ENTERPRISE BANCORP INC /MA/
8-A12G, 1998-01-14
STATE COMMERCIAL BANKS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-A

                For Registration of Certain Classes of Securities
                    Pursuant to Section 12(b) or 12(g) of the
                         Securities Exchange Act of 1934

                            ENTERPRISE BANCORP, INC.
             (Exact Name of Registrant as Specified in its Charter)



                Massachusetts                           04-3308902
       (State or Other Jurisdiction           (IRS Employer Identification No.)
             of Incorporation)

             222 Merrimack Street                         01852
            Lowell, Massachusetts                      (Zip Code)
        (Address of principal office)

If  this   Form   relates   to  the         If  this   Form   relates   to  the
registration  of a  class  of  debt         registration  of a  class  of  debt
securities  and is  effective  upon         securities   and   is   to   become
filing    pursuant    to    General         effective  simultaneously  with the
Instruction  A(c)(1),  please check         effectiveness   of   a   concurrent
the following box.|_|                       registration  statement  under  the
                                            Securities  Act of 1933 pursuant to
                                            General Instruction A(c)(2), please
                                            check the following box.|_|        


        Securities to be registered pursuant to Section 12(b) of the Act:


          Title of Each Class               Name of Each Exchange on Which
          to be so Registered               Each Class is to be Registered

                 None

        Securities to be registered pursuant to Section 12(g) of the Act:

                         Preferred Share Purchase Rights
                                (Title of Class)




<PAGE>


                                       -2-

Item 1.  Description of Registrant's Securities to be Registered.

         On January 13, 1998, the Board of Directors of Enterprise Bancorp, Inc.
(the  "Company"),  declared  a  dividend  distribution  of one  Preferred  Share
Purchase  Right (a  "Right")  for each of the  Company's  outstanding  shares of
common  stock,  par value $.01 per share (the  "Common  Shares"),  to holders of
record of the Common  Shares at the close of business on January 20, 1998.  Each
Right  entitles  the  registered   holder  to  purchase  from  the  Company  one
one-hundredth  of a share of preferred  stock,  par value $.01 per share, of the
Company (the "Preferred Shares") or in certain  circumstances,  to receive cash,
property,  Common Shares or other securities of the Company, at a Purchase Price
of $75.00 per one one-hundredth of a Preferred Share, subject to adjustment. The
description  and terms of the  Rights are set forth in a Rights  Agreement  (the
"Rights  Agreement")  between the Company and Enterprise Bank and Trust Company,
as Rights Agent.

         Initially, the Rights will be attached to all certificates representing
the Common Shares and no separate Rights  Certificates will be distributed.  The
Rights will separate from the Common Shares and a  Distribution  Date will occur
upon the  earlier of (i) 10 business  days (or such later date as the  Company's
Board of Directors may determine before a Distribution  Date occurs) following a
public  announcement  by the  Company  that a person or group of  affiliated  or
associated  persons,  with  certain  exceptions  (an  "Acquiring  Person"),  has
acquired,  or has obtained the right to acquire  beneficial  ownership of 10% or
more of the outstanding  Common Shares (the date of such announcement  being the
"Share  Acquisition  Date") or (ii) 10 business  days (or such later date as the
Company's  Board of Directors may determine  before a Distribution  Date occurs)
following the commencement of a tender offer or exchange offer that would result
in a person becoming an Acquiring Person.

         Until the  Distribution  Date,  (i) the Rights will be evidenced by the
certificates  for Common Shares and will be transferred  with and only with such
Common  Share  certificates,  (ii)  Common  Share  certificates  will  contain a
notation incorporating the Rights Agreement by reference and (iii) the surrender
for  transfer  of any  certificates  for  Common  Shares  outstanding  will also
constitute  the  transfer  of the  Rights  associated  with  the  Common  Shares
represented by such certificates.

         The Rights are not  exercisable  until the  Distribution  Date and will
expire at the close of business on January 13, 2008,  unless earlier redeemed or
exchanged by the Company as described below.

         As soon as practicable after the Distribution Date, Rights Certificates
will be mailed to  holders  of  record of the  Common  Shares as of the close of
business on the Distribution Date and, from and after the Distribution Date, the
separate Rights Certificates alone will represent the Rights.

         In the event (a "Flip-In  Event") a Person becomes an Acquiring  Person
(except pursuant to a tender or exchange offer for all outstanding Common Shares
at a price and on terms which a majority of the Company's  Outside Directors (as
defined in the Rights  Agreement)  determines to be fair to and otherwise in the
best  interests  of the Company and its  shareholders  (a "fair  offer")),  each
holder of a Right will  thereafter  have the right to receive,  upon exercise of
such Right, Common Shares (or, in certain circumstances, cash, property or other
securities  of the  Company)  having a Current  Market  Price (as defined in the
Rights  Agreement)  equal  to  two  times  the  exercise  price  of  the  Right.
Notwithstanding the foregoing, following the occurrence of any Flip-In Event,


<PAGE>


                                       -3-

all Rights that are, or (under  certain  circumstances  specified  in the Rights
Agreement)  were,  beneficially  owned by any  Acquiring  Person  (or by certain
related  parties)  will be null and void in the  circumstances  set forth in the
Rights  Agreement.  However,  Rights  will  not  be  exercisable  following  the
occurrence  of any  Flip-In  Event  until  such time as the Rights are no longer
redeemable by the Company as set forth below.

         For example,  at an exercise price of $75.00 per Right,  each Right not
owned by an Acquiring Person (or by certain related parties) following a Flip-In
Event would  entitle its holder to purchase  $150.00  worth of Common Shares (or
other consideration, as noted above) for $75.00. Assuming that the Common Shares
had a Current  Market  Price of $25.00 at such  time,  the  holder of each valid
Right would be entitled to purchase six (6) Common Shares for $75.00.

         In the event (a  "Flip-Over  Event")  that, at any time on or after the
Share  Acquisition  Date,  (i) the Company  shall take part in a merger or other
business combination  transaction (other than certain mergers that follow a fair
offer) and the  Company  shall not be the  surviving  entity or (ii) the Company
shall take part in a merger or other business  combination  transaction in which
the Common  Shares are changed or  exchanged  (other than  certain  mergers that
follow a fair  offer) or (iii) 50% or more of the  Company's  assets or  earning
power is sold or  transferred,  each  holder  of a Right  (except  Rights  which
previously have been voided, as set forth above) shall thereafter have the right
to receive,  upon exercise,  a number of shares of common stock of the acquiring
company  having a Current  Market Price equal to two times the exercise price of
the Right.

         The Purchase  Price payable and the number of Preferred  Shares (or the
amount of cash,  property 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  share   dividend  on,  or  a   subdivision,   combination  or
reclassification  of, the  Preferred  Shares,  (ii) if holders of the  Preferred
Shares are granted certain rights or warrants to subscribe for Preferred  Shares
or securities  convertible into Preferred Shares at less than the 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).

         With certain  exceptions,  no adjustment in the Purchase  Price will be
required  until  cumulative  adjustments  amount to at least 1% of the  Purchase
Price. The Company is not required to issue fractional Preferred Shares upon the
exercise of any Right or Rights. In lieu thereof, a cash payment may be made, as
provided in the Rights Agreement.

         At any time until 10  business  days  following  the Share  Acquisition
Date, the Company may redeem the Rights in whole, but not in part, at a price of
$.01 per Right, payable, at the option of the Company, in cash, Common Shares or
other  consideration  as the Board of Directors may determine.  Immediately upon
the  effectiveness  of the action of the Company's  Board of Directors  ordering
redemption  of the Rights,  the Rights will  terminate and the only right of the
holders of Rights will be to receive the $.01 per Right redemption price.

         Until a Right is exercised,  the holder thereof,  as such, will have no
rights as a shareholder of the Company, including, without limitation, the right
to vote or to receive  dividends.  While the distribution of the Rights will not
be taxable to shareholders or to the Company, shareholders may,


<PAGE>


                                       -4-

depending upon the  circumstances,  recognize taxable income upon the occurrence
of either a Flip-In Event or a Flip-over Event as described above.

         The terms of the Rights, other than key financial terms and the date on
which the Rights expire, may be amended by the Board of Directors of the Company
prior  to the  Distribution  Date.  Thereafter,  the  provisions  of the  Rights
Agreement  may be  amended by the Board of  Directors  only 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 and certain other  related  parties) or to shorten or lengthen
any time period under the Rights Agreement; provided, however, that no amendment
to lengthen the time period  governing  redemption shall be made at such time as
the Rights are not redeemable.

         This summary  description of the Rights does not purport to be complete
and is qualified in its entirety by referenced to the Rights  Agreement filed as
Exhibit  4.1  hereto.  Capitalized  terms used and not  defined  herein have the
meanings set forth in the Rights Agreement.

Item 2.  Exhibits.

         The  following  exhibits  are  filed  as a part  of  this  Registration
Statement.

Exhibit Number             Description

         4.1      Rights  Agreement  dated  as  of  January 13, 1998  between
                  Enterprise  Bancorp,  Inc.  and  Enterprise  Bank  and  Trust
                  Company, as Rights Agent.

         4.2      Terms  of  Series  A  Junior  Participating  Preferred  Stock,
                  included as Exhibit A to Rights Agreement.

         4.3      Summary  of  Rights  to  Purchase  Shares  of  Series A Junior
                  Participating Preferred Stock, included as Exhibit B to Rights
                  Agreement.

         4.4      Form of Rights  Certificate,  included  as Exhibit C to Rights
                  Agreement.




<PAGE>


                                       -5-


                                   Signatures

         Pursuant to the  requirements of Section 12 of the Securities  Exchange
Act of 1934, the Registrant has caused this registration  statement to be signed
on its behalf by the undersigned, thereunto duly authorized.



                                   ENTERPRISE BANCORP, INC.



Date: January 14, 1998             By: /s/ Richard W. Main
                                         Richard W. Main
                                         President and Chief Operating Officer






                                                                     EXHIBIT 4.1

                                RIGHTS AGREEMENT


         RIGHTS  AGREEMENT,  dated as of January 13,  1998,  between  Enterprise
Bancorp, Inc., a Massachusetts corporation (the "Company"),  and Enterprise Bank
and Trust Company, a Massachusetts trust company (the "Rights Agent").

                               W I T N E S S E T H

         WHEREAS, on January 13, 1998 (the "Rights Dividend  Declaration Date"),
the Board of  Directors  of the  Company  authorized  and  declared  a  dividend
distribution  of one Right (as  hereinafter  defined)  for each  share of Common
Stock  (as  hereinafter  defined)  of the  Company  outstanding  at the Close of
Business (as hereinafter  defined) on January 20, 1998 (the "Record Date"),  and
authorized the issuance of one Right (as such number may hereinafter be adjusted
pursuant to the  provisions  of Section  11(i)  hereof) for each share of Common
Stock of the Company issued between the Record Date (whether  originally  issued
or  delivered  from  the  Company's  treasury)  and the  Distribution  Date  (as
hereinafter  defined) and under  certain  circumstances  thereafter,  each Right
initially  representing  the right to purchase one  one-hundredth  of a share of
Preferred  Stock (as  hereinafter  defined) of the  Company,  upon the terms and
subject to the conditions hereinafter set forth (the "Rights");

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

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

         "Acquiring  Person"  shall mean any Person who or which,  together with
all Affiliates and Associates of such Person,  shall be the Beneficial  Owner of
10% or more of the shares of Common Stock of the Company then  outstanding,  but
shall not include an Exempt Person.

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

         "Adjustment  Shares"  shall  have the  meaning  set  forth  in  Section
11(a)(ii) hereof.

         "Affiliate" and "Associate" shall have the respective meanings ascribed
to such  terms in Rule  12b-2 of the  General  Rules and  Regulations  under the
Exchange Act.

         "Agreement" means this Rights Agreement as originally executed or as it
may from time to time be  supplemented  or amended  pursuant  to the  applicable
provisions hereof.

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


<PAGE>


                                       -2-

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

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

                  (iii) which are beneficially owned, directly or indirectly, by
         any other Person (or any  Affiliate or  Associate  thereof)  with which
         such Person (or any of such Person's  Affiliates or Associates) has any
         agreement,  arrangement or  understanding  (whether or not in writing),
         for the purpose of acquiring,  holding,  voting  (except  pursuant to a
         revocable   proxy  as  described  in  clause  (A)  of  the  proviso  to
         subparagraph  (ii) of this  paragraph  (f)) or  disposing of any voting
         securities  of the  Company;  provided,  however,  that nothing in this
         paragraph  (f)  shall  cause  a  person   engaged  in  business  as  an
         underwriter  of  securities  to be the  "Beneficial  Owner"  of,  or to
         "beneficially  own," any  securities  acquired  through  such  person's
         participation in good faith in a firm commitment underwriting until the
         expiration of forty days after the date of such acquisition.

         "Board" means the Board of Directors of the Company.

         "Business  Day" shall mean any day other than a  Saturday,  Sunday or a
day on which banking institutions in the states in which either the Rights Agent
or the Transfer Agent is located are authorized or obligated by law or executive
order to close.



<PAGE>


                                       -3-

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

         "Common  Stock" when used with  reference to the Company shall mean the
shares of common  stock,  par value $.01 per share,  of the Company or any other
shares  of  capital  stock  of the  Company  into  which  such  stock  shall  be
reclassified  or changed.  "Common Stock" when used with reference to any Person
which shall be organized in corporate form,  other than the Company,  shall mean
the capital stock or other equity security with the greatest voting power or the
equity securities or other equity interest having power to control or direct the
management of such Person or, if such Person is a Subsidiary of another  Person,
the Person or Persons which ultimately control such  first-mentioned  Person and
which has or have issued any such outstanding  capital stock,  equity securities
or equity interest.  "Common Stock" when used with reference to any Person which
shall not be organized in corporate form shall mean units of beneficial interest
which (i) shall represent the right to participate  generally in the profits and
losses of such Person  (including,  without  limitation,  any  flow-through  tax
benefits  resulting from an ownership interest in such Person) and (ii) shall be
entitled to exercise the greatest voting power of such Person or, in the case of
a limited  partnership,  shall have the power to remove the  general  partner or
partners.

         "Common Stock  Equivalents" shall have the meaning set forth in Section
11(a)(iii) hereof.

         "Company"  shall mean the Person  named as the  "Company"  in the first
paragraph  of this  Agreement  until a successor  corporation  shall have become
such, or until a Principal Party shall assume, and thereafter be liable for, all
obligations  and duties of the  Company  hereunder  pursuant  to the  applicable
provisions of this Agreement, and thereafter "Company" shall mean such successor
corporation or Principal Party.

         "Continuing  Director"  shall mean any member of the Board  (while such
Person is a member of the Board) who is not an Acquiring Person, or an Affiliate
or  Associate  of an  Acquiring  Person,  or a  representative  or nominee of an
Acquiring Person or of any such Affiliate or Associate, and who either (i) was a
member of the Board prior to the Stock Acquisition Date or (ii) on or subsequent
to the Stock  Acquisition Date became a member of the Board and whose nomination
for election or election to the Board was  recommended or approved by a majority
of the Continuing Director then on the Board.

         "Current  Market  Price"  shall have the  meaning  set forth in Section
11(d) hereof.

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

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

         "Equivalent  Preferred  Stock"  shall  have the  meaning  set  forth in
Section 11(b) hereof.

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


<PAGE>


                                       -4-

         "Exchange  Ratio"  shall have the  meaning  set forth in Section  29(a)
hereof.

         "Exempt Person" shall mean (i) the Company,  (ii) any Subsidiary of the
Company,  (iii) any employee benefit or employee stock plan of the Company or of
any Subsidiary of the Company,  (iv) any Person or entity organized,  appointed,
established  or holding  Common  Stock of the Company by, for or pursuant to the
terms of any such plan, (v) any Person who becomes an Acquiring Person solely as
a result of a reduction  in the number of shares of Common  Stock of the Company
outstanding  due to the  repurchase  of shares of Common Stock of the Company by
the Company, unless and until any such Person shall purchase or otherwise become
the  Beneficial  Owner of  additional  shares  of  Common  Stock of the  Company
constituting  1% or more of the then  outstanding  shares of Common Stock of the
Company, or (vi) any Person who or which shall have executed a written agreement
with the Company  (which  shall have been  approved by a majority of the Outside
Directors) prior to the date on which such Person became the Beneficial Owner of
10% or more of the shares of Common  Stock  then  outstanding,  which  agreement
imposes  one or  more  limitations  (the  "Thresholds")  on the  amount  of such
Person's  Beneficial  Ownership of shares of Common Stock, if and so long as the
Thresholds  continue  to be  binding  on  such  Person  and  such  Person  is in
substantial  compliance (as  determined by a majority of the Outside  Directors)
with the terms of such written agreement.

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

         "Final  Expiration  Date"  shall mean the Close of Business on January
13, 2008.

         "Original  Rights" shall mean Rights  acquired by such Person or any of
such  Person's  Affiliates  or  Associates  prior  to the  Distribution  Date or
pursuant to Section 3(a) or Section 22 hereof.

         "Outside  Directors"  shall  mean  members  of the  Board  who  are not
officers of the  Company or any of its  Subsidiaries  and who are not  Acquiring
Persons or  representatives,  nominees,  Affiliates  or  Associates of Acquiring
Persons.

         "Person" shall mean any  individual,  firm,  corporation,  partnership,
trust or other entity and includes,  without limitation, an unincorporated group
of persons  who,  by formal or  informal  agreement,  have  embarked on a common
purpose or act.

         "Preferred  Stock"  shall  mean  the  Series  A  Junior   Participating
Preferred  Stock,  par value $.01 per share, of the Company,  having the rights,
powers and preferences as set forth on Exhibit A hereto.

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

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



<PAGE>


                                       -5-

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

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

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

         "Rights Agent" shall mean the Person named as the "Rights Agent" in the
first  paragraph  of this  Agreement  until a successor  Rights Agent shall have
become such  pursuant  to the  applicable  provisions  hereof,  and  thereafter,
"Rights Agent" shall mean such successor  Rights Agent.  If at any time there is
more than one Person  appointed by the Company as Rights  Agent  pursuant to the
applicable  provisions of this Agreement,  "Rights Agent" shall mean and include
each such Person.

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

         "Rights Dividend  Declaration Date" shall have the meaning set forth in
the WHEREAS clause at the beginning of the Agreement.

         "Section  11(a)(ii)  Event" shall have the meaning set forth in Section
11(a)(ii) hereof.

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

         "Section 13 Event"  shall have the  meaning set forth in Section  13(a)
hereof.

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

         "Stock   Acquisition   Date"  shall  mean  the  first  date  of  public
announcement by the Company that an Acquiring Person has become such.

         "Subsidiary"  shall mean, with reference to any Person, any corporation
or other entity of which securities or other ownership  interest having ordinary
voting power sufficient, in the absence of contingencies, to elect a majority of
the board of directors or other persons  performing similar functions are at the
time directly or indirectly beneficially owned, or otherwise controlled, by such
Person and any Affiliate of such Person.

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

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

         "Thresholds"  shall have the  meaning  set forth in  Section  11(d)(ii)
hereof.

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



<PAGE>


                                       -6-

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

         Section 2. Appointment of Rights Agent. The Company hereby appoints the
Rights  Agent to act as agent for the Company in  accordance  with the terms and
conditions  hereof,  and the Rights Agent hereby accepts such  appointment.  The
Company  may from time to time  appoint  such Co-  Rights  Agents as it may deem
necessary  or  desirable.  Any  actions  which may be taken by the Rights  Agent
pursuant  to the  terms of this  Agreement  may be  taken by any such  Co-Rights
Agent.

         Section 3.  Issue of Rights Certificates.

         (a)  Until  the  earlier  of (i) the  Close of  Business  on the  tenth
Business Day (or such  specified  later date as may be  determined  by the Board
with the  concurrence  of a  majority  of the  Continuing  Directors  before the
occurrence of the  Distribution  Date) after the Stock  Acquisition Date (or, if
the tenth Business Day after the Stock Acquisition Date occurs before the Record
Date, the Close of Business on the Record Date) or (ii) the Close of Business on
the tenth Business Day (or such  specified or  unspecified  later date as may be
determined  by the Board with the  concurrence  of a majority of the  Continuing
Directors before the occurrence of the Distribution  Date) after the date that a
tender or exchange  offer by any Person  (other than an Exempt  Person) is first
published  or sent or given  within the meaning of Rule  14d-2(a) of the General
Rules and Regulations under the Exchange Act, if upon consummation thereof, such
Person  would be an  Acquiring  Person (the earlier of (i) and (ii) being herein
referred  to as the  "Distribution  Date"),  (x) the  Rights  will be  evidenced
(subject to the  provisions of paragraphs  (b) and (c) of this Section 3) by the
certificates for the Common Stock of the Company  registered in the names of the
holders of the Common Stock of the Company  either with the Summary of Rights to
Purchase Preferred Stock, substantially in the form attached hereto as Exhibit B
(the  "Summary of Rights"),  attached or bearing the legend set forth in Section
3(c) hereof (which  certificates for Common Stock of the Company shall be deemed
also to be certificates for Rights) and not by separate certificates and (y) the
Rights  will be  transferable  only  in  connection  with  the  transfer  of the
underlying  shares of Common  Stock of the Company  (including a transfer to the
Company).  As soon as practicable after the Distribution  Date, the Rights Agent
will send by first-class,  insured,  postage prepaid mail, to each record holder
of the  Common  Stock  of  the  Company  as of  the  Close  of  Business  on the
Distribution  Date,  at the address of such  holder  shown on the records of the
Company,  one or more rights certificates in substantially the form of Exhibit C
hereto (the "Rights Certificates") evidencing one Right for each share of Common
Stock of the Company so held,  subject to adjustment as provided herein.  In the
event that an  adjustment  in the number of Rights per share of Common  Stock of
the  Company  has been made  pursuant to Section  11(i)  hereof,  at the time of
distribution  of the Rights  Certificates,  the Company shall make the necessary
and appropriate  rounding  adjustments (in accordance with Section 14(a) hereof)
so that  Rights  Certificates  representing  only  whole  numbers  of Rights are
distributed and cash is paid in lieu of any fractional  Rights.  As of and after
the  Distribution  Date,  the Rights  will be  evidenced  solely by such  Rights
Certificates.

         (b) As promptly as  practicable  following the Record Date, the Company
will send a copy of the Summary of Rights by first-class,  postage prepaid mail,
to each  record  holder of the  Common  Stock of the  Company as of the Close of
Business on the Record Date, at the address of such holder


<PAGE>


                                       -7-

shown on the records of the Company. With respect to certificates for the Common
Stock of the Company  outstanding as of the Record Date, as set forth in Section
3(a) above,  until the earlier of the Distribution  Date or the Expiration Date,
the Rights will be  evidenced by such  certificates  for the Common Stock of the
Company  with or  without  a copy of the  Summary  of Rights  attached,  and the
registered  holders  of the  Common  Stock  of the  Company  shall  also  be the
registered  holders  of  the  associated  Rights.   Until  the  earlier  of  the
Distribution  Date or the  Expiration  Date,  the  transfer of any  certificates
representing  shares of Common  Stock of the Company in respect of which  Rights
have been issued shall also  constitute  the  transfer of the Rights  associated
with such shares of Common Stock of the Company.

         (c) Rights  shall be issued in respect of all shares of Common Stock of
the Company which are issued  (whether  originally  issued or from the Company's
treasury)  after the Record  Date but prior to the  earlier of the  Distribution
Date or the Expiration Date, and to the extent provided in Section 22 hereof, in
respect of shares of Common Stock of the Company  issued after the  Distribution
Date and prior to the Expiration Date. Certificates  representing such shares of
Common Stock of the Company shall also be deemed to be certificates  for Rights,
and shall, as promptly as practicable  following the Record Date, bear a legend,
substantially in the form of the following:

         This  certificate  also  evidences  and entitles the holder
         hereof  to  certain  Rights  as set  forth  in  the  Rights
         Agreement between Enterprise Bancorp,  Inc. (the "Company")
         and Enterprise  Bank and Trust Company (the "Rights Agent")
         dated as of January 13, 1998 (the "Rights Agreement"), the
         terms of which are hereby  incorporated herein by reference
         and a copy of which is on file at the principal  offices of
         the Company. Under certain  circumstances,  as set forth in
         the Rights  Agreement,  such  Rights will be  evidenced  by
         separate  certificates  and will no longer be  evidenced by
         this  certificate.  The Company  will mail to the holder of
         this  certificate  a copy of the  Rights  Agreement,  as in
         effect  on the date of  mailing,  without  charge  promptly
         after receipt of a written request therefor.  Under certain
         circumstances  set forth in the  Rights  Agreement,  Rights
         beneficially  owned (as such term is  defined in the Rights
         Agreement)  by,  any  Person  who  is,  was or  becomes  an
         Acquiring Person, or any Affiliate or Associate thereof (as
         such terms are  defined in the Rights  Agreement),  whether
         currently  held by or on  behalf  of such  Person or by any
         subsequent  holder,  may become  null and void.  The Rights
         shall  not be  exercisable,  and  shall  be void so long as
         held, by a holder in any  jurisdiction  where the requisite
         qualification  to  the  issuance  to  such  holder,  or the
         exercise by such holder, of the Rights in such jurisdiction
         shall not have been obtained or be obtainable.

         With respect to such  certificates  containing  the  foregoing  legend,
until the earlier of the  Distribution  Date or the Expiration  Date, the Rights
associated with the Common Stock of the Company represented by such certificates
shall be evidenced by such certificates alone, and


<PAGE>


                                       -8-

registered  holders of Common Stock of the Company shall also be the  registered
holders of the associated  Rights,  and the transfer of any of such certificates
shall also  constitute  the  transfer of the Rights  associated  with the Common
Stock of the Company represented by such certificates.

         Section 4.  Form of Rights Certificates.

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

         (b) Any Rights  Certificate  issued pursuant to Section 3(a) or Section
22 hereof that represents Rights  beneficially  owned by (i) an Acquiring Person
or any  Associate or Affiliate of an Acquiring  Person,  (ii) a transferee of an
Acquiring  Person  (or of  any  such  Associate  or  Affiliate)  who  becomes  a
transferee  after the Acquiring  Person becomes such or (iii) a transferee of an
Acquiring  Person  (or of  any  such  Associate  or  Affiliate)  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 such  Acquiring  Person  has any
continuing  agreement,  arrangement or  understanding  regarding the transferred
Rights or (B) a  transfer  which a  majority  of the  Continuing  Directors  has
determined  is part of a  plan,  arrangement  or  understanding  which  has as a
primary  purpose or effect  avoidance  of Section  7(e)  hereof,  and any Rights
Certificate  issued  pursuant to Section 6 or Section 11 hereof  upon  transfer,
exchange,  replacement or adjustment of any other Rights Certificate referred to
in this sentence, shall contain (to the extent feasible) a legend, substantially
in the form of the following:

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



<PAGE>


                                       -9-

         Section 5.  Countersignature and Registration.

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

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

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

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


<PAGE>


                                      -10-

request. Thereupon the Rights Agent shall, subject to Section 4(b), Section 7(e)
and Section 14 hereof,  countersign and deliver to the Person entitled thereto a
Rights Certificate or Rights Certificates,  as the case may be, as so requested.
The  Company  may  require  payment  of a sum  sufficient  to  cover  any tax or
governmental  charge that may be imposed in connection with any transfer,  split
up, combination or exchange of Rights Certificates.

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

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

         (a) Subject to Section 7(e) hereof, the registered holder of any Rights
Certificate  may  exercise  the Rights  evidenced  thereby  (except as otherwise
provided   herein   including,   without   limitation,   the   restrictions   on
exercisability  set forth in Section 9(c),  Section 11(a)(iii) and Section 23(a)
hereof)  in  whole or in part at any  time  after  the  Distribution  Date  upon
surrender of the Rights  Certificate,  with the form of election to purchase and
the  certificate on the reverse side thereof duly executed,  to the Rights Agent
at the  principal  office or  offices of the Rights  Agent  designated  for such
purpose,  together with payment of the aggregate  Purchase Price with respect to
the total number of one one-hundredths of a share (or other securities,  cash or
other assets,  as the case may be) as to which such surrendered  Rights are then
exercisable,  at or prior to the earliest of (i) the Final Expiration Date, (ii)
the time at which the Rights are  redeemed  as  provided in Section 23 hereof or
exchanged as provided in Section 29 hereof or (iii) the time at which the Rights
expire  pursuant to Section  13(d) hereof (the  earliest of (i),  (ii) and (iii)
being herein referred to as the "Expiration Date").

         (b) The  Purchase  Price  for  each  one  one-hundredth  of a share  of
Preferred  Stock  pursuant to the exercise of a Right shall  initially be $75.00
and shall be subject to adjustment  from time to time as provided in Sections 11
and 13(a) hereof and shall be payable in accordance with Section 7(c) below.

         (c) Upon  receipt  of a  Rights  Certificate  representing  exercisable
Rights, with the form of election to purchase and the certificate on the reverse
side of the Rights  Certificate  duly  executed,  accompanied  by payment,  with
respect to each Right so exercised, of the Purchase Price, as such amount may be
reduced pursuant to Section  11(a)(iii) hereof, per one one-hundredth of a share
of Preferred Stock (or other shares,  securities,  cash or other assets,  as the
case may be) to be  purchased  as set forth  below  and an  amount  equal to any
applicable  transfer  tax, the Rights Agent shall,  subject to Sections 7(f) and
20(k) hereof,  thereupon promptly (i) (A) requisition from any transfer agent of
the shares of  Preferred  Stock (or make  available,  if the Rights Agent is the
transfer agent for such


<PAGE>


                                      -11-

shares)  certificates for the total number of one  one-hundredths  of a share of
Preferred  Stock to be purchased and the Company hereby  irrevocably  authorizes
its transfer agent to comply with all such requests, or (B) if the Company shall
have elected to deposit the total number of shares of Preferred  Stock  issuable
upon exercise of the Rights hereunder with a depositary agent,  requisition from
the  depositary  agent  depositary  receipts  representing  such  number  of one
one-hundredths  of a share of Preferred  Stock as are to be purchased  (in which
case certificates for the shares of Preferred Stock represented by such receipts
shall be  deposited  by the transfer  agent with the  depositary  agent) and the
Company  will  direct the  depositary  agent to comply with such  request,  (ii)
requisition  from the Company the amount of cash,  if any, to be paid in lieu of
fractional  shares in accordance with Section 14 hereof,  (iii) after receipt of
such certificates or depositary  receipts,  cause the same to be delivered to or
upon the order of the registered holder of such Rights  Certificate,  registered
in such  name or names  as may be  designated  by such  holder,  and (iv)  after
receipt  thereof,  deliver  such  cash,  if any,  to or upon  the  order  of the
registered holder of such Rights Certificate.  The payment of the Purchase Price
(as such amount may be reduced pursuant to Section  11(a)(iii)  hereof) shall be
made in cash or by certified check, cashier's check or bank draft payable to the
order of the Company.  In the event that the Company is obligated to issue other
securities  (including Common Stock) of the Company,  pay cash and/or distribute
other  property  pursuant to Section  11(a)  hereof,  the Company  will make all
arrangements necessary so that such other securities, cash and/or other property
are available for distribution by the Rights Agent, if and when appropriate. The
Company  reserves the right to require  prior to the  occurrence of a Triggering
Event that, upon any exercise of Rights, a number of Rights be exercised so that
only whole shares of Preferred Stock would be issued.

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

         (e)  Notwithstanding  anything in this Agreement to the contrary,  from
and  after  the  first  occurrence  of a Section  11(a)(ii)  Event,  any  Rights
beneficially owned by (i) an Acquiring Person or an Associate or Affiliate of an
Acquiring  Person  which a  majority  of the  Continuing  Directors  in its sole
discretion  determines is or was involved in or caused or facilitated,  directly
or  indirectly,  such Section  11(a)(ii)  Event,  (ii) a transferee  of any such
Acquiring  Person  (or of  any  such  Associate  or  Affiliate)  who  becomes  a
transferee after such Acquiring Person becomes such or (iii) a transferee of any
such  Acquiring  Person (or of any such  Associate or  Affiliate)  who becomes a
transferee prior to or concurrently with such Acquiring Person becoming such and
receives  such  Rights  pursuant  to either (A) a transfer  (whether  or not for
consideration) from such Acquiring Person to holders of equity interests in such
Acquiring  Person  or to any  Person  with whom such  Acquiring  Person  has any
continuing  agreement,  arrangement or  understanding  regarding the transferred
Rights or (B) a  transfer  which a  majority  of the  Continuing  Directors  has
determined  is part of a  plan,  arrangement  or  understanding  which  has as a
primary purpose or effect the avoidance of this Section 7(e),  shall become null
and void without any further  action and no holder of such Rights shall have any
rights  whatsoever  with respect to such Rights,  whether under any provision of
this Agreement or


<PAGE>


                                      -12-

otherwise.  The  Company  shall use all  reasonable  efforts to ensure  that the
provisions of this Section 7(e) and Section 4(b) hereof are complied  with,  but
the Company and the Rights Agent shall have no liability to any holder of Rights
Certificates  or other Person as a result of the  Company's  failure to make any
determinations  with respect to an Acquiring Person or any of their  Affiliates,
Associates or transferees hereunder.

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

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

         Section 9.  Reservation and Availability of Capital Stock.

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

         (b) So long as, and to the extent that,  the shares of Preferred  Stock
(and,  following the occurrence of a Triggering Event, Common Stock and/or other
securities)  issuable  and  deliverable  upon the  exercise of the Rights may be
listed on any national securities exchange, the Company shall use its reasonable
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.



<PAGE>


                                      -13-

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

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

         (e) The Company further  covenants and agrees that, except as set forth
in Section 6(a) hereof, it will pay when due and payable any and all federal and
state transfer taxes and charges which may be payable in respect of the issuance
or delivery of the Rights  Certificates  and of any certificates for a number of
one  one-hundredths  of a share of Preferred Stock (or Common Stock and/or other
securities,  as the case may be) upon the exercise of Rights.  The Company shall
not,  however,  be  required  to pay any  transfer  tax which may be  payable in
respect of any  transfer or delivery of Rights  Certificates  to a Person  other
than, or the issuance or delivery of a number of one  one-hundredths  of a share
of Preferred Stock (or Common Stock and/or other securities, as the case may be)
in respect of a name  other  than that of, the  registered  holder of the Rights
Certificates  evidencing Rights surrendered for exercise,  nor shall the Company
be  required  to  issue  or  deliver  any  certificates  for  a  number  of  one
one-hundredths  of a share of  Preferred  Stock (or Common  Stock  and/or  other
securities,  as the case may be) in a name  other  than  that of the  registered
holder upon the  exercise of any Rights until such tax shall have been paid (any
such tax being payable by the


<PAGE>


                                      -14-

holder of such Rights Certificate at the time of surrender) or until it has been
established to the Company's satisfaction that no such tax is due.

         Section 10.  Preferred Stock Record Date. Each person in whose name any
certificate for a number of one one-hundredths of a share of Preferred Stock (or
Common  Stock and/or  other  securities,  as the case may be) is issued upon the
exercise of Rights shall for all purposes be deemed to have become the holder of
record of such  fractional  shares of  Preferred  Stock (or Common  Stock and/or
other  securities,  as the  case  may  be)  represented  thereby  on,  and  such
certificate  shall  be  dated,  the  date  upon  which  the  Rights  Certificate
evidencing  such Rights was duly  surrendered  and payment of the Purchase Price
(and all applicable  transfer taxes) was made;  provided,  however,  that if the
date of such surrender and payment is a date upon which the Preferred  Stock (or
Common Stock and/or other securities,  as the case may be) transfer books of the
Company are closed, such Person shall be deemed to have become the record holder
of such shares  (fractional  or  otherwise)  on, and such  certificate  shall be
dated, the next succeeding  Business Day on which the Preferred Stock (or Common
Stock and/or other securities, as the case may be) transfer books of the Company
are open. Prior to the exercise of the Rights evidenced thereby, the holder of a
Rights  Certificate  shall not be entitled to any rights of a shareholder of the
Company  with  respect  to shares  for which the  Rights  shall be  exercisable,
including  without  limitation the right to vote, to receive  dividends or other
distributions or to exercise any preemptive rights, and shall not be entitled to
receive any notice of any proceedings of the Company, except as provided herein.

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

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


<PAGE>


                                      -15-

         Section 11(a)(i) and Section 11(a)(ii) hereof, the adjustment  provided
         for in this Section 11(a)(i) shall be in addition to, and shall be made
         prior to, any adjustment required pursuant to Section 11(a)(ii) hereof.

                           (ii) In the event (a "Section  11(a)(ii)  Event") any
         Person  (other  than an  Exempt  Person)  alone  or  together  with its
         Affiliates and Associates  (other than an Exempt Person) shall,  at any
         time after the Rights Dividend  Declaration  Date,  become an Acquiring
         Person,  unless the event  causing  such Person to become an  Acquiring
         Person is (x) a  Section  13 Event or (y) an  acquisition  of shares of
         Common  Stock of the Company  pursuant to a tender offer or an exchange
         offer for all  outstanding  shares of Common  Stock of the Company at a
         price and on terms  determined  by at least a majority  of the  Outside
         Directors,  after receiving advice from one or more investment  banking
         firms, to be (a) at a price which is fair to shareholders  (taking into
         account  all  factors  which  such  Outside  Directors  deem  relevant,
         including,  without  limitation,   prices  which  could  reasonably  be
         achieved  if the  Company or its assets  were sold on an orderly  basis
         designed  to  realize  maximum  value)  and (b)  otherwise  in the best
         interests of the Company and its shareholders,  then promptly after the
         date of occurrence of a Section 11(a)(ii) Event, proper provision shall
         be made so that each holder of a Right (except as provided below and in
         Section 7(e) hereof) shall  thereafter have the right to receive,  upon
         exercise  thereof at the then current Purchase Price in accordance with
         the terms of this Agreement,  in lieu of a number of one one-hundredths
         of a share of Preferred Stock, such number of shares of Common Stock of
         the Company as shall equal the result  obtained by (x)  multiplying the
         then current Purchase Price by the then number of one one-hundredths of
         a  share  of  Preferred   Stock  for  which  a  Right  was  exercisable
         immediately prior to the first occurrence of a Section 11(a)(ii) Event,
         whether or not such Right was then  exercisable,  and (y) dividing that
         product (which,  following such first  occurrence,  shall thereafter be
         referred to as the "Purchase Price" for each Right and for all purposes
         of this  Agreement)  by 50% of the  Current  Market  Price per share of
         Common Stock of the Company on the date of such first  occurrence (such
         number of shares being referred to as the "Adjustment Shares").

                           (iii) In lieu of  issuing  shares of Common  Stock of
         the Company in accordance with Section 11(a)(ii)  hereof,  the Company,
         acting by resolution of the Board (which  resolution shall be effective
         only with the  concurrence of a majority of the Continuing  Directors),
         may,  and in the event that the number of shares of Common Stock of the
         Company which are authorized by the Company's  Articles of Organization
         (as the same may be  amended  and  restated  from time to time) but not
         outstanding  or reserved  for  issuance  for  purposes  other than upon
         exercise of the Rights is not sufficient to permit the exercise in full
         of the Rights in accordance with the foregoing Section  11(a)(ii),  the
         Company,  acting by resolution of the Board (which  resolution shall be
         effective  only with the  concurrence  of a majority of the  Continuing
         Directors),  shall  (A)  determine  the  excess of (1) the value of the
         Adjustment  Shares  issuable upon the exercise of a Right (the "Current
         Value") over (2) the Purchase  Price  attributable  to each Right (such
         excess being referred to as the "Spread"), and (B) with respect to each
         Right  (subject to Section 7(e)  hereof),  make  adequate  provision to
         substitute for the Adjustment Shares, upon payment of the applicable


<PAGE>


                                      -16-

         Purchase Price,  (1) cash, (2) a reduction in the Purchase  Price,  (3)
         equity securities of the Company other than Common Stock of the Company
         (including,   without  limitation,  shares,  or  units  of  shares,  of
         preferred  stock  which the Board has  deemed to have the same value as
         shares of Common Stock (such shares of preferred  stock being  referred
         to as "Common Stock Equivalents")), (4) debt securities of the Company,
         (5) other assets or (6) any  combination of the foregoing  which,  when
         added to any shares of Common Stock issued upon such exercise,  have an
         aggregate value equal to the Current Value,  where such aggregate value
         has been determined by the Board (with the concurrence of a majority of
         the  Continuing  Directors)  based  upon  the  advice  of a  nationally
         recognized  investment  banking firm  selected by the Board;  provided,
         however,  if the  Company  shall not have made  adequate  provision  to
         deliver  value  pursuant  to  clause  (B) above  within  thirty 30 days
         following the later of (x) the first occurrence of a Section  11(a)(ii)
         Event  and (y) the  date on which  the  Company's  right of  redemption
         pursuant to Section 23(a) hereof,  as such date may be amended pursuant
         to Section 26 hereof,  expires (the later of (x) and (y) being referred
         to herein as the "Section  11(a)(ii)  Trigger Date"),  then the Company
         shall be obligated  to deliver,  upon the  surrender  for exercise of a
         Right and without  requiring  payment of the Purchase Price,  shares of
         Common  Stock of the Company  (to the extent  available)  and then,  if
         necessary, cash, which shares and/or cash have an aggregate value equal
         to the Spread.  If the Board (with the concurrence of a majority of the
         Continuing  Directors)  shall determine in good faith that it is likely
         that sufficient  additional shares of Common Stock of the Company could
         be authorized  for issuance  upon  exercise in full of the Rights,  the
         thirty  (30) day period set forth  above may be  extended to the extent
         necessary,  but not more  than  ninety  (90)  days  after  the  Section
         11(a)(ii)  Trigger Date, in order that the Company may seek shareholder
         approval for the  authorization of such additional shares (such period,
         as it may be extended  being  referred  to herein as the  "Substitution
         Period").  To the extent that the Company  determines  that some action
         need be taken  pursuant to the first  and/or  second  sentences of this
         Section 11(a)(iii),  the Company (x) shall provide,  subject to Section
         7(e) hereof,  that such action shall apply uniformly to all outstanding
         Rights and (y) may suspend the  exercisability  of the Rights until the
         expiration   of  the   Substitution   Period   in  order  to  seek  any
         authorization  of additional  shares  and/or to decide the  appropriate
         form of  distribution to be made pursuant to such first sentence and to
         determine the value thereof.  In the event of any such suspension,  the
         Company   shall   issue  a  public   announcement   stating   that  the
         exercisability of the Rights has been temporarily suspended, as well as
         a public  announcement  at such time as the  suspension is no longer in
         effect.  For  purposes  of this  Section  11(a)(iii),  the value of the
         Common Stock of the Company shall be the Current Market Price per share
         of the Common  Stock of the  Company on the Section  11(a)(ii)  Trigger
         Date and the value of any Common  Stock  Equivalent  shall be deemed to
         have the same value as the Common Stock of the Company on such date.

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


<PAGE>


                                      -17-

Preferred  Stock  or per  share  of  Equivalent  Preferred  Stock  (or  having a
conversion  price per share, if a security  convertible  into Preferred Stock or
Equivalent  Preferred  Stock)  less than the Current  Market  Price per share of
Preferred  Stock on such record date,  the Purchase  Price to be in effect after
such record date shall be determined by multiplying the Purchase Price in effect
immediately  prior to such  record date by a fraction,  the  numerator  of which
shall be the number of shares of  Preferred  Stock  outstanding  on such  record
date, plus the number of shares of Preferred Stock and/or  Equivalent  Preferred
Stock which the aggregate  subscription or purchase price of the total number of
shares of Preferred  Stock and/or  Equivalent  Preferred  Stock so to be offered
(and/or the aggregate initial conversion price of the convertible  securities so
to be offered) would purchase at such Current Market Price,  and the denominator
of which shall be the number of shares of Preferred  Stock  outstanding  on such
record date,  plus the number of  additional  shares of  Preferred  Stock and/or
Equivalent  Preferred Stock to be offered for  subscription or purchase (or into
which the convertible securities so to be offered are initially convertible). In
case such  subscription  price may be paid by delivery of consideration  part or
all of which may be in a form other than cash,  the value of such  consideration
shall be as  determined  in good faith by the Board (with the  concurrence  of a
majority of the Continuing Directors), whose determination shall be described in
a  statement  filed  with the  Rights  Agent  and  shall be  conclusive  for all
purposes.  Shares of  Preferred  Stock  owned by or held for the  account of the
Company shall not be deemed outstanding for the purpose of any such computation.
Such adjustment shall be made successively whenever such a record date is fixed,
and in the event that such rights,  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  Company  shall  fix a  record  date  for a
distribution to all holders of Preferred Stock (including any such  distribution
made in connection  with a  consolidation  or merger in which the Company is the
continuing or surviving  corporation) of evidences of indebtedness,  cash (other
than a regular  periodic cash dividend out of the earnings or retained  earnings
of the Company),  assets (other than a dividend  payable in Preferred Stock, but
including  any  dividend  payable  in  stock  other  than  Preferred  Stock)  or
subscription  rights or warrants  (excluding  those referred to in Section 11(b)
hereof),  the  Purchase  Price to be in effect  after such  record date shall be
determined by multiplying the Purchase Price in effect immediately prior to such
record date by a fraction,  the  numerator of which shall be the Current  Market
Price per share of  Preferred  Stock on such record  date,  less the fair market
value (as  determined  in good  faith by the Board  (with the  concurrence  of a
majority of the Continuing Directors), whose determination shall be described in
a  statement  filed with the Rights  Agent and shall be binding  upon the Rights
Agent and the  holders  of the  Rights) of the  portion  of the cash,  assets or
evidences of indebtedness so to be distributed or of such subscription rights or
warrants  applicable to a share of Preferred  Stock and the denominator of which
shall  be  such  Current  Market  Price  per  share  of  Preferred  Stock.  Such
adjustments shall be made successively whenever such a record date is fixed, and
in the event that such  distribution is not so made, the Purchase Price shall be
adjusted to be the Purchase Price which would have been in effect if such record
date had not been fixed.

                  (d) (i) For the purpose of any  computation  hereunder,  other
         than  computations  made  pursuant to Section  11(a)(iii)  hereof,  the
         Current Market Price per share


<PAGE>


                                      -18-

         of Common  Stock on any date  shall be deemed to be the  average of the
         daily closing prices per share of such Common Stock for the thirty (30)
         consecutive  Trading  Days  immediately  prior  to such  date,  and for
         purposes of computations  made pursuant to Section  11(a)(iii)  hereof,
         the Current Market Price per share of Common Stock on any date shall be
         deemed to be the average of the daily closing  prices per share of such
         Common  Stock for the ten (10)  consecutive  Trading  Days  immediately
         following  such  date;  provided,  however,  that in the event that the
         Current Market Price per share of the Common Stock is determined during
         a period following the announcement by the Company of (A) a dividend or
         distribution  on such  Common  Stock  payable in shares of such  Common
         Stock or securities convertible into shares of such Common Stock (other
         than the Rights) or (B) any  subdivision,  combination,  consolidation,
         reverse stock split or reclassification of such Common Stock, and prior
         to the expiration of the requisite  thirty (30) Trading Day or ten (10)
         Trading Day period, as set forth above,  after the ex-dividend date for
         such dividend or distribution, or the record date for such subdivision,
         combination,  consolidation,  reverse stock split or  reclassification,
         then,  in each such case,  the Current  Market  Price shall be properly
         adjusted to take into account  ex-dividend  trading.  The closing price
         for each day shall be the last sale price,  regular  way, or in case no
         such sale takes  place on such day,  the average of the closing bid and
         asked prices,  regular way, in either case as reported in the principal
         consolidated  transaction  reporting  system with respect to securities
         listed or admitted to trading on the New York Stock Exchange, or if the
         shares of Common Stock are not listed or admitted to trading on the New
         York  Stock  Exchange,  as  reported  in  the  principal   consolidated
         transaction  reporting system with respect to securities  listed on the
         principal  national  securities  exchange on which the shares of Common
         Stock are listed or  admitted  to  trading,  or if the shares of Common
         Stock are not listed or admitted to trading on any national  securities
         exchange,  the last quoted price,  or if not so quoted,  the average of
         the high bid and low asked prices in the  over-the-counter  market,  as
         reported by the Nasdaq  National  Market or the Nasdaq  Stock Market or
         such other  quotation  system  then in use,  or if on any such date the
         shares of Common  Stock are not  quoted by any such  organization,  the
         average  of  the  closing  bid  and  asked  prices  as  furnished  by a
         professional  market maker making a market in the Common Stock selected
         by the Board  (with the  concurrence  of a majority  of the  Continuing
         Directors).  If the Common Stock is not publicly held or not so listed,
         traded or quoted,  and a market  maker is not making a market,  Current
         Market  Price per share of Common  Stock  shall mean the fair value per
         share as determined in good faith by the Board (with the concurrence of
         a majority of the Continuing  Directors),  whose determination shall be
         described  in a  statement  filed  with the  Rights  Agent and shall be
         conclusive for all purposes.

                  (ii) For the purpose of any computation hereunder, the Current
         Market Price per share of Preferred  Stock shall be  determined  in the
         same manner as set forth above for the Common Stock in subparagraph (i)
         of this Section  11(d) (other than the last sentence  thereof).  If the
         Current Market Price per share of Preferred  Stock cannot be determined
         in the manner  provided above or if the Preferred Stock is not publicly
         held or listed or traded in a manner  described in subparagraph  (i) of
         this  Section  11(d),  the Current  Market Price per share of Preferred
         Stock  shall be  conclusively  deemed to be an amount  equal to 100 (as
         such  number may be  appropriately  adjusted  for such  events as stock
         splits, stock dividends and


<PAGE>


                                      -19-

         recapitalizations  with respect to the Common Stock occurring after the
         date of this  Agreement)  multiplied  by the Current  Market  Price per
         share  of the  Common  Stock.  If  neither  the  Common  Stock  nor the
         Preferred Stock is publicly held or so listed or traded, Current Market
         Price per share of the  Preferred  Stock  shall mean the fair value per
         share as determined in good faith by the Board (with the concurrence of
         a majority of the Continuing  Directors),  whose determination shall be
         described  in a  statement  filed  with the  Rights  Agent and shall be
         conclusive for all purposes.  For all purposes of this  Agreement,  the
         Current Market Price of one one-hundredth of a share of Preferred Stock
         shall be equal to the Current  Market  Price of one share of  Preferred
         Stock  divided by 100. The term "Trading Day" shall mean a day on which
         the  principal  national  securities  exchange  on which the  shares of
         Common  Stock  are  listed  or  admitted  to  trading  is open  for the
         transaction  of  business,  or if the  shares of  Common  Stock are not
         listed or admitted to trading on any national  securities  exchange,  a
         Business Day.

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

         (f) If as a result of an adjustment made pursuant to Section  11(a)(ii)
or Section  13(a) hereof,  the holder of any Right  thereafter  exercised  shall
become  entitled  to receive any shares of capital  stock  other than  Preferred
Stock, thereafter the number of such other shares so receivable upon exercise of
any Right and the  Purchase  Price  thereof  (or the number of rights)  shall be
subject  to  adjustment  from  time to time in a manner  and on terms as  nearly
equivalent as practicable to the provisions  with respect to the Preferred Stock
contained in Sections 11(a), (b), (c), (e), (g), (h), (i), (j), (k) and (m), and
the  provisions  of  Sections  7, 9, 10, 13 and 14 hereof  with  respect  to the
Preferred  Stock shall apply on like terms to any such other  shares;  provided,
however,  that the Company  shall not be liable for its inability to reserve and
keep  available  for issuance  upon  exercise of the Rights  pursuant to Section
11(a)(ii)  a number of shares of Common  Stock of the Company  greater  than the
number then authorized by the Company's  Articles of  Organization  (as the same
may be amended and restated from time to time) but not  outstanding  or reserved
for any other purpose.

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



<PAGE>


                                      -20-

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

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

         (j)  Irrespective  of any adjustment or change in the Purchase Price or
the number of one one-hundredths of a share of Preferred Stock issuable upon the
exercise of the  Rights,  the Rights  Certificates  theretofore  and  thereafter
issued may continue to express the Purchase  Price per one  one-hundredths  of a
share and the number of one  one-hundredths  of a share which were  expressed in
the initial Rights Certificates issued hereunder.

         (k) Before  taking any action that would cause an  adjustment  reducing
the  Purchase  Price below the then stated  value,  if any, of the number of one
one-hundredths of a share of Preferred


<PAGE>


                                      -21-

Stock  issuable  upon  exercise  of the Rights,  the Company  shall use its best
efforts to take any  corporate  action which may, in the opinion of its counsel,
be necessary in order that the Company may validly and legally  issue fully paid
and  nonassessable  such number of one  one-hundredths  of a share of  Preferred
Stock 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 Company may elect to defer until the  occurrence  of such
event the issuance to the holder of any Right  exercised  after such record date
the number of one one-hundredths of a share of Preferred Stock and other capital
stock or securities of the Company, if any, issuable upon such exercise over and
above the number of one  one-hundredths  of a share of Preferred Stock and other
capital stock or securities of the Company,  if any, issuable upon such exercise
on the basis of the Purchase Price in effect prior to such adjustment; provided,
however,  that the  Company  shall  deliver  to such  holder a due bill or other
appropriate instrument evidencing such holder's right to receive such additional
shares  (fractional or otherwise) or securities upon the occurrence of the event
requiring such adjustment.

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

         (n) The  Company  covenants  and agrees  that it shall not, at any time
after the Distribution Date, (i) consolidate with any other Person (other than a
Subsidiary  of the Company in a  transaction  which  complies with Section 11(o)
hereof),  (ii) merge with or into any other Person  (other than a Subsidiary  of
the Company in a transaction  which complies with 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 Company and its
Subsidiaries  (taken as a whole) to any other Person or Persons  (other than the
Company and/or any of its Subsidiaries in one or more transactions each of which
complies with Section 11(o) hereof),  if (x) at the time of or immediately after
such consolidation,  merger, sale or transfer there are any rights,  warrants or
other instruments or securities  outstanding or agreements in effect which would
substantially  diminish  or  otherwise  eliminate  the  benefits  intended to be
afforded by the Rights or (y) prior to, simultaneously with or immediately after
such consolidation, merger, sale or transfer, the stockholders of the Person who
constitutes,  or would constitute, the "Principal Party" for purposes of Section
13(a) hereof shall have received a distribution  of Rights  previously  owned by
such Person or any of its Affiliates and Associates.

         (o) The Company covenants and agrees that, after the Distribution Date,
it will not,  except as  permitted  by Section  23,  Section  26,  Section 29 or
Section 31 hereof, take (or permit any


<PAGE>


                                      -22-

Subsidiary  to take)  any  action  if at the  time  such  action  is taken it is
reasonably foreseeable that such action will diminish substantially or otherwise
eliminate the benefits intended to be afforded by the Rights.

         (p) Anything in this Agreement to the contrary notwithstanding,  in the
event that the Company shall at any time after the Rights  Dividend  Declaration
Date  and  prior  to  the  Distribution  Date  (i)  declare  a  dividend  on the
outstanding  shares of Common  Stock of the Company  payable in shares of Common
Stock of the Company,  (ii) subdivide the outstanding  shares of Common Stock of
the  Company  in a  manner  not  covered  in (i)  above  or  (iii)  combine  the
outstanding  shares  of Common  Stock of the  Company  into a smaller  number of
shares,  (x) the number of one one-hundredths of a share of Preferred Stock then
purchasable upon exercise of a Right shall be  proportionately  adjusted so that
the  number of one  one-hundredths  of a share of  Preferred  Stock  purchasable
thereafter upon proper exercise of each Right shall equal the result obtained by
multiplying  the number of one  one-hundredths  of a share of Preferred Stock so
purchasable immediately prior to such event by a fraction the numerator of which
shall be the total number of shares of Common  Stock of the Company  outstanding
immediately  prior to the  occurrence of the event and the  denominator of which
shall be the total number of shares of Common  Stock of the Company  outstanding
immediately following the occurrence of such event and (y) action shall be taken
such that each  share of Common  Stock of the  Company  outstanding  immediately
after such event  shall have  issued  with  respect to it that  number of Rights
which each share of Common Stock of the Company outstanding immediately prior to
such event had issued with respect to it. The  adjustments  provided for in this
Section 11(p) shall be made successively whenever such a dividend is declared or
paid or such a subdivision,  combination  or  consolidation  is effected.  If an
event occurs which would require an adjustment under Section  11(a)(ii) and this
Section 11(p),  the  adjustments  provided for in this Section 11(p) shall be in
addition and prior to any adjustment required pursuant to Section 11(a)(ii).

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

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

         (a) In the event (a  "Section  13 Event")  that,  on or after the Stock
Acquisition Date,  directly or indirectly,  (x) the Company shall consolidate or
otherwise  combine  with,  or merge  with or into,  any other  Person or Persons
(other than a Subsidiary of the Company in a transaction which


<PAGE>


                                      -23-

complies with Section 11(o) hereof), and the Company shall not be the continuing
or surviving  corporation of such consolidation,  combination or merger, (y) any
Person or Persons (other than a Subsidiary of the Company in a transaction which
complies with Section 11(o) hereof) shall  consolidate or combine with, or merge
with or into, the Company,  and the Company shall be the continuing or surviving
corporation of such consolidation, combination or merger and, in connection with
such consolidation, combination or merger, all or part of the outstanding shares
of Common Stock of the Company  shall be changed into or exchanged  for stock or
other securities of any other Person or Persons or cash or any other property or
(z)  the  Company  shall  sell  or  otherwise  transfer  (or  one or more of its
Subsidiaries shall sell or otherwise  transfer),  in one transaction or a series
of related  transactions,  assets or earning power  aggregating more than 50% of
the assets or earning  power of the  Company  and its  Subsidiaries  (taken as a
whole  and  calculated  on the  basis of the  Company's  most  recent  regularly
prepared financial  statements) to any Person or Persons (other than the Company
or any  Subsidiary  of the  Company  in one or more  transactions  each of which
complies with Section 11(o) hereof); provided,  however, that this clause (z) of
Section  13(a)  shall not apply to the pro rata  distribution  by the Company of
assets  (including  securities) of the Company or any of its Subsidiaries to all
holders of the Company's  Common Stock;  then,  and in each such case (except as
may be contemplated by 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, on or after the later of (A) the date of the first occurrence of any such
Section 13 Event or (B) the date of the  expiration  of the period  within which
the Rights  may be  redeemed  pursuant  to Section 23 hereof (as the same may be
amended  or  reinstated  as  provided  in  Section  26  or  Section  31  hereof,
respectively),  have the right to receive, upon the exercise thereof at the then
current  Purchase  Price in accordance  with the terms of this  Agreement,  such
number of validly  authorized and issued,  fully paid,  nonassessable and freely
tradeable  shares of Common  Stock of the  Principal  Party,  not subject to any
liens,  encumbrances,  rights of first refusal or other adverse claims, as shall
be equal to the result  obtained by (1)  multiplying  the then current  Purchase
Price by the  number of one  one-hundredths  of a share of  Preferred  Stock for
which a Right is  exercisable  immediately  prior to the first  occurrence  of a
Section 13 Event (or, if a Section  11(a)(ii)  Event has  occurred  prior to the
first  occurrence  of a Section  13 Event,  multiplying  the  number of such one
one-hundredths of a share for which a Right was exercisable immediately prior to
the first  occurrence  of a Section  11(a)(ii)  Event by the  Purchase  Price in
effect  immediately  prior to such  first  occurrence),  and (2)  dividing  that
product (which,  following the first occurrence of a Section 13 Event,  shall be
referred to as the "Purchase  Price" for each Right and for all purposes of this
Agreement)  by 50% of the Current  Market Price per share of the Common Stock of
such Principal Party on the date of consummation of such Section 13 Event;  (ii)
such Principal Party shall thereafter be liable for, and shall assume, by virtue
of such Section 13 Event, all the obligations and duties of the Company pursuant
to this Agreement;  (iii) the term "Company" shall thereafter be deemed to refer
to such Principal Party, it being  specifically  intended that the provisions of
Section 11 hereof shall apply only to such Principal  Party  following the first
occurrence  of a Section 13 Event;  (iv) such  Principal  Party  shall take such
steps (including,  but not limited to, the reservation of a sufficient number of
shares of its Common  Stock) in  connection  with the  consummation  of any such
transaction  as may be  necessary  to assure that the  provisions  hereof  shall
thereafter be  applicable,  as nearly as  reasonably  may be, in relation to its
shares of Common Stock  thereafter  deliverable upon the exercise of the Rights;
and (v) the


<PAGE>


                                      -24-

provisions of Section 11(a)(ii) hereof shall be of no effect following the first
occurrence of any Section 13 Event.

         (b) For purposes of this  Agreement,  "Principal  Party" shall mean the
following:

                  (i) in the case of any transaction  described in clause (x) or
         (y) of the first sentence of Section 13(a) hereof,  (A) the Person that
         is the issuer of any  securities  into which  shares of Common Stock of
         the  Company  are  converted,  changed  or  exchanged  in such  merger,
         consolidation or combination, or if there is more than one such issuer,
         the issuer the Common Stock of which has the  greatest  market value or
         (B) if no securities are so issued,  the Person that is the other party
         to such merger (and survives the merger),  consolidation or combination
         (or if there is more than one such Person,  the Person the Common Stock
         of which has the greatest  value),  or if the other party to the merger
         does not survive the  merger,  the Person that does  survive the merger
         (including the Company if it survives); and

                  (ii) in the case of any transaction described in clause (z) of
         the first  sentence  of Section  13(a),  the  Person  that is the party
         receiving  the  greatest   portion  of  the  assets  or  earning  power
         transferred  pursuant to such  transaction or transactions  or, if each
         Person that is a party to such transaction or transactions receives the
         same portion of the assets or earning  power so  transferred  or if the
         Person  receiving  the greatest  portion of the assets or earning power
         cannot be determined, whichever of such Persons as is the issuer of the
         Common Stock having the greatest aggregate market value;

                  (iii) provided, however, that in any such case as described in
         subparagraphs  (i) or (ii) of this  Section  13(b),  (1) if the  Common
         Stock of such Person is not at such time and has 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 Stock of which is and has been so registered,
         "Principal  Party" shall refer to such other Person;  (2) if the Common
         Stock of such  Person  is not and has not been so  registered  and such
         Person  is a  Subsidiary,  directly  or  indirectly,  of more  than one
         Person,  the Common Stocks of two or more of which are and have been so
         registered,  "Principal Party" shall refer to whichever of such Persons
         is the issuer of the Common Stock having the greatest  aggregate market
         value;  and (3) if the Common  Stock of such  Person is not and has not
         been so registered and 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 Company  shall not  consummate  any Section 13 Event unless the
Principal  Party  shall have a  sufficient  number of  authorized  shares of its
Common  Stock which have not been issued or reserved  for issuance to permit the
exercise in full of the Rights in accordance with this Section


<PAGE>


                                      -25-

13 and unless  prior  thereto the Company  and such  Principal  Party shall have
executed and delivered to the Rights Agent a supplemental  agreement  confirming
that the  requirements  of  Sections  13(a) and (b)  hereof  shall  promptly  be
performed  in  accordance  with their terms and that such Section 13 Event shall
not result in a default by the Principal  Party under this Agreement as the same
shall have been assumed by the Principal  Party  pursuant to Sections  13(a) and
(b) hereof and further  providing that, as soon as practicable after the date of
such Section 13 Event, the Principal Party will:

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

                  (ii) use its best  efforts to list or obtain  quotation of (or
         continue  the listing or  quotation  of) the Rights and the  securities
         purchasable  upon  exercise  of the  Rights  on a  national  securities
         exchange or automated quotation service;

                  (iii)  will  deliver  to  holders  of  the  Rights  historical
         financial statements for the Principal Party and each of its Affiliates
         which comply in all respects with the  requirements for registration on
         Form 10 (or any successor form) under the Exchange Act; and

                  (iv) use its best  efforts to obtain  waivers of any rights of
         first refusal or  preemptive  rights in respect of the shares of Common
         Stock of the  Principal  Party  subject to  purchase  upon  exercise of
         outstanding Rights.

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

         (d) Notwithstanding anything in this Agreement to the contrary, Section
13 shall not be applicable to a transaction described in subparagraph (x) or (y)
of Section 13(a) if (i) such transaction is consummated with a Person or Persons
(or a wholly owned subsidiary of any such Person or Persons) who acquired shares
of Common Stock of the Company  pursuant to a tender offer or exchange offer for
all  outstanding  shares of Common Stock of the Company which  complies with the
exception provided for in Section 11(a)(ii) hereof,  (ii) the price per share of
Common  Stock of the Company  offered in such  transaction  is not less than the
price per share of Common Stock paid to all holders of shares of Common Stock of
the Company  whose  shares  were  purchased  pursuant  to such  tender  offer or
exchange  offer  and  (iii)  the  form of  consideration  being  offered  to the
remaining  holders of shares of Common Stock pursuant to such transaction is the
same as the form of consideration paid pursuant to such tender offer or exchange
offer.  Upon  consummation of any such transaction  contemplated by this Section
13(d), all Rights hereunder shall expire.



<PAGE>


                                      -26-

         Section 14.  Fractional Rights and Fractional Shares.

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

         (b) The Company  shall not be required to issue  fractions of shares of
Preferred  Stock  (other than  fractions  which are  integral  multiples  of one
one-hundredth  of a share of Preferred  Stock) upon exercise of the Rights or to
distribute  certificates  which evidence  fractional  shares of Preferred  Stock
(other than fractions  which are integral  multiples of one  one-hundredth  of a
share of Preferred  Stock). In lieu of fractional shares of Preferred Stock that
are not integral  multiples of one  one-hundredth of a share of Preferred Stock,
the Company may pay to the registered holders of Rights Certificates at the time
such Rights are exercised as herein provided an amount in cash equal to the same
fraction  of the  current  market  value  of one  one-hundredth  of a  share  of
Preferred Stock. For purposes of this Section 14(b), the current market value of
one  one-hundredth  of a share of Preferred Stock shall be one  one-hundredth of
the  closing  price  of a share of  Preferred  Stock  or,  if  unavailable,  the
appropriate  alternative  price (in each case as determined  pursuant to Section
11(d)(ii)  hereof)  for the Trading  Day  immediately  prior to the date of such
exercise.

         (c) Following the occurrence of a Triggering  Event,  the Company shall
not be required to issue fractions of shares of Common Stock of the Company upon
exercise of the Rights or to distribute  certificates which evidence  fractional
shares of Common Stock of the Company.  In lieu of  fractional  shares of Common
Stock of the Company,  the Company may pay to the  registered  holders of Rights
Certificates at the time such Rights are exercised as herein provided an amount


<PAGE>


                                      -27-

in cash equal to the same fraction of the current  market value of one (1) share
of Common Stock of the Company.  For purposes of this Section 14(c), the current
market  value of one share of Common  Stock  shall be the  closing  price of one
share of Common Stock or, if unavailable,  the appropriate alternative price (in
each case as determined pursuant to Section 11(d)(i) hereof) for the Trading Day
immediately prior to the date of such exercise.

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

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

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

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

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

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


<PAGE>


                                      -28-

subject to the last  sentence of Section  7(e)  hereof,  shall be required to be
affected by any notice to the contrary; and

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

         Section 17.  Rights  Certificate  Holder Not Deemed a  Shareholder.  No
holder, as such, of any Rights  Certificate  shall be entitled to vote,  receive
dividends  or be  deemed  for  any  purpose  the  holder  of the  number  of one
one-hundredths  of a share of  Preferred  Stock or any other  securities  of the
Company  which  may at any  time  be  issuable  on the  exercise  of the  Rights
represented  thereby,  nor shall  anything  contained  herein  or in any  Rights
Certificate be construed to confer upon the holder of any Rights Certificate, as
such, any of the rights of a shareholder of the Company or any right to vote for
the election of directors or upon any matter  submitted to  shareholders  at any
meeting thereof,  or to give or withhold consent to any corporate  action, or to
receive notice of meetings or other actions  affecting  shareholders  (except as
provided in Section 24 hereof),  or to receive dividends or other  distributions
on  shares  of any  series  or class of the  capital  stock of the  Company,  or
otherwise,  until the Right or Rights evidenced by such Rights Certificate shall
have been exercised in accordance with the provisions hereof.

         Section 18.  Concerning the Rights Agent.

         (a)  The  Company  agrees  to  pay  to  the  Rights  Agent   reasonable
compensation  for all services  rendered by it hereunder and, from time to time,
on demand of the Rights  Agent,  its  reasonable  expenses  and counsel fees and
disbursements  and  other  disbursements  incurred  in  the  administration  and
execution  of this  Agreement  and the exercise  and  performance  of its duties
hereunder.  The Company  also agrees to  indemnify  the Rights Agent for, and to
hold it harmless  against,  any loss,  liability,  or expense,  incurred without
negligence, bad faith or willful misconduct on the part of the Rights Agent, for
anything done or omitted by the Rights Agent in connection  with the  acceptance
and  administration  of this  Agreement,  including  the costs and  expenses  of
defending against any claim of liability in the premises.  In no event shall the
Rights Agent be liable for special,  indirect,  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.

         (b) The Rights  Agent shall be  protected  and shall incur no liability
for or in respect of any action  taken,  suffered or omitted by it in connection
with  its   administration  of  this  Agreement  in  reliance  upon  any  Rights
Certificate  or  certificate  for Common  Stock or for other  securities  of the
Company,  instrument of assignment or transfer, power of attorney,  endorsement,
affidavit, letter,


<PAGE>


                                      -29-

notice, direction,  consent,  certificate,  statement or other paper or document
reasonably  believed by it to be genuine and to be signed,  executed and,  where
necessary, verified or acknowledged by the proper Person or Persons.

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

         (a) Any corporation into which the Rights Agent or any successor Rights
Agent may be merged or with  which it may be  consolidated,  or any  corporation
resulting  from any merger or  consolidation  to which the  Rights  Agent or any
successor  Rights Agent shall be a party, or any  corporation  succeeding to the
corporate trust or stock transfer  business of the Rights Agent or any successor
Rights Agent,  shall be the  successor to the Rights Agent under this  Agreement
without the  execution  or filing of any paper or any further act on the part of
any of the parties hereto;  provided,  however,  that such corporation  would be
eligible for  appointment  as a successor  Rights Agent under the  provisions of
Section 21 hereof.  If at the time such successor  Rights Agent shall succeed to
the agency created by this Agreement,  any of the Rights Certificates shall have
been countersigned but not delivered,  any such successor Rights Agent may adopt
the  countersignature  of a  predecessor  Rights  Agent and deliver  such Rights
Certificates  so  countersigned;   and  if  at  that  time  any  of  the  Rights
Certificates shall not have been  countersigned,  any successor Rights Agent may
countersign such Rights Certificates either in the name of the predecessor or in
the name of the  successor  Rights  Agent;  and in all such  cases,  such Rights
Certificates  shall have the full force provided in the Rights  Certificates and
in this Agreement.

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

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

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

         (b) Whenever in the  performance of its duties under this Agreement the
Rights  Agent  shall  deem it  necessary  or  desirable  that any fact or matter
(including,  without  limitation,  the identity of any Acquiring  Person and the
determination  of the  Current  Market  Price) be proved or  established  by the
Company prior to taking or suffering any action  hereunder,  such fact or matter
(unless other evidence in respect thereof be herein specifically prescribed) may
be deemed to be conclusively


<PAGE>


                                      -30-

proved and established by a certificate signed by the Chairman of the Board, the
Chief Executive Officer, the President, any Vice President, the Treasurer or any
Assistant  Treasurer of the Company and delivered to the Rights Agent;  and such
certificate shall be full authorization to the Rights Agent for any action taken
or  suffered  in good  faith by it under the  provisions  of this  Agreement  in
reliance upon such certificate.

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

         (d) The Rights Agent shall not be liable for or by reason of any of the
statements  of fact or recitals  contained  in this  Agreement  or in the Rights
Certificates,  nor shall it be  required  to verify  the same  (except as to its
countersignature  on such  Rights  Certificates),  but all such  statements  and
recitals are and shall be deemed to have been made by the Company only.

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

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

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

         (h) The Rights Agent and any stockholder, director, officer or employee
of the  Rights  Agent  may  buy,  sell  or deal in any of the  Rights  or  other
securities of the Company or become pecuniarily interested in any transaction in
which the  Company  may be  interested,  or  contract  with or lend money to the
Company or otherwise act as fully and freely as though it were not Rights


<PAGE>


                                      -31-

Agent under this Agreement.  Nothing herein shall preclude the Rights Agent from
acting in any other capacity for the Company or for any other legal entity.

         (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  Company  resulting  from any such  act,  default,
neglect or misconduct;  provided,  however, reasonable care was exercised 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
there shall be reasonable  grounds for believing that repayment of such funds or
adequate  indemnification  against  such  risk or  liability  is not  reasonably
assured to it.

         (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 purchase,  as the case may be, has either not
been  completed  or  indicates  an  affirmative  response  to  clause 1 and/or 2
thereof, the Rights Agent shall not take any further action with respect to such
requested exercise or transfer without first consulting with the Company.

         Section 21. Change of Rights  Agent.  The Rights Agent or any successor
Rights Agent may resign and be discharged  from its duties under this  Agreement
upon 30 days'  notice in writing  mailed to the  Company,  and to each  transfer
agent of the Common Stock and Preferred  Stock, by registered or certified mail,
and to the holders of the Rights  Certificates by first-class  mail. The Company
may remove the Rights Agent or any  successor  Rights Agent upon 30 days' notice
in writing,  mailed to the Rights Agent or successor  Rights Agent,  as the case
may be, and to each transfer agent of the Common Stock and Preferred  Stock,  by
registered or certified  mail, and to the holders of the Rights  Certificates by
first-class  mail.  If the  Rights  Agent  shall  resign or be  removed or shall
otherwise become  incapable of acting,  the Company shall appoint a successor to
the Rights Agent.  If the Company shall fail to make such  appointment  within a
period  of 30 days  after  giving  notice of such  removal  or after it has been
notified  in writing of such  resignation  or  incapacity  by the  resigning  or
incapacitated  Rights Agent or by the holder of a Rights Certificate (who shall,
with such notice,  submit his Rights Certificate for inspection by the Company),
then any registered  holder of any Rights  Certificate may apply to any court of
competent  jurisdiction  for  the  appointment  of a  new  Rights  Agent.  If no
successor   Rights  Agent  shall  have  been  appointed   within  30  days  from
effectiveness  of such removal or resignation,  and no registered  holder of any
Rights  Certificates  has applied pursuant to this Agreement for the appointment
of a new  Rights  Agent,  the  Company  shall  be  automatically  designated  as
successor  Rights Agent. Any successor  Rights Agent,  whether  appointed by the
Company  or by such a court,  shall be (a) a  corporation  organized  and  doing
business  under the laws of the  United  States  or of any  state of the  United
States so long as such  corporation  is  authorized  to do business as a banking
institution in such state, is in good standing, is authorized under such laws to
exercise  corporate  trust powers,  is subject to  supervision or examination by
federal  or state  authority  and has at the time of its  appointment  as Rights
Agent a


<PAGE>


                                      -32-

combined  capital and surplus of at least  $100,000,000 or (b) an Affiliate of a
corporation  described in clause (a) of this sentence.  After  appointment,  the
successor Rights Agent shall be vested with the same powers,  rights, duties and
responsibilities  as if it had been  originally  named as Rights  Agent  without
further act or deed; but the predecessor Rights Agent shall deliver and transfer
to the successor  Rights Agent any property at the time held by it hereunder and
shall  execute  and  deliver  any  further  assurance,  conveyance,  act or deed
necessary  for the  purpose.  Not  later  than  the  effective  date of any such
appointment,  the  Company  shall  file  notice  thereof  in  writing  with  the
predecessor  Rights  Agent and each  transfer  agent of the Common Stock and the
Preferred  Stock and shall mail a notice  thereof  in writing to the  registered
holders of the Rights  Certificates.  Failure to give any notice provided for in
this Section 21, however,  or any defect therein,  shall not affect the legality
or validity of the resignation or removal of the Rights Agent or the appointment
of the successor Rights Agent, as the case may be.

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

         Section 23.  Redemption and Termination.

         (a) The Board may (following the Stock  Acquisition Date, only with the
concurrence of a majority of the Continuing  Directors),  at its option,  at any
time prior to the earlier of (i) the Close of Business on the tenth Business Day
following the Stock  Acquisition  Date (or, if the Stock  Acquisition Date shall
have  occurred  prior to the Record  Date,  the Close of  Business  on the tenth
Business  Day  following  the Record  Date) or (ii) the Final  Expiration  Date,
direct the Company to, and if so directed, the Company shall, 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").
Notwithstanding anything contained in this Agreement to the contrary, the Rights
shall not be exercisable after the first occurrence of a Section 11(a)(ii) Event
until such time as the Company's right of redemption hereunder has expired.


<PAGE>


                                      -33-

The Company  may, at its option,  pay the  Redemption  Price in cash,  shares of
Common  Stock of the Company  (based on the Current  Market  Price of the Common
Stock at the time of  redemption)  or any  other  form of  consideration  deemed
appropriate by the Board.

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

         Section 24.  Notice of Certain Events.

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


<PAGE>


                                      -34-


         (b) In case any of the  events set forth in  Section  11(a)(ii)  hereof
shall  occur,  then,  in any  such  case,  (i)  the  Company  shall  as  soon as
practicable  thereafter  give to each  holder  of a Rights  Certificate,  to the
extent  feasible  and in  accordance  with  Section 25  hereof,  a notice of the
occurrence of such event,  which shall specify the event and the consequences of
the event to holders of Rights  under  Section  11(a)(ii)  hereof,  and (ii) all
references  in the  preceding  paragraph  to  Preferred  Stock  shall be  deemed
thereafter to refer to Common Stock of the Company and/or, if appropriate, other
securities.

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

                  Enterprise Bancorp, Inc.
                  222 Merrimack Street
                  Lowell, Massachusetts  01852
                  Attention: President

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

                  Enterprise Bank and Trust Company
                  222 Merrimack Street
                  Lowell, Massachusetts  01852
                  Attention: President

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

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


<PAGE>


                                      -35-

hereunder (which  shortening or lengthening,  after the Stock  Acquisition Date,
shall require the  concurrence  of a majority of such  Continuing  Directors) or
(iv) to change or supplement  the  provisions  hereunder in any manner which the
Company may deem necessary or desirable and which shall not adversely affect the
interests of the holders of Rights  Certificates (other than an Acquiring Person
or an Affiliate or Associate of any such Person);  provided,  this Agreement may
not be  supplemented  or amended to  lengthen,  pursuant to clause (iii) of this
sentence  (A) a time  period  relating  to when the Rights may be redeemed or to
modify the  ability  (or  inability  of the Board  (with,  where  required,  the
concurrence of a majority of the Continuing  Directors) to redeem the Rights, in
either case at such time as the Rights are not then  redeemable or (B) any other
time periods unless such lengthening is for the purpose of protecting, enhancing
or  clarifying  the rights of,  and/or the  benefits  to, the  holders of Rights
(other  than an  Acquiring  Person  or an  Affiliate  or  Associate  of any such
Person).  Upon the delivery of a certificate from an appropriate  officer of the
Company which states that the proposed  supplement or amendment is in compliance
with  the  terms of this  Section  26,  the  Rights  Agent  shall  execute  such
supplement or amendment. Notwithstanding anything contained in this Agreement to
the  contrary,  no  supplement  or  amendment  shall be made which  changes  the
Redemption Price, the Final Expiration Date, the Purchase Price or the number of
one  one-hundredths  of a  share  of  Preferred  Stock  for  which  a  Right  is
exercisable.  Prior to the  Distribution  Date,  the interests of the holders of
Rights shall be deemed  coincident  with the  interests of the holders of Common
Stock of the Company.

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

         Section  28.  Determinations  and  Actions by the Board,  etc.  For all
purposes of this  Agreement,  any  calculation of the number of shares of Common
Stock of the Company outstanding at any particular time,  including for purposes
of determining the particular  percentage of such  outstanding  shares of Common
Stock of the Company 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.  The  Board  (with,   where
specifically provided for herein, the concurrence of Continuing Directors) shall
have the  exclusive  power and  authority to  administer  this  Agreement and to
exercise all rights and powers  specifically  granted to the Board (with,  where
specifically provided for herein, the concurrence of Continuing Directors) or to
the Company,  or as may be necessary or advisable in the  administration of this
Agreement  including,  without limitation,  the right and power to (a) interpret
the  provisions  of  this  Agreement  and (b)  make  all  determinations  deemed
necessary or advisable for the  administration  of this  Agreement  (including a
determination to redeem or not redeem the Rights or to amend the 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 (with, where specifically provided for herein, the
concurrence  of Continuing  Directors),  the Continuing  Directors,  the Outside
Directors  or the  Company in good  faith,  shall (x) be final,  conclusive  and
binding on the  Company,  the Rights  Agent,  the  holders of the Rights and all
other parties and (y) not


<PAGE>


                                      -36-

subject the Board,  the  Continuing  Directors  or the Outside  Directors to any
liability to the holders of the Rights.

         Section 29.  Exchange.

         (a) The Board (with the  concurrence of the Continuing  Directors) may,
at its  option,  at any time  after 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 void  pursuant to the  provision of Section
7(e) hereof) for shares of Common  Stock of the Company at an exchange  ratio of
one share of Common  Stock of the Company 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  Board  shall  not be
empowered  to effect such  exchange at any time after any Person  (other than an
Exempt  Person)  becomes  the  Beneficial  Owner of 50% or more of the shares of
Common Stock of the Company then outstanding.

         (b)  Immediately  upon the action of the Board ordering the exchange of
any Rights  pursuant to paragraph (a) of this Section 29 and without any further
action and without notice, the right to exercise such Rights shall terminate and
the only right  thereafter  of a holder of such Rights  shall be to receive that
number  of shares of Common  Stock of the  Company  equal to the  number of such
Rights held by such holder  multiplied by the Exchange Ratio.  The Company shall
promptly give public notice 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 Company 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 or, prior to the  Distribution  Date, on
the registry books of the Transfer Agent for the Common Stock.  Any notice which
is mailed in the manner herein  provided  shall be deemed given,  whether or not
the holder  receives  the notice.  Each such  notice of exchange  will state the
method by which the  exchange  of the shares of Common  Stock of the Company for
Rights will be effected and, in the event of any partial exchange, the number of
Rights which will be exchanged.  Any partial exchange shall be affected pro rata
based on the number of Rights (other than Rights which have become void pursuant
to the provisions of Section 7(e) hereof) held by each holder of Rights.

         (c) In any exchange  pursuant to this  Section 29, the Company,  at its
option, may substitute  Preferred Stock (or Equivalent  Preferred Stock, as such
term is defined  in  Section  11(b)  hereof)  for shares of Common  Stock of the
Company  exchangeable for Rights,  at the initial rate of one one-hundredth of a
share of  Preferred  Stock (or  Equivalent  Preferred  Stock)  for each share of
Common Stock of the Company, as appropriately  adjusted to reflect adjustment in
the voting rights of the Preferred  Stock pursuant to Exhibit A hereto,  so that
the  fraction of a share of Preferred  Stock  delivered in lieu of each share of
Common  Stock of the Company  shall have the same voting  rights as one share of
Common Stock of the Company.



<PAGE>


                                      -37-

         (d) In the event that there  shall not be  sufficient  shares of Common
Stock of the Company  issued but not  outstanding  or authorized but unissued to
permit any exchange of Rights as  contemplated  in accordance  with this Section
29, the Company  shall take all such  action as may be  necessary  to  authorize
additional  shares of Common Stock of the Company for issuance  upon exchange of
the Rights.

         (e) The Company  shall not be required to issue  fractions of shares of
Common  Stock  of the  Company  or to  distribute  certificates  which  evidence
fractional  shares of Common  Stock of the Company.  In lieu of such  fractional
shares of Common  Stock of the  Company,  there shall be paid to the  registered
holders of the Rights  Certificates  with regard to which such fractional shares
of Common  Stock of the Company  would  otherwise  be issuable an amount in cash
equal to the same  fraction  of the  current  market  value of a whole  share of
Common Stock of the Company. For the purposes of this Section 29(e), the current
market  value of a whole  share of  Common  Stock  of the  Company  shall be the
closing price of a share of Common Stock of the Company or, if unavailable,  the
appropriate  alternative  price (in each case as determined  pursuant to Section
11(d)(i) hereof) for the Trading Day immediately  prior to the date on which the
Board takes action ordering an exchange pursuant to this Section 29.

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

         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;
provided,  however,  that  notwithstanding  anything  in this  Agreement  to the
contrary, if any such term,  provision,  covenant or restriction is held by such
court or authority to be invalid,  void or unenforceable and the Board (with the
concurrence  of a majority of the Continuing  Directors)  determines in its good
faith  judgment that severing the invalid  language  from this  Agreement  would
adversely  affect  the  purpose  or  effect  of this  Agreement,  the  right  of
redemption  set forth in Section  23 hereof  shall be  reinstated  and shall not
expire until the Close of Business on the tenth  Business Day following the date
of such  determination  by the Board.  Without  limiting the  foregoing,  if any
provision of this Agreement  requiring that a determination be made by the Board
with  the  concurrence  of a  majority  of the  Continuing  Directors  or by the
Continuing  Directors  or the Outside  Directors is held by a court of competent
jurisdiction  or other  authority  to be invalid,  void or  unenforceable,  such
determination  shall then be made by the Board in accordance with applicable law
and the  Company's  Articles  of  Organization  (as the same may be amended  and
restated from time to time) and Bylaws.


<PAGE>


                                      -38-


         Section 32.  Governing Law. This Agreement,  each Right and each Rights
Certificate  issued  hereunder  shall be deemed to be a contract  made under the
laws of the Commonwealth of Massachusetts and shall for all purposes be governed
by and  construed in  accordance  with the laws of  Massachusetts  applicable to
contracts  made and to be performed  entirely  within  Massachusetts,  including
Massachusetts  principles  of  conflicts  of law.  The  rights and duties of the
Rights  Agent  hereunder  shall be governed by the laws of the  Commonwealth  of
Massachusetts, including its principles of conflicts of law.

         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.






                     [Remainder of Page Intentionally Blank]


<PAGE>


                                      -39-

         IN  WITNESS  WHEREOF,  the  parties  hereto  have  caused  this  Rights
Agreement  to be duly  executed  under seal as of the day and year  first  above
written.

Attest:                               ENTERPRISE BANCORP, INC.


By: /s/ Arnold S. Lerner              By: /s/ George L. Duncan
      Arnold S. Lerner                    George L. Duncan
      Vice Chairman and Clerk             Chairman and Chief Executive Officer


Attest:                               ENTERPRISE BANK AND TRUST COMPANY
                                      as Rights Agent


By: /s/ Arnold S. Lerner              By: /s/ Richard W. Main
      Arnold S. Lerner                    Richard W. Main
      Vice Chairman and Clerk             President and Chief Operating Officer


                                                        



                                                                 EXHIBIT A


                            ENTERPRISE BANCORP, INC.

             TERMS OF SERIES A JUNIOR PARTICIPATING PREFERRED STOCK


         The  following  is a  statement  of the terms  (including  preferences,
conversion or other  rights,  voting  powers,  restrictions,  limitations  as to
dividends,  qualifications, and terms or conditions of redemption) of the Series
A Junior Participating  Preferred Stock, par value $.01 per share, of Enterprise
Bancorp, Inc. (the "Company"):

         1.  Designation  and  Amount.  The  shares  of  such  series  shall  be
designated as "Series A Junior Participating Preferred Shares" and the number of
shares constituting such series shall be 50,000.

         2.  Dividends and Distributions.

                  (a) Subject to the prior and superior rights of the holders of
         any  shares of any  series of shares  of  preferred  stock  (generally,
         "Preferred  Shares")  ranking prior and superior to the Series A Junior
         Participating  Preferred Shares with respect to dividends (if any), the
         holders  of Series A Junior  Participating  Preferred  Shares  shall be
         entitled to receive, when, as and if declared by the Board of Directors
         of the Company (the  "Board") out of funds  legally  available  for the
         purpose,  dividends  payable in cash at such times as dividends,  other
         than dividends  payable in Common Shares (as defined herein),  are paid
         by the  Company to holders  of shares of the  common  stock,  par value
         $0.01 per share,  of the Company (the "Common  Shares"),  commencing on
         the first date on which such a dividend  is paid by the  Company to the
         holders of the Common Shares following the first issuance of a Series A
         Junior  Participating  Preferred Share or fraction  thereof.  Each such
         dividend payable on the Series A Junior Participating  Preferred Shares
         shall be in an amount per share (rounded to the nearest cent) equal to,
         subject to the  provision for  adjustment  hereinafter  set forth,  100
         times the  aggregate per share amount of all cash  dividends,  plus 100
         times the aggregate  per share amount  (payable in kind) of all noncash
         dividends  or other  distributions,  other than a  dividend  payable in
         Common Shares or a  subdivision  of the  outstanding  Common Shares (by
         reclassification or otherwise),  declared by the Board and then payable
         on the Common Shares.  In the event the Company shall at any time after
         January 13,  1998 (the  "Rights  Declaration  Date") (i)  declare any
         dividend on Common Shares payable in Common Shares,  (ii) subdivide the
         outstanding  Common  Shares or (iii)  combine  the  outstanding  Common
         Shares  into a  smaller  number of  shares,  then in each such case the
         amount  to which  holders  of Series A Junior  Participating  Preferred
         Shares were entitled  immediately  prior to such event  pursuant to the
         preceding  sentence shall be adjusted by  multiplying  such amount by a
         fraction,  the  numerator  of  which is the  number  of  Common  Shares
         outstanding


<PAGE>


                                       -2-

         immediately after such event and the denominator of which is the number
         of Common Shares that were outstanding immediately prior to such event.

                  (b) The Board shall declare a dividend or  distribution on the
         Series A Junior Participating Preferred Shares as provided in paragraph
         (a) above  immediately  after it declares a dividend or distribution on
         the Common Shares (other than a dividend payable in Common Shares).

                  (c)  Dividends  shall  begin to accrue  and be  cumulative  on
         outstanding  Series A Junior  Participating  Preferred  Shares from the
         date of issue of such shares.  Accrued but unpaid  dividends  shall not
         bear  interest.  Dividends  paid on the  Series A Junior  Participating
         Preferred  Shares  in an  amount  less  than the  total  amount of such
         dividends  at the time  accrued  and  payable on such  shares  shall be
         allocated pro rata on a  share-by-share  basis among all such shares at
         the  time  outstanding.  The  Board  may  fix a  record  date  for  the
         determination  of  holders of Series A Junior  Participating  Preferred
         Shares  entitled  to  receive  payment of a  dividend  or  distribution
         declared  thereon,  which  record  date  shall be not more than 60 days
         prior to the date fixed for the payment thereof.

         3.  Voting  Rights.  The  holders  of  Series  A  Junior  Participating
Preferred Shares shall have the following voting rights:

                  (a) Subject to the provision for  adjustment  hereinafter  set
         forth, each Series A Junior Participating Preferred Share shall entitle
         the holder  thereof to 100 votes on all matters  submitted to a vote of
         the  shareholders of the Company.  In the event that the Board shall at
         any time after the Rights  Declaration Date (i) declare any dividend on
         Common Shares payable in Common Shares,  (ii) subdivide the outstanding
         Common  Shares or (iii)  combine the  outstanding  Common Shares into a
         smaller  number of  shares,  then in each such case the number of votes
         per share to which holders of Series A Junior  Participating  Preferred
         Shares were entitled  immediately prior to such event shall be adjusted
         by multiplying  such number by a fraction the numerator of which is the
         number of Common Shares  outstanding  immediately  after such event and
         the  denominator  of which is the  number  of Common  Shares  that were
         outstanding immediately prior to such event.

                  (b) Except as otherwise provided herein or by law, the holders
         of Series A Junior  Participating  Preferred  Shares and the holders of
         Common Shares shall vote together as one class on all matters submitted
         to a vote of shareholders of the Company.

                  (c)  (i) If at any  time  dividends  on any  Series  A  Junior
                  Participating  Preferred  Shares  shall  be  in  arrears,  the
                  occurrence of such  contingency  shall mark the beginning of a
                  period (a "Default Period") which shall extend until such time
                  when  all  accrued  and  unpaid  dividends  for  all  previous
                  dividend  periods and for the current  dividend  period on all
                  Series   A  Junior   Participating   Preferred   Shares   then
                  outstanding shall have been declared and paid or set apart for
                  payment.  During each Default Period, all holders of Preferred
                  Shares (including holders of the Series A


<PAGE>


                                       -3-

                  Junior  Participating  Preferred  Shares)  with  dividends  in
                  arrears, voting as a class, irrespective of series, shall have
                  the right to elect two (2) Directors.

                           (ii) During any Default Period,  such voting right of
                  the holders of Series A Junior Participating  Preferred Shares
                  may  be  exercised  initially  at  a  special  meeting  called
                  pursuant to  subparagraph  (iii) of this Section 3(c) or at an
                  annual  meeting  of  shareholders,  and  thereafter  at annual
                  meetings of  shareholders,  provided  that neither such voting
                  right nor the  right of the  holders  of any  other  series of
                  Preferred Shares,  if any, to increase,  in certain cases, the
                  authorized  number of Directors shall be exercised  unless the
                  holders of ten  percent  (10%) in number of  Preferred  Shares
                  outstanding  shall be  present  in  person  or by  proxy.  The
                  absence of a quorum of the holders of Common  Shares shall not
                  affect the exercise by the holders of Preferred Shares of such
                  voting right. At any meeting at which the holders of Preferred
                  Shares shall  exercise such voting right  initially  during an
                  existing Default Period,  they shall have the right, voting as
                  a class,  to elect  Directors to fill up to two (2) vacancies,
                  if any,  in the  Board or, if such  right is  exercised  at an
                  annual  meeting,  to elect two (2)  Directors.  The holders of
                  Preferred Shares shall have the right to make such increase in
                  the number of  Directors  as shall be  necessary to permit the
                  election by them at any special  meeting of two (2) Directors.
                  After the holders of  Preferred  Shares  shall have  exercised
                  their  right to elect  Directors  in any  Default  Period  and
                  during the continuance of such period, the number of Directors
                  shall  not be  increased  or  decreased  except by vote of the
                  holders of Preferred  Shares as herein provided or pursuant to
                  the rights of any equity securities  ranking senior to or pari
                  passu with the Series A Junior Participating Preferred Shares,
                  if any.

                           (iii) Unless the holders of Preferred  Shares  shall,
                  during an existing Default Period,  have previously  exercised
                  their right to elect  Directors,  the Board may order,  or any
                  shareholder or  shareholders  owning in the aggregate not less
                  than ten percent (10%) of the total number of Preferred Shares
                  outstanding,  irrespective of series, may request, the calling
                  of a special meeting of the holders of Preferred Shares, which
                  meeting shall thereupon be called by the Board or the Chairman
                  and Chief Executive  Officer of the Company.  The Clerk of the
                  Company  shall give  notice of such  meeting and of any annual
                  meeting at which  holders of Preferred  Shares are entitled to
                  vote  pursuant  to this  paragraph  (c)(iii) to each holder of
                  record of Preferred Shares by mailing a copy of such notice to
                  him at his last  address  as the same  appears on the books of
                  the  Company.  Such  meeting  shall be  called  for a time not
                  earlier  than  fifteen (15) days and not later than sixty (60)
                  days  after  such  order or  request.  If such  meeting is not
                  called  within  sixty (60) days  after such order or  request,
                  such   meeting  may  be  called  on  similar   notice  by  any
                  shareholder or  shareholders  owning in the aggregate not less
                  than ten percent (10%) of the total number of Preferred Shares
                  outstanding.  Notwithstanding the provisions of this paragraph
                  (c)(iii),  no such special  meeting shall be called during the
                  period within sixty (60) days  immediately  preceding the date
                  fixed for the next annual meeting of the shareholders.


<PAGE>


                                       -4-

                           (iv) In any  Default  Period,  the  holders of Common
                  Shares shall continue to be entitled to elect the whole number
                  of  Directors  of the Company  until the holders of  Preferred
                  Shares  shall  have  exercised  their  rights to elect two (2)
                  Directors  voting  as a class,  after  the  exercise  of which
                  right,  (X)  the  Directors  so  elected  by  the  holders  of
                  Preferred   Shares  shall   continue  in  office  until  their
                  successors  shall have been  elected by such  holders or until
                  the expiration of the Default  Period,  and (Y) any vacancy in
                  the Board shall  (except as provided in  paragraph  (c)(ii) of
                  this  Section  3) be  filled  by  vote  of a  majority  of the
                  remaining Directors  theretofore elected by the holders of the
                  class of capital stock of the Company (i.e., the Common Shares
                  or the Preferred  Shares)  which  elected the Directors  whose
                  office shall have become vacant.  References in this paragraph
                  (c) to Directors  elected by the holders of a particular class
                  of the capital stock of the Company  shall  include  Directors
                  elected by such  Directors  to fill  vacancies  as provided in
                  clause (Y) of the foregoing sentence.

                           (v)  Immediately  upon the  expiration  of a  Default
                  Period,  (X) the right of the holders of Preferred Shares as a
                  class  to elect  Directors  shall  cease,  (Y) the term of any
                  Directors  elected  by the  holders of  Preferred  Shares as a
                  class shall  terminate,  and (Z) the number of Directors shall
                  be such  number  as may be  provided  for in the  Articles  of
                  Organization,  as may then be amended  and in  effect,  or the
                  By-Laws of the  Company,  irrespective  of any  increase  made
                  pursuant  to the  provisions  of  paragraph  (c)(ii)  of  this
                  Section  3 (such  number  being  subject,  however,  to change
                  thereafter  in any manner  provided by law, or in the Articles
                  of  Organization,  as may be amended from time to time, or the
                  By-Laws of the Company).  Any vacancies in the Board  effected
                  by the  provisions  of  clauses  (Y) and (Z) in the  preceding
                  sentence  may  be  filled  by  a  majority  of  the  remaining
                  Directors.

                  (d)  Except as set forth  herein,  holders  of Series A Junior
         Participating  Preferred Shares 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 Shares as set forth herein) for
         taking any corporate action.

         4.  Certain Restrictions.

                  (a) Whenever dividends or other  distributions  payable on the
         Series A Junior Participating Preferred Shares as provided in Section 2
         are in arrears,  thereafter and until all accrued and unpaid  dividends
         and  distributions,  whether  or  not  declared,  on  Series  A  Junior
         Participating  Preferred  Shares  outstanding  shall  have been paid in
         full, the Company shall not:

                           (i)  declare  or pay  dividends  on,  make any  other
                  distributions  on, or redeem or purchase or otherwise  acquire
                  for  consideration  any shares of capital stock of the Company
                  ranking  junior  (either as to dividends or upon  liquidation,
                  dissolution   or   winding   up)  to  the   Series   A  Junior
                  Participating Preferred Shares;


<PAGE>


                                       -5-


                           (ii)  declare or pay  dividends  on or make any other
                  distributions  on any shares of capital  stock of the  Company
                  ranking  on  a  parity   (either  as  to   dividends  or  upon
                  liquidation,  dissolution  or  winding  up) with the  Series A
                  Junior  Participating  Preferred  Shares except dividends paid
                  ratably on the Series A Junior Participating  Preferred Shares
                  and all such parity  shares of capital stock of the Company on
                  which dividends are payable or in arrears in proportion to the
                  total  amounts  to which  the  holders  of all such  shares of
                  capital stock are then entitled;

                           (iii)  redeem or  purchase or  otherwise  acquire for
                  consideration  shares of capital stock of the Company  ranking
                  on a  parity  (either  as to  dividends  or upon  liquidation,
                  dissolution   or   winding   up)  with  the  Series  A  Junior
                  Participating  Preferred  Shares provided that the Company may
                  at any time  redeem,  purchase or  otherwise  acquire any such
                  parity  shares of capital  stock in exchange for any shares of
                  capital stock ranking  junior  (either as to dividends or upon
                  dissolution, liquidation or winding up) to the Series A Junior
                  Participating Preferred Shares;

                           (iv) purchase or otherwise  acquire for consideration
                  any Series A Junior  Participating  Preferred  Shares,  or any
                  shares of  capital  stock of the  Company  ranking on a parity
                  with  the  Series  A Junior  Participating  Preferred  Shares,
                  except  pursuant to Section 8 hereof or in  accordance  with a
                  purchase  offer  made  in  writing  or  by   publication   (as
                  determined  by the Board) to all  holders of such  shares upon
                  such terms as the Board, after consideration of the respective
                  annual   dividend   rates  and  other   relative   rights  and
                  preferences  of  the  respective  series  and  classes,  shall
                  determine  in good  faith  will  result in fair and  equitable
                  treatment among the respective  series or classes of shares of
                  capital stock of the Company.

                  (b) The Company shall not permit any subsidiary of the Company
         to  purchase  or  otherwise  acquire  for  consideration  any shares of
         capital stock of the Company unless the Company could,  under paragraph
         (a) of this  Section 4,  purchase or  otherwise  acquire such shares at
         such time and in such manner.

         5.  Reacquired  Shares.  Any  Series A Junior  Participating  Preferred
Shares,  purchased or otherwise acquired by the Company in any manner whatsoever
shall be retired and cancelled promptly after the acquisition  thereof. All such
shares shall upon their  cancellation  become authorized but unissued  Preferred
Shares and may be  reissued  as part of a new series of  Preferred  Shares to be
created by resolution or resolutions of the Board, subject to the conditions and
restrictions on issuance set forth herein.

         6.  Liquidation, Dissolution or Winding Up.

                  (a) Upon any liquidation (voluntary or otherwise), dissolution
         or  winding up of the  Company,  no  distribution  shall be made to the
         holders  of shares  of  capital  stock of the  Company  ranking  junior
         (either as to dividends or upon liquidation, dissolution or winding


<PAGE>


                                       -6-

         up) to the  Series A Junior  Participating  Preferred  Shares,  unless,
         prior thereto, the holders of Series A Junior  Participating  Preferred
         Shares shall have received $7,500.00 per share, plus an amount equal to
         accrued and unpaid dividends and distributions thereon,  whether or not
         declared,  to the date of such payment (the "Liquidation  Preference").
         Following the payment of the full amount of the Liquidation Preference,
         no  additional  distributions  shall be made to the holders of Series A
         Junior  Participating  Preferred  Shares,  unless,  prior thereto,  the
         holders of Common  Shares shall have  received an amount per share (the
         "Common Adjustment") equal to the quotient obtained by dividing (i) the
         Liquidation  Preference by (ii) 100 (as  appropriately  adjusted as set
         forth in subparagraph (c) below to reflect such events as stock splits,
         stock dividends and recapitalization with respect to the Common Shares)
         (such number in clause (ii) immediately  above being referred to as the
         "Adjustment  Number").  Subject  to the  rights of any other  series of
         Preferred Shares then outstanding, if any, following the payment of the
         full amount of the Liquidation  Preference and the Common Adjustment in
         respect  of all  outstanding  shares of  Series A Junior  Participating
         Preferred Shares and Common Shares,  respectively,  holders of Series A
         Junior  Participating  Preferred Shares and holders of shares of Common
         Shares  shall  receive  their  ratable and  proportionate  share of the
         remaining  assets  to be  distributed  in the  ratio of the  Adjustment
         Number to one (1) with  respect to such  Series A Junior  Participating
         Preferred Shares and Common Shares, on a per share basis, respectively.

                  (b) In the  event,  however,  that  there  are not  sufficient
         assets   available  to  permit  payment  in  full  of  the  Liquidation
         Preference  and the  liquidation  preferences  of all  other  series of
         Preferred  Shares,  if any,  which  rank on a parity  with the Series A
         Junior Participating Preferred Shares, then such remaining assets shall
         be distributed  ratably to the holders of such parity  Preferred Shares
         (including  the  Series A Junior  Participating  Preferred  Shares)  in
         proportion to their respective liquidation  preferences.  In the event,
         however,  that  there are not  sufficient  assets  available  to permit
         payment  in full of the Common  Adjustment  after  satisfaction  of the
         liquidation preferences of all series of Preferred Shares, if any, then
         such remaining  assets shall be  distributed  ratably to the holders of
         Common Shares.

                  (c) In the  event  the  Company  shall at any time  after  the
         Rights  Declaration  Date (i)  declare any  dividend  on Common  Shares
         payable in Common Shares,  (ii) subdivide the outstanding Common Shares
         or (iii) combine the outstanding Common Shares into a smaller number of
         shares,  then in  each  such  case  the  Adjustment  Number  in  effect
         immediately  prior to such event shall be adjusted by multiplying  such
         Adjustment Number by a fraction the numerator of which is the number of
         Common  Shares  outstanding   immediately  after  such  event  and  the
         denominator of which is the number of shares of Common Shares that were
         outstanding immediately prior to such event.

         7. Consolidation, Merger, etc. In case the Company shall enter into any
consolidation,  merger,  combination  or other  transaction  in which the Common
Shares are exchanged for or changed into other stock or securities,  cash or any
other  property,  then in any  such  case  the  Series  A  Junior  Participating
Preferred Shares shall at the same time be similarly  exchanged or changed in an
amount per share (subject to the provision for adjustment hereinafter set forth)
equal to 100


<PAGE>


                                       -7-

times the aggregate  amount of shares,  securities,  cash or any other  property
(payable in kind), as the case may be, into which or for which each Common Share
is changed or  exchanged.  In the event the Company  shall at any time after the
Rights  Declaration  Date (i) declare any dividend on Common  Shares  payable in
Common Shares, (ii) subdivide the outstanding Common Shares or (iii) combine the
outstanding  Common  Shares into a smaller  number of Shares,  then in each such
case the amount set forth in the preceding sentence with respect to the exchange
or change of Series A Junior Participating Preferred Shares shall be adjusted by
multiplying  such amount by a fraction  the  numerator of which is the number of
Common Shares  outstanding  immediately  after such event and the denominator of
which is the number of Common Shares that were outstanding  immediately prior to
such event.

         8. Redemption. The Series A Junior Participating Preferred Shares shall
not be redeemable.

         9. Ranking.  The Series A Junior  Participating  Preferred Shares shall
rank  junior to all other  series of the  Company's  Preferred  Shares as to the
payment of dividends  and the  distribution  of assets,  unless the terms of any
such series shall provide otherwise.

         10. Amendment.  At such time as Series A Junior Participating Preferred
Shares are outstanding, the Articles of Organization of the Company shall not be
amended,  nor  shall  any  Articles  of  Amendment  thereto,  including  without
limitation any Certificate of Vote of Directors Establishing a Series of a Class
of Stock  pursuant to Section 26 of Chapter  156B of the  Massachusetts  General
Laws, be filed with the Massachusetts  Secretary of State or otherwise  amended,
in any manner which would materially alter or change the powers,  preferences or
special rights of the Series A Junior  Participating  Preferred  Shares so as to
affect them adversely  without the affirmative vote of the holders of a majority
or more of the outstanding Series A Junior Participating Preferred Shares voting
separately as a class.

         11. Fractional Shares.  Series A Junior Participating  Preferred Shares
may be issued in  fractions  of a share  which  shall  entitle  the  holder,  in
proportion  to such  holder's  fractional  shares,  to exercise  voting  rights,
receive  dividends,  participate  in  distributions  and have the benefit of all
other rights of a holder of Series A Junior Participating Preferred Shares.






                                                                       EXHIBIT B


                          SUMMARY OF RIGHTS TO PURCHASE
                            SHARES OF SERIES A JUNIOR
                          PARTICIPATING PREFERRED STOCK


         On January 13, 1998, the Board of Directors of Enterprise Bancorp, Inc.
(the  "Company")  declared a dividend  distribution of one right for each of the
Company's  outstanding  shares of common  stock,  par value  $.01 per share (the
"Common  Stock"),  to  holders  of  record of the  Common  Stock at the close of
business on January 20,  1998.  Each Right  entitles  the  registered  holder to
purchase from the Company one  one-hundredth  of a share of preferred stock, par
value $.01 per  share,  of the  Company  (the  "Preferred  Stock") or in certain
circumstances,  to  receive  cash,  property,  shares of  Common  Stock or other
securities of the Company,  at a purchase price of $75.00 per one  one-hundredth
of a share of Preferred Stock (the "Purchase Price"), subject to adjustment (the
"Rights").  The  description  and terms of the  Rights are set forth in a Rights
Agreement (the "Rights  Agreement")  between the Company and Enterprise Bank and
Trust Company, as Rights Agent.

         Initially, the Rights will be attached to all certificates representing
the shares of the  Common  Stock and no  separate  Rights  Certificates  will be
distributed.  The Rights  will  separate  from the shares of Common  Stock and a
Distribution  Date will occur upon the earlier of (i) 10 business  days (or such
later  date  as  the  Company's  Board  of  Directors  may  determine  before  a
Distribution Date occurs) following a public  announcement by the Company that a
person or group of affiliated or associated persons, with certain exceptions (an
"Acquiring  Person"),  has  acquired,  or has  obtained  the  right to  acquire,
beneficial  ownership of 10% or more of the  outstanding  shares of Common Stock
(the date of such announcement  being the "Stock  Acquisition  Date") or (ii) 10
business  days (or such  later  date as the  Company's  Board of  Directors  may
determine  before a Distribution  Date occurs)  following the  commencement of a
tender  offer or  exchange  offer  that  would  result in a person  becoming  an
Acquiring Person.

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

         The Rights are not  exercisable  until the  Distribution  Date and will
expire at the close of business on January 13, 2008, unless earlier redeemed or
exchanged by the Company as described below.

         As soon as practicable after the Distribution Date, Rights Certificates
will be mailed to  holders  of  record of shares of the  Common  Stock as of the
close of business on the Distribution Date


<PAGE>


                                       -2-

and, from and after the  Distribution  Date,  the separate  Rights  Certificates
alone will represent the Rights.

         In the event (a "Flip-In  Event") a Person becomes an Acquiring  Person
(except  pursuant to a tender or exchange  offer for all  outstanding  shares of
Common Stock at a price and on terms which a majority of the  Company's  Outside
Directors  (as  defined in the Rights  Agreement)  determines  to be fair to and
otherwise  in the best  interests of the Company and its  shareholders  (a "fair
offer")), each holder of a Right will thereafter have the right to receive, upon
exercise of such Right,  shares of Common  Stock (or, in certain  circumstances,
cash, property or other securities of the Company) having a Current Market Price
(as defined in the Rights  Agreement)  equal to two times the exercise  price of
the Right.  Notwithstanding  the  foregoing,  following  the  occurrence  of any
Flip-In Event, all Rights that are, or (under certain circumstances specified in
the Rights  Agreement) were,  beneficially  owned by any Acquiring Person (or by
certain related parties) will be null and void in the circumstances set forth in
the Rights  Agreement.  However,  Rights will not be  exercisable  following the
occurrence  of any  Flip-In  Event  until  such time as the Rights are no longer
redeemable by the Company as set forth below.

         For example,  at an exercise price of $75.00 per Right,  each Right not
owned by an Acquiring Person (or by certain related parties) following a Flip-In
Event would  entitle its holder to  purchase  $150.00  worth of shares of Common
Stock (or other  consideration,  as noted above) for $75.00.  Assuming  that the
shares of Common Stock had a Current  Market  Price of $25.00 at such time,  the
holder of each valid  Right  would be  entitled  to  purchase  six (6) shares of
Common Stock for $75.00.

         In the event (a  "Flip-Over  Event")  that, at any time on or after the
Stock  Acquisition  Date,  (i) the Company  shall take part in a merger or other
business combination  transaction (other than certain mergers that follow a fair
offer) and the  Company  shall not be the  surviving  entity or (ii) the Company
shall take part in a merger or other business  combination  transaction in which
the shares of Common Stock are changed or exchanged  (other than certain mergers
that  follow a fair  offer)  or (iii)  50% or more of the  Company's  assets  or
earning  power is sold or  transferred,  each holder of a Right  (except  Rights
which previously have been voided, as set forth above) shall thereafter have the
right to  receive,  upon  exercise,  a number of  shares of common  stock of the
acquiring  company having a Current Market Price equal to two times the exercise
price of the  Right.  Flip-In  Events  and  Flip-Over  Events  are  collectively
referred to as "Triggering Events."

         The Purchase Price payable and the number of shares of Preferred  Stock
(or the amount of cash, property 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  share  dividend  on,  or  a  subdivision,  combination  or
reclassification  of,  the  shares of  Preferred  Stock,  (ii) if holders of the
shares of Preferred  Stock are granted  certain  rights or warrants to subscribe
for shares of Preferred Stock or convertible securities at less than the Current
Market Price of the Preferred Stock or (iii) upon the distribution to holders of
shares of the Preferred Stock of evidences of indebtedness or assets  (excluding
regular  quarterly cash dividends) or of subscription  rights or warrants (other
than those referred to above).



<PAGE>

                                       -3-

         With certain  exceptions,  no adjustment in the Purchase  Price will be
required  until  cumulative  adjustments  amount to at least 1% of the  Purchase
Price. The Company is not required to issue  fractional  shares of the Preferred
Stock upon the exercise of any Right or Rights. In lieu thereof,  a cash payment
may be made, as provided in the Rights Agreement.

         At any time until 10  business  days  following  the Stock  Acquisition
Date, the Company may redeem the Rights in whole, but not in part, at a price of
$.01 per Right, payable, at the option of the Company, in cash, shares of Common
Stock  or  other   consideration  as  the  Board  of  Directors  may  determine.
Immediately  upon the  effectiveness  of the  action of the  Company's  Board of
Directors  ordering  redemption of the Rights, the Rights will terminate and the
only  right of the  holders  of  Rights  will be to  receive  the $.01 per Right
redemption price.

         Until a Right is exercised,  the holder thereof,  as such, will have no
rights as a shareholder of the Company, including, without limitation, the right
to vote or to receive  dividends.  While the distribution of the Rights will not
be taxable to shareholders or to the Company,  shareholders may,  depending upon
the  circumstances,  recognize  taxable  income upon the  occurrence of either a
Flip-In Event or a Flip-Over Event as described above.

         The terms of the Rights, other than key financial terms and the date on
which the Rights expire, may be amended by the Board of Directors of the Company
prior  to the  Distribution  Date.  Thereafter,  the  provisions  of the  Rights
Agreement  may be  amended by the Board of  Directors  only 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 and certain other  related  parties) or to shorten or lengthen
any time period under the Rights Agreement; provided, however, that no amendment
to lengthen the time period  governing  redemption shall be made at such time as
the Rights are not redeemable.

         A copy of the Rights  Agreement has been filed with the  Securities and
Exchange Commission as an Exhibit to a Registration  Statement on Form 8-A dated
January 14,  1998. A copy of the Rights  Agreement  is available  free of charge
from the Company or the Rights  Agent.  This summary  description  of the Rights
does not purport to be complete and is qualified in its entirety by reference to
the Rights Agreement, which is incorporated herein by reference.


                                                     



                                                                       EXHIBIT C

                          [Form of Rights Certificate]


Certificate No. R-                                               ________ Rights



NOT  EXERCISABLE  AFTER JANUARY 13, 2008 OR EARLIER IF REDEEMED BY THE COMPANY.
THE RIGHTS ARE SUBJECT TO REDEMPTION,  AT THE OPTION OF THE COMPANY, AT $.01 PER
RIGHT  ON  THE  TERMS  SET  FORTH  IN  THE  RIGHTS   AGREEMENT.   UNDER  CERTAIN
CIRCUMSTANCES, RIGHTS BENEFICIALLY OWNED BY AN ACQUIRING PERSON, OR AN AFFILIATE
OR  ASSOCIATE  OF AN  ACQUIRING  PERSON (AS SUCH TERMS ARE DEFINED IN THE RIGHTS
AGREEMENT),  AND ANY SUBSEQUENT  HOLDER OF SUCH RIGHTS MAY BECOME NULL AND VOID.
[THE RIGHTS  REPRESENTED  BY THIS RIGHTS  CERTIFICATE  ARE OR WERE  BENEFICIALLY
OWNED BY A PERSON  WHO WAS OR BECAME AN  ACQUIRING  PERSON  OR AN  AFFILIATE  OR
ASSOCIATE OF AN ACQUIRING PERSON.  ACCORDINGLY,  THIS RIGHTS CERTIFICATE AND THE
RIGHTS  REPRESENTED  HEREBY  MAY  BECOME  NULL  AND  VOID  IN THE  CIRCUMSTANCES
SPECIFIED IN SECTION 7(e) OF SUCH AGREEMENT.]1


                               Rights Certificate

                            ENTERPRISE BANCORP, INC.

         This certifies that  ______________,  or his or her 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 13, 1998 (the "Rights Agreement"),  by
and  between  Enterprise  Bancorp,   Inc.,  a  Massachusetts   corporation  (the
"Company"), and Enterprise Bank and Trust Company, a Massachusetts trust company
(the  "Rights  Agent"),  to purchase  from the Company at any time prior to 5:00
P.M.  (New York City time),  on January 13, 2008 at the office or offices of the
Rights Agent  designated  for such  purpose,  or at the office or offices of its
successors as Rights Agent, one  one-hundredth  of a fully paid,  nonassessable,
share of Series A Junior  Participating  Preferred  Stock,  par  value  $.01 per
share, of the Company (the "Preferred Stock"), or in certain  circumstances,  to
receive cash,  property,  Common Stock or other securities of the Company,  at a
purchase price of $75.00 (the "Purchase Price"), upon presentation and surrender
of this Rights Certificate with the Form of Election to

- --------
1        The  portion  of the  legend  in  brackets  shall be  inserted  only if
         applicable and shall replace the preceding sentence.



<PAGE>


                                       -2-

Purchase and related  Certificate duly executed.  The number of Rights evidenced
by this Rights  Certificate  (and the number of shares of Preferred  Stock which
may be purchased upon exercise  thereof) set forth above, and the Purchase Price
set forth above,  are the number of Rights and the Purchase  Price as of January
20, 1998,  respectively,  based on the Preferred  Stock as  constituted  at such
date.

         Upon the  occurrence  of a  Section  11(a)(ii)  Event  (as such term is
defined  in the  Rights  Agreement),  if the  Rights  evidenced  by this  Rights
Certificate are beneficially owned by (i) an Acquiring Person or an Associate or
Affiliate  of an  Acquiring  Person  (as such  terms are  defined  in the Rights
Agreement)  which is determined to have been involved in, caused or  facilitated
such Section  11(a)(ii) Event,  (ii) a transferee of any such Acquiring  Person,
Associate or Affiliate  who becomes a transferee  after such  Acquiring  Person,
Associate  or  Affiliate  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
such 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
and kind of shares of Preferred Stock (or the amount of cash,  property,  Common
Stock  or  other  securities)  deliverable  upon  such  exercise  of the  Rights
evidenced by this Rights  Certificate are subject to modification and adjustment
upon the  happening  of certain  events,  including  those  events  specified in
Section 11(a)(ii) and Section 13 of the Rights Agreement.

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

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

         Subject to the provisions of the Rights Agreement, the Rights evidenced
by this Certificate may be redeemed by the Company at a redemption price of $.01
per Right at any time prior to the  earlier of the close of  business on (i) the
tenth business day following the first date of public


<PAGE>


                                       -3-

announcement by the Company that an Acquiring  Person has become such (or if the
date of such  announcement  shall have occurred  prior to January 13, 1998, the
close of business on the tenth  business  day  following  January 13, 1998) and
(ii) the close of business on January 13, 2008.

         The Company is not  required to issue  fractional  shares of  Preferred
Stock  upon the  exercise  of any  Right or  Rights  evidenced  hereby.  In lieu
thereof, a cash payment may be made, as provided in the Rights Agreement.

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

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

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

Dated as of                          .

ATTEST:                                 ENTERPRISE BANCORP, INC.


________________________                 By __________________________
[Name]                                         [Name]
[Title]                                        [Title]


Countersigned:

ENTERPRISE BANK AND TRUST COMPANY


By:______________________
   Authorized Signature




<PAGE>


                                       -4-


                  [Form of Reverse Side of Rights Certificate]

                               FORM OF ASSIGNMENT

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


FOR VALUE RECEIVED_____________________________________________________________
hereby sells, assigns and transfers unto ______________________________________
_______________________________________________________________________________

                  (Please print name and address of transferee)
_______________________________________________________________________________
this Rights Certificate,  together with all rights,  title and interest therein,
and does hereby  irrevocably  constitute  and  appoint  _________  Attorney,  to
transfer the within Rights Certificate on the books of the within-named Company,
with full power of substitution.


Dated:



                                                   --------------------------
                                                   Signature


Signature Guaranteed:





<PAGE>


                                       -5-




                                   Certificate

                  The undersigned  hereby  certifies by checking the appropriate
boxes that:

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

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


Dated:



                                           -------------------------------
                                           Signature


Signature Guaranteed:


                                     NOTICE

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




<PAGE>


                                       -6-

                          FORM OF ELECTION TO PURCHASE

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

To:  ENTERPRISE BANCORP, INC.

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


Please insert social security
or other identifying number ___________________

_______________________________________________________________________________
                         (Please print name and address)

_______________________________________________________________________________

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

Please insert social security
or other identifying number ___________________


_______________________________________________________________________________
                         (Please print name and address)
_______________________________________________________________________________

_______________________________________________________________________________

Dated:

                                              -----------------------------
                                              Signature

Signature Guaranteed:




<PAGE>


                                       -7-

                                   Certificate

         The  undersigned  hereby  certifies by checking the  appropriate  boxes
that:

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

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

Dated:

                                               -----------------------------
                                               Signature

Signature Guaranteed:


                                     NOTICE

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


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