CONCENTRA CORP
8-A12G, 1997-05-06
PREPACKAGED SOFTWARE
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-A

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                              Concentra Corporation
             (Exact name of registrant as specified in its charter)


                 Delaware                                04-2827026
 (State of incorporation or organization)   (I.R.S. Employer Identification No.)

21 North Avenue, Burlington, Massachusetts               01803-3301
 (Address of principal executive offices)                (Zip Code)

If this Form relates to the registration of a class of debt securities and is
effective upon filing pursuant to General Instructions A.(c)(1), please check
the following box. / /

If this Form relates to the registration of a class of debt securities and is to
become effective simultaneously with the effectiveness of a concurrent
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

    Rights to Purchase
  Series A Participating                                      NASDAQ
Cumulative Preferred Stock

     Securities to be registered pursuant to Section 12(g) of the Act: None




                                       -1-


<PAGE>   2
Item 1.  Description of Registrant's Securities to be Registered.

         On April 21, 1997, the Board of Directors of Concentra Corporation (the
"Company") declared a dividend of one Right for each outstanding share of Common
Stock, par value $0.00001 per share, of the Company (the "Common Shares"). The
Rights will be issued to the holders of record of Common Shares outstanding on
April 24, 1997, and with respect to Common Shares issued thereafter until the
Distribution Date (as defined below) and, in certain circumstances, with respect
to Common Shares issued after the Distribution Date. Each Right, when it becomes
exercisable as described below, will entitle the registered holder to purchase
from the Company one one-thousandth (1/1000th) of a share of Series A
Participating Cumulative Preferred Stock, par value $0.01 per share, of the
Company (the "Preferred Shares") at a price of $30 (the "Purchase Price"). The
description and terms of the Rights are set forth in a Rights Agreement dated as
of April 24, 1997 (the "Rights Agreement"), between the Company and The First
National Bank of Boston, as Rights Agent (the "Rights Agent").

         Until the earlier of (i) such time as the Company learns that a person
or group (including any affiliate or associate of such person or group) has
acquired, or has obtained the right to acquire, beneficial ownership of more
than 20% of the outstanding Common Shares, other than pursuant to a Qualifying
Offer (as defined below) (such person or group being an "Acquiring Person"), or
(ii) such date, if any, as may be designated by the Board of Directors of the
Company following the commencement of, or first public disclosure of an intent
to commence, a tender or exchange offer for outstanding Common Shares which
could result in such person or group becoming the beneficial owner of more than
20% of the outstanding Common Shares, other than pursuant to a Qualifying Offer
(the earlier of such dates being called the "Distribution Date"), the Rights
will be evidenced by the certificates for Common Shares registered in the names
of the holders thereof (which certificates for Common Shares shall also be
deemed to be Right Certificates, as defined below) and not by separate Right
Certificates. Therefore, until the Distribution Date, the Rights will be
transferred with and only with the Common Shares.

         As soon as practicable following the Distribution Date, separate
certificates evidencing the Rights ("Right Certificates") will be mailed to
holders of record of the Common Shares as of the close of business on the
Distribution Date (and to each initial record holder of certain Common Shares
originally issued after the Distribution Date), and such separate Right
Certificates alone will thereafter evidence the Rights.

         The Rights are not exercisable until the Distribution Date and will
expire on April 24, 2007 (the "Expiration Date") unless earlier redeemed by the
Company as described below.

         The Number of Preferred Shares or other securities issuable upon
exercise of a Right,

                                       -2-


<PAGE>   3
the Purchase Price, the Redemption Price (as defined below) and the number of
Rights associated with each outstanding Common Share are all subject to
adjustment by the Board of Directors of the Company in the event of any change
in the Common Shares or the Preferred Shares, whether by reason of stock
dividends, stock splits, recapitalizations, mergers, consolidations,
combinations or exchanges of securities, split-ups, split-offs, spin-offs,
liquidation, other similar changes in capitalization, any distribution or
issuance of cash, assets, evidences of indebtedness or subscription rights,
options or warrants to holders of Common Shares or Preferred Shares, as the case
may be (other than distribution of the Rights or regular quarterly cash
dividends) or otherwise.

         The Preferred Shares are authorized to be issued in fractions which are
an integral multiple of one one-thousandth (1/1000th) of a Preferred Share. The
Company may, but is not required to, issue fractions of shares upon the exercise
of Rights, and, in lieu of fractional shares, the Company may issue certificates
or utilize a depository arrangement as provided by the terms of the Preferred
Shares and, in the case of fractions other than one one-thousandth (1/1000th) of
a Preferred Share or integral multiples thereof, may make a cash payment based
on the market price of such shares.

         At such time as there is an Acquiring Person, the Rights will entitle
each holder (other than such Acquiring Person (or any affiliate or associate of
such Acquiring Person)) of a Right to purchase, for the Purchase Price, that
number of one one-thousandths (1/1000ths) of a Preferred Share equivalent to the
number of Common Shares which at the time of such event would have a market
value of twice the Purchase Price.

         In the event the Company is acquired in a merger or other business
combination by an Acquiring Person or an associate or affiliate of an Acquiring
Person that is a publicly traded corporation or 50% or more of the Company's
assets or assets representing 50% or more of the Company's revenues or cash flow
are sold, leased, exchanged or otherwise transferred (in one or more
transactions) to an Acquiring Person or an associate or affiliate of an
Acquiring Person that is a publicly traded corporation, each Right will entitle
its holder (subject to the next paragraph) to purchase, for the Purchase Price,
that number of Common Shares of such corporation which at the time of the
transaction would have a market value of twice the Purchase Price. In the event
the Company is acquired in a merger or other business combination by an
Acquiring Person or an associate or affiliate of an Acquiring Person that is not
a publicly traded entity or 50% or more of the Company's revenues or cash flow
are sold, leased, exchanged or otherwise transferred (in one or more
transactions) to an Acquiring Person or an associate or affiliate of an
Acquiring Person that is not a publicly traded entity, each Right will entitle
its holder (subject to the next paragraph) to purchase, for the Purchase Price,
at such holder's option, (i) that number of shares of the surviving corporation
in the transaction with such entity (which surviving corporation could be the
Company) which at the time of the transaction would have a book value of twice
that

                                       -3-


<PAGE>   4
Purchase Price, (ii) that number of shares of such entity which at the time of
the transaction would have a book value of twice the Purchase Price or (iii) if
such entity has an affiliate which has publicly traded common shares, that
number of common shares of such affiliate which at the time of the transaction
would have a market value of twice the Purchase Price.

         Any Rights that are, at any time beneficially owned by an Acquiring
Person (or any affiliate or associate of an Acquiring Person) will be null and
void and nontransferable and any holder of any such Right (including any
purported transferee or subsequent holder) will be unable to exercise or
transfer any such Right.

         The Rights Plan will not apply to any Qualifying Offer. Accordingly,
the Rights will not become exercisable in the case of a tender offer that
constitutes a Qualifying Offer or of a merger or business combination
consummated in compliance with the requirements of a Qualifying Offer. The
Rights Plan defines a "Qualifying Offer" as an all-cash tender offer for all
outstanding Common Shares which meets the following requirements: (i) the person
or group making the tender offer must, prior to or upon commencing such offer,
have provided to the Company firm written commitments from responsible financial
institutions, which have been accepted by such person or group, to provide,
subject only to customary terms and conditions, funds for such offer which, when
added to the amount of cash and cash equivalents which such person or group then
has available and has irrevocably committed in writing to the Company to utilize
for purposes of the offer, will be sufficient to pay for all Common Shares
outstanding on a fully dilute basis pursuant to the offer and the second-step
transaction required by clause (v) below and all related expenses, together with
copies of all written materials prepared by such person or group for such
financial institutions in connection with obtaining such financing commitments;
(ii) such person or group must own, after consummating such offer, Common Shares
representing a majority of the then outstanding Common Shares; (iii) such offer
must in all events remain open for at least 45 business days and must be
extended for at least 20 business days after the last increase or permitted
decrease in the price offered and after any bona fide higher alternative offer
is made (except in certain limited circumstances set forth in the Rights
Agreement); (iv) such offer is accompanied by a written opinion, in customary
form, of a nationally recognized investment banking firm which is addressed to
the holders of Common Shares other than such person or group and states that the
price to be paid to such holders pursuant to the offer is fair from a financial
point of view to such holders and which includes any written presentation of
such firm showing the analysis and range of values underlying such conclusion;
and (v) prior to or upon commencing such offer, such person or group must
irrevocably commit in writing to the Company (x) to consummate promptly upon
completion of the offer a transaction or transactions whereby all remaining
Common Shares will be acquired at the same price per share paid pursuant to the
offer, subject only to the condition that the Board has granted any approvals
required to enable such person or group to consummate such transaction or
transactions without obtaining the vote of any other

                                       -4-


<PAGE>   5
stockholder, (y) that such person or group will not amend such offer to reduce
the per share price offered (except in certain limited circumstances set forth
in the Rights Agreement), change the form of consideration offered, or reduce
the number of shares being sought or in any other respect which is materially
adverse to the Company's stockholders, and (z) that such person or group will
not make any offer for any equity securities of the Company for six months after
commencement of the original offer if the original offer does not result in the
tender of the number of shares required to be purchased pursuant to clause (ii)
above, unless another tender offer by another party for all outstanding Common
Shares is commenced that (a) constitutes a Qualifying Offer or (b) is approved
by the Company's Board of Directors (in which event any new offer by such person
or group must be at a price no less than that provided for in such approved
offer).

         At any time prior to the earlier of (i) such time as a Person becomes
an Acquiring Person and (ii) the Expiration Date, the Board of Directors of the
Company may redeem the Rights in whole, but not in part, at a price (in cash or
Common Shares or other securities of the Company deemed by the Board of
Directors to be at least equivalent in value) of $0.001 per Right, subject to
adjustment as provided in the Rights Agreement (the "Redemption Price");
provided, however, that, for the 120-day period after any date of a change
(resulting from a proxy or consent solicitation) in a majority of the Board of
Directors of the Company in office at the commencement of such solicitation, the
Rights may only be redeemed if (A) there are directors then in office who were
in office at the commencement of such solicitation and (B) the Board of
Directors of the Company, with the concurrence of a majority of such directors
then in office, determines that such redemption is, in their judgment, in the
best interests of the Company and its stockholders.

         Immediately upon the action of the Board of Directors of the Company
electing to redeem the Rights, and without any further action and without any
notice, the right to exercise the Rights will terminate and the only right of
the holders of Rights will be to receive the Redemption Price.

         After there is an Acquiring Person, the Board of Directors may elect to
exchange each Right (other than Rights that shall have become null and void and
nontransferable as described above) for consideration per Right consisting of
one-half of the securities that would be issuable at such time upon the exercise
of one Right pursuant to the terms of the Rights Agreement.

         Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends.

         At any time prior to the Distribution Date, the Company may, without
the approval of

                                       -5-


<PAGE>   6
any holder of the Rights, supplement or amend any provision of the Rights
Agreement (including the date on which the Distribution Date shall occur, the
time during which the Rights may be redeemed or the terms of the Preferred
Shares), except that no supplement or amendment shall be made which reduces the
Redemption Price (other than pursuant to certain adjustments therein) or
provides for an earlier Expiration Date. However, during the 120-day period
after any date of a change (resulting from a proxy or consent solicitation) in a
majority of the Board of Directors of the Company in office at the commencement
of such solicitation, the Rights Agreement may be supplemented or amended only
if (A) there are directors then in office who were in office at the commencement
of such solicitation and (B) the Board of Directors of the Company, with the
concurrence of a majority of such directors then in office, determines that such
supplement or amendment is, in their judgment, in the best interests of the
Company and its stockholders.

         The Rights have certain anti-takeover effects. The Rights will cause
substantial dilution to a person or group that attempts to acquire the Company
without conditioning the offer on substantially all the Rights being acquired.
The Rights will not interfere with any merger or other business combination
pursuant to a Qualifying Offer or with a third party approved by the Board of
Directors of the Company since the Board of Directors of the Company may, at its
option, at any time prior to any person becoming an Acquiring Person, redeem all
but not less than all of the then outstanding Rights at the Redemption Price.

         A Registration Statement on Form 8-A with respect to the Rights has
been filed with the Securities and Exchange Commission. The Rights Agreement
specifying the terms of the Rights, the Certificate of Designation of the
Preferred Shares specifying the terms of the Preferred Shares (Exhibit A to the
Rights Agreement) and the form of Right Certificate (Exhibit B to the Rights
Agreement) are filed herewith as exhibits. The foregoing description of the
Rights does not purport to be complete and is qualified in its entirety by
reference to such exhibits, which are incorporated herein by reference.


Item 2.  Exhibits.

         The following exhibit is filed as part of this Registration Statement:

         1. Rights Agreement dated April 24, 1997 between the Company and The
         First National Bank of Boston, which includes as Exhibit A, Certificate
         of Designations, and as Exhibit B, Form of Right Certificate.




                                       -6-


<PAGE>   7
                                    SIGNATURE


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




                                      CONCENTRA CORPORATION


                                      By:/s/ Alex Braverman
                                         -----------------------------------
                                         Alex Braverman, Chief Financial Officer
                                             
Dated:  May 6, 1997




                                       -7-
<PAGE>   8
                                RIGHTS AGREEMENT

                           Dated as of April 24, 1997

                                     between

                              CONCENTRA CORPORATION

                                       and

                        THE FIRST NATIONAL BANK OF BOSTON

                                 as Rights Agent






                                       -8-


<PAGE>   9
         RIGHTS AGREEMENT, dated as of April 24, 1997, between Concentra
Corporation, a Delaware corporation (the "Company"), and The First National Bank
of Boston, a national banking association, as Rights Agent (the "Rights Agent").

         The Board of Directors of the Company has authorized and declared a
dividend of one Right (as hereinafter defined) for each share of Common Stock,
par value $0.00001 per share, of the Company (the "Common Stock") outstanding at
the Close of Business (as hereinafter defined) on April 24, 1997 (the "Record
Date"), and has authorized the issuance of one Right (as such number may
hereafter be adjusted pursuant to the provisions of this Rights Agreement) with
respect to each share of Common Stock that shall become outstanding between the
Record Date and the earliest of the Distribution Date, the Redemption Date or
the Expiration Date (as such terms are hereinafter defined); provided, however,
that Rights may be issued with respect to shares of Common Stock that shall
become outstanding after the Distribution Date and prior to the earlier of the
Redemption Date or the Expiration Date in accordance with the provisions of
Section 23. Each Right shall initially represent the right to purchase one
one-thousandths (1/1000) of a share of Series A Participating Cumulative
Preferred Stock, par value $0.01 per share, of the Company (the "Preferred
Shares"), having the powers, rights and preferences set forth in the Certificate
of Designation attached as Exhibit A.

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

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

         "Acquiring Person" shall mean any Person who or which, alone or
together with all Affiliates and Associates of such Person, shall be the
Beneficial Owner of more than 20% of the Common Shares then outstanding, but
shall not include (a) the Company, any Subsidiary of the Company, any employee
benefit plan of the Company or of any of its Subsidiaries, or any Person holding
Common Shares for or pursuant to the terms of any such employee benefit plan, or
(b) any such Person who became such a Beneficial Owner prior to the Record Date,
or (c) any such Person who has become such a Beneficial Owner solely because (i)
of a change in the aggregate number of Common Shares outstanding since the last
date on which such Person acquired Beneficial Ownership of any Common Shares or
(ii) it acquired such Beneficial Ownership in the good faith belief that such
acquisition would not (x) cause such Beneficial Ownership to exceed 20% of the
Common Shares then outstanding and such Person relied in good faith in computing
the percentage of its Beneficial Ownership on publicly filed reports or
documents of the Company which are inaccurate or out-of-date or (y) otherwise
cause a Distribution Date or the adjustment provided for in Section 11 (a) to
occur. Notwithstanding clause (c) of the prior sentence, if any Person that is
not an Acquiring

                                       -9-


<PAGE>   10
Person due to such clause (c) does not reduce its percentage of Beneficial
Ownership of Common Shares to 20% or less by the Close of Business on the fifth
Business Day after notice from the Company (the date of notice being the first
day) that such Person's Beneficial Ownership of Common Shares so exceeds 20%,
such Person shall, at the end of such five Business Day period, become an
Acquiring Person (and such clause (c) shall no longer apply to such Person). For
purposes of this definition, the determination whether any Person acted in "good
faith" shall be conclusively determined by the Board of Directors of the
Company, acting by a vote of those directors of the Company whose approval would
be required to redeem the Rights under Section 24.

         "Affiliate" and "Associate", when used with reference to any Person,
shall have the respective meanings ascribed to such terms in Rule 12b-2 of the
General Rules and Regulations under the Exchange Act, as in effect on the date
of this Rights Agreement.

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

                  (i) which such Person or any of such Person's Affiliates or
         Associates is deemed to "beneficially own" within the meaning of Rule
         13d-3 of the General Rules and Regulations under the Exchange Act, as
         in effect on the date of this Rights Agreement;

                  (ii) which such Person or any of such Person's Affiliates or
         Associates has (A) the right to acquire (whether such right is
         exercisable immediately or only after the passage of time) pursuant to
         any agreement, arrangement or understanding (written or oral), or upon
         the exercise of conversion rights, exchange rights, rights (other than
         the Rights), warrants or options, or otherwise; provided, however, that
         a Person shall not be deemed the Beneficial Owner of, or to
         beneficially own, or to have Beneficial Ownership of, 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 thereunder,
         or (B) the right to vote pursuant to any agreement, arrangement or
         understanding (written or oral); provided, however, that a Person shall
         not be deemed the Beneficial Owner of, or to beneficially own, any
         security if (1) the agreement, arrangement or understanding (written or
         oral) to vote such security arises solely from a revocable proxy or
         consent given to such Person in response to a public proxy or consent
         solicitation made pursuant to, and in accordance with, the applicable
         rules and regulations under the Exchange Act and (2) the beneficial
         ownership of such security is not also then reportable on Schedule 13D
         under the Exchange Act (or any comparable or successor report);


                                      -10-
<PAGE>   11
                  (iii) which are beneficially owned, directly or indirectly, by
         any other Person with which such Person or any of such Person's
         Affiliates or Associates has any agreement, arrangement or
         understanding (written or oral) for the purpose of acquiring, holding,
         voting (except pursuant to a revocable proxy as described in clause
         (ii)(B) of this definition) or disposing of any securities of the
         Company. Notwithstanding the foregoing, nothing contained in this
         definition shall cause a Person ordinarily engaged in business as an
         underwriter of securities to be the "Beneficial Owner" of, or to
         "beneficially own", any securities acquired in a bona fide firm
         commitment underwriting pursuant to an underwriting agreement with the
         Company.

         "Book Value", when used with reference to Common Shares issued by any
Person, shall mean the amount of equity of such Person applicable to each Common
Share, determined (i) in accordance with generally accepted accounting
principles in effect on the date as of which such Book Value is to be
determined, (ii) using all the consolidated assets and all the consolidated
liabilities of such Person on the date as of which such Book Value is to be
determined, except that no value shall be included in such assets for goodwill
arising from consummation of a business combination, and (iii) after giving
effect to (A) the exercise of all rights, options and warrants to purchase such
Common Shares (other than the Rights), and the conversion of all securities
convertible into such Common Shares, at an exercise or conversion price, per
Common Share, which is less than such Book Value before giving effect to such
exercise or conversion (whether or not exercisability or convertibility is
conditioned upon occurrence of a future event), (B) all dividends and other
distributions on the capital stock of such Person declared prior to the date as
of which such Book Value is to be determined and to be paid or made after such
date, and (C) any other agreement, arrangement or understanding (written or
oral), or transaction or other action prior to the date as of which such Book
Value is to be determined which would have the effect of thereafter reducing
such Book Value.

         "Business Combination" shall have the meaning set forth in Section
11(c)(I).

         "Business Day" shall mean each Monday, Tuesday, Wednesday, Thursday and
Friday which is not a day on which banking institutions in Boston, Massachusetts
are authorized or obligated by law or executive order to close.

         "Certificate of Designation" shall mean the Certificate of Designation
of Series A Participating Cumulative Preferred Stock setting forth the powers,
preferences, rights, qualifications, limitations and restrictions of such series
of Preferred Stock of the Company, a copy of which is attached as Exhibit A.

         "Close of Business" on any given date shall mean 5:00 p.m., Boston,
Massachusetts

                                      -11-


<PAGE>   12
time, on such date; provided, however, that, if such date is not a Business Day,
"Close of Business" shall mean 5:00 p.m., Boston, Massachusetts time, on the
next succeeding Business Day.

         "Common Shares", when used with reference to the Company prior to a
Business Combination, shall mean the shares of Common Stock of the Company or
any other shares of capital stock of the Company into which the Common Stock
shall be reclassified or changed. "Common Shares", when used with reference to
any Person (other than the Company prior to a Business Combination), shall mean
shares of capital stock of such Person (if such Person is a corporation) of any
class or series, or units of equity interests in such Person (if such Person is
not a corporation) of any class or series, the terms of which do not limit (as a
maximum amount and not merely in proportional terms) the amount of dividends or
income payable or on such class or series or the amount of assets on such class
or series upon any voluntary or involuntary liquidation, dissolution or winding
up of such Person and do not provide that such class or series is subject to
redemption at the option of such Person, or any shares of capital stock or units
of equity interests into which the foregoing shall be reclassified or changed;
provided, however, that, if at any time there shall be more than one such class
or series of capital stock or equity interests of such Person, "Common Shares"
of such Person shall include all such classes and series substantially in the
proportion of the total number of shares or other units of each such class or
series outstanding at such time.

         "Common Stock" shall have the meaning set forth in the introductory
paragraph of this Rights Agreement.

         "Company" shall have the meaning set forth in the heading of this
Rights Agreement; provided, however, that if there is a Business Combination,
"Company" shall have the meaning set forth in Section 11 (c) (III).

         The term "control" with respect to any Person shall mean the power to
direct the management and policies of such Person, directly or indirectly, by or
through stock ownership, agency or otherwise, or pursuant to or in connection
with an agreement, arrangement or understanding (written or oral) with one or
more other Persons by or through stock ownership, agency or otherwise and the
terms "controlling" and "controlled" shall have meanings correlative to the
foregoing.

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

         "Exchange Act" shall mean the Securities Exchange Act of 1934, as in
effect on the date in question, unless otherwise specifically provided.

         "Exchange Consideration" shall have the meaning set forth in Section
11(b)(I).

                                      -12-


<PAGE>   13
         "Expiration Date" shall have the meaning set forth in Section 7(a).

         "Major Part", when used with reference to the assets of the Company and
its Subsidiaries as of any date, shall mean assets (i) having a fair market
value aggregating 50% or more of the total fair market value of all the assets
of the Company and its Subsidiaries (taken as a whole) as of the date in
question, (ii) accounting for 50% or more of the total value (net of
depreciation and amortization) of all the assets of the Company and its
Subsidiaries (taken as a whole) as would be shown on a consolidated or combined
balance sheet of the Company and its Subsidiaries as of the date in question,
prepared in accordance with generally accepted accounting principles then in
effect, or (iii) accounting for 50% or more of the total amount of earnings
before interest, taxes, depreciation and amortization or revenues of the Company
and its Subsidiaries (taken as a whole) as would be shown on, or derived from, a
consolidated or combined statement of income of the Company and its Subsidiaries
for the period of 12 months ending on the last day of the Company's monthly
accounting period next preceding the date in question, prepared in accordance
with generally accepted accounting principles then in effect.

         "Market Value", when used with reference to Common Shares on any date,
shall be deemed to be the average of the daily closing prices, per share, of
such Common Shares for the period which is the shorter of (1) 30 consecutive
Trading Days immediately prior to the date in question or (2) the number of
consecutive Trading Days beginning on the Trading Day immediately after the date
of the first public announcement of the event requiring a determination of the
Market Value and ending on the Trading Day immediately prior to the record date
of such event; provided, however, that, in the event that the Market Value of
such Common Shares is to be determined in whole or in part during a period
following the announcement by the issuer of such Common Shares of any action of
the type described in Section 12(a) that would require an adjustment thereunder,
then, and in each such case, the Market Value of such Common Shares shall be
appropriately adjusted to reflect the effect of such action on the market price
of such Common Shares. The closing price for each Trading Day shall be the
closing price quoted on the composite tape for securities listed on the New York
Stock Exchange, or, if such securities are not quoted on such composite tape or
if such securities are not listed on such exchange, on the principal United
States securities exchange registered under the Exchange Act (or any recognized
foreign stock exchange) on which such securities are listed, or, if such
securities are not listed on any such exchange, the closing price quoted on the
Nasdaq National Market, or if such securities are not traded in such National
Market, the average of the closing bid and asked quotations with respect to a
share of such securities on such trading quotation system then in use, or if no
such quotations are available, the average of the closing bid and asked prices
as furnished by a professional market maker making a market in such securities
selected by the Board of Directors of the Company. If on any such Trading Day no
market maker is making a market in such securities, the closing price of such
securities on such Trading Day shall be deemed to be the

                                      -13-


<PAGE>   14
fair value of such securities as determined in good faith by the Board of
Directors of the Company (whose determination shall be described in a statement
filed with the Rights Agent and shall be binding on the Rights Agent, the
holders of Rights and all other Persons); provided, however, that for the
purpose of determining the closing price of the Preferred Shares for any Trading
Day on which there is no such market maker for the Preferred Shares the closing
price on such Trading Day shall be deemed to be the Formula Number (as defined
in the Certificate of Designation) times the closing price of the Common Shares
of the Company on such Trading Day.

         "Person" shall mean an individual, corporation, partnership, joint
venture, association, trust, unincorporated organization or other entity.

         "Preferred Shares" shall have the meaning set forth in the introductory
paragraph of this Rights Agreement. Any reference in this Rights Agreement to
Preferred Shares shall be deemed to include any authorized fraction of a
Preferred Share, unless the context otherwise requires.

         "Principal Party" shall mean the Surviving Person in a Business
Combination; provided, however, that, if such Surviving Person is a direct or
indirect Subsidiary of any other Person, "Principal Party" shall mean the Person
which is the ultimate parent of such Surviving Person and which is not itself a
Subsidiary of another Person. In the event ultimate control of such Surviving
Person is shared by two or more Persons, "Principal Party" shall mean that
Person that is immediately controlled by such two or more Persons.

         "Purchase Price" with respect to each Right shall mean $30, as such
amount may from time to time be adjusted as provided herein, and shall be
payable in lawful money of the United States of America. All references herein
to the Purchase Price shall mean the Purchase Price as in effect at the time in
question.

         "Record Date" shall have the meaning set forth in the introductory
paragraph of this Rights Agreement.

         "Redemption Date" shall have the meaning set forth in Section 24(a).

         "Redemption Price" with respect to each Right shall mean $0.001, as
such amount may from time to time be adjusted in accordance with Section 12. All
references herein to the Redemption Price shall mean the Redemption Price as in
effect at the time in question.

         "Registered Common Shares" shall mean Common Shares which are, as of
the date of consummation of a Business Combination, and have continuously been
for the 12 months immediately preceding such date, registered under Section 12
of the Exchange Act.

                                      -14-


<PAGE>   15
         "Right Certificate" shall mean a certificate evidencing a Right in
substantially the form attached as Exhibit B.

         "Rights" shall mean the rights to purchase Preferred Shares (or other
securities) as provided in this Rights Agreement.

         "Securities Act" shall mean the Securities Act of 1933, as in effect on
the date in question, unless otherwise specifically provided.

         "Subsidiary" shall mean a Person, at least a majority of the total
outstanding voting power (being the power under ordinary circumstances (and not
merely upon the happening of a contingency) to vote in the election of directors
of such Person (if such Person is a corporation) or to participate in the
management and control of such Person (if such Person is not a corporation)) of
which is owned, directly or indirectly, by another Person or by one or more
other Subsidiaries of such other Person or by such other Person and one or more
other Subsidiaries of such other Person.

         "Surviving Person" shall mean (1) the Person which is the continuing or
surviving Person in a consolidation or merger specified in Section 11(c)(1)(i)
or 11(c)(1)(ii) or (2) the Person to which the Major Part of the assets of the
Company and its Subsidiaries is sold, leased, exchanged or otherwise transferred
or disposed of in a transaction specified in Section 11 (c)(I)(iii); provided,
however, that, if the Major Part of the assets of the Company and its
Subsidiaries is sold, leased, exchanged or otherwise transferred or disposed of
in one or more related transactions specified in Section 11(c)(I)(iii) to more
than one Person, the "Surviving Person" in such case shall mean the Person that
acquired assets of the Company and/or its Subsidiaries with the greatest fair
market value in such transaction or transactions.

         "Trading Day" shall mean a day on which the principal national
securities exchange (or principal recognized foreign stock exchange, as the case
may be) on which any securities or Rights, as the case may be, are listed or
admitted to trading is open for the transaction of business or, if the
securities or Rights in question are not listed or admitted to trading on any
national securities exchange (or recognized foreign stock exchange, as the case
may be), a Business Day.

         SECTION 2. Appointment of Rights Agent. The Company hereby appoints the
Rights Agent to act as agent for the Company in accordance with the term and
conditions hereof, and the Rights Agent hereby accepts such appointment. The
Company may from time to time appoint one or more co-Rights Agents as it may
deem necessary or desirable upon ten (10) days' prior written notice to the
Rights Agent. The Rights Agent shall have no duty to supervise, and shall in no
event be liable for, the acts or omissions of any such co-Rights Agent (the
term "Rights Agent" being used herein to refer, collectively, to the Rights

                                      -15-


<PAGE>   16
Agent together with any such co-Rights Agents). In the event the Company
appoints one or more co-Rights Agents, the respective duties of the Rights Agent
and any co-Rights Agents shall be as the Company shall determine.

         SECTION 3.  Issue of Rights and Right Certificates.

         (a) One Right shall be associated with each Common Share outstanding on
the Record Date, each additional Common Share that shall become outstanding
between the Record Date and the earliest of the Distribution Date, the
Redemption Date or the Expiration Date and each additional Common Share with
which Rights are issued after the Distribution Date but prior to the earlier of
the Redemption Date or the Expiration Date as provided in Section 23; provided,
however, that, if the number of outstanding Rights are combined into a smaller
number of outstanding Rights pursuant to Section 12(a), the appropriate
fractional Right determined pursuant to such Section shall thereafter be
associated with each such Common Share.

         (b) Until the earlier of (i) such time as the Company learns that a
Person has become an Acquiring Person or (ii) the Close of Business on such
date, if any, as may be designated by the Board of Directors of the Company
following the commencement of, or first public disclosure of an intent to
commence, a tender or exchange offer by any Person (other than the Company, any
Subsidiary of the Company, any employee benefit plan of the Company or of any of
its Subsidiaries, or any Person holding Common Shares for or pursuant to the
terms of any such employee benefit plan) for outstanding Common Shares, if upon
consummation of such tender or exchange offer such Person could be the
Beneficial Owner of more than 20% of the outstanding Common Shares (the Close of
Business on the earlier of such dates being the "Distribution Dates"), (x) the
Rights will be evidenced by the certificates for Common Shares registered in the
names of the holders thereof and not by separate Right Certificates and (y) the
Rights, including the right to receive Right Certificates, will be transferable
only in connection with the transfer of Common Shares. As soon as practicable
after the Distribution Date, the Rights Agent will send, by first-class,
postage-prepaid mail, to each record holder of Common Shares as of the
Distribution Date, at the address of such holder shown on the records of the
Company, a Right Certificate evidencing one whole Right for each Common Share
(or for the number of Common Shares with which one whole Right is then
associated if the number of Rights per Common Share held by such record holder
has been adjusted in accordance with the provision in Section 3(a)). If the
number of Rights associated with each Common Share has been adjusted in
accordance with the provision in Section 3(a), at the time of distribution of
the Right Certificates the Company may make any necessary and appropriate
rounding adjustments so that Right Certificates representing only whole numbers
of Rights are distributed and cash is paid in lieu of any fractional Right in
accordance with Section 15(a). As of and after the Distribution Date, the Rights
will be evidenced solely by such Right Certificates.

                                      -16-


<PAGE>   17
         (c) With respect to any certificate for Common Shares, until the
earliest of the Distribution Date, the Redemption Date or the Expiration Date,
the Rights associated with the Common Shares represented by any such certificate
shall be evidenced by such certificate alone, the registered holders of the
Common Shares shall also be the registered holders of the associated Rights and
the surrender for transfer of any such certificate shall also constitute the
transfer of the Rights associated with the Common Shares represented thereby.

         (d) Certificates issued for Common Shares after the Record Date
(including, without limitation, upon transfer or exchange of outstanding Common
Shares), but prior to the earliest of the Distribution Date, the Redemption Date
or the Expiration Date, may have printed on, written on or otherwise affixed to
them the following legend:

                  This certificate also evidences and entitles the holder hereof
         to certain Rights as set forth in a Rights Agreement dated as of April
         24, 1997, as it may be amended from time to time (the "Rights
         Agreement"), between Concentra Corporation (the "Company") and The
         First National Bank of Boston, as Rights Agent (the "Rights Agent"),
         the terms of which are hereby incorporated herein by reference and a
         copy of which is on file at the principal executive 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 Rights Agent will
         mail to the holder of this certificate a copy of the Rights Agreement
         without charge after receipt of a written request therefor. Rights
         beneficially owned by Acquiring Persons or their Affiliates or
         Associates (as such terms are defined in the Rights Agreement) and by
         any subsequent holder of such Rights are null and void and
         nontransferable.

Notwithstanding this paragraph (d), the omission of a legend shall not affect
the enforceability of any part of this Rights Agreement or the rights of any
holder of Rights.

         SECTION 4. Form of Right Certificates. The Right Certificates (and the
form of election to purchase and form of assignment to be printed on the reverse
side thereof) shall be in substantially the form set forth as Exhibit B 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 Rights 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 Sections 7, 11 and 23, the Right Certificates, whenever issued,
shall be dated as of the Distribution Date, and on their face shall entitle the
holders thereof to purchase such number of Preferred Shares as shall be set
forth therein for the Purchase Price set forth therein, subject to adjustment
from time to time as herein provided.

                                      -17-


<PAGE>   18
         SECTION 5.  Execution, Countersignature and Registration.

         (a) The Right Certificates shall be executed on behalf of the Company
by the President or the Treasurer (whether preceded by any additional title) of
the Company, either manually or by facsimile signature, and have affixed thereto
the Company's seal or a facsimile thereof which shall be attested by the
Secretary or an Assistant Secretary of the Company, either manually or by
facsimile signature. The Right Certificates shall be manually countersigned by
the Rights Agent and shall not be valid or obligatory for any purpose unless so
countersigned. In case the officer of the Company who shall have signed any of
the Right Certificates shall cease to be such an officer of the Company before
countersignature by the Rights Agent and issuance and delivery by the Company,
such Right Certificates may nevertheless 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 Right Certificates had not ceased to be such an
officer of the Company; and any Right Certificate may be signed on behalf of the
Company by any person who, at the actual date of execution of such Right
Certificate, shall be a proper officer of the Company to sign such Right
Certificate, although at the date of execution of this Rights Agreement any such
person was not such an officer of the Company.

         (b) Following the Distribution Date, the Rights Agent will keep or
cause to be kept, at its office in Canton, Massachusetts, books for registration
and transfer of the Right Certificates issued hereunder. Such books shall show
the names and addresses of the respective holders of the Right Certificates, the
number of Rights evidenced by each of the Right Certificates, the certificate
number of each of the Right Certificates and the date of each of the Right
Certificates.

         SECTION 6. Transfer, Split-up, Combination and Exchange of Right
Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificates;
Uncertificated Rights.

         (a) Subject to the provisions of Sections 7(e) and 15, at any time
after the Distribution Date, and at or prior to the Close of Business on the
earlier of the Redemption Date or the Expiration Date, any Right Certificate or
Right Certificates may be transferred, split-up, combined or exchanged for
another Right Certificate or Right Certificates representing, in the aggregate,
the same number of Rights as the Right Certificate or Right Certificates
surrendered then represented. Any registered holder desiring to transfer,
split-up, combine or exchange any Right Certificate shall make such request in
writing delivered to the Rights Agent and shall surrender the Right Certificate
or Right Certificates to be transferred, split-up, combined or exchanged at the
principal office of the Rights Agent; provided, however, that neither the Rights
Agent nor the Company shall be obligated to take any action whatsoever with
respect to the transfer of any Right Certificate surrendered for transfer until
the registered holder shall have completed and signed the certification
contained

                                      -18-


<PAGE>   19
in the form of assignment on the reverse side of such Right Certificate and
shall have provided such additional evidence of the identity of the Beneficial
Owner (or former Beneficial Owner) or Affiliates or Associates thereof as the
Company shall reasonably request. thereupon the Rights Agent shall, subject to
Sections 7(e) and 15, countersign and deliver to the Person entitled thereto a
Right Certificate or Right 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 Right Certificates.

         (b) Upon receipt by the Company and the Rights Agent of evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation of
a valid Right Certificate, and, in case of loss, theft or destruction, of
indemnity or security reasonably satisfactory to them, and, at the Company's
request, 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 Right Certificate if mutilated, the Company will make a new
Right Certificate of like tenor and deliver such new Right Certificate to the
Rights Agent for delivery to the registered owner in lieu of the Right
Certificate so lost, stolen, destroyed or mutilated.

         (c) Notwithstanding any other provision hereof, the Company and the
Rights Agent may amend this Rights Agreement to provide for uncertificated
Rights in addition to or in place of Rights evidenced by Right Certificates.

         SECTION 7.  Exercise of Rights; Expiration Date of Rights.

         (a) Subject to Section 7(e) and except as otherwise provided herein
(including Section 11), each Right shall entitle the registered holder thereof,
upon exercise thereof as provided herein, to purchase for the Purchase Price, at
any time after the Distribution Date and at or prior to the earlier of (i) the
Close of Business on the 10th anniversary of the date of this Rights Agreement
(the Close of Business on such date being the "Expiration Date"), or (ii) the
Redemption Date, one one-thousandths (1/1000) of a Preferred Share, subject to
adjustment from time to time as provided in Sections 11 and 12.

         (b) The registered holder of any Right Certificate may exercise the
Rights evidenced thereby (except as otherwise provided herein) in whole or in
part at any time after the Distribution Date, upon surrender of the Right
Certificate, with the form of election to purchase on the reverse side thereof
duly executed, to the Rights Agent at the office of the Rights Agent in Canton,
Massachusetts (or at such other location as the Rights Agent may designate),
together with payment of the Purchase Price for each one one-thousandths
(1/1000) of a Preferred Share as to which the Rights are exercised, at or prior
to the earlier of (i) the Expiration Date or (ii) the Redemption Date.

                                      -19-


<PAGE>   20
         (c) Upon receipt of a Right Certificate representing exercisable
Rights, with the form of election to purchase duly executed, accompanied by
payment of the Purchase Price for the Preferred Shares to be purchased together
with an amount equal to any applicable transfer tax, in lawful money of the
United States of America, in cash or by certified check or money order payable
to the order of the Company, the Rights Agent shall thereupon (i) either (A)
promptly requisition from any transfer agent of the Preferred Shares (or make
available, if the Rights Agent is the transfer agent) certificates for the
number of Preferred Shares 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 Preferred Shares with a depositary
agent under a depositary arrangement, promptly requisition from the depositary
agent depositary receipts representing the number of one one-thousandths
(1/1000) of a Preferred Share to be purchased (in which case certificates for
the Preferred Shares to be 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 all such requests, (ii) when appropriate,
promptly requisition from the Company the amount of cash to be paid in lieu of
issuance of fractional shares in accordance with Section 15, (iii) promptly
after receipt of such certificates or depositary receipts, cause the same to be
delivered to or upon the order of the registered holder of such Right
Certificate, registered in such name or names as may be designated by such
holder and (iv) when appropriate, after receipt promptly deliver such cash to or
upon the order of the registered holder of such Right Certificate.

         (d) In case the registered holder of any Right Certificate shall
exercise fewer than all the Rights evidenced thereby, a new Right Certificate
evidencing Rights equivalent to the Rights remaining unexercised shall be issued
by the Rights Agent and delivered to the registered holder of such Right
Certificate or to his duly authorized assigns, subject to the provisions of
Section 15.

         (e) Notwithstanding anything in this Rights Agreement to the contrary,
any Rights that are at any time beneficially owned by an Acquiring Person or any
Affiliate or Associate of an Acquiring Person shall be null and void and
nontransferable, and any holder of any such Right (including any purported
transferee or subsequent holder) shall not have any right to exercise or
transfer any such Right.

         (f) Notwithstanding anything in this Rights 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 Right Certificates upon the
occurrence of any purported exercise as set forth in this Section 7 unless such
registered holder shall have (i) completed and signed the certificate contained
in the form of election to purchase set forth on the reverse side of the Right
Certificate surrendered for such exercise and (ii) provided such additional
evidence of the identity of the Beneficial Owner (or former Beneficial Owner) or
Affiliates or

                                      -20-


<PAGE>   21
Associates thereof as the Company shall reasonably request.

         (g) The Company may temporarily suspend, for a period of time not to
exceed 10 calendar days after the Distribution Date, the exercisability of the
Rights in order to prepare and file a registration statement under the
Securities Act, on appropriate form, with respect to the Preferred Shares
purchasable upon exercise of the Rights and permit such registration statement
to become effective; provided, however, that no such suspension shall remain
effective after, and the Rights shall without any further action by the Company
or any other Person become exercisable immediately upon, the effectiveness of
such registration statement. Upon any such suspension, the Company shall issue a
public announcement stating that the exercisability of the Rights has been
temporarily suspended and shall issue a further public announcement at such time
as the suspension is no longer in effect. Notwithstanding any provision herein
to the contrary, the Rights shall not be exercisable in any jurisdiction if the
requisite qualification under the blue sky or securities laws of such
jurisdiction shall not have been obtained or the exercise of the Rights shall
not be permitted under applicable law.

         SECTION 8. Cancellation and Destruction of Right Certificates. All
Right Certificates surrendered or presented for the purpose of exercise,
transfer, split-up, combination or exchange shall, and any Right Certificate
representing Rights that have become null and void and nontransferable pursuant
to Section 7(e) surrendered or presented for any purpose shall, if surrendered
or presented to the Company or to any of its agents, be delivered to the Rights
Agent for cancellation or in canceled form, or, if surrendered or presented to
the Rights Agent, shall be canceled by it, and no Right Certificates shall be
issued in lieu thereof except as expressly permitted by this Rights Agreement.
The Company shall deliver to the Rights Agent for cancellation and retirement,
and the Rights Agent shall so cancel and retire, any Right Certificate purchased
or acquired by the Company. The Rights Agent shall deliver all canceled Right
Certificates to the Company, or shall, at the written request of the Company,
destroy such canceled Right Certificates, and in such case shall deliver a
certificate of destruction thereof to the Company.

         SECTION 9.  Reservation and Availability of Preferred Shares.

         (a) The Company covenants and agrees that it will cause to be reserved
and kept available out of its authorized and unissued Preferred Shares or any
authorized and issued Preferred Shares held in its treasury, free from
preemptive rights or any right of first refusal, a number of Preferred Shares
sufficient to permit the exercise in full of all outstanding Rights.

         (b) In the event that there shall not be sufficient Preferred Shares
issued but not outstanding or authorized but unissued to permit the exercise or
exchange of Rights in accordance with Section 11, the Company covenants and
agrees that it will take all such

                                      -21-


<PAGE>   22
action as may be necessary to authorize additional Preferred Shares for issuance
upon the exercise or exchange of Rights pursuant to Section 11; provided,
however, that if the Company is unable to cause the authorization of additional
Preferred Shares, then the Company shall, or in lieu of seeking any such
authorization, the Company may, to the extent necessary and permitted by
applicable law and any agreements or instruments in effect prior to the
Distribution Date to which it is a party, (A) upon surrender of a Right, pay
cash equal to the Purchase Price in lieu of issuing Preferred Shares and
requiring payment therefore, (B) upon due exercise of a Right and payment of the
Purchase Price for each Preferred Share as to which such Right is exercised,
issue equity securities having a value equal to the value of the Preferred
Shares which otherwise would have been issuable pursuant to Section 11, which
value shall be determined by a nationally recognized investment banking firm
selected by the Board of Directors, or (C) upon due exercise of a Right and
payment of the Purchase Price for each Preferred Share as to which such Right is
exercised, distribute a combination of Preferred Shares, cash and/or other
equity and/or debt securities having an aggregate value equal to the value of
the Preferred Shares which otherwise would have been issuable pursuant to
Section 11, which value shall be determined by a nationally recognized
investment banking firm selected by the Board of Directors. To the extent that
any legal or contractual restrictions (pursuant to agreements or instruments in
effect prior to the Distribution Date to which it is party) prevent the Company
from paying the full amount payable in accordance with the foregoing sentence,
the Company shall pay to holders of the Rights as to which such payments are
being made all amounts which are not then restricted on a pro rata basis as such
payments become permissible under such legal or contractual restrictions until
such payments have been paid in full.

         (c) The Company covenants and agrees that it will take all such action
as may be necessary to ensure that all Preferred Shares delivered upon exercise
or exchange of Rights shall, at the time of delivery of the certificates for
such Preferred Shares (subject to payment of the Purchase Price), be duly and
validly authorized and issued and fully paid and nonassessable shares.

         (d) So long as the Preferred Shares issuable upon the exercise or
exchange of Rights are to be listed on any national securities exchange, the
Company covenants and agrees to use its best efforts to cause, from and after
such time as the Rights become exercisable or exchangeable, all Preferred Shares
reserved for such issuance to be listed on such securities exchange upon
official notice of issuance upon such exercise or exchange.

         (e) The Company further covenants and agrees that it will pay when due
and payable any and all Federal and state transfer taxes and charges which may
be payable in respect of the issuance or delivery of Right Certificates or of
any Preferred Shares or Common Shares or other securities upon the exercise or
exchange of the Rights. The Company shall not, however, be required to pay any
transfer tax which may be payable in

                                      -22-


<PAGE>   23
respect of any transfer or delivery of Right Certificates to a Person other
than, or in respect of the issuance or delivery of certificates for the
Preferred Shares or Common Shares or other securities, as the case may be, in a
name other than that of, the registered holder of the Right Certificate
evidencing Rights surrendered for exercise or exchange or to issue or deliver
any certificates for Preferred Shares or Common Shares or other securities, as
the case may be, upon the exercise or exchange of any Rights until any such tax
shall have been paid (any such tax being payable by the holder of such Right
Certificate at the time of surrender) or until it had been established to the
Company's satisfaction that no such tax is due.

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

         SECTION 11. Adjustments in Rights After There Is an Acquiring Person;
Exchange of Rights for Shares; Business Combinations. (a) Upon a Person becoming
an Acquiring Person, proper provision shall be made so that each holder of a
Right, except as provided in Section 7(e), shall thereafter have a right to
receive, upon exercise thereof for the Purchase Price in accordance with the
terms of this Rights Agreement, such number of one one-thousandths (1/1000) of
a Preferred Share as shall equal the result obtained by multiplying the Purchase
Price by a fraction, the numerator of which is the number of one one-
thousandths (1/1000) of a Preferred Share for which a Right is then exercisable
and the denominator of which is 50% of the market value of the Common Shares on
the date on which a Person becomes an Acquiring Person. As soon as practicable
after a Person becomes an Acquiring Person (provided the Company shall not have
elected to make the exchange permitted by Section 11 (b)(I) for all outstanding
Rights), the Company covenants and agrees to use its best efforts to:

                  (I) prepare and file a registration statement under the
         Securities Act, on an appropriate form, with respect to the Preferred
         Shares purchasable upon exercise of the Rights;

                                      -23-


<PAGE>   24
                  (II) cause such registration statement to become effective as
         soon as practicable after such filing;

                  (III) cause such registration statement to remain effective
         (with a prospectus at all times meeting the requirements of the
         Securities Act) until the Expiration Date; and

                  (IV) qualify or register the Preferred Shares purchasable upon
         exercise of the Rights under the blue sky or securities laws of such
         jurisdictions as may be necessary or appropriate.

         (b)(I) The Board of Directors of the Company may, at its option, at any
time after a Person becomes an Acquiring Person, mandatorily exchange all or
part of the then outstanding and exercisable Rights (which shall not include
Rights that shall have become null and void and nontransferable pursuant to the
provisions of Section 7(e)) for consideration per Right consisting of one-half
of the securities that would be issuable at such time upon the exercise of one
Right in accordance with Section 11 (a) or, if applicable, Section 9(b) (the
consideration issuable per Right pursuant to this Section 11(b)(I) being the
"Exchange Consideration"). The Board of Directors of the Company may, at its
option, issue, in substitution for Preferred Shares, Common Shares in an amount
per Preferred Share equal to the Formula Number (as defined in the Certificate
of Designation) if there are sufficient Common Shares issued but not outstanding
or authorized but unissued. If the Board of Directors of the Company elects to
exchange all the Rights for Exchange Consideration pursuant to this Section 11
(b)(I) prior to the physical distribution of the Rights Certificates, the
Corporation may distribute the Exchange Consideration in lieu of distributing
Right Certificates, in which case for purposes of this Rights Agreement holders
of Rights shall be deemed to have simultaneously received and surrendered for
exchange Right Certificates on the date of such distribution.

         (II) Any action of the Board of Directors of the Company ordering the
exchange of any Rights pursuant to Section 11 (b)(I) shall be irrevocable and,
immediately upon the taking of such action and without any further action and
without any notice, the right to exercise any such Right pursuant to Section 11
(a) shall terminate and the only right thereafter of a holder of such Right
shall be to receive the Exchange Consideration in exchange for each such Right
held by such holder or, if the Exchange Consideration shall not have been paid
or issued, to exercise any such Right pursuant to Section 11 (c)(I). 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 holders of such Rights at their last addresses as they appear upon the
registry books of the Rights Agent. Any notice which is mailed in the manner
herein provided shall be deemed given, whether or not the holder receives the
notice.

                                      -24-


<PAGE>   25
Each such notice of exchange will state the method by which the exchange of the
Rights for the Exchange Consideration will be effected and, in the event of any
partial exchange, the number of Rights which will be exchanged. Any partial
exchange shall be effected pro rata based on the number of Rights (other than
Rights which shall have become null and void and nontransferable pursuant to the
provisions of Section 7(e)) held by each holder of Rights.

         (c)(I) In the event that, following a Distribution Date, directly or
indirectly, any transactions specified in the following clause (i), (ii) or
(iii) of this Section 11(c) (each such transaction being a "Business
Combination") shall be consummated:

                  (i) the Company shall consolidate with, or merge with and
         into, any Acquiring Person or any Affiliate or Associate of an
         Acquiring Person;

                  (ii) any Acquiring Person or any Affiliate or Associate of an
         Acquiring Person shall merge with and into the Company and, in
         connection with such merger, all or part of the Common Shares shall be
         changed into or exchanged for capital stock or other securities of the
         Company or of any Acquiring Person or Affiliate or Associate of an
         Acquiring Person or cash or any other property; or

                  (iii) the Company shall sell, lease, exchange or otherwise
         transfer or dispose of (or one or more of its Subsidiaries shall sell,
         lease, exchange or otherwise transfer or dispose of), in one or more
         transactions, the Major Part of the assets of the Company and its
         Subsidiaries (taken as a whole) to any Acquiring Person or any
         Affiliate or Associate of an Acquiring Person;

then, in each such case, proper provision shall be made so that each holder of a
Right, except as provided in Section 7(e), shall thereafter have the right to
receive, upon the exercise thereof for the Purchase Price in accordance with the
terms of this Rights Agreement, the securities specified below (or, at such
holder's option, the securities specified in Section 11(a)):

                           (A) If the Principal Party in such Business
         Combination has Registered Common Shares outstanding, each Right shall
         thereafter represent the right to receive, upon the exercise thereof
         for the Purchase Price in accordance with the terms of this Rights
         Agreement, such number of Registered Common Shares of such Principal
         Party, free and clear of all liens, encumbrances or other adverse
         claims, as shall have an aggregate Market Value equal to the result
         obtained by multiplying the Purchase Price by two;

                           (B) If the Principal Party involved in such Business
         Combination does not have Registered Common Shares outstanding, each
         Right shall thereafter

                                      -25-


<PAGE>   26
         represent the right to receive, upon the exercise thereof for the
         Purchase Price in accordance with the terms of this Rights Agreement,
         at the election of the holder of such Right at the time of the exercise
         thereof, any of:

                                    (1) such number of Common Shares of the
                  Surviving Person in such Business Combination as shall have an
                  aggregate Book Value immediately after giving effect to such
                  Business Combination equal to the result obtained by
                  multiplying the Purchase Price by two;

                                    (2) such number of Common Shares of the
                  Principal Party in such Business Combination (if the Principal
                  Party is not also the Surviving Person in such Business
                  Combination) as shall have an aggregate Book Value immediately
                  after giving effect to such Business Combination equal to the
                  result obtained by multiplying the Purchase Price by two; or

                                    (3) if the Principal Party in such Business
                  Combination is an Affiliate of one or more Persons which has
                  Registered Common Shares outstanding, such number of
                  Registered Common Shares of whichever of such Affiliates of
                  the Principal Party has Registered Common Shares with the
                  greatest aggregate Market Value on the date of consummation of
                  such Business Combination and shall have an aggregate Market
                  Value on the date of such Business Combination equal to the
                  result obtained by multiplying the Purchase Price by two.

         (III) The Company shall not consummate any Business Combination unless
each issuer of Common Shares for which Rights may be exercised, as set forth in
this Section 11 (C), shall have sufficient authorized Common Shares that have
not been issued or reserved for issuance (and which shall, when issued upon
exercise thereof in accordance with this Rights Agreement, be validly issued,
fully paid and nonassessable and free of preemptive rights, rights of first
refusal or any other restrictions or limitations on the transfer or ownership
thereof) to permit the exercise in full of the Rights in accordance with this
Section 11 (c) and unless prior thereto:

                  (i) a registration statement under the Securities Act on an
         appropriate form, with respect to the Rights and the Common Shares of
         such issuer purchasable upon exercise of the Rights, shall be effective
         under the Securities Act; and

                  (ii) the Company and each such issuer shall have:

                           (A) executed and delivered to the Rights Agent a
         supplemental agreement providing for the assumption by such issuer of
         the obligations set forth in

                                      -26-


<PAGE>   27
         this Section 11 (c) (including the obligation of such issuer to issue
         Common Shares upon the exercise of Rights in accordance with the terms
         set forth in Sections 11 (c)(1) and 11 (c)(III)) and further providing
         that such issuer, at its own expense, will use its best efforts to:

                           (1) cause a registration statement under the
                  Securities Act on an appropriate form, with respect to the
                  Rights and the Common Shares of such issuer purchasable upon
                  exercise of the Rights, to remain effective (with a prospectus
                  at all times meeting the requirements of the Securities Act)
                  until the Expiration Date;

                           (2) qualify or register the Rights and the Common
                  Shares of such issuer purchasable upon exercise of the Rights
                  under the blue sky or securities laws of such jurisdictions as
                  may be necessary or appropriate; and

                           (3) list the Rights and the Common Shares of such
                  issuer purchasable upon exercise of the Rights on each
                  national securities exchange on which the Common Shares were
                  listed prior to the consummation of the Business Combination
                  or, if the Common Shares were not listed on a national
                  securities exchange prior to the consummation of the Business
                  Combination, on a national securities exchange;

                           (B) furnished to the Rights Agent a written opinion
         of independent counsel stating that such supplemental agreement is a
         valid, binding and enforceable agreement of such issuer; and

                           (C) filed with the Rights Agent a certificate of a
         nationally recognized firm of independent accountants setting forth the
         number of Common Shares of such issuer which may be purchased upon the
         exercise of each Right after the consummation of such Business
         Combination.

         (IV) After consummation of any Business Combination and subject to the
provisions of Section 11 (c)(II), (i) each issuer of Common Shares for which
Rights may be exercised as set forth in this Section 11 (c) shall be liable for,
and shall assume, by virtue of such Business Combination, all the obligations
and duties of the Company pursuant to this Rights Agreement, (ii) the term
"Company" shall thereafter be deemed to refer to such issuer, (iii) each such
issuer shall take such steps in connection with such consummation as may be
necessary to assure that the provisions hereof (including the provisions of
Sections 11 (a) and 11 (c)) shall thereafter be applicable, as nearly as
reasonably may be, in relation to its Common Shares thereafter deliverable upon
the exercise of the Rights, and (iv) the number of Common Shares of each such
issuer thereafter receivable upon exercise of any Right shall

                                      -27-


<PAGE>   28
be subject to adjustment from time to time in a manner and on terms as nearly
equivalent as practicable to the provisions of Sections 11 and 12 and the
provisions of Section 7, 9 and 10 with respect to the Preferred Shares shall
apply, as nearly as reasonably may be, on like terms to any such Common Shares.

         SECTION 12.  Certain Adjustments.

         (a) To preserve the actual or potential economic value of the Rights,
if at any time after the date of this Rights Agreement there shall be any change
in the Common Shares or the Preferred Shares, whether by reason of stock
dividends, stock splits, recapitalizations, mergers, consolidations,
combinations or exchanges of securities, split-ups, split-offs, spin-offs,
liquidations, other similar changes in capitalization, any distribution or
issuance of cash, assets, evidences of indebtedness or subscription rights,
options or warrants to holders of Common Shares or Preferred Shares, as the case
may be (other than distribution of the Rights or regular quarterly cash
dividends) or otherwise, then, in each such event the Board of Directors of the
Company shall make such appropriate adjustments in the number of Preferred
Shares (or the number and kind of other securities) issuable upon exercise of
each Right, the Purchase Price and Redemption Price in effect at such time and
the number of Rights outstanding at such time (including the number of Rights or
fractional Rights associated with each Common Share) such that following such
adjustment such event shall not have had the effect of reducing or limiting the
benefits the holders of the Rights would have had absent such event.

         (b) If, as a result of an adjustment made pursuant to Section 12(a),
the holder of any Right thereafter exercised shall become entitled to receive
any securities other than Preferred Shares, thereafter the number of such
securities so receivable upon exercise of any Right shall be subject to
adjustment from time to time in a manner and on terms as nearly equivalent as
practicable to the provisions of Sections 11 and 12 and the provisions of
Sections 7, 9 and 10 with respect to the Preferred Shares shall apply, as nearly
as reasonably may be, on like terms to any such other securities.

         (c) All Rights originally issued by the Company subsequent to any
adjustment made to the amount of Preferred Shares or other securities relating
to a right shall evidence the right to purchase, for the Purchase Price, the
adjusted number and kind of securities purchasable from time to time hereunder
upon exercise of the Rights, all subject to further adjustment as provided
herein.

         (d) Irrespective of any adjustment or change in the Purchase Price or
the number of Preferred Shares or number or kind of other securities issuable
upon the exercise of the Rights, the Right Certificates theretofore and
thereafter issued may continue to express the terms which were expressed in the
initial Right Certificates issued hereunder.

                                      -28-
<PAGE>   29
         (e) In any case in which action taken pursuant to Section 12(a)
requires that an adjustment 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 issuing to the holder of any Right exercised after such record date
the Preferred Shares and/or other securities, if any, issuable upon such
exercise over and above the Preferred Shares and/or other securities, if any,
issuable before giving effect 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 securities upon the
occurrence of the event requiring such adjustment.

         SECTION 13. Certificate of Adjustment. Whenever an adjustment is made
as provided in Section 11 or 12, 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 Shares a copy of such certificate and (c)
mail a brief summary thereof to each holder of a Right Certificate (or, prior to
the Distribution Date, of the Common Shares) in accordance with Section 25. The
Rights Agent shall be fully protected in relying on any such certificate and on
any adjustment therein contained.

         SECTION 14.  Additional Covenants.

         (a) Notwithstanding any other provision of this Rights Agreement, no
adjustment to the number of Preferred Shares (or fractions of a share) or other
securities for which a Right is exercisable or the number of Rights outstanding
or associated with each Common Share or any similar or other adjustment shall be
made or be effective if such adjustment would have the effect of reducing or
limiting the benefits the holders of the Rights would have had absent such
adjustment, including, without limitation, the benefits under Sections 11 and
12, unless the terms of this Rights Agreement are amended go as to preserve such
benefits.

         (b) The Company covenants and agrees that, after the Distribution Date,
except as permitted by Section 26, it will not take (or permit any Subsidiary of
the Company to take) any action if at the time such action is taken it is
intended or reasonably foreseeable that such action will reduce or otherwise
limit the benefits the holders of the Rights would have had absent such action,
including, without limitation, the benefits under Sections 11 and 12. Any action
taken by the Company during any period after any Person becomes an Acquiring
Person but prior to the Distribution Date shall be null and void unless such
action could be taken under this Section 14(b) from and after the Distribution
Date. The Company shall not consummate any Business Combination if any issuer of
Common Shares for which Rights may be exercised after such Business Combination
in accordance with Section 11(c) shall have taken any action that reduces or
otherwise limits the benefits the holders of the Rights

                                      -29-


<PAGE>   30
would have had absent such action, including, without limitation, the benefits
under Sections 11 and 12.

         SECTION 15.  Fractional Rights and Fractional Shares.

         (a) The Company may, but shall not be required to, issue fractions of
Rights or distribute Right Certificates which evidence fractional Rights. In
lieu of such fractional Rights, the Company may pay to the registered holders of
the Right Certificates with regard to which such fractional Rights would
otherwise be issuable an amount in cash equal to the same fraction of the
current market value of a whole Right. For purposes of this Section 15(a), the
current market value of a whole Right shall be the closing price of the Rights
(as determined pursuant to the second and third sentences of the definition of
Market Value contained in Section 1) for the Trading Day immediately prior to
the date on which such fractional Rights would have been otherwise issuable.

         (b) The Company may, but shall not be required to, issue fractions of
Preferred Shares upon exercise of the Rights or distribute certificates which
evidence fractional Preferred Shares. In lieu of fractional Preferred Shares,
the Company may elect to (i) utilize a depository arrangement as provided by the
terms of the Preferred Shares or (ii) in the case of a fraction of a Preferred
Share (other than one one-thousandths (1/1000) of a Preferred Share or any
integral multiple thereof), pay to the registered holders of Right Certificates
at the time such Rights are exercised as herein provided an amount in cash equal
to the same fraction of the current market value of one Preferred Share, if any
are outstanding and publicly traded (or the Formula Number times the current
market value of one Common Share if the Preferred Shares are not outstanding and
publicly traded). For purposes of this Section 15(b), the current market value
of a Preferred Share (or Common Share) shall be the closing price of a Preferred
Share (or Common Share) (as determined pursuant to the second and third
sentences of the definition of Market Value contained in Section 11 for the
Trading Day immediately prior to the date of such exercise. If, as a result of
an adjustment made pursuant to Section 12(a), the holder of any Right thereafter
exercised shall become entitled to receive any securities other than Preferred
Shares, the provisions of this Section 15(b) shall apply, as nearly as
reasonably may be, on like terms to such other securities.

         (c) The Company may, but shall not be required to, issue fractions of
Common Shares upon exchange of Rights pursuant to Section 11 (b), or to
distribute certificates which evidence fractional Common Shares. In lieu of such
fractional Common Shares, the Company may pay to the registered holders of the
Right Certificates with regard to which such fractional Common Shares would
otherwise be issuable an amount in cash equal to the same fraction of the
current Market Value of one Common Share as of the date on which a Person became
an Acquiring Person.


                                      -30-


<PAGE>   31
         (d) The holder of Rights 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 provided in this Section 15.

         SECTION 16.  Rights of Action.

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

         (b) Any holder of Rights who prevails in an action to enforce the
provisions of this Rights Agreement shall be entitled to recover the reasonable
costs and expenses, including attorneys' fees, incurred in such action.

         SECTION 17.  Transfer and Ownership of Rights and Right Certificates.

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

         (b) After the Distribution Date, the Right Certificates will be
transferable, subject to Section 7(e), only on the registry books of the Rights
Agent if surrendered at the principal office of the Rights Agent, duly endorsed
or accompanied by a proper instrument of transfer.

         (c) The Company and the Rights Agent may deem and treat the Person in
whose name a Right Certificate (or, prior to the Distribution Date, the
associated Common Shares certificate) is registered as the absolute owner
thereof and of the Rights evidenced thereby (notwithstanding any notations of
ownership or writing on the Right Certificates or the associated certificate for
Common Shares made by anyone other than the Company or the Rights Agent) for all
purposes whatsoever, and neither the Company nor the Rights Agent shall be
affected by any notice to the contrary.

                                      -31-


<PAGE>   32
         SECTION 18. Right Certificate Holder Not Deemed a Stockholder. No
holder, as such, of any Right Certificate shall be entitled to vote or receive
dividends or be deemed, for any purpose, the holder of the Preferred Shares or
of any other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Right Certificate be construed to confer upon the holder of any Right
Certificate, as such, any of the rights of a stockholder of the Company,
including, without limitation, any right to vote for the election of directors
or upon any matter submitted to stockholders at any meeting thereof, or to give
or withhold consent to any corporate action, or to receive notice of meetings or
other actions affecting stockholders, or to receive dividends or other
distributions or subscription rights, or otherwise, until the Right or Rights
evidenced by such Right Certificate shall have been exercised in accordance with
the provisions hereof.

         SECTION 19.  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 other
disbursements incurred in the administration and execution of this Rights
Agreement and the exercise and performance of its duties hereunder.

         (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 Rights Agreement in reliance upon any Right
Certificate or certificate for the Common Shares or for other securities of the
Company, instrument of assignment or transfer, power of attorney, endorsement,
affidavit, letter, notice, direction, consent, certificate, statement, or other
paper or document believed by it to be genuine and to be signed, executed and,
where necessary, verified or acknowledged, by the proper Person or Persons.

         SECTION 20.  Merger or Consolidation or Change 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
stock transfer or corporate trust business of the Rights Agent or any successor
Rights Agent, shall be the successor to the Rights Agent under this Rights
Agreement without the execution or filing of any paper or any further act on the
part of any of the parties hereto; provided that such corporation would be
eligible for appointment as a successor Rights Agent under the provisions of
Section 22. In case, at the time such successor Rights Agent shall succeed to
the agency created by this Rights Agreement, any of the Right Certificates shall
have been countersigned but not delivered, any

                                      -32-


<PAGE>   33
such successor Rights Agent may adopt the countersignature of the predecessor
Rights Agent and deliver such Right Certificates so countersigned; and, in case
at that time any of the Right Certificates shall not have been countersigned,
any successor Rights Agent may countersign such Right Certificates either in the
name of the predecessor Rights Agent or in the name of the successor Rights
Agent; and in all such cases such Right Certificates shall have the full force
provided in the Right Certificates and in this Rights Agreement.

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

         SECTION 21. Duties of Rights Agent. The Rights Agent undertakes the
duties and obligations imposed by this Rights Agreement upon the following terms
and conditions, by all of which the Company and the holders of Right
Certificates (or, prior to the Distribution Date, of the Common Shares), 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, suffered or omitted by it in good faith and in accordance with such
opinion.

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

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

         (d) The Rights Agent shall not be liable for or by reason of any of the
statements

                                      -33-

<PAGE>   34
of fact or recitals contained in this Rights Agreement or in the Right
Certificates (except as to its countersignature thereof) or be required to
verify the same, 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 Rights Agreement or the execution and delivery hereof
(except the due execution hereof by the Rights Agent) or in respect of the
validity or execution of any Right Certificate (except its countersignature
thereof); nor shall it be responsible for any breach by the Company of any
covenant or condition contained in this Rights Agreement or in any Right
Certificate; nor shall it be responsible for any adjustment required under the
provisions of Section 11 or 12 or responsible for the manner, method or amount
of any such adjustment or the ascertaining of the existence of facts that would
require any such adjustment (except with respect to the exercise of Rights
evidenced by Right Certificates after 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 Preferred Shares or Common Shares
to be issued pursuant to this Rights Agreement or any Right Certificate or as to
whether any Preferred Shares or Common Shares 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 Rights Agreement.

         (g) The Rights Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from any
one of the Chairman of the Board, the Chief Executive Officer, the President,
the Chief Operating Officer, a Vice President (whether preceded by any
additional title), the Secretary or the Treasurer of the Company, 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 the Rights
Agent under this Rights 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,

                                      -34-


<PAGE>   35
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
reasonable care was exercised in the selection and continued employment thereof.

         (j) The Company agrees to indemnify and to hold the Rights Agent
harmless against any loss, liability, damage or expense (including reasonable
fees and expenses of counsel) which the Rights Agent may incur resulting from
its actions as Rights Agent pursuant to this Rights Agreement; provided,
however, that the Rights Agent shall not be indemnified or held harmless with
respect to any such loss, liability damage or expense incurred by the Rights
Agent as a result of, or arising out of, its own gross negligence, bad faith or
wilful misconduct. In no case shall the Company be liable with respect to any
action, proceeding, suit or claim against the Rights Agent unless the Rights
Agent shall have notified the Company, by letter or by facsimile confirmed by
letter, of the assertion of any action, proceeding, suit or claim against the
Rights Agent, promptly after the Rights Agent shall have notice of any such
assertion of an action, proceeding, suit or claim or have been served with the
summons or other first legal process giving information as to the nature and
basis of the action, proceeding, suit or claim. The Company shall be entitled to
participate at its own expense in the defense of any such action, proceeding,
suit or claim, and, if the Company so elects, the Company shall assume the
defense of any such action, proceeding, suit or claim. In the event that the
Company assumes such defense, the Company shall not thereafter be liable for the
fees and expenses of any additional counsel retained by the Rights Agent, so
long as the Company shall retain counsel satisfactory to the Rights Agent, in
the exercise of its reasonable judgment, to defend such action, proceeding, suit
or claim. The Rights Agent agrees not to settle any litigation in connection
with any action, proceeding, suit or claim with respect to which it may seek
indemnification from the Company without the prior written consent of the
Company.

         SECTION 22. Change of Rights Agent. The Rights Agent or any successor
Rights Agent may resign and be discharged from its duties under this Rights
Agreement upon 30 days' notice in writing mailed to the Company and to each
transfer agent of the Common Shares and the Preferred Shares by registered or
certified mail, and to the holders of the Right Certificates (or, prior to the
Distribution Date, of the Common Shares) 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 Shares and the Preferred Shares by
registered or certified mail, and to the holders of the Right Certificates (or,
prior to the Distribution Date, of the Common Shares) 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

                                      -35-


<PAGE>   36
the holder of a Right Certificate (or, prior to the Distribution Date, of the
Common Shares) (who shall, with such notice, submit his Right Certificate or,
prior to the Distribution Date, the certificate representing his Common Shares,
for inspection by the Company), then the registered holder of any Right
Certificate (or, prior to the Distribution Date, of the Common Shares) may apply
to any court of competent jurisdiction for the appointment of a new Rights
Agent. Any successor Rights Agent, whether appointed by the Company or by such a
court, shall be a corporation organized and doing business under the laws of the
United States or of the Commonwealth of Massachusetts (or of any other state of
the United States so long as such corporation is authorized to conduct a stock
transfer or corporate trust business in the Commonwealth of Massachusetts), in
good standing, having a principal office in the Commonwealth of Massachusetts,
which is authorized under such laws to exercise stock transfer or corporate
trust powers and is subject to supervision or examination by Federal or state
authority and which has at the time of its appointment as Rights Agent a
combined capital and surplus of at least $50,000,000; provided that the
principal transfer agent for the Common Shares shall in any event be qualified
to be the Rights Agent. After appointment, the successor Rights Agent shall be
vested with the same powers, rights, duties and responsibilities as if it had
been originally named as Rights Agent without further act or deed; but the
predecessor Rights Agent shall deliver and transfer to the successor Rights
Agent any property at the time held by it hereunder, and execute and deliver any
further assurance, conveyance, act or deed necessary for the purpose. Not later
than the effective date of any such appointment, the Company shall file notice
thereof in writing with the predecessor Rights Agent and each transfer agent of
the Common Shares and the Preferred Shares, and mail a notice thereof in writing
to the registered holders of the Right Certificates (or, prior to the
Distribution Date, of the Common Shares). Failure to give any notice provided
for in this Section 22, 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 23. Issuance of Additional Rights and Right Certificates.
Notwithstanding any of the provisions of this Rights Agreement or of the Rights
to the contrary, the Company may, at its option, issue new Right Certificates
evidencing Rights in such form as may be approved by its Board of Directors to
reflect any adjustment or change made in accordance with the provisions of this
Rights Agreement. In addition, in connection with the issuance or sale of Common
Shares following the Distribution Date and prior to the earlier of the
Redemption Date and the Expiration Date, the Company (a) shall, with respect to
Common Shares 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, notes or debentures issued by the Company, and (b) may,
in any other case, if deemed necessary or appropriate by the Board of Directors
of the Company, issue Right Certificates representing the appropriate number of
Rights in connection with such issuance or sale; provided, however, that (i) no
such Right Certificate shall be issued if, and to the extent that, the

                                      -36-


<PAGE>   37
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 Right Certificate would be issued, and (ii) no such Right
Certificate shall be issued if, and to the extent that, appropriate adjustment
shall otherwise have been made in lieu of the issuance thereof.

         SECTION 24.  Redemption and Termination.

         (a) The Board of Directors of the Company may, at its option, at any
time prior to the earlier of (i) such time as a Person becomes an Acquiring
Person and (ii) the Expiration Date, order the redemption of all, but not fewer
than all, the then outstanding Rights at the Redemption Price (the date of such
redemption being the "Redemption Date"), and the Company, at its option, may pay
the Redemption Price either in cash or Common Shares or other securities of the
Company deemed by the Board of Directors of the Company, in the exercise of its
sole discretion, to be at least equivalent in value to the Redemption Price;
provided, however, that, in addition to any other limitations contained herein
on the right to redeem outstanding Rights (including the occurrence of any event
or the expiration of any period after which the Rights may no longer be
redeemed), for the 120-day period after any date of a change (resulting from a
proxy or consent solicitation) in a majority of the Board of Directors of the
Company in office at the commencement of such solicitation, the Rights may only
be redeemed if (A) there are directors then in office who were in office at the
commencement of such solicitation and (B) the Board of Directors of the Company,
with the concurrence of a majority of such directors then in office, determines
that such redemption is, in their judgment, in the best interests of the Company
and its stockholders.

         (b) Immediately upon the action of the Board of Directors of the
Company ordering the redemption of the Rights, and without any further action
and without any notice, the right to exercise the Rights will terminate and the
only right thereafter of the holders of Rights shall be to receive the
Redemption Price. Within 10 Business Days after the action of the Board of
Directors of the Company ordering the redemption of the Rights, the Company
shall give notice of such redemption to the holders of the then outstanding
Rights by mailing such notice to all such holders 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
Shares. Each such notice of redemption will state the method by which payment of
the Redemption Price will be made. The notice, if mailed in the manner herein
provided, shall be conclusively presumed to have been duly given, whether or not
the holder of Rights receives such notice. In any case, failure to give such
notice by mail, or any defect in the notice, to any particular holder of Rights
shall not affect the sufficiency of the notice to other holders of Rights.

         SECTION 25. Notices. Notices or demands authorized by this Agreement to
be

                                      -37-


<PAGE>   38
given or made by the Rights Agent or by the holder of a Right Certificate (or,
prior to the Distribution Date, of the Common Shares) 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:

                                            Concentra Corporation
                                            21 North Avenue
                                            Burlington, MA 01803-3301
                                            Attention:  President

         Subject to the provisions of Section 22, any notice or demand
authorized by this Rights Agreement to be given or made by the Company or by the
holder of a Right Certificate (or, prior to the Distribution Date, of the Common
Shares) 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:

                                            The First National Bank of Boston
                                            c/o Boston EquiServe Limited 
                                             Partnership
                                            150 Royall Street
                                            Canton, MA 02021

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

         SECTION 26. Supplements and Amendments. At any time prior to the
Distribution Date and subject to the last sentence of this Section 26, the
Company may, and the Rights Agent shall if the Company so directs, supplement or
amend any provision of this Rights Agreement (including, without limitation, the
date on which the Distribution Date shall occur, the time during which the
Rights may be redeemed pursuant to Section 24 or any provision of the
Certificate of Designation) without the approval of any holder of the Rights.
From and after the Distribution Date and subject to applicable law, the Company
may, and the Rights Agent shall if the Company so directs, amend this Rights
Agreement without the approval of any holders of Right Certificates (i) to cure
any ambiguity or to correct or supplement any provision contained herein which
may be defective or inconsistent with any other provision of this Rights
Agreement or (ii) to make any other provisions in regard to matters or questions
arising hereunder which the Company may deem necessary or desirable and which
shall not adversely affect the interests of the holders of Right Certificates
(other than an Acquiring

                                      -38-


<PAGE>   39
Person or an Affiliate or Associate of an Acquiring Person). Any supplement or
amendment adopted during any period after any Person has become an Acquiring
Person but prior to the Distribution Date shall be null and void unless such
supplement or amendment could have been adopted under the prior sentence from
and after the Distribution Date. Any supplement or amendment to this Rights
Agreement duly approved by the Company that does not amend Sections 19, 20, 21
or 22 in a manner adverse to the Rights Agent shall become effective immediately
upon execution by the Company, whether or not also executed by the Rights Agent.
Notwithstanding anything contained in this Rights Agreement to the contrary,
during the 120-day period after any date of a change (resulting from a proxy or
consent solicitation) in a majority of the Board of Directors of the Company in
office at the commencement of such solicitation, this Rights Agreement may be
supplemented or amended only if (A) there are directors then in office who were
in office at the commencement of such solicitation and (B) the Board of
Directors of the Company, with the concurrence of a majority of such directors
then in office, determines that such supplement or amendment is, in their
judgment, in the best interests of the Company and its stockholders and, after
the Distribution Date, the holders of the Right Certificates. In addition,
notwithstanding anything to the contrary contained in this Rights Agreement, no
supplement or amendment to this Rights Agreement shall be made which (a) reduces
the Redemption Price (except as required by Section 12(a)) or (b) provides for
an earlier Expiration Date.

         SECTION 27. Successors. All the covenants and provisions of this Rights
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. Benefits of Rights Agreement; Determinations and Actions by
the Board of Directors, etc.

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

         (b) Except as explicitly otherwise provided in this Rights Agreement,
the Board of Directors of the Company shall have the exclusive power and
authority to administer this Rights Agreement and to exercise all rights and
powers specifically granted to the Board of Directors of the Company or to the
Company, or as may be necessary or advisable in the administration of this
Rights Agreement, including, without limitation, the right and power to (i)
interpret the provisions of this Rights Agreement and (ii) make all
determinations deemed necessary or advisable for the administration of this
Rights Agreement (including, without

                                      -39-


<PAGE>   40
limitation, a determination to redeem or not redeem the Rights or to amend this
Rights Agreement and a determination of whether there is an Acquiring Person).

         (c) Nothing contained in this Rights Agreement shall be deemed to be in
derogation of the obligation of the Board of Directors of the Company to
exercise its fiduciary duty. Without limiting the foregoing, nothing contained
herein shall be construed to suggest or imply that the Board of Directors shall
not be entitled to reject any tender offer, or to recommend that holders of
Common Shares reject any tender offer, or to take any other action (including,
without limitation, the commencement, prosecution, defense or settlement of any
litigation and the submission of additional or alternative offers or other
proposals) with respect to any tender offer that the Board of Directors believes
is necessary or appropriate in the exercise of such fiduciary duty.

         SECTION 29. Severability. If any term, provision, covenant or
restriction of this Rights 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 Rights
Agreement shall remain in full force and effect and shall in no way be affected,
impaired or invalidated.

         SECTION 30. Governing Law. This Rights Agreement and each Right
Certificate issued hereunder shall be deemed to be a contract made under the law
of the State of Delaware and for all purposes shall be governed by and construed
in accordance with the law of such State applicable to contracts to be made and
performed entirely within such State.

         SECTION 31. Counterparts; Effectiveness. The Rights 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. This Rights Agreement shall
be effective as of the Close of business on the date hereof.


             [The balance of this page is intentionally left blank.]



                                      -40-


<PAGE>   41
         SECTION 32. Descriptive Headings. Descriptive headings of the several
Sections of this Rights Agreement are inserted for convenience only and shall
not control or affect the meaning or construction of any of the provisions of
this Rights Agreement.

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


                                CONCENTRA CORPORATION



                                By: /s/ Alex Braverman
                                   ---------------------------------
                                         Alex Braverman
                                         Chief Financial Officer



                                THE FIRST NATIONAL BANK OF BOSTON



                                By: /s/ Colleen H. Shea
                                   ---------------------------------
                                      Name: Colleen H. Shea
                                      Title: Administration Manager


                                      -41-


<PAGE>   42
                                    EXHIBIT A


                              CONCENTRA CORPORATION

                           CERTIFICATE OF DESIGNATIONS


         Pursuant to Section 151 of the General Corporation Law of the State of
Delaware, Concentra Corporation, a corporation organized and existing under the
General Corporation Law of the State of Delaware, in accordance with the
provisions of Section 103 thereof, DOES HEREBY CERTIFY:

         That, pursuant to the authority conferred upon the Board of Directors
of the Corporation by the Restated Certificate of Incorporation of the
Corporation, the Board of Directors of the Corporation on April 21, 1997 adopted
the following resolution creating a series of Preferred Stock designated as
Series A Participating Cumulative Preferred Stock:

         RESOLVED, that, pursuant to the authority vested in the Board of
Directors of the Corporation in accordance with the provisions of the Restated
Certificate of Incorporation of the Corporation, a series of Preferred Stock of
the Corporation is hereby created and that the designation and number of shares
thereof and the voting powers, preferences and relative, participating, optional
and other special rights of the shares of such series, and the qualifications,
limitations or restrictions thereof are as follows:

         SECTION 1. Designation and Number of Shares. The shares of such series
shall be designated as "Series A Participating Cumulative Preferred Stock" (the
"Series A Preferred Stock"), par value $0.01 per share. The number of shares
initially constituting the Series A Preferred Stock shall be 8,000; provided,
however, that, if more than a total of 8,000 shares of Series A Preferred Stock
shall be issuable upon the exercise of Rights (the "Right") issued pursuant to
the Rights Agreement dated as of April 24, 1997, between the Corporation and The
First National Bank of Boston, as Rights Agent (the "Rights Agreement"), the
Board of Directors of the Corporation, pursuant to Section 151 (g) of the
General Corporation Law of the State of Delaware, shall direct by resolution or
resolutions that a certificate be properly executed, acknowledged, filed and
recorded, in accordance with the provisions of Section 103 thereof, providing
for the total number of shares of Series A Preferred Stock authorized to be
issued to be increased (to the extent that the Certificate of Incorporation then
permits) to the largest number of whole shares (rounded up to the nearest whole
number) issuable upon exercise of such Rights.


                                      -42-


<PAGE>   43
         SECTION 2.  Dividends or Distributions.

         (a) Subject to the prior and superior rights of the holders of shares
of any other series of Preferred Stock or other class of capital stock of the
Corporation ranking prior and superior to the shares of Series A Preferred Stock
with respect to dividends, the holders of shares of the Series A Preferred Stock
shall be entitled to receive, when, as and if declared by the Board of
Directors, out of the assets of the Corporation legally available therefor, (1)
quarterly dividends payable in cash on the last day of each fiscal quarter in
each year, or such other dates as the Board of Directors of the Corporation
shall approve (each such date being referred to herein as a "Quarterly Dividend
Payment Date"), commencing on the first Quarterly Dividend Payment Date after
the first issuance of a share or a fraction of a share of Series A Preferred
Stock, in the amount of $.01 per whole share (rounded to the nearest cent) less
the amount of all cash dividends declared on the Series A Preferred Stock
pursuant to the following clause (2) since the immediately preceding Quarterly
Dividend Payment Date or, with respect to the first Quarterly Dividend Payment
Date, since the first issuance of any share or fraction of a share of Series A
Preferred Stock (the total of which shall not, in any event, be less than zero)
and (2) dividends payable in cash on the payment date for each cash dividend
declared on the Common Stock in an amount per whole share (rounded to the
nearest cent) equal to the Formula Number (as hereinafter defined) then in
effect times the cash dividends then to be paid on each share of Common Stock.
In addition, if the Corporation shall pay any dividend or make any distribution
on the Common Stock payable in assets, securities or other forms of noncash
consideration (other than dividends or distributions solely in shares of Common
Stock), then, in each such case, the Corporation shall simultaneously pay or
make on each outstanding whole share of Series A Preferred stock a dividend or
distribution in like kind equal to the Formula Number then in effect times such
dividend or distribution on each share of the Common Stock. As used herein, the
"Formula Number" shall be 1,000; provided, however, that, if at any time after
April 24, 1997, the Corporation shall (i) declare or pay any dividend on the
Common Stock payable in shares of Common Stock or make any distribution on the
Common Stock in shares of Common Stock, (ii) subdivide (by a stock split or
otherwise) the outstanding shares of Common Stock into a larger number of shares
of Common Stock or (iii) combine (by a reverse stock split or otherwise) the
outstanding shares of Common Stock into a smaller number of shares of Common
Stock, then in each such event the Formula Number shall be adjusted to a number
determined by multiplying the Formula Number in effect immediately prior to such
event by a fraction, the numerator of which is the number of shares of Common
Stock that are outstanding immediately after such event and the denominator of
which is the number of shares of Common Stock that are outstanding immediately
prior to such event (and rounding the result to the nearest whole number); and
provided further, that, if at any time after April 24, 1997, the Corporation
shall issue any shares of its capital stock in a merger, reclassification, or
change of the outstanding shares of Common Stock, then in each such event the
Formula Number shall be appropriately adjusted to reflect such merger,

                                      -43-


<PAGE>   44
reclassification or change so that each share of Preferred Stock continues to be
the economic equivalent of a Formula Number of shares of Common Stock prior to
such merger, reclassification or change.

         (b) The Corporation shall declare a dividend or distribution on the
Series A Preferred Stock as provided in Section 2(a) immediately prior to or at
the same time it declares a dividend or distribution on the Common Stock (other
than a dividend or distribution solely in shares of Common Stock); provided,
however, that, in the event no dividend or distribution (other than a dividend
or distribution in shares of Common Stock) shall have been declared on the
Common Stock during the period between any Quarterly Dividend Payment Date and
the next subsequent Quarterly Dividend Payment Date, a dividend of $.01 per
share on the Series A Preferred Stock shall nevertheless be payable on such
subsequent Quarterly Dividend Payment Date. The Board of Directors may fix a
record date for the determination of holders of shares of Series A Preferred
Stock entitled to receive a dividend or distribution declared thereon, which
record date shall be the same as the record date for any corresponding dividend
or distribution on the Common Stock.

         (c) Dividends shall begin to accrue and be cumulative on outstanding
shares of Series A Preferred Stock from and after the Quarterly Dividend Payment
Date next preceding the date of original issue of such shares of Series A
Preferred Stock; provided, however, that dividends on such shares which are
originally issued after the record date for the determination of holders of
shares of Series A Preferred Stock entitled to receive a quarterly dividend and
on or prior to the next succeeding Quarterly Dividend Payment Date shall begin
to accrue and be cumulative from and after such Quarterly Dividend Payment Date.
Notwithstanding the foregoing, dividends on shares of Series A Preferred Stock
which are originally issued prior to the record date for the determination of
holders of shares of Series A Preferred Stock entitled to receive a quarterly
dividend on the first Quarterly Dividend Payment Date shall be calculated as if
cumulative from and after the last day of the fiscal quarter next preceding the
date of original issuance of such shares. Accrued but unpaid dividends shall not
bear interest. Dividends paid on the shares of Series A Preferred Stock 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.

         (d) So long as any shares of the Series A Preferred Stock are
outstanding, no dividends or other distributions shall be declared, paid or
distributed, or set aside for payment or distribution, on the Common Stock
unless, in each case, the dividend required by this Section 2 to be declared on
the Series A Preferred Stock shall have been declared.

         (e) The holders of the shares of Series A Preferred Stock shall not be
entitled to receive any dividends or other distributions except as provided
herein.

                                      -44-


<PAGE>   45
         SECTION 3. Voting Rights. The holders of shares of Series A Preferred
Stock shall have the following voting rights:

         (a) Each holder of Series A Preferred Stock shall be entitled to a
number of votes equal to the Formula Number then in effect, for each share of
Series A Preferred Stock held of record on each matter on which holders of the
Common stock or stockholders generally are entitled to vote, multiplied by the
maximum number of votes per share which any holder of the Common Stock or
stockholders generally then have with respect to such matter (assuming any
holding period or other requirement to vote a greater number of shares is
satisfied).

         (b) Except as otherwise provided herein or by applicable law, the
holders of shares of Series A Preferred Stock and the holders of shares of
Common Stock shall vote together as one class for the election of directors of
the Corporation and on all other matters submitted to a vote of stockholders of
the Corporation.

         (c) If, at the time of any annual meeting of stockholders for the
election of directors, the equivalent of six quarterly dividends (whether or not
consecutive) payable on any share or shares of Series A Preferred Stock are in
default, the number of directors constituting the Board of Directors of the
Corporation shall be increased by two. In addition to voting together with the
holders of Common Stock for the election of other directors of the Corporation,
the holders of record of the Series A Preferred Stock, voting separately as a
class to the exclusion of the holders of Common Stock, shall be entitled at said
meeting of stockholders (and at each subsequent annual meeting of stockholders),
unless all dividends in arrears have been paid or declared and set apart for
payment prior thereto, to vote for the election of two directors of the
Corporation, the holders of any Series A Preferred Stock being entitled to cast
a number of votes per share of Series A Preferred Stock equal to the Formula
Number. Until the default in payments of all dividends which permitted the
election of said directors shall cease to exist, any director who shall have
been so elected pursuant to the next preceding sentence may be removed at any
time, either with or without cause, only by the affirmative vote of the holders
of the shares of Series A Preferred Stock at the time entitled to cast a
majority of the votes entitled to be cast for the election of any such director
at a special meeting of such holders called for that purpose, and any vacancy
thereby created may be filled by the vote of such holders. If and when such
default shall cease to exist, the holders of the Series A Preferred Stock shall
be divested of the foregoing special voting rights, subject to revesting in the
event of each and every subsequent like default in payments of dividends. Upon
the termination of the foregoing special voting rights, the terms of office of
all persons who may have been elected directors pursuant to said special voting
rights shall forthwith terminate, and the number of directors constituting the
Board of Directors shall be reduced by two. The voting rights granted by this
Section 3(c) shall be in addition to any other voting rights granted to the
holders of the Series A Preferred Stock in this Section 3.

                                      -45-


<PAGE>   46
         (d) Except as provided herein, in Section 11 or by applicable law,
holders of Series A Preferred Stock shall have no special voting rights and
their consent shall not be required (except to the extent they are entitled to
vote with holders of Common Stock as set forth herein) for authorizing or taking
any corporate action.

         SECTION 4.  Certain Restrictions.

         (a) Whenever quarterly dividends or other dividends or distributions
payable on the Series A Preferred Stock as provided in Section 2 are in arrears,
thereafter and until all accrued and unpaid dividends and distributions, whether
or not declared, on shares of Series A Preferred Stock outstanding shall have
been paid in full, the Corporation 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 stock ranking junior (either as to dividends or upon
         liquidation, dissolution or winding up) to the Series A Preferred
         Stock;

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

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

                  (iv) purchase or otherwise acquire for consideration any
         shares of Series A Preferred Stock, or any shares of stock ranking on a
         parity with the Series A Preferred Stock, except in accordance with a
         purchase offer made in writing or by publication (as determined by the
         Board of Directors) to all holders of such shares upon such terms as
         the Board of Directors, 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.


                                      -46-


<PAGE>   47
         (b) The Corporation shall not permit any subsidiary of the Corporation
to purchase or otherwise acquire for consideration any shares of stock of the
Corporation unless the Corporation could, under paragraph (a) of this Section 4,
purchase or otherwise acquire such shares at such time and in such manner.

         SECTION 5. Liquidation Rights. Upon the liquidation, dissolution or
winding up of the Corporation, whether voluntary or involuntary, no distribution
shall be made (1) to the holders of shares of stock ranking junior (either as to
dividends or upon liquidation, dissolution or winding up) to the Series A
Preferred Stock unless, prior thereto, the holders of shares of Series A
Preferred Stock shall have received an amount equal to the accrued and unpaid
dividends and distributions thereon, whether or not declared, to the date of
such payment, plus an amount equal to the greater of (x) $.01 per whole share or
(y) an aggregate amount per share equal to the Formula Number then in effect
times the aggregate amount to be distributed per share to holders of Common
Stock or (2) to the holders of stock ranking on a parity (either as to dividends
or upon liquidation, dissolution or winding up) with the Series A Preferred
Stock, except distributions made ratably on the Series A Preferred Stock and all
other such parity stock in proportion to the total amounts to which the holders
of all such shares are entitled upon such liquidation, dissolution or winding
up.

         SECTION 6. Consolidation, Merger, etc. In case the Corporation shall
enter into any consolidation, merger, combination or other transaction in which
the shares of Common Stock are exchanged for or changed into other stock or
securities, cash or any other property, then in any such case the then
outstanding shares of Series A Preferred Stock shall at the same time be
similarly exchanged or changed into an amount per share equal to the Formula
Number then in effect times the aggregate amount of stock, securities, cash or
any other property (payable in kind), as the case may be, into which or for
which each share of Common Stock is exchanged or changed. In the event both this
Section 6 and Section 2 appear to apply to a transaction, this Section 6 will
control.

         SECTION 7.  No Redemption; No Sinking Fund.

         (a) The shares of Series A Preferred Stock shall not be subject to
redemption by the Corporation or at the option of any holder of Series A
Preferred Stock except as set forth in Section 5 of Article IV of the Restated
Certificate of Incorporation of the Corporation; provided, however, that the
Corporation may purchase or otherwise acquire outstanding shares of Series A
Preferred Stock in the open market or by offer to any holder or holders of
shares of Series A Preferred Stock.

         (b) The shares of Series A Preferred Stock shall not be subject to or
entitled to the operation of a retirement or sinking fund.


                                      -47-


<PAGE>   48
         SECTION 8. Ranking. The Series A Preferred Stock shall rank junior to
all other series of Preferred Stock of the Corporation, unless the Board of
Directors shall specifically determine otherwise in fixing the powers,
preferences and relative, participating, optional and other special rights of
the shares of such series and the qualifications, limitations and restrictions
thereof.

         SECTION 9. Fractional Shares. The Series A Preferred Stock shall be
issuable upon exercise of the Rights issued pursuant to the Rights Agreement in
whole shares or in any fraction of a share that is one one-thousandths (1/1000)
of a share or any integral multiple of such fraction which shall entitle the
holder, in proportion to such holder's fractional shares, to receive dividends,
exercise voting rights, participate in distributions and to have the benefit of
all other rights of holders of Series A Preferred Stock. In lieu of fractional
shares, the Corporation, prior to the first issuance of a share or a fraction of
a share of Series A Preferred Stock, may elect (1) to make a cash payment as
provided in the Rights Agreement for fractions of a share other than one
one-thousandths (1/1000) of a share or any integral multiple thereof or (2) to
issue depository receipts evidencing such authorized fraction of a share of
Series A Preferred Stock pursuant to an appropriate agreement between the
Corporation and a depository selected by the Corporation; provided that such
agreement shall provide that the holders of such depository receipts shall have
all the rights, privileges and preferences to which they are entitled as holders
of the Series A Preferred Stock.

         SECTION 10. Reacquired Shares. Any shares of Series A Preferred Stock
purchased or otherwise acquired by the Corporation in any manner whatsoever
shall be retired and canceled promptly after the acquisition thereof. All such
shares shall upon their cancellation become authorized but unissued shares of
Preferred Stock, without designation as to series until such shares are once
more designated as part of a particular series by the Board of Directors
pursuant to the provisions of Section 2 of Article IV of the Certificate of
Incorporation.

         SECTION 11. Amendment. None of the powers, preferences and relative,
participating, optional and other special rights of the Series A Preferred Stock
as provided herein or in the Certificate of Incorporation shall be amended in
any manner which would alter or change the powers, preferences, rights or
privileges of the holders of Series A Preferred Stock so as to affect them
adversely without the affirmative vote of the holders of at least 66 2/3% of the
outstanding shares of Series A Preferred Stock, voting as a separate class;
provided, however, that no such amendment approved by the holders of at least 66
2/3% of the outstanding shares of Series A Preferred Stock shall be deemed to
apply to the powers, preferences, rights or privileges of any holder of shares
of Series A Preferred Stock originally issued upon exercise of the Rights after
the time of such approval without the approval of such holder.


                                      -48-


<PAGE>   49
         IN WITNESS WHEREOF, the Corporation has caused this Certificate to be
duly executed in its corporate name on this 24th day of April 1997.


                                                   CONCENTRA CORPORATION



                                                   By: /s/ William E. Kelly
                                                      --------------------------
                                                            William E. Kelly
                                                            Secretary



                                      -49-


<PAGE>   50
                           [Form of Right Certificate]

                                    EXHIBIT B


         Certificate No. [R] - ____________Rights


         NOT EXERCISABLE AFTER APRIL 24, 2007, OR EARLIER IF REDEEMED BY THE
         COMPANY. THE RIGHTS ARE SUBJECT TO REDEMPTION, AT THE OPTION OF THE
         COMPANY, AT $0.001 PER RIGHT, ON THE TERMS SET FORTH IN THE RIGHTS
         AGREEMENT. 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 BY ANY SUBSEQUENT HOLDER OF SUCH
         RIGHTS ARE NULL AND VOID AND NONTRANSFERABLE.


                                RIGHT CERTIFICATE


         This certifies that ________________________ , or registered assigns,
is the registered owner of the number of Rights set forth above, each of which
entitles the owner thereof, subject to the terms, provisions and conditions of
the Rights Agreement dated as of April 24, 1997 (the "Rights Agreement"),
between Concentra Corporation, a Delaware corporation (the "Company"), and The
First National Bank of Boston, a national banking association, as Rights Agent
(the "Rights Agent"), unless the Rights evidenced hereby shall have been
previously redeemed by the Company, to purchase from the Company at any time
after the Distribution Date (as defined in the Rights Agreement) and prior to
5:00 p.m., Boston, Massachusetts time, on the 10th anniversary of the date of
the Rights Agreement (the "Expiration Date"), at the principal office of the
Rights Agent, or its successors as Rights Agent, in Boston, Massachusetts, one
one-thousandths (1/1000) of a fully paid, nonassessable share of Series A
Participating Cumulative Preferred Stock, par value $0.01 per share, of the
Company (the "Preferred Shares"), at a purchase price per one one-thousandths
(1/1000) of a share equal to $30 (the "Purchase Price") payable in cash, upon
presentation and surrender of this Right Certificate with the Form of Election
to Purchase duly executed.

         The Purchase Price and the number and kind of shares which may be
purchased upon exercise of each Right evidenced by this Right Certificate, as
set forth above, are the Purchase Price and the number and kind of shares which
may be so purchased as of April 24, 1997. As provided in the Rights Agreement,
the Purchase Price and the number and kind of shares which may be purchased upon
the exercise of each Right evidenced by this Right

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<PAGE>   51
Certificate are subject to modification and adjustment upon the happening of
certain events.

         If the Rights evidenced by this Right Certificate are at any time
beneficially owned by an Acquiring Person or an Affiliate or Associate of an
Acquiring Person (as such terms are defined in the Rights Agreement), such
Rights shall be null and void and nontransferable and the holder of any such
Right (including any purported transferee or subsequent holder) shall not have
any right to exercise or transfer any such Right.

         This Right Certificate is subject to all 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
reference to the Rights Agreement 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 Right Certificates. Copies
of the Rights Agreement are on file at the above-mentioned office of the Rights
Agent and are also available from the Company upon written request.

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

         Subject to the provisions of the Rights Agreement, the Rights evidenced
by this Right Certificate may be redeemed by the Company at its option at a
redemption price (in cash or shares of Common Stock or other securities of the
Company deemed by the Board of Directors to be at least equivalent in value) of
$0.001 per Right (which amount shall be subject to adjustment as provided in the
Rights Agreement) at any time prior to the earlier of (i) such time as a Person
becomes an Acquiring Person and (ii) the Expiration Date; provided, however,
that, for the 120-day period after any date of a change (resulting from a proxy
or consent solicitation) in a majority of the Board of Directors of the Company
in office at the commencement of such solicitation, the Rights may only be
redeemed if (A) there are directors then in office who were in office at the
commencement of such solicitation and (B) the Board of Directors of the Company,
with the concurrence of a majority of such directors then in office, determines
that such redemption is, in their judgment, in the best interests of the Company
and its stockholders.

         The Company may, but shall not be required to, issue fractions of
Preferred Shares or distribute certificates which evidence fractions of
Preferred Shares upon the exercise of any

                                      -51-


<PAGE>   52
Right or Rights evidenced hereby. In lieu of issuing fractional shares, the
Company may elect to make a cash payment as provided in the Rights Agreement for
fractions of a share other than one one-thousandths (1/1000) of a share or any
integral multiple thereof or to issue certificates or utilize a depository
arrangement as provided in the terms of the Rights Agreement and the Preferred
Shares.

         No holder of this Right Certificate shall be entitled to vote or
receive dividends or be deemed for any purpose the holder of the Preferred
Shares or of any other securities of the Company which may at any time be
issuable on the exercise hereof, nor shall anything contained in the Rights
Agreement or herein be construed to confer upon the holder hereof, as such, any
of the rights of a stockholder of the Company, including, without limitation,
any right to vote for the election of directors or upon any matter submitted to
stockholders at any meeting thereof, or to give or withhold consent to any
corporate action, or to receive notice of meetings or other actions affecting
stockholders (except as provided in the Rights Agreement), or to receive
dividends or other distributions or subscription rights, or otherwise, until the
Right or Rights evidenced by this Right Certificate shall have been exercised as
provided in accordance with the provisions of the Rights Agreement.

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

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


Dated as of:______________                CONCENTRA CORPORATION



                                          By:_________________________________
                                              Lawrence W. Rosenfeld, President

Attest:


_______________________________
William E. Kelly, Secretary





                                      -52-


<PAGE>   53
Countersigned:

THE FIRST NATIONAL BANK OF BOSTON, as Rights Agent



By:________________________
     Authorized Officer



                                      -53-


<PAGE>   54
                     [On Reverse Side of Right Certificate]

                          FORM OF ELECTION TO PURCHASE

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


To the Rights Agent:

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

Please insert social security or other identifying number


__________________________________________________________________________
         (Please print name and address)

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

Please insert social security or other identifying number

__________________________________________________________________________
         (Please print name and address)

Dated: ________________


                                                              __________________
                                                              Signature

Signature Guaranteed:





                                      -54-


<PAGE>   55
                                     NOTICE

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




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