in
        effect at 4:00 p.m., New York City time, on the next Business Day
        following the day on which telephonic notice in respect of such failure
        shall have been given pursuant to Section 5.5(a).

              "Collateral Requirement" means, as of any date and with respect
        to: (i) any Class A Common Stock, 100%; (ii) any Marketable Securities,
        100%; (iii) any U.S. Government Securities pledged in respect of Cash
        Delivery Obligations, 105%; and (iv) any other U.S. Government
        Securities, 150%, provided that upon and after any failure to cure an
        Insufficiency Determination by 4:00 p.m. New York City time on the next
        Business Day following telephonic notice of such Insufficiency
        Determination as described in Section 5.5(b), which insufficiency shall
        be continuing on such next business day, the Collateral Requirement
        relating to any U.S. Government Securities shall be 200%. The portion of
        any pledged U.S. Government Securities that shall be deemed to be
        pledged in respect of Cash Delivery Obligations at any time shall be a
        portion having a Market Value equal to 105% of the Cash Delivery
        Obligations at such time or, if less, the aggregate Market Value of all
        U.S. Government Securities pledged at such time.

              "Company" has the meaning specified in the recitals to this
        Agreement.

              "Contract" has the meaning specified in the recitals to this
        Agreement.

              "Delivery Date" has the meaning specified in Section 7.1.

              "Dilution Adjustment" has the meaning specified in the Contract.

              "Distribution Date" has the meaning specified in the Trust
        Agreement.

              "Eligible Collateral" means (i) unless and until a Reorganization
        Event shall occur, Class A Common Stock and, if a Spin-Off Distribution
        occurs, the Marketable Securities distributed in such Spin-Off
        Distribution; (ii) U.S. Government Securities, and (iii) from and after
        any Reorganization Event, the Marketable Securities distributed in such
        Reorganization Event; provided, in each case, that Pledgor has good and
        marketable title to such securities, free of all Liens (other than the
        Liens created by this Agreement) and Transfer Restrictions and that the
        Collateral Agent has a valid, first priority perfected security interest
        therein and first lien thereon; and provided further that to the extent
        the number of

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<PAGE>   8



        shares of Class A Common Stock or Marketable Securities pledged
        hereunder exceeds at any time the Maximum Deliverable Number of such
        securities, such excess shares shall not be Eligible Collateral.

              "Event of Default" means the occurrence of: (i) an event described
        in Section 7.1(a) or (b) of the Contract, (ii) a Collateral Event of
        Default, (iii) a failure by Pledgor to have caused the Collateral to
        meet the requirements described in Section 4.1(d) on the Exchange Date,
        or (iv) if a Reorganization Event shall have occurred prior to the
        Exchange Date, failure by Pledgor to cause to be delivered to Purchaser
        on the Exchange Date the consideration then required to be delivered
        pursuant to Section 6.2 of the Contract.

              "Exchange Date" has the meaning specified in the Contract.

              "Exchange Rate" has the meaning specified in the Contract.

              "Firm Purchase Price" has the meaning specified in the Contract.

              "Firm Share Base Amount" has the meaning specified in the
        Contract.

              "First Time of Delivery" has the meaning specified in the
        Contract.

              "Indemnity Agreement" means the Fund Indemnity Agreement, date
        November ____, 2000 among Seller, The Chase Manhattan Bank and
        Purchaser.

              "Insufficiency Determination" has the meaning specified in Section
        5.5(a).

              "Lien" means any lien, mortgage, security interest, pledge,
        charge, encumbrance or adverse claim of any kind.

              "Marketable Securities" has the meaning specified in the Contract.

              "Market Value" means, as of any date: (a) with respect to any
        Class A Common Stock (except as otherwise provided in Section 5.5(b)),
        the Closing Price of the Class A Common Stock on such date multiplied by
        the number of shares of such Class A Common Stock; (b) with respect to
        any U.S. Government Security, the product of (x)(i) the average unit bid
        price for such security as published on the Trading Day prior to such
        date in the New York edition of The Wall Street Journal or The New York
        Times or the average unit bid price set forth on the applicable page of
        the Bloomberg system, or, if not so published, (ii) the lower bid price
        quoted (which quotation shall be evidenced in writing) on the Trading
        Day prior to such date by either of two nationally recognized dealers
        making a market in such security which are members of the National
        Association

                                       -4-



<PAGE>   9



        of Securities Dealers, Inc. and (y) the number of such units comprised
        of the outstanding principal amount of such security; and (c) with
        respect to any Marketable Securities, the Closing Price of such
        Marketable Securities on the Trading Day prior to such date multiplied
        by the number of shares of such Marketable Securities; provided that the
        "Market Value" of any Collateral that does not constitute Eligible
        Collateral shall be zero.

              "Maximum Deliverable Number" means, on any date, (i) with respect
        to the Class A Common Stock, the product of the Firm Share Base Amount
        plus the Additional Share Base Amount (if any), multiplied successively
        by each Dilution Adjustment by which the Exchange Rate shall have been
        multiplied on or prior to such date pursuant to the Dilution Adjustments
        provided for under Section 6.1 of the Contract; and (ii) with respect to
        the Marketable Securities of any class or series, the product of (A) the
        Firm Share Base Amount plus the Additional Share Base Amount (if any)
        multiplied by (B) the number of Marketable Securities included in the
        Merger Consideration in the applicable Reorganization Event or
        distributed in the applicable Spin-Off Distribution for each share of
        Class A Common Stock, multiplied successively by (x) each Dilution
        Adjustment by which the Exchange Rate with respect to the Class A Common
        Stock shall have been multiplied on or prior to the date of such
        Reorganization Event or Spin-Off Distribution pursuant to the
        adjustments provided for under Article VI of the Contract, and (y) each
        Dilution Adjustment by which the Exchange Rate with respect to such
        Marketable Securities shall have been multiplied on or prior to such
        date and after the date of such Reorganization Event or Spin-Off
        Distribution pursuant to the adjustments provided for under Article VI
        of the Contract.

              "Person" means an individual, a corporation, a limited liability
        company, a partnership, an association, a trust or any other entity or
        organization, including a government or political subdivision or an
        agency or instrumentality thereof.

              "Pledge Value" means, as of any date, an amount equal to the sum
        of the aggregate Market Value of each particular type of Collateral, as
        of such date, in each case divided by the Collateral Requirement for
        such type of Collateral.

              "Pledge Value Requirement" means, as of any date, (a) the
        aggregate Market Value on such date of the Maximum Deliverable Number of
        shares of Class A Common Stock on such date or, from and after a
        Reorganization Event, the Maximum Deliverable Number of the Marketable
        Securities included in the Merger Consideration in such Reorganization
        Event plus (b) from and after a Reorganization Event, the Cash Delivery
        Obligations, plus (c) from and after a Spin-Off Distribution, the Market
        Value on such date of the Maximum Deliverable Number of the Marketable
        Securities distributed in such Spin-Off Distribution.

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<PAGE>   10



              "Pledged Items" means, as of any date, any and all securities,
        instruments, cash and other property delivered by Pledgor to be held by
        the Collateral Agent under this Agreement as Collateral, whether or not
        constituting Eligible Collateral and whether or not then required to be
        held by the Collateral Agent hereunder.

              "Pledgor" has the meaning specified in the preamble to this
        Agreement.

              "Prior Collateral" has the meaning specified in Section 5.2(a).

              "Purchaser" has the meaning specified in the preamble to this
        Agreement.

              "Reorganization Event" has the meaning specified in the Contract.

              "Responsible Officer" means, when used with respect to the
        Collateral Agent, any vice president, assistant vice president,
        assistant treasurer or assistant secretary located in the division or
        department of the Collateral Agent responsible for performing the
        obligations of the Collateral Agent under this Agreement.

              "Second Time of Delivery" has the meaning specified in the
        Contract.

              "Spin-off Distribution" has the meaning specified in the Contract.

              "Trading Day" has the meaning specified in the Contract.

              "Transfer Restriction" means, with respect to any item of
        Collateral, any condition to or restriction on the ability of the holder
        of such item to sell, assign or otherwise transfer such item of
        Collateral or to enforce the provisions thereof or of any document
        related thereto whether set forth in such item of Collateral itself or
        in any document related thereto, including (i) any requirement that any
        sale, assignment or other transfer or enforcement of such item of
        Collateral be consented to or approved by any Person, including the
        issuer thereof or any other obligor thereon, (ii) any limitations on the
        type or status, financial or otherwise, of any purchaser, pledgee,
        assignee or transferee of such item of Collateral, (iii) any requirement
        to deliver any certificate, consent, agreement, opinion of counsel,
        notice or any other document of any Person to the issuer of, any other
        obligor on or any registrar or transfer agent for, such item of
        Collateral, prior to the sale, pledge, assignment or other transfer or
        enforcement of such item of Collateral, and (iv) any registration or
        qualification requirement for such item of Collateral pursuant to any
        federal or state securities law that has not been satisfied; provided,
        however, that the required delivery of any assignment from the seller,
        pledgor, assignor or transferor of such item of Collateral, together
        with any evidence of the corporate or other authority of such Person,
        shall not constitute a "Transfer Restriction".

                                       -6-



<PAGE>   11



              "Trustee" or "Trustees" means any trustee or trustees of Purchaser
        named in the Trust Agreement, or any successor as such trustee or
        trustees.

              "UCC" means the Uniform Commercial Code as in effect in the State
        of New York.

              "U.S. Government Securities" means direct obligations of the
        United States of America that mature on a date that is one year or less
        from the date such obligations are pledged hereunder, but in any event
        prior to the Exchange Date then in effect.

        Section 1.2. Interpretation.

              (a)     When a reference is made in this Agreement to Articles,
        Sections, Exhibits or Schedules, such reference is to Articles or
        Sections of, or Exhibits or Schedules to, this Agreement unless
        otherwise indicated.

              (b)     The table of contents and headings contained in this
        Agreement are for reference purposes only and are not part of this
        Agreement, and shall not be deemed to limit or otherwise affect any of
        the provisions of this Agreement.

              (c)     Whenever the words "include", "includes" or "including"
        are used in this Agreement, they shall be deemed to be followed by the
        words "without limitation".

              (d)     Any reference to any statute, regulation or agreement is a
        reference to such statute, regulation or agreement as supplemented or
        amended from time to time.

                                   ARTICLE II

                             THE SECURITY INTERESTS

        Section 2.1. Grant of Security Interests. Effective upon and subject to
the receipt by Pledgor of the Firm Purchase Price at the First Time of Delivery
(except as provided in Section 2.1(c)), in order to secure the performance by
Pledgor of its obligations under the Contract and to secure the observance and
performance of the covenants and agreements contained in this Agreement and in
the Contract:

              (a)     Security Interests. Pledgor hereby grants, sells, conveys,
        assigns, transfers and pledges to the Collateral Agent, as agent of and
        for the benefit of Purchaser, a security interest in and to, and a lien
        upon and right of set-off against, all of its right, title and interest
        in, to and under (i) the Pledged Items described in

                                       -7-



<PAGE>   12



        paragraphs (b) and (c); (ii) all additions to and substitutions for such
        Pledged Items; (iii) all income, products and proceeds and collections
        received or to be received, or derived or to be derived, now or any time
        hereafter from or in connection with the Pledged Items; and (iv) all
        powers and rights now owned or hereafter acquired under or with respect
        to the Pledged Items (such Pledged Items, additions, substitutions,
        income, products and proceeds, collections, powers and rights being
        collectively called the "Collateral"). The Collateral Agent shall have
        all of the rights, remedies and recourses with respect to the Collateral
        afforded a secured party by the UCC, in addition to, and not in
        limitation of, the other rights, remedies and recourses afforded to the
        Collateral Agent by this Agreement.

              (b)     First Time of Delivery. Effective upon and subject to
        receipt by Pledgor of the Firm Purchase Price, at the First Time of
        Delivery, Pledgor shall either (1) deliver to the Collateral Agent in
        pledge hereunder one or more certificates representing in the aggregate
        at least _____ shares of Class A Common Stock, registered in the name of
        the Collateral Agent or its nominee or duly endorsed in blank or
        accompanied by undated stock powers duly endorsed in blank, or (2) if
        such shares of Class A Common Stock are not held in certificated form
        but are held in book-entry form by The Depository Trust Company or any
        other comparable depositary, transfer such shares of Class A Common
        Stock to an account of the Collateral Agent or to an account (other than
        an account of Pledgor) designated by the Collateral Agent with The
        Depository Trust Company or such other depositary, as applicable.

              (c)     Second Time of Delivery. Effective upon and subject to the
        receipt by Pledgor of the Additional Purchase Price at the Second Time
        of Delivery, Pledgor shall either (1) deliver to the Collateral Agent in
        pledge hereunder one or more certificates representing in the aggregate
        at least the Additional Share Base Amount of Class A Common Stock,
        registered in the name of the Collateral Agent or its nominee or duly
        endorsed in blank or accompanied by undated stock powers duly endorsed
        in blank, or (2) if such shares of Class A Common Stock are not held in
        certificated form but is held in book-entry form by The Depository Trust
        Company or any other comparable depositary, transfer such shares of
        Class A Common Stock to an account of the Collateral Agent or to an
        account (other than an account of Pledgor) designated by the Collateral
        Agent with The Depository Trust Company or such other depositary, as
        applicable.

                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

        Section 3.1. Representations and Warranties of Pledgor. Pledgor hereby
represents and warrants to the Collateral Agent and Purchaser that:

                                       -8-



<PAGE>   13



              (a)     No Transfer Restrictions. No Transfer Restrictions exist
        with respect to or otherwise apply to the pledge or assignment of, or
        transfer by Pledgor of, any items of Collateral to the Collateral Agent
        hereunder, or the subsequent sale or transfer of such items of
        Collateral by the Collateral Agent pursuant to the terms of this
        Agreement.

              (b)     Title to Collateral; Perfected Security Interest. At the
        First Time of Delivery, Pledgor will have good and marketable title to
        the Pledged Items, free of all Liens (other than the Lien created by
        this Agreement) and Transfer Restrictions. Upon delivery of the Pledged
        Items pursuant to Sections 2.1(b) and (c), the Collateral Agent will
        obtain a valid, first priority perfected security interest in, and a
        first lien upon, such Pledged Items subject to no other Lien. None of
        the Collateral is or shall be pledged by Pledgor as collateral for any
        other purpose.

        Section 3.2. Representations and Warranties of the Collateral Agent. The
Collateral Agent represents and warrants to Pledgor and Purchaser that:

              (a)     Corporate Existence and Power. The Collateral Agent is a
        banking corporation, duly incorporated, validly existing and in good
        standing under the laws of the jurisdiction of its incorporation, and
        has all corporate powers and all governmental licenses, authorizations,
        consents and approvals required to enter into, and perform its
        obligations under, this Agreement.

              (b)     Authorization and Non-Contravention. The execution,
        delivery and performance by the Collateral Agent of this Collateral
        Agreement have been duly authorized by all necessary corporate action on
        the part of the Collateral Agent (no action by the shareholders of the
        Collateral Agent being required) and do not and will not violate,
        contravene or constitute a default under any provision of applicable law
        or regulation or of the charter or by-laws of the Collateral Agent or of
        any material agreement, judgment, injunction, order, decree or other
        instrument binding upon the Collateral Agent.

              (c)     Binding Effect. This Agreement constitutes a valid and
        binding agreement of the Collateral Agent enforceable against the
        Collateral Agent in accordance with its terms.

                                       -9-



<PAGE>   14



                                   ARTICLE IV

                          CERTAIN COVENANTS OF PLEDGOR

        Section 4.1. Certain Covenants of Pledgor. Pledgor agrees that, so long
as any of its obligations under the Contract remain outstanding:

              (a)     Title to Collateral. Pledgor shall at all times hereafter
        have and maintain good and marketable title to the Collateral pledged by
        it, free of all Liens (other than the Lien created by this Agreement)
        and Transfer Restrictions, and, subject to the terms of this Agreement,
        will at all times hereafter have and maintain good, right and lawful
        authority to assign, transfer and pledge such Collateral and all such
        additions to such Collateral and substitutions for such Collateral under
        this Agreement.

              (b)     Pledge Value Requirement. Pledgor shall cause the
        aggregate Pledge Value of the Collateral to be equal to or greater than
        the Pledge Value Requirement at all times, and shall pledge additional
        Collateral in the manner described in Section 5.4 as necessary to cause
        such requirement to be met.

              (c)     Pledge Upon Reorganization Event. Upon the occurrence of a
        Reorganization Event, Pledgor shall immediately cause to be delivered to
        the Collateral Agent, in the manner provided in Section 5.4: (i) cash in
        an amount equal to 100% of Pledgor's Cash Delivery Obligations (or U.S.
        Government Securities having an aggregate Market Value when pledged and
        at daily mark-to-market valuations thereafter at least equal to 105% of
        the Cash Delivery Obligations); and (ii) Marketable Securities in an
        amount at least equal to the Maximum Deliverable Number of such
        securities, or, at Pledgor's election, U.S. Government Securities having
        an aggregate Market Value when pledged and at daily mark-to-market
        valuations thereafter at least equal to 150% of such Maximum Deliverable
        Number of Marketable Securities, in each case to be held as substitute
        Collateral hereunder.

              (d)     Pledge Upon Spin-Off Distribution. Upon the occurrence of
        a Spin-Off Distribution, Pledgor shall immediately cause to be delivered
        to the Collateral Agent, in the manner provided in Section 5.4,
        Marketable Securities in an amount at least equal to the Maximum
        Deliverable Number of such securities, or, at Pledgor's election, U.S.
        Government Securities having an aggregate Market Value at least equal to
        150% of such Maximum Deliverable Number of Marketable Securities, in
        each case to be held as additional Collateral hereunder.

              (e)     Pledge of Contract Consideration. Notwithstanding
        Pledgor's right to substitute Collateral pursuant to Section 5.2,
        Pledgor shall cause the

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<PAGE>   15



        Collateral to include, on the Exchange Date, (i) unless a Reorganization
        Event shall have occurred, a number of shares of Class A Common Stock at
        least equal to the number of shares of Class A Common Stock (and, if a
        Spin-Off Distribution has occurred, the number of shares of Marketable
        Securities distributed in such Spin-Off Distribution) required to be
        delivered under the Contract on the Exchange Date, and (ii) if a
        Reorganization Event has occurred, any Marketable Securities or other
        property required to be delivered under the Contract on the Exchange
        Date.

              (f)     Further Assurances. Pledgor shall, at its expense and in
        such manner and form as Purchaser or the Collateral Agent may reasonably
        require, give, execute, deliver, file and record any financing
        statement, notice, instrument, document, agreement or other papers that
        may be necessary or desirable in order to create, preserve, perfect,
        substantiate or validate any security interest granted pursuant to this
        Agreement or to enable the Collateral Agent to exercise and enforce its
        rights and the rights of Purchaser hereunder with respect to such
        security interest. To the extent permitted by applicable law, Pledgor
        hereby authorizes the Collateral Agent to execute and file, in the name
        of Pledgor or otherwise, UCC financing or continuation statements (which
        may be carbon, photographic, photostatic or other reproductions of this
        Agreement or of a financing statement relating to this Agreement) which
        the Collateral Agent may reasonably deem necessary or appropriate to
        further perfect, or maintain the perfection of, the security interests
        granted hereby.

                                    ARTICLE V

                      ADMINISTRATION OF THE COLLATERAL AND
                           VALUATION OF THE SECURITIES

        Section 5.1. Valuation of Collateral. The Collateral Agent shall
determine as of 4:00 p.m., New York City time, on each Business Day whether the
Pledge Value is at least equal to the Pledge Value Requirement and whether an
Insufficiency Determination or Collateral Event of Default shall have occurred
and, from and after any Reorganization Event, Spin-Off Distribution or
substitution of U.S. Government Securities for pledged shares of Class A Common
Stock or Marketable Securities pursuant to Section 5.2, shall determine the
Pledge Value and the Pledge Value Requirement on each Business Day and shall
provide written notice of the Pledge Value and the Pledge Value Requirement, in
the form of Exhibit A, to Pledgor.

        Section 5.2. Substitution of Collateral. Pledgor may substitute
Collateral in accordance with the following provisions:

                                      -11-



<PAGE>   16



              (a)     Unless an Event of Default or a failure by Pledgor to meet
        any of its obligations under Article IV or V has occurred and is
        continuing, Pledgor shall have the right at any time and from time to
        time to deposit Eligible Collateral with the Collateral Agent in
        substitution for Pledged Items previously deposited hereunder ("Prior
        Collateral") and to obtain the release of such Prior Collateral from the
        Lien created by this Agreement.

              (b)     If Pledgor wishes to deposit Eligible Collateral with the
        Collateral Agent in substitution for Prior Collateral, it shall (i) give
        written notice from an Authorized Representative to the Collateral Agent
        identifying the Prior Collateral to be released from the Lien created by
        this Agreement, (ii) deliver to the Collateral Agent concurrently with
        such Eligible Collateral a certificate of Pledgor substantially in the
        form of Exhibit B and dated the date of such delivery, (A) identifying
        the items of Eligible Collateral being substituted for the Prior
        Collateral and the Prior Collateral that is to be transferred to Pledgor
        and (B) certifying that with respect to such items of additional Pledged
        Collateral the representations and warranties contained in Exhibit B are
        true and correct on and as of the date of such certificate, and (iii)
        deliver to the Collateral Agent concurrently with such Eligible
        Collateral an opinion, dated the date of such delivery, of counsel
        addressed to the Collateral Agent confirming the representations
        contained in the second sentence of paragraph 3(b) of Exhibit B. Pledgor
        hereby covenants and agrees to take all actions required under Section
        5.4 and any other actions necessary to create for the benefit of the
        Collateral Agent a valid, first priority perfected security interest in,
        and a first lien upon, such Eligible Collateral deposited with the
        Collateral Agent in substitution for Prior Collateral.

              (c)     No such substitution shall be made unless and until the
        Collateral Agent shall have determined that the aggregate Pledge Value
        of all of the Collateral at the time of such proposed substitution,
        after giving effect to the proposed substitution, shall at least equal
        the Pledge Value Requirement.

        Section 5.3. Additional Collateral. Pledgor may pledge additional
Collateral hereunder at any time and shall pledge additional collateral when
required under this Agreement. Concurrently with the delivery of any additional
Eligible Collateral, Pledgor shall deliver (i) a certificate of Pledgor
substantially in the form of Exhibit C, signed by an Authorized Representative,
and dated the date of such delivery, (A) identifying the items of additional
Eligible Collateral being pledged and (B) certifying that with respect to such
items of additional Pledged Collateral the representations and warranties
contained in Exhibit C are true and correct on and as of the date of such
certificate, and (ii) an opinion, dated the date of such delivery, of counsel
addressed to the Collateral Agent confirming the representations contained in
the second sentence of paragraph 2(b) of Exhibit C. Pledgor hereby covenants and
agrees to take all actions required under

                                      -12-



<PAGE>   17



Section 5.4 and any other actions necessary to create for the benefit of the
Collateral Agent a valid, first priority perfected security interest in, and a
first lien upon, such additional Eligible Collateral.

        Section 5.4. Delivery of Collateral. Pledgor shall deliver the
Collateral to the Collateral Agent in accordance with the following provisions:

              (a)     Pledged Class A Common Stock. In the case of Collateral
        consisting of shares of Class A Common Stock, by either (1) delivery to
        the Collateral Agent of one or more certificates representing such
        shares of Class A Common Stock, registered in the name of the Collateral
        Agent or its nominee or duly endorsed in blank or accompanied by undated
        stock powers duly endorsed in blank, or (2) if such shares of Class A
        Common Stock are not held in certificated form but is held in book-entry
        form by The Depository Trust Company or any other comparable depositary,
        transfer of such shares of Class A Common Stock to an account of the
        Collateral Agent or to an account (other than an account of Pledgor)
        designated by the Collateral Agent with The Depository Trust Company or
        such other depositary, as applicable;

              (b)     Pledged U.S. Government Securities. In the case of
        Collateral consisting of U.S. Government Securities, by transfer of such
        U.S. Government Securities through the Book Entry System of the Federal
        Reserve System to the account of the Collateral Agent or to an account
        (other than an account of Pledgor) designated by the Collateral Agent;
        and

              (c)     Pledged Marketable Securities. In the case of Collateral
        consisting of Marketable Securities, by either (1) delivery of
        certificates evidencing such Marketable Securities, registered in the
        name of the Collateral Agent or its nominee or duly endorsed in blank or
        accompanied by stock powers duly executed in blank, or (2) if such
        Marketable Securities are not held in certificated form but are held in
        book-entry form by The Depository Trust Company or any other comparable
        depositary, by transfer to an account of the Collateral Agent or to an
        account (other than an account of Pledgor) designated by the Collateral
        Agent or to an account (other than an account of Pledgor) designated by
        the Collateral Agent with The Depository Trust Company or such other
        depositary, as applicable. Each such delivery of Marketable Securities
        shall be accompanied by an opinion of counsel satisfactory to the
        Collateral Agent that the Collateral Agent has obtained a valid, first
        priority perfected security interest in, and a first lien upon, such
        Marketable Securities.

Upon delivery of any Pledged Item under this Agreement, the Collateral Agent
shall examine such Pledged Item and any opinions and certificates delivered
pursuant to Sections 5.2 or 5.3, this Section 5.4 or otherwise pursuant to the
terms of this Agreement

                                      -13-



<PAGE>   18



in connection therewith to determine that they comply as to form with the
requirements for Eligible Collateral. Pledgor hereby designates the Collateral
Agent as the Person in whose name any Collateral held in book-entry form in the
Federal Reserve System shall be registered.

        Section 5.5. Insufficiency Determination.

        (a)   If as of 4:00 p.m., New York City time, on any Business Day the
Collateral Agent determines that the aggregate Pledge Value of the Collateral is
less than the Pledge Value Requirement (any such determination, an
"Insufficiency Determination"), the Collateral Agent shall promptly notify
Pledgor of such determination by telephone call to an Authorized Representative
of Pledgor followed by a written confirmation of such call.

        (b)   If, by 4:00 p.m., New York City time on the next Business Day
following the day on which telephonic notice shall have been given pursuant to
the preceding paragraph 5.5(a), Pledgor shall have failed to deliver, in the
manner set forth in Sections 5.3 and 5.4, sufficient additional Eligible
Collateral so that, after giving effect to such delivery, the aggregate Pledge
Value of the Collateral, as of such next business day, is at least equal to the
Pledge Value Requirement, then (x) the Collateral Requirement with respect to
any U.S. Government Securities pledged hereunder (other than in respect of Cash
Delivery Obligations) shall be increased from 150% to 200%, and (y) unless a
Collateral Event of Default shall have occurred and be continuing, the
Collateral Agent shall:

              (i)     commence sales, in the manner described in Section 5.5(c),
        of such portion of the Collateral consisting of U.S. Government
        Securities as may be required to be sold in order to generate proceeds
        sufficient to purchase shares of Class A Common Stock or, after a
        Reorganization Event or Spin-Off Distribution, Marketable Securities of
        the applicable type as described in the following clause (ii); and

              (ii)    commence purchases, in the manner described in Section
        5.5(c), of shares of Class A Common Stock or, after a Reorganization
        Event or Spin-Off Distribution, Marketable Securities of the applicable
        type, in an amount sufficient to cause the aggregate Pledge Value of the
        Collateral to be at least equal to the Pledge Value Requirement.

Notwithstanding the foregoing, the Collateral Agent shall discontinue sales and
purchases pursuant to the preceding clauses (i) and (ii), respectively, if at
any time a Collateral Event of Default shall have occurred and be continuing.
The Collateral Agent shall determine the Market Value and the Pledge Value of
the Collateral after each purchase of shares of Class A Common Stock or
Marketable Securities pursuant to the preceding

                                      -14-



<PAGE>   19



clause (ii) in order to determine whether the Pledge Value Requirement is met
and whether a Collateral Event of Default has occurred. Solely for purposes of
such calculation, the Market Value of the shares of Class A Common Stock or
Marketable Securities shall be: (A) the most recent sales price as reported in
the composite transactions for the principal securities exchange on which the
shares of Class A Common Stock or Marketable Securities, as the case may be, are
then listed or, if such securities are not so listed, the last quoted ask price
for such securities in the over-the-counter market as reported by the NASDAQ
National Market or, if not so reported, by the National Quotation Bureau or a
similar organization; or (B) if higher, in the case of Class A Common Stock, the
most recent available Closing Price.

        (c)   Collateral sold and shares of Class A Common Stock or Marketable
Securities purchased by the Collateral Agent pursuant to the preceding Sections
5.5(a) and (b) may be sold and purchased on any securities exchange or in any
over-the-counter market or in any private purchase transaction, and at such
price or prices, in each case as the Collateral Agent may deem satisfactory.
Pledgor covenants and agrees that it will execute and deliver such documents and
take such other action as the Collateral Agent deems necessary or advisable in
order that any such sales and purchases may be made in compliance with law.

        Section 5.6. Release of Excess Collateral. If on any Business Day the
Collateral Agent determines that the aggregate Pledge Value of Pledgor's
Eligible Collateral exceeds the Pledge Value Requirement and no Event of Default
or failure by Pledgor to meet any of its obligations under Articles IV or V has
occurred and is continuing, Pledgor may obtain the release from the Lien created
by this Agreement of any Collateral having an aggregate Pledge Value on such
Business Day less than or equal to such excess, upon delivery to the Collateral
Agent of a written notice from an Authorized Representative of Pledgor
indicating the items of Collateral to be released. Such Collateral shall be
released only after the Collateral Agent shall have determined that the
aggregate Pledge Value of all of the Collateral remaining after such release as
determined on such Business Day is at least equal to the Pledge Value
Requirement.

        Section 5.7. Delivery of Contract Consideration. On the Exchange Date,
unless (i) a Reorganization Event shall have occurred prior to the Exchange Date
or (ii) if permitted under the Contract, Seller shall have elected the Cash
Settlement Alternative pursuant to Section 2.3(d) of the Contract and made the
cash payment required by that Section, the Collateral Agent shall deliver to
Purchaser from the shares of Class A Common Stock and, if a Spin-Off
Distribution has occurred, Marketable Securities then held by it hereunder
representing the number of shares of Class A Common Stock and Marketable
Securities that were distributed in such Spin-Off Distribution then required to
be delivered by Pledgor under the Contract. If a Reorganization Event shall have
occurred prior to the Exchange Date, then, (A) if so instructed by Pledgor by
the close of business on the Business Day preceding the Exchange Date, the
Collateral Agent shall

                                      -15-



<PAGE>   20



deliver to Purchaser, to the extent Marketable Securities are to be delivered on
such date under Section 6.2 of the Contract, the Marketable Securities then held
by the Collateral Agent hereunder; and (B) if such Reorganization Event is a
Cash Merger, the Collateral Agent shall deliver to Purchaser all cash or other
assets then held by the Collateral Agent and required to be delivered under the
Contract at the time when such delivery is required to be made under the
Contract. Upon such delivery, Purchaser shall hold such shares of Class A Common
Stock or Marketable Securities, cash or other property, as the case may be,
absolutely and free from any claim or right whatsoever.

        Section 5.8. Investment of Cash Collateral. The Collateral Agent shall
invest any cash received by it pursuant to Section 6.2 of the Contract in U.S.
Government Securities maturing before November ___, 2003.

                                   ARTICLE VI

                     INCOME AND VOTING RIGHTS ON COLLATERAL

        Section 6.1. Income on Collateral. Unless an Event of Default or failure
by Pledgor to meet any of its obligations under Article IV or V has occurred and
is continuing, Pledgor shall be entitled to receive for its own account all
dividends, interest and, if any, principal and premium relating to all of the
Collateral, unless the payment of such amounts to Pledgor would reduce the
aggregate Pledge Value of the Collateral below the Pledge Value Requirement. The
Collateral Agent agrees to remit to Pledgor on the Business Day received or the
first Business Day thereafter all such payments received by it. If an Event of
Default or failure by Pledgor to meet any of its obligations under Article IV or
V has occurred and is continuing, all such payments made or accrued after and
during the continuance of such default or failure shall be retained by the
Collateral Agent, and any such payments which are received by Pledgor shall be
received in trust for the benefit of Purchaser, shall be segregated from other
funds of Pledgor and shall forthwith be paid over to the Collateral Agent. Any
such payments so retained by, or paid over to, the Collateral Agent shall be
held by the Collateral Agent as Collateral hereunder.

        Section 6.2. Voting of Collateral. Unless an Event of Default has
occurred and is continuing, Pledgor shall have the right, from time to time, to
vote and to give consents, ratifications and waivers with respect to the
Collateral, and the Collateral Agent shall, upon receiving a written request
from Pledgor, deliver to Pledgor or as specified in such request such proxies,
powers of attorney, consents, ratifications and waivers in respect of any of the
Collateral which is registered in the name of the Collateral Agent or its
nominee as shall be specified in such request and be in form and substance
satisfactory to the Collateral Agent.

        If an Event of Default shall have occurred and be continuing, the
Collateral Agent shall have the right to the extent permitted by law, and
Pledgor shall take all such action

                                      -16-



<PAGE>   21



as may be necessary or appropriate to give effect to such right, to vote and to
give consents, ratifications and waivers, and take any other action with respect
to any or all of the Collateral with the same force and effect as if the
Collateral Agent were the absolute and sole owner of the Collateral.

                                   ARTICLE VII

                         REMEDIES UPON EVENTS OF DEFAULT

        Section 7.1. Rights of Secured Party. If any Event of Default shall have
occurred and be continuing, the Collateral Agent may exercise on behalf of
Purchaser all the rights of a secured party under the UCC (whether or not in
effect in the jurisdiction where such rights are exercised) and, in addition,
without being required to give any notice, except as provided in this Agreement
or as may be required by mandatory provisions of law, shall: (i) deliver all
Collateral consisting of shares of Class A Common Stock or Marketable Securities
(but not, in either case, in excess of the number of shares deliverable under
the Contract at such time) to Purchaser on the date of such Event of Default (in
either case, the "Delivery Date"), whereupon Purchaser shall hold such shares of
Class A Common Stock or Marketable Securities absolutely free from any claim or
right of whatsoever kind, including any equity or right of redemption of Pledgor
which may be waived, and Pledgor, to the extent permitted by law, hereby
specifically waives all rights of redemption, stay or appraisal which it has or
may have under any law now existing or hereafter adopted; and (ii) if such
delivery shall be insufficient to satisfy in full all of the obligations of
Pledgor under the Contract, sell all of the remaining Collateral, or such lesser
portion of the remaining Collateral as may be necessary to generate proceeds
sufficient to satisfy in full all of the obligations of Pledgor under the
Contract, at public or private sale or at any broker's board or on any
securities exchange, for cash, upon credit or for future delivery, and at such
price or prices as the Collateral Agent may deem satisfactory. Pledgor covenants
and agrees that it will execute and deliver such documents and take such other
action as the Collateral Agent deems necessary or advisable in order that any
such sales may be made in compliance with law. Upon any such sale the Collateral
Agent shall have the right to deliver, assign and transfer the Collateral so
sold to the purchaser of such Collateral. Each purchaser at any such sale shall
hold the Collateral so sold absolutely and free from any claim or right of
whatsoever kind, including any equity or right of redemption of Pledgor which
may be waived, and Pledgor, to the extent permitted by law, hereby specifically
waives all rights of redemption, stay or appraisal which it has or may have
under any law now existing or hereafter adopted. The notice (if any) of such
sale required by Article 9 of the UCC shall (1) in case of a public sale, state
the time and place fixed for such sale, (2) in case of sale at a broker's board
or on a securities exchange, state the board or exchange at which such sale is
to be made and the day on which the Collateral, or the portion of such
Collateral so being sold, will first be offered for sale at such board or
exchange, and (3) in the case of a private sale, state the day after which such
sale may be consummated. Any such public

                                      -17-



<PAGE>   22



sale shall be held at such time or times within ordinary business hours and at
such place or places as the Collateral Agent may fix in the notice of such sale.
At any such sale the Collateral may be sold in one lot as an entirety or in
separate parcels, as the Collateral Agent may determine. The Collateral Agent
shall not be obligated to make any such sale pursuant to any such notice. The
Collateral Agent may, without notice or publication, adjourn any public or
private sale or cause the same to be adjourned from time to time by announcement
at the time and place fixed for the sale, and such sale may be made at any time
or place to which the same may be so adjourned. In case of any sale of all or
any part of the Collateral on credit or for future delivery, the Collateral so
sold may be retained by the Collateral Agent until the selling price is paid by
the purchaser of such Collateral, but the Collateral Agent shall not incur any
liability in case of the failure of such purchaser to take up and pay for the
Collateral so sold and, in case of any such failure, such Collateral may again
be sold upon like notice. The Collateral Agent, instead of exercising the power
of sale conferred upon it in this Agreement, may proceed by a suit or suits at
law or in equity to foreclose the security interests and sell the Collateral, or
any portion of such Collateral, under a judgment or decree of a court or courts
of competent jurisdiction.

        Section 7.2. Power of Attorney. Upon any delivery or sale of all or any
part of any Collateral made either under the power of delivery or sale given
hereunder or under judgment or decree in any judicial proceedings for
foreclosure or otherwise for the enforcement of this Agreement, the Collateral
Agent is hereby irrevocably appointed the true and lawful attorney of Pledgor,
in the name and stead of Pledgor, to make all necessary deeds, bills of sale and
instruments of assignment, transfer or conveyance of the property thus delivered
or sold. For that purpose the Collateral Agent may execute all such documents
and instruments. This power of attorney shall be deemed coupled with an
interest, and Pledgor hereby ratifies and confirms all that its attorneys acting
under such power, or such attorneys' successors or agents, shall lawfully do by
virtue of this Agreement. If so requested by the Collateral Agent, by the
Trustees or by any purchaser of the Collateral or a portion of the Collateral,
Pledgor shall further ratify and confirm any such delivery or sale by executing
and delivering to the Collateral Agent, to the Trustees or to such purchaser or
purchasers at the expense of Pledgor all proper deeds, bills of sale,
instruments of assignment, conveyance of transfer and releases as may be
designated in any such request.

        Section 7.3. Application of Collateral and Proceeds. In the case of an
Event of Default, the Collateral Agent may proceed to realize upon the security
interest in the Collateral against any one or more of the types of Collateral,
at any one time, as the Collateral Agent shall determine in its sole discretion
subject to the foregoing provisions of this Article VII. The proceeds of any
sale of, or other realization upon, or other receipt from, any such Collateral
shall be applied by the Collateral Agent in the following order of priorities:

                                      -18-



<PAGE>   23



              first, to the payment to Purchaser of an amount equal to: (A) the
        aggregate Market Value of a number of shares of Class A Common Stock
        and, if a Spin-Off Distribution has occurred, Marketable Securities
        distributed in such Spin-Off Distribution equal to (1) the number of
        shares of Class A Common Stock or shares of Marketable Securities, as
        the case may be, required to be delivered under the Contract on the
        Delivery Date minus (2) the number of shares of Class A Common Stock or
        shares of Marketable Securities, as the case may be, delivered by the
        Collateral Agent to Purchaser on the Delivery Date as described above;
        or (B) from and after a Reorganization Event, the sum of (1) the Cash
        Delivery Obligations on the Delivery Date and (2) the aggregate Market
        Value on the Delivery Date of a number of shares of Marketable
        Securities distributed in such Reorganization Event equal to (x) the
        number of such shares of Marketable Securities permitted to be delivered
        on the Delivery Date under Section 6.2 of the Contract minus (y) the
        number of such shares of Marketable Securities delivered by the
        Collateral Agent to Purchaser on the Delivery Date as described above;
        together with, in either of cases (A) and (B), any amounts due to
        Purchaser from Pledgor pursuant to Section 2.4(k)(ii) of the Trust
        Agreement;

              second, to the payment to the Collateral Agent of the expenses of
        such sale or other realization, including reasonable compensation to the
        Collateral Agent and its agents and counsel, and all expenses,
        liabilities and advances incurred or made by the Collateral Agent in
        connection therewith, including brokerage fees in connection with the
        sale by the Collateral Agent of any Pledged Item; and

              finally, if all of the obligations of Pledgor hereunder and under
        the Contract have been fully discharged or sufficient funds have been
        set aside by the Collateral Agent at the request of Pledgor for the
        discharge of such obligations, any remaining proceeds shall be released
        to Pledgor.

                                  ARTICLE VIII

                              THE COLLATERAL AGENT

        Section 8.1. Conditions to Duties of the Collateral Agent. The
Collateral Agent accepts its duties and responsibilities hereunder as agent for
Purchaser, on and subject to the following terms and conditions:

              (a)     Performance of Duties. The Collateral Agent undertakes to
        perform such duties and only such duties as are expressly set forth in
        this Agreement and, beyond the exercise of reasonable care in the
        performance of such duties, no implied covenants or obligations shall be
        read into this Agreement against the Collateral Agent. No provision of
        this Agreement shall be construed to relieve the Collateral Agent from
        liability for its own grossly negligent action,

                                      -19-



<PAGE>   24



        grossly negligent failure to act, bad faith, wilful misconduct or
        reckless disregard of its duties. In performing its duties, the
        following shall apply:

                        (i)     The Collateral Agent may consult with counsel,
                and the advice or opinion of such counsel shall be full and
                complete authorization and protection in respect of an action
                taken or suffered hereunder in good faith and in accordance with
                such advice or opinion of counsel.

                        (ii)    The Collateral Agent shall not be liable with
                respect to any action taken, suffered or omitted by it in good
                faith (i) reasonably believed by it to be authorized or within
                the discretion or rights or powers conferred on it by this
                Agreement or (ii) in accordance with any direction or request of
                the Trustees.

                        (iii)   The Collateral Agent shall not be liable for any
                error of judgment made in good faith by any of its officers,
                unless the Collateral Agent was grossly negligent in
                ascertaining the pertinent facts.

                        (iv)    In the absence of bad faith on its part, the
                Collateral Agent may conclusively rely, as to the truth of the
                statements and the correctness of the opinions expressed
                therein, upon any note, notice, resolution, consent,
                certificate, affidavit, letter, telegram, teletype message,
                statement, order or other document believed by it to be genuine
                and correct and to have been signed or sent by the proper Person
                or Persons.

                        (v)     No provision of this Agreement shall require the
                Collateral Agent to expend or risk its own funds or otherwise
                incur any financial liability in the performance of any of its
                duties hereunder, or in the exercise of any of its rights or
                powers, if it shall have reasonable grounds for believing that
                repayment of such funds or adequate indemnity against such risk
                or liability is not reasonably assured to it.

                        (vi)    The Collateral Agent may perform any duties
                hereunder either directly or by or through agents or attorneys,
                and the Collateral Agent shall not be responsible for any
                misconduct or negligence on the part of any agent or attorney
                appointed with due care by it hereunder. In furtherance of the
                preceding sentence, any subsidiary owned or controlled by the
                Collateral Agent, or its successors, as agent for the Collateral
                Agent, may perform any or all of the duties of the Collateral
                Agent relating to the valuation of securities and other
                instruments constituting Collateral hereunder.

                                      -20-



<PAGE>   25



                        (vii)   In no event shall the Collateral Agent be
                personally liable for any taxes or other governmental charges
                imposed upon or in respect of (i) the Collateral or (ii) the
                income or other distributions thereon.

                        (viii)  Unless and until the Collateral Agent shall have
                received notice from Pledgor, Purchaser or any other Person, or
                unless and until a Responsible Officer of the Collateral Agent
                shall have actual knowledge to the contrary, the Collateral
                Agent shall be entitled to deem and treat all Collateral
                delivered to it hereunder as Eligible Collateral hereunder,
                provided that the Collateral Agent has carried out the duties
                specified in Article V with respect to such Collateral at the
                time of delivery of such Collateral.

        The Collateral Agent shall not be responsible for the correctness of the
        recitals and statements in this Agreement that are made by Pledgor or
        for any statement or certificate delivered by Pledgor pursuant to this
        Agreement, provided that the Collateral Agent has carried out the duties
        specified in Article V with respect to such Collateral at the time of
        delivery of such Collateral. Except as specifically provided in this
        Agreement, the Collateral Agent shall not be responsible for the
        validity, sufficiency, collectibility or marketability of any Collateral
        given to or held by it hereunder or for the validity or sufficiency of
        the Contract or the Lien on the Collateral purported to be created
        hereby.

              (b)     Knowledge. The Collateral Agent shall not be deemed to
        have knowledge of any Event of Default (except a Collateral Event of
        Default), unless and until a Responsible Officer of the Collateral Agent
        shall have actual knowledge of such Event of Default or the Collateral
        Agent shall have received written notice, delivered in accordance with
        Section 9.3, of such Event of Default.

        Section 8.2. Merger. Any corporation or association into which the
Collateral Agent may be converted or merged, or with which it may be
consolidated, or to which it may sell or transfer its agency business and assets
as a whole or substantially as a whole, or any corporation or association
resulting from any such conversion, sale, merger, consolidation or transfer to
which it is a party, shall be and become the successor Collateral Agent
hereunder and vested with all of the title to the Collateral and all of the
powers, discretions, immunities, privileges and other matters as was its
predecessor without, except as provided above, the execution or filing of any
instrument or any further act, deed or conveyance on the part of any of the
parties to this Agreement, anything in this Agreement to the contrary
notwithstanding.

        Section 8.3. Resignation. Subject to Section 8.5, the Collateral Agent
and any successor Collateral Agent may at any time resign by giving 30 days'
written notice by

                                      -21-



<PAGE>   26



registered or certified mail to Pledgor and notice to Purchaser in accordance
with the provisions of Section 9.3.

        Section 8.4.  Removal.

        (a)   Subject to Section 8.5, the Collateral Agent may be removed at any
time by an instrument or concurrent instruments in writing delivered to the
Collateral Agent and to Pledgor and signed by Purchaser.

        (b)   Subject to Section 8.5, the Collateral Agent shall be removed
immediately upon (i) termination of the Trust Agreement, (ii) termination of the
Administration Agreement (as defined in the Trust Agreement), (iii) termination
of the Paying Agent Agreement (as defined in the Trust Agreement), (iv)
termination of the Custodian Agreement (as defined in the Trust Agreement), or
(v) the resignation or removal of the Administrator, the Paying Agent or the
Custodian (in each case as defined in the Trust Agreement).

        Section 8.5. Effectiveness of Resignation or Removal. No resignation or
removal of the Collateral Agent shall be effective until a successor Collateral
Agent shall have been appointed and shall have accepted the duties of the
Collateral Agent. If, within 30 days after notice by the Collateral Agent to the
Trust or by the Trust to the Collateral Agent of any such resignation or
removal, no successor Collateral Agent shall have been selected and accepted the
duties of the Collateral Agent, the Collateral Agent may apply to a court of
competent jurisdiction for the appointment of a successor Collateral Agent.

        Section 8.6.  Appointment of Successor.

        (a)   If the Collateral Agent hereunder shall resign or be removed, or
be dissolved or shall be in the course of dissolution or liquidation or
otherwise become incapable of action hereunder, or if it shall be taken under
the control of any public officer or officers or of a receiver appointed by a
court, a successor may be appointed by Purchaser by an instrument or concurrent
instruments in writing signed by Purchaser or by its attorneys in fact duly
authorized. A copy of such instrument or concurrent instruments shall be sent by
registered mail to Pledgor.

        (b)   Every such temporary or permanent successor Collateral Agent
appointed pursuant to the provisions of this Agreement shall be a trust company
or bank in good standing, having a reported capital, surplus and retained
earnings of not less than $100,000,000 and capable of holding the Collateral in
the State of New York, if there be such an institution willing, qualified and
able to accept the duties of the Collateral Agent hereunder upon customary
terms.

                                      -22-



<PAGE>   27



        Section 8.7. Acceptance by Successor. Every temporary or permanent
successor Collateral Agent appointed hereunder shall execute, acknowledge and
deliver to its predecessor and also to Pledgor and Purchaser an instrument in
writing accepting such appointment hereunder, whereupon such successor, without
any further act, deed or conveyance, shall become fully vested with all the
estates, properties, rights, powers, duties and obligations of its predecessors.
Such predecessor shall, nevertheless, on the written request of its successor or
Pledgor, execute and deliver an instrument transferring to such successor all
the estates, properties, rights and powers of such predecessor hereunder. Every
predecessor Collateral Agent shall deliver all Collateral held by it as the
Collateral Agent hereunder to its successor. Should any instrument in writing
from Pledgor be required by a successor Collateral Agent for more fully and
certainly vesting in such successor the estates, properties, rights, powers,
duties and obligations hereby vested or intended to be vested in the
predecessor, any and all such instruments in writing shall, at the request of
the temporary or permanent successor Collateral Agent, be forthwith executed,
acknowledged and delivered by Pledgor.

        Section 8.8. Compensation. For services to be rendered by the Collateral
Agent pursuant to this Agreement, the Administrator shall receive only such fees
and expenses as shall be paid to it pursuant to the terms of the Indemnity
Agreement and shall have no recourse to the assets of Purchaser for the payment
of any such amounts.

        Section 8.9. Indemnification. The Trust shall indemnify and hold the
Collateral Agent harmless from and against any loss, damages, cost or expense
(including the costs of investigation, preparation for and defense of legal
and/or administrative proceedings related to a claim against it and reasonable
attorneys' fees and disbursements), liability or claim incurred by reason of any
inaccuracy in information furnished to the Collateral Agent by the Trust, or any
act or omission in the course of, connected with or arising out of any services
to be rendered hereunder, provided that the Collateral Agent shall not be
indemnified and held harmless from and against any such loss, damages, cost,
expense, liability or claim incurred by reason of its willful misfeasance, bad
faith or gross negligence in the performance of its duties, or its reckless
disregard of its duties and obligations hereunder. Such indemnity shall survive
the resignation, removal or discharge of the Collateral Agent and the
termination of this Agreement.



                                   ARTICLE IX

                                  MISCELLANEOUS

        Section 9.1. Termination. This Agreement and the rights hereby granted
by Pledgor in the Collateral shall cease, terminate and be void upon fulfillment
of all of the obligations of Pledgor under the Contract, and Pledgor shall have
no further liability

                                      -23-



<PAGE>   28



hereunder upon such termination. Any Collateral remaining at the time of such
termination (including any shares of Class A Common Stock held following
Seller's election of the Cash Settlement Alternative and payment in respect of
the Cash Settlement Alternative pursuant to the Contract), shall be fully
released and discharged from the Lien created by this Agreement and delivered to
Pledgor by the Collateral Agent, all at the expense of Pledgor.

        Section 9.2. No Assumption of Liability. By executing this Agreement,
none of the Trustees assumes any personal liability under this Agreement.

        Section 9.3. Notices.

        (a)   All notices and other communications provided for in this
Agreement, unless otherwise specified, shall be in writing and shall be given at
the addresses set forth in the following sentence or at such other addresses as
may be designated by notice duly given in accordance with this Section 9.3 to
each other party to this Agreement. Until such notice is given, (i) notices to
Pledgor shall be directed to it at 51 Madison Avenue, New York, New York 10010,
Telecopier No. __________; (ii) notices to the Collateral Agent shall be
directed to it at The Chase Manhattan Bank, 450 West 33rd Street, New York, New
York 10001, Telecopier No. (212) 946-3638, Attention: Pledged Asset Control
Services; and (iii) notices to Purchaser shall be directed to it in care of the
Administrator for Purchaser, The Chase Manhattan Bank, 450 West 33rd Street, New
York, New York 10001, Telecopier No. (212) 946-3638, Attention: Collateral
Management Services.

        (b)   Each notice given pursuant to Section 9.3(a) shall be effective
(i) if sent by certified mail (return receipt requested), 72 hours after being
deposited in the United States mail, postage prepaid; (ii) if given by telex or
telecopier, when such telex or telecopied notice is transmitted (with electronic
confirmation of transmission or verbal confirmation of receipt); or (iii) if
given by any other means, when delivered at the address specified in this
Section 9.3.

        Section 9.4. Governing Law; Severability. This Agreement shall be
governed by and construed in accordance with the laws of the State of New York;
provided that as to Collateral located in any jurisdiction other than the State
of New York, the Collateral Agent on behalf of Purchaser shall have all of the
rights to which a secured party is entitled under the laws of such other
jurisdiction.

        To the extent permitted by law, the unenforceability or invalidity of
any provision or provisions of this Agreement shall not render any other
provision or provisions contained in this Agreement unenforceable or invalid.

                                      -24-



<PAGE>   29



        Section 9.5. Entire Agreement. Except as expressly set forth in this
Agreement, this Agreement constitutes the entire agreement among the parties
with respect to the subject matter of this Agreement and supersedes all prior
agreements, understandings and negotiations, both written and oral, among the
parties with respect to the subject matter of this Agreement.

        Section 9.6. Amendments; Waivers. Any provision of this Agreement may be
amended or waived (either generally or in a particular instance and either
retrospectively or prospectively) if, and only if, such amendment or waiver is
in writing and signed, in the case of an amendment, by Pledgor, the Collateral
Agent and Purchaser or, in the case of a waiver, by the party against whom the
waiver is to be effective. No failure or delay by either party in exercising any
right, power or privilege under this Agreement shall operate as a waiver of such
right, power or privilege nor shall any single or partial exercise of any such
right, power or privilege preclude any other or further exercise of such right,
power or privilege or the exercise of any other right, power or privilege. The
rights and remedies provided in this Agreement shall be cumulative and not
exclusive of any rights or remedies provided by law.

        Section 9.7. Non-Assignability. This Agreement and the rights and
obligations of the parties under this Agreement may not be assigned or delegated
by either party without the prior written consent of the other party, and any
purported assignment without such consent shall be void.

        Section 9.8. No Third Party Rights; Successors and Assigns. This
Agreement is not intended and shall not be construed to create any rights in any
person other than Pledgor, the Collateral Agent and Purchaser and their
respective successors and assigns and no person shall assert any rights as third
party beneficiary under this Agreement. Whenever any of the parties to this
Agreement is referred to, such reference shall be deemed to include the
successors and assigns of such party. All the covenants and agreements in this
Agreement contained by or on behalf of Pledgor, the Collateral Agent and
Purchaser shall bind, and inure to the benefit of, their respective successors
and assigns whether so expressed or not, and shall be enforceable by and inure
to the benefit of Purchaser and its successors and assigns.

        Section 9.9. Counterparts. This Agreement may be executed, acknowledged
and delivered in any number of counterparts, each of which shall be an original,
but all of which shall constitute a single agreement, with the same effect as if
the signatures on each such counterpart were upon the same instrument.



                                      -25-



<PAGE>   30



        IN WITNESS WHEREOF, the parties have caused this Collateral Agreement to
be duly executed and delivered as of the first date set forth above.

                                    PLEDGOR:

                                    NYLIFE LLC


                                    By:
                                       ------------------------------
                                       Name:
                                       Title:


                                    THE COLLATERAL AGENT:

                                    THE CHASE MANHATTAN BANK,
                                    as Collateral Agent


                                    By:
                                       ------------------------------
                                       Name:
                                       Title:


                                    PURCHASER:

                                    EXPRESS SCRIPTS AUTOMATIC
                                    EXCHANGE SECURITY TRUST


                                    By:
                                       ------------------------------
                                       Donald J. Puglisi,
                                       as Trustee


                                    By:
                                       ------------------------------
                                       William R. Latham, III,
                                       as Trustee


                                    By:
                                       ------------------------------
                                       James B. O'Neill,
                                       as Trustee

                                      -26-



<PAGE>   31



                                                                 Exhibit A
                                                                    to
                                                           Collateral Agreement



                             NOTICE OF PLEDGE VALUE


To:           __________ NYLIFE LLC

              Telecopier No. __________

        THE CHASE MANHATTAN BANK, as Collateral Agent (the "Collateral Agent")
under the Collateral Agreement, dated as of November ___, 2000 (the "Collateral
Agreement"), among you, as Pledgor, the Collateral Agent and Express Scripts
Automatic Exchange Security Trust, hereby notifies you, pursuant to Section 5.1
of the Collateral Agreement, that as of 4:00 p.m. New York City time on
_________ __, _____:

        1. The Pledge Value was $__________; and

        2. The Pledge Value Requirement was $____________.

        Capitalized terms not otherwise defined in this Notice have the
respective meanings specified in the Collateral Agreement.

                             THE CHASE MANHATTAN BANK,
                             as Collateral Agent


                             By:
                                ----------------------------------
                                Name:
                                Title:


                                      -27-



<PAGE>   32



                                                                  Exhibit B
                                                                     to
                                                            Collateral Agreement

                     CERTIFICATE FOR SUBSTITUTED COLLATERAL

        The undersigned, NYLIFE LLC (the "Pledgor"), hereby certifies, pursuant
to Section 5.2(b) of the Collateral Agreement, dated as of November __, 2000
(the "Collateral Agreement"), among Pledgor, The Chase Manhattan Bank, as
Collateral Agent, and Express Scripts Automatic Exchange Security Trust, that:

        1.    Pledgor is delivering the following securities to the Collateral
Agent to be held by the Collateral Agent as substituted Collateral (the
"Substituted Collateral"):

        [INSERT DESCRIPTION OF SUBSTITUTE COLLATERAL]

        2.    Pledgor requests that the Collateral Agent transfer to Pledgor the
following Prior Collateral, pursuant to Section 5.2 of the Collateral Agreement:
[INSERT DESCRIPTION OF PRIOR COLLATERAL]

        3.    Pledgor hereby represents and warrants to the Collateral Agent and
Purchaser that:

              (a)     Consents to Transfer. No Transfer Restrictions exist with
        respect to or otherwise apply to the pledge or assignment of, or
        transfer by Pledgor of, any items of Substituted Collateral to the
        Collateral Agent under the Collateral Agreement, or the subsequent sale
        or transfer of such items of Substituted Collateral by the Collateral
        Agent pursuant to the terms of the Collateral Agreement.

              (b)     Title to Collateral; Perfected Security Interest. Pledgor
        has good and marketable title to the Substituted Collateral, free of all
        Liens (other than the Lien created by the Collateral Agreement) and
        Transfer Restrictions and has good, right and lawful authority to
        assign, transfer and pledge such Substitute Collateral under the
        Collateral Agreement. Upon delivery of the Substituted Collateral to the
        Collateral Agent under the Collateral Agent, the Collateral Agent will
        obtain a valid, first priority perfected security interest in, and a
        first lien upon, such Substituted Collateral subject to no other Lien.
        None of such Substituted Collateral is or shall be pledged by Pledgor as
        collateral for any other purpose.

        This Certificate may be relied upon by Purchaser as fully and to the
same extent as if this Certificate had been specifically addressed to Purchaser.
Capitalized terms not

                                      -28-



<PAGE>   33



otherwise defined Certificate have the respective meanings specified in the
Collateral Agreement.

                                      -29-



<PAGE>   34



        IN WITNESS WHEREOF, the undersigned has executed this Certificate this
_____ day of ____________, ____.

                                    NYLIFE LLC


                                    By:
                                       -------------------------------
                                       Name:
                                       Title:



                                      -30-



<PAGE>   35



                                                                  Exhibit C
                                                                     to
                                                            Collateral Agreement

                      CERTIFICATE FOR ADDITIONAL COLLATERAL

        The undersigned, NYLIFE LLC (the "Pledgor"), hereby certifies, pursuant
to Section 5.3 of the Collateral Agreement, dated as of November __, 2000 (the
"Collateral Agreement"), among Pledgor, The Chase Manhattan Bank, as Collateral
Agent, and Express Scripts Automatic Exchange Security Trust, that:

        1.    Pledgor is delivering the following securities to the Collateral
Agent to be held by the Collateral Agent as additional Collateral (the
"Additional Collateral"):

        [INSERT DESCRIPTION OF ADDITIONAL COLLATERAL]

        2.    Pledgor hereby represents and warrants to the Collateral Agent and
Purchaser that:

              (a)     Consents to Transfer. No Transfer Restrictions exist with
        respect to or otherwise apply to the pledge or assignment of, or
        transfer by Pledgor of, any items of Additional Collateral to the
        Collateral Agent under the Collateral Agreement, or the subsequent sale
        or transfer of such items of Additional Collateral by the Collateral
        Agent pursuant to the terms of the Collateral Agreement.

              (b)     Title to Collateral; Perfected Security Interest. Pledgor
        has good and marketable title to the Additional Collateral, free of all
        Liens (other than the Lien created by the Collateral Agreement) and
        Transfer Restrictions and has good, right and lawful authority to
        assign, transfer and pledge such Additional Collateral under the
        Collateral Agreement. Upon delivery of the Additional Collateral to the
        Collateral Agent, the Collateral Agent will obtain a valid, first
        priority perfected security interest in, and a first lien upon, such
        Additional Collateral subject to no other Lien. None of such Additional
        Collateral is or shall be pledged by Pledgor as collateral for any other
        purpose.

        This Certificate may be relied upon by Purchaser as fully and to the
same extent as if this Certificate had been specifically addressed to Purchaser.

        Capitalized terms not otherwise defined Certificate have the respective
meanings specified in the Collateral Agreement.


                                      -31-



<PAGE>   36


        IN WITNESS WHEREOF, the undersigned has executed this Certificate this
_____ day of ____________, ____.

                             NYLIFE LLC


                             By:
                                 -----------------------------------
                                 Name:
                                 Title:





                                      -32-



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