<PAGE>   1
                                                                     Exhibit 4.2


                              AMENDED AND RESTATED

                                 TRUST AGREEMENT

                                       OF

                         UBS PREFERRED FUNDING TRUST III

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


                      UBS PREFERRED FUNDING COMPANY LLC III
                                   AS GRANTOR
                                       AND
                            WILMINGTON TRUST COMPANY
                                   AS TRUSTEE
                               ------------------


                              DATED AS OF -, 2001
<PAGE>   2
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                               Page
                                                                               ----
<S>                                                                            <C>
                                    ARTICLE I
                                   DEFINITIONS

Section 1.01.  Definitions..................................................    1

                                   ARTICLE II
                               TRUST INDENTURE ACT

Section 2.01.  Trust Indenture Act; Application.............................    5
Section 2.02.  Lists of Holders of the Trust Preferred Securities...........    6
Section 2.03.  Reports by the Trustee.......................................    6
Section 2.04.  Periodic Reports to the Trustee..............................    6
Section 2.05.  Evidence of Compliance with Conditions Precedent.............    6
Section 2.06.  Defaults; Waiver.............................................    7
Section 2.07.  Trust Enforcement Event; Notice..............................    7

                                   ARTICLE III
                              CONTINUATION OF TRUST

Section 3.01.  Continuation of Trust........................................    8
Section 3.02.  Trust Account................................................    8
Section 3.03.  Title to Trust Property......................................    9
Section 3.04.  Situs of Trust...............................................    9
Section 3.05.  Business of the Trust........................................    9
Section 3.06.  Liability of Holders of the Trust Preferred Securities.......    9

                                   ARTICLE IV
                FORM OF TRUST PREFERRED SECURITIES, EXECUTION AND
         DELIVERY, TRANSFER AND SURRENDER OF TRUST PREFERRED SECURITIES

Section 4.01.  Form and Transferability of Trust Preferred Securities.......    9
Section 4.02.  Issuance of Trust Preferred Securities.......................   10
Section 4.03.  Registration, Transfer and Exchange of Trust Preferred
                Securities..................................................   12
Section 4.04.  Lost or Stolen Trust Preferred Securities, Etc...............   13
Section 4.05.  Cancellation and Destruction of Surrendered Certificates.....   14
Section 4.06.  Surrender of Trust Preferred Securities and Withdrawal of
                Company Preferred Securities................................   14
Section 4.07.  Redeposit of Company Preferred Securities....................   15
Section 4.08.  Filing Proofs, Certificates and Other Information............   16
</TABLE>


                                       -i-
<PAGE>   3
<TABLE>
<CAPTION>
                                                                               Page
                                                                               ----
<S>                                                                            <C>
                                    ARTICLE V
                    DISTRIBUTIONS AND OTHER RIGHTS OF HOLDERS
                          OF TRUST PREFERRED SECURITIES

Section 5.01.  Periodic Distributions.......................................   16
Section 5.02.  Redemptions of Company Preferred Securities..................   16
Section 5.03.  Distributions in Liquidation of Grantor......................   17
Section 5.04.  Fixing of Record Date for Holders of the Trust Preferred
                Securities..................................................   17
Section 5.05.  Payment of Distributions.....................................   18
Section 5.06.  Voting Rights................................................   19
Section 5.07.  Currency.  ..................................................   19

                                   ARTICLE VI
                                   THE TRUSTEE

Section 6.01.  Eligibility..................................................   19
Section 6.02.  Obligations of the Trustee...................................   20
Section 6.03.  Resignation and Removal of the Trustee; Appointment of
                Successor Trustee...........................................   23
Section 6.04.  Notices......................................................   24
Section 6.05.  Status of Trust..............................................   24
Section 6.06.  Appointment of Grantor to File on Behalf of Trust............   25
Section 6.07.  Indemnification by the Grantor...............................   25
Section 6.08.  Fees, Charges and Expenses...................................   25
Section 6.09.  Appointment of Co-Trustee or Separate Trustee................   26

                                   ARTICLE VII
                            AMENDMENT AND TERMINATION

Section 7.01.  Supplemental Trust Agreement.................................   27
Section 7.02.  Termination..................................................   28

                                  ARTICLE VIII
                                  MISCELLANEOUS

Section 8.01.  Counterparts.................................................   28
Section 8.02.  Exclusive Benefits of Parties................................   29
Section 8.03.  Invalidity of Provisions.....................................   29
Section 8.04.  Notices......................................................   29
Section 8.05.  Holders of the Trust Preferred Securities Are Parties........   30
Section 8.06.  Governing Law................................................   30
</TABLE>


                                      -ii-
<PAGE>   4
<TABLE>
<CAPTION>
                                                                               Page
                                                                               ----
<S>                                                                            <C>
Section 8.07.  Headings.....................................................   30
Section 8.08.  Trust Preferred Securities Non-Assessable and Fully Paid.....   30
Section 8.09.  No Preemptive Rights.........................................   30
Section 8.10.  Survival.....................................................   31
</TABLE>


EXHIBIT A         Form of Trust Preferred Securities


                                      -iii-
<PAGE>   5
                             CROSS-REFERENCE TABLE(1)

<TABLE>
<CAPTION>
SECTION OF                                              SECTION OF
TRUST INDENTURE ACT OF 1939, AS AMENDED                 AMENDED AND RESTATED
                                                        TRUST AGREEMENT

<S>                                                     <C>
310(a)...............................................   6.01, 6.09(b)(i)
310(b)...............................................   6.01
310(c)...............................................   Inapplicable
311(a)...............................................   2.02(a)
311(b)...............................................   2.02(b)
311(c)...............................................   Inapplicable
312(a)...............................................   2.02(a)
312(b)...............................................   2.02(b)
313..................................................   2.03
314(a)...............................................   2.04
314(b)...............................................   Inapplicable
314(c)...............................................   2.05
314(d)...............................................   Inapplicable
314(f)...............................................   Inapplicable
315(a)...............................................   6.02
315(b)...............................................   2.07
315(c)...............................................   6.02
315(d)...............................................   6.02
316(a)...............................................   2.06, 5.06
316(c)...............................................   5.04
</TABLE>

--------

(1)   This Cross-Reference Table does not constitute part of the Declaration and
      shall not affect the interpretation of any of its terms or provisions.


<PAGE>   6
                              AMENDED AND RESTATED
                                 TRUST AGREEMENT

                                       OF

                         UBS PREFERRED FUNDING TRUST III


            AMENDED AND RESTATED TRUST AGREEMENT, dated as of -, 2001, is
between UBS PREFERRED FUNDING COMPANY LLC III, a Delaware limited liability
company, as grantor (the "Grantor"), and Wilmington Trust Company, a Delaware
bank and trust company, as trustee (the "Trustee").

                               W I T N E S S E T H

            WHEREAS, the Trustee and the Grantor established UBS Preferred
Funding Trust III (the "Trust") under the Delaware Business Trust Act (12 Del.
C. Section 3801, et seq.) (as amended from time to time, the "Business Trust
Act"), pursuant to a Trust Agreement, dated as of -, 2001 (the "Original Trust
Agreement"), and a Certificate of Trust for the Trust was filed with the
Secretary of State of the State of Delaware on -, 2001; and

            WHEREAS, the Trustee and the Grantor hereby desire to continue the
Trust and to amend and restate in its entirety the Original Trust Agreement; and

            WHEREAS, the Trust proposes to issue $- aggregate liquidation
amount of - % Noncumulative Trust Preferred Securities (the "Trust Preferred
Securities") representing a corresponding amount of - % Noncumulative Company
Preferred Securities (the "Company Preferred Securities") guaranteed on a
subordinated basis (the "Subordinated Guarantee") by UBS AG (the "Bank").

            NOW, THEREFORE, in consideration of the premises contained herein
and intending to be legally bound hereby, it is agreed among the parties hereto
to amend and restate in its entirety the Original Trust Agreement as follows:


                                    ARTICLE I
                                   DEFINITIONS

            Section 1.01. Definitions. The following definitions shall apply to
the respective terms (in the singular and plural forms of such terms) used in
this Trust Agreement and the Trust Preferred Securities:


                                       -1-
<PAGE>   7
                  "Affiliate" of any specified Person means any other Person
      controlling or controlled by or under common control with such specified
      Person. For the purposes of this definition, "control" when used with
      respect to any specified Person means the power to direct the management
      and polities of such Person, directly or indirectly whether through the
      ownership of voting securities, by contract or otherwise, and the terms
      "controlling" and "controlled" have meanings correlative to the foregoing.

                  "Bank" means UBS AG, a bank organized under the laws of
Switzerland.

                  "Business Day" means a day on which (i) the Trans-European
      Automated Real-Time Gross settlement Express Transfer system ("Target") is
      operating, (ii) banks are open for business and carrying out transactions
      in U.S. dollars in London and Luxembourg and (iii) banks are open for
      business in Wilmington, Delaware, U.S.A.

                  "Business Trust Act" has the meaning specified in the recitals
      to this Trust Agreement.

                  "Clearing Agency" has the meaning set forth in Section 4.06.

                  "Clearing Agency Participant" means a broker, dealer, bank,
      other financial institution or other Person for whom from time to time the
      Clearing Agency effects book-entry transfers and pledges of interest in
      securities deposited with the Clearing Agency.

                  "Clearstream" means Clearstream Banking societe anonyme.

                  "Company Preferred Securities" means the - % Noncumulative
      Company Preferred Securities, aggregate liquidation preference $-,
      offered by the Company pursuant to a prospectus dated -, 2001.

                  "Company Preferred Securities Certificate" means the Company
      Preferred Security certificates evidencing Company Preferred Securities
      held by the Trustee (unless withdrawn under Section 4.06) from time to
      time under this Trust Agreement for the benefit of Holders of the Trust
      Preferred Securities.

                  "Corporate Office" means the principal corporate office of the
      Trustee at which at any particular time its business in respect of matters
      governed by this Trust Agreement shall be administered, which at the date
      of this Trust Agreement is located at Wilmington Trust Company, 1100 North
      Market Street, Wilmington, Delaware 19890.

                  "corresponding amount" means (i) for each $- liquidation
      amount of Trust Preferred Securities, $- liquidation preference of
      Company Preferred Securities


                                       -2-
<PAGE>   8
      and (ii) for each $- liquidation preference of Company Preferred
      Securities, $- liquidation amount of Trust Preferred Securities.

                  "Definitive Trust Preferred Securities Certificate" means any
      definitive permanent registered Trust Preferred Securities issued in
      exchange for all or a part of the Global Certificate and no longer held by
      DTC.

                  "Dividend" has the meaning specified in the LLC Agreement for
      "dividend".

                  "DTC" means The Depository Trust Company.

                  "Euroclear" means Morgan Guaranty Trust Company of New York,
      Brussels office, as operator of the Euroclear System.

                  "Global Certificate" mean the single global Trust Preferred
      Securities Certificate held by DTC representing the shares of the Trust
      Preferred Securities.

                  "Grantor" means UBS Preferred Funding Company LLC, a Delaware
      limited liability company, and its successors.

                  "Holder" means the Person in whose name a Trust Preferred
      Security is registered on the Register maintained by the Registrar for
      such purposes.

                  "Issue Date" means the date on which the Trust Preferred
      Securities and the Company Preferred Securities are initially issued.

                  "Liquidation Preference" has the meaning specified in the LLC
      Agreement.

                  "List of Holders" has the meaning specified in Section
      2.02(a).

                  "LLC Agreement" means the Amended and Restated Limited
      Liability Company Agreement of the Grantor, dated as of -, 2001, and as
      from time to time amended, modified or supplemented.

                  "Opinion of Counsel" means the written opinion of counsel, who
      may be counsel to the Grantor, and who shall be reasonably acceptable to
      the Trustee.

                  "Original Trust Agreement" has the meaning specified in the
      recitals to this Trust Agreement.


                                       -3-
<PAGE>   9
                  "Owner" has the meaning specified in Section 4.06.

                  "Paying Agent" means the Person or Persons from time to time
      appointed and acting as Paying Agent as provided in Section 5.05 and shall
      initially be Wilmington Trust Company and in Luxembourg shall initially be
      BNP Paribas.

                  "Person" means any individual, general partnership, limited
      partnership, corporation, limited partnership, joint venture, trust,
      business trust, cooperative or association and the heirs, executors,
      administrators, legal representatives, successors and assigns of such
      Person where the context so admits.

                  "Redemption Date" has the meaning specified in Section 5.02.

                  "Register" has the meaning specified in Section 4.03 of this
      Trust Agreement.

                  "Registrar" means any bank or trust company appointed to
      register Trust Preferred Securities and transfers thereof as herein
      provided, and shall initially be Wilmington Trust Company.

                  "Regular Distribution" has the meaning specified in Section
      5.04.

                  "Securities Act" means the Securities Act of 1933, as amended.

                  "Subordinated Guarantee" means the Bank's guarantee, on a
      subordinated basis, of the Company Preferred Securities, pursuant to the
      UBS AG Subordinated Guarantee Agreement, dated as of -, 2001, and as
      from time to time amended, modified or supplemented.

                  "Transfer Agent" means the Person or Persons from time to time
      appointed and acting as Transfer Agent as provided in Section 4.03(c) and
      shall initially be Wilmington Trust Company and in Luxembourg shall
      initially be BNP Paribas.

                  "Trust" means UBS Preferred Funding Trust I, the Delaware
      business trust governed by this Trust Agreement.

                  "Trust Agreement" means this Trust Agreement, as the same may
      be amended, modified or supplemented from time to time.

                  "Trust Estate" means all right, title and interest of the
      Trust in and to the Company Preferred Securities and the related rights of
      the Trust under the Subordinated Guarantee from time to time held by the
      Trustee hereunder, and all distributions and


                                       -4-
<PAGE>   10
      payments with respect thereto. "Trust Estate" shall not include any
      amounts paid or payable to the Bank pursuant to this Trust Agreement,
      including, without limitation, fees, expenses and indemnities.

                  "Trust Indenture Act" means the Trust Indenture Act of 1939,
      as amended from time to time.

                  "Trust Preferred Securities" means the - % Noncumulative
      Trust Preferred Securities, aggregate liquidation amount $-, offered by
      the Trust, representing a corresponding amount of the Company Preferred
      Securities.

                  "Trust Preferred Securities Certificate" means a Trust
      Preferred Security certificate, issued hereunder evidencing Trust
      Preferred Securities representing a corresponding amount of the Company
      Preferred Securities.

                  "Trustee" means Wilmington Trust Company, in its capacity as
      Trustee and not in its individual capacity.

                  "U.S. dollars," "dollars", "U.S.$" and "$" means the currency
      of the United States of America.


                                   ARTICLE II
                               TRUST INDENTURE ACT

            Section 2.01.  Trust Indenture Act; Application.

            (a) This Trust Agreement is subject to the provisions of the Trust
Indenture Act that are required to be part of this Trust Agreement and shall, to
the extent applicable, be governed by such provisions. A term defined in the
Trust Indenture Act has the same meaning when used in this Trust Agreement,
unless otherwise defined in this Trust Agreement or unless the context otherwise
requires.

            (b) If and to the extent that any provision of this Trust Agreement
limits, qualifies or conflicts with the duties imposed by Sections 310 to 317,
inclusive, of the Trust Indenture Act, such imposed duties shall control.

            (c) The application of the Trust Indenture Act to this Trust
Agreement shall not affect the nature of the Trust Preferred Securities as
equity securities representing undivided beneficial interests in the assets of
the Trust.


                                       -5-
<PAGE>   11
            Section 2.02.  Lists of Holders of the Trust Preferred Securities.

            (a) If the Trust Preferred Securities are not held in the form of a
Global Certificate registered in the name of DTC or its nominee, the Grantor
shall provide the Trustee a list, in such form as the Trustee may reasonably
require, of the names and addresses of the Holders of the Trust Preferred
Securities ("List of Holders") (i) within 14 days after each record date for
payment of Dividends, as of such record date and (ii) at any other time, within
30 days of receipt by the Trust of a written request from the Trustee for such
List, as of a date no more than 14 days before such List of Holders is given to
the Trustee. The Trustee shall preserve, in as current a form as is reasonably
practicable, all information contained in Lists of Holders given to it or which
it receives in the capacity as Paying Agent (if acting in such capacity);
provided that the Trustee may destroy any List of Holders previously given to it
on receipt of a new List of Holders.

            (b) The Trustee shall comply with its obligations under Sections
311(a), 311(b) and 312(b) of the Trust Indenture Act.

            Section 2.03. Reports by the Trustee. Within 60 days after May 1 of
each year, the Trustee shall provide to the Holders of the Trust Preferred
Securities such reports as are required by Section 313 of the Trust Indenture
Act, if any, in the form and in the manner provided by Section 313 of the Trust
Indenture Act. The Trustee shall also comply with the requirements of Section
313(d) of the Trust Indenture Act.

            Section 2.04. Periodic Reports to the Trustee. The Grantor shall
provide to the Trustee such documents, reports and information as required by
Section 314 of the Trust Indenture Act (if any) and the compliance certificate
required by Section 314 of the Trust Indenture Act in the form and manner and at
the times required by Section 314 of the Trust Indenture Act. Delivery of such
reports, information and documents to the Trustee is for informational purposes
only and the Trustee's receipt of such shall not constitute constructive notice
of any information contained therein or determinable from information contained
therein, including the Trust's compliance with any of its covenants hereunder
(as to which the Trustee is entitled to rely exclusively on Officers'
Certificates).

            Section 2.05. Evidence of Compliance with Conditions Precedent. The
Grantor shall provide to the Trustee evidence of compliance with the conditions
precedent, if any, provided for in this Trust Agreement that relate to any of
the matters set forth in Section 314(c) of the Trust Indenture Act. Any
certificate or opinion required to be given by an officer pursuant to Section
314(c)(1) of the Trust Indenture Act may be given in the form of an Officers'
Certificate.


                                       -6-
<PAGE>   12
            Section 2.06.  Defaults; Waiver.

            (a) The Holders of a majority in liquidation amount of the Trust
Preferred Securities may, by vote, on behalf of the Holders of all of the Trust
Preferred Securities, waive any past default in respect of the Trust Preferred
Securities and its consequences; provided that, if the underlying event of
default is also a default in respect of the Company Preferred Securities and:

                  (i)   is not waivable under the LLC Agreement, the default
      under this Trust Agreement shall also not be waivable; or

                  (ii) requires the consent or vote of the holders of more than
      50% of the aggregate liquidation preference of the Company Preferred
      Securities to be waived under the LLC Agreement (a "Super Majority"), the
      default under this Trust Agreement may only be waived by the vote of the
      Holders of at least the relevant Super Majority in liquidation amount of
      the Trust Preferred Securities.

            The foregoing provisions of this Section 2.06(a) shall be in lieu of
Section 316(a)(1)(B) of the Trust Indenture Act and such Section 316(a)(1)(B) of
the Trust Indenture Act is hereby expressly excluded from this Trust Agreement
and the Trust Preferred Securities, as permitted by the Trust Indenture Act.
Upon such waiver, any such default shall cease to exist, and any default with
respect to the Trust Preferred Securities arising therefrom shall be deemed to
have been cured, for every purpose of this Trust Agreement, but no such waiver
shall extend to any subsequent or other default with respect to the Trust
Preferred Securities or impair any right consequent thereon.

            (b) A waiver of a default under the LLC Agreement by the Trustee at
the direction of the Holders of the Trust Preferred Securities constitutes a
waiver of the corresponding default under this Trust Agreement. The foregoing
provisions of this Section 2.06(b) shall be in lieu of Section 316(a)(1)(B) of
the Trust Indenture Act and such Section 316(a)(1)(B) of the Trust Indenture Act
is hereby expressly excluded from this Trust Agreement and the Trust Preferred
Securities, as permitted by the Trust Indenture Act.

            Section 2.07. Trust Enforcement Event; Notice. The Trustee shall,
within 90 days after the occurrence of a default with respect to the Trust
Preferred Securities, transmit by mail, first class postage prepaid, to the
Holders of the Trust Preferred Securities, notices of all defaults with respect
to the Trust Preferred Securities actually known to the Trustee, unless such
defaults shall have been cured before the giving of such notice; provided that,
the Trustee shall be protected in withholding such notice if and so long as the
Trustee in good faith determines that the withholding of such notice is in the
interests of the Holders of the Trust Preferred Securities.


                                       -7-
<PAGE>   13
                                   ARTICLE III
                              CONTINUATION OF TRUST

            Section 3.01.  Continuation of Trust.

            (a) The Trust continued hereby shall be known as "UBS Preferred
Funding Trust III," in which name the Trust may engage in the transactions
contemplated hereby, make and execute contracts and other instruments and sue
and be sued. The Trustee shall have the power and authority to cause the Trust
to do such things. It is the intention of the parties that the Trust continued
hereby constitute a business trust under the Business Trust Act and that this
Agreement constitute the governing instrument of the Trust. The Trust exists for
the sole purpose of issuing Trust Preferred Securities representing an undivided
beneficial interest in the Company Preferred Securities held by the Trust and
performing functions directly related thereto. The Grantor hereby delivers to
the Trustee for deposit in the Trust one or more Company Preferred Securities
Certificates representing Company Preferred Securities with an aggregate
liquidation preference of $- for the benefit of the Holders of the Trust
Preferred Securities. To the fullest extent permitted by law, without the need
for any other action of any Person, including the Trustee or any other Holder,
each Holder shall be entitled to enforce, in the name of the Trust, the rights
of the Trust under the Company Preferred Securities and the Subordinated
Guarantee represented by the Trust Preferred Securities held by such Holder. Any
recovery on such an enforcement action shall belong solely to such Holder who
brought the action, not to the Trust, the Trustee or any other Holder
individually or to the Holders as a group. The Trustee shall have the power and
authority (subject to the Trustee's rights, privileges and protections in
Section 6.02 and elsewhere herein) to enforce any of the Trust's rights in
respect of the Company Preferred Securities which are not enforced by any
Holder. Subject to Section 7.02, the Trust shall be irrevocable.

            (b) The Trustee hereby acknowledges receipt of one or more Company
Preferred Securities Certificates representing Company Preferred Securities
having an aggregate liquidation preference of $- registered in the name of the
Trust, and its acceptance on behalf of the Trust of the Company Preferred
Securities, and declares that the Trust shall hold the Company Preferred
Securities for the benefit of the Holders of the Trust Preferred Securities.

            Section 3.02. Trust Account. The Trustee shall open an account with
a banking institution authorized to exercise corporate trust powers and having a
combined capital and surplus of at least [$50,000,000] and subject to
supervision or examination by a federal or state banking authority. Such account
shall be entitled "UBS Preferred Funding Trust III -- Trust Account." All
distributions received by the Trustee on behalf of the Trust in respect of the
Company Preferred Securities shall be deposited in such account by the Trustee
until distributed as provided in Article IV.


                                       -8-
<PAGE>   14
            Section 3.03. Title to Trust Property. Legal title to the Trust
Estate shall be vested at all times in the Trust.

            Section 3.04. Situs of Trust. The situs of the Trust shall be in
Wilmington, Delaware. The account described in Section 3.02 shall be maintained
with a bank in the State of Delaware. The Trustee shall cause the books and
records of the Trust to be maintained at the Corporate Office. The Trust Estate
shall be held in the State of Delaware. Notwithstanding the foregoing, the
Trustee may transfer such of the books and records of the Trust to a co-trustee
appointed pursuant to Section 6.09 or to such agents as it may appoint in
accordance with the Section 8.05, as shall be reasonably necessary (and for so
long as may be reasonably necessary) to enable such co-trustee or agents to
perform the duties and obligations for which such co- trustee or agents may be
so employed.

            Section 3.05. Business of the Trust. The Trust has been formed for
the purpose of: (i) issuing the Trust Preferred Securities, (ii) investing the
proceeds of the Trust Preferred Securities in the Company Preferred Securities,
which benefit from the related Subordinated Guarantee and (iii) engaging in any
related or incidental activities. The Trust shall have the power and authority
to execute, deliver and perform its obligations under the LLC Agreement and
other agreements to which the Trust is a party and to become a member of the
Grantor.

            The only assets of the Trust shall be the Company Preferred
Securities and the related rights of the Trust under the Subordinated Guarantee.
The Trust may not acquire any other assets, issue any other equity securities or
any debt securities, or engage in any other activities.

            Section 3.06. Liability of Holders of the Trust Preferred
Securities. With respect to the Trust, Holders of the Trust Preferred Securities
shall be entitled to the same limitation of personal liability to which
stockholders of private corporations for profit organized under the General
Corporation Law of the State of Delaware are extended.


                                   ARTICLE IV
                FORM OF TRUST PREFERRED SECURITIES, EXECUTION AND
         DELIVERY, TRANSFER AND SURRENDER OF TRUST PREFERRED SECURITIES

            Section 4.01. Form and Transferability of Trust Preferred
Securities.

            (a) Except as otherwise required by DTC, the Trust Preferred
Securities shall be in substantially the form set forth in Exhibit A, with the
appropriate insertions, modifications and omissions, as hereinafter provided.


                                       -9-
<PAGE>   15
            (b) The Trust Preferred Securities shall be issued in denominations
of $25 liquidation amount and whole-number multiples of $25. All Trust Preferred
Securities shall be dated the date of their execution or countersignature.

            (c) Trust Preferred Securities may be endorsed with or have
incorporated in the text thereof such legends or recitals or changes not
inconsistent with the provisions of this Trust Agreement as may be required by
the Trustee or any applicable law or regulation or the rules and regulations of
any securities exchange upon which the Trust Preferred Securities may be listed
or to conform with any usage with respect thereto.

            (d) Title to any Trust Preferred Security that is properly endorsed
or accompanied by a properly executed instrument of transfer or endorsement
shall be transferable by delivery with the same effect as in the case of a
negotiable instrument; provided, however, that until the transfer shall be
registered on the Register as provided in Section 4.03, the Trust, the Trustee,
the Registrar and the Grantor may, notwithstanding any notice to the contrary,
treat the Holder thereof at such time as the absolute owner thereof for the
purpose of determining the Person entitled to distributions or to any notice
provided for in this Trust Agreement and for all other purposes.

            (e) Trust Preferred Securities shall be executed by the Trustee by
the manual signature of a duly authorized signatory of the Trustee, provided,
however, that such signature may be a facsimile if a Registrar (other than the
Trustee) shall have countersigned the Trust Preferred Security by manual
signature of a duly authorized signatory of the Registrar. No Trust Preferred
Security shall be entitled to any benefit under this Trust Agreement or be valid
or obligatory for any purpose unless it shall have been executed as provided in
the preceding sentence. The Registrar shall record on the Register each Trust
Preferred Securities executed as provided above and delivered as hereinafter
provided. Trust Preferred Securities bearing the signatures of individuals who
were, at the time when such signatures shall have been affixed, authorized to
sign on behalf of the Trustee shall be validly issued notwithstanding that such
individuals or any of them shall have ceased to be so authorized prior to the
delivery of such Trust Preferred Securities or did not hold such offices at the
date of delivery of such Trust Preferred Securities.

            Section 4.02.  Issuance of Trust Preferred Securities.

            (a) The Trustee having received on behalf of the Trust one or more
Company Preferred Securities Certificates representing Company Preferred
Securities with an aggregate liquidation preference of $- and having
acknowledged such receipt in Section 3.01(b), subject to the terms and
conditions of this Trust Agreement, the Trustee, on behalf of the Trust, shall
execute and deposit a single Global Certificate with DTC, which shall thereupon
be the initial Holder of the Trust Preferred Securities.


                                      -10-
<PAGE>   16
            (b) Beneficial interests in the Trust Preferred Securities will be
evidenced by, and transfers thereof will be effected only through, records
maintained by the Clearing Agency Participants. Unless and until Definitive
Trust Preferred Securities Certificates have been issued to the Owners pursuant
to Section 4.03(c):

                  (i) the provisions of this Section 4.02(b) shall be in full
      force and effect;

                  (ii) the Trust and the Trustee shall be entitled to deal with
      the Clearing Agency for all purposes of this Trust Agreement (including
      the payment of Dividends on the Global Certificate and receiving
      approvals, votes or consents hereunder) as the Holder of the Trust
      Preferred Securities and the sole Holder of the Global Certificate, and
      shall have no obligation to the Owners;

                  (iii) to the extent that the provisions of this Section
      4.02(b) conflict with any other provisions of this Trust Agreement, the
      provisions of this Section 4.02(b) shall control; and

                  (iv) the rights of the Owners shall be exercised only through
      the Clearing Agencies and shall be limited to those established by law and
      agreements between such Owners and the relevant Clearing Agency and/or the
      Clearing Agency Participants, and the Clearing Agency shall receive and
      transmit payments of Dividends on the Global Certificate to such Clearing
      Agency Participants. The Clearing Agency will make book-entry transfers
      among the Clearing Agency Participants; provided, that solely for the
      purposes of determining whether the Holders of the requisite amount of
      Trust Preferred Securities have voted on any matter provided for in this
      Trust Agreement, so long as Definitive Trust Preferred Securities
      Certificates have not been issued to the Owners pursuant to Section
      4.03(c), the Trustee may conclusively rely on, and shall be fully
      protected in relying on, any written instrument (including a proxy)
      delivered to the Trustee by any Clearing Agency setting forth the Owners'
      votes or assigning the right to vote on any matter to any other Persons
      either in whole or in part.

            (c) Notices to Clearing Agency. Whenever a notice or other
communication to the Holders is required under this Trust Agreement, unless and
until Definitive Trust Preferred Securities Certificates shall have been issued
to the Owners pursuant to Section 4.03(c), the Trustee shall give all such
notices and communications specified herein to be given to the Holders to the
Clearing Agency, and shall have no notice obligations to the Owners except that
for as long as the Trust Preferred Securities are listed on the Luxembourg Stock
Exchange, all notices regarding the Trust Preferred Securities shall be
published in English in one leading daily newspaper with circulation in
Luxembourg (which is expected to be the Luxemburger Wort) as long as such
publication is required under the rules of the Luxembourg Stock Exchange.


                                      -11-
<PAGE>   17
            (d) Appointment of Successor Clearing Agency. If any Clearing Agency
elects to discontinue its services as securities depositary with respect to the
Trust Preferred Securities, the Grantor and the Trust shall use their best
efforts to appoint a successor Clearing Agency with respect to the Trust
Preferred Securities.

            Section 4.03. Registration, Transfer and Exchange of Trust Preferred
Securities.

            (a) The Trustee shall cause a Register (the "Register") to be kept
at the office of the Registrar in which, subject to such reasonable regulations
as the Trustee and the Registrar may prescribe, the Trustee shall provide for
the registration of Trust Preferred Securities and of transfers and exchanges of
Trust Preferred Securities as herein provided. In the absence of appointing a
third party, the Trustee shall serve as the Registrar. The Grantor may remove
the Registrar and, upon removal or resignation of the Registrar, appoint a
successor Registrar. Subject to the terms and conditions of this Trust
Agreement, the Registrar shall register the transfers on the Register from time
to time of Trust Preferred Securities upon any surrender thereof by the Holder
in person or by a duly authorized attorney, properly endorsed or accompanied by
a properly executed instrument of transfer or endorsement, together with
evidence of the payment of any transfer taxes as may be required by law. Upon
such surrender, the Trustee shall execute a new Trust Preferred Security
representing the same corresponding amount of Company Preferred Securities in
accordance with Section 4.01(e) and deliver the same to or upon the order of the
Person entitled thereto.

            (b) At the option of a Holder, Trust Preferred Securities may be
exchanged for other Trust Preferred Securities representing the same
corresponding amount of Company Preferred Securities. Upon surrender of a Trust
Preferred Security at the office of the Registrar or such other office as the
Trustee may designate for the purpose of effecting an exchange of Trust
Preferred Securities, subject to the conditions to transfer set forth in this
Trust Agreement, the Trustee shall execute and deliver a new Trust Preferred
Security representing the same corresponding amount of Company Preferred
Securities as the Trust Preferred Security surrendered.

            As a condition precedent to the registration of the transfer or
exchange of any Trust Preferred Security, the Registrar may require (i)
production of proof satisfactory to it as to the identity and genuineness of any
signature; (ii) compliance with such regulations, if any, as the Trustee or the
Registrar may establish not inconsistent with the provisions of this Trust
Agreement; and (iii) such other information as the Registrar may reasonably
request.

            No Holder may require the transfer of any Trust Preferred Security
to be registered during the period of fifteen days ending on the due date for
any payment of principal on the Trust Preferred Securities. The Trust shall not
be required to register, or cause others to register, the transfer of Trust
Preferred Securities after such Trust Preferred Securities have been called for
redemption.


                                      -12-
<PAGE>   18
            Registration of transfers of Trust Preferred Securities, including
Trust Preferred Securities Certificates, shall be made without change by the
Trust, but the transferor must pay any tax or governmental charge that may be
imposed in relation to the transfer, together with any indemnity that the Trust
or the Bank or the Transfer Agent may require.

            (c) The Global Certificate is exchangeable for Definitive Trust
Preferred Security Certificates in registered form if DTC: (i) notifies the
Trust that it is unwilling or unable to continue as depositary for the Global
Certificate and the Trust does not appoint a successor depositary or (ii) has
ceased to be a clearing agency registered under the Securities Exchange Act of
1934. Upon surrender of the Global Certificates by the Clearing Agency,
accompanied by registration instructions, the Grantor will cause to be prepared
for delivery to the Owners the Definitive Trust Preferred Certificates in
accordance with instructions of the Clearing Agency.

            Definitive Trust Preferred Securities Certificates may be
transferred in any whole- number multiples of $25 by surrendering the Definitive
Trust Preferred Securities Certificates, together with the form of transfer
endorsed on it, duly completed and executed, at the specified office of the
Transfer Agent. The initial Transfer Agent shall be Wilmington Trust Company. As
long as the Trust Preferred Securities are listed on the Luxembourg Stock
Exchange, the Trust shall also maintain a Transfer Agent in Luxembourg. The
initial Luxembourg Transfer Agent shall be BNP Paribas. If only part of a
Definitive Trust Preferred Securities Certificate is transferred, a new
Definitive Trust Preferred Securities Certificate representing the securities
not transferred shall be issued to the transferor within three business days
after the Transfer Agent receives the certificate. The new Definitive Trust
Preferred Securities Certificate representing the Trust Preferred Securities
that were not transferred shall be delivered to the transferor by uninsured mail
at the risk of the transferor, to the address of the transferor that appears in
the Register. The new Definitive Trust Preferred Securities Certificate
representing the Trust Preferred Securities that were transferred shall be sent
to the transferee within three business days after the Trustee receives the
surrendered Definitive Trust Preferred Securities Certificate by uninsured mail
at the risk of the Holder entitled to the Definitive Trust Preferred Securities
Certificate, to the address specified on the form of transfer.

            All transfers of Definitive Trust Preferred Securities Certificates
and entries shall be made as provided in the Registrar and Transfer Agency
Agreement, among the Trust and the Registrar and Transfer Agents, relating to
the Trust Preferred Securities.

            Section 4.04. Lost or Stolen Trust Preferred Securities, Etc. If (i)
any mutilated Trust Preferred Security shall be surrendered to the Registrar, or
if the Registrar shall receive evidence to its satisfaction of the destruction,
loss or theft of any Trust Preferred Security, and (ii) there shall be delivered
to the Registrar and the Grantor such security or indemnity as may be required
by them to hold each of them harmless, then in the absence of notice that such
Trust Preferred Security shall have been acquired by a bona fide purchaser or,
as applicable, any

                                      -13-
<PAGE>   19
protected purchaser, the Grantor shall sign and make available for delivery, in
exchange for or in lieu of any mutilated, destroyed, lost or stolen Trust
Preferred Security, a new Trust Preferred Security representing the same amount
of corresponding Company Preferred Securities. In connection with the issuance
of any new Trust Preferred Security, the Grantor may require the payment of a
sum sufficient to cover any tax or other governmental charge that may be imposed
in connection therewith. Any duplicate Trust Preferred Security issued pursuant
to this Section shall constitute conclusive evidence of a Trust Preferred
Security corresponding to that evidenced by the lost, stolen or destroyed Trust
Preferred Security, as if originally issued, whether or not the lost, stolen or
destroyed Trust Preferred Security shall be found at any time.

            Section 4.05. Cancellation and Destruction of Surrendered
Certificates. All Trust Preferred Securities surrendered to the Trustee shall be
canceled by the Trustee. Except as prohibited by applicable law or regulation,
the Trustee may destroy such canceled Trust Preferred Securities or otherwise
dispose of them in accordance with its usual practices.

            Section 4.06. Surrender of Trust Preferred Securities and Withdrawal
of Company Preferred Securities. Any Person who is the beneficial owner (an
"Owner") of the Trust Preferred Securities represented by the Global
Certificates held by DTC or a successor clearing agency (the "Clearing Agency")
or, if a participant in the Clearing Agency is not the Owner, then as reflected
in the records of a Person maintaining an account with such Clearing Agency
(directly or indirectly), in accordance with the rules of such Clearing Agency,
may withdraw all, but not less than all, of the Company Preferred Securities
represented by such Trust Preferred Securities by providing a written notice to
the Trustee, with evidence of beneficial ownership in form satisfactory to the
Trustee, and providing to the Grantor such documents or information as the
Grantor may request for tax reporting purposes, at the Corporate Office or at
such other office as the Trustee may designate for such withdrawals, all in form
satisfactory to the Trustee, in its sole discretion. The Owner's notice shall
also be deemed to be such Owner's agreement to be subject to the terms of the
LLC Agreement applicable to the rights of holders of the Company Preferred
Securities.

            Within a reasonable period after such a request has been properly
made, the Trustee shall instruct DTC to reduce the Trust Preferred Securities
represented by the Global Certificate by the corresponding amount of the Company
Preferred Securities to be so withdrawn by the withdrawing Owner. The Grantor
shall issue to the withdrawing Owner a Company Preferred Securities Certificate
representing the amount of the Company Preferred Securities so withdrawn, and
the Trustee, on behalf of the Trust, shall instruct DTC to reduce the amount of
Trust Preferred Securities represented by the Global Certificate held by DTC by
such amount.

            Any Owner who wishes to withdraw the Company Preferred Securities in
accordance with this Section 4.06 shall be required to provide the Grantor with
a completed Internal Revenue Service Form W-9 or W-8, as appropriate, and/or
such other documents or information as are requested by the Grantor for tax
reporting purposes and thereafter shall be


                                      -14-
<PAGE>   20
admitted to the Grantor as a member of the Grantor upon such Owner's receipt of
a Company Preferred Securities Certificate registered in such Owner's name.

            The Trustee shall deliver the appropriate number of Company
Preferred Securities Certificates in exchange for the Trust Preferred Securities
surrendered in accordance with this Section 4.06 to the Owner at the Corporate
Office, except that, at the request, risk and expense of the Owner and for the
account of the Owner, such delivery may be made at such other place as may be
designated by such Owner. The Trustee shall only deliver such Company Preferred
Securities Certificates upon payment by such Owner to the Trustee of all taxes
and other governmental charges and any fees (including the fees and expenses of
the Trustee and its counsel) payable in connection with such delivery and the
transfer of such Company Preferred Securities Certificates.

            Notwithstanding anything in this Section 4.06 to the contrary, if
the Company Preferred Securities exchangeable for Trust Preferred Securities
have been called for redemption in accordance with the LLC Agreement, no Owner
of such Trust Preferred Securities may withdraw any or all of the Company
Preferred Securities represented by such Trust Preferred Securities.

            Section 4.07. Redeposit of Company Preferred Securities. Any Holder
of Company Preferred Securities may redeposit withdrawn Company Preferred
Securities by delivering to the Trustee the Company Preferred Securities
Certificate for the Company Preferred Securities to be deposited, which are (i)
if required by the Trustee, properly endorsed or accompanied by a properly
executed instrument of transfer or endorsement in form satisfactory to the
Trustee and in compliance with the terms of the LLC Agreement and (ii)
accompanied by all such certifications as may be required by the Trustee in its
sole discretion and in accordance with the provisions of this Trust Agreement.
Within a reasonable period after such deposit is properly made, the Trustee
shall instruct DTC to increase the amount of Trust Preferred Securities
represented by the Global Certificate held by DTC by an amount equal to the
Company Preferred Securities so deposited. The Trustee shall only accept the
redeposit of such Company Preferred Securities upon payment by such Holder of
the Company Preferred Securities to the Trustee of all taxes and other
governmental charges and any fees and expenses (including the fees and expenses
of the Trustee and its counsel) payable in connection with such deposit and the
transfer of the deposited Company Preferred Securities.


                                      -15-
<PAGE>   21
            If required by the Trustee, Company Preferred Securities
Certificates presented for redeposit at any time shall also be accompanied by an
agreement or assignment, or other instrument satisfactory to the Trustee, that
shall provide for the prompt transfer to the Trustee or its nominee of any
distribution or other right that any Person in whose name the Company Preferred
Securities Certificates are registered may thereafter receive upon or in respect
of such deposited Company Preferred Securities, or in lieu thereof such
agreement of indemnity or other agreement as shall be satisfactory to the
Trustee.

            Section 4.08. Filing Proofs, Certificates and Other Information. Any
Person presenting Company Preferred Securities Certificates for redeposit in
accordance with Section 4.06 may be required from time to time to file such
proof of residence or other information, to execute such certificates and to
make such representations and warranties as the Trustee may reasonably deem
necessary or proper.


                                    ARTICLE V
                    DISTRIBUTIONS AND OTHER RIGHTS OF HOLDERS
                          OF TRUST PREFERRED SECURITIES

            Section 5.01. Periodic Distributions. Whenever (and to the extent)
the Trust receives any cash payments representing a Dividend or redemption
payment on the Company Preferred Securities, or payments from the Bank pursuant
to the Subordinated Guarantee in respect of such Dividend or redemption payment,
the Trustee acting directly or through any Paying Agent shall distribute such
amounts to Holders of the Trust Preferred Securities on the record date fixed
pursuant to Section 5.04, in proportion to the respective liquidation amount of
Trust Preferred Securities held by such Holders.

            Section 5.02. Redemptions of Company Preferred Securities. The Trust
Preferred Securities shall be redeemed only upon redemption of the Company
Preferred Securities.

            If the Grantor redeems the Company Preferred Securities in
accordance with the LLC Agreement, then the Grantor shall give the Trustee at
least 30 days' prior notice before doing so. The Trustee shall mail the notice
of the redemption not less than 25 days prior to the date fixed for redemption
(the "Redemption Date") of the Company Preferred Securities to the Holders of
the Trust Preferred Securities as provided under Section 8.04. No defect in the
notice of redemption or in the mailing or delivery thereof shall affect the
validity of the redemption proceedings. The Grantor shall provide the Trustee
with such notice, and each such notice shall state: (i) the Redemption Date,
(ii) the redemption price at which the Trust Preferred Securities and the
Company Preferred Securities are to be redeemed, (iii) that all outstanding
Trust Preferred Securities are to be redeemed or, in the case of a redemption of
fewer than all outstanding Trust Preferred Securities in connection with a
partial redemption of the Company Preferred Securities, the amount of such Trust
Preferred Securities to be so redeemed and (iv) the


                                      -16-
<PAGE>   22
place or places where Trust Preferred Securities to be redeemed are to be
surrendered for redemption.

            If only some of the outstanding Trust Preferred Securities are to be
redeemed, the Trust Preferred Securities to be redeemed shall be selected in
accordance with DTC's procedures. If the Trust Preferred Securities do not
remain registered in the name of DTC or its nominee and only some of the
outstanding Trust Preferred Securities are to be redeemed, the Trust Preferred
Securities shall be redeemed proportionally or selected for redemption pursuant
to the rules of any securities exchange on which the Trust Preferred Securities
are listed at that time. The Grantor shall promptly notify the Registrar and
Transfer Agent, in writing, of the Trust Preferred Securities selected for
redemption.

            The Grantor agrees that if a partial redemption of the Company
Preferred Securities would result in a delisting of the Trust Preferred
Securities from any securities exchange on which the Trust Preferred Securities
are then listed, the Grantor shall only redeem the Company Preferred Securities
in whole.

            On the date of redemption of the Company Preferred Securities, so
long as the Company or the Bank has deposited with Wilmington Trust Company, the
Paying Agent, on behalf of the Trust the aggregate amount payable upon
redemption of all the Company Preferred Securities held by the Trust to be
redeemed, the Paying Agent on behalf of the Trust shall irrevocably deposit with
DTC funds sufficient to pay the redemption price and give DTC irrevocable
instructions to pay the redemption price to the Holders of the Trust Preferred
Securities to be redeemed.

            Once the Paying Agent has received this deposit, all rights of the
Holders of the Trust Preferred Securities called for redemption shall end,
except their right to receive the redemption price, without interest. If any
date fixed for redemption of the Trust Preferred Securities is not a Business
Day, then the redemption price shall instead be paid on the next Business Day,
except that if that Business Day falls in the next calendar year, the redemption
price shall be paid on the preceding Business Day. No interest or other payment
shall be due as a result of any such adjustment.

            Section 5.03. Distributions in Liquidation of Grantor. Upon receipt
by the Trust of any Liquidation Preference from the Grantor upon the liquidation
of the Grantor, after satisfaction of creditors of the Trust as required by
applicable law, the Trust shall distribute the same to the Holders of the Trust
Preferred Securities on the record date fixed pursuant to Section 4.04, in
proportion to the respective Liquidation Preference of the Company Preferred
Securities which were exchangeable for the Trust Preferred Securities held by
such Holders.

            Section 5.04. Fixing of Record Date for Holders of the Trust
Preferred Securities. Each distribution on the Trust Preferred Securities in
respect of Dividends on the Company


                                      -17-
<PAGE>   23
Preferred Securities (each a "Regular Distribution") shall be payable to the
Holders as they appear on the Register on the corresponding record date. The
record date for Regular Distributions is the fifteenth calendar day prior to the
relevant distribution date. Whenever any other distribution shall become
payable, or whenever the Trustee shall receive notice of any meeting at which
Holders of the Company Preferred Securities are entitled to vote or of which
Holders of the Company Preferred Securities are entitled to notice, the Trustee
shall in each such instance fix a record date (which shall be the same date as
the record date fixed by the Grantor with respect to the Company Preferred
Securities, of which the Grantor shall promptly inform the Trustee) for the
determination of the Holders of the Trust Preferred Securities who shall be
entitled (i) to receive such distribution, or (ii) to receive notice of, and to
give instructions for the exercise of voting rights at, any such meeting.

            Section 5.05. Payment of Distributions. The Trust shall maintain a
Paying Agent with respect to the Trust Preferred Securities, which shall
initially be Wilmington Trust Company. The Paying Agent shall be permitted to
resign as Paying Agent upon 30 days' written notice to the Trustee. If
Wilmington Trust Company resigns as Paying Agent, the Trustee shall appoint
another bank or trust company to act as Paying Agent. As long as the Trust
Preferred Securities are listed on the Luxembourg Stock Exchange, the Trust
shall also maintain a Paying Agent in Luxembourg. The initial Luxembourg Paying
Agent shall be BNP Paribas.

            As long as the Trust Preferred Securities are in book-entry form,
payments on the Trust Preferred Securities shall be made to DTC, which shall
credit the relevant accounts at DTC on the scheduled payment dates. The payments
shall be distributed to participants, indirect participants and beneficial
owners of the Trust Preferred Securities in accordance with DTC's procedures.

            If Definitive Trust Preferred Securities Certificates are issued as
described in Section 4.03(c), payments on the Trust Preferred Securities shall
be made by check mailed to the address of the Holder entitled to receive the
payment, as such address appears in the Register.

            Payments of the redemption price of, and distributions in
liquidation on, Trust Preferred Securities shall be made upon surrender of such
Trust Preferred Securities at the office of the Paying Agent. The Grantor shall
pay Dividends on, the redemption price of, and Liquidation Preferences on, the
Company Preferred Securities directly to the Paying Agent for distribution to
the Holders of the Trust Preferred Securities in accordance with the terms of
this Trust Agreement and the paying agency agreement as then in effect with the
Paying Agent.

            If any distributions on the Trust Preferred Securities would be
payable on a day that is not a Business Day, that distribution shall instead be
made on the next Business Day. No interest or other payment shall be due as a
result of any such delay.


                                      -18-
<PAGE>   24
            Section 5.06. Voting Rights. If at any time, the holders of Company
Preferred Securities are entitled to vote under the LLC Agreement, the Trustee
shall: (i) notify the Holders of the Trust Preferred Securities of such right,
(ii) request specific direction from each Holder as to the vote with respect to
the Company Preferred Securities represented by such Holder's Trust Preferred
Securities, and (iii) vote the relevant Company Preferred Securities only in
accordance with such specific direction.

            Upon receiving notice of any meeting at which the holders of Company
Preferred Securities are entitled to vote, the Trustee shall, as soon as
practicable, mail to the Holders of the Trust Preferred Securities a notice as
provided under Section 8.04. The Company shall provide the form of notice to the
Trustee to be forwarded to the Holders of the Trust Preferred Securities. The
notice shall contain: (i) all the information that is contained in the notice
announcing the meeting of the Company Preferred Securities, (ii) a statement
that the Holders of the Trust Preferred Securities shall be entitled, subject to
any applicable provision of law, to direct the Trustee specifically as to the
exercise of the voting rights pertaining to the number of the Company Preferred
Securities represented by their respective Trust Preferred Securities, and (iii)
a brief description of the manner in which the Holders of the Trust Preferred
Securities may give such specific directions.

            If the Trust receives a written direction from a Holder, the Trustee
shall vote, or cause to be voted, the number of Company Preferred Securities
corresponding to such Holder's Trust Preferred Securities in accordance with the
instructions set forth in the direction. If the Trustee does not receive
specific instructions from any Holder, the Trustee shall abstain from voting the
Company Preferred Securities corresponding to such Holder's Trust Preferred
Securities.

            The Grantor hereby agrees to take all reasonable action that may be
deemed necessary by the Trustee in order to enable the Trustee to vote such
Company Preferred Securities or cause such Company Preferred Securities to be
voted.

            Section 5.07. Currency. All distributions and other payments and all
other monetary rights and obligations in respect of the Trust Preferred
Securities shall be performed in U.S. dollars.


                                   ARTICLE VI
                                   THE TRUSTEE

            Section 6.01. Eligibility. The Trust shall at all times have a
Trustee that is not an Affiliate of the Grantor and is a bank that is organized
and doing business under the laws of the State of Delaware, authorized under
such laws to exercise corporate trust powers, having a combined capital and
surplus of at least [$50,000,000] and subject to supervision or examination


                                      -19-
<PAGE>   25
by Federal or State authority. If such bank publishes reports of conditions at
least annually, pursuant to law or to the requirements of Federal or State
supervising or examining authority, then for the purposes of this Section 6.01,
the combined capital and surplus of such bank shall be deemed to be its combined
capital and surplus as set forth in its most recent report of conditions so
published.

            If the Trustee ceases to be eligible in accordance with the
provisions of this Section 6.01, the Trustee shall resign immediately in the
manner and with the effect specified in Section 6.03.

            If the Trustee has or shall acquire any "conflicting interest"
within the meaning of Section 310(b) of the Trust Indenture Act, the Trustee and
the Grantor (as if it were the obligor referred to in Section 310(b) of the
Trust Indenture Act) shall in all respects comply with the provisions of Section
310(b) of the Trust Indenture Act.

            The Trustee shall make available for inspection by Holders of the
Trust Preferred Securities at the Corporate Office and at such other places as
it may from time to time deem advisable during normal business hours any reports
and communications received from the Grantor by the Trustee as the holder of the
Company Preferred Securities.

            Promptly upon request from time to time by the Grantor, the Trustee
shall cause the Registrar to furnish to it a list as of a recent date, of the
names, addresses and holdings of all Persons in whose names Trust Preferred
Securities are registered on the Register.

            Section 6.02. Obligations of the Trustee.

            (a) The Trustee, before the occurrence of any default with respect
to the Trust Preferred Securities and after the curing or waiver of all such
defaults that may have occurred, shall undertake to perform only such duties as
are specifically set forth in this Trust Agreement and no implied covenants
shall be read into this Trust Agreement against the Trustee. In case a default
with respect to the Trust Preferred Securities has occurred (that has not been
cured or waived pursuant to Section 2.06) of which an officer of the Trustee has
actual knowledge, the Trustee shall exercise such of the rights and powers
vested in it by this Trust Agreement, and use the same degree of care and skill
in their exercise, as a prudent person would exercise or use under the
circumstances in the conduct of his or her own affairs. Subject to these
requirements, the Trustee shall be under no obligation to exercise any of the
powers vested in it by this Trust Agreement at the request of any Holder, unless
such Holder offers the Trustee reasonable indemnity against all costs, expenses
and liabilities that might be incurred by exercising those powers.


                                      -20-
<PAGE>   26
            (b) No provision of this Trust Agreement shall be construed to
relieve the Trustee from liability for its own negligent action, its own
negligent failure to act, or its own willful misconduct, except that:

                  (i) prior to the occurrence of a default with respect to the
      Trust Preferred Securities and after the curing or waiving of all such
      defaults that may have occurred:

                        (A) the duties and obligations of the Trustee shall be
            determined solely by the express provisions of this Trust Agreement
            and the Trustee shall not be liable except for the performance of
            such duties and obligations as are specifically set forth in this
            Trust Agreement, and no implied covenants or obligations shall be
            read into this Trust Agreement against the Trustee; and

                        (B) in the absence of bad faith on the part of the
            Trustee, the Trustee may conclusively rely, as to the truth of the
            statements and the correctness of the opinions expressed therein,
            upon any certificates or opinions furnished to the Trustee and
            conforming to the requirements of this Trust Agreement; provided
            that in the case of any such certificates or opinions that by any
            provision hereof are specifically required to be furnished to the
            Trustee, the Trustee shall be under a duty to examine the same to
            determine whether or not they conform to the requirements of this
            Trust Agreement, but need not confirm or investigate the accuracy of
            any mathematical calculations or other facts stated therein;

                  (ii) the Trustee shall not be liable for any error of judgment
      made in good faith by an officer of the Trustee, unless it shall be proved
      that the Trustee was negligent in ascertaining the pertinent facts;

                  (iii) the Trustee shall not be liable with respect to any
      action taken or omitted to be taken by it in good faith in accordance with
      the direction of the Holders of not less than 50% in liquidation amount of
      the Trust Preferred Securities relating to the time, method and place of
      conducting any proceeding for any remedy available to the Trustee, or
      exercising any trust or power conferred upon the Trustee under this Trust
      Agreement; and

                  (iv) the Trustee's sole duty with respect to the custody safe
      keeping and physical preservation of the Company Preferred Securities, the
      Subordinated Guarantee and the Trust Preferred Securities shall be to deal
      with such property in a similar manner as the Trustee deals with similar
      property for its own account, subject to the protections and limitations
      on liability afforded to the Trustee under this Trust Agreement and the
      Trust Indenture Act.


                                      -21-
<PAGE>   27
            (c)   The Trustee shall:

                  (i) cause its authorized signatories to execute and deliver on
      behalf of the Trust: (1) the Paying Agency Agreement, dated -, 2001,
      among the Company, the Trust, and Paying Agent, (2) the Registrar and
      Transfer Agency Agreement, dated -, 2001, among the Trust, Wilmington
      Trust Company and BNP Paribas, as Registrar and Transfer Agents for the
      Trust Preferred Securities, (3) the global certificate in respect of the
      Trust Preferred Securities, and (4) any and all additional documents as
      may be desirable in connection with the offering of the Trust Preferred
      Securities representing the Company Preferred Securities; and

                  (ii) cause its authorized signatories to execute and deliver:
      (1) a Certificate of the Trustee, dated -, 2001, pursuant to Section
      5(i) of the Underwriting Agreement, and (ii) a Certificate of the Trustee,
      dated -, 2001, attaching the Trust Agreement as may be amended from time
      to time and stating that the signatures on documents signed by the Trustee
      on behalf of the Trust are authorized and genuine.

            The Grantor may instruct the Trustee to dissolve the Trust and
distribute the Trust Estate on a pro rata basis to the Holders of the Trust
Preferred Securities in the case of either a Tax Event as to the Trust or an
Investment Company Act Event as to the Trust, as such is defined in the LLC
Agreement.

            In the event that the Trustee is uncertain as to application or
interpretation of any provision of this Trust Agreement or must choose between
alternative courses of action, the Trustee may seek the instructions of the
Grantor by written notice requesting instructions. The Trustee shall take and be
protected in taking such action as has been directed by the Grantor; provided
that, if the Trustee does not receive instructions within ten days or such
shorter time as is set forth in such notice, the Trustee shall be under no duty
to take or refrain from taking such action and shall be fully protected in any
course of action taken by it in good faith not inconsistent with this Trust
Agreement as it shall deem advisable and in the interest of the Holders of the
Trust Preferred Securities.

            The Trustee and its Affiliates may own, buy, sell or deal in any
class of securities of the Grantor and its Affiliates and in Trust Preferred
Securities or become pecuniarily interested in any transaction in which the
Grantor or its Affiliates may be interested or contract with or lend money to or
otherwise act as fully or as freely as if it were not the Trustee hereunder. The
Trustee may also act as transfer agent or registrar of any of the securities of
the Grantor and its Affiliates or act in any other capacity for the Grantor or
its Affiliates.

            The Trustee (and its officers, directors, employees and agents)
makes no representation nor shall it have any liability for or responsibility
with respect to the issuance of the Trust Preferred Securities (except for its
counter-signatures thereon) or any instruments


                                      -22-
<PAGE>   28
referred to therein or herein, or as to the correctness of any statement made
therein or herein; provided, however, that the Trustee is responsible for its
representations and warranties in the last paragraph of this Section 6.02.

            The Trustee assumes no responsibility for the correctness of the
description that appears in the Trust Preferred Securities, which can be taken
as a statement of the Grantor summarizing certain provisions of this Trust
Agreement. Notwithstanding any other provision herein or in the Trust Preferred
Securities, the Trustee makes no warranties or representations as to the
validity, genuineness or sufficiency of the Trust Preferred Securities, as to
the validity or sufficiency of this Trust Agreement, as to the value of the
Trust Preferred Securities or as to any right, title or interest of the Holders
of the Trust Preferred Securities, except that the Trustee hereby represents and
warrants as follows: (i) the Trustee has been duly organized and is validly
existing and in good standing under Delaware law, with full power, authority and
legal right under such laws to execute, deliver and carry out the terms of this
Trust Agreement; (ii) this Trust Agreement has been duly authorized, executed
and delivered by the Trustee; and (iii) this Section 5.02 constitutes a valid
and binding obligation of the Trustee enforceable against the Trustee in
accordance with its terms subject to equitable principles and bankruptcy,
insolvency, moratorium, receivership and other similar laws affecting the
enforcement of creditors' rights generally. Notwithstanding anything herein or
in any other document to the contrary, to the maximum extent provided in Section
3803(b) of the Business Trust Act, a trustee of the Trust, when acting in such
capacity, shall not be personally liable to any Person other than the Trust and
the beneficial owners thereof for any act, omission or obligation of the Trust
or any other trustee or other agent or representative of the Trust.

            In the exercise or administration of the trusts hereunder, the
Trustee (i) may act directly or, at the expense of the Trust, through agents or
attorneys, and the Trustee shall not be liable for the default or misconduct of
such agents or attorneys if such agents or attorneys shall have been selected by
the Trustee in good faith, and (ii) may, at the expense of the Trust, consult
with counsel, accountants and other experts, and it shall not be liable for
anything done, suffered or omitted in good faith by it in accordance with the
advice or opinion of any such counsel, accountants or other experts.

            Section 6.03. Resignation and Removal of the Trustee; Appointment of
Successor Trustee. The Trustee may resign as Trustee at any time by giving
notice of its resignation to the Grantor. The Trustee may be removed by the
Grantor at any time by notice of such removal delivered to the Trustee. Any
resignation or removal of the Trustee shall take effect upon the appointment of
a qualified successor trustee and the successor's acceptance of such appointment
as hereinafter provided.


                                      -23-
<PAGE>   29
            If the Trustee shall resign or be removed, the Grantor shall, within
45 days after the delivery of the notice of resignation or removal, as the case
may be, appoint a successor trustee, which shall be a bank or trust company, or
an affiliate of a bank or trust company, having its principal office in the
State of Delaware and having a combined capital and surplus of at least
$50,000,000.

            If a successor Trustee shall not have been appointed in 45 days, the
resigning Trustee may petition a court of competent jurisdiction to appoint a
successor trustee, and the expenses of such proceeding shall be borne by the
Grantor. Every successor trustee shall execute and deliver to its predecessor
and to the Grantor an instrument in writing accepting its appointment hereunder,
and thereupon the resigning or removed Trustee shall be fully released and
discharged of the trusts and duties of the Trustee hereunder and such successor
trustee, without any further act or deed, shall become fully vested with all the
rights, powers, duties and obligations of its predecessor and for all purposes
shall be the Trustee under this Trust Agreement, and such predecessor, upon
payment of all sums due it and on the written request of the Grantor, shall
promptly execute and deliver an instrument transferring to such successor all
rights and powers of such predecessor hereunder, shall duly assign, transfer and
deliver all rights, title and interest in the Company Preferred Securities and
any moneys or property held hereunder to such successor and shall deliver to
such successor a list of the Holders of all outstanding Trust Preferred
Securities. Any successor Trustee shall promptly mail notice of its appointment
to the Holders of the Trust Preferred Securities.

            Any Person into or with which the Trustee may be merged,
consolidated or converted, or any Person succeeding to the corporate trust
business of the Trustee, shall be the successor of such Trustee without the
execution or filing of any document or any further act, provided such Person
shall be eligible under the provisions of the immediately preceding paragraph.

            Section 6.04. Notices. The Grantor agrees that it shall give timely
notice to the Trustee and any Paying Agent of any record date for the Company
Preferred Securities Certificates, which record date shall become the record
date with respect to the Trust Preferred Securities pursuant to Section 5.04.

            Notices to the Holders of the Trust Preferred Securities shall be
given as described in Section 8.04.

            Section 6.05. Status of Trust. It is intended that the Trust shall
constitute a grantor trust under the Internal Revenue Code of 1986, as amended,
and shall not be an "investment company" under the Investment Company Act of
1940, as amended. The Guarantor agrees to file all tax returns and reports on
behalf of the Trust.


                                      -24-
<PAGE>   30
            Section 6.06. Appointment of Grantor to File on Behalf of Trust. The
Grantor and the Trustee hereby appoint, authorize and direct the Grantor, if the
Grantor deems it necessary, appropriate or convenient to do, as the sponsor and
agent of the Trust pursuant to Section 3806(b)(7) of the Business Trust Act (and
any of the following are hereby confirmed if such action has been taken) (i) to
prepare or cause the preparation of, and file, a Registration Statement relating
to the offer and sale of the Trust Preferred Securities; (ii) to file and
execute on behalf of the Trust such applications, reports, surety bonds,
irrevocable consents, appointments of attorney for service of process, and other
papers and documents as the Grantor, on behalf of the Trust, may deem necessary
or desirable to register the Trust Preferred Securities under, or obtain for the
capital securities an exemption from, the securities "Blue Sky" laws; (iii) to
execute on behalf of the Trust such underwriting or purchase or placement agent
agreements with one or more underwriters or managers or placement agents
relating to the offering of the Trust Preferred Securities of the Trust; (iv) to
execute on behalf of the Trust any and all documents, papers and instruments as
may be desirable in connection with any of the foregoing; and (v) to file and
execute on behalf of the Trust, such applications, reports, surety bonds,
irrevocable consents, appointments of attorney for service of process and other
papers and documents that shall be necessary or desirable to register establish
the exemption from registration of the Trust Preferred Securities under the
securities or "Blue Sky" laws of such jurisdictions as the Grantor, on behalf of
the Trust, may deem necessary or desirable. In the event that any filing
referred to in this paragraph is required by the rules and regulations of any
state securities or Blue Sky laws to be executed on behalf of the Trust by the
Trustee or the Grantor, the Trustee, in its capacity as trustee of the Trust,
and the Grantor are hereby authorized and directed to join in any such filing
and to execute on behalf of the Trust any and all of the foregoing, it being
understood that the Trustee, in its capacity as trustee of the Trust, shall not
be required to join in any such filing or execute on behalf of the Trust any
such document unless required by the rules and regulations of such state
securities or "Blue Sky" laws.

            Section 6.07. Indemnification by the Grantor. To the fullest extent
permitted by law, the Grantor and the Bank, jointly and severally, agree to
indemnify and defend the Trustee, the Registrar and any Paying Agent and their
directors, officers, employees and agents against, and hold each of them
harmless from, any liability, costs and expenses (including reasonable
attorneys' fees) that may arise out of or in connection with its acting as the
Trustee or the Registrar, transfer agent or Paying Agent, respectively, under
this Trust Agreement and the Trust Preferred Securities, except for any
liability arising out of gross negligence, bad faith or willful misconduct on
the part of any such Person or Persons. This Section 6.07 and Section 6.08 and
the obligations of the Grantor and the Bank thereunder shall survive the
termination of the Trust and this Agreement.

            Section 6.08. Fees, Charges and Expenses. All changes or expenses of
the Trust, including the charges or expenses of the Trustee or any Trustee's
agent hereunder or of any Registrar, shall be paid by the Stamford branch of UBS
AG, except that, if the Trustee incurs fees, charges or expenses for which it is
not otherwise liable under this Trust Agreement at the


                                      -25-
<PAGE>   31
request of a Holder or other Person, such Holder or other Person shall be liable
for such fees, charges and expenses.

            Section 6.09.  Appointment of Co-Trustee or Separate Trustee.

            (a) Notwithstanding any other provisions of this Trust Agreement, at
any time, for the purpose of meeting any legal requirements of any jurisdiction
in which any property of the Trust must at the time be located, the Trustee
shall have the power and may execute and deliver all instruments to appoint one
or more Persons to act as co-trustee or co-trustees, or separate trustee or
separate trustees, of all or any part of the Trust, and to vest in such Person
or Persons, in such capacity and for the benefit of the Holders of the Trust
Preferred Securities, such title to the Trust, or any part thereof, and, subject
to the other provisions of this Section 6.09, such powers, duties, obligations,
rights and trusts as the Trustee may consider necessary or desirable. No
co-trustee or separate trustee hereunder shall be required to meet the terms of
eligibility as successor trustee under Section 6.03 and no notice to the Holders
of the Trust Preferred Securities of the appointment of any co-trustee or
separate trustee shall be required.

            (b) Every separate trustee and co-trustee shall, to the extent
permitted by law, be appointed and act subject to the following provisions and
conditions:

                  (i) all rights, powers, duties and obligations conferred or
      imposed upon and exercised or performed by the Trustee shall be exercised
      or performed by the Trustee and such separate trustee or co-trustee
      jointly (it being understood that such separate trustee or co-trustee is
      not authorized to act separately without the Trustee joining in such act),
      except to the extent that under any laws of any jurisdiction in which any
      particular act or acts are to be performed, the Trustee shall be
      incompetent or unqualified to perform such act or acts, in which event,
      such rights, powers, duties and obligations (including the holding of
      title to the Trust or any portion thereof in any such jurisdiction) shall
      be exercised and performed singly by such separate trustee or co-trustee,
      but solely at the direction of the Trustee;

                  (ii) the Trustee shall be personally liable by reason of any
      act or omission of any separate trustee or co-trustee; and

                  (iii) the Trustee may at any time accept the resignation of or
      remove any separate trustee or co-trustee.

            (c) Any notice, request or other writing given to the Trustee shall
be deemed to have been given to each of the then separate trustees and
co-trustees, as effectively as if given to each of them. Every instrument
appointing any separate trustee or co-trustee shall refer to this Trust
Agreement. Each separate trustee and co-trustee, upon its acceptance of the
trusts conferred, shall be vested with the estates or property specified in its
instrument of appointment,


                                      -26-
<PAGE>   32
either jointly with the Trustee or separately, as may be provided therein,
subject to all the provisions of this Trust Agreement, specifically including
every provision of this Trust Agreement relating to the conduct of, affecting
the liability of, or affording protection to, the Trustee. Every such instrument
shall be filed with the Trustee and a copy thereof given to the Grantor.

            (d) Any separate trustee or co-trustee may at any time constitute
the Trustee as its agent or attorney-in-fact with full power and authority, to
the extent not prohibited by law, to do any lawful act under or in respect to
this Trust Agreement on its behalf and in its name. If any separate trustee or
co-trustee shall die, become incapable of acting, resign or be removed, all of
its estates, properties, rights, remedies and trusts shall vest in and be
exercised by the Trustee, to the extent permitted by law, without the
appointment of a new or successor trustee.


                                   ARTICLE VII
                            AMENDMENT AND TERMINATION

            Section 7.01. Supplemental Trust Agreement. The Grantor and the
Trustee may, at any time and from time to time, without the consent of the
Holders of the Trust Preferred Securities, enter into one or more agreements
supplemental hereto, in form satisfactory to the Trustee, for any of the
following purposes:

            (a) to evidence the succession of another partnership, corporation
or other entity to the Grantor and the assumption by any such successor of the
covenants of the Grantor herein contained; or

            (b) to add to the covenants of the Grantor for the benefit of the
Holders of the Trust Preferred Securities, or to surrender any right or power
herein conferred upon the Grantor; or

            (c) (i) to correct or supplement any provision herein which may be
defective or inconsistent with any other provision herein or (ii) to make any
other provisions with respect to matters or questions arising under this Trust
Agreement, provided that any such action taken under subsection (c)(ii) hereof
shall not materially adversely affect the interests of the Holders of the Trust
Preferred Securities; or

            (d) to cure any ambiguity or correct any mistake.

Any other amendment or agreement supplemental hereto must be in writing and
approved by Holders of 66 2/3% of the then outstanding Trust Preferred
Securities.


                                      -27-
<PAGE>   33
            Section 7.02. Termination. The Trust shall dissolve upon the
earliest to occur of: (i) the redemption of all of the Trust Preferred
Securities, (ii) the delivery of a final distribution of the Company Preferred
Securities to the Holders of the Trust Preferred Securities, (iii) withdrawal of
all of the Company Preferred Securities from the Trust or (iv) dissolution of
the Trust in accordance with the following paragraph or (v) in the event a
liquidation of the Grantor is commenced, as contemplated in Section 5.03 hereof.
The dissolution, winding up and termination of the Trust shall be performed in
accordance with Section 3808 of the Business Trust Act, and the Trustee shall
have the power and authority to wind up the affairs of the Trust in accordance
therewith. This Agreement shall terminate upon the filing of a certificate of
cancellation as provided in Section 3810 of the Business Trust Statute.

            The Grantor may instruct the Trustee to dissolve the Trust and
distribute the Company Preferred Securities on a pro rata basis to the Holders
of the Trust Preferred Securities in the case of either a Tax Event as to the
Trust or an Investment Company Act Event as to the Trust, as each is defined in
the LLC Agreement. Except as provided in Section 6.07 and Section 6.08, upon
termination of the Trust in accordance with the foregoing, the respective
obligations and responsibilities of the Trustee and the Grantor created hereby
shall terminate.

            The Trustee shall notify the Paying Agent and the Holders of the
Trust Preferred Securities of any such amendment or termination of the Trust
Agreement within a reasonable period of time.

            Upon the completion of winding up of the Trust, including the
payment or the making reasonable provisions for payment of all obligations of
the Trust in accordance with Section 3808(e) of the Business Trust Act, the
Trustee shall file a certificate of cancellation with the Delaware Secretary of
State in accordance with Section 3810 of the Business Trust Act, at which time
the Trust shall terminate. The Grantor shall act as the liquidator of the Trust
and shall be responsible for directing the Trustee to take all required actions
in connection with winding up the Trust.


                                  ARTICLE VIII
                                  MISCELLANEOUS

            Section 8.01. Counterparts. This Trust Agreement may be executed by
the Grantor, the Trustee and the Bank in separate counterparts, each of which
counterparts, when so executed and delivered shall be deemed an original, but
all such counterparts taken together shall constitute one and the same
instrument. Copies of this Trust Agreement shall be filed with the Trustee and
shall be open to inspection during business hours at the Corporate Office by any
Holder of a Trust Preferred Security.


                                      -28-
<PAGE>   34
            Section 8.02. Exclusive Benefits of Parties. This Trust Agreement is
for the exclusive benefit of the parties hereto and the Holders of the Trust
Preferred Securities, and their respective successors and assigns, and shall not
be deemed to give any legal or equitable right, remedy or claim to any other
Person whatsoever.

            Section 8.03. Invalidity of Provisions. In case any one or more of
the provisions contained in this Trust Agreement or of the Trust Preferred
Securities should be or become invalid, illegal or unenforceable in any respect,
the validity, legality and enforceability of the remaining provisions hereof or
thereof shall in no way be affected, prejudiced or disturbed thereby.

            Section 8.04. Notices. Any notices to be given to the Grantor
hereunder shall be in writing and shall be deemed to have been duly given if
personally delivered or sent by mail or by telecopier, addressed to the Grantor
at:

                  UBS AG
                  677 Washington Boulevard
                  Stamford, CT 06901
                  Attention:  Robert Mills
                  Telephone:  203-719-6065
                  Facsimile:  203-719-0340

                  With copies to:

                  UBS AG
                  299 Park Avenue
                  New York, NY 10171
                  Attention:  Robert Dinerstein
                  Telephone:  212-821-3301
                  Facsimile:  212-821-5804

or at any place where the Grantor maintains its principal executive office.

            Any notices to be given to the Trustee hereunder or under the Trust
Preferred Securities shall be in writing and shall be deemed to have been duly
given if personally delivered or sent by mail or by telecopier, addressed to the
Trustee at the Corporate Office.

            Notices to the Holders of the Trust Preferred Securities shall be
given by delivery of the relevant notice to DTC, Euroclear, Clearstream and any
other relevant securities clearing system for communication by each of them to
entitled participants, and, as long as the Trust Preferred Securities are listed
on one or more stock exchanges and the rules of such stock exchange(s) so
require, notices shall also be published in the manner that the rules of such
stock


                                      -29-
<PAGE>   35
exchange(s) may require. In addition, for as long as the rules of the Luxembourg
Stock Exchange so require, notices shall be published in one English language
daily newspaper of general circulation in London (which is expected to be the
Financial Times) and in a daily newspaper of general circulation in Luxembourg
(which is expected to be the Luxembourger Wort).

            If the Trust Preferred Securities are no longer held in the name of
DTC or its nominee, notice to the Holders of the Trust Preferred Securities
shall be mailed by first-class mail, postage prepaid, to the Holders' addresses
appearing in the records of the Trust.

            Delivery of a notice sent by mail shall be deemed to be effected at
the time when the same is deposited, postage prepaid, in a post office letter
box. Delivery of a notice personally delivered or sent by telecopier shall be
deemed to be effected at the time it is received.

            Section 8.05. Holders of the Trust Preferred Securities Are Parties.
Notwithstanding that Holders of the Trust Preferred Securities have not executed
and delivered this Trust Agreement or any counterpart thereof, the Holders of
the Trust Preferred Securities from time to time shall be bound by all of the
terms and conditions hereof and of the Trust Preferred Securities by acceptance
of delivery of Trust Preferred Securities.

            Section 8.06. Governing Law. THIS TRUST AGREEMENT AND THE TRUST
PREFERRED SECURITIES AND ALL RIGHTS HEREUNDER AND THEREUNDER AND PROVISIONS
HEREOF AND THEREOF SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE
LAW OF THE STATE OF DELAWARE.

            Section 8.07. Headings. The headings of articles and sections of
this Trust Agreement and the Trust Preferred Securities have been inserted for
convenience only and are not to be regarded as part of this Trust Agreement or
to have any bearing upon the meaning or interpretation of any provision
contained herein or in the Trust Preferred Securities.

            Section 8.08. Trust Preferred Securities Non-Assessable and Fully
Paid. The Holders of the Trust Preferred Securities shall not be personally
liable for obligations of the Trust, the interests in the Trust represented by
the Trust Preferred Securities shall be non- assessable for any losses or
expenses of the Trust or for any reason whatsoever, and the Trust Preferred
Securities upon delivery thereof by the Trustee pursuant to this Trust Agreement
are and shall be deemed fully paid.

            Section 8.09. No Preemptive Rights. No Holder shall be entitled as a
matter of right to subscribe for or purchase, or have any preemptive right with
respect to, any part of any new or additional interest in the Trust, whether now
or hereafter authorized and whether issued for cash or other consideration or by
way of distribution.


                                      -30-
<PAGE>   36
            Section 8.10. Survival. The rights and protections of the Trustee
hereunder, including, without limitation, its right to defense, indemnity,
expense reimbursement and compensation for its services hereunder, shall survive
the termination of the Trust and this Trust Agreement.


                                      -31-
<PAGE>   37
            IN WITNESS WHEREOF, the Grantor and the Trustee have duly executed
this Trust Agreement as of the day and year first above set forth.


                              UBS PREFERRED FUNDING COMPANY LLC III,
                              as Grantor


                              By: ________________________________
                                  Name:  Robert Mills
                                  Title: President and Managing Director

                              WILMINGTON TRUST COMPANY,
                              as Trustee


                              By: ________________________________
                                  Name:
                                  Title:


            UBS AG joins in this Trust Agreement solely for purposes of
obligating itself under Sections 6.07 and 6.08 of this Trust Agreement and not
as grantor, trustee or beneficiary.


                              UBS AG


                              By: ________________________________
                                  Name:  Robert Mills
                                  Title: Chief Financial Officer- Americas and
                                         Regional Chief Operating Officer

                              By: ________________________________
                                  Name: Robert Dinerstein
                                  Title: Managing Director
<PAGE>   38
                                                                       Exhibit A

THIS GLOBAL CERTIFICATE IS ISSUED IN RESPECT OF AN ISSUE OF THE -%
NONCUMULATIVE TRUST PREFERRED SECURITIES (THE "TRUST PREFERRED SECURITIES") OF
UBS PREFERRED FUNDING TRUST III (THE "TRUST"), ISSUED PURSUANT TO AN AMENDED AND
RESTATED TRUST AGREEMENT DATED AS OF -, 2001 (THE "AGREEMENT") OF THE TRUST
AND IS GOVERNED BY THE TERMS AND CONDITIONS OF THE AGREEMENT GOVERNING THE TRUST
PREFERRED SECURITIES, WHICH TERMS AND CONDITIONS ARE INCORPORATED HEREIN BY
REFERENCE AND, EXCEPT AS OTHERWISE PROVIDED HEREIN, SHALL BE BINDING ON THE
TRUST, UBS PREFERRED FUNDING COMPANY LLC III (THE "GRANTOR") AND THE HOLDER
HEREOF AS IF FULLY SET FORTH HEREIN. UNLESS THE CONTEXT OTHERWISE REQUIRES, THE
TERMS USED HEREIN SHALL HAVE THE MEANINGS SPECIFIED IN THE AGREEMENT.

THIS CERTIFICATE IS A GLOBAL CERTIFICATE WITHIN THE MEANING OF THE AGREEMENT AND
IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE THEREOF. THIS SECURITY
MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A SECURITY REGISTERED, AND NO
TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF
ANY PERSON OTHER THAN SUCH DEPOSITARY OR A NOMINEE THEREOF, EXCEPT IN THE
LIMITED CIRCUMSTANCES DESCRIBED IN THE AGREEMENT.

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO ISSUER OR ITS AGENT
FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED
IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY
AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO
SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY
TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.


                           TRUST PREFERRED SECURITY OF
                        UBS PREFERRED FUNDING TRUST III,
                           a Delaware Business Trust,
               representing $- aggregate liquidation preference of
                 - % Noncumulative Company Preferred Securities,
                   liquidation preference $- per security, of
                      UBS PREFERRED FUNDING COMPANY LLC III
                     (a Delaware Limited Liability Company)


CERTIFICATE NO. -                                               COMMON CODE: -
                                                                ISIN NUMBER: -

            Wilmington Trust Company, not in its individual capacity, but solely
as Trustee (the "Trustee") on behalf of the above-named Trust, hereby certifies
that Cede & Co. is the registered owner of $25 liquidation amount of -%
Noncumulative Trust Preferred Securities, stated liquidation amount $1,000 per
security ("Trust Preferred Securities"), representing undivided beneficial
interests in a corresponding amount of -% Noncumulative Company Preferred
Securities (the "Company Preferred Securities") of UBS Preferred Funding Company
LLC III, a Delaware limited liability company (the "Grantor"), deposited in
trust by the Grantor with the Trustee pursuant to an Amended and Restated Trust
Agreement of UBS Preferred Funding Trust III, dated as of -, 2001 (as amended
or supplemented from time to time, the
<PAGE>   39
"Trust Agreement") between the Grantor and the Trustee. Subject to the terms of
the Trust Agreement, the registered Holder hereof owns an undivided beneficial
interests in the number of Company Preferred Securities held by the Trustee
under the Trust Agreement corresponding to the number of Trust Preferred
Securities evidenced by this global certificate, including the distribution,
voting, liquidation and other rights of such Company Preferred Securities
specified in the Amended and Restated Limited Liability Company Agreement of the
Grantor, as amended, a copy of which is on file at the Corporate Office of the
Trustee.

            (i) The Trust Agreement. The Trust Preferred Securities are issued
upon the terms and conditions set forth in the Trust Agreement. The Trust
Agreement (a copy of which is on file at the Corporate Office of the Trustee)
sets forth the rights of Holders of the Trust Preferred Securities and the
rights and duties of the Trustee and the Grantor. The statements made herein are
summaries of certain provisions of the Trust Agreement and are subject to the
detailed provisions thereof, to which reference is hereby made. In the event of
any conflict or discrepancy between the provisions hereof and the provisions of
the Trust Agreement, the provisions of the Trust Agreement shall govern. Unless
otherwise expressly herein provided, all defined terms used herein shall have
the meanings ascribed thereto in the Trust Agreement.

            (ii) Enforcement of Rights; Withdrawal of Company Preferred
Securities. To the fullest extent permitted by law, without the need for any
other action of any Person, including the Trustee or any other Holder, each
Holder shall be entitled to enforce, in the name of the Trust, the rights of the
Trust in respect of the number of Company Preferred Securities and the
Subordinated Guarantee corresponding to the Trust Preferred Certificates held by
such Holder. Any recovery on such enforcement action shall belong solely to such
Holder who brought the action, not to the Trust, the Trustee or any other Holder
individually or to Holders as a group.

            Any beneficial owner of Trust Preferred Securities may withdraw all,
but not less than all, of the number of Company Preferred Securities
corresponding to such Trust Preferred Securities by providing a written notice
to the Trustee, with evidence of beneficial ownership in form satisfactory to
the Trustee, and providing to the Grantor such documents or information as the
Grantor may request for tax reporting purposes at the Corporate Office. Such
notice shall also be deemed to be such beneficial owner's agreement to be
subject to the terms of the LLC Agreement.

            (iii) Distributions of Dividends on Company Preferred Securities.
Whenever (and to the extent) the Trust receives any cash payment representing a
Dividend or redemption payment on the Company Preferred Securities, the Trustee
acting directly or through any Paying Agent shall distribute such amounts to
Holders of Trust Preferred Securities on the record date therefor, in proportion
to the respective liquidation amounts of the Trust Preferred Securities held by
such Holders.


                                      -2-
<PAGE>   40
            (iv) Redemptions of Company Preferred Securities. The Trust
Preferred Securities shall be redeemed only upon redemption of the Company
Preferred Securities.

            If the Grantor redeems the Company Preferred Securities in
accordance with the LLC Agreement, then the Grantor shall give the Trustee at
least 30 days' prior notice before doing so. The Trustee shall mail the notice
of the redemption not less than 25 days prior to the date fixed for redemption
of the Company Preferred Securities to the Holders of the Trust Preferred
Securities. No defect in the notice of redemption or in the mailing or delivery
thereof or publication of its contents shall affect the validity of the
redemption proceedings.

            If only some of the outstanding Trust Preferred Securities are to be
redeemed, the Trust Preferred Securities to be redeemed shall be selected in
accordance with DTC's procedures. If the Trust Preferred Securities do not
remain registered in the name of DTC or its nominee and only some of the
outstanding Trust Preferred Securities are to be redeemed, the Trust Preferred
Securities shall be redeemed proportionally or selected for redemption pursuant
to the rules of any securities exchange on which the Trust Preferred Securities
are listed at that time. The Grantor shall promptly notify in writing the
Registrar and Transfer Agent for the Trust Preferred Securities of the Trust
Preferred Securities selected for redemption.

            On the date of redemption of the Company Preferred Securities, so
long as the Company or the Bank has deposited with the Paying Agent on behalf of
the Trust the aggregate amount payable upon redemption of all the Company
Preferred Securities held by the Trust to be redeemed, the Paying Agent on
behalf of the Trust shall irrevocably deposit with DTC funds sufficient to pay
the redemption price and give DTC irrevocable instructions to pay the redemption
price to the Holders of the Trust Preferred Securities to be redeemed.

            (v) Distributions in Liquidation of Grantor. Upon receipt by the
Trust of any Liquidation Preference from the Grantor upon the liquidation of the
Grantor, after satisfaction of creditors of the Trust required by applicable
law, the Trust shall distribute the same to Holders of the Trust Preferred
Securities on the record date therefor, in proportion to the respective
Liquidation Preference of the number of Company Preferred Securities
corresponding to the Trust Preferred Securities held by such Holders.

            (vi) Fixing of Record Date for Holders of the Trust Preferred
Securities. Each Regular Distribution on the Trust Preferred Securities shall be
payable to the Holders of record as they appear on the Register on the
corresponding record date. The record date for Regular Distributions is the
fifteenth calendar day prior to the relevant distribution date. Whenever any
other distribution shall become payable, or whenever the Trustee shall receive
notice of any meeting at which holders of the Company Preferred Securities are
entitled to vote or of which holders of the Company Preferred Securities are
entitled to notice, the Trustee shall in each such instance fix a record date
(which shall be the same date as the record date fixed by the Grantor with
respect to the Company Preferred Securities, of which the Grantor shall promptly
inform the Trustee) for the determination of the Holders of the Trust Preferred
Securities who shall be


                                     -3-
<PAGE>   41
entitled (i) to receive such distribution or (ii) to receive notice of, and to
give instructions for the exercise of voting rights at, any such meeting.

            (vii) Payment of Distributions. As long as the Trust Preferred
Securities are in book-entry form, payments on the Trust Preferred Securities
shall be made to DTC, which shall credit the relevant accounts at DTC on the
scheduled payment dates. The payments shall be distributed to participants,
indirect participants and beneficial owners of the Trust Preferred Securities in
accordance with DTC's procedures.

            If definitive Trust Preferred Securities are issued, payments on the
Trust Preferred Securities shall be made by check mailed to the address of the
Holder entitled to receive the payment, as address appears in the Register.
Payments of the redemption price of, and distributions in liquidation on, Trust
Preferred Securities shall be made upon surrender of such Trust Preferred
Securities at the office of the Paying Agent.

            (viii)Voting Rights. If at any time, the holders of Company
Preferred Securities are entitled to vote under the LLC Agreement, the Trustee
shall: (i) notify the Holders of the Trust Preferred Securities of such right,
(ii) request specific direction from each Holder as to the vote with respect to
the Company Preferred Securities represented by such Holder's Trust Preferred
Securities, and (iii) vote the relevant Company Preferred Securities only in
accordance with such specific direction.

            Upon receiving notice of any meeting at which the holders of Company
Preferred Securities are entitled to vote, the Trustee shall, as soon as
practicable, mail to the Holders of the Trust Preferred Securities a notice. The
Company shall provide the form of notice to the Trustee to be forwarded to the
Holders of the Trust Preferred Securities. The notice shall contain: (i) all the
information that is contained in the notice announcing the meeting of the
Company Preferred Securities, (ii) a statement that the Holders of the Trust
Preferred Securities shall be entitled, subject to any applicable provision of
law, to direct the Trustee specifically as to the exercise of the voting rights
pertaining to the number of the Company Preferred Securities represented by
their respective Trust Preferred Securities, and (iii) a brief description of
the manner in which the Holders of the Trust Preferred Securities may give such
specific directions.

            If the Trust receives a written direction from a Holder, the Trustee
shall vote, or cause to be voted, the amount of the Company Preferred Securities
represented by such Holder's Trust Preferred Securities in accordance with the
instructions set forth in the directions. If the Trustee does not receive
specific instructions from any Holder, the Trustee shall abstain from voting the
Company Preferred Securities represented by such Holder's Trust Preferred
Securities.

            (ix) Currency. All distribution and other payments and all other
monetary rights and obligations in respect of the Trust Preferred Certificates
shall be performed in U.S. dollars.


                                     -4-
<PAGE>   42
            (x) Transfer and Exchange of Trust Preferred Securities. Subject to
the terms and conditions of the Trust Agreement, the Registrar shall register
the transfers on the Register from time to time of Trust Preferred Securities
upon any surrender thereof by the Holder in person or by a duly authorized
attorney, properly endorsed or accompanied by a properly executed instrument of
transfer or endorsement, together with evidence of the payment of any transfer
taxes as may be required by law. Upon such surrender, the Trustee shall execute
a new Trust Preferred Security representing the same corresponding amount of the
Company Preferred Securities and deliver the same to or upon the order of the
Person entitled thereto.

            Upon surrender of a Trust Preferred Security at the office of the
Registrar or such other office as the Trustee may designate for the purpose of
effecting an exchange of Trust Preferred Securities, subject to the conditions
to transfer set forth in the Trust Agreement, the Trustee shall execute and
deliver a new Trust Preferred Security representing the same corresponding
amount of Company Preferred Securities as the Trust Preferred Security
surrendered.

            As a condition precedent to the registration of the transfer or
exchange of any Trust Preferred Security, the Registrar, may require (i) the
production of proof satisfactory to it as to the identity and genuineness of any
signature; (ii) compliance with such regulations, if any, as the Trustee or the
Registrar may establish not inconsistent with the provisions of the Trust
Agreement; and (iii) such other information as the Registrar may reasonably
request.

            No Holder may require the transfer of any Trust Preferred Security
to be registered during the period of fifteen days ending on the due date for
any payment of the Liquidation Preference on the Trust Preferred Securities. The
trust shall not be required to register, or cause others to register, the
transfer of Trust Preferred Securities after such Trust Preferred Securities
have been called for redemption.

            (xi) Title to Trust Preferred Securities. It is a condition of the
Trust Preferred Securities, and every successive Holder hereof by accepting or
holding the same consents and agrees, that title to this Trust Preferred
Security, when properly endorsed or accompanied by a properly executed
instrument of transfer or endorsement, is transferable by delivery with the same
effect as in the case of a negotiable instrument; provided, however, that until
the transfer of this Trust Preferred Security shall be registered on the books
of the Trust, the Trustee, the Registrar and the Grantor may, notwithstanding
any notice to the contrary, treat the Holder hereof at such time as the absolute
owner hereof for the purpose of determining the Person entitled to distributions
or to any notice provided for in the Trust Agreement and for all other purposes.

            (xii) Reports, Inspection of Transfer Books. The Trustee shall make
available for inspection by Holders of the Trust Preferred Securities at the
Corporate Office and at such other places as it may from time to time deem
advisable during normal business hours any reports and communications received
by the Trustee as the record holder of the Company


                                      -5-
<PAGE>   43
Preferred Securities. The Registrar shall keep books at the Corporate Office for
the registration of transfer of Trust Preferred Securities, which books at all
reasonable times shall be open for inspection by the Holders of the Trust
Preferred Securities as and to the extent provided by applicable law.

            (xiii)Supplemental Trust Agreement. The Grantor and the Trustee may,
at any time and from time to time, without the consent of the Holders of the
Trust Preferred Securities, enter into one or more agreements supplemental to
the Trust Agreement, in form satisfactory to the Trustee, for any of the
following purposes: (a) to evidence the succession of another partnership,
corporation or other entity to the Grantor and the assumption by any such
successor of the covenants of the Grantor contained therein; (b) to add to the
covenants of the Grantor for the benefit of the Holders of the Trust Preferred
Securities, or to surrender any right or power herein conferred upon the
Grantor; (c)(i) to correct or supplement any provision therein which may be
defective or inconsistent with any other provision therein or (ii) to make any
other provisions with respect to matters or questions arising under the Trust
Agreement, provided that any such action taken under subsection (ii) hereof
shall not materially adversely affect the interests of the Holders of the Trust
Preferred Securities; or (d) to cure any ambiguity or correct any mistake. Any
other amendment or agreement supplemental hereto must be in writing and approved
by Holders of 66 2/3% of the then outstanding Trust Preferred Securities.

            (xiv) Governing Law. The Trust Agreement and this Trust Preferred
Security and all rights thereunder and hereunder and provisions thereof and
hereof shall be governed by, and construed in accordance with, the law of the
State of Delaware.

            (xv) Trust Preferred Security Non-Assessable and Fully Paid. Holders
of the Trust Preferred Securities shall not be personally liable for obligations
of the Trust, the interest in the Trust represented by the Trust Preferred
Securities shall be non-assessable for any losses or expenses of the Trust or
for any reason whatsoever and the Trust Preferred Securities upon delivery
thereof by the Trustee pursuant to the Trust Agreement are and shall be deemed
fully paid.

            (xvi) Liability of Holders of the Trust Preferred Securities.
Holders of the Trust Preferred Securities shall be entitled to the same
limitation of personal liability extended to stockholders of private
corporations for profit organized under the General Corporation Law of the State
of Delaware.

            (xvii)No Preemptive Rights. No Holder shall be entitled as a matter
of right to subscribe for or purchase, or have any preemptive right with respect
to, any part of any new or additional interest in the Trust, whether now or
hereafter authorized and whether issued for cash or other consideration or by
way of distribution.

            This Trust Preferred Security shall not be entitled to any benefits
under the Trust Agreement or be valid or obligatory for any purpose unless this
Trust Preferred Security shall


                                      -6-
<PAGE>   44
have been executed by the Trustee by the manual signature of a duly authorized
signatory of the Trustee, provided, however, that such signature may be a
facsimile if a Registrar (other than the Trustee) shall have countersigned this
Security by manual signature of a duly authorized signatory of the Registrar.

            THE TRUSTEE IS NOT RESPONSIBLE FOR THE VALIDITY OF ANY COMPANY
PREFERRED SECURITIES. THE TRUSTEE ASSUMES NO RESPONSIBILITY FOR THE CORRECTNESS
OF THE FOREGOING DESCRIPTION WHICH CAN BE TAKEN AS A STATEMENT OF THE GRANTOR
SUMMARIZING CERTAIN PROVISIONS OF THE TRUST AGREEMENT. THE TRUSTEE MAKES NO
WARRANTIES OR REPRESENTATIONS AS TO THE VALIDITY, GENUINENESS OR SUFFICIENCY OF
THE COMPANY PREFERRED SECURITIES OR OF THE TRUST PREFERRED SECURITIES; OR AS TO
THE VALIDITY OR SUFFICIENCY OF THE TRUST AGREEMENT; AS TO THE VALUE OF THE TRUST
PREFERRED SECURITIES OR AS TO ANY RIGHT, TITLE OR INTEREST OF THE HOLDERS OF THE
TRUST PREFERRED SECURITIES IN AND TO THE TRUST PREFERRED SECURITIES.


                                       -7-
<PAGE>   45
Dated:  -, 2001



                              UBS PREFERRED FUNDING TRUST III


                              By: Wilmington Trust Company,
                                  not in its individual capacity,
                                  but solely as Trustee on behalf of the Trust,


                                    By: ______________________________
                                        Name:
                                        Title: