Document:

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                                                                     EXHIBIT 4.9

                    UNITED RENTALS, INC. ACQUISITION TRUST
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                             UNITED RENTALS, INC.
                               ACQUISITION TRUST

                                Table of Contents
                                -----------------

<TABLE>
<CAPTION>
                                                                                                   Page
<S>                                                                                                <C>
                                    ARTICLE I
                             Establishment of Trust

1.1      Restatement of Trust....................................................................     1
1.2      Effective Date..........................................................................     1
1.3      Definitions.............................................................................     2

                                   ARTICLE II
                                Payments to Trust

2.1      Receipt of Payments.....................................................................     2
2.2      Form of Payment.........................................................................     2

                                   ARTICLE III
                          Powers and Duties of Trustees

3.1      General.................................................................................     2
3.2      Self-Directed Investments...............................................................     3
3.3      Prudence Standard.......................................................................     5
3.4      Agents and Employees....................................................................     6
3.5      Taxes, Expenses and Fees................................................................     7
3.6      Valuation of Trust......................................................................     7
3.7      Tenure in Office........................................................................     8
3.8      Successor Trustee.......................................................................     8
3.9      Bonding.................................................................................     8
3.10     Duties Not Assigned.....................................................................     8

                                   ARTICLE IV
                                Investment Powers

4.1      Investment Powers.......................................................................     9
4.2      Responsibilities and Indemnification....................................................    12
</TABLE>
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                                     -ii-

<TABLE>
<S>                                                                                                  <C>
4.3      Insurance...............................................................................    12

                                    ARTICLE V
                              Accounts and Records

5.1      Receipts and Disbursements..............................................................    14
5.2      Reports.................................................................................    14

                                   ARTICLE VI
                             Payments from the Trust

6.1      Payments Generally......................................................................    15
6.2      No Assignment...........................................................................    15
6.3      Rollover Contributions and Payments.....................................................    15

                                   ARTICLE VII
                                   Amendments

7.1      Right to Amend..........................................................................    16
7.2      Limitations.............................................................................    16
7.3      Right to Terminate......................................................................    16
7.4      Distribution on Termination.............................................................    16

                                  ARTICLE VIII
                            Miscellaneous Provisions

8.1      Exclusive Benefit.......................................................................    17
8.2      Returned Contributions..................................................................    17
8.3      General Undertaking.....................................................................    18
8.4      Invalidity of Certain Provisions........................................................    18
8.5      Trustees as Representative..............................................................    18
8.6      Insurer.................................................................................    18
8.7      Mailing Notices.........................................................................    19
8.8      Governing Law...........................................................................    19
8.9      Approval of IRS.........................................................................    19
8.10     Company Determinations..................................................................    19
8.11     Counterpart Originals...................................................................    19
</TABLE>
<PAGE>

                             UNITED RENTALS, INC.
                               ACQUISITION TRUST

     THIS TRUST AGREEMENT, made this ___ day of ________________________, 1999,
by and between United Rentals, Inc., a Delaware corporation (hereinafter
referred to as the "Company") and, Grace M. Crickette, Michael J. Nolan and
Wayland R. Hicks (hereinafter referred to as the "Trustees")

                             W I T N E S S E T H:

     WHEREAS, the Company has established and adopted the United Rentals, Inc.
Acquisition Plan and, in order to aid in the proper execution of such Plan, has
authorized the simultaneous establishment and adoption of the United Rentals,
Inc. Acquisition Trust.

     NOW, THEREFORE, in consideration of the promises and the mutual covenants
herein contained, it is agreed by and between the Company and the Trustees as
follows:

                                   ARTICLE I
                             Establishment of Trust
                             ----------------------

     1.1  Establishment of Trust.  The Trustees hereby establish and adopt this
          ----------------------
Trust simultaneously with the establishment and adoption of the United Rentals,
Inc. Acquisition Plan, both of which are for the benefit of eligible Employees.

     1.2  Effective Date.  This Trust shall be effective as of April 1, 1999.
          --------------
<PAGE>

                                      -2-

     1.3  Definitions.  All terms defined in the United Rentals, Inc.
          -----------
Acquisition Plan shall have the same meaning whenever used in this Trust unless
the context clearly indicates otherwise.

                                   ARTICLE II
                               Payments to Trust
                               -----------------

     2.1  Receipt of Payments.  The Company or the Administrator may from time
          -------------------
to time remit contributions under the Plan to the Trustees. Such contributions
and funds, together with any income thereon, shall be held in trust on behalf of
Participants and their Beneficiaries. The Trustees shall be accountable therefor
to the Company and the Administrator, but shall not have any right or duty to
compute or enforce collection of any contribution from the Company, the
Administrator or any Participant. The Trustees shall be responsible only for
such funds and assets as shall actually be received by them as Trustees
hereunder.

     2.2  Form of Payment.  All payments to the Trust shall be remitted in U.S.
          ---------------
currency or other property to the Trustees at the address specified by them. Any
payments not in U.S. currency may, in the sole discretion of the Trustees, be
refused.

                                  ARTICLE III
                         Powers and Duties of Trustees
                         -----------------------------

     3.1  General.  The Trustees shall hold the funds and assets received under
          -------
the Plan subject to the terms and provisions of this Trust. Subject to section
3.2, the Trustees shall manage, invest and reinvest all funds under the Trust,
shall collect the income thereon and make payments therefrom, as provided in the
Trust.
<PAGE>

                                      -3-

     3.2  Self-Directed Investments.
          -------------------------

          (a) The Trustees may, in their discretion, permit Participants, the
Beneficiaries of a deceased Participant and any Alternate Payees to self-direct
the investment of assets credited to the Account of the Participant, Beneficiary
or Alternate Payee.  The Trustees shall determine the investment choices to be
made available, which may include designated investment funds, specific
investments or both.  The investment choices made available shall be sufficient
to allow compliance with section 404(c) of ERISA.

          (b) (1)  If the Trustees permit self-directed investments as described
in subsection (a), the Administrator shall establish rules and procedures that
it feels are advisable to implement such an investment program. Such rules and
procedures shall be consistent with section 404(c) of ERISA.

              (2)  In establishing rules and procedures under subsection (b)(1),
the following shall apply:

                   (A) Each Participant, Beneficiary or Alternate Payee shall
affirmatively elect to self-direct the investment of assets in his or her
Account, but such election may provide for default investments in the absence of
specific directions from such Participant, Beneficiary or Alternate Payee.

                   (B) The investment directions of a Participant shall continue
to apply after that Participant's death or incompetence until the Beneficiary
(or, if there is more than one Beneficiary for that Account, all of the
Beneficiaries), guardian or other representatives provide contrary direction.
<PAGE>

                                      -4-

                    (C)  The Trustees may decline to implement investment
designations if such investment in the Trustees' judgment:

                         (i)   would result in a prohibited transaction under
section 4975 of the Code;

                         (ii)  would generate income taxable to the Trust;

                         (iii) would not be in accordance with the Plan and
Trust;

                         (iv)  would cause a fiduciary to maintain the indicia
of ownership of any assets of the Trust outside the jurisdiction of the district
courts of the United States other than as permitted by section 404(b) of ERISA
and Labor Reg. (S)2550.404b-1;

                         (v)   would jeopardize the Plan's tax qualified status
under the Code;

                         (vi)  could result in a loss in excess of the amount
credited to the Account; or

                         (vii) would violate any other requirements of the Code
or ERISA.

                    (D)  The Administrator may establish reasonable restrictions
on the frequency with which investment directions may be given, consistent with
section 404(c) of ERISA.
<PAGE>

                                      -5-

                    (E)  The Administrator may establish limits on the use of
brokers, investment counsel or other advisors that may be utilized, including
specifying that all investments must be made through a designated broker or
brokers.

                    (F)  The Administrator may establish limits on the types of
investments that are permitted.

          (c)  Any and all costs associated with investment directions made by a
Participant, Beneficiary or Alternate Payee for an Account shall be charged
directly to such Account.

     3.3  Prudence Standard.  The Trustees, the Administrator and all other
          -----------------
Fiduciaries under the Plan and Trust shall discharge their duties with respect
to the Trust and the Plan solely in the interest of the Participants and their
Beneficiaries:

          (a)  for the exclusive purpose of providing benefits to Participants
and their Beneficiaries; and defraying reasonable expenses of administering the
Plan and this Trust;

          (b)  with the care, skill, prudence and diligence under the
circumstances then prevailing that a prudent man acting in a like capacity and
familiar with such matters would use in the conduct of an enterprise of a like
character and with like aims;

          (c)  by diversifying the investments of the Trust to minimize the risk
of large losses, unless under the circumstances it is clearly not prudent to do
so; and
<PAGE>

                                      -6-

          (d)  in accordance with the terms of the Trust insofar as they are
consistent with Title I of the Employee Retirement Income Security Act of 1974.

     3.4  Agents and Employees.
          --------------------

          (a)  The Trustees, with the consent of the Administrator, may retain
or employ one or more persons, including investment managers, to render advice
or perform services under the Trust and the Plan. The Trustees shall
periodically review the performance of such agents and employees.

          (b)  The term "investment manager" means any Fiduciary other than the
Trustees or any Fiduciary named in the Plan and Trust who:

               (1)  has the power to manage, acquire or dispose of any assets of
the Trust; and

               (2)  is registered as an investment adviser under the Investment
Advisers Act of 1940; is a bank as defined in that Act; or is an insurance
company qualified to perform the services described in paragraph (1) above under
the laws of more than one state; and

               (3)  has acknowledged in writing that it is a Fiduciary with
respect to the Plan.

          (c)  Each investment manager shall possess all the investment powers
granted to the Trustees with respect to those assets over which it has
investment responsibility.
<PAGE>

                                      -7-

     3.5  Taxes, Expenses and Fees.
          ------------------------

          (a)  The Trustees shall deduct from and charge against the assets of
the Trust any taxes, including income, withholding and transfer taxes, that are
imposed upon the assets of the Trust or the income thereof, or that are imposed
with respect to the interest of any person under the Plan.

          (b)  The Trustees shall deduct from and charge against the assets of
the Trust all expenses not paid by the Company (in accordance with the Plan)
that are properly incurred in the administration and operation of this Trust.

          (c)  All expenses charged against the Trust shall be allocated among
the Accounts of Participants and Beneficiaries as follows:

               (1)  all expenses that are directly related to specific Accounts
shall be charged to such Accounts;

               (2)  all other expenses shall be allocated in such other manner
as the Administrator deems equitable.

          (d)  An individual Trustee shall not receive any compensation for
services hereunder, other than  reimbursement of expenses incurred.  Any other
Trustee shall receive such reasonable compensation for services as may be
mutually agreed to by such Trustee, the Company and the other Trustees.

     3.6  Valuation of Trust.  The Trustees, as of the Valuation Date, and at
          ------------------
such other time or times as they determine, shall determine the net worth of the
assets of the Trust.  In determining such net worth, the assets of the Trust
shall be evaluated at their fair
<PAGE>

                                      -8-

market value and all expenses shall be deducted. The Trustees may adopt such
methods of valuation as they deem advisable.

     3.7  Tenure in Office.  Any Trustee may resign upon giving thirty (30)
          ----------------
days' written notice to the Company.  Upon thirty (30) days' written notice,
unless a shorter period is agreed to, the Company shall have the power to remove
any Trustee for any reason and to appoint a successor.  The Company shall have
the power at any time to appoint additional co-Trustees upon written notice to
the existing Trustees.  On removal or resignation of a Trustee, the
Administrator may require an accounting of Trust assets.

     3.8  Successor Trustee.  The appointment of an additional or successor
          -----------------
Trustee shall become effective upon acceptance in writing of such appointment by
the additional or successor Trustee.  The additional or successor Trustee may be
either a corporate trustee or an individual trustee  and such Trustee shall not
have any liability for any previous actions or omissions by the predecessor
Trustee.  Every additional or successor Trustee appointed to and accepting a
trusteeship hereunder shall have all the rights, title, powers, duties,
exemptions and limitations of the original Trustee.

     3.9  Bonding.  Except to the extent otherwise required by law, the Trustees
          -------
shall not be required to obtain any bonds in connection with their duties
hereunder.  The cost of any bond obtained may be charged as an expense of the
Trust, but if not so charged, shall be paid by the Company.

     3.10 Duties Not Assigned.  The duties of the Trustees with respect to the
          -------------------
Plan are limited to those assumed by the Trustees by the terms of this Trust.
The Trustees shall not be deemed, by virtue hereof, to be the administrator or
sponsor of the Plan, and shall not be responsible for filing reports, returns or
disclosures with any government agency except as may otherwise be required by
their duties as Trustees under applicable law.
<PAGE>

                                      -9-

                                  ARTICLE IV
                               Investment Powers
                               -----------------

     4.1  Investment Powers.
          -----------------

          (a)  The Trustees shall have the following powers and authority in the
administration of the Trust:

               (1)  to purchase, receive or subscribe for any securities or
other property (whether tangible, intangible or real) and to retain in trust
such securities or other property,

               (2)  to sell for cash or on credit, to grant options, convert,
redeem, exchange for other securities or other property, or otherwise to dispose
of any securities or other property at any time;

               (3)  to settle, compromise or submit to arbitration any claims,
debts, or damages, due or owing to or for the Trust, to commence or defend suits
or legal proceedings in any court of law or before any other body or tribunal;

               (4)  to exercise any conversion privilege or subscription right
available in connection with any securities or other property at any time; to
oppose or consent to the reorganization, consolidation, merger or readjustment
of the finances of any corporation, company or association, or to the sale,
mortgage, pledge or lease of the property of any corporation, company or
association any of the securities of which may at any time be held hereunder and
to do any act with reference thereto, including the exercise of options, the
making of agreements or subscriptions and the payment of expenses,
<PAGE>

                                      -10-

assessments or subscriptions, which may be deemed necessary or advisable in
connection therewith, and to hold and retain any securities or other property
which they may so acquire;

               (5)  to exercise personally or by general or limited power of
attorney any right, including the right to vote (whether by proxy or otherwise),
appurtenant to any securities or other property held hereunder at any time;

               (6)  to borrow money from any lender in such amounts and upon
such terms and conditions as shall be deemed advisable or proper to carry out
the purposes of the Trust and to pledge any securities or other property for the
repayment of any such loan;

               (7)  to manage, administer, operate, lease for any number of
years, develop, improve, repair, alter, demolish, mortgage, pledge, grant
options with respect to or otherwise deal with any real property or interest
therein at any time held by them, and to hold any such real property in their
own name or in the name of a nominee, with or without the addition of words
indicating that such property is held in a fiduciary capacity, all upon such
terms and conditions as may be deemed advisable;

               (8)  to renew, extend or participate in the renewal or extension
of any mortgage, upon such terms as may be deemed advisable, and to agree to a
reduction in the rate of interest on any mortgage or any guarantee pertaining
thereto in any manner and to any extent that may be deemed advisable for the
protection of the Trust assets or the preservation of the value of the
investment; to waive any default, whether in the performance of any covenant or
condition of any mortgage or in the performance of any guarantee, or to enforce
any such default in such manner and to such extent as may be deemed advisable;
to exercise and enforce any and all rights of foreclosure, to bid in property on
foreclosure, to take a deed in lieu of foreclosure with or without paying a
<PAGE>

                                      -11-

consideration therefor and in connection therewith to release the obligation on
the bond secured by such mortgage, and to exercise and enforce in any action,
suit or proceedings at law or in equity any rights or remedies in respect to any
such mortgage or guarantee;

               (9)  to hold part or all of the assets of the Trust uninvested;

               (10) to employ suitable agents and counsel and to pay reasonable
expenses and compensation;

               (11) to form corporations and to create trusts to hold title to
any securities or other property, all upon such terms and conditions as may be
deemed advisable;

               (12) to invest (and reinvest) in any proportion, through the
medium of any combined, common or commingled trust fund or funds established by
the Trustees for the investment of trust funds held by the Trustees, whether or
not such funds are limited to qualified retirement plans. Any assets of this
Trust invested in any such combined funds shall be subject to all provisions
thereof, as the same may be amended from time to time;

               (13) to make, execute and deliver, as Trustees, any and all
deeds, leases, mortgages, conveyances, waivers, releases or other instruments in
writing necessary or desirable for the accomplishment of any of the foregoing
powers;

               (14) generally to do all acts, whether or not expressly
authorized, that the Trustees deem necessary or desirable for the protection of
the Trust.
<PAGE>

                                      -12-

          (b)  In addition to every power and discretion conferred upon the
Trustees by any other provisions of this Trust, the Trustees will have all the
usual powers conferred by law on trustees; and in addition thereto, the Trustees
are empowered with respect to the Trust to make investments and reinvestments
without distinction between principal and income in any form of tangible or
intangible property, real or personal, or in the securities of any form of
enterprise wherever it may be located, organized or operated within or without
the United States, including investments that yield a high rate of income or do
not yield any income at all.  The Trustees may invest in securities or new
ventures which involve a greater degree of risk than investments that have
demonstrated their investment performance over an extended period of time.  In
making and holding investments, the Trustees will not be restricted to those
investments that are authorized by the law or rule of the courts of the State of
Connecticut for the investment of trust funds; provided, however, that
investments shall not be made in any securities or other obligations of the
Company or of any other entity that is an affiliate of the Company.

     4.2  Responsibilities and Indemnification.
          ------------------------------------

          (a)  The Trustees do not have any duty or obligation, express or
implied, with respect to any transaction involving the investment of assets
controlled by the Administrator or by an investment manager.

          (b)  The Company hereby agrees to indemnify each and every individual
Trustee and employee acting on behalf of such Trustee for any expenses or
liabilities (other than those due to willful misconduct) actually incurred in
the performance of their duties under the Plan and Trust.

     4.3  Insurance.
          ---------
<PAGE>

                                      -13-

          (a)  The Trustees may also purchase a contract or contracts of an
insurance company on the lives of Participants.

          (b)  If any such contracts of insurance are purchased, the investment
therein shall be for the benefit of the respective Accounts of the individual
Participants on  whose lives the contracts are purchased.  The premium costs of
any such policy shall be charged against the respective Account of the
Participant on whose life the contract is purchased, the cash surrender value
shall be a credit to such Account, and the proceeds on maturity of the policy
(in excess of cash surrender value already credited) shall be credited to such
Participant's Account so that the same may be part of any benefit provided for
on the death of a Participant.  The Trustees shall not, however, purchase a
contract of insurance on the life of any Participant unless every other
Participant is given the right to request that a similar contract be issued on
that Participant's life out of the funds available to the credit of that
Participant's Account.

          (c)  The application for any contract of an insurance company
purchased herein shall be signed by the Trustees, and the Trustees, in their
capacity as such shall be designated as, and shall be, the sole owner of all
such contracts, shall be designated as the death beneficiary thereof, and shall
have the sole privilege to exercise all rights, options and benefits provided by
the contracts or permitted by the rules of the insurer. Neither the Trustees nor
the insurance company shall require the signature of the Company, any
Participant, or any other person or persons for the exercise of any such rights
or options by the Trustees, or for the receipt of any death benefits.

          (d)  In the event life insurance contracts are purchased on the lives
of any Participants, the following limitations shall apply:
<PAGE>

                                      -14-

          (1)  The aggregate premiums paid for such ordinary life insurance
contracts on the life of each Participant shall at all times be less than one-
half (1/2) of the aggregate of the contributions allocated to such Participant
at any particular time (twenty-five percent (25%) in the case of term
insurance); and

          (2)  Such life insurance contracts shall be converted on or before the
insured Participant's attainment of age sixty-five (65) or Termination of
Employment, to one providing a periodic income beginning at such time, or else
the same shall either be surrendered for cash, or distributed in kind to the
Participant, to the end that such contracts cannot be continued in order to
provide continued life insurance protection.

          (3)  If the provisions of paragraph (1) above prevent the payment of
any premium when it becomes due, such steps shall be taken with reference to
such contracts as are permitted by the terms of the particular contract or under
the rules of the insurance company to preserve the equities already created.

                                   ARTICLE V
                              Accounts and Records
                              --------------------

     5.1  Receipts and Disbursements.  The Trustees shall keep full accounts of
          --------------------------
all receipts and disbursements.  The Trustees' records with respect to the
assets under this Trust shall be open to inspection during reasonable business
hours.  The Trustees shall render such statements and valuations of Trust assets
as may be agreed upon between the Administrator and the Trustees.

     5.2  Reports.  The Trustees shall render an annual report to the Company
          -------
within a reasonable period of time after the end of each Plan Year, said report
to contain a complete accounting showing the total assets in the Trust as of the
Valuation Date and the fair market value placed on each asset as of the end of
that date, as well as a statement of
<PAGE>

                                      -15-

purchases, sales and any investment charges and all income, expenses, and
disbursements since the last such report. Such report shall be in such form and
contain such other information concerning the Trust assets and the
administration thereof as shall be mutually agreed upon in writing by the
Company and the Trustees.

                                   ARTICLE VI
                            Payments From the Trust
                            -----------------------

     6.1  Payments Generally.  The Trustees shall make payments out of the
          ------------------
assets of the Trust to such persons, in such manner and in such amounts as the
Administrator directs.

     6.2  No Assignment.  Except to the extent otherwise provided in the Plan,
          -------------
the interest of Participants and Beneficiaries in the Trust and in the net
earnings and profits thereof may not be assigned or used by the Participant or
Beneficiary as collateral for a loan and shall not be subject to garnishment,
attachment, levy or execution of any kind for the debts or defaults of the
Trustees or of any person, natural or legal, having interest in the Trust.

     6.3  Rollover Contributions and Payments.
          -----------------------------------

          (a) Notwithstanding any other provision to the contrary, the Trustees
may transfer, upon the Administrator's instructions, the vested interest, if
any, in a Participant's Account in the Trust to another trust forming part of a
pension, profit sharing or stock bonus plan maintained by such Participant's new
employer and meeting the requirements of Code section 401(a).

          (b) Subject to the Administrator's approval, the Trustees may accept
Rollover Contributions transferred from other trusts or from an individual
retirement
<PAGE>

                                      -16-

account to the Account of a Participant under this Trust, provided that in the
Trustees' opinion, the transfer will not jeopardize the exempt status of the
Plan or Trust.

                                  ARTICLE VII
                                  Amendments
                                  ----------

     7.1  Right to Amend.  The Company reserve the right to amend this Trust at
          --------------
any time, in whole or in part, before or after Plan termination, by an
instrument in writing executed by the Company.

     7.2  Limitations.  No amendment of this Trust shall:
          -----------

          (a) reduce any vested right or interest to which any Participant or
Beneficiary is then entitled under the Plan or otherwise reduce the vested
rights of a Participant in violation of section 411(d)(6) of the Code;

          (b) vest in the Company any interest or control over any assets of the
Trust;

          (c) cause any assets of the Trust to be used for, or diverted to,
purposes other than for the exclusive benefit of Participants and their
Beneficiaries; or

          (d) change any of the rights duties or powers of the Trustees without
their written consent.

     7.3  Right to Terminate.  The Company may terminate this Trust by an
          ------------------
instrument in writing executed by the Company at any time.  Neither a temporary
cessation of contributions nor the suspension of Company Contributions shall be
deemed to be a termination of this Trust.
<PAGE>

                                      -17-

     7.4  Distribution on Termination.  Unless instructions to the contrary are
          ---------------------------
received from the Company, upon a termination of the Trust, the Trustees shall
liquidate the assets of the Trust (to the extent in-kind distributions are not
contemplated) and, after paying the reasonable expenses of the Trust, including
expenses attributable to the termination, distribute the balance of the Trust as
provided by the Plan.

                                 ARTICLE VIII
                            Miscellaneous Provisions
                            ------------------------

     8.1  Exclusive Benefit.  This Trust is created for the exclusive purpose of
          -----------------
providing benefits to the Participants in the Plan and their Beneficiaries and
defraying reasonable expenses of administering the Trust and the Plan, and shall
be interpreted in a manner consistent with its being an employees' trust, as
defined in section 401(a) of the Code, or any successor provisions. Therefore,
under no circumstances, except as set forth in sections 8.2 and 8.9, shall any
funds contributed to this Trust, any assets of this Trust, or income of this
Trust ever revert to or be used or enjoyed by the Company, nor shall any such
funds, assets or income ever be used or diverted to, purposes other than for the
exclusive benefit of the Participants or their Beneficiaries.

     8.2  Returned Contributions.
          ----------------------

          (a)  A contribution made by the Company by a mistake of fact shall, if
the Administrator so directs, be returned to the Company within one (1) year
after its payment.  The Administrator shall, in its sole discretion, determine
whether the contribution was made by mistake of fact based upon such evidence as
it deems appropriate.

          (b)  A contribution made by the Company that is conditioned on
deductibility under section 404 of the Code shall, to the extent such deduction
is disallowed,
<PAGE>

                                      -18-

be returned to the Company within one (1) year after the disallowance, if the
Administrator so directs.

     8.3  General Undertaking.  All parties to this Trust and all persons
          -------------------
claiming any interest whatsoever hereunder agree to perform any and all acts and
execute any and all documents and papers which may be necessary or desirable for
the carrying out of the Trust or any of its provisions.

     8.4  Invalidity of Certain Provisions.  If any provision of this Trust
          --------------------------------
shall be held invalid or unenforceable, such invalidity or unenforceability
shall not affect any other provisions hereof and the Trust shall be construed
and enforced as if such provisions had not been included.

     8.5  Trustees as Representative.  In all judicial proceedings affecting the
          --------------------------
Trust, the Trustees shall be the only necessary party and shall represent the
Company and all persons, natural or legal, having an interest in the Trust.

     8.6  Insurer.  Any insurance company issuing a policy or contract under
          -------
this Plan shall not be considered a party to this Plan or Trust or to have any
responsibility for the validity of this Plan or Trust, or for any action taken
by the Trustees.  The insurance company shall be fully protected in dealing with
the Trustees as sole owner of the policy or contract.  The insurance company
shall be fully protected in accepting payments from the Trustees and making
payment of any amounts to the Trustees or in accordance with their directions,
without liability to see to the application of any such payments.  The insurance
company shall be fully protected from any liability in assuming that the Plan
has not been amended or terminated until notice of any amendment or termination
has been received by it at its home office.  The insurance company shall also be
fully protected in  dealing with the Trustees according to the latest
notification received by the insurer at its home office
<PAGE>

                                      -19-

and it shall accept, and shall be fully protected in accepting, the signature of
the Trustees as to the exercise of any rights under a policy or contract and on
applications and documents relating thereto.

     8.7  Mailing Notices.  Notices, accountings, and reports required to be
          ---------------
given by the Trustees may be given by personal delivery or by mail addressed to
the party involved at the last address of such party recorded on the general
address files of the Trustees.  If given by mail, the date of mailing shall be
deemed to be the date as of which the same was given or furnished to the
addressee.  Any notice required under the Trust may be waived in writing by the
person entitled to notice.

     8.8  Governing Law.  This Plan shall be governed by, construed and
          -------------
administered in accordance with ERISA and any other applicable federal law;
provided, however, that to the extent not preempted by federal law this Plan
shall be governed by, construed and administered under the laws of the State of
Delaware, other than its laws respecting choice of law.

     8.9  Approval of IRS.  If the initial approval of the Internal Revenue
          ---------------
Service cannot be secured that the Plan qualifies under section 401(a) of the
Code and the Trust qualifies under section 501(a) of the Code, then the Plan and
Trust, at the election of the Company, shall be void as of the Effective Date
and all contributions shall be returned to the respective parties.

     8.10 Company Determinations.  Any determinations, actions or decisions of
          ----------------------
the Company (including but not limited to, Trust amendments and Trust
termination) shall be made by its board of directors in accordance with its
established procedures or by such other individuals, groups or organizations
that have been properly delegated by the board of directors to make such
determination or decision.
<PAGE>

                                      -20-

     8.11 Counterpart Originals.  This Trust may be executed in one or more
          ---------------------
counterpart originals.
<PAGE>

                                      -21-

     IN WITNESS WHEREOF, the Company, on behalf of the Employer, has caused this
Trust to be executed by its duly authorized officers and the Trustees have
executed this Trust as of the date first above written.

Attest:                                 UNITED RENTALS, INC.

__________________________________ By: _________________________________________
Secretary                              Wayland R. Hicks, Chief Operating Officer

                                       TRUSTEES

                                       _________________________________________
                                       Grace M. Crickette

                                       _________________________________________
                                       Michael J. Nolan

                                       _________________________________________
                                       Wayland R. Hicks<PAGE>   1
                                                                     EXHIBIT 4.5

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

                           IMPSAT Fiber Networks, Inc.

                                       and

                              The Bank of New York
                                  Rights Agent

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

                                Rights Agreement

                           Dated as of June [ ], 2000

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

<PAGE>   2

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                        Page
                                                                                                                        ----
<S>             <C>                                                                                                     <C>
Section 1.      Certain Definitions.......................................................................................1

Section 2.      Appointment of Rights Agent...............................................................................7

Section 3.      Issue of Rights Certificates..............................................................................7

Section 4.      Form of Rights Certificates..............................................................................10

Section 5.      Countersignature and Registration........................................................................11

Section 6.      Transfer, Splitup, Combination and Exchange of Rights Certificates; Mutilated, Destroyed, Lost or
                Stolen Rights Certificates...............................................................................12

Section 7.      Exercise of Rights; Purchase Price; Expiration Date of Rights............................................13

Section 8.      Cancellation and Destruction of Rights Certificates......................................................15

Section 9.      Reservation and Availability of Capital Stock............................................................15

Section 10.     Preferred Stock Record Date..............................................................................17

Section 11.     Adjustment of Purchase Price, Number and Kind of Shares or Number of Rights..............................18

Section 12.     Certificate of Adjusted Purchase Price or Number of Shares...............................................30

Section 13.     Consolidation, Statutory Share Exchange, Merger or Sale or Transfer of Assets or Earning Power...........30

Section 14.     Fractional Rights and Fractional Shares..................................................................33

Section 15.     Rights of Action.........................................................................................34

Section 16.     Agreement of Rights Holders..............................................................................35

Section 17.     Rights Certificate Holder Not Deemed a Stockholder.......................................................36

Section 18.     Concerning the Rights Agent..............................................................................36
</TABLE>

<PAGE>   3

<TABLE>
<S>             <C>                                                                                                     <C>
Section 19.     Merger or Consolidation or Change of Name of Rights Agent................................................36

Section 20.     Duties of Rights Agent...................................................................................37

Section 21.     Change of Rights Agent...................................................................................40

Section 22.     Issuance of New Rights Certificates......................................................................41

Section 23.     Redemption and Termination...............................................................................42

Section 24.     Notice of Certain Events.................................................................................43

Section 25.     Notices..................................................................................................44

Section 26.     Supplements and Amendments...............................................................................45

Section 27.     Successors...............................................................................................45

Section 28.     Determinations and Actions by the Board of Directors, etc................................................45

Section 29.     Benefits of This Agreement...............................................................................46

Section 30.     Severability.............................................................................................46

Section 31.     Governing Law............................................................................................47

Section 32.     Counterparts.............................................................................................47

Section 33.     Descriptive Headings.....................................................................................47

Exhibit A -- Form of Rights Certificate

Exhibit B -- Form of Summary of Rights
</TABLE>

                                      -ii-
<PAGE>   4

                                RIGHTS AGREEMENT

       RIGHTS AGREEMENT, dated as of June [ ], 2000 (the "Agreement"), between
IMPSAT Fiber Networks, Inc., a Delaware corporation (the "Company"), and The
Bank of New York (the "Rights Agent").

                               W I T N E S S E T H

       WHEREAS, on January 12, 2000 (the "Rights Dividend Declaration Date"),
the Board of Directors of the Company authorized and declared a dividend
distribution ("Distribution") of one Right for each share of Common Stock (as
hereinafter defined) of the Company outstanding at the close of business on
February 15, 2000 (the "Record Date"), and has authorized the issuance of one
Right (as such number may hereinafter be adjusted pursuant to the provisions of
Section 11(o) hereof) for each share of Common Stock of the Company issued
between the Record Date (whether originally issued or delivered from the
Company's treasury) and the Distribution Date (as hereinafter defined), each
Right initially representing the right to purchase one one-hundredth of a share
of Preferred Stock (as hereinafter defined) upon the terms and subject to the
conditions hereinafter set forth (the "Rights");

       NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein set forth, the parties hereby agree as follows:

       Section 1. Certain Definitions. For purposes of this Agreement, the
following terms have the meanings indicated:

              (a) "Acquiring Person" shall mean any Person who or which,
       together with all Affiliates and Associates of such Person, shall be the
       Beneficial Owner of 20% or more of the shares of Common Stock then
       outstanding, but shall not include the Exempt Investors, the Company, any
       Subsidiary of the Company, any benefit plan of the Company or of any
       Subsidiary of the Company, or any Person organized, appointed or
       established by the Company for or pursuant to the terms of any such plan.

              (b) "Act" shall mean the Securities Act of 1933, as amended.

              (c) "Adverse Person" shall mean any Person declared to be an
       Adverse Person by the Board of Directors upon determination that the
       criteria set forth in Section 11(a)(ii)(B) apply to such Person.

<PAGE>   5

              (d) "Affiliate" and "Associate" shall have the respective meanings
       ascribed to such terms in Rule 12b-2 of the General Rules and Regulations
       under the Securities Exchange Act of 1934, as amended (the "Exchange
       Act") and in effect on the date of this Agreement.

              (e) A Person shall be deemed the "Beneficial Owner" of, and shall
       be deemed to "beneficially own," any securities:

                     (i) which such Person or any of such Person's Affiliates or
              Associates, directly or indirectly, has the right to acquire
              (whether such right is exercisable immediately or only after the
              passage of time) pursuant to any agreement, arrangement or
              understanding (whether or not in writing) or upon the exercise of
              conversion rights, exchange rights, rights, warrants or options,
              or otherwise; provided, however, that a Person shall not be deemed
              the "Beneficial Owner" of, or to "beneficially own," (A)
              securities tendered pursuant to a tender or exchange offer made by
              such Person or any of such Person's Affiliates or Associates until
              such tendered securities are accepted for purchase or exchange, or
              (B) securities issuable upon exercise of Rights at any time prior
              to the occurrence of a Triggering Event, or (C) securities
              issuable upon exercise of Rights from and after the occurrence of
              a Triggering Event which Rights were acquired by such Person or
              any of such Person's Affiliates or Associates prior to the
              Distribution Date or pursuant to Section 3(a) or Section 22 hereof
              (the "Original Rights") or pursuant to Section 11(i) hereof in
              connection with an adjustment made with respect to any Original
              Rights;

                     (ii) which such Person or any of such Person's Affiliates
              or Associates, directly or indirectly, has the right to vote or
              dispose of or has "beneficial ownership" of (as determined
              pursuant to Rule 13d-3 of the General Rules and Regulations under
              the Exchange Act as in effect on the date of this Agreement),
              including pursuant to any agreement, arrangement or understanding,
              whether or not in writing; provided, however, that a Person shall
              not be deemed the "Beneficial Owner" of, or to "beneficially own,"
              any security under this subparagraph (ii) as a result of an
              agreement, arrangement or understanding to vote such security if
              such agreement, arrangement or understanding: (A) arises solely
              from a revocable proxy given in response to a public proxy or
              consent solicitation made pursuant to, and in accordance with, the
              applicable provisions of the General Rules and Regulations under
              the Exchange Act, and (B) is not also then reportable by such
              Person on

                                      -2-
<PAGE>   6

              Schedule 13D under the Exchange Act (or any comparable or
              successor report); or

                     (iii) which are beneficially owned, directly or indirectly,
              by any other Person (or any Affiliate or Associate thereof) with
              which such Person (or any of such Person's Affiliates or
              Associates) has any agreement, arrangement or understanding
              (whether or not in writing), for the purpose of acquiring,
              holding, voting (except pursuant to a revocable proxy as described
              in the proviso to subparagraph (ii) of this paragraph (e)) or
              disposing of any voting securities of the Company;

       provided, however, that nothing in this paragraph (e) shall cause a
       Person engaged in business as a broker dealer registered under Section 15
       of the Exchange Act or an underwriter of securities to be the "Beneficial
       Owner" of, or to "beneficially own," any securities acquired: (A) in the
       ordinary course of its business and incident to the establishment or
       maintenance by it of a primary or secondary market for such security, or
       (B) through such Person's participation in good faith in a firm
       commitment underwriting, in each case until the expiration of forty days
       after the date of such acquisition; provided, further, that no Person
       shall be deemed a "Beneficial Owner" of any security to the extent that
       such Person would not be a "beneficial owner" of such security under Rule
       16a-1(a)(1) under the Exchange Act.

              (f) "Business Day" shall mean any day other than a Saturday,
       Sunday or a day on which banking institutions in the City of New York are
       authorized or obligated by law or executive order to close.

              (g) "close of business" on any given date shall mean 5:00 P.M.,
       Eastern Standard time, on such date; provided, however, that if such date
       is not a Business Day it shall mean 5:00 P.M., Eastern Standard Time, on
       the next succeeding Business Day.

              (h) "Common Stock" shall mean the common stock, $0.01 par value,
       of the Company, except that "Common Stock" when used with reference to
       any Person other than the Company shall mean the capital stock of such
       Person with the greatest aggregate voting power, or the equity securities
       or other equity interest having power to control or direct the
       management, of such Person.

              (i) "Common stock equivalents" shall have the meaning set forth in
       Section 11(a)(iii) hereof.

                                      -3-
<PAGE>   7

              (j) "Current market price" shall have the meaning set forth in
       Section 11(d)(i) hereof.

              (k) "Current Value" shall have the meaning set forth in Section
       11(a)(iii) hereof.

              (l) "Distribution Date" shall have the meaning set forth in
       Section 3(a) hereof.

              (m) "Exchange Act" shall have the meaning set forth in Section
       1(d) hereof.

              (n) "Exempt Investor" shall mean (i) Nevasa Holdings Ltd.,
       together with its Affiliates and Associates, irrespective of their
       beneficial ownership of Common Stock, (ii) the Morgan Stanley Investors
       together with their Affiliates and Associates, provided that at the
       relevant time of determination the beneficial ownership of shares of
       Common Stock of such Persons shall be no more than 21% of the shares of
       Common Stock then outstanding, and (iii) Nunsgate Limited, together with
       its Affiliates and Associates, provided that at the relevant time of
       determination the beneficial ownership of shares of Common Stock of such
       Persons shall not exceed the lesser of (x) the Ownership Limitation or
       (y) 25% of the number of shares of Common Stock then outstanding. No
       Existing Stockholder that is an Exempt Investor shall cease to be an
       Exempt Investor solely by virtue of a purchase from the Public Float
       after the date hereof by the Company or by another Existing Stockholder
       not an Affiliate of such Existing Stockholder.

              (o) "Existing Stockholders" shall mean: (i) Mr. Enrique
       Pescarmona, Mr. Roberto Vivo and Mr. Ricardo Verdaguer; (ii) the spouse
       of any individual named in clause (i); (iii) the lineal descendants of
       any person named in clauses (i) through (ii); (iv) the estate or any
       guardian, custodian or other legal representative of any individual named
       in clauses (i) through (iii); (v) any trust established solely for the
       benefit of any one or more of the individuals named in clauses (i)
       through (iv); (vi) any Person in which all of the equity interests are
       owned, directly or indirectly, by any one or more of the Persons named in
       clauses (i) through (v); (vii) Nevasa Holdings Ltd., (viii) Corporacion
       IMPSA, S.A.; (ix) the Morgan Stanley Investors and their Affiliates; (x)
       Nunsgate Limited and its Affiliates; (xi) Credit Suisse First Boston;
       (xii) Portafolio de Inversiones Suramericana; (xiii) Compania
       Suramericana de Inversiones y Avaluos, (xiii) Compania Suramericana de
       Inversiones; and (xiv) Compania Suramericana de Construcciones.

                                      -4-
<PAGE>   8

              (p) "Expiration Date" shall have the meaning set forth in Section
       7(a) hereof.

              (q) "Final Expiration Date" shall mean the close of business on
       December 31, 2010, unless extended by the Board of Directors of the
       Company as provided in Section 7 hereof.

              (r) "Morgan Stanley Investors" shall mean the Persons collectively
       defined as "Purchasers" in the Securityholders Agreement dated as of
       March 19, 1998 among the Company and the other parties thereto, as
       supplemented or amended, together with the permitted assignees of such
       Persons.

              (s) "Net Additions to the Public Float" shall mean the difference,
       at any relevant time of determination, between sales and purchases of
       shares of Common Stock to and from the Public Float by all Persons since
       February 4, 2000, disregarding for the purpose of this calculation any
       shares of Common Stock purchased by: (i) the Company or any Subsidiary of
       the Company; or (ii) any Existing Stockholder (other than Nunsgate or any
       of its Affiliates and Associates), to the extent that such purchases were
       not at such relevant time of determination disclosed in a public filing
       pursuant to the Exchange Act with the Securities and Exchange Commission;
       provided, however, that if the preceding calculation produces a number
       less than zero, Net Additions to the Public Float shall be equal to zero.

              (t) "Ownership Limitation" shall equal (i) 17,171,199 shares of
       Common Stock (i.e., the number of shares of Common Stock beneficially
       owned by Nunsgate Limited as of February 4, 2000), plus (ii) 3,450,000
       shares of Common Stock (i.e., 30% of the Public Float as of February 4,
       2000), plus (iii) 30% of the Net Additions to the Public Float.

              (u) "Person" shall mean any individual, firm, corporation,
       partnership, company or other entity.

              (v) "Preferred Stock" shall mean shares of the Company's Series B
       Preferred Stock, and, to the extent that there is not a sufficient number
       of shares of Preferred Stock authorized to permit the full exercise of
       the Rights, any other series of such Preferred Stock of the Company
       designated for such purpose containing terms substantially similar to the
       terms of the Series B Preferred Stock.

              (w) "Principal Party" shall have the meaning set forth in Section
       13(b) hereof.

                                      -5-
<PAGE>   9

              (x) "Public Float" shall mean the number of shares of Common Stock
       that are held by the public, including pursuant to a public offering
       registered under the Act (other than a registration relating solely to
       stock option or other employee benefit plans), but shall in no event
       include shares of Common Stock that are (i) beneficially owned by any of
       the Existing Stockholders or any Affiliate of an Existing Stockholder, or
       (ii) which are subject to restrictions on transfer imposed by Rule 144
       under the Act; provided, that any Existing Stockholder may, by written
       notice in accordance with Section 25, request from the Company a
       calculation of the number of shares of Common Stock comprising the Public
       Float as of a specified date, and the Company shall provide this
       information to such Existing Stockholder as soon as practicable;
       provided, further, that the Company's calculation of the Public Float in
       response to any such request shall, absent manifest error, be final and
       conclusive and binding with respect to such Existing Stockholder.

              (y) "Purchase Price" shall have the meaning set forth in Section
       4(a) hereof.

              (z) "Record Date" shall have the meaning set forth in the WHEREAS
       clause at the beginning of this Agreement.

              (aa) "Redemption Price" shall have the meaning set forth in
       Section 23(a) hereof.

              (bb) "Rights" shall have the meaning set forth in the WHEREAS
       clause at the beginning of this Agreement.

              (cc) "Rights Certificates" shall have the meaning set forth in
       Section 3(a) hereof.

              (dd) "Section 11(a)(ii) Event" shall mean any event described in
       Section 11(a)(ii)(A) or (B) hereof.

              (ee) "Section 11(a)(ii) Trigger Date" shall have the meaning set
       forth in Section 11(a)(iii) hereof.

              (ff) "Section 13 Event" shall mean any event described in clause
       (x), (y) or (z) of Section 13(a) hereof.

              (gg) "Spread" shall have the meaning set forth in Section
       11(a)(iii) hereof.

                                      -6-
<PAGE>   10

              (hh) "Stock Acquisition Date" shall mean the first date of a
       public announcement (which, for purposes of this definition, shall
       include, without limitation, a report filed pursuant to Section 13(d)
       under the Exchange Act) by the Company or an Acquiring Person that an
       Acquiring Person has become such.

              (ii) "Subsidiary" shall mean, with reference to any Person, any
       corporation, partnership, company or other entity of which an amount of
       voting securities sufficient to elect at least a majority of the
       directors, managers, trustees or similar persons, of such entity is
       beneficially owned, directly or indirectly, by such Person, or otherwise
       controlled by such Person.

              (jj) "Substitution Period" shall have the meaning set forth in
       Section 11(a)(iii) hereof.

              (kk) "Trading Day" shall have the meaning set forth in Section
       11(d)(i) hereof.

              (ll) "Triggering Event" shall mean any Section 11(a)(ii) Event or
       any Section 13 Event.

       Section 2. Appointment of Rights Agent. The Company hereby appoints the
Rights Agent to act as agent for the Company and the holders of the Rights (who,
in accordance with Section 3 hereof, shall prior to the Distribution Date also
be the holders of the Common Stock) in accordance with the terms and conditions
hereof, and the Rights Agent hereby accepts such appointment. The Company may
from time to time appoint such Co-Rights Agents as it may deem necessary or
desirable.

       Section 3. Issue of Rights Certificates.

              (a) Until the earliest of (i) the close of business on the tenth
       Business Day after the Stock Acquisition Date, (ii) the close of business
       on the tenth Business Day after the latest of (A) the date that a tender
       or exchange offer by any Person (other than the Company, any Subsidiary
       of the Company, any employee benefit plan of the Company or of any
       Subsidiary of the Company, or any Person organized, appointed or
       established by the Company for or pursuant to the terms of any such plan)
       is first published or sent or given within the meaning of Rule 14d-2(a)
       of the General Rules and Regulations under the Exchange Act as in effect
       on the date hereof, if upon consummation thereof, such Person would be
       the Beneficial Owner of 20% or more of the shares of Common Stock then

                                      -7-
<PAGE>   11

       outstanding, or (B) the date upon which all regulatory approvals required
       for the acquisition of stock pursuant to the tender or exchange offer
       referred to in clause (A) have been obtained or waived, or (C) the date
       upon which any approval required of the security holders of the Person
       publishing or sending or giving the tender or exchange offer referred to
       in clause (A), for the acquisition of stock pursuant to such tender or
       exchange offer, is obtained or waived or (iii) the close of business on
       the tenth Business Day after the Board of Directors of the Company
       determines, pursuant to the criteria set forth in Section 11(a)(ii)(B)
       hereof, that a Person is an Adverse Person (the earliest of (i), (ii) and
       (iii) being herein referred to as the "Distribution Date"), (x) the
       Rights will be evidenced (subject to the provisions of paragraph (b) of
       this Section 3) by the certificates for the Common Stock registered in
       the names of the holders of the Common Stock (which certificates for
       Common Stock shall be deemed also to be certificates for Rights) and not
       by separate certificates, and (y) the Rights will be transferable only in
       connection with the transfer of the underlying shares of Common Stock
       (including a transfer to the Company). As soon as practicable after the
       Distribution Date, the Rights Agent will send by first-class, insured,
       postage prepaid mail, to each record holder of the Common Stock as of the
       close of business on the Distribution Date, at the address of such holder
       shown on the records of the Company, one or more rights, certificates, in
       substantially the form of Exhibit A hereto (the "Rights Certificates"),
       evidencing one Right for each share of Common Stock so held, subject to
       adjustment as provided herein. In the event that an adjustment in the
       number of Rights per share of Common Stock has been made pursuant to
       Section 11(o) hereof, at the time of distribution of the Right
       Certificates, the Company shall make the necessary and appropriate
       rounding adjustments (in accordance with Section 14(a) hereof) so that
       Rights Certificates representing only whole numbers of Rights are
       distributed and cash is paid in lieu of any fractional Rights. As of and
       after the Distribution Date, the Rights will be evidenced solely by such
       Rights Certificates.

              (b) As promptly as practicable following the Record Date, the
       Company will send a copy of a Summary of Rights to Purchase Preferred
       Stock, in substantially the form attached hereto as Exhibit B, by
       first-class, postage prepaid mail, to each record holder of the Common
       Stock as of the close of business on the Record Date, at the address of
       such holder shown on the records of the Company. With respect to
       certificates for the Common Stock outstanding as of the Record Date,
       until the Distribution Date, the Rights will be evidenced by such
       certificates for the Common Stock and the registered holders of the
       Common Stock shall also be the registered holders of the associated
       Rights. Until the earlier of the

                                      -8-
<PAGE>   12

       Distribution Date or the Expiration Date, the transfer of any
       certificates representing shares of Common Stock in respect of which
       Rights have been issued shall also constitute the transfer of the Rights
       associated with such shares of Common Stock.

              (c) Rights shall be issued in respect of all shares of Common
       Stock which are issued after the Record Date but prior to the earlier of
       the Distribution Date or the Expiration Date. Certificates representing
       such shares of Common Stock shall also be deemed to be certificates for
       Rights, and certificates issued after the Record Date shall bear the
       following legend:

                     This certificate also evidences and entitles the holder
              hereof to certain Rights as set forth in the Rights Agreement
              between IMPSAT Fiber Networks, Inc. (the "Company") and The Bank
              of New York (the "Rights Agent") dated as of June [ ], 2000 (the
              "Rights Agreement"), the terms of which are hereby incorporated
              herein by reference and a copy of which is on file at the
              principal offices of the Company. Under certain circumstances, as
              set forth in the Rights Agreement, such Rights will be evidenced
              by separate certificates and will no longer be evidenced by this
              certificate. The Company will mail to the holder of this
              certificate a copy of the Rights Agreement, as in effect on the
              date of mailing, without charge promptly after receipt of a
              written request therefor. Under certain circumstances set forth in
              the Rights Agreement, Rights issued to, or held by, any Person who
              is, was or becomes an Acquiring Person, an Adverse Person or any
              Affiliate or Associate thereof (as such terms are defined in the
              Rights Agreement), whether currently held by or on behalf of such
              Person or by any subsequent holder, may become null and void.

With respect to such certificates containing the foregoing legend, until the
earlier of (i) the Distribution Date or (ii) the Expiration Date, the Rights
associated with the Common Stock represented by such certificates shall be
evidenced by such certificates alone and registered holders of Common Stock
shall also be the registered holders of the associated Rights, and the transfer
of any of such certificates shall also constitute the transfer of the Rights
associated with the Common Stock represented by such certificates.

                                      -9-
<PAGE>   13

       Section 4. Form of Rights Certificates.

              (a) The Rights Certificates (and the forms of election to purchase
       shares and of assignment to be printed on the reverse thereof) shall each
       be substantially in the form set forth in Exhibit A hereto and may have
       such marks of identification or designation and such legends, summaries
       or endorsements printed thereon as the Company may deem appropriate and
       as are not inconsistent with the provisions of this Agreement, or as may
       be required to comply with any applicable law or with any rule or
       regulation made pursuant thereto or with any rule or regulation of any
       stock exchange on which the Rights may from time to time be listed, or to
       conform to usage. Subject to the provisions of Section 11 and Section 22
       hereof, the Rights Certificates, whenever distributed, shall be dated as
       of the Record Date and on their face shall entitle the holders thereof to
       purchase such number of one one-hundredths of a share of Preferred Stock
       as shall be set forth therein at the price set forth therein (such
       exercise price per one one-hundredths of a share, the "Purchase Price"),
       but the amount and type of securities purchasable upon the exercise of
       each Right and the Purchase Price thereof shall be subject to adjustment
       as provided herein.

              (b) Any Rights Certificate issued pursuant to Section 3(a) or
       Section 22 hereof that represents Rights beneficially owned by any Person
       known to be: (i) an Acquiring Person, an Adverse Person or any Associate
       or Affiliate of an Acquiring Person or an Adverse Person; (ii) a
       transferee of an Acquiring Person or an Adverse Person (or of any such
       Associate or Affiliate) who becomes a transferee after the Acquiring
       Person or Adverse Person becomes such; or (iii) a transferee of an
       Acquiring Person or an Adverse Person (or of any such Associate or
       Affiliate) who becomes a transferee prior to or concurrently with the
       Acquiring Person or Adverse Person becoming such and receives such Rights
       pursuant to either (A) a transfer (whether or not for consideration) from
       the Acquiring Person or Adverse Person (or from any such Associate or
       Affiliate) to holders of equity interests in such Acquiring Person or
       Adverse Person (or in any such Associate or Affiliate) or to any Person
       with whom such Acquiring Person or Adverse Person (or any such Associate
       or Affiliate) has any continuing agreement, arrangement or understanding
       regarding the transferred Rights or (B) a transfer which the Board of
       Directors of the Company has determined is part of a plan, arrangement or
       understanding which has as a primary purpose or effect avoidance of
       Section 7(e) hereof, and any Rights Certificate issued pursuant to
       Section 6 or Section 11 hereof upon transfer, exchange, replacement or
       adjustment of any other Rights Certificate referred to in this sentence,
       shall when issued contain (to the extent feasible

                                      -10-
<PAGE>   14

       in the circumstances) the following legend, modified as applicable to
       apply to such Person:

              The Rights represented by this Rights Certificate are or were
              beneficially owned by a Person who was or became an [Acquiring]
              [Adverse] Person or an Affiliate or Associate of an [Acquiring]
              [Adverse] Person (as such terms are defined in the Rights
              Agreement). Accordingly, this Rights Certificate and the Rights
              represented hereby may become null and void in the circumstances
              specified in Section 7(e) of such Agreement.

       Section 5. Countersignature and Registration.

              (a) The Rights Certificates shall be executed on behalf of the
       Company by its Chairman of the Board, its President or any Vice
       President, either manually or by facsimile signature, and shall have
       affixed thereto the Company's seal or a facsimile thereof which shall be
       attested by the Secretary or an Assistant Secretary of the Company,
       either manually or by facsimile signature. The Rights Certificates shall
       be countersigned by the Rights Agent, manually or by facsimile signature,
       and shall not be valid for any purpose unless so countersigned. In case
       any officer of the Company who shall have signed any of the Rights
       Certificates shall cease to be such officer of the Company before
       countersignature by the Rights Agent and issuance and delivery by the
       Company, such Rights Certificates, nevertheless, may be countersigned by
       the Rights Agent and issued and delivered by the Company with the same
       force and effect as though the person who signed such Rights Certificates
       had not ceased to be such officer of the Company; and any Rights
       Certificates may be signed on behalf of the Company by any person who, at
       the actual date of the execution of such Rights Certificate, shall be a
       proper officer of the Company to sign such Rights Certificate, although
       at the date of the execution of this Rights Agreement any such person was
       not such an officer.

              (b) Following the Distribution Date, the Rights Agent will keep or
       cause to be kept, at its office designated as the appropriate place for
       surrender of Rights Certificates upon exercise or transfer, books for
       registration and transfer of the Rights Certificates issued hereunder.
       Such books shall show the names and addresses of the respective holders
       of the Rights Certificates, the number of Rights evidenced on its face by
       each of

                                      -11-
<PAGE>   15

       the Rights Certificates and the certificate number and the date of each
       of the Rights Certificates.

       Section 6. Transfer, Splitup, Combination and Exchange of Rights
Certificates; Mutilated, Destroyed, Lost or Stolen Rights Certificates.

              (a) Subject to the provisions of Section 4(b), Section 7(e) and
       Section 14 hereof, at any time after the close of business on the
       Distribution Date, and at or prior to the close of business on the
       Expiration Date, any Rights Certificate or Certificates may be
       transferred, split up, combined or exchanged for another Rights
       Certificate or Certificates, entitling the registered holder to purchase
       a like number of one one-hundredths of a share of Preferred Stock (or,
       following a Triggering Event, Common Stock, other securities, cash or
       other assets, as the case may be) as the Rights Certificate or
       Certificates surrendered then entitled such holder (or former holder in
       the case of a transfer) to purchase. Any registered holder desiring to
       transfer, split up, combine or exchange any Rights Certificate or
       Certificates shall make such request in writing delivered to the Rights
       Agent, and shall surrender the Rights Certificate or Certificates to be
       transferred, split up, combined or exchanged at the office of the Rights
       Agent designated for such purpose. Neither the Rights Agent nor the
       Company shall be obligated to take any action whatsoever with respect to
       the transfer of any such surrendered Rights Certificate until the
       registered holder shall have completed and signed the certificate
       contained in the form of assignment on the reverse side of such Rights
       Certificate and shall have provided such additional evidence of the
       identity of the Beneficial Owner (or former Beneficial Owner) or
       Affiliates or Associates thereof as the Company shall reasonably request.
       Thereupon the Rights Agent shall, subject to Section 4(b), Section 7(e)
       and Section 14 hereof, countersign and deliver to the Person entitled
       thereto a Rights Certificate or Rights Certificates, as the case may be,
       as so requested. The Company may require payment of a sum sufficient to
       cover any tax or governmental charge that may be imposed in connection
       with any transfer, splitup, combination or exchange of Rights
       Certificates.

              (b) Upon receipt by the Company and the Rights Agent of evidence
       reasonably satisfactory to them of the loss, theft, destruction or
       mutilation of a Rights Certificate, and, in case of loss, theft or
       destruction, of indemnity or security reasonably satisfactory to them,
       and reimbursement to the Company and the Rights Agent of all reasonable
       expenses incidental thereto, and upon surrender to the Rights Agent and
       cancellation of the Rights Certificate if mutilated, the Company will
       execute and deliver a new Rights Certificate of like tenor to the Rights
       Agent for countersignature and

                                      -12-
<PAGE>   16

       delivery to the registered owner in lieu of the Rights Certificate so
       lost, stolen, destroyed or mutilated.

       Section 7. Exercise of Rights; Purchase Price; Expiration Date of Rights.

              (a) Subject to Section 7(e) hereof, the registered holder of any
       Rights Certificate may exercise the Rights evidenced thereby (except as
       otherwise provided herein including, without limitation, the restrictions
       on exercisability set forth in Section 9(c), Section 11(a)(iii) and
       Section 23(a) hereof) in whole or in part at any time after the
       Distribution Date upon surrender of the Rights Certificate, with the form
       of election to purchase and the certificate on the reverse side thereof
       duly executed, to the Rights Agent at the office of the Rights Agent
       designated for such purpose, together with payment of the aggregate
       Purchase Price with respect to the total number of one one-hundredths of
       a share of Preferred Stock (or other securities, cash or other assets, as
       the case may be) as to which such surrendered Rights are then
       exercisable, at or prior to the earlier of (i) the Final Expiration Date,
       or (ii) the time at which the Rights are redeemed as provided in Section
       23 hereof (the earlier of (i) and (ii) being herein referred to as the
       "Expiration Date").

              (b) The Purchase Price for each one-hundredths of a share of
       Preferred Stock pursuant to the exercise of a Right shall initially be
       $[ ] and shall be subject to adjustment from time to time as provided in
       Sections 11 and 13(a) hereof and shall be payable in accordance with
       paragraph (c) below.

              (c) Upon receipt of a Rights Certificate representing exercisable
       Rights, with the form of election to purchase and the certificate duly
       executed, accompanied by payment, with respect to each Right so
       exercised, of the Purchase Price per one one-hundredths of a share of
       Preferred Stock (or other shares, securities, cash or other assets, as
       the case may be) to be purchased as set forth below and an amount equal
       to any applicable transfer tax, the Rights Agent shall, subject to
       Section 20(k) hereof thereupon promptly (i)(A) requisition from any
       transfer agent of the shares of Preferred Stock (or make available, if
       the Rights Agent is the transfer agent for such shares) certificates for
       the total number of one one-hundredths of a share of Preferred Stock to
       be purchased and the Company hereby irrevocably authorizes its transfer
       agent to comply with all such requests, or (B) if the Company shall have
       elected to deposit the total number of shares of Preferred Stock issuable
       upon exercise of the Rights hereunder with a depositary agent,
       requisition from the depositary agent depositary receipts representing
       such number of one one-hundredths of a

                                      -13-
<PAGE>   17

       share of Preferred Stock as are to be purchased (in which case
       certificates for the shares of Preferred Stock represented by such
       receipts shall be deposited by the transfer agent with the depositary
       agent) and the Company will direct the depositary agent to comply with
       such request, (ii) requisition from the Company the amount of cash, if
       any, to be paid in lieu of fractional shares in accordance with Section
       14 hereof, (iii) after receipt of such certificates or depositary
       receipts, cause the same to be delivered to or upon the order of the
       registered holder of such Rights Certificate, registered in such name or
       names as may be designated by such holder, and (iv) after receipt
       thereof, deliver such cash, if any, to or upon the order of the
       registered holder of such Rights Certificate. The payment of the Purchase
       Price (as such amount may be reduced pursuant to Section 11(a)(iii)
       hereof) may be made in cash or by certified bank check or money order
       payable to the order of the Company. In the event that the Company is
       obligated to issue other securities (including Common Stock) of the
       Company, pay cash and/or distribute other property pursuant to Section
       11(a) hereof, the Company will make all arrangements necessary so that
       such other securities, cash and/or other property are available for
       distribution by or on behalf of the Rights Agent, if and when
       appropriate.

              (d) In case the registered holder of any Rights Certificate shall
       exercise less than all the Rights evidenced thereby, a new Rights
       Certificate evidencing Rights equivalent to the Rights remaining
       unexercised shall be issued by the Rights Agent and delivered to, or upon
       the order of, the registered holder of such Rights Certificate,
       registered in such name or names as may be designated by such holder,
       subject to the provisions of Section 14 hereof.

              (e) Notwithstanding anything in this Agreement to the contrary,
       from and after the first occurrence of a Section 11(a)(ii) Event, any
       Rights beneficially owned by (i) an Acquiring Person, an Adverse Person
       or an Associate or Affiliate of an Acquiring Person or an Adverse Person,
       (ii) a transferee of an Acquiring Person or an Adverse Person (or of any
       such Associate or Affiliate) who becomes a transferee after the Acquiring
       Person or Adverse Person becomes such, or (iii) a transferee of an
       Acquiring Person or an Adverse Person (or of any such Associate or
       Affiliate) who becomes a transferee prior to or concurrently with the
       Acquiring Person or Adverse Person becoming such and receives such Rights
       pursuant to either (A) a transfer (whether or not for consideration) from
       the Acquiring Person or Adverse Person (or from any such Associate or
       Affiliate) to holders of equity interests in such Acquiring Person or
       Adverse Person (or in any such Associate or Affiliate) or to any Person
       with whom the Acquiring Person or Adverse Person (or any such Associate
       or Affiliate) has any continuing

                                      -14-
<PAGE>   18

       agreement, arrangement or understanding regarding the transferred Rights
       or (B) a transfer which the Board of Directors of the Company has
       determined (whether before or after such transfer) is part of a plan,
       arrangement or understanding which has as a primary purpose or effect the
       avoidance of this Section 7(e), shall become null and void without any
       further action and no holder of such Rights shall have any rights
       whatsoever with respect to such Rights, whether under any provision of
       this Agreement or otherwise. The Company shall use all reasonable efforts
       to insure that the provisions of this Section 7(e) and Section 4(b)
       hereof are complied with, but shall have no liability to any holder of
       Rights Certificates or other Person as a result of its failure to make
       any determinations with respect to an Acquiring Person or Adverse Person
       or any of their respective Affiliates, Associates or transferees
       hereunder.

              (f) Notwithstanding anything in this Agreement to the contrary,
       neither the Rights Agent nor the Company shall be obligated to undertake
       any action with respect to a registered holder upon the occurrence of any
       purported exercise as set forth in this Section 7 unless such registered
       holder shall have (i) completed and signed the certificate contained in
       the form of election to purchase set forth on the reverse side of the
       Rights Certificate surrendered for such exercise, and (ii) provided such
       additional evidence of the identity of the Beneficial Owner (or former
       Beneficial Owner) or Affiliates or Associates thereof as the Company or
       the Rights Agent shall reasonably request.

       Section 8. Cancellation and Destruction of Rights Certificates. All
Rights Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or any of its
agents, be delivered to the Rights Agent for cancellation or in canceled form,
or, if surrendered to the Rights Agent, shall be canceled by it, and no Rights
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement. The Company shall deliver to the Rights
Agent for cancellation and retirement, and the Rights Agent shall so cancel and
retire, any other Rights Certificate purchased or acquired by the Company
otherwise than upon the exercise thereof. The Rights Agent shall deliver all
cancelled Rights Certificates to the Company, or shall, at the written request
of the Company, destroy such cancelled Rights Certificates, and in such case
shall deliver a certificate of destruction thereof to the Company.

       Section 9. Reservation and Availability of Capital Stock.

              (a) The Company covenants and agrees that it will cause to be
       reserved and kept available out of its authorized and unissued shares of

                                      -15-
<PAGE>   19

       Preferred Stock (and, following the occurrence of a Triggering Event, out
       of its authorized and unissued shares of Common Stock and/or other
       securities or out of its authorized and issued shares held in its
       treasury), the number of shares of Preferred Stock (and, following the
       occurrence of a Triggering Event, Common Stock and/or other securities)
       that, as provided in this Agreement, including Section 11(a)(iii) hereof,
       will be sufficient to permit the exercise in full of all outstanding
       Rights.

              (b) So long as the shares of Preferred Stock (and, following the
       occurrence of a Triggering Event, Common Stock and/or other securities)
       issuable and deliverable upon the exercise of the Rights may be listed on
       any national securities exchange, the Company shall use its best efforts
       to cause, from and after such time as the Rights become exercisable, all
       shares reserved for such issuance to be listed on such exchange upon
       official notice of issuance upon such exercise.

              (c) The Company shall use its best efforts to (i) file, as soon as
       practicable following the earliest date after the first occurrence of a
       Section 11(a)(ii) Event on which the consideration to be delivered by the
       Company upon exercise of the Rights has been determined in accordance
       with Section 11(a)(iii) hereof, or as soon as is required by law
       following the Distribution Date, as the case may be, a registration
       statement under the Act, with respect to the securities purchasable upon
       exercise of the Rights on an appropriate form, (ii) cause such
       registration statement to become effective as soon as practicable after
       such filing, and (iii) cause such registration statement to remain
       effective (with a prospectus at all times meeting the requirements of the
       Act) until the earlier of (A) the date as of which the Rights are no
       longer exercisable for such securities, and (B) the date of the
       expiration of the Rights. The Company will also take such action as may
       be appropriate under, or to ensure compliance with, the securities or
       "blue sky" laws of the various states in connection with the
       exercisability of the Rights. The Company may temporarily suspend, for a
       period of time not to exceed ninety (90) days after the date set forth in
       clause (i) of the first sentence of this Section 9(c), the exercisability
       of the Rights in order to prepare and file such registration statement
       and permit it to become effective. Upon any such suspension, the Company
       shall issue a public announcement stating that the exercisability of the
       Rights has been temporarily suspended, as well as a public announcement
       at such time as the suspension is no longer in effect. Notwithstanding
       any provision of this Agreement to the contrary, the Rights shall not be
       exercisable in any jurisdiction, unless the requisite qualification in
       such jurisdiction shall have been obtained and until a registration
       statement has been declared effective.

                                      -16-
<PAGE>   20

              (d) The Company covenants and agrees that it will take all such
       action as may be necessary to ensure that all one one-hundredths of a
       share of Preferred Stock (and, following the occurrence of a Triggering
       Event, Common Stock and/or other securities) delivered upon exercise of
       Rights shall, at the time of delivery of the certificates for such shares
       (subject to payment of the Purchase Price), be duly and validly
       authorized and issued and fully paid and nonassessable.

              (e) The Company further covenants and agrees that it will pay when
       due and payable any and all federal and state transfer taxes and charges
       which may be payable in respect of the issuance or delivery of the Rights
       Certificates and of any certificates for a number of one one-hundredths
       of a share of Preferred Stock (or Common Stock and/or other securities,
       as the case may be) upon the exercise of Rights. The Company shall not,
       however, be required to pay any transfer tax which may be payable in
       respect of any transfer or delivery of Rights Certificates to a Person
       other than, or the issuance or delivery of a number of one one-hundredths
       of a share of Preferred Stock (or Common Stock and/or other securities,
       as the case may be) in respect of a name other than that of, the
       registered holder of the Rights Certificates evidencing Rights
       surrendered for exercise or to issue or deliver any certificates for a
       number of one one-hundredths of a share of Preferred Stock (or Common
       Stock and/or other securities, as the case may be) in a name other than
       that of the registered holder upon the exercise of any Rights until such
       tax shall have been paid (any such tax being payable by the holder of
       such Rights Certificate at the time of surrender) or until it has been
       established to the Company's satisfaction that no such tax is due.

       Section 10. Preferred Stock Record Date. Each person in whose name any
certificate for a number of one one-hundredths of a share of Preferred Stock (or
Common Stock and/or other securities, as the case may be) is issued upon the
exercise of Rights shall for all purposes be deemed to have become the holder of
record of such fractional shares of Preferred Stock (or Common Stock and/or
other securities, as the case may be) represented thereby on, and such
certificate shall be dated, the date upon which the Rights Certificate
evidencing such Rights was duly surrendered and payment of the Purchase Price
(and all applicable transfer taxes) was made; provided, however, that if the
date of such surrender and payment is a date upon which the Preferred Stock (or
Common Stock and/or other securities, as the case may be) transfer books of the
Company are closed, such Person shall be deemed to have become the record holder
of such shares (fractional or otherwise) on, and such certificate shall be
dated, the next succeeding Business Day on which the Preferred Stock (or Common
Stock and/or other securities, as the case may be) transfer books of the Company
are open. Prior to the exercise of the Rights

                                      -17-
<PAGE>   21

evidenced thereby, the holder of a Rights Certificate, as such, shall not be
entitled to any rights of a stockholder of the Company with respect to shares
for which the Rights shall be exercisable, including, without limitation, the
right to vote, to receive dividends or other distributions or to exercise any
preemptive rights, and shall not be entitled to receive any notice of any
proceedings of the Company, except as provided herein.

       Section 11. Adjustment of Purchase Price, Number and Kind of Shares or
Number of Rights. The Purchase Price, the number and kind of shares covered by
each Right and the number of Rights outstanding are subject to adjustment from
time to time as provided in this Section 11.

              (a)(i) In the event the Company shall at any time after the date
       of this Agreement (A) declare a dividend on the Preferred Stock payable
       in shares of Preferred Stock, (B) subdivide the outstanding Preferred
       Stock, (C) combine the outstanding Preferred Stock into a smaller number
       of shares, or (D) issue any shares of its capital stock in a
       reclassification of the Preferred Stock (including any such
       reclassification in connection with a consolidation, statutory share
       exchange or merger in which the Company is the continuing or surviving
       corporation), except as otherwise provided in this Section 11(a) and
       Section 7(e) hereof, the Purchase Price in effect at the time of the
       record date for such dividend or of the effective date of such
       subdivision, combination or reclassification, and the number and kind of
       shares of Preferred Stock or capital stock, as the case may be, issuable
       on such date, shall be proportionately adjusted so that the holder of any
       Right exercised after such time shall be entitled to receive, upon
       payment of the Purchase Price then in effect, the aggregate number and
       kind of shares of Preferred Stock or capital stock, as the case may be,
       which, if such Right had been exercised immediately prior to such date
       and at a time when the Preferred Stock transfer books of the Company were
       open, he would have owned upon such exercise and been entitled to receive
       by virtue of such dividend, subdivision, combination or reclassification.
       If an event occurs which would require an adjustment under both this
       Section 11(a)(i) and Section 11(a)(ii) hereof, the adjustment provided
       for in this Section 11(a)(i) shall be in addition to, and shall be made
       prior to, any adjustment required pursuant to Section 11(a)(ii) hereof.

                     (ii) In the event:

                     (A) any Person (other than the Exempt Investors, the
              Company, any Subsidiary of the Company, any employee benefit plan
              of the Company or of any Subsidiary of the Company, or

                                      -18-
<PAGE>   22

              any Person organized, appointed or established by the Company for
              or pursuant to the terms of any such plan), alone or together with
              its Affiliates and Associates, shall, at any time after the Rights
              Dividend Declaration Date, become the Beneficial Owner of 20% or
              more of the shares of Common Stock then outstanding, unless the
              event causing the 20% threshold to be crossed is a transaction set
              forth in Section 13(a) hereof or

                     (B) subject to the requirements of this Section 11(a)(ii),
              (x) the Board of Directors of the Company shall declare any Person
              (other than the Exempt Investors, the Company, any Subsidiary of
              the Company, any employee benefit plan of the Company or of any
              Subsidiary of the Company, or any Person organized, appointed or
              established by the Company for or pursuant to the terms of any
              such plan) to be an Adverse Person, upon a determination by the
              Board of Directors that such Person, alone or together with its
              Affiliates and Associates, has or is likely to, at any time after
              the Rights Dividend Declaration Date, become the Beneficial Owner
              of 10% or more of the outstanding shares of Common Stock, after
              reasonable inquiry and investigation, including consultation with
              such persons as such directors shall deem appropriate, that (a)
              such Beneficial Ownership by such Person is intended to cause, is
              reasonably likely to cause or would cause directly or indirectly,
              the Company to change its strategic direction under circumstances
              where the Board of Directors believes that such change is not in
              the best interests of the Company and its stockholders, employees,
              customers, suppliers or other constituencies of the Company and
              its Subsidiaries, (b) such Beneficial Ownership by such Person is
              intended to cause, is reasonably likely to cause or would cause
              pressure on the Company to take action or enter into a transaction
              or series of transactions, including by causing a transaction with
              such Person or another Person which would provide such Person with
              short-term financial gain under circumstances where the Board of
              Directors

                                      -19-
<PAGE>   23

              determines that the best long-term interests of the Company and
              its stockholders, but for the actions and possible actions of such
              Person, would not be served by taking such action or entering into
              such transactions or series of transactions at that time or (c)
              such Beneficial Ownership is causing or reasonably likely to cause
              a material adverse impact (including, but not limited to,
              impairment of relationships with customers or impairment of the
              Company's ability to maintain its competitive position) on the
              business or prospects of the Company, or (d) such Beneficial
              Ownership otherwise is determined to be not in the best interests
              of the Company or its stockholders, employees, customers,
              suppliers, or other constituents of the Company or its
              Subsidiaries, and (y) such Person has become the Beneficial Owner
              of 10% or more of the outstanding shares of Common Stock,

then, promptly following the first occurrence of a Section 11(a)(ii) Event,
proper provision shall be made so that each holder of a Right (except as
provided below and in Section 7(e) hereof) shall thereafter have the right to
receive, upon exercise thereof at the then-current Purchase Price in accordance
with the terms of this Agreement, in lieu of a number of one one-hundredths of a
share of Preferred Stock, such number of shares of Common Stock of the Company
as shall equal the result obtained by (x) multiplying the then-current Purchase
Price by the then-number of one one-hundredths of a share of Preferred Stock for
which a Right would have been exercisable immediately prior to the first
occurrence of a Section 11(a)(ii) Event assuming the Distribution Date had
already occurred, and (y) dividing that product (which, following such first
occurrence, shall thereafter be referred to as the "Purchase Price" for each
Right and for all purposes of this Agreement) by 50% of the current market price
(determined pursuant to Section 11(d) hereof) per share of Common Stock on the
date of such first occurrence (such number of shares, the "Adjustment Shares").
Notwithstanding the provisions of Section 11(a)(ii)(B) hereof, the Board of
Directors of the Company may not declare a Person to be an Adverse Person if,
prior to the time that such Person acquired 10% or more of the shares of Common
Stock then outstanding, such Person provided to the Board of Directors in
writing a statement of such Person's purpose and intentions in connection with
the proposed acquisition of Common Stock, together with any other information
reasonably requested of such Person by the Board of Directors, and the Board of
Directors, based on such statement and reasonable inquiry and investigation,
including consultation with such Persons as such directors shall deem
appropriate, determines to notify and

                                      -20-
<PAGE>   24

notifies such Person in writing that it will not declare such Person to be an
Adverse Person; provided, however, that the Board of Directors may expressly
condition in any manner a determination not to declare a Person an Adverse
Person on such conditions as the Board of Directors may select, including,
without limitation, such Person's not acquiring more than a specified amount of
Common Stock and/or on such Person's not taking actions inconsistent with the
purposes and intentions disclosed by such Person in the statement provided to
the Board of Directors. In the event that the Board of Directors should at any
time determine, upon reasonable inquiry and investigation, including
consultation with such Persons as such directors shall deem appropriate, that
such Person has not met or complied with any condition specified by the Board of
Directors pursuant to the preceding sentence, the Board of Directors may at any
time thereafter declare such Person to be an Adverse Person pursuant to the
provisions of this Section 11(a)(ii).

                     (iii) In the event that the number of shares of Common
Stock which are authorized by the Company's amended and restated Certificate of
Incorporation but not outstanding or reserved for issuance for purposes other
than upon exercise of the Rights are not sufficient to permit the exercise in
full of the Rights in accordance with the foregoing subparagraph (ii) of this
Section 11(a), the Company shall: (A) determine the excess of (1) the value of
the Adjustment Shares issuable upon the exercise of a Right (the "Current
Value") over (2) the Purchase Price (such excess, the "Spread"), and (B) with
respect to each Right, make adequate provision to substitute for the Adjustment
Shares, upon the exercise of a Right and payment of the applicable Purchase
Price, (1) cash, (2) a reduction in the Purchase Price, (3) Common Stock or
other equity securities of the Company (including, without limitation, shares,
or units of shares, of preferred stock which the Board of Directors of the
Company has deemed to have substantially the same value as shares of Common
Stock (such shares of preferred stock, "common stock equivalents")), (4) debt
securities of the Company, (5) other assets, or (6) any combination of the
foregoing, having an aggregate value equal to the Current Value (less the amount
of any reduction in the Purchase Price), where such aggregate value has been
determined by the Board of Directors of the Company based upon the advice of one
or more investment or financial advisors selected by the Board of Directors of
the Company; provided, however, if the Company shall not have made adequate
provision to deliver value pursuant to clause (B) above within thirty (30) days
following the later of (x) the first occurrence of a Section 11(a)(ii) Event and
(y) the date on which the Company's right of redemption pursuant to Section
23(a) expires (the later of (x) and (y) being referred to herein as the "Section
11(a)(ii) Trigger Date"), then the Company shall be obligated to deliver, upon
the surrender for exercise of a Right and without requiring payment of the
Purchase Price, shares of Common Stock (to the extent available) and then, if
necessary, cash, which shares and/or cash have an aggregate value equal to the
Spread. If the Board of Directors of the Company shall determine in good faith
that it is likely that

                                      -21-
<PAGE>   25

sufficient additional shares of Common Stock could be authorized for issuance
upon exercise in full of the Rights, the thirty (30) day period set forth above
may be extended to the extent necessary, but not more than ninety (90) days
after the Section 11(a)(ii) Trigger Date, in order that the Company may seek
stockholder approval for the authorization of such additional shares (such
period, as it may be extended, the "Substitution Period"). To the extent that
the Company determines that some action need be taken pursuant to the first
and/or second sentences of this Section 11(a)(iii), the Company (x) shall
provide, subject to Section 7(e) hereof, that such action shall apply uniformly
to all outstanding Rights, and (y) may suspend the exercisability of the Rights
until the expiration of the Substitution Period in order to seek any
authorization of additional shares and/or to decide the appropriate form of
distribution to be made pursuant to such first sentence and to determine the
value thereof. In the event of any such suspension, the Company shall issue a
public announcement stating that the exercisability of the Rights has been
temporarily suspended, as well as a public announcement at such time as the
suspension is no longer in effect. For purposes of this Section 11(a)(iii), the
value of the Common Stock shall be the current market price (as determined
pursuant to Section 11(d) hereof) per share of the Common Stock on the Section
11(a)(ii) Trigger Date and the value of any "common stock equivalent" shall be
deemed to have the same value as the Common Stock on such date.

                     (iv) In lieu of issuing shares of Common Stock in
accordance with subparagraph (ii) of this Section 11(a), the Company may with
respect to each Right, if a majority of members of the Board of Directors
determine that such action is in the best interests of the Company and not
contrary to the interests of the holders of Rights, make adequate provision to
substitute for the Adjustment Shares, (x) upon the surrender for exercise of a
Right and payment of the applicable Purchase Price, (1) cash, (2) a reduction in
Purchase Price, (3) Common Stock, or other equity securities of the Company
(including without limitation common stock equivalents), (4) debt securities of
the Company, (5) other assets or (6) any combination of the foregoing having an
aggregate value equal to the Current Value where such aggregate value has been
determined by the Board of Directors of the Company based upon the advice of one
or more investment or financial advisers selected by the Board of Directors of
the Company or (y) upon the surrender for exercise of a Right and without
requiring payment of the Purchase Price, (1) cash, (2) Common Stock or other
equity securities of the Company (including, without limitation, common stock
equivalents), (3) debt securities of the Company, (4) other assets or (5) any
combination of the foregoing, having an aggregate value equal to the Spread
where such aggregate value has been determined by the Board of Directors of the
Company based upon the advice of one or more investment or financial advisors
selected by the Board of Directors of the Company.

                                      -22-
<PAGE>   26

              (b) In case the Company shall fix a record date for the issuance
       of rights, options or warrants to all holders of Preferred Stock
       entitling them to subscribe for or purchase (for a period expiring within
       forty-five (45) calendar days after such record date) Preferred Stock (or
       shares having the same rights, privileges and preferences as the shares
       of Preferred Stock ("equivalent preferred stock")) or securities
       convertible into Preferred Stock or equivalent preferred stock at a price
       per share of Preferred Stock or per share of equivalent preferred stock
       (or having a conversion price per share, if a security convertible into
       Preferred Stock or equivalent preferred stock) less than the current
       market price (as determined pursuant to Section 11(d) hereof) per share
       of Preferred Stock on such record date, the Purchase Price to be in
       effect after such record date shall be determined by multiplying the
       Purchase Price in effect immediately prior to such record date by a
       fraction, the numerator of which shall be the number of shares of
       Preferred Stock outstanding on such record date, plus the number of
       shares of Preferred Stock which the aggregate offering price of the total
       number of shares of Preferred Stock and/or equivalent preferred stock so
       to be offered (and/or the aggregate initial conversion price of the
       convertible securities so to be offered) would purchase at such current
       market price, and the denominator of which shall be the number of shares
       of Preferred Stock outstanding on such record date, plus the number of
       additional shares of Preferred Stock and/or equivalent preferred stock to
       be offered for subscription or purchase (or into which the convertible
       securities so to be offered are initially convertible). In case such
       subscription price may be paid by delivery of consideration part or all
       of which may be in a form other than cash, the value of such
       consideration shall be as determined in good faith by the Board of
       Directors of the Company, whose determination shall be described in a
       statement filed with the Rights Agent and shall be binding on the Rights
       Agent and the holders of the Rights. Shares of Preferred Stock owned by
       or held for the account of the Company shall not be deemed outstanding
       for the purpose of any such computation. Such adjustment shall be made
       successively whenever such a record date is fixed, and in the event that
       such rights or warrants are not so issued, the Purchase Price shall be
       adjusted to be the Purchase Price which would then be in effect if such
       record date had not been fixed.

              (c) In case the Company shall fix a record date for a distribution
       to all holders of Preferred Stock (including any such distribution made
       in connection with a consolidation, statutory share exchange or merger in
       which the Company is the continuing corporation) of evidences of
       indebtedness, cash (other than a regular quarterly cash dividend out of
       the earnings or retained earnings of the Company), assets (other than a
       dividend payable in Preferred Stock, but including any dividend payable
       in stock

                                      -23-
<PAGE>   27

       other than Preferred Stock) or subscription rights or warrants (excluding
       those referred to in Section 11(b) hereof), the Purchase Price to be in
       effect after such record date shall be determined by multiplying the
       Purchase Price in effect immediately prior to such record date by a
       fraction, the numerator of which shall be the current market price (as
       determined pursuant to Section 11(d) hereof) per share of Preferred Stock
       on such record date, less the fair market value (as determined in good
       faith by the Board of Directors of the Company, whose determination shall
       be described in a statement filed with the Rights Agent) of the portion
       of the cash, assets or evidences of indebtedness so to be distributed or
       of such subscription rights or warrants applicable to a share of
       Preferred Stock and the denominator of which shall be such current market
       price (as determined pursuant to Section 11(d) hereof) per share of
       Preferred Stock. Such adjustments shall be made successively whenever
       such a record date is fixed, and in the event that such distribution is
       not so made, the Purchase Price shall be adjusted to be the Purchase
       Price which would have been in effect if such record date had not been
       fixed.

              (d)(i) For the purpose of any computation hereunder, other than
       computations made pursuant to Section 11(a)(iii) and Section 11(a)(iv)
       hereof, the "current market price" per share of Common Stock on any date
       shall be deemed to be the average of the daily closing prices per share
       of such Common Stock for the thirty (30) consecutive Trading Days (as
       such term is hereinafter defined) immediately prior to such date, and for
       purposes of computations made pursuant to Section 11(a)(iii) and Section
       11(a)(iv) hereof, the "current market price" per share of Common Stock on
       any date shall be deemed to be the average of the daily closing prices
       per share of such Common Stock for the ten (10) consecutive Trading Days
       immediately following such date; provided, however, that in the event
       that the current market price per share of the Common Stock is determined
       during a period following the announcement by the issuer of such Common
       Stock of (A) a dividend or distribution on such Common Stock payable in
       shares of such Common Stock or securities convertible into shares of such
       Common Stock (other than the Rights), or (B) any subdivision, combination
       or reclassification of such Common Stock, and prior to the expiration of
       the requisite thirty (30) Trading Day or ten (10) Trading Day period, as
       set forth above, after the ex-dividend date for such dividend or
       distribution, or the record date for such subdivision, combination or
       reclassification, then, and in each such case, the "current market price"
       shall be properly adjusted to take into account ex-dividend trading. The
       closing price for each day shall be the last sale price, regular way, or,
       in case no such sale takes place on such day, the average of the closing
       bid and asked prices, regular way, in either case as reported in the

                                      -24-
<PAGE>   28

       principal consolidated transaction reporting system with respect to
       securities listed or admitted to trading on the New York Stock Exchange
       or, if the shares of Common Stock are not listed or admitted to trading
       on the New York Stock Exchange, as reported in the principal consolidated
       transaction reporting system with respect to securities listed on the
       principal national securities exchange on which the shares of Common
       Stock are listed or admitted to trading or, if the shares of Common Stock
       are not listed or admitted to trading on any national securities
       exchange, the last quoted price or, if not so quoted, the average of the
       high bid and low asked prices in the over-the-counter market, as reported
       by the National Association of Securities Dealers, Inc. Automated
       Quotation System ("NASDAQ") or such other system then in use, or, if on
       any such date the shares of Common Stock are not quoted by any such
       organization, the average of the closing bid and asked prices as
       furnished by a professional market maker making a market in the Common
       Stock selected by the Board of Directors of the Company. If on any such
       date no market maker is making a market in the Common Stock, the fair
       value of such shares on such date as determined in good faith by the
       Board of Directors of the Company shall be used. The term "Trading Day"
       shall mean a day on which the principal national securities exchange on
       which the shares of Common Stock are listed or admitted to trading is
       open for the transaction of business or, if the shares of Common Stock
       are not listed or admitted to trading on any national securities
       exchange, a Business Day. If the Common Stock is not publicly held or not
       so listed or traded, "current market price" per share shall mean the fair
       value per share as determined in good faith by the Board of Directors of
       the Company, whose determination shall be described in a statement filed
       with the Rights Agent and shall be conclusive for all purposes.

                     (ii) For the purpose of any computation hereunder, the
"current market price" per share of Preferred Stock shall be determined in the
same manner as set forth above for the Common Stock in clause (i) of this
Section 11(d) (other than the last sentence thereof). If the current market
price per share of Preferred Stock cannot be determined in the manner provided
above or if the Preferred Stock is not publicly held or listed or traded in a
manner described in clause (i) of this Section 11(d), the "current market price"
per share of Preferred Stock shall be conclusively deemed to be an amount equal
to 100 (as such number may be appropriately adjusted for such events as stock
splits, stock dividends and recapitalizations with respect to the Common Stock
occurring after the date of this Agreement) multiplied by the current market
price per share of the Common Stock. If neither the Common Stock nor the
Preferred Stock is publicly held or so listed or traded, "current market price"
per share of the Preferred Stock shall mean the fair value per share as
determined in good faith by the Board of Directors of the

                                      -25-
<PAGE>   29

Company, whose determination shall be described in a statement filed with the
Rights Agent and shall be conclusive for all purposes. For all purposes of this
Agreement, the "current market price" of one one-hundredth of a share of
Preferred Stock shall be equal to the "current market price" of one share of
Preferred Stock divided by 100.

              (e) Anything herein to the contrary notwithstanding, no adjustment
       in the Purchase Price shall be required unless such adjustment would
       require an increase or decrease of at least one percent (1%) in the
       Purchase Price; provided, however, that any adjustments which by reason
       of this Section 11(e) are not required to be made shall be carried
       forward and taken into account in any subsequent adjustment. All
       calculations under this Section 11 shall be made to the nearest cent or
       to the nearest ten-thousandth of a share of Common Stock or other share
       or one-millionth of a share of Preferred Stock, as the case may be.
       Notwithstanding the first sentence of this Section 11(e), any adjustment
       required by this Section 11 shall be made no later than the earlier of
       (i) three (3) years from the date of the transaction which mandates such
       adjustment, or (ii) the Expiration Date.

              (f) If as a result of an adjustment made pursuant to Section
       11(a)(ii) or Section 13(a) hereof, the holder of any Right thereafter
       exercised shall become entitled to receive any shares of capital stock
       other than Preferred Stock, thereafter the number of such other shares so
       receivable upon exercise of any Right and the Purchase Price thereof
       shall be subject to adjustment from time to time in a manner and on terms
       as nearly equivalent as practicable to the provisions with respect to the
       Preferred Stock contained in Sections 11(a), (b), (c), (e), (g), (h),
       (i), (j) and (l), and the provisions of Sections 7, 9, 10, 13 and 14
       hereof with respect to the Preferred Stock shall apply on like terms to
       any such other shares.

              (g) All Rights originally issued by the Company subsequent to any
       adjustment made to the Purchase Price hereunder shall evidence the right
       to purchase, at the adjusted Purchase Price, the number of one
       one-hundredths of a share of Preferred Stock purchasable from time to
       time hereunder upon exercise of the Rights, all subject to further
       adjustment as provided herein.

              (h) Unless the Company shall have exercised its election as
       provided in Section 11(i), upon each adjustment of the Purchase Price as
       a result of the calculations made in Sections 11(b) and (c), each Right
       outstanding immediately prior to the making of such adjustment shall
       thereafter evidence the right to purchase, at the adjusted Purchase
       Price, that number of one one-hundredths of a share of Preferred Stock
       (calculated to the nearest one-millionth) obtained by (i) multiplying (x)
       the number of one

                                      -26-
<PAGE>   30

       one-hundredths of a share covered by a Right immediately prior to this
       adjustment, by (y) the Purchase Price in effect immediately prior to such
       adjustment of the Purchase Price, and (ii) dividing the product so
       obtained by the Purchase Price in effect immediately after such
       adjustment of the Purchase Price.

              (i) The Company may elect on or after the date of any adjustment
       of the Purchase Price to adjust the number of Rights, in lieu of any
       adjustment in the number of one one-hundredths of a share of Preferred
       Stock purchasable upon the exercise of a Right. Each of the Rights
       outstanding after the adjustment in the number of Rights shall be
       exercisable for the number of one one-hundredths of a share of Preferred
       Stock for which a Right was exercisable immediately prior to such
       adjustment. Each Right held of record prior to such adjustment of the
       number of Rights shall become that number of Rights (calculated to the
       nearest one tenthousandth) obtained by dividing the Purchase Price in
       effect immediately prior to adjustment of the Purchase Price by the
       Purchase Price in effect immediately after adjustment of the Purchase
       Price. The Company shall make a public announcement of its election to
       adjust the number of Rights, indicating the record date for the
       adjustment, and, if known at the time, the amount of the adjustment to be
       made. This record date may be the date on which the Purchase Price is
       adjusted or any day thereafter, but, if the Rights Certificates have been
       issued, shall be at least ten (10) days later than the date of the public
       announcement. If Rights Certificates have been issued, upon each
       adjustment of the number of Rights pursuant to this Section 11(i), the
       Company shall, as promptly as practicable, cause to be distributed to
       holders of record of Rights Certificates on such record date Rights
       Certificates evidencing, subject to Section 14 hereof, the additional
       Rights to which such holders shall be entitled as a result of such
       adjustment, or, at the option of the Company, shall cause to be
       distributed to such holders of record in substitution and replacement for
       the Rights Certificates held by such holders prior to the date of
       adjustment, and upon surrender thereof, if required by the Company, new
       Rights Certificates evidencing all the Rights to which such holders shall
       be entitled after such adjustment. Rights Certificates so to be
       distributed shall be issued, executed and countersigned in the manner
       provided for herein (and may bear, at the option of the Company, the
       adjusted Purchase Price) and shall be registered in the names of the
       holders of record of Rights Certificates on the record date specified in
       the public announcement.

              (j) Irrespective of any adjustment or change in the Purchase Price
       or the number of one one-hundredths of a share of Preferred Stock
       issuable upon the exercise of the Rights, the Rights Certificates
       theretofore and

                                      -27-
<PAGE>   31

       thereafter issued may continue to express the Purchase Price per one
       one-hundredth of a share and the number of one one-hundredths of a share
       which were expressed in the initial Rights Certificates issued hereunder.

              (k) In any case in which this Section 11 shall require that an
       adjustment in the Purchase Price be made effective as of a record date
       for a specified event, the Company may elect to defer until the
       occurrence of such event the issuance to the holder of any Right
       exercised after such record date of the number of one one-hundredths of a
       share of Preferred Stock and other capital stock or securities of the
       Company, if any, issuable upon such exercise over and above the number of
       one one-hundredths of a share of Preferred Stock and other capital stock
       or securities of the Company, if any, issuable upon such exercise on the
       basis of the Purchase Price in effect prior to such adjustment; provided,
       however, that the Company shall deliver to such holder a due bill or
       other appropriate instrument evidencing such holder's right to receive
       such additional shares (fractional or otherwise) or securities upon the
       occurrence of the event requiring such adjustment.

              (l) Anything in this Section 11 to the contrary notwithstanding,
       the Company shall be entitled to make such reductions in the Purchase
       Price, in addition to those adjustments expressly required by this
       Section 11, as and to the extent that in their good faith judgment the
       Board of Directors of the Company shall determine to be advisable in
       order that any (i) consolidation or subdivision of the Preferred Stock,
       (ii) issuance wholly for cash of any shares of Preferred Stock at less
       than the current market price, (iii) issuance wholly for cash of shares
       of Preferred Stock or securities which by their terms are convertible
       into or exchangeable for shares of Preferred Stock, (iv) stock dividends
       or (v) issuance of rights, options or warrants referred to in this
       Section 11, hereafter made by the Company to holders of its Preferred
       Stock shall not be taxable to such stockholders.

              (m) The Company covenants and agrees that it shall not, at any
       time after the Distribution Date, (i) consolidate with any other Person
       (other than a Subsidiary of the Company in a transaction which complies
       with Section 11(n) hereof), (ii) merge with or into or enter into a
       statutory share exchange with any other Person (other than a Subsidiary
       of the Company in a transaction which complies with Section 11(n)
       hereof), or (iii) sell or transfer (or permit any Subsidiary to sell or
       transfer), in one transaction, or a series of related transactions,
       assets or earning power aggregating more than 50% of the assets or
       earning power of the Company and its Subsidiaries (taken as a whole) to
       any other Person or Persons (other than the Company and/or any of its
       Subsidiaries in one or more transactions each of which

                                      -28-
<PAGE>   32

       complies with Section 11(n) hereof), if (x) at the time of or immediately
       after such consolidation, merger, statutory share exchange, sale or
       transfer there are any rights, warrants or other instruments or
       securities outstanding or agreements in effect which would substantially
       diminish or otherwise eliminate the benefits intended to be afforded by
       the Rights or (y) prior to, simultaneously with or immediately after such
       consolidation, merger, sale or transfer, the stockholders of the Person
       who constitutes, or would constitute, the "Principal Party" for purposes
       of Section 13(a) hereof shall have received a distribution of Rights
       previously owned by such Person or any of its Affiliates and Associates.

              (n) The Company covenants and agrees that, after the Distribution
       Date, it will not, except as permitted by Section 23 or Section 26
       hereof, take (or permit any Subsidiary to take) any action if at the time
       such action is taken it is reasonably foreseeable that such action will
       diminish substantially or otherwise eliminate the benefits intended to be
       afforded by the Rights.

              (o) Anything in this Agreement to the contrary notwithstanding, in
       the event that the Company shall at any time on or after the Rights
       Dividend Declaration Date and prior to the Distribution Date (i) declare
       a dividend on the outstanding shares of Common Stock payable in shares of
       Common Stock, (ii) subdivide the outstanding shares of Common Stock, or
       (iii) combine the outstanding shares of Common Stock into a smaller
       number of shares, the number of Rights associated with each share of
       Common Stock then outstanding, or issued or delivered thereafter but
       prior to the Distribution Date, shall be proportionately adjusted so that
       the number of Rights thereafter associated with each share of Common
       Stock following any such event shall equal the result obtained by
       multiplying the number of Rights associated with each share of Common
       Stock immediately prior to such event by a fraction the numerator of
       which shall be the total number of shares of Common Stock outstanding
       immediately prior to the occurrence of the event and the denominator of
       which shall be the total number of shares of Common Stock outstanding
       immediately following the occurrence of such event.

              (p) Before taking any action that would cause an adjustment
       reducing the Purchase Price below the then par value, if any, of the
       Common Stock issuable upon exercise of the Rights, the Company shall take
       any corporate action which may, in the opinion of its counsel, be
       necessary in order that the Company may validly and legally issue fully
       paid and nonassessable shares of Common Stock at such adjusted Purchase
       Price.

                                      -29-
<PAGE>   33

       Section 12. Certificate of Adjusted Purchase Price or Number of Shares.
Whenever an adjustment is made as provided in Section 11 and Section 13 hereof,
the Company shall (a) promptly prepare a certificate setting forth such
adjustment and a brief statement of the facts accounting for such adjustment,
(b) promptly file with the Rights Agent, and with each transfer agent for the
Preferred Stock and the Common Stock, a copy of such certificate, and (c) mail a
brief summary thereof to each holder of a Rights Certificate (or, if prior to
the Distribution Date, to each holder of a certificate representing shares of
Common Stock) in accordance with Section 25 hereof. The Rights Agent shall be
fully protected in relying on any such certificate and on any adjustment therein
contained and shall not be deemed to have knowledge of such adjustment unless
and until it shall have received such certificate.

       Section 13. Consolidation, Statutory Share Exchange, Merger or Sale or
Transfer of Assets or Earning Power.

              (a) In the event that, following the Stock Acquisition Date,
       directly or indirectly, (x) the Company shall consolidate with, enter
       into a statutory share exchange or merge with and into, any other Person
       (other than a Subsidiary of the Company in a transaction which complies
       with Section 11(n) hereof), and the Company shall not be the continuing
       or surviving corporation of such consolidation, statutory share exchange
       or merger, (y) any Person (other than a Subsidiary of the Company in a
       transaction which complies with Section 11(n) hereof) shall consolidate
       with, enter into a statutory share exchange with, or merge with or into,
       the Company, and the Company shall be the continuing or surviving
       corporation of such consolidation, statutory share exchange or merger
       and, in connection with such consolidation, statutory share exchange or
       merger, all or part of the outstanding shares of Common Stock shall be
       changed into or exchanged for stock or other securities of any other
       Person or cash or any other property, or (z) the Company shall sell or
       otherwise transfer (or one or more of its Subsidiaries shall sell or
       otherwise transfer), in one transaction or a series of related
       transactions, assets or earning power aggregating more than 50% of the
       assets or earning power of the Company and its Subsidiaries (taken as a
       whole) to any Person or Persons (other than the Company or any Subsidiary
       of the Company in one or more transactions each of which complies with
       Section 11(n) hereof), then, and in each such case, proper provision
       shall be made so that: (i) each holder of a Right, except holders
       described in Section 7(e) hereof, shall thereafter have the right to
       receive, upon the exercise thereof at the then-current Purchase Price in
       accordance with the terms of this Agreement, such number of validly
       authorized and issued, fully paid, nonassessable and freely tradeable
       shares of Common Stock of the Principal Party (as such term is
       hereinafter

                                      -30-
<PAGE>   34

       defined), not subject to any liens, encumbrances, rights of first refusal
       or other adverse claims, as shall be equal to the result obtained by (1)
       multiplying the then-current Purchase Price by the number of one
       one-hundredths of a share of Preferred Stock for which a Right is
       exercisable immediately prior to the first occurrence of a Section 13
       Event (or, if a Section 11(a)(ii) Event has occurred prior to the first
       occurrence of a Section 13 Event, multiplying the number of such one
       one-hundredths of a share of Preferred Stock for which a Right was
       exercisable immediately prior to the first occurrence of a Section
       11(a)(ii) Event by the Purchase Price in effect immediately prior to such
       first occurrence), and dividing that product (which, following the first
       occurrence of a Section 13 Event, shall be referred to as the "Purchase
       Price" for each Right and for all purposes of this Agreement) by (2) 50%
       of the current market price (determined pursuant to Section 11(d)(i)
       hereof) per share of the Common Stock of such Principal Party on the date
       of consummation of such Section 13 Event; (ii) such Principal Party shall
       thereafter be liable for, and shall assume, by virtue of such Section 13
       Event, all the obligations and duties of the Company pursuant to this
       Agreement; (iii) the term "Company" shall thereafter be deemed to refer
       to such Principal Party, it being specifically intended that the
       provisions of Section 11 hereof shall apply only to such Principal Party
       following the first occurrence of a Section 13 Event; (iv) such Principal
       Party shall take such steps (including, but not limited to, the
       reservation of a sufficient number of shares of its Common Stock) in
       connection with the consummation of any such transaction as may be
       necessary to assure that the provisions hereof shall thereafter be
       applicable, as nearly as reasonably may be, in relation to its shares of
       Common Stock thereafter deliverable upon the exercise of the Rights; and
       (v) the provisions of Section 11(a)(ii) hereof shall be of no effect
       following the first occurrence of any Section 13 Event.

              (b) "Principal Party" shall mean

                     (i) in the case of any transaction described in clause (x)
              or (y) of the first sentence of Section 13(a), the Person that is
              the issuer of any securities into which shares of Common Stock of
              the Company are converted in such merger, statutory share exchange
              or consolidation, and if no securities are so issued, the Person
              that is the other party to such merger, statutory share exchange
              or consolidation; and

                     (ii) in the case of any transaction described in clause (z)
              of the first sentence of Section 13(a), the Person that is the
              party

                                      -31-
<PAGE>   35

              receiving the greatest portion of the assets or earning power
              transferred pursuant to such transaction or transactions;

provided, however, that in any such case, (1) if the Common Stock of such Person
is not at such time and has not been continuously over the preceding twelve (12)
month period registered under Section 12 of the Exchange Act, and such Person is
a direct or indirect Subsidiary of another Person the Common Stock of which is
and has been so registered, "Principal Party" shall refer to such other Person;
and (2) in case such Person is a Subsidiary, directly or indirectly, of more
than one Person, the Common Stocks of two or more of which are and have been so
registered, "Principal Party" shall refer to whichever of such Persons is the
issuer of the Common Stock having the greatest aggregate market value.

              (c) The Company shall not consummate any such consolidation,
       statutory share exchange, merger, sale or transfer unless the Principal
       Party shall have a sufficient number of authorized shares of its Common
       Stock which have not been issued or reserved for issuance to permit the
       exercise in full of the Rights in accordance with this Section 13 and
       unless prior thereto the Company and such Principal Party shall have
       executed and delivered to the Rights Agent a supplemental agreement
       providing for the terms set forth in paragraphs (a) and (b) of this
       Section 13 and further providing that, as soon as practicable after the
       date of any consolidation, statutory share exchange, merger, sale or
       transfer mentioned in paragraph (a) of this Section 13, the Principal
       Party will:

                     (i) prepare and file a registration statement under the
              Act, with respect to the Rights and the securities purchasable
              upon exercise of the Rights on an appropriate form, and will use
              its best efforts to cause such registration statement to (A)
              become effective as soon as practicable after such filing and (B)
              remain effective (with a prospectus at all times meeting the
              requirements of the Act) until the Expiration Date; and

                     (ii) deliver to holders of the Rights historical financial
              statements for the Principal Party and each of its Affiliates
              which comply in all respects with the requirements for
              registration on Form 10 under the Exchange Act.

The provisions of this Section 13 shall similarly apply to successive mergers,
statutory share exchanges or consolidations or sales or other transfers. In the
event that a Section 13 Event shall occur at any time after the occurrence of a
Section 11(a)(ii) Event, the Rights which have not theretofore been exercised
shall thereafter become exercisable in the manner described in Section 13(a).

                                      -32-
<PAGE>   36

       Section 14. Fractional Rights and Fractional Shares.

              (a) The Company shall not be required to issue fractions of
       Rights, except prior to the Distribution Date as provided in Section
       11(o) hereof, or to distribute Rights Certificates which evidence
       fractional Rights. In lieu of such fractional Rights, there may be paid
       to the registered holders of the Rights Certificates with regard to which
       such fractional Rights would otherwise be issuable, an amount in cash
       equal to the same fraction of the current market value of a whole Right.
       For purposes of this Section 14(a), the current market value of a whole
       Right shall be the closing price of the Rights for the Trading Day
       immediately prior to the date on which such fractional Rights would have
       been otherwise issuable. The closing price of the Rights for any day
       shall be the last sale price, regular way, or in case no such sale takes
       place on such day, the average of the closing bid and asked prices,
       regular way, in either case as reported in the principal consolidated
       transaction reporting system with respect to securities listed or
       admitted to trading on the New York Stock Exchange or, if the Rights are
       not listed or admitted to trading on the New York Stock Exchange, as
       reported in the principal consolidated transaction reporting system with
       respect to securities listed on the principal national securities
       exchange on which the Rights are listed or admitted to trading, or, if
       the Rights are not listed or admitted to trading, on any national
       securities exchange, the last quoted price or if not so quoted, the
       average of the high bid and low asked prices in the over-the-counter
       market, as reported by NASDAQ or such other system then in use or, if on
       any such date the Rights are not quoted by any such organization, the
       average of the closing bid and asked prices as furnished by a
       professional market maker making a market in the Rights selected by the
       Board of Directors of the Company. If on any such date no such market
       maker is making a market in the Rights, the fair value of the Rights on
       such date as determined in good faith by the Board of Directors of the
       Company shall be used.

              (b) The Company shall not be required to issue fractions of shares
       of Preferred Stock (other than fractions which are integral multiples of
       one one-hundredth of a share of Preferred Stock) upon exercise of the
       Rights or to distribute certificates which evidence fractional shares of
       Preferred Stock (other than fractions which are integral multiples of one
       one-hundredths of a share of Preferred Stock). In lieu of fractional
       shares of Preferred Stock that are not integral multiples of one
       one-hundredths of a share of Preferred Stock, the Company may pay to the
       registered holders of Rights Certificates at the time such Rights are
       exercised as herein provided an amount in cash equal to the same fraction
       of the current market value of one one-hundredths of a share of Preferred
       Stock. For purposes of this

                                      -33-
<PAGE>   37

       Section 14(b), the current market value of one one-hundredths of a share
       of Preferred Stock shall be one one-hundredths of the closing price of a
       share of Preferred Stock (as determined pursuant to Section 11(d)(ii)
       hereof) for the Trading Day immediately prior to the date of such
       exercise.

              (c) Following the occurrence of a Triggering Event, the Company
       shall not be required to issue fractions of shares of Common Stock upon
       exercise of the Rights or to distribute certificates which evidence
       fractional shares of Common Stock. In lieu of fractional shares of Common
       Stock, the Company may pay to the registered holders of Rights
       Certificates at the time such Rights are exercised as herein provided an
       amount in cash equal to the same fraction of the current market value of
       one (1) share of Common Stock. For purposes of this Section 14(c), the
       current market value of one share of Common Stock shall be the closing
       price of one share of Common Stock (as determined pursuant to Section
       11(d)(i) hereof) for the Trading Day immediately prior to the date of
       such exercise.

              (d) The holder of a Right by the acceptance of the Rights
       expressly waives his right to receive any fractional Rights or any
       fractional shares upon exercise of a Right, except as permitted by this
       Section 14.

       Section 15. Rights of Action. All rights of action in respect of this
Agreement, other than rights of action vested in the Rights Agent pursuant to
Section 18 hereof, are vested in the respective registered holders of the Rights
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Stock); and any registered holder of any Rights Certificate (or, prior to
the Distribution Date, of the Common Stock), without the consent of the Rights
Agent or of the holder of any other Rights Certificate (or, prior to the
Distribution Date, of the Common Stock), may, in his own behalf and for his own
benefit, enforce, and may institute and maintain any suit, action or proceeding
against the Company to enforce, or otherwise act in respect of, his right to
exercise the Rights evidenced by such Rights Certificate in the manner provided
in such Rights Certificate and in this Agreement. Without limiting the foregoing
or any remedies available to the holders of Rights, it is specifically
acknowledged that the holders of Rights would not have an adequate remedy at law
for any breach of this Agreement and shall be entitled to specific performance
of the obligations hereunder and injunctive relief against actual or threatened
violations of the obligations hereunder of any Person subject to this Agreement.

       Section 16. Agreement of Rights Holders. Every holder of a Right by
accepting the same consents and agrees with the Company and the Rights Agent and
with every other holder of a Right that:

                                      -34-
<PAGE>   38

              (a) prior to the Distribution Date, the Rights will be
       transferable only in connection with the transfer of Common Stock;

              (b) after the Distribution Date, the Rights Certificates are
       transferable only on the registry books of the Rights Agent if
       surrendered at the principal office or offices of the Rights Agent
       designated for such purposes, duly endorsed or accompanied by a proper
       instrument of transfer and with the appropriate forms and certificates
       fully executed;

              (c) subject to Section 6(a) and Section 7(f) hereof, the Company
       and the Rights Agent may deem and treat the person in whose name a Rights
       Certificate (or, prior to the Distribution Date, the associated Common
       Stock certificate) is registered as the absolute owner thereof and of the
       Rights evidenced thereby (notwithstanding any notations of ownership or
       writing on the Rights Certificates or the associated Common Stock
       certificate made by anyone other than the Company or the Rights Agent)
       for all purposes whatsoever, and neither the Company nor the Rights
       Agent, subject to the last sentence of Section 7(e) hereof, shall be
       required to be affected by any notice to the contrary; and

              (d) notwithstanding anything in this Agreement to the contrary,
       neither the Company nor the Rights Agent shall have any liability to any
       holder of a Right or other Person as a result of its inability to perform
       any of its obligations under this Agreement by reason of any preliminary
       or permanent injunction or other order, decree or ruling issued by a
       court of competent jurisdiction or by a governmental, regulatory or
       administrative agency or commission, or any statute, rule, regulation or
       executive order promulgated or enacted by any governmental authority,
       prohibiting or otherwise restraining performance of such obligation;
       provided, however, the Company must use its best efforts to have any such
       order, decree or ruling lifted or otherwise overturned as soon as
       possible.

       Section 17. Rights Certificate Holder Not Deemed a Stockholder. No
holder, as such, of any Rights Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the number of one
one-hundredths of a share of Preferred Stock or any other securities of the
Company which may at any time be issuable on the exercise of the Rights
represented thereby, nor shall anything contained herein or in any Rights
Certificate be construed to confer upon the holder of any Rights Certificate, as
such, any of the rights of a stockholder of the Company or any right to vote for
the election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting stockholders (except as
provided in Section 24 hereof), or to receive dividends or

                                      -35-
<PAGE>   39

subscription rights, or otherwise, until the Right or Rights evidenced by such
Rights Certificate shall have been exercised in accordance with the provisions
hereof.

       Section 18. Concerning the Rights Agent.

              (a) The Company agrees to pay to the Rights Agent reasonable
       compensation for all services rendered by it hereunder and, from time to
       time, on demand of the Rights Agent, its reasonable expenses and counsel
       fees and disbursements and other disbursements incurred in the
       administration and execution of this Agreement and the exercise and
       performance of its duties hereunder. The Company also agrees to indemnify
       the Rights Agent for, and to hold it harmless against, any loss,
       liability, or expense, incurred without gross negligence, bad faith or
       willful misconduct on the part of the Rights Agent, for anything done or
       omitted by the Rights Agent in connection with the acceptance and
       administration of this Agreement, including the costs and expenses of
       defending against any claim of liability in the premises.

              (b) The Rights Agent shall be protected and shall incur no
       liability for or in respect of any action taken, suffered or omitted by
       it in connection with its administration of this Agreement in reliance
       upon any Rights Certificate or certificate for Common Stock or for other
       securities of the Company, instrument of assignment or transfer, power of
       attorney, endorsement, affidavit, letter, notice, direction, consent,
       certificate, statement, or other paper or document believed by it to be
       genuine and to be signed, executed and, where necessary, verified or
       acknowledged, by the proper Person or Persons.

       Section 19. Merger or Consolidation or Change of Name of Rights Agent.

              (a) Any corporation into which the Rights Agent or any successor
       Rights Agent may be merged or with which it may be consolidated, or any
       corporation resulting from any merger or consolidation to which the
       Rights Agent or any successor Rights Agent shall be a party, or any
       corporation succeeding to the corporate trust or stock transfer business
       of the Rights Agent or any successor Rights Agent, shall be the successor
       to the Rights Agent under this Agreement without the execution or filing
       of any paper or any further act on the part of any of the parties hereto;
       provided, however, that such corporation would be eligible for
       appointment as a successor Rights Agent under the provisions of Section
       21 hereof. In case at the time such successor Rights Agent shall succeed
       to the agency created by this Agreement, any of the Rights Certificates
       shall have been countersigned but

                                      -36-
<PAGE>   40

       not delivered, any such successor Rights Agent may adopt the
       countersignature of a predecessor Rights Agent and deliver such Rights
       Certificates so countersigned; and in case at that time any of the Rights
       Certificates shall not have been countersigned, any successor Rights
       Agent may countersign such Rights Certificates either in the name of the
       predecessor or in the name of the successor Rights Agent; and in all such
       cases such Rights Certificates shall have the full force provided in the
       Rights Certificates and in this Agreement.

              (b) In case at any time the name of the Rights Agent shall be
       changed and at such time any of the Rights Certificates shall have been
       countersigned but not delivered, the Rights Agent may adopt the
       countersignature under its prior name and deliver Rights Certificates so
       countersigned; and in case at that time any of the Rights Certificates
       shall not have been countersigned, the Rights Agent may countersign such
       Rights Certificates either in its prior name or in its changed name; and
       in all such cases such Rights Certificates shall have the full force
       provided in the Rights Certificates and in this Agreement.

       Section 20. Duties of Rights Agent. The Rights Agent undertakes the
duties and obligations imposed by this Agreement upon the following terms and
conditions, by all of which the Company and the holders of Rights Certificates,
by their acceptance thereof, shall be bound:

              (a) The Rights Agent may consult with legal counsel (who may be
       legal counsel for the Company), and the opinion of such counsel shall be
       full and complete authorization and protection to the Rights Agent as to
       any action taken or omitted by it in good faith and in accordance with
       such opinion.

              (b) Whenever in the performance of its duties under this Agreement
       the Rights Agent shall deem it necessary or desirable that any fact or
       matter (including, without limitation, the identity of any Acquiring
       Person or Adverse Person and the determination of "current market price")
       be proved or established by the Company prior to taking or suffering any
       action hereunder, such fact or matter (unless other evidence in respect
       thereof be herein specifically prescribed) may be deemed to be
       conclusively proved and established by a certificate signed by the
       Chairman of the Board, the President, any Vice President, the Treasurer,
       any Assistant Treasurer, the Secretary or any Assistant Secretary of the
       Company and delivered to the Rights Agent; and such certificate shall be
       full authorization to the Rights Agent for any action taken or suffered
       in good faith by it under the provisions of this Agreement in reliance
       upon such certificate.

                                      -37-
<PAGE>   41

              (c) The Rights Agent shall be liable hereunder only for its own
       gross negligence, bad faith or willful misconduct; provided, however,
       that the Rights Agent shall not be liable for any indirect, punitive,
       special or consequential damages.

              (d) The Rights Agent shall not be liable for or by reason of any
       of the statements of fact or recitals contained in this Agreement or in
       the Rights Certificates or be required to verify the same (except as to
       its countersignature on such Rights Certificates), but all such
       statements and recitals are and shall be deemed to have been made by the
       Company only.

              (e) The Rights Agent shall not be under any responsibility in
       respect of the validity of this Agreement or the execution and delivery
       hereof (except the due execution hereof by the Rights Agent) or in
       respect of the validity or execution of any Rights Certificate (except
       its countersignature thereof); nor shall it be responsible for any breach
       by the Company of any covenant or condition contained in this Agreement
       or in any Rights Certificate; nor shall it be responsible for any
       adjustment required under the provisions of Section 11 or Section 13
       hereof or responsible for the manner, method or amount of any such
       adjustment or the ascertaining of the existence of facts that would
       require any such adjustment (except with respect to the exercise of
       Rights evidenced by Rights Certificates after receipt of the certificate
       described in Section 12 hereof setting forth any such adjustment); nor
       shall it by any act hereunder be deemed to make any representation or
       warranty as to the authorization or reservation of any shares of Common
       Stock or Preferred Stock to be issued pursuant to this Agreement or any
       Rights Certificate or as to whether any shares of Common Stock or
       Preferred Stock will, when so issued, be validly authorized and issued,
       fully paid and nonassessable.

              (f) The Company agrees that it will perform, execute, acknowledge
       and deliver or cause to be performed, executed, acknowledged and
       delivered all such further and other acts, instruments and assurances as
       may reasonably be required by the Rights Agent for the carrying out or
       performing by the Rights Agent of the provisions of this Agreement.

              (g) The Rights Agent is hereby authorized and directed to accept
       instructions with respect to the performance of its duties hereunder from
       the Chairman of the Board, the President, any Vice President, the
       Secretary, any Assistant Secretary, the Treasurer or any Assistant
       Treasurer of the Company, and to apply to such officers for advice or
       instructions in connection with its duties, and it shall not be liable
       for any action taken or

                                      -38-
<PAGE>   42

       suffered to be taken by it in good faith in accordance with instructions
       of any such officer.

              (h) Any application by the Rights Agent for written instructions
       from the Company may, at the option of the Rights Agent, set forth in
       writing any action proposed to be taken or omitted by the Rights Agent
       under this Rights Agreement and the date on and/or after which such
       action shall be taken or such omission shall be effective. The Rights
       Agent shall not be liable for any action taken by, or omission of, the
       Rights Agent in accordance with a proposal included in any such
       application on or after the date specified in such application (which
       date shall not be less than five Business Days after the date the
       Chairman of the Board, the President, any Vice President, the Secretary,
       any Assistant Secretary, the Treasurer or any Assistant Treasurer of the
       Company actually receives such application, unless any such officer shall
       have consented in writing to an earlier date) unless, prior to taking any
       such action (or the effective date in the case of an omission), the
       Rights Agent shall have received written instructions in response to such
       application specifying the action to be taken or omitted.

              (i) The Rights Agent and any stockholder, director, officer or
       employee of the Rights Agent may buy, sell or deal in any of the Rights
       or other securities of the Company or become pecuniarily interested in
       any transaction in which the Company may be interested, or contract with
       or lend money to the Company or otherwise act as fully and freely as
       though it were not Rights Agent under this Agreement. Nothing herein
       shall preclude the Rights Agent from acting in any other capacity for the
       Company or for any other legal entity.

              (j) The Rights Agent may execute and exercise any of the rights or
       powers hereby vested in it or perform any duty hereunder either itself or
       by or through its attorneys or agents, and the Rights Agent shall not be
       answerable or accountable for any act, default, neglect or misconduct of
       any such attorneys or agents or for any loss to the Company resulting
       from any such act, default, neglect or misconduct; provided, however,
       reasonable care was exercised in the selection and continued employment
       thereof.

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

                                      -39-
<PAGE>   43

              (l) If, with respect to any Rights Certificate surrendered to the
       Rights Agent for exercise or transfer, the certificate attached to the
       form of assignment or form of election to purchase, as the case may be,
       has either not been completed or indicates an affirmative response to
       clause 1 and/or 2 thereof, the Rights Agent shall not take any further
       action with respect to such requested exercise or transfer without first
       consulting with the Company.

       Section 21. Change of Rights Agent. The Rights Agent or any successor
Rights Agent may resign and thereby be discharged from its duties under this
Agreement upon thirty (30) days' notice in writing mailed to the Company, and to
each transfer agent of the Common Stock and Preferred Stock, by registered or
certified mail, and to the holders of the Rights Certificates by first-class
mail. The Company may remove the Rights Agent or any successor Rights Agent upon
thirty (30) days' notice in writing, mailed to the Rights Agent or successor
Rights Agent, as the case may be, and to each transfer agent of the Common Stock
and Preferred Stock, by registered or certified mail, and to the holders of the
Rights Certificates by first-class mail. If the Rights Agent shall resign or be
removed or shall otherwise become incapable of acting, the Company shall appoint
a successor to the Rights Agent. If the Company shall fail to make such
appointment within a period of thirty (30) days after giving notice of such
removal or after it has been notified in writing of such resignation or
incapacity by the resigning or incapacitated Rights Agent or by the holder of a
Rights Certificate (who shall, with such notice, submit his Rights Certificate
for inspection by the Company), then any registered holder of any Rights
Certificate may apply to any court of competent jurisdiction for the appointment
of a new Rights Agent. Any successor Rights Agent, whether appointed by the
Company or by such a court, shall be (a) a corporation or financial institution
organized and doing business under the laws of the United States or of the State
of New York (or of any other state of the United States so long as such
corporation is authorized to do business as a banking institution in the State
of New York), in good standing, and having a principal office in the State of
New York, which is authorized under such laws to exercise corporate trust or
stock transfer powers and is subject to supervision or examination by federal or
state authority and which has at the time of its appointment as Rights Agent a
combined capital and surplus of at least $10,000,000 or (b) an affiliate of a
corporation or financial institution described in clause (a) of this sentence.
After appointment, the successor Rights Agent shall be vested with the same
powers, rights, duties and responsibilities as if it had been originally named
as Rights Agent without further act or deed; but the predecessor Rights Agent
shall deliver, and transfer to the successor Rights Agent any property at the
time held by it hereunder, and execute and deliver any further assurance,
conveyance, act or deed necessary for the purpose. Not later than the effective
date of any such appointment, the Company shall file notice thereof in writing
with the predecessor Rights Agent and

                                      -40-
<PAGE>   44

each transfer agent of the Common Stock and the Preferred Stock, and mail a
notice thereof in writing to the registered holders of the Rights Certificates.
Failure to give any notice provided for in this Section 21, however, or any
defect therein, shall not affect the legality or validity of the resignation or
removal of the Rights Agent or the appointment of the successor Rights Agent, as
the case may be.

       Section 22. Issuance of New Rights Certificates. Notwithstanding any of
the provisions of this Agreement or of the Rights to the contrary, the Company
may, at its option, issue new Rights Certificates evidencing Rights in such form
as may be approved by its Board of Directors to reflect any adjustment or change
in the Purchase Price and the number or kind or class of shares or other
securities or property purchasable under the Rights Certificates made in
accordance with the provisions of this Agreement. In addition, in connection
with the issuance or sale of shares of Common Stock following the Distribution
Date and prior to the redemption or expiration of the Rights, the Company (a)
shall, with respect to shares of Common Stock so issued or sold pursuant to the
exercise of stock options or under any employee plan or arrangement, or upon the
exercise, conversion or exchange of securities hereinafter issued by the
Company, and (b) may, in any other case, if deemed necessary or appropriate by
the Board of Directors of the Company, issue Rights Certificates representing
the appropriate number of Rights in connection with such issuance or sale;
provided, however, that (i) no such Rights Certificate shall be issued if, and
to the extent that, the Company shall be advised by counsel that such issuance
would create a significant risk of material adverse tax consequences to the
Company or the Person to whom such Rights Certificate would be issued, and (ii)
no such Rights Certificate shall be issued if, and to the extent that,
appropriate adjustment shall otherwise have been made in lieu of the issuance
thereof.

       Section 23. Redemption and Termination.

              (a)(i) The Board of Directors of the Company may, at its option,
       at any time prior to the earlier of (x) the close of business on the
       tenth Business Day following the Stock Acquisition Date (or, if the Stock
       Acquisition Date shall have occurred prior to the Record Date, the close
       of business on the tenth Business Day following the Record Date), or (y)
       the Final Expiration Date, redeem all but not less than all the then
       outstanding Rights at a redemption price of $0.01 per Right, as such
       amount may be appropriately adjusted, as determined by the Board of
       Directors, to reflect any stock split, stock dividend or similar
       transaction occurring after the date hereof (such redemption price being
       hereinafter referred to as the "Redemption Price"). Notwithstanding the
       foregoing, but subject to Section 23(a)(ii) hereof, the Board of
       Directors of the Company may not redeem any Rights after the tenth
       Business Day following the effective date

                                      -41-
<PAGE>   45

       of (a) any declaration that any Person is or will become an Adverse
       Person (as provided in Section 11(a)(ii)(B))and, if later, (b) the date
       such Person has become the Beneficial Owner of 10% or more of the
       outstanding shares of Common Stock.

                     (ii) If, following the occurrence of a Stock Acquisition
Date and/or following the expiration of the right of redemption hereunder but
prior to any Triggering Event, (x) a Person who is an Acquiring Person shall
have transferred or otherwise disposed of a number of shares of Common Stock in
one transaction or series of transactions, not directly or indirectly involving
the Company or any of its Subsidiaries, which did not result in the occurrence
of a Triggering Event, such that such Person is thereafter a Beneficial Owner of
less than 10% of the outstanding shares of Common Stock, and (y) there are no
other Persons, immediately following the occurrence of the event described in
clause (x), who are Acquiring Persons or Adverse Persons, then the right of
redemption shall be reinstated and thereafter be subject to the provisions of
this Section 23.

                     (iii) Notwithstanding anything contained in this Agreement
to the contrary, the Rights shall not be exercisable after the first occurrence
of an event described in Section 11(a)(ii) until such time as the Company's
right of redemption hereunder has expired.

                     (iv) The Company may, at its option, pay the Redemption
Price in cash, shares of Common Stock (based on the "current market price," as
defined in Section 11(d)(i) hereof, of the Common Stock at the time of
redemption) or any other form of consideration deemed appropriate by the Board
of Directors.

              (b) Immediately upon the action of the Board of Directors of the
       Company ordering the redemption of the Rights, evidence of which shall
       have been filed with the Rights Agent and without any further action and
       without any notice, the right to exercise the Rights will terminate and
       the only right thereafter of the holders of Rights shall be to receive
       the Redemption Price for each Right so held. Promptly after the action of
       the Board of Directors ordering the redemption of the Rights, the Company
       shall give notice of such redemption to the Rights Agent and the holders
       of the then outstanding Rights by mailing such notice to all such holders
       at each holder's last address as it appears upon the registry books of
       the Rights Agent or, prior to the Distribution Date, on the registry
       books of the Transfer Agent for the Common Stock. Any notice which is
       mailed in the manner herein provided shall be deemed given, whether or
       not the holder receives the notice. Each such notice of redemption will
       state the method by which the payment of the Redemption Price will be
       made.

                                      -42-
<PAGE>   46

       Section 24. Notice of Certain Events.

              (a) In case the Company shall propose, at any time after the
       Distribution Date, (i) to pay any dividend payable in stock of any class
       to the holders of Preferred Stock or to make any other distribution to
       the holders of Preferred Stock (other than a regular quarterly cash
       dividend out of earnings or retained earnings of the Company), or (ii) to
       offer to the holders of Preferred Stock rights or warrants to subscribe
       for or to purchase any additional shares of Preferred Stock or shares of
       stock of any class or any other securities, rights or options, or (iii)
       to effect any reclassification of its Preferred Stock (other than a
       reclassification involving only the subdivision of outstanding shares of
       Preferred Stock), or (iv) to effect any consolidation, statutory share
       exchange or merger into or with any other Person (other than a Subsidiary
       of the Company in a transaction which complies with Section 11(n)
       hereof), or to effect any sale or other transfer (or to permit one or
       more of its Subsidiaries to effect any sale or other transfer), in one
       transaction or a series of related transactions, of more than 50% of the
       assets or earning power of the Company and its Subsidiaries (taken as a
       whole) to any other Person or Persons (other than the Company and/or any
       of its Subsidiaries in one or more transactions each of which complies
       with Section 11(n) hereof), or (v) to effect the liquidation, dissolution
       or winding up of the Company, then, in each such case, the Company shall
       give to each holder of a Rights Certificate, to the extent feasible and
       in accordance with Section 25 hereof, a notice of such proposed action,
       which shall specify the record date for the purposes of such stock
       dividend, distribution of rights or warrants, or the date on which such
       reclassification, consolidation, statutory share exchange, merger, sale,
       transfer, liquidation, dissolution, or winding up is to take place and
       the date of participation therein by the holders of the shares of
       Preferred Stock, if any such date is to be fixed, and such notice shall
       be so given in the case of any action covered by clause (i) or (ii) above
       at least twenty (20) days prior to the record date for determining
       holders of the shares of Preferred Stock for purposes of such action, and
       in the case of any such other action, at least twenty (20) days prior to
       the date of the taking of such proposed action or the date of
       participation therein by the holders of the shares of Preferred Stock,
       whichever shall be the earlier.

              (b) In case any of the events set forth in Section 11(a)(ii)
       hereof shall occur, then, in any such case, (i) the Company shall as soon
       as practicable thereafter give to each holder of a Rights Certificate, to
       the extent feasible and in accordance with Section 25 hereof, a notice of
       the occurrence of such event, which shall specify the event and the
       consequences of the event to holders of Rights under Section 11(a)(ii)

                                      -43-
<PAGE>   47

       hereof, and (ii) all references in the preceding paragraph to Preferred
       Stock shall be deemed thereafter to refer to Common Stock and/or, if
       appropriate, other securities.

       Section 25. Notices. Notices or demands authorized by this Agreement to
be given or made by the Rights Agent or by the holder of any Rights Certificate
to or on the Company shall be sufficiently given or made if delivered by hand,
sent by overnight courier or sent by first-class mail, postage prepaid,
addressed (until another address is filed in writing with the Rights Agent) as
follows:

              IMPSAT Fiber Networks, Inc.
              Alferez Pareja 256 (1107)
              Buenos Aires, Argentina
              Attention: Chief Executive Officer

Subject to the provisions of Section 21, any notice or demand authorized by this
Agreement to be given or made by the Company or by the holder of any Rights
Certificate to or on the Rights Agent shall be sufficiently given or made if
delivered by hand, sent by overnight courier or sent by first-class mail,
postage prepaid, addressed (until another address is filed in writing with the
Company) as follows:

              The Bank of New York
              Global Share Services
              101 Barclay Street
              22nd Floor West
              New York, NY 10286
              Attention: Assistant Treasurer

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Rights Certificate (or, if
prior to the Distribution Date, to the holder of certificates representing
shares of Common Stock) shall be sufficiently given or made if sent by
first-class mail, postage prepaid, addressed to such holder at the address of
such holder as shown on the registry books of the Company.

       Section 26. Supplements and Amendments. Prior to the Distribution Date,
the Company and the Rights Agent shall, if the Company so directs, supplement or
amend any provision of this Agreement without the approval of any holders of
certificates representing shares of Common Stock. From and after the
Distribution Date, the Company and the Rights Agent shall, if the Company so
directs, supplement or amend this Agreement without the approval of any holders
of Rights Certificates in order (i) to cure any ambiguity, (ii) to correct or
supplement any provision contained herein which may be defective or inconsistent
with any other

                                      -44-
<PAGE>   48

provisions herein, (iii) to shorten or lengthen any time period hereunder,
including the Final Expiration Date, (iv) to change or supplement the provisions
hereunder in any other manner which the Company may deem necessary or desirable
and which shall not adversely affect the interests of the holders of Rights
Certificates (other than an Acquiring Person, an Adverse Person or an Affiliate
or Associate of any such Person); provided, this Agreement may not be
supplemented or amended to lengthen, pursuant to clause (iii) of this sentence,
(A) a time period relating to when the Rights may be redeemed at such time as
the Rights are not then redeemable, or (B) any other time period unless such
lengthening of such other time period is for the purpose of protecting,
enhancing or clarifying the rights of, and/or the benefits to, the holders of
Rights. Upon the delivery of a certificate from an appropriate officer of the
Company which states that the proposed supplement or amendment is in compliance
with the terms of this Section 26, the Rights Agent shall execute such
supplement or amendment. Prior to the Distribution Date, the interests of the
holders of Rights shall be deemed coincident with the interests of the holders
of Common Stock.

       Section 27. Successors. All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

       Section 28. Determinations and Actions by the Board of Directors, etc.

       (a) For all purposes of this Agreement, any calculation of the number of
shares of Common Stock outstanding at any particular time, including for
purposes of determining the particular percentage of such outstanding shares of
Common Stock of which any Person is the Beneficial Owner, shall be made in
accordance with the last sentence of Rule 13d3(d)(1)(i) of the General Rules and
Regulations under the Exchange Act as in effect on the date hereof. The Board of
Directors of the Company (or, as set forth herein, certain specified members
thereof) shall have the exclusive power and authority to administer this
Agreement and to exercise all rights and powers specifically granted to the
Board of Directors of the Company or to the Company, or as may be necessary or
advisable in the administration of this Agreement, including, without
limitation, the right and power to (i) interpret the provisions of this
Agreement, and (ii) make all determinations deemed necessary or advisable for
the administration of this Agreement (including, but not limited to, a
determination to redeem or not redeem the Rights, to declare that a Person is an
Adverse Person or to amend this Agreement). All such actions, calculations,
interpretations and determinations (including, for purposes of clause (y) below,
all omissions with respect to the foregoing) which are done or made by the Board
of Directors of the Company in good faith, shall (x) be final, conclusive and
binding on the Company, the Rights Agent, the holders of the Rights and all
other parties, and (y) not subject the Board to any liability to the holders of
the Rights.

                                      -45-
<PAGE>   49

       (b) For purposes of this Agreement, any determination to be made by the
Board of Directors of the Company may be made by a duly constituted committee
thereof if so authorized to act by the Board of Directors pursuant to the
Company's Bylaws, and in such circumstances any reference to the Board of
Directors herein shall be deemed to include a reference to such committee.

       Section 29. Benefits of This Agreement. Nothing in this Agreement shall
be construed to give to any Person other than the Company, the Rights Agent and
the registered holders of the Rights Certificates (and, prior to the
Distribution Date, registered holders of the Common Stock) any legal or
equitable right, remedy or claim under this Agreement; but this Agreement shall
be for the sole and exclusive benefit of the Company, the Rights Agent and the
registered holders of the Rights Certificates (and, prior to the Distribution
Date, registered holders of the Common Stock).

       Section 30. Severability. If any term, provision, covenant or restriction
of this Agreement is held by a court of competent jurisdiction or other
authority to be invalid, void or unenforceable, the remainder of the terms,
provisions, covenants and restrictions of this Agreement shall remain in full
force and effect and shall in no way be affected, impaired or invalidated;
provided, however, that notwithstanding anything in this Agreement to the
contrary, if any such term, provision, covenant or restriction is held by such
court or authority to be invalid, void or unenforceable and the Board of
Directors of the Company determines in its good faith judgment that severing the
invalid language from this Agreement would adversely affect the purpose or
effect of this Agreement, the right of redemption set forth in Section 23 hereof
shall be reinstated and shall not expire until the close of business on the
tenth Business Day following the date of such determination by the Board of
Directors of the Company.

       Section 31. Governing Law. This Agreement, each Right and each Rights
Certificate issued hereunder shall be deemed to be a contract made under the
laws of the State of Delaware and for all purposes shall be governed by and
construed in accordance with the laws of such State applicable to contracts made
and to be performed entirely within such State; provided, however, that the
rights, obligations and duties of the Rights Agent hereunder and under each
Right and each Rights Certificate shall for all purposes be governed by and
construed in accordance with the laws of the State of New York, without
reference to the choice of law doctrine of such State.

                                      -46-
<PAGE>   50

       Section 32. Counterparts. This Agreement may be executed in any number of
counterparts and each of such counterparts shall for all purposes be deemed to
be an original, and all such counterparts shall together constitute but one and
the same instrument.

       Section 33. Descriptive Headings. Descriptive headings of the several
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.

                                      -47-
<PAGE>   51

       IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and their respective corporate seals to be hereunto affixed and
attested, all as of the day and year first above written.

Attest:                                         IMPSAT Fiber Networks, Inc.

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

Attest:
                                                --------------------------------

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

                                      -48-
<PAGE>   52

                                                                       EXHIBIT A

                          Form of Rights Certificate]

Certificate No. R-                _____ Rights

NOT EXERCISABLE AFTER DECEMBER 31, 2010 OR EARLIER IF REDEEMED BY THE COMPANY,
UNLESS EXTENDED BY THE COMPANY. THE RIGHTS ARE SUBJECT TO REDEMPTION, AT THE
OPTION OF THE COMPANY, AT $0.01 PER RIGHT ON THE TERMS SET FORTH IN THE RIGHTS
AGREEMENT. UNDER CERTAIN CIRCUMSTANCES, RIGHTS BENEFICIALLY OWNED BY AN
ACQUIRING PERSON OR AN ADVERSE PERSON (AS SUCH TERMS ARE DEFINED IN THE RIGHTS
AGREEMENT) AND ANY SUBSEQUENT HOLDER OF SUCH RIGHTS MAY BECOME NULL AND VOID.
[THE RIGHTS REPRESENTED BY THIS RIGHTS CERTIFICATE ARE OR WERE BENEFICIALLY
OWNED BY A PERSON WHO WAS OR BECAME AN ACQUIRING [ADVERSE] PERSON OR AN
AFFILIATE OR ASSOCIATE OF AN ACQUIRING [ADVERSE] PERSON (AS SUCH TERMS ARE
DEFINED IN THE RIGHTS AGREEMENT). ACCORDINGLY, THIS RIGHTS CERTIFICATE AND THE
RIGHTS REPRESENTED HEREBY MAY BECOME NULL AND VOID IN THE CIRCUMSTANCES
SPECIFIED IN SECTION 7(e) OF SUCH AGREEMENT.](1)

                               Rights Certificate

                           IMPSAT FIBER NETWORKS, INC.

       This certifies that                , or registered assigns, is the
registered owner of the number of Rights set forth above, each of which entitles
the owner thereof, subject to the terms, provisions and conditions of the Rights
Agreement, dated as of June [ ], 2000 (the "Rights Agreement"), between IMPSAT
Fiber Networks, Inc., a Delaware corporation (the "Company"), and The Bank of
New York (the "Rights Agent"), to purchase from the Company at any time prior to
5:00 P.M. (Eastern Standard time) on December 31, 2010 at the office or offices
of the Rights Agent designated for such purpose, or its successors as Rights
Agent, one one-hundredths of a fully paid, nonassessable share of Series B
Preferred Stock (the "Preferred Stock") of the Company, at a purchase price of
$[ ] per one one-hundredths of a share (the "Purchase Price"), upon presentation
and surrender of this

------------------------
(1) The portion of the legend in brackets shall be inserted only if applicable,
shall be modified to apply to an Acquiring Person or an Adverse Person, as
applicable, and shall replace the preceding sentence.

<PAGE>   53

Rights Certificate with the Form of Election to Purchase and related Certificate
duly executed. The Purchase Price may be paid in cash or by certified bank check
or money order payable to the order of the Company. The number of Rights
evidenced by this Rights Certificate (and the number of shares which may be
purchased upon exercise thereof) set forth above, and the Purchase Price per
share set forth above, are the number and Purchase Price as of June 7, 2000,
based on the Preferred Stock as constituted at such date.

       Upon the occurrence of a Section 11(a)(ii) Event (as such term is defined
in the Rights Agreement), if the Rights evidenced by this Rights Certificate are
beneficially owned by (i) an Acquiring Person, an Adverse Person or an Affiliate
or Associate of any such Person (as such terms are defined in the Rights
Agreement), (ii) a transferee of any such Acquiring Person, Adverse Person,
Associate or Affiliate, or (iii) under certain circumstances specified in the
Rights Agreement, a transferee of a person who, after such transfer, became an
Acquiring Person, an Adverse Person or an Affiliate or Associate of any such
Person, such Rights shall become null and void and no holder hereof shall have
any right with respect to such Rights from and after the occurrence of such
Section 11(a)(ii) Event.

       As provided in the Rights Agreement, the Purchase Price and the number
and kind of shares of Preferred Stock or other securities which may be purchased
upon the exercise of the Rights evidenced by this Rights Certificate are subject
to modification and adjustment upon the happening of certain events, including
Triggering Events (as such term is defined in the Rights Agreement).

       This Rights Certificate is subject to all of the terms, provisions, and
conditions of the Rights Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference is hereby made for a full description of the rights,
limitations of rights, obligations, duties and immunities hereunder of the
Rights Agent, the Company and the holders of the Rights Certificates, which
limitations of rights include the temporary suspension of the exercisability of
such Rights under the specific circumstances set forth in the Rights Agreement.
Copies of the Rights Agreement are available upon written request to the
Company.

       This Rights Certificate, with or without other Rights Certificates, upon
surrender at the principal office or offices of the Rights Agent designated for
such purpose, may be exchanged for another Rights Certificate or Rights
Certificates of like tenor and date evidencing Rights entitling the holder to
purchase a like aggregate number of one one-hundredths of a share of Preferred
Stock as the Rights evidenced by the Rights Certificate or Rights Certificates
surrendered shall have entitled such holder to purchase. If this Rights
Certificate shall be exercised in part, the holder shall be entitled to receive
upon surrender hereof another Rights Certificate or Rights Certificates for the
number of whole Rights not exercised.

       Subject to the provisions of the Rights Agreement, the Rights evidenced
by this Certificate may be redeemed by the Company at its option at a redemption
price of $0.01

                                      -2-
<PAGE>   54

per Right at any time prior to the earliest of the close of business on (i) the
tenth business day following the Stock Acquisition Date, (ii) the tenth business
day following a declaration by the Board of Directors that a Person is an
Adverse Person, or, if later, the date such Person acquires beneficial ownership
of 10% or more of the outstanding Common Stock, and (iii) the Final Expiration
Date. After the expiration of the redemption period, the Company's right of
redemption may be reinstated if an Acquiring Person reduces his beneficial
ownership to less than 10% of the outstanding shares of Common Stock in a
transaction or series of transactions not involving the Company and there are no
other Acquiring Persons or Adverse Persons.

       The Company may (but shall not be required to) issue fractional shares of
Preferred Stock upon the exercise of any Right or Rights evidenced hereby (other
than fractions which are integral multiples of one one-hundredth of a share of
Preferred Stock, which may, at the election of the Company, be evidenced by
depositary receipts), and in lieu thereof a cash payment may be made, as
provided in the Rights Agreement.

       No holder of this Rights Certificate, as such, shall be entitled to vote
or receive dividends or be deemed for any purpose the holder of shares of
Preferred Stock or of any other securities of the Company which may at any time
be issuable on the exercise hereof, nor shall anything contained in the Rights
Agreement or herein be construed to confer upon the holder hereof, as such, any
of the rights of a stockholder of the Company or any right to vote for the
election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or, to
receive notice of meetings or other actions affecting stockholders (except as
provided in the Rights Agreement), or to receive dividends or subscription
rights, or otherwise, until the Right or Rights evidenced by this Rights
Certificate shall have been exercised as provided in the Rights Agreement.

       This Rights Certificate shall not be valid or obligatory for any purpose
until it shall have been countersigned by the Rights Agent.

       WITNESS, the facsimile signature of the proper officers of the Company
and its corporate seal.

Dated as of _______________, ______

ATTEST:                             IMPSAT FIBER NETWORKS, INC.

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

Countersigned:

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

By
   ---------------------------------
    Authorized Signature

                                      -3-
<PAGE>   55

                  [Form of Reverse Side of Rights Certificate]

                               FORM OF ASSIGNMENT

                (To be executed by the registered holder if such
               holder desires to transfer the Rights Certificate.)

FOR VALUE RECEIVED ____________________ hereby

sells, assigns and transfers unto

       (Please print name and address of transferee)

this Rights Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint __________ Attorney, to
transfer the within Rights Certificate on the books of the within-named
Company, with full power of substitution.

Dated: _______________,

                                       Signature

Signature Guaranteed:

                                   Certificate

       The undersigned hereby certifies by checking the appropriate boxes that:

       (1) this Rights Certificate [ ] is [ ] is not being sold, assigned and
transferred by or on behalf of a Person who is or was an Acquiring Person, an
Adverse Person or an Affiliate or Associate of any such Person (as such terms
are defined pursuant to the Rights Agreement);

       (2) after due inquiry and to the best knowledge of the undersigned, it [
] did [ ] did not acquire the Rights evidenced by this Rights Certificate from
any Person who is, was or subsequently became an Acquiring Person, an Adverse
Person or an Affiliate or Associate of any such Person.

Dated: _______________, ______

                                      -4-
<PAGE>   56

                                         Signature

Signature Guaranteed:

                                     NOTICE

       The signature to the foregoing Assignment and Certificate must correspond
to the name as written upon the face of this Rights Certificate in every
particular, without alteration or enlargement or any change whatsoever.

                                      -5-
<PAGE>   57

                          FORM OF ELECTION TO PURCHASE

                      (To be executed if holder desires to
                       exercise Rights represented by the
                              Rights Certificate.)

To:  IMPSAT FIBER NETWORKS, INC.

       The undersigned hereby irrevocably elects to exercise _________ Rights
represented by this Rights Certificate to purchase the shares of Preferred
Stock issuable upon the exercise of the Rights (or such other securities of the
Company or of any other person which may be issuable upon the exercise of the
Rights) and requests that certificates for such shares be issued in the name of
and delivered to:

Please insert social security
or other identifying number

                              (Please print name and address)

       If such number of Rights shall not be all the Rights evidenced by this
Rights Certificate, a new Rights Certificate for the balance of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number

                              (Please print name and address)

Dated: _______________,

                                         Signature

Signature Guaranteed:

                                      -6-
<PAGE>   58

                                        Certificate

       The undersigned hereby certifies by checking the appropriate boxes that:

       (1) the Rights evidenced by this Rights Certificate [ ] are [ ] are not
being exercised by or on behalf of a Person who is or was an Acquiring Person,
an Adverse Person or an Affiliate or Associate of any such Person (as such terms
are defined in the Rights Agreement);

       (2) after due inquiry and to the best knowledge of the undersigned, it
[ ] did [ ] did not acquire the Rights evidenced by this Rights Certificate from
any Person who is, was or became an Acquiring Person, an Adverse Person or an
Affiliate or Associate of any such Person.

Dated: _______________, ______

                                         Signature

Signature Guaranteed:

                                     NOTICE

       The signature to the foregoing Election to Purchase and Certificate must
correspond to the name as written upon the face of this Rights Certificate in
every particular, without alteration or enlargement or any change whatsoever.

                                      -7-
<PAGE>   59

                                                                       EXHIBIT B

                  SUMMARY OF RIGHTS TO PURCHASE PREFERRED STOCK

       On January 12, 2000, the Board of Directors of IMPSAT Fiber Networks,
Inc. (the "Company") declared a dividend distribution of one Right for each
outstanding share of Company Common Stock to stockholders of record at the close
of business on February 15, 2000. One Right will also be distributed for each
share of Common Stock issued after February 15, 2000, until the Distribution
Date (which is described in the next paragraph). Each Right entitles the
registered holder to purchase from the Company a unit consisting of one
one-hundredths of a share (a "Unit") of Series B Preferred Stock (the "Preferred
Stock"), at a Purchase Price of $[ ] per Unit, subject to adjustment. The
description and terms of the Rights are set forth in a Rights Agreement dated as
of June [ ], 2000 (the "Rights Agreement") between the Company and The Bank of
New York, as Rights Agent.

       Initially, the Rights will be attached to all Common Stock certificates
representing shares then outstanding, and no separate Rights Certificates will
be distributed. The Rights will separate from the Common Stock and a
Distribution Date will occur upon the earliest of (i) 10 business days following
a public announcement that a person or group of affiliated or associated persons
(an "Acquiring Person") has acquired, or obtained the right to acquire,
beneficial ownership of 20% or more of the outstanding shares of Common Stock
(the "Stock Acquisition Date"), (ii) 10 business days following the commencement
of a tender offer or exchange offer that would if consummated result in a person
or group beneficially owning 20% or more of such outstanding shares of Common
Stock, subject to certain limitations (or, if later, the date of receipt of any
required regulatory approvals or approvals of the stockholders of such person or
group for such tender or exchange offer), or (iii) 10 business days after the
Board of Directors of the Company shall declare any Person to be an "Adverse
Person," upon a determination that such person, alone or together with its
affiliates and associates, has or will become the Beneficial Owner of 10% or
more of the outstanding shares of Common Stock (provided that any such
determination shall not be effective until such Person has become the Beneficial
Owner of 10% or more of the outstanding shares of Common Stock), including
consultation with such persons as such directors shall deem appropriate, that
(a) such beneficial ownership by such person is intended to cause, is reasonably
likely to cause or would cause the Company to change its strategic direction
under circumstances where the Board of Directors believes that such change is
not in the best interest of the Company and its Stockholders, employees,
customers, suppliers or other constituencies of the Company and its
subsidiaries, or (b) such beneficial ownership by such person is intended to
cause, is reasonably likely to cause or will cause pressure on the Company to
take action or enter into a transaction or series of transactions

                                      -1-
<PAGE>   60
                                                                       EXHIBIT B

including by causing a transaction with such person or other person, intended to
provide such person with short-term financial gain under circumstances where the
Board of Directors determines that the best long-term interests of the Company
and its stockholders would not be served by taking such action or entering into
such transactions or series of transactions at that time or (c) such beneficial
ownership is causing or is reasonably likely to cause a material adverse impact
(including, but not limited to, impairment of relationships with customers or
impairment of the Company's ability to maintain its competitive position) on the
business or prospects of the Company or (d) such beneficial ownership otherwise
is determined to be not in the best interests of the Company and its
stockholders, employees, customers, suppliers, or other constituencies of the
Company or its subsidiaries.

       However, the Board of Directors may not declare a person to be an Adverse
Person if, prior to the time that the person acquired 10% or more of the shares
of Common Stock then outstanding, such person provided to the Board of Directors
in writing a statement of the person's purpose and intentions in connection with
the proposed acquisition of Common Stock, together with any other information
reasonably requested of the person by the Board of Directors, and the Board of
Directors, based on such statement and reasonable inquiry and investigation as
it deems appropriate, determines to notify and notifies such person in writing
that it will not declare the person to be an Adverse Person; provided, however,
that the Board of Directors may expressly condition in any manner a
determination not to declare a person an Adverse Person on such conditions as
the Board of Directors may select, including, without limitation, such person's
not acquiring more than a specified amount of stock and/or on such person's not
taking actions inconsistent with the purposes and intentions disclosed by such
person in the statement provided to the Board of Directors. In the event that
the Board of Directors should at any time determine, upon reasonable inquiry and
investigation, that such person has not met or complied with any conditions
specified by the Board of Directors, the Board of Directors may at any time
thereafter declare the person to be an Adverse Person.

       Until the Distribution Date (i) the Rights will be evidenced by the
Common Stock certificates and will be transferred with and only with such Common
Stock certificates, (ii) new Common Stock certificates issued after February 15,
2000 will contain a notation incorporating the Rights Agreement by reference and
(iii) the surrender for transfer of any certificates for Common Stock
outstanding will also constitute the transfer of the Rights associated with the
Common Stock represented by such certificate.

       The Rights are not exercisable until the Distribution Date and will
expire at the close of business on December 31, 2010, subject to extension by
the Board of Directors, or unless earlier redeemed by the Company as described
below.

                                      -2-
<PAGE>   61
                                                                       EXHIBIT B

       As soon as practicable after the Distribution Date, Rights Certificates
will be mailed to holders of record of the Common Stock as of the close of
business on the Distribution Date and, thereafter, the separate Rights
Certificates alone will represent the Rights. Except for certain issuances in
connection with outstanding options and convertible securities and as otherwise
determined by the Board of Directors, only shares of Common Stock issued prior
to the Distribution Date will be issued with Rights.

       In the event that the Board of Directors determines that a person is an
Adverse Person or a person becomes the beneficial owner of 20% or more of the
then-outstanding shares of Common Stock, each holder of a Right will thereafter
have the right to receive at the time specified in the Rights Agreement, (x)
upon exercise and payment of the exercise price, Common Stock (or, in certain
circumstances, cash, property or other securities of the Company) having a value
equal to two times the exercise price of the Right or (y) at the discretion of
the Board of Directors, upon exercise and without payment of the exercise price,
Common Stock (or, in certain circumstances, cash, property or other securities
of the Company) having a value equal to the difference between the exercise
price of the Right and the value of the consideration which would be payable
under clause (x). Notwithstanding any of the foregoing, following the occurrence
of any of the events set forth in this paragraph, all Rights that are, or (under
certain circumstances specified in the Rights Agreement) were, beneficially
owned by any Acquiring Person or Adverse Person will be null and void. However,
Rights are not exercisable following the occurrence of either of the events set
forth above until such time as the Rights are no longer redeemable by the
Company as set forth below.

       For example, at an exercise price of $200 per Right, each Right not owned
by an Acquiring Person or an Adverse Person (or by certain related parties)
following an event set forth in the preceding paragraph would entitle its holder
to purchase $400 worth of Common Stock (or other consideration, as noted above)
for $200. Assuming that the Common Stock had a per share value of $100 at such
time, the holder of each valid Right would be entitled to purchase four shares
of Common Stock for $200. Alternatively, at the discretion of the Board of
Directors, each Right following an event set forth in the preceding paragraph,
without payment of the exercise price, would entitle its holder to Common Stock
(or other consideration, as noted above) worth $200.

       In the event that, at any time following the Stock Acquisition Date, (i)
the Company is acquired in a merger, statutory share exchange or other business
combination transaction in which the Company is not the surviving corporation,
or (ii) 50% or more of the Company's assets or earning power is sold or
transferred,

                                       -3-
<PAGE>   62
                                                                       EXHIBIT B

each holder of a Right (except Rights which previously have been voided as set
forth above) shall thereafter have the right to receive, upon exercise, common
stock of the acquiring company having a value equal to two times the exercise
price of the Right. The events set forth in this paragraph and in the second
preceding paragraph are referred to as the "Triggering Events."

       The Purchase Price payable, and the number of Units of Preferred Stock or
other securities or property issuable, upon exercise of the Rights are subject
to adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Stock, (ii) if holders of the Preferred Stock are granted certain rights or
warrants to subscribe for Preferred Stock or convertible securities at less than
the current market price of the Preferred Stock, or (iii) upon the distribution
to holders of the Preferred Stock of evidences of indebtedness or assets
(excluding regular quarterly cash dividends) or of subscription rights or
warrants (other than those referred to above).

       With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments amount to at least 1% of the Purchase
Price. No fractional Units will be issued and, in lieu thereof, an adjustment in
cash will be made based on the market price of the Preferred Stock on the last
trading date prior to the date of exercise.

       In general, the Company may redeem the Rights in whole, but not in part,
at a price of $0.01 per Right, at any time until 10 business days following the
Stock Acquisition Date. Moreover, redemption would not be permitted after 10
business days following the effective date of any declaration by the Board of
Directors that any person is an Adverse Person. After the redemption period has
expired, the Company's right of redemption may be reinstated if an Acquiring
Person or Adverse Person reduces his beneficial ownership to less than 10% of
the outstanding shares of Common Stock in a transaction or series of
transactions not involving the Company and there are no other Acquiring Persons
or Adverse Persons. Immediately upon the action of the Board of Directors
ordering redemption of the Rights, the Rights will terminate and the only right
of the holders of Rights will be to receive the $0.01 redemption price.

       Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends. While the distribution of the Rights will not
be taxable to stockholders or to the Company, stockholders may, depending upon
the circumstances, recognize taxable income in the event that the Rights become
exercisable for stock (or other consideration) of the Company or for common
stock of the acquiring company as set forth above.

                                       -4-
<PAGE>   63
                                                                       EXHIBIT B

       Other than certain provisions relating to the principal economic terms of
the Rights under certain specified circumstances, any of the provisions of the
Rights Agreement may be amended by the Board of Directors of the Company prior
to the Distribution Date. After the Distribution Date, the provisions of the
Rights Agreement may be amended by the Board in order to cure any ambiguity, to
make changes which do not adversely affect the interests of holders of Rights
(excluding the interests of any Acquiring Person or Adverse Person), or to
shorten or lengthen any time period under the Rights Agreement; provided,
however, that no amendment to adjust the time period governing redemption shall
be made when the Rights are not redeemable.

       A copy of the Rights Agreement has been filed with the Securities and
Exchange Commission as an Exhibit to a Registration Statement on Form S-4 dated
June [ ], 2000. A copy of the Rights Agreement is available free of charge from
the Company. This summary description of the Rights does not purport to be
complete and is qualified in its entirety by reference to the Rights Agreement,
which is incorporated herein by reference.

                                       -5-

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