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                                                                   EXHIBIT 10.24

                           CHANGE IN CONTROL AGREEMENT

         THIS CHANGE IN CONTROL AGREEMENT is dated as of November 30, 2000
between Cell Pathways, Inc. (together with its successors or assigns as
permitted under this Agreement, the "Company") and Lloyd Glenn ("Executive").

                              W I T N E S S E T H:

         WHEREAS, the Company considers it essential to the best interest of its
stockholders to foster the continuous employment of key management personnel:

         WHEREAS, the Board of Directors of the Company (the "Board") recognizes
that, as is the case with many publicly held corporations, the possibility of a
change in control may exist and that such possibility, and the uncertainty and
questions which it may give rise to among management, may result in the
departure or distraction of management personnel to the detriment of the Company
and its stockholders;

         WHEREAS, the Board has determined that appropriate steps should be
taken to reinforce and encourage the continued attention and dedication of
certain members of the Company's management, including Executive, to their
assigned duties without distraction in the face of potentially disturbing
circumstances arising from the possibility of a change in control of the
Company, although no such change is now contemplated; and

         WHEREAS, in order to induce Executive to remain in the employ of the
Company and in consideration of Executive's undertakings set forth herein, the
Company agrees that Executive shall receive the severance benefits set forth in
this Agreement under the circumstances as described below.

         WHEREAS, the Company and Executive are parties to an Employment
Agreement dated November 29, 2000 (the "Employment Agreement"), and the Company
and Executive intend that the Employment Agreement shall continue in effect
except as specifically provided herein.

         NOW, THEREFORE, in consideration of the premises and mutual covenants
contained herein and for other good and valuable consideration, the Company and
Executive agree as follows:

1.       DEFINITIONS.

                  (a)      "Base Salary" shall mean Executive's annual base
salary payable by the Company.

                  (b)      "Board" shall mean the Board of Directors of the
Company.

                  (c)      "Cause" shall mean any of the following grounds for
termination of Executive's employment:
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                           (i)      Executive is convicted of a crime involving
         moral turpitude.

                           (ii)     Executive willfully refuses or fails to
         perform his or her material duties for the Company (other than a
         failure resulting from Executive's incapacity due to physical or mental
         illness), which refusal or failure has continued for a period of at
         least 30 days after a written notice of demand for substantial
         performance, signed by a duly authorized officer of the Company, has
         been delivered to Executive specifying the manner in which Executive
         has refused or failed substantially to perform.

                           (iii)    Executive engages in gross misconduct in the
         performance of his or her duties that is materially injurious to the
         Company.

For purposes of clauses (ii) and (iii) of this definition, (x) no act or failure
to act on Executive's part shall constitute grounds for termination for Cause
unless done, or omitted to be done, by Executive not in good faith and without
reasonable belief that Executive's act, or failure to act, was in the best
interest of the Company and (y) in the event of a dispute concerning the
application of this provision, no claim by the Company that Cause exists shall
be given effect unless the Company establishes to the Board by clear and
convincing evidence that Cause exists.

                  (d)      "Change in Control" shall mean the occurrence of one
of the following:

                           (i)      any "person" (as such term is used in
         Sections 13(d) and 14(d) of the Exchange Act), other than the Company
         or any trustee or other fiduciary holding securities under an employee
         benefit plan of the Company, any person acquiring securities from the
         Company solely pursuant to written agreement with the Company, or any
         corporation owned, directly or indirectly by the stockholders of the
         Company in substantially the same proportions as their ownership of
         stock in the Company, is or becomes the "beneficial owner" (as defined
         in Rule 13d-3 under the Exchange Act), directly or indirectly, of
         securities of the Company representing 20% or more of the combined
         voting power or the Company's then outstanding securities,

                           (ii)     during any period of two consecutive years
         commencing the day after the date of this Agreement, individuals who at
         the beginning of such period constitute the Board and any new director
         (other than a director designated by a person who has entered into an
         agreement with the Company to effect a transaction described in clauses
         (i), (iii) or (iv) of this Section 1(d)) whose election by the board or
         nomination for election by the Company's stockholders was approved by a
         vote of at least two-thirds of the directors then still in office who
         either were directors at the beginning of the period or whose election
         or nomination for election was previously so approved, cease for any
         reason to constitute at least a majority of the Board,

                           (iii)    the stockholders of the Company approve a
         merger or consolidation of the Company with any other corporation,
         other than a merger or

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         consolidation where no person within the meaning of subsection (i)
         above becomes the "beneficial owner" (as defined above) of 20% or more
         of the resulting voting power and where the voting securities of the
         Company outstanding immediately prior thereto continue to represent
         (either by remaining outstanding or by being converted into voting
         securities of the surviving or controlling entity) more than 50% of the
         combined voting power of the voting securities of the Company or such
         surviving or controlling entity outstanding immediately after such
         merger or consolidation, or

                           (iv)     the stockholders of the Company approve a
         plan of complete liquidation of the Company or an agreement for the
         sale or disposition by the Company of all or substantially all of the
         Company's assets.

                  (e)      "Code" shall mean the Internal Revenue Code of 1986,
as amended.

                  (f)      "Exchange Act" shall mean the Securities Exchange Act
of 1934, as amended.

                  (g)      "Good Reason" shall mean any of the following events,
except in connection with the termination of Executive's employment for Cause,
as a result of death or by Executive other than for Good Reason and except as
provided in the last sentence of this subsection (g):

                           (i)      The assignment to Executive of any duties
         inconsistent with Executive's status as an executive officer of the
         Company or a change in Executive's position and responsibilities that
         represents a substantial diminution of Executive's position and
         responsibilities.

                           (ii)     A decrease in Executive's Base Salary or a
         decrease in the aggregate level of target incentive compensation and
         benefits payable to Executive.

                           (iii)    The failure of the Company to obtain an
         agreement from any successor to assume and agree to perform this
         Agreement, as required by Section 11 hereof.

                           (iv)     The relocation of the offices of the Company
         at which Executive is principally employed to a location more than 50
         miles from the location of such offices immediately prior to the date
         that is six months before the Change in Control, or the Company's
         requiring Executive to be based anywhere other than such offices,
         except for required travel on the Company's business to any extent
         substantially consistent with Executive's business travel obligations
         as of the date of this Agreement.

Notwithstanding the foregoing, Executive's termination of employment for Good
Reason must occur within 90 days after Executive receives written notice of the
event that gives rise to Good Reason, or in the event no such written notice is
received, 90 days after the event that gives rise to Good Reason. Executive
shall not have Good Reason for termination if, within 30 days after the date on
which Executive gives Notice of Termination, as provided in Section 2(b), the
Company corrects

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the action or failure to act that constitutes the grounds for termination for
Good Reason as set forth in Executive's Notice of Termination.

                  (h)      "Notice of Termination" shall mean a notice which
shall indicate the specific termination provision in this Agreement relied upon
and shall set forth in reasonable detail the facts and circumstances claimed to
provide a basis for termination of Executive's employment under the provision so
indicated.

                  (i)      "Termination Upon a Change in Control" shall mean a
termination of Executive's employment described in Section 2(a) below.

                  (j)      "Severance Period" shall mean the two-year period
after Executive's Termination Upon a Change in Control, with respect to which
Executive shall be entitled to receive severance benefits from the Company.

2.       TERMINATION UPON A CHANGE IN CONTROL.

                  (a)      Termination. If a Change in Control of the Company
occurs and the Change in Control transaction is consummated, Executive shall be
entitled to the benefits provided in Section 3 below (i) if Executive's
employment is terminated by the Company without Cause or if Executive terminates
employment for Good Reason, and the termination occurs upon or within two years
following the Change in Control, or (ii) if Executive's employment is terminated
by the Company without Cause within six months prior to the Change in Control
upon the direction or request of another party to the Change in Control.

                  (b)      Notice of Termination. Any purported Termination Upon
a Change in Control shall be communicated by written Notice of Termination to
the other party hereto in accordance with Section 19 below. The Notice of
Termination shall specify an effective date for Executive's termination of
employment, which shall not be less than 15 days after the date of the Notice of
Termination.

3.       COMPENSATION PAYABLE IN THE EVENT OF TERMINATION UPON A CHANGE IN
CONTROL.

                  (a)      If Executive's employment terminates upon a
Termination Upon a Change in Control, Executive shall be entitled to receive the
following payments and benefits from the Company promptly following the later of
his or her termination of employment or the consummation of the Change in
Control:

                           (i)      Executive shall receive a lump sum payment
         of his or her unpaid Base Salary earned through his or her date of
         termination and a pro-rated amount of the annual incentive bonus that
         Executive would have received for the year of termination. The
         pro-rated bonus shall be computed as the target annual bonus in effect
         for Executive for the year in which his or her termination of
         employment occurs, multiplied by a fraction (i) the

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         numerator of which is the number of the days in such year preceding
         Executive's termination date and (ii) the denominator of which is 365.

                           (ii)     Executive shall receive a lump-sum payment
         equal to two times Executive's Base Salary and annual incentive bonus.
         Executive's Base Salary shall be based on Executive's Base Salary in
         effect at Executive's termination date or the date of the Change in
         Control, whichever is higher. The annual incentive bonus shall be based
         on Executive's target annual bonus in effect at Executive's termination
         date or the date of the Change in Control, whichever is higher.

                           (iii)    The Company shall pay Executive an amount
         equal to the after-tax cost to Executive of continuing the Company's
         medical and dental coverage in effect for Executive, and, where
         applicable, his or her spouse and dependents, for the Severance Period
         as if Executive had continued in employment during the Severance
         Period. The COBRA health care continuation coverage period under
         Section 4980B of the Code shall run concurrently with the period
         described in the preceding sentence.

                           (iv)     Executive shall receive a lump sum payment
         equal to the matching contributions that the Company would have made
         for Executive under the Company's 401(k) plan and any supplemental
         defined contribution plan applicable to Executive, as in effect
         immediately before Executive's termination of employment, had Executive
         continued in employment for the Severance Period receiving Executive's
         compensation and making the same level of contributions to the
         applicable plans as in effect immediately before Executive's
         termination date.

                           (v)      All stock options and restricted stock with
         respect to stock of the Company that are then held by Executive shall
         become fully vested and exercisable as of Executive's termination date
         (if not already vested and exercisable pursuant to the terms of the
         applicable plan). All stock options granted on or after the date of
         this Agreement, and all nonqualified stock options granted before the
         date of this Agreement, shall remain exercisable until the later of (A)
         the end of the post-termination exercise period provided under the
         applicable option agreement or (B) one year after Executive's
         termination date (but not later than the expiration of the option
         term).

                           (vi)     Executive shall receive outplacement
         assistance services for a period of 12 months (for a cost not to exceed
         a total of $10,000) provided by an outplacement agency selected by
         Executive.

                           (vii)    Reimbursement for out-of-pocket business
         expenses properly incurred but not yet reimbursed by the Company.

                           (viii)   Any other amounts earned, accrued or owing
         but not yet paid and any other benefits in accordance with the terms of
         any applicable plans and programs of the Company; provided, however,
         that the severance benefits provided under this Section 3 shall

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         be in lieu of and shall replace any severance benefits due under the
         Employment Agreement or any severance plan or other agreement of the
         Company.

                  (b)      Notwithstanding the foregoing, if Executive's
employment terminates on account of disability, any benefits payable pursuant to
this Section 3 shall be reduced by any disability benefits received by Executive
under any long-term disability plan maintained by the Company that covers
Executive.

4.       TERMINATION FOR CAUSE, DEATH OR BY EXECUTIVE WITHOUT GOOD REASON.
Executive shall not be entitled to the benefits provided in Section 3 if
Executive's employment terminates for Cause or death, or by Executive without
Good Reason.

5.       INCREASE IN PAYMENTS UPON A CHANGE IN CONTROL.

                  (a)      Anything in this Agreement to the contrary
notwithstanding, but subject to subsection (b) below, in the event that it shall
be determined that any payment or distribution by the Company to or for the
benefit of Executive, whether paid or payable or distributed or distributable
pursuant to the terms of this Agreement or otherwise (a "Payment"), would
constitute an "excess parachute payment" within the meaning of Section 280G of
the Code, the Company shall pay Executive an additional amount (the "Gross-Up
Payment") such that the net amount retained by Executive after deduction of any
excise tax imposed under Section 4999 of the Code, and any federal, state and
local income tax, employment tax and excise tax imposed upon the Gross-Up
Payment, shall be equal to the Payment.

                  (b)      Notwithstanding subsection (a), and notwithstanding
any other provisions of this Agreement, if the net after-tax benefit to
Executive of receiving the Gross-Up Payment does not equal or exceed the greater
of (i) $50,000 or (ii) 110% of the Safe Harbor Amount (as defined below) (as
compared to the net-after tax proceeds to Executive resulting from elimination
of the Gross-Up Payment and reduction of the Payments to the Safe Harbor
Amount), then (i) the Company shall not pay Executive the Gross-Up Payment and
(ii) the Payments due to Executive under this Agreement shall be reduced so that
the Parachute Value (as defined below) of all Payments, in the aggregate, equals
the Safe Harbor Amount. Such reduction shall be carried out in such a manner as
to maximize the value of the Payments received by Executive while still reducing
them to the foregoing reduced amount. The term "Parachute Value" means the
present value as of the date of the Change in Control of the portion of such
Payment that constitutes a "parachute payment" under Section 280G(b)(2) of the
Code, as determined by the Accounting Firm (as defined below). The term "Safe
Harbor Amount" means 2.99 times the Executive's "base amount," within the
meaning of Section 280G(b)(3) of the Code.

                  (c)      For purposes of determining the amount of the
Gross-Up Payment, unless Executive specifies that other rates apply, Executive
shall be deemed to pay federal income tax and employment taxes at the highest
marginal rate of federal income and employment taxation in the calendar year in
which the Gross-Up Payment is to be made and state and local income taxes

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at the highest marginal rate of taxation in the state and locality of
Executive's residence on Executive's date of termination, net of the maximum
reduction in federal income taxes that may be obtained from the deduction of
such state and local taxes.

                  (d)      All determinations to be made under this Section 5
shall be made by the Company's independent public accountant immediately prior
to the Change in Control ("Accounting Firm"), which Accounting Firm shall
provide its determinations and any supporting calculations both to the Company
and Executive within 20 days after the Change in Control. Any such determination
by the Accounting Firm shall be binding upon the Company and Executive. Within
ten days after the Accounting Firm's determination, the Company shall pay the
Gross-Up Payment to Executive.

                  (e)      Executive shall notify the Company in writing of any
claim by the Internal Revenue Service that, if successful, would require the
payment by the Company of a Gross-Up Payment. Such notification shall be given
as soon as practicable but no later than ten business days after Executive knows
of such claim and shall apprise the Company of the nature of such claim and the
date on which such claim is requested to be paid. Executive shall not pay such
claim prior to the expiration of the 30-day period following the date on which
Executive gives such notice to the Company (or such shorter period ending on the
date that any payment of taxes with respect to such claim is due). If the
Company notifies Executive in writing prior to the expiration of such period
that it desires to contest such claim, Executive shall:

                           (i)      give the Company any information reasonably
         requested by the Company relating to such claim,

                           (ii)     take such action in connection with
         contesting such claim as the Company shall reasonably request in
         writing from time to time, including, without limitation, accepting
         legal representation with respect to such claim by an attorney
         reasonably selected by the Company,

                           (iii)    cooperate with the Company in good faith in
         order to contest such claim effectively, and

                           (iv)     permit the Company to participate in any
         proceedings relating to such claim;

provided, however, that the Company shall bear and pay directly all costs and
expenses (including additional interest and penalties) incurred in connection
with such contest and shall indemnify and hold Executive harmless, on an
after-tax basis, for any excise tax, income tax or employment tax, including
interest and penalties, with respect thereto, imposed as a result of such
representation and payment of costs and expenses. Without limitation on the
foregoing provisions of this subsection (e), the Company shall control all
proceedings taken in connection with such contest and, at its sole option, may
pursue or forego any and all administrative appeals, proceedings, hearings and

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conferences with the taxing authority in respect of such claim and may, at its
sole option, either direct Executive to pay the tax claimed and sue for a refund
or contest the claim in any permissible manner, and Executive agrees to
prosecute such contest to a termination before any administrative tribunal, in a
court of initial jurisdiction and in one or more appellate courts, as the
Company shall determine. If the Company directs Executive to pay such claim and
sue for a refund, the Company shall advance the amount of such payment to
Executive, on an interest-free basis and shall indemnify and hold Executive
harmless, on an after-tax basis, from any excise tax, income tax or employment
tax, including interest or penalties with respect thereto, imposed with respect
to such advance or with respect to any imputed income with respect to such
advance. Any extension of the statute of limitations relating to payment of
taxes for the taxable year of Executive with respect to which such contested
amount is claimed to be due shall be limited solely to such contested amount.
The Company's control of the contest shall be limited to issues with respect to
which a Gross-Up Payment would be payable hereunder, and Executive shall be
entitled to settle or contest, as the case may be, any other issue raised by the
Internal Revenue Service or any other taxing authority.

                  (f)      If, after the receipt by Executive of an amount
advanced by the Company pursuant to this Section, Executive becomes entitled to
receive any refund with respect to such claim, Executive shall (subject to the
Company's complying with the requirements of this Section 5) promptly pay to the
Company the amount of such refund, together with any interest paid or credited
thereon after taxes applicable thereto. If, after the receipt by Executive of an
amount advanced by the Company pursuant to this Section 5, a determination is
made that Executive shall not be entitled to any refund with respect to such
claim and the Company does not notify Executive in writing of its intent to
contest such denial of refund prior to the expiration of 30 days after such
determination, then such advance shall be forgiven and shall not be required to
be repaid and the amount of such advance shall offset, to the extent thereof,
the amount of Gross-Up Payment required to be paid.

                  (g)      All of the fees and expenses of the Accounting Firm
in performing the determinations referred to in this Section 5 shall be borne
solely by the Company. The Company agrees to indemnify and hold harmless the
Accounting Firm from any and all claims, damages and expenses resulting from or
relating to its determinations pursuant to Section 5, except for claims, damages
or expenses resulting from the gross negligence or willful misconduct of the
Accounting Firm.

6.       CONFIDENTIAL INFORMATION. Executive recognizes and acknowledges that,
by reason of Executive's employment by and service to the Company during and, if
applicable, after the period of Executive's employment, Executive will continue
to have access to certain confidential and proprietary information relating to
the business of the Company, which may include, but is not limited to, trade
secrets, trade "know-how," customer information, supplier information, cost and
pricing information, marketing and sales techniques, strategies and programs,
computer programs and software and financial information (collectively referred
to as "Confidential Information"). Executive acknowledges that such Confidential
Information is a valuable and unique asset of the Company and Executive
covenants that Executive will not, unless expressly authorized in writing by the
Board, at any time during the course of Executive's employment, use any
Confidential Information or divulge or disclose any Confidential Information to
any person, firm

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or corporation except in connection with the performance of Executive's duties
for the Company and in a manner consistent with the Company's policies regarding
Confidential Information. Executive also covenants that at any time after the
termination of such employment, Executive will not use any Confidential
Information or divulge or disclose any Confidential Information to any person,
firm or corporation, unless such information is in the public domain through no
fault of Executive or except when required to do so by law or legal process, in
which case Executive will inform the Company in writing promptly of such
required disclosure, but in any event at least two business days prior to
disclosure. All written Confidential Information (including, without limitation,
in any computer or other electronic format) which comes into Executive's
possession during the course of Executive's employment shall remain the property
of the Company. Except as required in the performance of Executive's duties for
the Company, or unless expressly authorized in writing by the Board, Executive
shall not remove any written Confidential Information from the Company's
premises, except in connection with the performance of Executive's duties for
the Company and in a manner consistent with the Company's policies regarding
Confidential Information. Upon termination of Executive's employment, Executive
agrees immediately to return to the Company all written Confidential Information
in Executive's possession. For the purposes of this Section 6, the term
"Company" shall be deemed to include the Company, its subsidiaries and their
successors.

7.       NON-COMPETITION; NON-SOLICITATION.

                  (a)      During Executive's employment by the Company and for
a period of six months after Executive's Termination Upon a Change in Control,
if Executive receives the benefits set forth in Section 3 hereof, Executive will
not, except with the prior written consent of the Board, directly or indirectly,
own, manage, operate, join, control, finance or participate in the ownership,
management, operation, control or financing of, or be connected as an officer,
director, employee, partner, principal, agent, representative, consultant or
otherwise with, or use or permit Executive's name to be used in connection with,
any business or enterprise which is engaged in any business that is competitive
with any business or enterprise in which the Company is engaged, during
Executive's employment or (with respect to the application of this covenant
after Executive's termination of employment) at the date of Executive's
termination of employment. Based upon the Company's current and anticipated
programs, competition with the Company shall be understood to be managing,
advising on or engaging in the research, discovery, pharmaceutical development,
clinical development, manufacture, application, delivery or commercialization of
compounds designed to inhibit or induce a cyclic GMP-phosphodiesterase for the
purposes of the inhibition or induction of apoptosis and to be utilized for the
treatment or prevention or precancerous or cancerous conditions.

                  (b)      The foregoing restrictions shall not be construed to
prohibit the ownership by Executive of less than five percent of any class of
securities of any corporation which is engaged in any of the foregoing
businesses having a class of securities registered pursuant to the Exchange Act,
provided that such ownership represents a passive investment and that neither
Executive nor any group of persons including Executive in any way, either
directly or indirectly, manages or exercises control of any such corporation,
guarantees any of its financial obligations, otherwise takes any part in its
business, other than exercising Executive's rights as a shareholder, or seeks to
do any of the

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foregoing.

                  (c)      Executive further covenants and agrees that during
Executive's employment by the Company and for a period of six months after
Executive's Termination Upon a Change in Control, if Executive receives the
benefits set forth in Section 3 hereof, Executive will not, except with the
prior written consent of the Board, directly or indirectly, solicit or hire, or
encourage the solicitation or hiring of, any person who was a managerial or
higher level employee of the Company at any time during the term of Executive's
employment by the Company by any employer other than the Company for any
position as an employee, independent contractor, consultant or otherwise. The
foregoing covenant of Executive shall not apply to any person after 12 months
have elapsed after the date on which such person's employment by the Company has
terminated.

                  (d)      For the purposes of this Section 7, the term
"Company" shall be deemed to include the Company, its subsidiaries and their
successors.

8.       EQUITABLE RELIEF.

                  (a)      Executive acknowledges and agrees that the
restrictions contained in Sections 6 and 7 are reasonable and necessary to
protect and preserve the legitimate interests, properties, goodwill and business
of the Company, that the Company would not have entered into this Agreement in
the absence of such restrictions and that irreparable injury will be suffered by
the Company should Executive breach any of the provisions of those Sections.
Executive represents and acknowledges that (i) Executive has been advised by the
Company to consult Executive's own legal counsel in respect of this Agreement,
and (ii) Executive has had full opportunity, prior to execution of this
Agreement, to review thoroughly this Agreement with Executive's counsel.

                  (b)      Executive further acknowledges and agrees that a
breach of any of the restrictions in Sections 6 and 7 cannot be adequately
compensated by monetary damages. Executive agrees that the Company shall be
entitled to preliminary and permanent injunctive relief, without the necessity
of proving actual damages, as well as an equitable accounting of all earnings,
profits and other benefits arising from any violation of Sections 6 or 7 hereof,
which rights shall be cumulative and in addition to any other rights or remedies
to which the Company may be entitled. In the event that any of the provisions of
Sections 6 or 7 hereof should ever be adjudicated to exceed the time,
geographic, service, or other limitations permitted by applicable law in any
jurisdiction, it is the intention of the parties that the provision shall be
amended to the extent of the maximum time, geographic, service, or other
limitations permitted by applicable law, that such amendment shall apply only
within the jurisdiction of the court that made such adjudication and that the
provision otherwise be enforced to the maximum extent permitted by law.

                  (c)      Executive irrevocably and unconditionally (i) agrees
that any suit, action or other legal proceeding arising out of Section 6 or 7
hereof, including without limitation, any action commenced by the Company for
preliminary and permanent injunctive relief and other equitable relief, may be
brought in a United States District Court in Philadelphia or Montgomery County,
Pennsylvania, or if such court does not have jurisdiction or will not accept
jurisdiction, in any court

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of general jurisdiction in Philadelphia or Montgomery Country, Pennsylvania,
(ii) consents to the non-exclusive jurisdiction of any such court in any such
suit, action or proceeding, and (iii) waives any objection which Executive may
have to the laying of venue of any such suit, action or proceeding in any such
court. Executive also irrevocably and unconditionally consents to the service of
any process, pleadings, notices or other papers in a manner permitted by the
notice provisions of Section 19 hereof.

                  (d)      For the purposes of this Section 8 the term "Company"
shall be deemed to include the Company, its subsidiaries and their successors.

9.       INDEMNIFICATION. The Company shall indemnify Executive with respect to
his or her actions in the performance of his or her duties to the Company to the
fullest extent permitted by the Company's bylaws as in effect from time to time.

10.      NO MITIGATION: NO OFFSET. In the event of any termination of
Executive's employment under the Agreement, Executive shall be under no
obligation to seek other employment, and there shall be no offset against
amounts due Executive under the Agreement on account of any remuneration
attributable to any subsequent employment that Executive may obtain.

11.      SUCCESSORS, BINDING AGREEMENT.

                  (a)      The Company will require any successor (whether
direct or indirect, by purchase, merger, consolidation or otherwise) to all or
substantially all of the business and/or assets of the Company to expressly
assume and agree to perform this Agreement in the same manner and to the same
extent that the Company would be required to perform it if no such succession
had taken place.

                  (b)      This Agreement shall inure to the benefit of and be
enforceable by Executive's personal or legal representatives, executors,
administrators, successors, heirs, distributees, devises and legatees. If
Executive should die after Executive's termination of employment under
circumstances entitling Executive to benefits hereunder and while any amount
would still be payable to Executive hereunder if Executive had continued to
live, all such amounts, unless otherwise provided herein, shall be paid in
accordance with the terms of this Agreement to the personal representative of
Executive's estate.

12.      REPRESENTATION. The Company and Executive respectively represent and
warrant to each other that, subject to any approval that may be necessary from
any pertinent regulatory authority, each respectively is fully authorized and
empowered to enter into the Agreement and that its or his or her entering into
this Agreement and the performance of its or his or her respective obligations
under the Agreement will not violate any agreement between the Company or
Executive respectively and any other person, firm or organization or any law or
governmental regulation.

13.      ENTIRE AGREEMENT; EMPLOYMENT AGREEMENT. The Agreement (along with the
Employment Agreement) contains the entire agreement between the parties
concerning the subject matter hereof

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and supersedes all prior agreements, understandings, discussions, negotiations
and undertakings, whether written or oral, between the parties with respect
thereto. If Executive receives benefits under Section 3 of this Agreement, (i)
Executive shall not receive severance benefits under the Employment Agreement,
(ii) the provisions of Sections 7 and 8 of this Agreement shall supercede the
non-competition and non-solicitation covenants of the Employment Agreement, and
(iii) the Employment Agreement shall be deemed to be amended accordingly.

14.      AMENDMENT OR WAIVER. The Agreement cannot be changed, modified or
amended without the consent in writing of both Executive and the Company. No
waiver by either party at any time of any breach by the other party of any
condition or provision of the Agreement shall be deemed a waiver of a similar or
dissimilar condition or provision at the same or at any prior or subsequent
time. Any waiver must be in writing and signed by Executive or an authorized
officer of the Company, as the case may be.

15.      SEVERABILITY. In the event that any provision or portion of the
Agreement shall be determined to be invalid or unenforceable for any reason, in
whole or in part, the remaining provisions of the Agreement shall be unaffected
thereby and shall remain in full force and effect to the fullest extent
permitted by law.

16.      SURVIVORSHIP. The respective rights and obligations of the parties
hereunder shall survive any termination of the Agreement to the extent necessary
to the intended preservation of such rights and obligations. The Agreement shall
continue in effect until all amounts required to be paid under the Agreement
have been paid, or until Executive's employment with the Company terminates
under circumstances that do not entitle Executive to benefits under Section 3.

17.      GOVERNING LAW. The Agreement shall be governed by and construed and
interpreted in accordance with the laws of the State of Delaware without
reference to principles of conflict of laws.

18.      LEGAL FEES. It is the intent of the parties that Executive not be
required to incur any expenses associated with the enforcement of his or her
rights under this Agreement by litigation or other legal action. Accordingly,
the Company agrees to pay as incurred, to the full extent permitted by law, all
expenses (including all attorney's fees and legal expenses) which Executive may
reasonably incur as a result of any contest (regardless of the outcome thereof)
by the Company, Executive or others concerning the validity or enforceability
of, or liability under, any provision of this Agreement, regardless of whether
such contest is between the Company and Executive or between either of them and
a third party, including any contest regarding the amount of the Gross-Up
Payment pursuant to this Agreement.

19.      NOTICES. Any notice given to either party shall be in writing and shall
be deemed to have been given when delivered personally or sent by certified or
registered mail, postage prepaid, return receipt requested, duly addressed to
the party concerned at the address indicated below or to such changed address as
such party may subsequently give notice of:

                  If to the Company:

                                      -12-
<PAGE>   13
                  Cell Pathways, Inc.
                  702 Electronic Drive
                  Horsham, PA  19044
                  Attention:   General Counsel

                  If to Executive:

                  Lloyd Glenn
                  1609 Claudia Way
                  North Wales, PA 19454

20.      WITHHOLDING TAXES. All payments under this Agreement shall be made
subject to applicable tax withholding, and the Company shall withhold from any
payments under this Agreement all such federal, state and local taxes as the
Company is required to withhold pursuant to any law or governmental rule or
regulation.

21.      HEADINGS. The headings of the Sections contained in the Agreement are
for convenience of reference only, do not constitute a part of this Agreement
and shall not be deemed to limit or affect any of the provisions hereof.

22.      COUNTERPARTS. The Agreement may be executed in two or more
counterparts.

         IN WITNESS WHEREOF, the undersigned have executed the Agreement as of
the date first above.

                                   Cell Pathways, Inc.

                                   By:
                                      --------------------------
                                      Robert J. Towarnicki
                                   As its: President and Chief Executive Officer

                                   ------------------------------------
                                   Lloyd Glenn

                                      -13-<PAGE>

                                                                     EXHIBIT 4.3

                   _________________________________________

                                   NNG, INC.

                                      and

                        EQUISERVE TRUST COMPANY, N. A.

                                 Rights Agent
                   _________________________________________

                               Rights Agreement
                   _________________________________________

                         Dated as of January 31, 2001
                   _________________________________________
<PAGE>

                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                                              Page
                                                                                              ----
<S>                                                                                           <C>
Section 1.     Certain Definitions..........................................................    1
Section 2.     Appointment of Rights Agent..................................................    4
Section 3.     Issuance of Right Certificates...............................................    4
Section 4.     Form of Right Certificate....................................................    6
Section 5.     Countersignature and Registration............................................    7
Section 6.     Transfer, Split-Up, Combination and Exchange of Right Certificates;
               Mutilated, Destroyed, Lost or Stolen Right Certificate.......................    7
Section 7.     Exercise of Rights; Purchase Price; Expiration Date of Rights................    8
Section 8.     Cancellation and Destruction of Right Certificates...........................   10
Section 9.     Reservations and Availability of Preferred Shares............................   10
Section 10.    Preferred Shares Record Date.................................................   11
Section 11.    Adjustment of Purchase Price, Number and Kind of Shares or Number of Rights..   12
Section 12.    Certificate of Adjusted Purchase Price or Number of Shares...................   18
Section 13.    Consolidation, Merger or Sale or Transfer of Assets or Earning Power.........   18
Section 14.    Fractional Rights and Fractional Shares......................................   21
Section 15.    Rights of Action.............................................................   22
Section 16.    Agreement of Right Holders...................................................   22
Section 17.    Right Certificate Holder Not Deemed a Stockholder............................   23
Section 18.    Concerning the Rights Agent..................................................   23
Section 19.    Merger or Consolidation or Change of Name of Rights Agent....................   24
Section 20.    Duties of Rights Agent.......................................................   24
Section 21.    Change of Rights Agent.......................................................   27
Section 22.    Issuance of New Rights Certificates..........................................   27
Section 23.    Redemption and Termination...................................................   28
Section 24.    Exchange.....................................................................   29
Section 25.    Notice of Certain Events.....................................................   30
Section 26.    Notices......................................................................   31
Section 27.    Supplements and Amendments...................................................   31
Section 28.    Determination and Actions by the Board of Directors, etc.....................   32
Section 29.    Successors...................................................................   32
Section 30.    Benefits of this Agreement...................................................   32
Section 31.    Severability.................................................................   32
Section 32.    Governing Law................................................................   32
Section 33.    Counterparts.................................................................   33
Section 34.    Descriptive Headings.........................................................   33
Signatures..................................................................................   34
</TABLE>

                                       i
<PAGE>

Exhibit A   -  Certificate of Designation, Preferences and Rights of Series A
               Junior Participating Preferred Stock of NNG, Inc.

Exhibit B   -  Form of Right Certificate

Exhibit C   -  Summary of Rights to Purchase Preferred Shares

                                       ii
<PAGE>

                      Defined Term Cross Reference Sheet
                      ----------------------------------

TERM                                                                    LOCATION
----                                                                    --------
Acquiring Person....................................................Section 1(a)
Act.................................................................Section 1(b)
Adjusted Number of Shares.....................................Section 11(a)(iii)
Adjusted Purchase Price.......................................Section 11(a)(iii)
Adjustment Shares..............................................Section 11(a)(ii)
Affiliate...........................................................Section 1(c)
Agreement................................................................Preface
Associate...........................................................Section 1(c)
Beneficial Owner....................................................Section 1(d)
Beneficially Own....................................................Section 1(d)
Business Day........................................................Section 1(e)
capital stock equivalent......................................Section 11(a)(iii)
Close of Business...................................................Section 1(f)
Common Shares.......................................................Section 1(g)
Corporation..............................................................Preface
current per share market price..................................Section 11(d)(i)
Distribution Date...................................................Section 3(a)
Documents.............................................................Section 18
equivalent preferred shares........................................Section 11(b)
Exchange Act........................................................Section 1(c)
Exchange Ratio.....................................................Section 24(a)
Final Expiration Date...............................................Section 7(a)
Interested Stockholder..............................................Section 1(j)
NASDAQ..........................................................Section 11(d)(i)
Permitted Offer.....................................................Section 1(k)
Person..............................................................Section 1(l)
Preferred Shares....................................................Section 1(m)
Principal Party....................................................Section 13(b)
Proration Factor..............................................Section 11(a)(iii)
Purchase Price......................................................Section 4(a)
Record Date..............................................................Preface
Redemption Date.....................................................Section 7(a)
Redemption Price................................................Section 23(a)(i)
Right....................................................................Preface
Right Certificate...................................................Section 3(a)
Rights Agent.............................................................Preface
Rights Agreement....................................................Section 3(c)
Section 11(a)(ii) Event.............................................Section 1(o)
Section 13 Event....................................................Section 1(p)
Security........................................................Section 11(d)(i)
Shares Acquisition Date.............................................Section 1(q)
Subsidiary..........................................................Section 1(r)
Summary of Rights...................................................Section 3(b)

                                      iii
<PAGE>

Trading Day.....................................................Section 11(d)(i)
Triggering Event....................................................Section 1(s)
voting securities..................................................Section (13)a

                                       iv
<PAGE>

                               RIGHTS AGREEMENT

     RIGHTS AGREEMENT, dated as of January 31, 2001 (the "Agreement"), between
                                                          ---------
NNG, Inc., a Delaware corporation (the "Corporation"), and EquiServe Trust
                                        -----------
Company, N. A., a national association (the "Rights Agent").
                                             ------------

     The Board of Directors of the Corporation has authorized and declared a
dividend of one preferred share purchase right (a "Right") for each Common Share
                                                   -----
(as hereinafter defined) of the Corporation outstanding at the close of business
on January 31, 2001 (the "Record Date"), each Right representing the right to
                          -----------
purchase one one-thousandth of a Preferred Share (as hereinafter defined), upon
the terms and subject to the conditions herein set forth, and has further
authorized and directed the issuance of one Right with respect to each Common
Share that shall become outstanding between the Record Date and the earliest of
the Distribution Date, the Redemption Date or the Final Expiration Date (as such
terms are hereinafter defined); provided, however, that Rights may be issued
                                -------- --------
with respect to Common Shares that shall become outstanding after the
Distribution Date and prior to the earlier of the Redemption Date and the Final
Expiration Date in accordance with the provisions of Section 22 of this
Agreement.

     Accordingly, 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 shall be
                 ----------------
the Beneficial Owner of 15% or more of the then outstanding Common Shares (other
than as a result of a Permitted Offer (as hereinafter defined)) or is such a
Beneficial Owner at any time after the date hereof, whether or not such person
continues to be the Beneficial Owner of 15% or more of the then outstanding
Common Shares.  Notwithstanding the foregoing, (A) the term "Acquiring Person"
shall not include (i) the Corporation, (ii) any Subsidiary of the Corporation,
(iii) any employee benefit plan of the Corporation or of any Subsidiary of the
Corporation, (iv) any Person or entity organized, appointed or established by
the Corporation for or pursuant to the terms of any such plan, (v) any Person
who or which becomes the Beneficial Owner of 15% or more of the then outstanding
Common Shares as a result of the acquisition of Common Shares directly from the
Corporation or (vi) Unitrin, Inc. or any of its Subsidiaries, considered
individually or together, ("Unitrin") in the circumstances set forth below, and
(B) no Person shall be deemed to be an "Acquiring Person" as a result of the
acquisition of Common Shares by the Corporation which, by reducing the number of
Common Shares outstanding, increases the proportional number of shares
beneficially owned by such Person.  Unitrin shall not be deemed an "Acquiring
Person" by reason of (A) the acquisition or ownership of Common Shares issued to
Unitrin in exchange for shares of Litton Industries, Inc. capital stock pursuant
to the Corporation's offer to purchase or exchange all of the outstanding
capital stock of Litton Industries, Inc. for cash or capital stock of the
Corporation; (B) the acquisition or ownership of Common Shares issued to Unitrin
pursuant to the terms and provisions of the Series B Preferred Stock of the
Corporation, provided that such Series B Preferred Stock was acquired by Unitrin
pursuant to the foregoing offer to purchase or exchange; (C) the acquisition or
ownership of
<PAGE>

Common Shares issued to Unitrin pursuant to any stock dividend, stock split or
other distribution made ratably to stockholders of the Corporation; (D) the
repurchase by the Corporation of its capital stock, by tender offer or
otherwise; or (E) any other action on the part of the Corporation. Any Person
who is not an "Acquiring Person" by reason of clause (A)(vi) or (B) of the
second sentence of this definition, or by reason of the preceding sentence,
shall become an "Acquiring Person" if such Person shall thereafter acquire
Beneficial ownership of a number of Voting Shares of the Company equal to 1% or
more of the Voting Shares of the Company then outstanding (other than pursuant
to any stock dividend, stock split or other distribution made ratably to
stockholders of the Corporation) and such Person shall Beneficially Own 15% or
more of then outstanding Common Shares. In addition, no Person shall be deemed
an "Acquiring Person" solely by reason of paragraph (iii) of the definition of
"Beneficial Owner" or if such Person has become such through inadvertence, if
and for so long as the Board of Directors shall have determined, by resolution,
that such Person has acted promptly to reduce its Beneficial Ownership of Common
Shares to less than 15% of the then outstanding Common Shares or if such Person
has entered into such other arrangements as the Board of Directors shall
determine to be adequate and satisfactory to protect the interests of the
Company and its stockholders.

          (b)  "Act" shall mean the Securities Act of 1933, as amended and as
                ---
in effect on the date of this Agreement.

          (c)  "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 and in effect on the date of
this Agreement (the "Exchange Act").
                      ------------

          (d)  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 beneficially owns, directly or indirectly;

               (ii)   which such Person or any of such Person's Affiliates or
Associates has (A) the right to acquire (whether such right is exercisable
immediately or only after the passage of time) pursuant to any agreement,
arrangement or understanding, or upon the exercise of conversion rights,
exchange rights, rights (other than the Rights), warrants or options, or
otherwise; provided, however, that a Person shall not be deemed the Beneficial
           --------  -------
Owner of, or to Beneficially Own, securities tendered pursuant to a tender or
exchange offer made by or on behalf of such Person or any of such Person's
Affiliates or Associates until such tendered securities are accepted for
purchase or exchange; or (B) the right to vote pursuant to any agreement,
arrangement or understanding; provided, however, that a Person shall not be
                              --------  -------
deemed the Beneficial Owner of, or to Beneficially Own, any security if the
agreement, arrangement or understanding to vote such security (1) arises solely
from a revocable proxy or consent given to such Person in response to a public
proxy or consent solicitation made pursuant to, and in accordance with, the
applicable rules and regulations promulgated under the Exchange Act and (2) is
not also then reportable on Schedule 13D under the Exchange Act (or any
comparable or successor report); or

                                       2
<PAGE>

               (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 (other than customary agreements with and between
underwriters and selling group members with respect to a bona fide public
offering of securities) relating to the acquisition, holding, voting (except to
the extent contemplated by the proviso to Section l(d)(ii)(B)) or disposing of
any securities of the Corporation.

          Notwithstanding anything in this definition of Beneficial Ownership to
the contrary, the phrase "then outstanding," when used with reference to a
Person's Beneficial Ownership of securities of the Corporation, shall mean the
number of such securities then issued and outstanding together with the number
of such securities not then actually issued and outstanding which such Person
would be deemed to own beneficially hereunder.

          (e)  "Business Day" shall mean any day other than a Saturday, Sunday
                ------------
or U.S. federal holiday.

          (f)  "Close of Business" on any given date shall mean 5:00 P.M., New
                -----------------
York time, on such date; provided, however, that if such date is not a Business
                         --------  -------
Day it shall mean 5:00 P.M., New York time, on the next succeeding Business Day.

          (g)  "Common Shares" when used with reference to the Corporation
                -------------
shall mean the shares of Common Stock, par value $1.00 per share, of the
Corporation or, in the event of a subdivision, combination or consolidation with
respect to such shares of Common Stock, the shares of Common Stock resulting
from such subdivision, combination or consolidation. "Common Shares" when used
with reference to any Person other than the Corporation shall mean the capital
stock (or equity interest) with the greatest voting power of such other Person
or, if such other Person is a Subsidiary of another Person, the Person or
Persons which ultimately control such first-mentioned Person.

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

          (i)  "Final Expiration Date" shall have the meaning set forth in
                ---------------------
Section 7 hereof.

          (j)  "Interested Stockholder" shall mean any Acquiring Person or any
                ----------------------
Affiliate or Associate of an Acquiring Person or any other Person in which any
such Acquiring Person, Affiliate or Associate has an interest, or any other
Person acting directly or indirectly on behalf of or in concert with any such
Acquiring Person, Affiliate or Associate.

          (k)  "Permitted Offer" shall mean a tender or exchange offer which is
                ---------------
for all outstanding Common Shares at a price and on terms determined, prior to
the purchase of shares under such tender or exchange offer, by at least a
majority of the members of the Board of Directors who are not officers of the
Corporation and who are not Acquiring Persons or Persons who would become
Acquiring Persons as a result of the offer in question or Affiliates,
Associates, nominees or representatives of any such Person, to be adequate
(taking into account all factors that such Directors deem relevant including,
without limitation, prices that could reasonably be achieved if the Corporation
or its assets were sold on an orderly basis designed to

                                       3
<PAGE>

realize maximum value) and otherwise in the best interests of the Corporation
and its stockholders (other than the Person or any Affiliate or Associate
thereof on whose behalf the offer is being made) taking into account all factors
that such directors may deem relevant.

          (l)  "Person" shall mean any individual, firm, partnership,
                ------
corporation, limited liability company, trust, association, joint venture or
other entity, and shall include any successor (by merger or otherwise) of such
entity.

          (m)  "Preferred Shares" shall mean shares of Series A Junior
                ----------------
Participating Preferred Stock, par value $1.00 per share, of the Corporation
having the relative rights, preferences and limitations set forth in the
Certificate of Designation, Preferences and Rights attached to this Agreement as
Exhibit A.

          (n)  "Redemption Date" shall have the meaning set forth in Section 7
                ---------------
hereof.

          (o)  "Section 11(a)(ii) Event" shall mean any event described in
                -----------------------
Section 11(a)(ii) hereof.

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

          (q)  "Shares Acquisition Date" shall mean the first date of public
                -----------------------
announcement (which, for purposes of this definition, shall include, without
limitation, a report filed pursuant to the Exchange Act) by the Corporation or
an Acquiring Person that an Acquiring Person has become such; provided, however,
                                                              --------  -------
that, if such Person is determined not to have become an Acquiring Person
pursuant to Section 1(a) hereof, then no Shares Acquisition Date shall be deemed
to have occurred.

          (r)  "Subsidiary" of any Person shall mean any corporation or other
                ----------
Person of which a majority of the voting power of the voting equity securities
or equity interest is owned, directly or indirectly, by such Person.

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

     Section 2.  Appointment of Rights Agent.  The Corporation hereby appoints
                 ---------------------------
the Rights Agent to act as agent for the Corporation in accordance with the
terms and conditions hereof, and the Rights Agent hereby accepts such
appointment.  The Corporation may from time to time appoint such co-Rights
Agents as it may deem necessary or desirable, upon 10 days prior written notice
to the Rights Agent.  The Rights Agent shall have no duty to supervise, and
shall not be liable for, the acts or omissions of any such co-Rights Agent.

     Section 3.  Issuance of Right Certificates.
                 ------------------------------

          (a)  Until the earlier of (i) the Shares Acquisition Date or (ii) the
Close of Business on the tenth day (or such later date as may be determined by
action of the Corporation's Board of Directors) after the date of the
commencement by any Person (other than the Corporation, any Subsidiary of the
Corporation, any employee benefit plan of the Corporation or

                                       4
<PAGE>

of any Subsidiary of the Corporation or any Person or entity organized,
appointed or established by the Corporation for or pursuant to the terms of any
such plan) of, or of the first public announcement of the intention of any
Person (other than the Corporation, any Subsidiary of the Corporation, any
employee benefit plan of the Corporation or of any Subsidiary of the Corporation
or any Person or entity organized, appointed or established by the Corporation
for or pursuant to the terms of any such plan) to commence (which intention to
commence remains in effect for five Business Days after such announcement), a
tender or exchange offer the consummation of which would result in any Person
becoming an Acquiring Person (including, in the case of both (i) and (ii), any
such date which is after the date of this Agreement and prior to the issuance of
the Rights), the earlier of such dates being herein referred to as the
"Distribution Date," (x) the Rights will be evidenced (subject to the provisions
 -----------------
of Section 3(b) hereof) by the certificates for Common Shares registered in the
names of the holders thereof (which certificates shall also be deemed to be
Right Certificates) and not by separate Right Certificates, and (y) the right to
receive Right Certificates will be transferable only in connection with the
transfer of the underlying Common Shares (including a transfer to the
Corporation); provided, however, that if a tender or exchange offer is
              --------  -------
terminated prior to the occurrence of a Distribution Date, then no Distribution
Date shall occur as a result of such tender offer. As soon as practicable after
the Distribution Date, the Corporation will prepare and execute, the Rights
Agent will countersign, and the Corporation will send or cause to be sent by
first-class, postage-prepaid mail, to each record holder of Common Shares as of
the close of business on the Distribution Date, at the address of such holder
shown on the records of the Corporation, a Right Certificate, substantially in
the form of Exhibit B hereto (a "Right Certificate"), evidencing one Right for
                                 -----------------
each Common Share so held.  As of and after the Distribution Date, the Rights
will be evidenced solely by such Right Certificates.

          (b)  As promptly as practicable following the Record Date, the
Corporation will send a copy of a Summary of Rights to Purchase Preferred
Shares, in substantially the form of Exhibit C hereto (the "Summary of
                                                            ----------
Rights"), by first-class, postage-prepaid mail, to each record holder of Common
------
Shares as of the Close of Business on the Record Date, at the address of such
holder shown on the records of the Corporation.  With respect to certificates
for Common Shares outstanding as of the Record Date, until the Distribution
Date, the Rights will be evidenced by such certificates registered in the names
of the holders thereof together with a copy of the Summary of Rights attached
thereto.  Until the Distribution Date (or the earlier of the Redemption Date or
the Final Expiration Date), the surrender for transfer of any certificate for
Common Shares outstanding on the Record Date, with or without a copy of the
Summary of Rights attached thereto, shall also constitute the transfer of the
Rights associated with such Common Shares.  As a result of the execution of this
Agreement on January 31, 2001, each share of Common Stock outstanding as of
January 31, 2001 shall, subject to the terms and conditions of this Agreement,
also represent one Right and shall, subject to the terms and conditions of this
Agreement, represent the right to purchase one one-thousandth of a share of
Preferred Stock.

          (c)  Certificates for Common Shares which become outstanding
(including, without limitation, reacquired Common Shares referred to in the last
sentence of this paragraph (c)) after the Record Date but prior to the earliest
of the Distribution Date, the Redemption Date or the Final Expiration Date,
shall be deemed also to be certificates for Rights, and shall bear the following
legend:

                                       5
<PAGE>

     This certificate also evidences and entitles the holder hereof to certain
     rights as set forth in a Rights Agreement between NNG, Inc. and EquiServe
     Trust Company, N. A., dated as of January 31, 2001 (the "Rights
                                                              ------
     Agreement"), the terms of which are hereby incorporated herein by reference
     and a copy of which is on file at the principal executive offices of NNG,
     Inc.  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.  NNG, Inc. will mail to the holder of
     this certificate a copy of the Rights Agreement without charge 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 or an Affiliate or Associate thereof
     (as defined in the Rights Agreement) and certain related persons, 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
Distribution Date, the Rights associated with the Common Shares represented by
such certificates shall be evidenced by such certificates alone, and the
surrender for transfer of any such certificate shall also constitute the
transfer of the Rights associated with the Common Shares represented thereby.
In the event that the Corporation purchases or acquires any Common Shares after
the Record Date but prior to the Distribution Date, any Rights associated with
such Common Shares shall be deemed cancelled and retired so that the Corporation
shall not be entitled to exercise any Rights associated with the Common Shares
which are no longer outstanding.

     Section 4.  Form of Right Certificate.
                 -------------------------

          (a)  The Right Certificates (and the forms of election to purchase and
of assignment to be printed on the reverse thereof) shall be substantially in
the form set forth in Exhibit B hereto and may have such marks of identification
or designation and such legends, summaries or endorsements printed thereon as
the Corporation may deem appropriate (which do not affect the duties or
responsibilities of the Rights Agent) 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 Right Certificates shall entitle the holders thereof
to purchase such number of one one-thousandths of a Preferred Share as shall be
set forth therein at the price per one one-thousandth of a Preferred Share set
forth therein (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 Right Certificate issued pursuant to Section 3(a) or Section
22 hereof that represents Rights which are null and void pursuant to Section
7(e) of this Agreement and any Right Certificate issued pursuant to Section 6 or
Section 11(i) hereof upon transfer, exchange, replacement or adjustment of any
other Right Certificate referred to in this sentence, shall contain (to the
extent feasible) the following legend:

     The Rights represented by this Right Certificate are or were Beneficially
     Owned by a Person who was or became an Acquiring Person or an Affiliate or
     Associate

                                       6
<PAGE>

     of an Acquiring Person (as such terms are defined in the Rights Agreement).
     Accordingly, this Right Certificate and the Rights represented hereby are
     null and void.

The provisions of Section 7(e) of this Rights Agreement shall be operative
whether or not the foregoing legend is contained on any such Right Certificate.
The Corporation shall notify the Rights Agent to the extent that this Section
4(b) applies.

     Section 5.  Countersignature and Registration.  The Right Certificates
                 ---------------------------------
shall be executed on behalf of the Corporation by its Chairman of the Board, its
Chief Executive Officer, its President, any of its Vice Presidents, or its
Treasurer, either manually or by facsimile signature, shall have affixed thereto
the Corporation's seal or a facsimile thereof, and shall be attested by the
Secretary or an Assistant Secretary of the Corporation, either manually or by
facsimile signature.  The Right Certificates shall be countersigned by the
Rights Agent and shall not be valid for any purpose unless so countersigned.  In
case any officer of the Corporation who shall have signed any of the Right
Certificates shall cease to be such officer of the Corporation before
countersignature by the Rights Agent and issuance and delivery by the
Corporation, such Right Certificates may nevertheless be countersigned by the
Rights Agent and issued and delivered by the Corporation with the same force and
effect as though the person who signed such Right Certificates had not ceased to
be such officer of the Corporation; and any Right Certificate may be signed on
behalf of the Corporation by any Person who, at the actual date of the execution
of such Right Certificate, shall be a proper officer of the Corporation to sign
such Right Certificate, although at the date of the execution of this Rights
Agreement any such Person was not such an officer.

     Following the Distribution Date and receipt by the Rights Agent of a list
of record holders of Rights, the Rights Agent will keep or cause to be kept, at
its office designated pursuant to Section 26 hereof or offices designated as the
appropriate place for surrender of such Right Certificate or transfer, books for
registration and transfer of the Right Certificates issued hereunder.  Such
books shall show the names and addresses of the respective holders of the Right
Certificates, the number of Rights evidenced on its face by each of the Right
Certificates and the certificate number and the date of each of the Right
Certificates.

     Section 6.  Transfer, Split-Up, Combination and Exchange of Right
                 -----------------------------------------------------
Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificate.  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 earlier of the Redemption Date or the Final
Expiration Date, any Right Certificate or Right Certificates may be transferred,
split up, combined or exchanged for another Right Certificate or Right
Certificates, entitling the registered holder to purchase a like number of one
one-thousandths of a Preferred Share (or, following a Triggering Event, other
securities, as the case may be) as the Right Certificate or Right 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 Right Certificate or Right Certificates shall make such
request in writing delivered to the Rights Agent, and shall surrender the Right
Certificate or Right Certificates to be transferred, split up, combined or
exchanged at the office or offices of the Rights Agent designated for such
purpose.  Neither the Rights Agent nor the Corporation shall be obligated to
take any action

                                       7
<PAGE>

whatsoever with respect to the transfer of any such surrendered Right
Certificate until the registered holder shall have completed and signed the
certificate contained in the form of assignment on the reverse side of such
Right 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 Corporation or the Rights Agent 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
Right Certificate or Right Certificates, as the case may be, as so requested.
The Corporation may require payment of a sum sufficient to cover any tax or
governmental charge that may be imposed in connection with any transfer, split
up, combination or exchange of Right Certificates. If the Corporation requires
the payment referred to in the immediately preceding sentence, then the Rights
Agent shall not be required to process any transaction until it receives notice
from the Corporation that the Corporation has received such payment.

     Upon receipt by the Corporation and the Rights Agent of evidence
satisfactory to them of the loss, theft, destruction or mutilation of a Right
Certificate, and, in case of loss, theft or destruction, of indemnity or
security reasonably satisfactory to them, and, at the Corporation's request,
reimbursement to the Corporation and the Rights Agent of all reasonable expenses
incidental thereto, and upon surrender to the Rights Agent and cancellation of
the Right Certificate if mutilated, the Corporation will make and deliver a new
Right Certificate of like tenor to the Rights Agent for countersignature and
delivery to the registered holder in lieu of the Right 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
Right Certificate may exercise the Rights evidenced thereby (except as otherwise
provided herein) in whole or in part at any time after the Distribution Date
upon surrender of the Right 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 or offices of the Rights Agent designated for such purpose,
together with payment of the aggregate Purchase Price for the total number of
one one-thousandths of a Preferred Share (or other securities, as the case may
be) as to which such surrendered Rights are exercised, at or prior to the
earliest of (i) the Close of Business on October 31, 2008 (the "Final
                                                                -----
Expiration Date"), (ii) the time at which the Rights are redeemed as provided in
---------------
Section 23 hereof (the "Redemption Date"); (iii) the time at which the Rights
                        ---------------
are exchanged as provided in Section 24 hereof, or (iv) the consummation of a
transaction contemplated by Section 13(d) hereof.

          (b)  The Purchase Price for each one one-thousandth of a Preferred
Share pursuant to the exercise of a Right shall initially be $250.00, shall be
subject to adjustment from time to time as provided in the next sentence and in
Sections 11 and 13(a) hereof and shall be payable in accordance with paragraph
(c) below.  Anything in this Agreement to the contrary notwithstanding, in the
event that at any time after the date of this Agreement and prior to the
Distribution Date, the Corporation shall (i) declare or pay any dividend on the
Common Shares payable in Common Shares or (ii) effect a subdivision, combination
or consolidation of the Common Shares (by reclassification or otherwise than by
payment of dividends in Common Shares) into a greater or lesser number of Common
Shares, then in any such case, each Common

                                       8
<PAGE>

Share outstanding following such subdivision, combination or consolidation shall
continue to have one Right associated therewith and the Purchase Price following
any such event shall be proportionately adjusted to equal the result obtained by
multiplying the Purchase Price immediately prior to such event by a fraction,
the numerator of which shall be the total number of Common Shares outstanding
immediately prior to the occurrence of the event and the denominator of which
shall be the total number of Common Shares outstanding immediately following the
occurrence of such event. The adjustment provided for in the preceding sentence
shall be made successively whenever such a dividend is declared or paid or such
a subdivision, combination or consolidation is effected.

          (c)  Upon receipt of a Right Certificate representing exercisable
Rights, with the form of election to purchase and the certificate duly executed,
accompanied by payment of the Purchase Price for the Preferred Shares (or other
securities, as the case may be) to be purchased and an amount equal to any
applicable tax or governmental charge required to be paid by the holder of such
Right Certificate in accordance with Section 6 hereof by certified check,
cashier's check or money order payable to the order of the Corporation, the
Rights Agent shall thereupon promptly (i) (A) requisition from any transfer
agent of the Preferred Shares certificates for the number of Preferred Shares to
be purchased and the Corporation hereby irrevocably authorizes its transfer
agent to comply with all such requests, or (B) if the Corporation, in its sole
discretion, shall have elected to deposit the Preferred Shares issuable upon
exercise of the Rights hereunder into a depositary, requisition from the
depositary agent depositary receipts representing such number of one one-
thousandths of a Preferred Share as are to be purchased (in which case
certificates for the Preferred Shares represented by such receipts shall be
deposited by the transfer agent with the depositary agent) and the Corporation
will direct the depositary agent to comply with such requests, (ii) when
appropriate, requisition from the Corporation the amount of cash to be paid in
lieu of issuance 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 Right
Certificate, registered in such name or names as may be designated by such
holder, and (iv) when appropriate, after receipt thereof, deliver such cash to
or upon the order of the registered holder of such Right Certificate.  In the
event that the Corporation is obligated to issue other securities (including
Common Shares) of the Corporation pursuant to Section 11(a) hereof, the
Corporation will make all arrangements necessary so that such other securities
are available for distribution by the Rights Agent, if and when necessary to
comply with this Agreement.

          In addition, in the case of an exercise of the Rights by a holder
pursuant to Section 11(a)(ii), the Rights Agent shall return such Right
Certificate to the registered holder thereof after imprinting, stamping or
otherwise indicating thereon that the rights represented by such Right
Certificate no longer include the rights provided by Section 11(a)(ii) of the
Rights Agreement and if less than all the Rights represented by such Right
Certificate were so exercised, the Rights Agent shall indicate on the Right
Certificate the number of Rights represented thereby which continue to include
the rights provided by Section 11(a)(ii).

          (d)  In case the registered holder of any Right Certificate shall
exercise less than all the Rights evidenced thereby, a new Right Certificate
evidencing Rights equivalent to the Rights remaining unexercised shall be issued
by the Rights Agent to the registered holder of such Right Certificate or to his
duly authorized assigns, subject to the provisions of Section 6 and

                                       9
<PAGE>

Section 14 hereof, or the Rights Agent shall place an appropriate notation on
the Right Certificate with respect to those Rights exercised.

          (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 or an Affiliate or Associate of an
Acquiring Person, (ii) a transferee of an Acquiring Person (or of any Affiliate
or Associate thereof) who becomes a transferee after the Acquiring Person
becomes such, or (iii) a transferee of an Acquiring Person (or of any Affiliate
or Associate thereof) who becomes a transferee prior to or concurrently with the
Acquiring Person becoming such and receives such Rights pursuant to either (A) a
transfer (whether or not for consideration) from the Acquiring Person to holders
of equity interests in such Acquiring Person or to any Person with whom the
Acquiring Person has a continuing agreement, arrangement or understanding
regarding the transferred Rights or (B) a transfer which the Board of Directors
of the Corporation has determined is part of an agreement, 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
Corporation shall notify the Rights Agent when this Section 7(e) applies and
shall use all reasonable efforts to insure that the provisions of this Section
7(e) and Section 4(b) hereof are complied with, but neither the Company nor the
Rights Agent shall have any liability to any holder of Right Certificates or
other Person as a result of the Corporation's failure to make any determinations
with respect to an Acquiring Person or its Affiliates, Associates or transferees
hereunder.

          (f)  Notwithstanding anything in this Agreement to the contrary,
neither the Rights Agent nor the Corporation 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) properly completed and signed the certificate contained in the form of
election to purchase set forth on the reverse side of the Right 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 Corporation or the Rights Agent shall reasonably
request.

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

     Section 9.  Reservation and Availability of Preferred Shares.  The
                 ------------------------------------------------
Corporation covenants and agrees that at all times prior to the occurrence of a
Section 11(a)(ii) Event it will cause to be

                                       10
<PAGE>

reserved and kept available out of its authorized and unissued Preferred Shares,
or any authorized and issued Preferred Shares held in its treasury, the number
of Preferred Shares that will be sufficient to permit the exercise in full of
all outstanding Rights and, after the occurrence of a Section 11(a)(ii) Event,
shall, to the extent reasonably practicable, so reserve and keep available a
sufficient number of Common Shares (and/or other securities) which may be
required to permit the exercise in full of the Rights pursuant to this
Agreement.

     So long as the Preferred Shares (and, after the occurrence of a Section
11(a)(ii) Event, Common Shares or any other securities) issuable upon the
exercise of the Rights may be listed on any national securities exchange, the
Corporation 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.

     The Corporation covenants and agrees that it will take all such action as
may be necessary to ensure that all Preferred Shares (or Common Shares and/or
other securities, as the case may be) delivered upon exercise of Rights shall,
at the time of delivery of the certificates for such shares or other securities
(subject to payment of the Purchase Price), be duly and validly authorized and
issued and fully paid and non-assessable shares or securities.

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

     The Corporation shall use its best efforts to (i) file, as soon as
practicable following the Shares Acquisition Date, 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 and the rules and regulations thereunder)
until the date of the expiration of the rights provided by Section 11(a)(ii).
The Corporation will also take such action as may be appropriate under the blue
sky laws of the various states.

     Section 10.  Preferred Shares Record Date.  Each Person in whose name any
                  ----------------------------
certificate for Preferred Shares (or Common Shares 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 the Preferred Shares (or Common
Shares and/or other securities, as the case may be)

                                       11
<PAGE>

represented thereby on, and such certificate shall be dated, the date upon which
the Right Certificate evidencing such Rights was duly surrendered and payment of
the Purchase Price (and any applicable taxes and governmental charges) was made;
provided, however, that, if the date of such surrender and payment is a date
--------  -------
upon which the Preferred Shares (or Common Shares and/or other securities, as
the case may be) transfer books of the Corporation are closed, such person shall
be deemed to have become the record holder of such shares on, and such
certificate shall be dated, the next succeeding Business Day on which the
Preferred Shares (or Common Shares and/or other securities, as the case may be)
transfer books of the Corporation are open.

     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 Corporation shall at any time after the
date of this Agreement (A) declare a dividend on the Preferred Shares payable in
Preferred Shares, (B) subdivide the outstanding Preferred Shares, (C) combine
the outstanding Preferred Shares into a smaller number of Preferred Shares or
(D) issue any shares of its capital stock in a reclassification of the Preferred
Shares (including any such reclassification in connection with a consolidation
or merger in which the Corporation 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 capital stock issuable on such date, shall be
proportionately adjusted so that the holder of any Right exercised after such
time shall be entitled to receive the aggregate number and kind of shares of
capital stock which, if such Right had been exercised immediately prior to such
date and at a time when the Preferred Shares transfer books of the Corporation
were open, such holder would have owned upon such exercise and been entitled to
receive by virtue of such dividend, subdivision, combination or
reclassification; provided, however, that in no event shall the consideration to
                  --------  -------
be paid upon the exercise of one Right be less than the aggregate par value of
the shares of capital stock of the Corporation issuable upon exercise of one
Right.  If an event occurs which would require an adjustment under both Section
11(a)(i) and Section 11(a)(ii), 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).

          (ii) In the event any Person, alone or together with its Affiliates
and Associates, shall become an Acquiring Person, then proper provision shall be
made so that each holder of a Right (except as provided below and in Section
7(e) hereof) shall, for a period of 60 days after the later of the occurrence of
any such event or the effective date of an appropriate registration statement
under the Act pursuant to Section 9 hereof, have a right to receive, upon
exercise thereof at a price equal to the then current Purchase Price, in
accordance with the terms of this Agreement, such number of Common Shares (or,
in the discretion of the Board of Directors, one one-thousandths of a Preferred
Share) as shall equal the result obtained by (x) multiplying the then current
Purchase Price by the then number of one one-thousandths of a Preferred Share
for which a Right was exercisable immediately prior to the first occurrence of a
Section 11(a)(ii) Event, and dividing that product by (y) 50% of the then
current per share market price of the Corporation's Common Shares (determined
pursuant to Section 11(d) hereof)

                                       12
<PAGE>

on the date of such first occurrence (such number of shares being referred to as
the "Adjustment Shares"); provided, however, that if the transaction that would
     -----------------    --------  -------
otherwise give rise to the foregoing adjustment is also subject to the
provisions of Section 13 hereof, then only the provisions of Section 13 hereof
shall apply and no adjustment shall be made pursuant to this Section 11(a)(ii);

          (iii)  In the event that there shall not be sufficient treasury shares
or authorized but unissued (and unreserved) Common Shares to permit the exercise
in full of the Rights in accordance with the foregoing subparagraph (ii) and the
Rights become so exercisable (and the Board has determined to make the Rights
exercisable into fractions of a Preferred Share), notwithstanding any other
provision of this Agreement, to the extent necessary and permitted by applicable
law, each Right shall thereafter represent the right to receive, upon exercise
thereof at the then current Purchase Price in accordance with the terms of this
Agreement, (x) a number of (or fractions of) Common Shares (up to the maximum
number of Common Shares which may permissibly be issued) and (y) one-one
thousandth of a Preferred Share or a number of, or fractions of other equity
securities of the Corporation (or, in the discretion of the Board of Directors,
debt) which the Board of Directors of the Corporation has determined to have the
same aggregate current market value (determined pursuant to Section 11(d)(i) and
(ii) hereof, to the extent applicable,) as one Common Share (such number of, or
fractions of, Preferred Shares, debt, or other equity securities or debt of the
Corporation) being referred to as a "capital stock equivalent", equal in the
                                     ------------------------
aggregate to the number of Adjustment Shares; provided, however, if sufficient
                                              --------  -------
Common Shares and/or capital stock equivalents are unavailable, then the
Corporation shall, to the extent permitted by applicable law, take all such
action as may be necessary to authorize additional Common Shares or capital
stock equivalents for issuance upon exercise of the Rights, including the
calling of a meeting of stockholders; and provided, further, that if the
                                          --------  -------
Corporation is unable to cause sufficient Common Shares and/or capital stock
equivalents to be available for issuance upon exercise in full of the Rights,
then each Right shall thereafter represent the right to receive the Adjusted
Number of Shares upon exercise at the Adjusted Purchase Price (as such terms are
hereinafter defined).  As used herein, the term "Adjusted Number of Shares"
                                                 -------------------------
shall be equal to that number of (or fractions of) Common Shares (and/or capital
stock equivalents) equal to the product of (x) the number of Adjustment Shares
and (y) a fraction, the numerator of which is the number of Common Shares
(and/or capital stock equivalents) available for issuance upon exercise of the
Rights and the denominator of which is the aggregate number of Adjustment Shares
otherwise issuable upon exercise in full of all Rights (assuming there were a
sufficient number of Common Shares available) (such fraction being referred to
as the "Proration Factor").  The "Adjusted Purchase Price" shall mean the
        ----------------          -----------------------
product of the Purchase Price and the Proration Factor.  The Board of Directors
may, but shall not be required to, establish procedures to allocate the right to
receive Common Shares and capital stock equivalents upon exercise of the Rights
among holders of Rights.

          (b)  In case the Corporation shall fix a record date for the issuance
of rights (other than the Rights), options or warrants to all holders of
Preferred Shares entitling them (for a period expiring within 45 calendar days
after such record date) to subscribe for or purchase Preferred Shares (or shares
having the same rights, privileges and preferences as the Preferred Shares
("equivalent preferred shares")) or securities convertible into Preferred Shares
  ---------------------------
or equivalent preferred shares at a price per Preferred Share or equivalent
preferred share (or having

                                       13
<PAGE>

a conversion price per share, if a security convertible into Preferred Shares or
equivalent preferred shares) less than the then current per share market price
of the Preferred Shares (as determined pursuant to Section 11(d) hereof) 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
Preferred Shares outstanding on such record date plus the number of Preferred
Shares which the aggregate offering price of the total number of Preferred
Shares and/or equivalent preferred shares so to be offered (and/or the aggregate
initial conversion price of the convertible securities so to be offered) would
purchase at such current per share market price, and the denominator of which
shall be the number of Preferred Shares outstanding on such record date plus the
number of additional Preferred Shares and/or equivalent preferred shares to be
offered for subscription or purchase (or into which the convertible securities
so to be offered are initially convertible); provided, however, that in no event
                                             --------  -------
shall the consideration to be paid upon the exercise of one Right be less than
the aggregate par value of the shares of capital stock of the Corporation
issuable upon exercise of one Right. In case such subscription price may be paid
in a consideration part or all of which shall be in a form other than cash, the
value of such consideration shall be determined in good faith by the Board of
Directors of the Corporation, 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. Preferred Shares owned by or held for the account
of the Corporation 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, options 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 Corporation shall fix a record date for the making of
a distribution to all holders of the Preferred Shares (including any such
distribution made in connection with a consolidation or merger in which the
Corporation is the continuing or surviving corporation) of evidences of
indebtedness or assets (other than a regular quarterly cash dividend or a
dividend payable in Preferred Shares) 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 then current per share market price (as
determined pursuant to Section 11(d) hereof) of the Preferred Shares on such
record date, less the fair market value (as determined in good faith by the
Board of Directors of the Corporation, 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) of the portion of the assets or evidences of
indebtedness so to be distributed or of such subscription rights or warrants
applicable to one Preferred Share and the denominator of which shall be such
current per share market price of the Preferred Shares; provided, however, that
                                                        --------  -------
in no event shall the consideration to be paid upon the exercise of one Right be
less than the aggregate par value of the shares of capital stock of the
Corporation to be issued upon exercise of one Right.  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 again be adjusted to
be the Purchase Price which would then be in effect if such record date had not
been fixed.

                                       14
<PAGE>

          (d)  (i)  For the purpose of any computation hereunder, the "current
                                                                       -------
per share market price" of any security (a "Security" for the purpose of this
----------------------                      --------
Section 11(d)(i)) on any date shall be deemed to be the average of the daily
closing prices per share of such Security for the 30 consecutive Trading Days
(as such term is hereinafter defined) immediately prior to and not including
such date; provided, however, that in the event that the current per share
           --------  -------
market price of the Security is determined during a period following the
announcement by the issuer of such Security of (A) a dividend or distribution on
such Security payable in shares of such Security or securities convertible into
such shares, or (B) any subdivision, combination or reclassification of such
Security and prior to the expiration of 30 Trading Days after and not including
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 per share market price shall be appropriately adjusted to reflect
the current market price per share equivalent of such Security.  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 principal consolidated
transaction reporting system with respect to securities listed or admitted to
trading on the New York Stock Exchange or, if the Security is 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 securities exchange on which the Security is listed or admitted to
trading or, if the Security is 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 Quotations System
("NASDAQ") or such other system then in use, or, if on any such date the
  ------
Security is 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 Security selected by the Board of Directors of the Corporation.  If on any
such date no such market maker is making a market in the Security, the fair
value of the Security on such date as determined in good faith by the Board of
Directors of the Corporation shall be used.  The term "Trading Day" shall mean
                                                       -----------
a day on which the principal national securities exchange on which the Security
is listed or admitted to trading is open for the transaction of business or, if
the Security is not listed or admitted to trading on any national securities
exchange, a Business Day.

               (ii)   For the purpose of any computation hereunder, the "current
per share market price" of the Preferred Shares shall be determined in
accordance with the method set forth in Section 11(d)(i). If the Preferred
Shares are not publicly traded, the "current per share market price" of the
Preferred Shares shall be conclusively deemed to be the current per share market
price of the Common Shares as determined pursuant to Section 11(d)(i)
(appropriately adjusted to reflect any stock split, stock dividend or similar
transaction occurring after the date hereof), multiplied by 1,000. If neither
the Common Shares nor the Preferred Shares are publicly held or so listed or
traded, "current per share market price" shall mean the fair value per share as
determined in good faith by the Board of Directors of the Corporation, 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.

          (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 1% in the Purchase Price; provided, however,
                                                           --------  -------
that any adjustments which by reason of

                                       15
<PAGE>

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 one
one-thousandth of a Preferred Share or one ten-thousandth of any other share or
security, 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 years from the date of the transaction which mandates
such adjustment or (ii) the Final 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 of the Corporation other
than Preferred Shares, thereafter the number of other shares so receivable upon
exercise of any Right 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 Shares contained in Section 11(a) through (c),
inclusive, and the provisions of Sections 7, 9, 10, 13 and 14 with respect to
the Preferred Shares shall apply on like terms to any such other shares.

          (g) All Rights originally issued by the Corporation 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-thousandths of a
Preferred Share 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 so provided
in Section 11(i) hereof, upon adjustment of the Purchase Price as a result of
the calculations made in Sections 11(b) and 11(c) hereof, 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-
thousandths of a Preferred Share (calculated to the nearest one one-thousandth
of a Preferred Share) obtained by (i) multiplying (A) the number of Preferred
Shares covered by a Right immediately prior to this adjustment of the Purchase
Price by (B) 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 Corporation 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-thousandths of a Preferred Share purchasable upon the
exercise of a Right.  Each of the Rights outstanding after such adjustment of
the number of Rights shall be exercisable for the number of one one-thousandths
of a Preferred Share 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 ten-
thousandth) 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 Corporation 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, a copy of which public announcement shall promptly be
delivered to the Rights Agent.  This record date may be the date on which the
Purchase Price is adjusted or any

                                       16
<PAGE>

day thereafter, but, if the Right Certificates have been issued, shall be at
least 10 days later than the date of the public announcement. If Right
Certificates have been issued, upon each adjustment of the number of Rights
pursuant to this Section 11(i), the Corporation shall, as promptly as
practicable, cause to be distributed to holders of record of Right Certificates
on such record date Right 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 Corporation, shall cause to be
distributed to such holders of record in substitution and replacement for the
Right Certificates held by such holders prior to the date of adjustment, and
upon surrender thereof, if required by the Corporation, new Right Certificates
evidencing all the Rights to which such holders shall be entitled after such
adjustment. Right Certificates so to be distributed shall be issued, executed
and countersigned in the manner provided for herein and shall be registered in
the names of the holders of record of Right 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-thousandths of a Preferred Share issuable upon the
exercise of the Rights, the Right Certificates theretofore and thereafter issued
may continue to express the Purchase Price and the number of one one-thousandths
of a Preferred Share which were expressed in the initial Right Certificates
issued hereunder.

          (k) Before taking any action that would cause an adjustment reducing
the Purchase Price below the then par value, if any, of the number of one one-
thousandths of a Preferred Share, Common Shares or other securities issuable
upon exercise of the Rights, the Corporation shall take any corporate action
which may, in the opinion of its counsel, be necessary in order that the
Corporation may validly and legally issue such number of fully paid and non-
assessable one one-thousandths of a Preferred Share, Common Shares or other
securities at such adjusted Purchase Price.

          (l) 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 Corporation 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 Preferred Shares, Common Shares or other securities of the Corporation,
if any, issuable upon such exercise over and above the Preferred Shares, Common
Shares or other securities of the Corporation, if any, issuable upon exercise on
the basis of the Purchase Price in effect prior to such adjustment; provided,
                                                                    --------
however, that the Corporation shall deliver to such holder a due bill or other
-------
appropriate instrument evidencing such holder's right to receive such additional
shares upon the occurrence of the event requiring such adjustment.

          (m) Anything in this Section 11 to the contrary notwithstanding, the
Corporation 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 it in its sole discretion shall determine to be advisable in
order that any (i) consolidation or subdivision of the Preferred Shares, (ii)
issuance wholly for cash of Preferred Shares at less than the current market
price, (iii) issuance wholly for cash of Preferred Shares or securities which by
their terms are convertible into or exchangeable for Preferred Shares, (iv)
stock dividends or (v) issuance of rights, options or warrants referred to in
this Section 11, hereafter made by the Corporation to holders of its Preferred
Shares shall not be taxable to such stockholders.

                                       17
<PAGE>

          (n) The Corporation 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 Corporation in a transaction which does not violate
Section 11(o) hereof), (ii) merge with or into any other Person (other than a
Subsidiary of the Corporation in a transaction which does not violate Section
11(o) 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
Corporation and its Subsidiaries (taken as a whole) to any other Person or
Persons (other than the Corporation and/or any of its Subsidiaries in one or
more transactions each of which does not violate this Section 11(n)), if (x) at
the time of or immediately after such consolidation, merger, sale or transfer
there are any charter or by-law provisions or any rights, warrants or other
instruments or securities outstanding or agreements in effect or other actions
taken, which would materially 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 or sale, 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.  The Corporation
shall not consummate any such consolidation, merger, sale or transfer unless
prior thereto the Corporation and such other Person shall have executed and
delivered to the Rights Agent a supplemental agreement evidencing compliance
with this Section 11(n).

          (o) The Corporation covenants and agrees that, after the Distribution
Date, it will not, except as permitted by Section 23 or Section 27 hereof, take
(or permit any Subsidiary to take) any action the purpose of which is to, or if
at the time such action is taken it is reasonably foreseeable that the effect of
such action is to, materially diminish or otherwise eliminate the benefits
intended to be afforded by the Rights.

          (p) The exercise of Rights under Section 11(a)(ii) shall only result
in the loss of rights under Section 11(a)(ii) to the extent so exercised and
shall not otherwise affect the rights represented by the Rights under this
Rights Agreement, including the rights represented by Section 13.

     Section 12.  Certificate of Adjusted Purchase Price or Number of Shares.
                  ----------------------------------------------------------
Whenever an adjustment is made as provided in Sections 11 or 13 hereof, the
Corporation shall promptly (a) prepare a certificate setting forth such
adjustment, and a brief reasonably detailed statement of the facts and
computations accounting for such adjustment, (b) file with the Rights Agent and
with each transfer agent for the Common Shares and the Preferred Shares a copy
of such certificate and (c) mail a brief summary thereof to each holder of a
Right Certificate 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 have no duty with respect to and shall not be deemed
to have knowledge of such adjustment unless and until it shall have received
such certificate.

     Section 13.  Consolidation, Merger or Sale or Transfer of Assets or Earning
                  --------------------------------------------------------------
Power.
-----

          (a) In the event that, on or following the Shares Acquisition Date,
directly or indirectly, (x) the Corporation shall consolidate with, or merge
with and into, any Interested

                                       18
<PAGE>

Stockholder or, if in such merger or consolidation all holders of Common Stock
are not treated alike, any other Person, (y) the Corporation shall consolidate
with, or merge with, any Interested Stockholder or, if in such merger or
consolidation all holders of Common Stock are not treated alike, any other
Person, and the Corporation shall be the continuing or surviving corporation of
such consolidation or merger (other than, in a case of any transaction described
in (x) or (y), a merger or consolidation which would result in all of the
securities generally entitled to vote in the election of directors ("voting
                                                                     ------
securities") of the Corporation outstanding immediately prior thereto
----------
continuing to represent (either by remaining outstanding or by being converted
into securities of the surviving entity) all of the voting securities of the
Corporation or such surviving entity outstanding immediately after such merger
or consolidation and the holders of such securities not having changed as a
result of such merger or consolidation), or (z) the Corporation 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
Corporation and its Subsidiaries (taken as a whole) to any Interested
Stockholder or Stockholders or, if in such transaction all holders of Common
Stock are not treated alike, any other Person (other than the Corporation or any
Subsidiary of the Corporation in one or more transactions each of which does not
violate Section 11(n) hereof), then, and in each such case (except as provided
in Section 13(d) hereof), proper provision shall be made so that (i) each holder
of a Right, except as provided in Section 7(e) hereof, shall thereafter have the
right to receive, upon the exercise thereof at a price equal to the then current
Purchase Price, in accordance with the terms of this Agreement and in lieu of
Preferred Shares, such number of freely tradable Common Shares of the Principal
Party (as hereinafter defined), not subject to any liens, encumbrances, rights
of first refusal or other adverse claims, as shall equal the result obtained by
(A) multiplying the then current Purchase Price by the number of one one-
thousandths of a Preferred Share for which a Right is then exercisable (without
taking into account any adjustment previously made pursuant to Section
11(a)(ii)) and dividing that product by (B) 50% of the then current per share
market price of the Common Shares of such Principal Party (determined pursuant
to Section 11(d) hereof) 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
Corporation pursuant to this Agreement; (iii) the term "Corporation" 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; and (iv)
such Principal Party shall take such steps (including, but not limited to, the
reservation of a sufficient number of its Common Shares) 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 the Common Shares thereafter deliverable upon the exercise of
the Rights.

          (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 Common Shares of the Corporation are converted in such
merger or consolidation, and if no securities are so issued, the Person that is
the other party to such merger or consolidation (including, if applicable, the
Corporation if it is the surviving corporation); and

                                       19
<PAGE>

               (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 receiving the
greatest portion of the assets or earning power transferred pursuant to such
transaction or transactions; provided, however, that in any of the foregoing
                             --------  -------
cases, (1) if the Common Shares of such Person are not at such time and have not
been continuously over the preceding 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 Shares of which are and have been so registered,
"Principal Party" shall refer to such other Person; (2) in case such Person is a
Subsidiary, directly or indirectly, of more than one Person, the Common Shares
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 Shares having the
greatest aggregate market value; and (3) in case such Person is owned, directly
or indirectly, by a joint venture formed by two or more Persons that are not
owned, directly or indirectly, by the same Person, the rules set forth in (1)
and (2) above shall apply to each of the chains of ownership having an interest
in such joint venture as if such party were a "Subsidiary" of both or all of
such joint venturers and the Principal Parties in each such chain shall bear the
obligations set forth in this Section 13 in the same ratio as their direct or
indirect interests in such Person bear to the total of such interests.

          (c) The Corporation shall not consummate any such consolidation,
merger, sale or transfer unless the Principal Party shall have a sufficient
number of its authorized Common Shares 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 Corporation 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, merger, sale or transfer mentioned in paragraph (a) of this
Section 13, the Principal Party at its own expense shall:

              (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 Final Expiration Date;

              (ii)  use its best efforts to qualify or register the Rights and
the securities purchasable upon exercise of the Rights under the blue sky laws
of such jurisdictions as may be necessary or appropriate; and

              (iii) deliver to holders of the Rights historical financial
statements for the Principal Party 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 or consolidations or sales or other transfers.  The rights under this
Section 13 shall be in addition to the rights to exercise Rights and adjustments
under Section 11(a)(ii) and shall survive any exercise thereof.

                                       20
<PAGE>

          (d) Notwithstanding anything in this Agreement to the contrary, this
Section 13 shall not be applicable to a transaction described in subparagraphs
(x) and (y) of Section 13(a) if:  (i) such transaction is consummated with a
Person or Persons who acquired Common Shares pursuant to a Permitted Offer (or a
wholly owned Subsidiary of any such Person or Persons); (ii) the price per
Common Share offered in such transaction is not less than the price per Common
Share paid to all holders of Common Shares whose shares were purchased pursuant
to such Permitted Offer; and (iii) the form of consideration offered in such
transaction is the same as the form of consideration paid pursuant to such
Permitted Offer.  Upon consummation of any such transaction contemplated by this
Section 13(d), all Rights hereunder shall expire.

     Section 14.  Fractional Rights and Fractional Shares.
                  ---------------------------------------

          (a) The Corporation shall not be required to issue fractions of Rights
or to distribute Right Certificates which evidence fractional Rights.  In lieu
of such fractional Rights, there shall be paid to the registered holders of the
Right 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 the 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 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 Corporation.  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 Corporation shall be
used.

          (b) The Corporation shall not be required to issue fractions of
Preferred Shares (other than fractions which are one one-thousandth or integral
multiples of one one-thousandth of a Preferred Share) upon exercise of the
Rights or to distribute certificates which evidence fractional Preferred Shares
(other than fractions which are one one-thousandth or integral multiples of one
one-thousandth of a Preferred Share).  Fractions of Preferred Shares in integral
multiples of one one-thousandth of a Preferred Share may, at the election of the
Corporation, be evidenced by depositary receipts, pursuant to an appropriate
agreement between the Corporation and a depositary selected by it; provided,
                                                                   --------
that such agreement shall provide that the holders of such depositary receipts
shall have the rights, privileges and preferences to which they are entitled as
beneficial owners of the Preferred Shares represented by such depositary
receipts.  In lieu of fractional Preferred Shares that are not one one-
thousandth or integral

                                       21
<PAGE>

multiples of one one-thousandth of a Preferred Share, the Corporation shall pay
to the registered holders of Right 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 Preferred Share. For the purposes of this Section
14(b), the current market value of a Preferred Share shall be the closing price
of a Preferred Share (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 one of the transactions or events
specified in Section 11 giving rise to the right to receive Common Shares,
capital stock equivalents (other than Preferred Shares) or other securities upon
the exercise of a Right, the Corporation shall not be required to issue
fractions of shares or units of such Common Shares, capital stock equivalents or
other securities upon exercise of the Rights or to distribute certificates which
evidence fractions of such Common Shares, capital stock equivalents or other
securities.  In lieu of fractional shares or units of such Common Shares,
capital stock equivalents or other securities, the Corporation may pay to the
registered holders of Right 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 a share or unit of such Common Shares, capital stock equivalents
or other securities.  For purposes of this Section 14(c), the current market
value shall be determined in the manner set forth in Section 11(d) hereof for
the Trading Day immediately prior to the date of such exercise and, if such
capital stock equivalent is not traded, each such capital stock equivalent shall
have the value of one one-thousandth of a Preferred Share.

          (d) The holder of a Right by the acceptance of the Right expressly
waives his right to receive any fractional Rights or any fractional share upon
exercise of a Right (except as provided above).  The Rights Agent shall not be
deemed to have knowledge of, and shall have no duty in respect of, the issuance
of fractional Rights or fractional shares until it shall have received
instructions from the Corporation concerning the issuance of the fractional
Rights or fractional shares upon which instructions the Rights Agent may
conclusively rely.

     Section 15.  Rights of Action.  All rights of action in respect of this
                  ----------------
Agreement, excepting the rights of action given to the Rights Agent under
Section 18 hereof, are vested in the respective registered holders of the Right
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Shares); and any registered holder of any Right Certificate (or, prior to
the Distribution Date, of the Common Shares), without the consent of the Rights
Agent or of the holder of any other Right Certificate (or, prior to the
Distribution Date, of the Common Shares), may, in his own behalf and for his own
benefit, enforce, and may institute and maintain any suit, action or proceeding
against the Corporation to enforce, or otherwise act in respect of, his right to
exercise the Rights evidenced by such Right Certificate in the manner provided
in such Right 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 will be entitled to specific performance of
the obligations under, and injunctive relief against actual or threatened
violations of the obligations of any Person subject to, this Agreement.

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

                                       22
<PAGE>

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

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

          (c) subject to Section 7(f) hereof, the Corporation and the Rights
Agent may deem and treat the Person in whose name the Right Certificate (or,
prior to the Distribution Date, the associated Common Shares certificate) is
registered as the absolute owner thereof and of the Rights evidenced thereby
(notwithstanding any notations of ownership or writing on the Right Certificate
or the associated Common Shares certificate made by anyone other than the
Corporation or the Rights Agent) for all purposes whatsoever, and neither the
Corporation 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 Corporation nor the Rights Agent shall have any liability to any
holder of a Right or a beneficial interest in 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, judgment,
decree or ruling (whether interlocutory or final) 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 Corporation must use its
                                --------  -------
best efforts to have any such order, decree, judgment, or ruling lifted or
otherwise overturned as soon as possible.

     Section 17.  Right Certificate Holder Not Deemed a Stockholder.  No holder,
                  -------------------------------------------------
as such, of any Right Certificate shall be entitled to vote, receive dividends
or be deemed for any purpose the holder of the Preferred Shares or any other
securities of the Corporation which may at any time be issuable on the exercise
of the Rights represented thereby, nor shall anything contained herein or in any
Right Certificate be construed to confer upon the holder of any Right
Certificate, as such, any of the rights of a stockholder of the Corporation 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 25 hereof), or to receive dividends
or other distributions or to exercise any preemptive or subscription rights, or
otherwise, until the Right or Rights evidenced by such Right Certificate shall
have been exercised in accordance with the provisions hereof.

     Section 18.  Concerning the Rights Agent.  The Corporation 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 other disbursements incurred in the preparation,
execution, delivery, amendment, administration and execution of this Agreement
and the exercise and performance of its duties hereunder.  The Corporation also
agrees to indemnify the Rights Agent for, and to hold it harmless against, any

                                       23
<PAGE>

loss, liability, damage, judgment, fine, penalty, claim, demand, settlement,
cost or expense, incurred without gross negligence, bad faith or willful
misconduct on the part of the Rights Agent, for any action taken, suffered or
omitted by the Rights Agent in connection with the acceptance and administration
of this Agreement, including without limitation the costs and expenses of
defending against any claim of liability in the premises.  The indemnity
provided for herein shall survive the expiration of the Rights and the
termination of this Agreement.

     The Rights Agent shall be authorized and protected and shall incur no
liability for, or in respect of, any action taken, suffered or omitted by it in
connection with, its acceptance and administration of this Agreement in reliance
upon any Right Certificate or certificate for Common Shares or for other
securities of the Corporation, instrument of assignment or transfer, power of
attorney, endorsement, affidavit, letter, notice, direction, consent,
certificate, statement, or other paper or document (collectively, "Documents")
                                                                   ---------
believed by it to be genuine and to be signed, executed and, where necessary,
verified or acknowledged, by the proper Person or Persons.  The Rights Agent
shall not be deemed to have knowledge of, and shall have no duty in respect of,
any such Documents, until it receives notice or instructions in respect thereof.
In no case will the Rights Agent be liable for special, indirect, punitive,
incidental or consequential loss or damage of any kind whatsoever, even if the
Rights Agent has been advised of the likelihood of such loss or damage.

     Section 19.  Merger or Consolidation or Change of Name of Rights Agent.
                  ---------------------------------------------------------
Any Person into which the Rights Agent or any successor Rights Agent may be
merged or with which it may be consolidated, or any Person resulting from any
merger or consolidation to which the Rights Agent or any successor Rights Agent
shall be a party, or any Person succeeding to the stock transfer or all or
substantially all of the shareholder services 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 that such Person 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 Right Certificates
shall have been countersigned but not delivered, any such successor Rights Agent
may adopt the countersignature of a predecessor Rights Agent and deliver such
Right Certificates so countersigned; and in case at that time any of the Right
Certificates shall not have been countersigned, any successor Rights Agent may
countersign such Right Certificates either in the name of the predecessor or in
the name of the successor Rights Agent; and in all such cases such Right
Certificates shall have the full force provided in the Right Certificates and in
this Agreement.  In case at any time the name of the Rights Agent shall be
changed and at such time any of the Right Certificates shall have been
countersigned but not delivered, the Rights Agent may adopt the countersignature
under its prior name and deliver Right Certificates so countersigned; and in
case at that time any of the Right Certificates shall not have been
countersigned, the Rights Agent may countersign such Right Certificates either
in its prior name or in its changed name; and in all such cases such Right
Certificates shall have the full force provided in the Right Certificates and in
this Agreement.

     Section 20.  Duties of Rights Agent.  The Rights Agent undertakes only
                  ----------------------
those duties and obligations expressly imposed by this Agreement (and no implied
duties or obligations) upon the

                                       24
<PAGE>

following terms and conditions, by all of which the Corporation and the holders
of Right Certificates, by their acceptance thereof, shall be bound:

          (a) The Rights Agent may consult with legal counsel (who may be legal
counsel for the Corporation), and the advice or opinion of such counsel shall be
full and complete authorization and protection to the Rights Agent and the
Rights Agent shall incur no liability for or in respect of, any action taken,
suffered 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 an Acquiring Person and the
determination of the current market price of any Security) be proved or
established by the Corporation prior to taking, suffering or omitting 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 any one of the Chairman of the Board, the
Chief Executive Officer, the President, any Vice President, the Treasurer or the
Secretary of the Corporation and delivered to the Rights Agent; and such
certificate shall be full authorization and protection to the Rights Agent and
the Rights Agent shall incur no liability in respect of any action taken,
suffered or omitted in good faith by it under the provisions of this Agreement
in reliance upon such certificate.

          (c) The Rights Agent shall be liable hereunder only for its own gross
negligence, bad faith or willful misconduct.

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

          (e) The Rights Agent shall not be under any liability or
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 Right Certificate (except its
countersignature thereof); nor shall it be responsible for any breach by the
Corporation of any covenant or condition contained in this Agreement or in any
Rights Certificate; nor shall it be responsible for any change in the
exercisability of the Rights (including the Rights becoming null and void
pursuant to Section 7(e) hereof) or 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 Right Certificates after receipt of the certificate described in
Section 12 hereof); nor shall it by any act hereunder be deemed to make any
representation or warranty as to the authorization or reservation of any
Preferred Shares or Common Shares to be issued pursuant to this Agreement or any
Right Certificate or as to whether any Preferred Shares or Common Shares will,
when issued, be validly authorized and issued, fully paid and non-assessable.

                                       25
<PAGE>

          (f) The Corporation 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 any
one of the Chairman of the Board, the Chief Executive Officer, the President,
any Vice President, the Treasurer or the Secretary of the Corporation, and to
apply to such officers for advice or instructions in connection with its duties,
and instructions shall be full authorization and protection to the Rights Agent
and the Rights Agent shall incur no liability for or in respect of any action
taken, suffered or omitted by it in good faith or lack of action in accordance
with instructions of any such officer or for any delay in acting while waiting
for those instructions.  Any application by the Rights Agent for written
instructions from the Corporation 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 or after which such action shall be
taken or suffered or such omission shall be effective.  The Rights Agent shall
not be liable or responsible for any action taken or suffered 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 any officer of the
Corporation 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 instruction in response to such application
specifying the action to be taken, suffered or omitted.

          (h) The Rights Agent and any stockholder, affiliate, director, officer
or employee of the Rights Agent may buy, sell or deal in any of the Rights or
other securities of the Corporation or become pecuniarily interested in any
transaction in which the Corporation may be interested, or contract with or lend
money to the Corporation 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 Corporation or for any other
Person or legal entity.

          (i) 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 Corporation or any other Person resulting from any
such act, default, neglect or misconduct, absent gross negligence, bad faith or
willful misconduct in the selection and continued employment thereof.

          (j) 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
it believes that repayment of such funds or adequate indemnification against
such risk or liability is not reasonably assured to it.

          (k) 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

                                       26
<PAGE>

purchase, as the case may be, has not been completed, the Rights Agent shall not
take any further action with respect to such requested exercise of transfer
without first consulting with the Corporation.

     Section 21.  Change of Rights Agent.  The Rights Agent or any successor
                  ----------------------
Rights Agent may resign and be discharged from its duties under this Agreement
upon 30 days' notice in writing mailed to the Corporation and to each transfer
agent of the Common Shares or Preferred Shares by registered or certified mail,
and to the holders of the Right Certificates by first-class mail.  The
Corporation may remove the Rights Agent or any successor Rights Agent upon 60
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 Shares or Preferred
Shares by registered or certified mail, and to holders of the Right Certificates
by first-class mail.  If the Rights Agent shall resign or be remove d or shall
otherwise become incapable of acting, the Corporation shall appoint a successor
to the Rights Agent.  If the Corporation shall fail to make such appointment
within a period of 60 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 Right Certificate (who shall,
with such notice, submit his Right Certificate for inspection by the
Corporation), then the registered holder of any Right 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 Corporation or by such a
court, shall be a Person organized and doing business under the laws of the
United States or of the States of Delaware or New York (or of any other state of
the United States so long as such Person is authorized to do business in the
States of Delaware or New York), in good standing, having an office in the
States of Delaware or New York, which 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 $50,000,000.  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 Corporation shall file notice thereof in writing with the
predecessor Rights Agent and each transfer agent of the Common Shares or
Preferred Shares, and mail a notice thereof in writing to the registered holders
of the Right 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 Right Certificates.  Notwithstanding any of
                  ----------------------------------
the provisions of this Agreement or of the Rights to the contrary, the
Corporation may, at its option, issue new Right 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 Right Certificates
made in accordance with the provisions of this Agreement.

     In addition, in connection with the issuance or sale of Common Shares
following the Distribution Date and prior to the earlier of the Redemption Date
and the Final Expiration Date, the Corporation (a) shall with respect to Common
Shares so issued or sold pursuant to the

                                       27
<PAGE>

exercise of stock options or under any employee plan or arrangement, or upon the
exercise, conversion or exchange of securities, notes or debentures issued by
the Corporation, and (b) may, in any other case, if deemed necessary or
appropriate by the Board of Directors of the Corporation, issue Right
Certificates representing the appropriate number of Rights in connection with
such issuance or sale; provided, however, that (i) the Corporation shall not
                       --------  -------
be obligated to issue any such Right Certificates if, and to the extent that,
the Corporation shall be advised by counsel that such issuance would create a
significant risk of material adverse tax consequences to the Corporation or the
Person to whom such Right Certificate would be issued, and (ii) no Right
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 Corporation may, at its
option, redeem all but not less than all of the then outstanding Rights at a
redemption price of $.01 per Right, as such amount may be appropriately adjusted
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"), at any time prior to the earlier of (x) the occurrence
     ----------------
of a Section 11(a)(ii) Event, or (y) the Final Expiration Date.

                  (ii) In addition, the Board of Directors of the Corporation
may, at its option, at any time following the occurrence of a Section 11(a)(ii)
Event and the expiration of any period during which the holder of Rights may
exercise the rights under Section 11(a)(ii) but prior to any Section 13 Event
redeem all but not less than all of the then outstanding Rights at the
Redemption Price (x) in connection with any merger, consolidation or sale or
other transfer (in one transaction or in a series of related transactions) of
assets or earning power aggregating 50% or more of the earning power of the
Corporation and its subsidiaries (taken as a whole) in which all holders of
Common Shares are treated alike and not involving (other than as a holder of
Common Shares being treated like all other such holders) an Interested
Stockholder or (y) (aa) if and for so long as the Acquiring Person is not
thereafter the Beneficial Owner of 15% of the Common Shares, and (bb) at the
time of redemption no other Persons are Acquiring Persons.

          (b) In the case of a redemption permitted under Section 23(a)(i),
immediately upon the date for redemption set forth (or determined in the manner
specified in) in a resolution of the Board of Directors of the Corporation
ordering the redemption of the Rights, 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.  In the case of a redemption permitted only under
Section 23(a)(ii), the right to exercise the Rights will terminate and represent
only the right to receive the Redemption Price upon the later of ten Business
Days following the giving of such notice or the expiration of any period during
which the rights under Section 11(a)(ii) may be exercised.  The Corporation
shall promptly give public notice and notify the Rights Agent of any such
redemption; provided, however, that the failure to give, or any defect in, any
            --------  -------
such notice shall not affect the validity of such redemption.  Within 10 days
after such date for redemption set forth in a resolution of the Board of
Directors ordering the redemption of the Rights, the Corporation shall mail a
notice of redemption to all the holders of the then outstanding Rights at their
last addresses as they appear upon the registry books of the Rights Agent or,
prior to the Distribution Date, on the registry

                                       28
<PAGE>

books of the transfer agent for the Common Shares. 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. Neither the Corporation
nor any of its Affiliates or Associates may redeem, acquire or purchase for
value any Rights at any time in any manner other than that specifically set
forth in this Section 23 and other than in connection with the purchase of
Common Shares prior to the Distribution Date.

          (c) The Corporation may, at its option, discharge all of its
obligations with respect to the Rights by (i) issuing a press release announcing
the manner of redemption of the Rights in accordance with this Agreement and
(ii) mailing payment of the Redemption Price to the registered holders of the
Rights at their last addresses as they appear on the registry books of the
Rights Agent or, prior to the Distribution Date, on the registry books of the
Transfer Agent of the Common Shares, and upon such action, all outstanding
Rights and Right Certificates shall be null and void without any further action
by the Corporation.

     Section 24.  Exchange.
                  --------

          (a) The Board of Directors of the Corporation may, at its option, at
any time after the time that any Person becomes an Acquiring Person, exchange
all or part of the then outstanding and exercisable Rights (which shall not
include Rights that have become null and void pursuant to the provisions of
Section 7(e) and Section 11(a)(ii) hereof) for Common Shares of the Corporation
at an exchange ratio of one Common Share per Right, appropriately adjusted to
reflect any stock split, stock dividend or similar transaction occurring after
the date hereof (such exchange ratio being hereinafter referred to as the
"Exchange Ratio"). Notwithstanding the foregoing, the Corporation's Board of
 --------------
Directors shall not be empowered to effect such exchange at any time after any
Person (other than the Corporation, any Subsidiary of the Corporation, any
employee benefit plan of the Corporation or any such Subsidiary, any Person
organized, appointed or established by the Corporation for or pursuant to the
terms of any such plan or any trustee, administrator or fiduciary of such a
plan), together with all Affiliates and Associates of such Person, becomes the
Beneficial Owner of 50% or more of the Common Shares then outstanding.

          (b) Immediately upon the action of the Board of Directors of the
Corporation ordering the exchange of any Rights pursuant to subsection (a) of
this Section 24 and without any further action and without any notice, the right
to exercise such rights shall terminate and the only right thereafter of the
holders of such Rights shall be to receive that number of Common Shares equal to
the number of such rights held by such holder multiplied by the Exchange Ratio.
The Corporation shall promptly give public notice and notify the Rights Agent of
any such exchange; provided, however, that the failure to give, or any defect
                   --------  -------
in, such notice shall not affect the validity of such exchange.  The Corporation
promptly shall mail a notice of any such exchange to all of the holders of such
Rights at their last addresses as they appear upon the registry books of the
Rights Agent.  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 exchange will state the method by which the exchange of the Common Shares for
Rights will be effected and, in the event of any partial exchange, the number of
Rights will be exchanged.  Any partial exchange shall be effected pro rata based
on the number of Rights (other than Rights

                                       29
<PAGE>

which have become null and void pursuant to the provisions of Section 7(e) and
Section 11(a)(ii) hereof) held by each holder of Rights.

          (c) In any exchange pursuant to this Section 24, the Corporation, at
its option, may substitute Preferred Shares (or equivalent preferred shares, as
such term is defined in Section 11(b) hereof) for some or all of the Common
Shares exchangeable for Rights, at the initial rate of one one-thousandth of a
Preferred Share (or equivalent preferred share) for each Common Share, as
appropriately adjusted to reflect adjustments in the voting rights of the
Preferred Shares pursuant to the terms thereof, so that the fraction of a
Preferred Share delivered in lieu of each Common Share shall have the same
voting rights as one Common Share.

          (d) The Board shall not authorize any exchange transaction referred to
in Section 24(a) hereof unless at the time such exchange is authorized there
shall be sufficient Common Shares or Preferred Shares issued but not
outstanding, or authorized but unissued, to permit the exchange of Rights as
contemplated in accordance with this Section 24.

     Section 25.  Notice of Certain Events.
                  ------------------------

          (a) In case the Corporation shall propose (i) to pay any dividend
payable in stock of any class to the holders of its Preferred Shares or to make
any other distribution to the holders of its Preferred Shares (other than a
regularly quarterly cash dividend), (ii) to offer to the holders of its
Preferred Shares rights or warrants to subscribe for or to purchase any
additional Preferred Shares or shares of stock of any class or any other
securities, rights or options, (iii) to effect any reclassification of its
Preferred Shares (other than a reclassification involving only the subdivision
of outstanding Preferred Shares), (iv) to effect any consolidation or merger
into or with any other Person (other than a Subsidiary of the Corporation in a
transaction which does not violate 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 or more transactions, of 50% or more of the
assets or earning power of the Corporation and its Subsidiaries (taken as a
whole) to any other Person or Persons (other than the Corporation and/or any of
its Subsidiaries in one or more transactions each of which does not violate
Section 11(n) hereof), or (v) to effect the liquidation, dissolution or winding
up of the Corporation, then, in each such case, the Corporation shall give to
the Rights Agent and to each holder of a Right Certificate, in accordance with
Section 26 hereof, a notice of such proposed action and file a certificate with
the Rights Agent to that effect, which shall specify the record date for the
purposes of such stock dividend, or distribution of rights or warrants, or the
date on which such reclassification, consolidation, merger, sale, transfer,
liquidation, dissolution, or winding up is to take place and the date of
participation therein by the holders of the Preferred Shares, 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 20 days prior to the record date
for determining holders of the Preferred Shares for purposes of such action, and
in the case of any such other action, at least 20 days prior to the date of the
taking of such proposed action or the date of participation therein by the
holders of the Preferred Shares, whichever shall be the earlier.

          (b) In case of a Section 11(a)(ii) Event, then (i) the Corporation
shall as soon as practicable thereafter give to each holder of a Right
Certificate, in accordance with Section 26 hereof, a notice of the occurrence of
such event, which notice shall describe such event and the

                                       30
<PAGE>

consequences of such event to holders of Rights under Section 11(a)(ii) hereof,
and (ii) all references in the preceding paragraph (a) to Preferred Shares shall
be deemed thereafter to refer also to Common Shares and/or, if appropriate,
other securities of the Corporation.

     Section 26.  Notices.  Notices or demands authorized by this Agreement to
                  -------
be given or made by the Rights Agent or by the holder of any Right Certificate
to or on the Corporation shall be sufficiently given or made if sent by first-
class mail, postage prepaid, addressed (until another address is filed in
writing with the Rights Agent) as follows:

               NNG, Inc.
               1840 Century Park East
               Los Angeles, California 90067
               Attention:  Office of the Secretary

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

               EquiServe Trust Company, N. A.
               P.O. Box 842010
               Boston, Massachusetts 002284-2010
               Attention:  General Counsel

Notices or demands authorized by this Agreement to be given or made by the
Corporation or the Rights Agent to the holder of any Right Certificate or, if
prior to the Distribution Date, to the holder of certificates representing
Common Shares 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 Corporation.

     Section 27.  Supplements and Amendments.  Except as set forth in the
                  --------------------------
penultimate sentence of this Section 27, prior to the Distribution Date, the
Corporation may and the Rights Agent shall, if the Corporation so directs,
supplement or amend any provision of this Agreement without the approval of any
holders of certificates representing Common Shares.  From and after the
Distribution Date, the Corporation may and the Rights Agent shall, if the
Corporation so directs, supplement or amend this Agreement without the approval
of any holders of Right 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 provisions herein, (iii) to shorten or lengthen any
time period hereunder or (iv) to change or supplement the provisions hereunder
in any manner which the Corporation may deem necessary or desirable and which
shall not adversely affect the interests of the holders of Right Certificates
(other than an Acquiring Person or an Affiliate or Associate of an Acquiring
Person); provided, however, that 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 any such
lengthening 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 Corporation

                                       31
<PAGE>

which states that the proposed supplement or amendment is in compliance with the
terms of this Section 27, and if requested by the Rights Agent an opinion of
counsel, the Rights Agent shall execute such supplement or amendment; provided,
                                                                      --------
that such supplement or amendment does not adversely affect the rights or
obligations of the Rights Agent under Section 18 or Section 20 of this
Agreement. Prior to the Distribution Date, the interests of the holders of
Rights shall be deemed coincident with the interests of the holders of Common
Shares.

     Section 28.  Determination and Actions by the Board of Directors, etc.  The
                  ---------------------------------------------------------
Board of Directors of the Corporation shall have the exclusive power and
authority to administer this Agreement and to exercise all rights and powers
specifically granted to the Board, or the Corporation, 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, without limitation, a
determination to redeem or not redeem the Rights or to amend the Agreement and
whether any proposed amendment adversely affects the interests of the holders of
Right Certificates).  For all purposes of this Agreement, any calculation of the
number of Common Shares or other securities outstanding at any particular time,
including for purposes of determining the particular percentage of such
outstanding Common Shares or any other securities of which any Person is the
Beneficial Owner, shall be made in accordance with the last sentence of Rule
13d-3(d)(1)(i) of the General Rules and Regulations under the Exchange Act as in
effect on the date of 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
in good faith (and the Rights Agent shall be able to assume that the Board acted
in such good faith), shall (x) be final, conclusive and binding on the
Corporation, the Rights Agent, the holders of the Right Certificates and all
other Persons, and (y) not subject the Board to any liability to the holders of
the Right Certificates.

     Section 29.  Successors.  All the covenants and provisions of this
                  ----------
Agreement by or for the benefit of the Corporation or the Rights Agent shall
bind and inure to the benefit of their respective successors and assigns
hereunder.

     Section 30.  Benefits of this Agreement.  Nothing in this Agreement shall
                  --------------------------
be construed to give to any person or corporation other than the Corporation,
the Rights Agent and the registered holders of the Right Certificates (and,
prior to the Distribution Date, the Common Shares) any legal or equitable right,
remedy or claim under this Agreement; but this Agreement shall be for the sole
and exclusive benefit of the Corporation, the Rights Agent and the registered
holders of the Right Certificates (and, prior to the Distribution Date, the
Common Shares).

     Section 31.  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.

     Section 32.  Governing Law.  This Agreement, each Right and each Right
                  -------------
Certificate issued hereunder shall be deemed to be a contract made under the
laws of the State of Delaware

                                       32
<PAGE>

and for all purposes shall be governed by and construed in accordance with the
laws of such State applicable to contracts to be made and performed entirely
within such State; except that all provisions regarding the rights, duties and
obligations of the Rights Agent shall be governed by and construed in accordance
with the laws of the State of New York applicable to contracts made and to be
performed entirely within such State.

     Section 33.  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 34.  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.

                           [signature page follows]

                                       33
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and attested, all as of the date and year first above written.

                                      NNG, INC.

Attest:

By: /s/ Kathleen M. Salmas            By: /s/ John H. Mullan
    --------------------------            ------------------------------------
    Name:  Kathleen M. Salmas             Name: John H. Mullan
    Title: Assistant Secretary                  Title: Corporate Vice President,
                                                Secretary and Associate General
                                                Counsel

                                       EQUISERVE TRUST COMPANY, N. A.

Attest:

By: /s/ Kevin Laurita                 By: /s/ Gregory P. Denman
    --------------------------            ------------------------------------
    Name:  Kevin Laurita                   Name:  Gregory P. Denman
    Title: Managing Director               Title: Senior Account Manager

                                       34
<PAGE>

                                                                       Exhibit A
                                                                       ---------

                         NORTHROP GRUMMAN CORPORATION
                             (FORMERLY NNG, INC.)
                    CERTIFICATE OF DESIGNATION, PREFERENCES
                  AND RIGHTS OF SERIES A JUNIOR PARTICIPATING
                                PREFERRED STOCK

                           (Pursuant to Section 151
           of the General Corporation Law of the State of Delaware)

     We, Albert F. Myers, Corporate Vice President and Treasurer and John H.
Mullan, Corporate Vice President, Secretary and Associate General Counsel of
NNG, Inc., a corporation organized and existing under the General Corporation
Law of the State of Delaware (the "Corporation"), in accordance with the
provisions of Section 103 thereof, do hereby certify:

     That pursuant to the authority conferred upon the Board of Directors by the
Corporation's Amended and Restated Certificate of Incorporation (as amended from
time to time, the "Certificate of Incorporation"), the Board of Directors, by a
unanimous written consent dated January 31, 2001, adopted the following
resolution creating a series of shares of Preferred Stock designated as Series A
Junior Participating Preferred Stock:

     WHEREAS, the Certificate of Incorporation provides that the Corporation is
authorized to issue 10,000,000 shares of preferred stock, none of which are
outstanding, now therefore it is.

     RESOLVED, that pursuant to the authority vested in the Board of Directors
of the Corporation by Article FOURTH of the Certificate of Incorporation, a
series of Preferred Stock of the Corporation be, and it hereby is, created out
of the authorized but unissued shares of the capital stock of the Corporation,
such series to be designated Series A Junior Participating Preferred Stock, par
value $1.00 per share (the "Participating Preferred Stock"), to consist of such
amounts as may be necessary to permit the issuance of Preferred Shares upon
exercise of the Rights, of which the preferences and relative and other rights,
and the qualifications, limitations or restrictions thereof, shall be as
follows:

     1.   Future Increase or Decrease.  Subject to paragraph 4(e) of this
          ---------------------------
resolution, the number of shares of said series may at any time or from time to
time be increased or decreased by the Board of Directors notwithstanding that
shares of such series may be outstanding at such time of increase or decrease.

     2.   Dividend Rate.
          -------------

          (a)  The holders of shares of Participating Preferred Stock shall be
entitled to receive, when, as and if declared by the Board of Directors out of
funds legally available for that purpose, quarterly dividends payable in cash on
the first day of each November, February, May and August in each year (each such
date being referred to herein as a "Quarterly Dividend Payment Date"),
commencing on the first Quarterly Dividend Payment Date after the first issuance
of a share or fraction of a share of Participating Preferred Stock (the "First
Issuance"),

                                      A-1
<PAGE>

in an amount per share (rounded to the nearest cent) equal to the greater of (i)
$10.00 or (ii) 1,000 times the aggregate per share amount of all cash dividends
and 1,000 times the aggregate per share amount (payable in kind) of all non-cash
dividends or other distributions, other than a dividend payable in shares of
Common Stock or a subdivision of the outstanding shares of Common Stock (by
reclassification or otherwise), declared on the Common Stock, par value $1.00
per share, of the Corporation (the "Common Stock") since the immediately
preceding Quarterly Dividend Payment Date, or, with respect to the first
Quarterly Dividend Payment Date, since the first issuance of any share or
fraction of a share of Participating Preferred Stock. In the event the
Corporation shall at any time after the First Issuance declare or pay any
dividend on the Common Stock payable in shares of Common Stock, or effect a
subdivision or combination or consolidation of the outstanding shares of Common
Stock (by reclassification or otherwise than by payment of a dividend in shares
of Common Stock) into a greater or lesser number of shares of Common Stock, then
in each such case the amount to which holders of shares of Participating
Preferred Stock were entitled immediately prior to such event under the
preceding sentence shall be adjusted by multiplying such amount by a fraction,
the numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

          (b)  On or after the first issuance of any share or fractional share
of Participating Preferred Stock, no dividend on Common Stock shall be declared
unless concurrently therewith a dividend or distribution is declared on the
Participating Preferred Stock as provided in paragraph (a) above; and the
declaration of any such dividend on the Common Stock shall be expressly
conditioned upon payment or declaration of and provision for a dividend on the
Participating Preferred Stock as above provided. In the event no dividend or
distribution shall have been declared on the Common Stock during the period
between any Quarterly Dividend Payment Date and the next subsequent Quarterly
Dividend Payment Date, a dividend of $10.00 per share on the Participating
Preferred Stock shall nevertheless be payable on such subsequent Quarterly
Dividend Payment Date.

          (c)  Whenever quarterly dividends or other dividends payable on the
Participating Preferred Stock as provided in paragraph (a) above are in arrears,
thereafter and until all accrued and unpaid dividends and distributions, whether
or not declared, on shares of Participating Preferred Stock outstanding shall
have been paid in full, the Corporation shall not redeem or purchase or
otherwise acquire for consideration shares of any stock ranking junior (either
as to dividends or upon liquidation, dissolution or winding up) to the
Participating Preferred Stock, provided that the Corporation may at any time
redeem, purchase or otherwise acquire shares of any such junior stock in
exchange for shares of any stock of the Corporation ranking junior (as to
dividends and upon dissolution, liquidation or winding up) to the Participating
Preferred Stock.

          (d)  Dividends shall begin to accrue and be cumulative on outstanding
shares of Participating Preferred Stock from the Quarterly Dividend Payment Date
next preceding the date of issue of such shares of Participating Preferred
Stock, unless the date of issue of such shares is prior to the record date for
the first Quarterly Dividend Payment Date, in which case dividends on such
shares shall begin to accrue from the date of issue of such shares, or unless
the date of issue is a Quarterly Dividend Payment Date or is a date after the
record date for the

                                      A-2
<PAGE>

determination of holders of shares of Participating Preferred Stock entitled to
receive a quarterly dividend and before such Quarterly Dividend Payment Date, in
either of which events such dividends shall begin to accrue and be cumulative
from such Quarterly Dividend Payment Date. Accrued but unpaid dividends shall
not bear interest. The Board of Directors may fix a record date for the
determination of holders of shares of Participating Preferred Stock entitled to
receive payment of a dividend distribution declared thereon, which record date
shall be no more than 30 days prior to the date fixed for the payment thereof.

     3.   Dissolution, Liquidation and Winding Up.  In the event of any
          ---------------------------------------
voluntary or involuntary dissolution, liquidation or winding up of the affairs
of the Corporation (hereinafter referred to as a "Liquidation"), the holders of
Participating Preferred Stock shall receive at least $1,000 per share, plus an
amount equal to all accrued and unpaid dividends and distributions thereon,
whether or not declared, to the date of such payment, provided that the holders
of shares of Participating Preferred Stock shall be entitled to receive at least
an aggregate amount per share equal to 1,000 times the aggregate amount to be
distributed per share to holders of Common Stock (the "Participating Preferred
Liquidation Preference"). In the event the Corporation shall at any time after
the First Issuance declare or pay any dividend on the Common Stock payable in
shares of Common Stock, or effect a subdivision or combination or consolidation
of the outstanding shares of Common Stock (by reclassification or otherwise than
by payment of a dividend in shares of Common Stock) into a greater or lesser
number of shares of Common Stock, then in each such case the aggregate amount to
which holders of shares of Participating Preferred Stock were entitled
immediately prior to such event under the preceding sentence shall be adjusted
by multiplying such amount by a fraction the numerator of which is the number of
shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

     4.   Voting Rights.  The holders of shares of Participating Preferred Stock
          -------------
shall have the following voting rights:

          (a)  Each share of Participating Preferred Stock shall entitle the
holder thereof to 1,000 votes on all matters submitted to a vote of the
stockholders of the Corporation.  In the event the Corporation shall at any time
after the First Issuance declare or pay any dividend on the Common Stock payable
in shares of Common Stock, or effect a subdivision or combination or
consolidation of the outstanding shares of Common Stock (by reclassification or
otherwise than by payment of a dividend in shares of Common Stock) into a
greater or lesser number of shares of Common Stock, then in each such case the
aggregate amount to which holders of shares of Participating Preferred Stock
were entitled immediately prior to such event under the preceding sentence shall
be adjusted by multiplying such amount by a fraction the numerator of which is
the number of shares of Common Stock outstanding immediately after such event
and the denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

          (b)  Except as otherwise provided herein, or by law, the Certificate
of Incorporation or the Restated By-laws of the Corporation (as amended from
time to time, the "By-laws"), the holders of shares of Participating Preferred
Stock and the holders of shares of

                                      A-3
<PAGE>

Common Stock shall vote together as one class on all matters submitted to a vote
of stockholders of the Corporation.

          (c)  If and whenever dividends on the Participating Preferred Stock
shall be in arrears in an amount equal to six quarterly dividend payments, then
and in such event the holders of the Participating Preferred Stock, voting
separately as a class (subject to the provisions of subparagraph (d) below),
shall be entitled at the next annual meeting of the stockholders or at any
special meeting to elect two directors.  Each share of Participating Preferred
Stock shall be entitled to one vote, and holders of fractional shares shall have
the right to a fractional vote.  Upon election, such directors shall become
additional directors of the Corporation and the authorized number of directors
of the Corporation shall thereupon be automatically increased by such number of
directors.  Such right of the holders of Participating Preferred Stock to elect
directors may be exercised until all dividends in default on the Participating
Preferred Stock shall have been paid in full, and dividends for the current
dividend period declared and funds therefor set apart, and when so paid and set
apart, the right of the holders of Participating Preferred Stock to elect such
number of directors shall cease, the term of such directors shall thereupon
terminate, and the authorized number of directors of the Corporation shall
thereupon return to the number of authorized directors otherwise in effect, but
subject always to the same provisions for the vesting of such special voting
rights in the case of any such future dividend default or defaults.  The fact
that dividends have been paid and set apart as required by the preceding
sentence shall be evidenced by a certificate executed by the President and the
Chief Financial Officer of the Corporation and delivered to the Board of
Directors.  The directors so elected by the holders of Participating Preferred
Stock shall serve until the certificate described in the preceding sentence
shall have been delivered to the Board of Directors or until their respective
successors shall be elected or appointed and qualify.

          At any time when such special voting rights have been so vested in the
holders of the Participating Preferred Stock, the Secretary of the Corporation
may, and upon the written request of the holders of record of 10% or more of the
number of shares of the Participating Preferred Stock then outstanding addressed
to such Secretary at the principal office of the Corporation in the State of
California, shall, call a special meeting of the holders of the Participating
Preferred Stock for the election of the directors to be elected by them as
hereinabove provided, to be held in the case of such written request within 40
days after delivery of such request, and in either case to be held at the place
and upon the notice provided by law and in the By-laws of the Corporation for
the holding of meetings of stockholders; provided, however, that the Secretary
                                         --------  -------
shall not be required to call such a special meeting (i) if any such request is
received less than 90 days before the date fixed for the next ensuing annual or
special meeting of stockholders or (ii) if at the time any such request is
received, the holders of Participating Preferred Stock are not entitled to elect
such directors by reason of the occurrence of an event specified in the third
sentence of subparagraph (d) below.

          (d)  If, at any time when the holders of Participating Preferred Stock
are entitled to elect directors pursuant to the foregoing provisions of this
paragraph 4, the holders of any one or more additional series of Preferred Stock
are entitled to elect directors by reason of any default or event specified in
the Certificate of Incorporation, as in effect at the time of the certificate of
designation for such series, and if the terms for such other additional series
so permit, the voting rights of the two or more series then entitled to vote
shall be combined (with

                                      A-4
<PAGE>

each series having a number of votes proportional to the aggregate liquidation
preference of its outstanding shares). In such case, the holders of
Participating Preferred Stock and of all such other series then entitled so to
vote, voting as a class, shall elect such directors. If the holders of any such
other series have elected such directors prior to the happening of the default
or event permitting the holders of Participating Preferred Stock to elect
directors, or prior to a written request for the holding of a special meeting
being received by the Secretary of the Corporation from the holders of not less
than 10% of the then outstanding shares of Participating Preferred Stock, then
such directors so previously elected will be deemed to have been elected by and
on behalf of the holders of Participating Preferred Stock as well as such other
series, without prejudice to the right of the holders of Participating Preferred
Stock to vote for directors if such previously elected directors shall resign,
cease to serve or fail to stand for reelection while the holders of
Participating Preferred Stock are entitled to vote. If the holders of any such
other series are entitled to elect in excess of two directors, the Participating
Preferred Stock shall not participate in the election of more than two such
directors, and those directors whose terms first expire shall be deemed to be
the directors elected by the holders of Participating Preferred Stock; provided,
                                                                       --------
however, that, if at the expiration of such terms the holders of Participating
-------
Preferred Stock are entitled to vote in the election of directors pursuant to
the provisions of this paragraph 4, then the Secretary of the Corporation shall
call a meeting (which meeting may be the annual meeting or special meeting of
stockholders referred to in subparagraph (c)) of the holders of Participating
Preferred Stock for the purpose of electing replacement directors (in accordance
with the provisions of this paragraph 4) to be held on or prior to the time of
expiration of the expiring terms referred to above.

          (e)  Except as otherwise set forth herein or required by law, the
Certificate of Incorporation or the By-laws, the holders of Participating
Preferred Stock shall have no special voting rights and their consent shall not
be required (except to the extent they are entitled to vote with holders of
Common Stock as set forth herein) for the taking of any corporate action.  No
consent of the holders of outstanding shares of Participating Preferred Stock at
any time outstanding shall be required in order to permit the Board of Directors
to:  (i) increase the number of authorized shares of Participating Preferred
Stock or to decrease such number to a number not below the sum of the number of
shares of Participating Preferred Stock then outstanding and the number of
shares with respect to which there are outstanding rights to purchase; or (ii)
to issue Preferred Stock which is senior to the Participating Preferred Stock,
junior to the Participating Preferred Stock or on a parity with the
Participating Preferred Stock.

     5.   Consolidation, Merger, etc.  In case the Corporation shall enter into
          ---------------------------
any consolidation, merger, combination or other transaction in which the shares
of Common Stock are exchanged for or changed into other stock or securities,
cash and/or any other property, then in any such case each shares of
Participating Preferred Stock shall at the same time be similarly exchanged or
changed into an amount per share, subject to the provision for adjustment
hereinafter set forth, equal to 1,000 times the aggregate amount of stock,
securities, cash and/or any other property (payable in kind), as the case may
be, into which or for which each share of Common Stock is changed or exchanged.
In the event the Corporation shall at any time after the First Issuance declare
or pay any dividend on the Common Stock payable in shares of Common Stock, or
effect a subdivision or combination or consolidation of the outstanding shares
of Common Stock (by reclassification or otherwise then by payment of a dividend
in shares of Common Stock) into a greater or lesser number of shares of Common
Stock, then in each such

                                      A-5
<PAGE>

case the amount set forth in the preceding sentence which respect to the
exchange or change of shares of Participating Preferred Stock shall be adjusted
by multiplying such amount by a fraction, the numerator of which is the number
of shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

     6.   Redemption.  The shares of Participating Preferred Stock shall not be
          ----------
redeemable.

     7.   Conversion Rights.  The Participating Preferred Stock is not
          -----------------
convertible into Common Stock or any other security of the Corporation.

                  [balance of page intentionally left blank]

                                      A-6
<PAGE>

     IN WITNESS WHEREOF, the undersigned Corporate Vice President and Treasurer
and Corporate Vice President, Secretary and Associate General Counsel of the
Corporation each declares under penalty or perjury the truth, to the best of his
knowledge, of this Certificate of Designation, Preferences and Rights of Series
A Junior Participating Preferred Stock.

     Executed this ___ day of _______, 2001.

                                            By:_________________________________
                                               Name:  Albert F. Myers
                                               Title: Corporate Vice President
                                                      and Treasurer

Attest:

By: ___________________________________
    Name:  John H. Mullan
    Title:  Corporate Vice President,
            Secretary and Associate
            General Counsel

                                      A-7
<PAGE>

Preferred                                                              Exhibit B
                                                                       ---------

                           Form of Right Certificate

Certificate No. R-                                                   ____ Rights

     NOT EXERCISABLE AFTER OCTOBER 31, 2008, OR EARLIER IF REDEEMED BY THE
     CORPORATION.  THE RIGHTS ARE SUBJECT TO REDEMPTION AT $.01 PER RIGHT ON THE
     TERMS SET FORTH IN THE RIGHTS AGREEMENT.

                               Right Certificate

                                   NNG, 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 January 31, 2001 (the "Rights Agreement"), between NNG,
                                              ----------------
Inc., a Delaware corporation (the "Corporation"), and EquiServe Trust Company,
                                   -----------
N. A., a national association (the "Rights Agent"), to purchase from the
                                    ------------
Corporation at any time after the Distribution Date (as such term is defined in
the Rights Agreement) and prior to 5:00 P.M., New York time, on October 31,
2008, unless the Rights evidenced hereby shall have been previously redeemed by
the Corporation, at the office or offices of the Rights Agent designated for
such purpose, or at the office of its successor as Rights Agent, one one-
thousandth of a fully paid non-assessable share of Series A Junior Participating
Preferred Stock, without par value (the "Preferred Shares"), of the Corporation,
                                         ----------------
at a purchase price of $250.00 per one one-thousandth of Preferred Share (the
"Purchase Price"), upon presentation and surrender of this Right Certificate
---------------
with the Form of Election to Purchase duly executed.  The number of Rights
evidenced by this Right Certificate (and the number of one one-thousandths of a
Preferred Share which may be purchased upon exercise hereof) set forth above,
and the Purchase Price set forth above, are the number and Purchase Price as of
[____________, 20__,] based on the Preferred Shares 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 Right Certificate are
Beneficially Owned by (i) an Acquiring Person or an Affiliate or Associate of
any such Acquiring Person (as such terms are defined in the Rights Agreement),
(ii) a transferee of any such Acquiring Person, Associate or Affiliate who
becomes a transferee after the Acquiring Person becomes such, or (iii) under
certain circumstances specified in the Rights Agreement, a transferee of any
such Acquiring Person, Associate or Affiliate who becomes a transferee prior to
or concurrently with the Acquiring Person becoming such, 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 of
one one-thousandth of a Preferred Share or other securities which may be
purchased upon the exercise of the Rights evidenced by this Right Certificate
are subject to modification and adjustment upon

                                      B-1
<PAGE>

the happening of certain events, including Triggering Events (as such term is
defined in the Rights Agreement).

     This Right Certificate is subject to all of the terms, covenants and
restrictions of the Rights Agreement, which terms, covenants and restrictions
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 Corporation and the holders of the Right 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 on file at the principal executive offices of
the Corporation and the office or offices of the Rights Agent.

     This Right Certificate, with or without other Right Certificates, upon
surrender at the principal office of the Rights Agent, may be exchanged for
another Right Certificate or Right Certificates of like tenor and date
evidencing Rights entitling the holder to purchase a like aggregate number of
Preferred Shares or other securities as the Rights evidenced by the Right
Certificate or Right Certificates surrendered shall have entitled such holder to
purchase.  If this Right Certificate shall be exercised in part, the holder
shall be entitled to receive upon surrender hereof another Right Certificate or
Right 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 Corporation at a redemption price of
$.01 per Right (subject to adjustment as provided in the Rights Agreement)
payable in cash.

     No fractional Preferred Shares will be issued upon the exercise of any
Right or Rights evidenced hereby (other than fractions which are one one-
thousandth or integral multiples of one one-thousandth of a Preferred Share,
which may, at the election of the Corporation, be evidenced by depositary
receipts), but in lieu thereof a cash payment will be made, as provided in the
Rights Agreement.

     No holder of this Right Certificate shall be entitled to vote or receive
dividends or be deemed for any purpose the holder of the Preferred Shares or of
any other securities of the Corporation 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 Corporation 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 other distributions or to exercise
any preemptive or subscription rights, or otherwise, until the Right or Rights
evidenced by this Right Certificate shall have been exercised as provided in the
Rights Agreement.

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

                                      B-2
<PAGE>

     WITNESS the facsimile signature of the proper officers of the Corporation
and its corporate seal.  Dated as of [__________, 20__].

[SEAL]
ATTEST:                                     NNG, INC.

By: _________________________               By: ________________________________
    Name: ___________________                   Name: __________________________
    Title: __________________                   Title: _________________________

Countersigned:
[                       ]

By: _________________________
    Authorized Signatory
    Name: ___________________
    Title: __________________

                                      B-3
<PAGE>

                   Form of Reverse Side of Right Certificate

                              FORM OF ASSIGNMENT
                              ------------------

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

     FOR VALUE RECEIVED __________________________________ hereby sells, assigns
and transfers unto ____________________ (Please print name and address of
transferee) this Right Certificate, together with all right, title and interest
therein, and does hereby irrevocably constitute and appoint ______________
Attorney, to transfer the within Right Certificate on the books of the within-
named Corporation, with full power of substitution.

Dated:  ____________, 20__

                                       _________________________________________
                                       Signature

Signature Guaranteed:

     Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.

     The undersigned hereby certifies that (1) the Rights evidenced by this
Right Certificate are not being sold, assigned or transferred by or on behalf of
a Person who is or was an Acquiring Person or an Affiliate or Associate thereof
(as such terms are defined in the Right Agreement) and (2) after due inquiry and
to the best knowledge of the undersigned, the undersigned did not acquire the
Rights evidenced by this Right Certificate from any Person who is or was an
Acquiring Person or an Affiliate or Associate thereof (as such terms are defined
in the Rights Agreement).

                                       _________________________________________
                                       Signature

                                       1
<PAGE>

             Form of Reverse Side of Right Certificate--continued

                         FORM OF ELECTION TO PURCHASE
                         ----------------------------

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

To the Rights Agent:

     The undersigned hereby irrevocably elects to exercise _________________
Rights represented by this Right Certificate to purchase the Preferred Shares,
Common Shares or other securities issuable upon the exercise of such Rights and
requests that certificates for such Preferred Shares, Common Shares or other
securities be issued in the name of:

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 Right
Certificate, a new Right Certificate for the balance remaining 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:  _______________, 20__

                                       _________________________________________
                                       Signature

Signature Guaranteed:

     Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.

                                       2
<PAGE>

             Form of Reverse Side of Right Certificate--continued.

     The undersigned hereby certifies that (1) the Rights evidenced by this
Right Certificate are not being exercised by or on behalf of a Person who is or
was an Acquiring Person or an Affiliate or Associate thereof (as such terms are
defined in the Rights Agreement) and (2) after due inquiry and to the best
knowledge of the undersigned, the undersigned did not acquire the Rights
evidenced by this Rights Certificate from any Person who is or was an Acquiring
Person or an Affiliate or Associate thereof (as such terms are defined in the
Rights Agreement).

                                       _________________________________________
                                       Signature

                                       3
<PAGE>

                                    NOTICE
                                    ------

     The signature on the foregoing Forms of Assignment and Election and
certificates must conform to the name as written upon the face of this Right
Certificate in every particular, without alteration or enlargement or any change
whatsoever.

     In the event the certification set forth above in the Form of Assignment or
the Form of Election to Purchase, as the case may be, is not completed, the
Corporation and the Rights Agent will deem the Beneficial Owner of the Rights
evidenced by this Right Certificate to be an Acquiring Person or an Affiliate or
Associate thereof (as such terms are defined in the Rights Agreement) and such
Assignment or Election to Purchase will not be honored.

                                       4
<PAGE>

                                                                       Exhibit C
                                                                       ---------

                         SUMMARY OF RIGHTS TO PURCHASE
                               PREFERRED SHARES

     On January 31, 2001, the Board of Directors of NNG, Inc. (the
"Corporation") declared a dividend distribution of one preferred share purchase
 -----------
right (a "Right") for each outstanding share of Common Stock, par value $1.00
per share (the "Common Shares"), of the Corporation.  The dividend is payable to
                -------------
the stockholders of record on January 31, 2001 (the "Record Date"), and with
                                                     -----------
respect to Common Shares issued thereafter until the Distribution Date (as
defined below) and, in certain circumstances, with respect to Common Shares
issued after the Distribution Date.  Except as set forth below, each Right, when
it becomes exercisable, entitles the registered holder to purchase from the
Corporation one one-thousandth of a share of Series A Junior Participating
Preferred Stock, $1.00 par value per share (the "Preferred Shares"), of the
                                                 ----------------
Corporation at a price of $250.00 per one one-thousandth of a Preferred Share
(the "Purchase Price"), subject to adjustment.  The description and terms of the
      --------------
Rights are set forth in a Rights Agreement (the "Rights Agreement") between the
                                                 ----------------
Corporation and EquiServe Trust Company, N. A., as Rights Agent (the "Rights
                                                                      ------
Agent"), dated as of January 31, 2001.
-----

     Initially, the Rights will be attached to all certificates representing
Common Shares then outstanding, and no separate Right Certificates will be
distributed.  The Rights will separate from the Common Shares upon the earliest
to occur of (i) a person or group of affiliated or associated persons having
acquired beneficial ownership of 15% or more of the outstanding Common Shares
(except pursuant to a Permitted Offer, as hereinafter defined); or (ii) 10 days
(or such later date as the Board may determine) following the commencement of,
or announcement of an intention to make, a tender offer or exchange offer the
consummation of which would result in a person or group becoming an Acquiring
Person (as hereinafter defined) (the earliest of such dates being called the
"Distribution Date").  A person or group whose acquisition of Common Shares
------------------
causes a Distribution Date pursuant to clause (i) above is an "Acquiring
                                                               ---------
Person."  The date that a person or group becomes an Acquiring Person is the
"Shares Acquisition Date."
------------------------

     The Rights Agreement provides that, until the Distribution Date, the Rights
will be transferred with and only with the Common Shares.  Until the
Distribution Date (or earlier redemption or expiration of the Rights) new Common
Share certificates issued after the Record Date upon transfer or new issuance of
Common Shares will contain a notation incorporating the Rights Agreement by
reference.  Until the Distribution Date (or earlier redemption or expiration of
the Rights), the surrender for transfer of any certificates for Common Shares
outstanding as of the Record Date, even without such notation or a copy of this
Summary of Rights being attached thereto, will also constitute the transfer of
the Rights associated with the Common Shares represented by such certificate.
As soon as practicable following the Distribution Date, separate certificates
evidencing the Rights ("Right Certificates") will be mailed to holders of record
                        ------------------
of the Common Shares as of the close of business on the Distribution Date (and
to each initial record holder of certain Common Shares issued after the
Distribution Date), and such separate Right Certificates alone will evidence the
Rights.

                                      C-1
<PAGE>

     The Rights are not exercisable until the Distribution Date and will expire
at the close of business on October 31, 2008, unless earlier redeemed by the
Corporation as described below.

     In the event that any person becomes an Acquiring Person or an affiliate or
associate thereof, (except pursuant to a tender or exchange offer which is for
all outstanding Common Shares at a price and on terms which a majority of
certain members of the Board of Directors determines to be adequate and in the
best interests of the Corporation, its stockholders and other relevant
constituencies, other than such Acquiring Person, its affiliates and associates
(a "Permitted Offer")), each holder of a Right will thereafter have the right
    ---------------
(the "Flip-In Right") to receive upon exercise the number of Common Shares or of
      -------------
one one-thousandth of a share of Preferred Shares (or, in certain circumstances,
other securities of the Corporation) having a value (immediately prior to such
triggering event) equal to two times the exercise price of the Right.
Notwithstanding the foregoing, following the occurrence of the event described
above, all Rights that are, or (under certain circumstances specified in the
Rights Agreement) were, beneficially owned by any Acquiring Person or any
affiliate or associate thereof will be null and void.

     In the event that, at any time following the Shares Acquisition Date, (i)
the Corporation is acquired in a merger or other business combination
transaction in which the holders of all of the outstanding Common Shares
immediately prior to the consummation of the transaction are not the holders of
all of the surviving corporation's voting power, or (ii) more than 50% of the
Corporation's assets or earning power is sold or transferred, in either case
with or to an Acquiring Person or any affiliate or associate or any other person
in which such Acquiring Person, affiliate or associate has an interest or any
person acting on behalf of or in concert with such Acquiring Person, affiliate
or associate, or, if in such transaction all holders of Common Shares are not
treated alike, any other person, then each holder of a Right (except Rights
which previously have been voided as set forth above) shall thereafter have the
right (the "Flip-Over Right") to receive, upon exercise, common shares of the
            ---------------
acquiring company (or in certain circumstances, its parent) having a value equal
to two times the exercise price of the Right.  The holder of a Right will
continue to have the Flip-Over Right whether or not such holder exercises or
surrenders the Flip-In Right.

     The Purchase Price payable, and the number of Preferred Shares, Common
Shares or other securities 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
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or warrants to subscribe for or purchase Preferred Shares at a price, or
securities convertible into Preferred Shares with a conversion price, less than
the then current market price of the Preferred Shares or (iii) upon the
distribution to holders of the Preferred Shares of evidences of indebtedness or
assets (excluding regular quarterly cash dividends) or of subscription rights or
warrants (other than those referred to above).

     The number of outstanding Rights and the number of one one-thousandths of a
Preferred Share issuable upon exercise of each Right are also subject to
adjustment in the event of a stock split of the Common Shares or a stock
dividend on the Common Shares payable in Common Shares or subdivisions,
consolidations or combinations of the Common Shares occurring, in any such case,
prior to the Distribution Date.

                                      C-2
<PAGE>

     Preferred Shares purchasable upon exercise of the Rights will not be
redeemable.  Each Preferred Share will be entitled to a minimum preferential
quarterly dividend payment of $10.00 per share but, if greater, will be entitled
to an aggregate dividend per share of 1,000 times the dividend declared per
Common Share.  In the event of liquidation, the holders of the Preferred Shares
will be entitled to a minimum preferential liquidation payment of $1,000 per
share; provided, however, that the holders will be entitled to an aggregate
       --------  -------
payment per share of at least 1,000 times the aggregate payment made per Common
Share.  These rights are protected by customary anti-dilution provisions.  In
the event that the amount of accrued and unpaid dividends on the Preferred
Shares is equivalent to six full quarterly dividends or more, the holders of the
Preferred Shares shall have the right, voting as a class, to elect two directors
in addition to the directors elected by the holders of the Common Shares, until
all cumulative dividends on the Preferred Shares have been paid through the last
quarterly dividend payment date or until non-cumulative dividends have been paid
regularly for at least one year.

     With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price.  No fractional Preferred Shares will be issued (other than
fractions which are one one-thousandth or integral multiples of one one-
thousandth of a Preferred Share, which may, at the election of the Corporation,
be evidenced by depositary receipts) and in lieu thereof, an adjustment in cash
will be made based on the market price of the Preferred Shares on the last
trading day prior to the date of exercise.

     At any time prior to the earlier to occur of (i) a person becoming an
Acquiring Person or (ii) the expiration of the Rights, and under certain other
circumstances, the Corporation may redeem the Rights in whole, but not in part,
at a price of $.01 per Right (the "Redemption Price") which redemption shall be
effective upon the action of the Board of Directors.  Additionally, following
the Shares Acquisition Date, the Corporation may redeem the then outstanding
Rights in whole, but not in part, at the Redemption Price; provided, however,
                                                           --------  -------
that such redemption is in connection with a merger or other business
combination transaction or series of transactions involving the Corporation in
which all holders of Common Shares are treated alike but not involving an
Acquiring Person or its affiliates or associates.

     All of the provisions of the Rights Agreement may be amended by the Board
of Directors of the Corporation 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, defect or inconsistency, to make changes
which do not adversely affect the interests of holders of Rights (excluding the
interests of any Acquiring Person), or, subject to certain limitations, to
shorten or lengthen any time period under the Rights Agreement.

     Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Corporation, including, without limitation, the
right to vote or to receive dividends.  While the distribution of the Rights
will not be taxable to stockholders of the Corporation, stockholders may,
depending upon the circumstances, recognize taxable income should the Rights
become exercisable or upon the occurrence of certain events thereafter.

     A copy of the Rights Agreement has been filed with the Securities and
Exchange Commission as an Exhibit to a Registration Statement on Form 8-A dated
March [__], 2001.  A

                                      C-3
<PAGE>

copy of the Rights Agreement is available free of charge from the Corporation.
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 hereby
incorporated herein by reference.

                                      C-4

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