ADAPTEC INC
8-A12G/A, 1997-01-14
COMPUTER COMMUNICATIONS EQUIPMENT
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 8-A/A

                                 AMENDMENT NO. 4

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

                                  ADAPTEC, INC.
                       ---------------------------------
             (Exact name of Registrant as specified in its charter)

              CALIFORNIA                                  94-2748530
     -------------------------------            -----------------------------
(State of incorporation or organization)       (IRS Employer Identification No.)



                              691 S. MILPITAS BLVD.
                               MILPITAS, CA 95035
               (Address of principal executive offices) (Zip Code)


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

     Title of each class                          Name of each exchange on which
     to be so registered                          each class is to be registered
     -------------------                          ------------------------------

            None                                        Not applicable

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

                         Preferred Share Purchase Rights
                      -------------------------------------
                                (Title of Class)
<PAGE>   2
Item 1.     DESCRIPTION OF SECURITIES TO BE REGISTERED.

            On April 25, 1989, the Board of Directors of Adaptec, Inc., a
California corporation (the "Company") declared a dividend of one share purchase
right (a "Right" or "Rights" collectively) for each outstanding share of Common
Stock, $.001 par value (the "Common Shares"), of the Company. The dividend was
paid on May 9, 1989 to shareholders or record at the close of business on that
date, and Rights have been issued in connection with all Common Shares issued
since that date. The rights issued were registered pursuant to Section 12(g) of
the Securities Exchange Act of 1934 (the "Act") on a Registration Statement on
Form 8-A as filed with the Securities and Exchange Commission on May 11, 1989.
Under the terms of the Common Shares Rights Agreement dated as of April 25, 1989
(the "1989 Rights Agreement") entered into by the Company and Bank of America,
N.T. & S.A. as rights agent, each Right entitled the registered holder to
purchase from the Company one share of Common Stock at a purchase price of $4.38
(after giving effect to 2-for-1 stock splits effected in March 1992,
January, 1994 and November 1996). On June 30, 1992, the Company's Board of
Directors approved the First Amended and Restated Common Shares Rights Agreement
(the "1992 Rights Agreement"), which as amended and restated the 1989 Rights
Agreement to, among other things, increase the exercise price of the Rights from
$4.38 to $25.00, extend the term of the Rights to June 30, 2002, eliminate the
self-dealing flip-in feature and add a permitted offer provision. In addition,
Chemical Bank and Trust Company of California was appointed to succeed Bank of
America, N.T. & S.A. as rights agent. On December 5, 1996, the Company's Board
of Directors approved the amendment and restatement of the 1992 Rights Agreement
to, among other things, make each Right exercisable for one one-thousandth of a
share of Series A Participating Preferred Stock (the "Series A Preferred") in
lieu of one share of Common Stock. The Company and ChaseMellon Shareholder
Services, LLC, the successor to Chemical Bank and Trust Company of California
(the "Rights Agent") have entered into the Second Amended and Restated Rights
Agreement dated as of December 5, 1996 (the "1996 Rights Agreement"), which
entitles the registered holder of a Right to purchase from the Company one
one-thousandth of a share of Series A Preferred at a price of $180.00 (the
"Exercise Price"), subject to adjustment. The description and terms of the
Rights are set forth in the 1996 Rights Agreement between the Company and the
Rights Agent.

            The following summary of the principal terms of the 1996 Rights
Agreement is a general description only and is subject to the detailed terms and
conditions of the Rights Agreement. A copy of the Rights Agreement is attached
as Exhibit 1 to this Registration Statement and is incorporated herein by
reference.

RIGHTS EVIDENCED BY COMMON SHARE CERTIFICATES

            The Rights will not be exercisable until the Distribution Date
(defined below). Certificates for the Rights ("RIGHTS CERTIFICATES") will not be
sent to stockholders and the Rights will attach to and trade only together with
the Common Shares. Accordingly, Common Share certificates outstanding on the
Record Date will evidence the Rights related thereto, and Common Share
certificates issued after the Record Date will contain a notation incorporating
the Rights Agreement by reference. Until the Distribution Date (or earlier
redemption or expiration of the Rights), the surrender or transfer of any
certificates for Common Shares, outstanding as of the Record Date, even without
notation or a copy of

                                      -2-
<PAGE>   3
the Summary of Rights being attached thereto, will also constitute the transfer
of the Rights associated with the Common Shares represented by such certificate.

DISTRIBUTION DATE

            The Rights will separate from the Common Shares, Rights Certificates
will be issued and the Rights will become exercisable upon the earlier of: (i)
the tenth day (or such later date as may be determined by a majority of the
Board of Directors, excluding directors affiliated with the Acquiring Person, as
defined below (the "CONTINUING DIRECTORS")) following a public announcement that
a person or group of affiliated or associated persons (an "ACQUIRING PERSON")
has acquired, or obtained the right to acquire, beneficial ownership of 20% or
more of the outstanding Common Shares, or (ii) 10 days (or such later date as
may be determined by a majority of the Continuing Directors) following the
commencement of, or announcement of an intention to make, a tender offer or
exchange offer the consummation of which would result in the beneficial
ownership by a person or group of 20% or more of the outstanding Common Shares.
The earlier of such dates is referred to as the "Distribution Date."

ISSUANCE OF RIGHTS CERTIFICATES; EXPIRATION OF RIGHTS

            As soon as practicable following the Distribution Date, separate
Rights Certificates will be mailed to holders of record of the Common Shares as
of the close of business on the Distribution Date and such separate Rights
Certificates alone will evidence the Rights from and after the Distribution
Date. All Common Shares issued prior to the Distribution Date will be issued
with Rights. Common Shares issued after the Distribution Date may be issued with
Rights if such shares are issued (i) upon the conversion of outstanding
convertible debentures or any other convertible securities issued after adoption
of the Rights Agreement or (ii) pursuant to the exercise of stock options or
under employee benefit plans or arrangements, unless any such issuance would
result in (or create a risk that) such options, plans or arrangements would not
qualify for otherwise available special tax treatment. Except as otherwise
determined by the Board of Directors, no other Common Shares issued after the
Distribution Date will be issued with Rights. The Rights will expire on the
earliest of (i) December 5, 2006 (the "FINAL EXPIRATION DATE"), (ii) redemption
or exchange of the Rights as described below, or (iii) consummation of an
acquisition of the Company satisfying certain conditions by a person who
acquired shares pursuant to a Permitted Offer as described below.

INITIAL EXERCISE OF THE RIGHTS

            Following the Distribution Date, and until one of the further events
described below, holders of the Rights will be entitled to receive, upon
exercise and the payment of $180.00 per Right, one one-thousandth of a share of
the Series A Preferred. In the event that the Company does not have sufficient
Series A Preferred available for all Rights to be exercised, or the Board
decides that such action is necessary and not contrary to the interests of
Rights holders, the Company may instead substitute cash, assets or other
securities for the Series A Preferred for which the Rights would have been
exercisable under this provision or as described below.


                                      -3-
<PAGE>   4
RIGHT TO BUY COMPANY COMMON SHARES

            Unless the Rights are earlier redeemed, in the event that an
Acquiring Person becomes the beneficial owner of 20% or more of the Company's
Common Shares then outstanding (other than pursuant to a Permitted Offer), then
proper provision will be made so that each holder of a Right which has not
theretofore been exercised (other than Rights beneficially owned by the
Acquiring Person, which will thereafter be void) will thereafter have the right
to receive, upon exercise, Common Shares (or, in certain circumstances as
determined by the Board of Directors, cash, other property or other securities)
having a market value equal to two times the Exercise Price. Rights are not
exercisable following the occurrence of an event as described above until such
time as the Rights are no longer redeemable by the Company as set forth below.

RIGHT TO BUY ACQUIRING COMPANY STOCK

            Similarly, unless the Rights are earlier redeemed, in the event
that, after the Shares Acquisition Date (as defined below), (i) the Company is
acquired in a merger or other business combination transaction, or (ii) 50% or
more of the Company's consolidated assets or earning power are sold (other than
in transactions in the ordinary course of business), proper provision must be
made so that each holder of a Right which has not theretofore been exercised
(other than Rights beneficially owned by the Acquiring Person, which will
thereafter be void) will thereafter have the right to receive, upon exercise,
shares of common stock of the acquiring company having a value equal to two
times the Exercise Price (unless the transaction satisfies certain conditions
and is consummated with a person who acquired shares pursuant to a Permitted
Offer, in which case the Rights will expire).

PERMITTED OFFER

            A Permitted Offer means a tender offer for all outstanding Common
Shares that has been made in the manner prescribed by Section 14(d) of the
Securities and Exchange Act of 1934, as amended, and determined by a majority of
the Continuing Directors to be fair and otherwise in the best interests of the
Company and its stockholders. Where the Board of Directors has determined that a
tender offer constitutes a Permitted Offer, the Rights will not become
exercisable to purchase Common Shares or shares of the acquiring company (as the
case may be) at the discounted price described above.

EXCHANGE PROVISION

            At any time after the acquisition by an Acquiring Person of 20% or
more of the Company's outstanding Common Shares and prior to the acquisition by
such Acquiring Person of 50% or more of the Company's outstanding Common Shares,
the Board of Directors of the Company may exchange the Rights (other than Rights
owned by the Acquiring Person), in whole or in part, at an exchange ratio of one
Common Share per Right.


                                      -4-
<PAGE>   5
REDEMPTION

            At any time on or prior to the close of business on the earlier of
(i) the tenth day following the acquisition by an Acquiring Person of 20% or
more of the Company's outstanding Common Shares (the "SHARES ACQUISITION DATE")
or such later date as may be determined by a majority of the Continuing
Directors and publicly announced by the Company, or (ii) the Final Expiration
Date of the Rights, the Company may redeem the Rights in whole, but not in part,
at a price of $.01 per Right.

ADJUSTMENTS TO PREVENT DILUTION

            The Purchase Price payable, the number of Rights, and the number of
Series A Preferred or Common Shares or other securities or property issuable
upon exercise of the Rights are subject to adjustment from time to time in
connection with the dilutive issuances by the Company as set forth in the Rights
Agreement.

CASH PAID INSTEAD OF ISSUING FRACTIONAL SHARES

            No fractional portion less than integral multiples of one Common
Share will be issued upon exercise of a Right and in lieu thereof, an adjustment
in cash will be made based on the market price of the Common Shares on the last
trading date prior to the date of exercise.

NO STOCKHOLDERS' RIGHTS PRIOR TO EXERCISE

            Until a Right is exercised, the holder thereof, as such, will have
no rights as a stockholder of the Company (other than any rights resulting from
such holder's ownership of Common Shares), including, without limitation, the
right to vote or to receive dividends.

AMENDMENT OF RIGHTS AGREEMENT

            The provisions of the Rights Agreement may be supplemented or
amended by the Board of Directors in any manner prior to the close of business
on the Distribution Date without the approval of Rights holders. After the
Distribution Date, the provisions of the Rights Agreement may be amended by the
Board in order to cure any ambiguity, defect or inconsistency, to make changes
which do not adversely affect the interests of holders of Rights (excluding the
interests of any Acquiring Person), or to shorten or lengthen any time period
under the Rights Agreement; provided, however, that no amendment to adjust the
time period governing redemption shall be made at such time as the Rights are
not redeemable.

RIGHTS AND PREFERENCES OF THE SERIES A PREFERRED

            Series A Preferred purchasable upon exercise of the Rights will not
be redeemable. Each share of Series A Preferred will be entitled to an aggregate
dividend of 1,000 times the dividend declared per Common Share. In the event of
liquidation, the holders of the Series A Preferred will be entitled to a
preferential liquidation payment equal to 1,000 times the per share amount to be
distributed to the holders


                                      -5-
<PAGE>   6
of the Common Shares. Each share of Series A Preferred will have 1,000 votes,
voting together with the Common Shares. In the event of any merger,
consolidation or other transaction in which the Common Shares are changed or
exchanged, each share of Series A Preferred will be entitled to receive 1,000
times the amount received per Common Share. These rights are protected by
customary anti-dilution provisions.

            Because of the nature of the dividend, liquidation and voting rights
of the shares of Series A Preferred, the value of the one one-thousandth
interest in a share of Series A Preferred purchasable upon exercise of each
Right should approximate the value of one Common Share.

CERTAIN ANTI-TAKEOVER EFFECTS

            The Rights approved by the Board are designed to protect and
maximize the value of the outstanding equity interests in the Company in the
event of an unsolicited attempt by an acquiror to take over the Company, in a
manner or on terms not approved by the Board of Directors. Takeover attempts
frequently include coercive tactics to deprive the Company's Board of Directors
and its stockholders of any real opportunity to determine the destiny of the
Company. The Rights have been declared by the Board in order to deter such
tactics, including a gradual accumulation of shares in the open market of a 20%
or greater position to be followed by a merger or a partial or two-tier tender
offer that does not treat all stockholders equally. These tactics unfairly
pressure stockholders, squeeze them out of their investment without giving them
any real choice and deprive them of the full value of their shares.

            The Rights are not intended to prevent a takeover of the Company and
will not do so. The Rights may be redeemed by the Company at $.01 per Right
within ten days (or such later date as may be determined by a majority of the
Board of Directors, excluding directors affiliated with an Acquiring Person)
after the accumulation of 20% or more of the Company's shares by a single
acquiror or group. Accordingly, the Rights should not interfere with any merger
or business combination approved by the Board of Directors.

            Issuance of the Rights does not in any way weaken the financial
strength of the Company or interfere with its business plans. The issuance of
the Rights themselves has no dilutive effect, will not affect reported earnings
per share, should not be taxable to the Company or to its stockholders, and will
not change the way in which the Company's shares are presently traded. The
Company's Board of Directors believes that the Rights represent a sound and
reasonable means of addressing the complex issues of corporate policy created by
the current takeover environment.

            However, the Rights may have the effect of rendering more difficult
or discouraging an acquisition of the Company deemed undesirable by the Board of
Directors. The Rights may cause substantial dilution to a person or group that
attempts to acquire the Company on terms or in a manner not approved by the
Company's Board of Directors, except pursuant to an offer conditioned upon the
negation, purchase or redemption of the Rights.


                                      -6-
<PAGE>   7
Item 2.     EXHIBITS.

       1        Form of Second Amended and Restated Rights
                Agreement, dated as of December 5, 1996
                between Adaptec, Inc. and ChaseMellon
                Shareholder Services, LLC., New York, NY,
                including the Certificate of Determination,
                the form of Rights Certificate and the
                Summary of Rights attached thereto as
                Exhibits A, B and C, respectively.

   
                                      -7-
<PAGE>   8
                                    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.

                                              ADAPTEC, INC.

Date:  January 10, 1997
                                            By: /s/ Christopher G. O'Meara
                                                --------------------------------
                                            Title: Vice President and Treasurer
                                                   -----------------------------
<PAGE>   9
                                  EXHIBIT INDEX

      Exhibit
        No.                        Exhibit
        ---                        -------

         1              Second Amended and Restated Rights Agreement dated as of
                        December 5, 1996, between Adaptec, Inc. and ChaseMellon
                        Shareholder Services, LLC., New York, NY, including
                        the form of Rights Certificate and the Certificate of
                        Determination, the Summary of Rights attached thereto as
                        Exhibits A, B and C, respectively.


<PAGE>   1




                                  ADAPTEC, INC.

                                       AND

                      CHASEMELLON SHAREHOLDER SERVICES, LLC

                                  RIGHTS AGENT




                           SECOND AMENDED AND RESTATED

                                RIGHTS AGREEMENT

                          DATED AS OF DECEMBER 5, 1996
<PAGE>   2
 


                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                  PAGE

<S>                  <C>                                                                                            <C>
Section 1.           Certain Definitions..........................................................................  1

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

Section 3.           Issuance of Rights Certificates..............................................................  7

Section 4.           Form of Rights Certificates..................................................................  9

Section 5.           Countersignature and Registration...........................................................   10

Section 6.           Transfer, Split Up, Combination and Exchange of
                     Rights Certificates; Mutilated, Destroyed, Lost or Stolen Rights Certificates...............   10

Section 7.           Exercise of Rights; Exercise Price; Expiration Date of Rights...............................   11

Section 8.           Cancellation and Destruction of Rights Certificates.........................................   13

Section 9.           Reservation and Availability of Preferred Shares............................................   13

Section 10.          Record Date.................................................................................   14

Section 11.          Adjustment of Exercise Price, Number of Shares or Number of Rights..........................   15

Section 12.          Certificate of Adjusted Exercise Price or Number of Shares..................................   21

Section 13.          Consolidation, Merger or Sale or Transfer of Assets or Earning Power........................   21

Section 14.          Fractional Rights and Fractional Shares.....................................................   25

Section 15.          Rights of Action............................................................................   26

Section 16.          Agreement of Rights Holders.................................................................   26

Section 17.          Rights Certificate Holder Not Deemed a Shareholder..........................................   27

Section 18.          Concerning the Rights Agent.................................................................   27

Section 19.          Merger or Consolidation or Change of Name of Rights Agent...................................   28

Section 20.          Duties of Rights Agent......................................................................   28
</TABLE>


                                       -i-
<PAGE>   3
                               TABLE OF CONTENTS
                                   (CONTINUED)

<TABLE>
<CAPTION>
                                                                                                                   PAGE  

<S>                  <C>                                                                                            <C>  
Section 21.          Change of Rights Agent.......................................................................  30

Section 22.          Issuance of New Rights Certificates..........................................................  31

Section 23.          Redemption...................................................................................  31

Section 24.          Exchange.....................................................................................  32

Section 25.          Notice of Certain Events.....................................................................  34

Section 26.          Notices......................................................................................  34

Section 27.          Supplements and Amendments...................................................................  35

Section 28.          Successors...................................................................................  35

Section 29.          Determinations and Actions by the Board of Directors, etc....................................  35

Section 30.          Benefits of this Agreement...................................................................  36

Section 31.          Severability.................................................................................  36

Section 32.          Governing Law................................................................................  36

Section 33.          Counterparts.................................................................................  36

Section 34.          Descriptive Headings.........................................................................  36


EXHIBITS

Exhibit A            Form of Certificate of Designation

Exhibit B            Form of Rights Certificate

Exhibit C            Summary of Rights
</TABLE>


                                      -ii-
<PAGE>   4
                          SECOND AMENDED AND RESTATED

                                RIGHTS AGREEMENT

           Second Amended and Restated Rights Agreement (the "AGREEMENT"), dated
as of December 5, 1996, between Adaptec, Inc., a California corporation (the
"COMPANY") and ChaseMellon Shareholder Services, LLC (the "RIGHTS AGENT").

           WHEREAS, the Company and the Rights Agent are parties to that certain
Rights Agreement dated as of April 25, 1989, as amended by that certain First
Amendment to Rights Agreement dated as of April 30, 1990 and that certain First
Amended and Restated Common Shares Rights Agreement dated as of June 30, 1992
(collectively, the "PRIOR AGREEMENT");

           WHEREAS, on April 25, 1989 (the "RIGHTS DIVIDEND DECLARATION DATE"),
the Board of Directors of the Company authorized and declared a dividend of one
share purchase right (a "RIGHT") for each Common Share (as hereinafter defined)
of the Company outstanding as of the Close of Business (as hereinafter defined)
on May 9, 1989 (the "RECORD DATE"), each Right representing the right to
purchase one Common Share (as such number may be adjusted pursuant to the
provisions of this Agreement) upon the terms and subject to the conditions set
forth in the Prior Agreement, and further authorized and directed the issuance
of one Right (as such number may be adjusted pursuant to the provisions of this
Agreement) with respect to each Common Share that shall become outstanding
between the Record Date and the earlier of the Distribution Date and the
Expiration Date (as such terms are hereinafter defined), and in certain
circumstances after the Distribution Date;

           WHEREAS, the Board of Directors of the Company has determined that it
is in the best interests of the Company and its shareholders to amend and
restate the Prior Agreement such that, among other things, each Right shall
hereafter represent the right to purchase one one-thousandth of a share of
Series A Participating Preferred Stock (as such number may be adjusted pursuant
to the provisions hereof), having the rights, preferences and privileges set
forth in the Certificate of Determination of Rights, Preferences and Privileges
of Series A Participating Preferred Stock, attached hereto as Exhibit A;

           WHEREAS, the Rights Agent has agreed to the amendment and restatement
of the Prior Agreement as set forth herein; and

           WHEREAS, the Company has determined that, pursuant to Section 27 of
the Prior Agreement, the Prior Agreement may be amended and restated as set
forth herein without the approval of the holders of the Rights (as hereinafter
defined);

           NOW, THEREFORE, in consideration of the promises and the mutual
agreements herein set forth, the Prior Agreement is hereby amended and restated
to read in full as follows:

           Section 1. Certain Definitions. For purposes of this Agreement, the
following terms have the meanings indicated:
<PAGE>   5
           (a) "ACQUIRING PERSON" shall mean any Person who or which, together
with all Affiliates and Associates of such Person, shall be the Beneficial Owner
of 20% or more of the Common Shares then outstanding, but shall not include the
Company, any Subsidiary of the Company or any employee benefit plan of the
Company or of any Subsidiary of the Company, or any entity holding Common Shares
for or pursuant to the terms of any such plan. Notwithstanding the foregoing, no
Person shall be deemed to be an Acquiring Person as the result of an acquisition
of Common Shares by the Company which, by reducing the number of shares
outstanding, increases the proportionate number of shares beneficially owned by
such Person to 20% or more of the Common Shares of the Company then outstanding;
provided, however, that if a Person shall become the Beneficial Owner of 20% or
more of the Common Shares of the Company then outstanding by reason of share
purchases by the Company and shall, after such share purchases by the Company,
become the Beneficial Owner of any additional Common Shares of the Company
(other than pursuant to a dividend or distribution paid or made by the Company
on the outstanding Common Shares in Common Shares or pursuant to a split or
subdivision of the outstanding Common Shares), then such Person shall be deemed
to be an Acquiring Person unless upon becoming the Beneficial Owner of such
additional Common Shares of the Company such Person does not beneficially own
20% or more of the Common Shares of the Company then outstanding.
Notwithstanding the foregoing, (i) if a majority of the Continuing Directors
then in office determines in good faith that a Person who would otherwise be an
"Acquiring Person," as defined pursuant to the foregoing provisions of this
paragraph (a), has become such inadvertently (including, without limitation,
because (A) such Person was unaware that it beneficially owned a percentage of
the Common Shares that would otherwise cause such Person to be an "Acquiring
Person," as defined pursuant to the foregoing provisions of this paragraph (a),
or (B) such Person was aware of the extent of the Common Shares it beneficially
owned but had no actual knowledge of the consequences of such beneficial
ownership under this Agreement) and without any intention of changing or
influencing control of the Company, and if such Person divested or divests as
promptly as practicable a sufficient number of Common Shares so that such Person
would no longer be an "Acquiring Person," as defined pursuant to the foregoing
provisions of this paragraph (a), then such Person shall not be deemed to be or
to have become an "Acquiring Person" for any purposes of this Agreement; and
(ii) if, as of the date hereof, any Person is the Beneficial Owner of 20% or
more of the Common Shares outstanding, such Person shall not be or become an
"Acquiring Person," as defined pursuant to the foregoing provisions of this
paragraph (a), unless and until such time as such Person shall become the
Beneficial Owner of additional Common Shares (other than pursuant to a dividend
or distribution paid or made by the Company on the outstanding Common Shares in
Common Shares or pursuant to a split or subdivision of the outstanding Common
Shares), unless, upon becoming the Beneficial Owner of such additional Common
Shares, such Person is not then the Beneficial Owner of 20% or more of the
Common Shares then outstanding.

           (b) "ADJUSTMENT FRACTION" shall have the meaning set forth in Section
11(a)(i) hereof.

           (c) "AFFILIATE" and "ASSOCIATE" shall have the respective meanings
ascribed to such terms in Rule 12b-2 of the General Rules and Regulations under
the Exchange Act, as in effect on the date of this Agreement.

           (d) A Person shall be deemed the "BENEFICIAL OWNER" of and shall be
deemed to "BENEFICIALLY OWN" any securities:


                                      -2-
<PAGE>   6
                 (i) which such Person or any of such Person's Affiliates or
Associates beneficially owns, directly or indirectly, for purposes of Section
13(d) of the Exchange Act and Rule 13d-3 thereunder (or any comparable or
successor law or regulation);

                 (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 (other than customary agreements with and between
underwriters and selling group members with respect to a bona fide public
offering of securities), 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 pursuant to this Section
1(d)(ii)(A) to be the Beneficial Owner of, or to beneficially own, (1)
securities tendered pursuant to a tender or exchange offer made by or on behalf
of such Person or any of such Person's Affiliates or Associates until such
tendered securities are accepted for purchase or exchange, or (2) securities
which a Person or any of such Person's Affiliates or Associates may be deemed to
have the right to acquire pursuant to any merger or other acquisition agreement
between the Company and such Person (or one or more of its Affiliates or
Associates) if such agreement has been approved by the Board of Directors of the
Company prior to there being an Acquiring Person; or (B) the right to vote
pursuant to any agreement, arrangement or understanding; provided, however, that
a Person shall not be deemed the Beneficial Owner of, or to beneficially own,
any security under this Section 1(d)(ii)(B) if the agreement, arrangement or
understanding to vote such security (1) arises solely from a revocable proxy or
consent given to such Person in response to a public proxy or consent
solicitation made pursuant to, and in accordance with, the applicable rules and
regulations of the Exchange Act and (2) is not also then reportable on Schedule
13D under the Exchange Act (or any comparable or successor report); or

                 (iii) which are beneficially owned, directly or indirectly, by
any other Person (or any Affiliate or Associate thereof) with which such Person
or any of such Person's Affiliates or Associates has any agreement, arrangement
or understanding, whether or not in writing (other than customary agreements
with and between underwriters and selling group members with respect to a bona
fide public offering of securities) for the purpose of acquiring, holding,
voting (except to the extent contemplated by the proviso to Section 1(d)(ii)(B))
or disposing of any securities of the Company; provided, however, that in no
case shall an officer or director of the Company be deemed (x) the Beneficial
Owner of any securities beneficially owned by another officer or director of the
Company solely by reason of actions undertaken by such persons in their capacity
as officers or directors of the Company or (y) the Beneficial Owner of
securities held of record by the trustee of any employee benefit plan of the
Company or any Subsidiary of the Company for the benefit of any employee of the
Company or any Subsidiary of the Company, other than the officer or director, by
reason of any influence that such officer or director may have over the voting
of the securities held in the plan.

           (e) "BUSINESS DAY" shall mean any day other than a Saturday, Sunday
or a day on which banking institutions in the State of California are authorized
or obligated by law or executive order to close.


                                      -3-
<PAGE>   7
           (f) "CLOSE OF BUSINESS" on any given date shall mean 5:00 P.M., San
Francisco time, on such date; provided, however, that if such date is not a
Business Day it shall mean 5:00 P.M., San Francisco time, on the next succeeding
Business Day.

           (g) "COMMON SHARES" when used with reference to the Company shall
mean the shares of Common Stock of the Company, $.001 par value. Common Shares
when used with reference to any Person other than the Company shall mean the
capital stock (or equity interest) with the greatest voting power of such other
Person or, if such other Person is a Subsidiary of another Person, the Person or
Persons which ultimately control such first-mentioned Person.

           (h) "COMMON STOCK EQUIVALENTS" shall have the meaning set forth in
Section 11(a)(iii) hereof.

           (i) "COMPANY" shall mean Adaptec, Inc., a California corporation,
subject to the terms of Section 13(a)(iii)(C) hereof.

           (j) "CONTINUING DIRECTOR" shall mean (i) any member of the Board of
Directors of the Company who, while a member of the Board, is not an Acquiring
Person, or an Affiliate or Associate of an Acquiring Person, or a representative
of an Acquiring Person or of any such Affiliate or Associate, and who was a
member of the Board prior to there being an Acquiring Person, and (ii) any
Person who subsequently becomes a member of the Board and who, while a member of
the Board, is not an Acquiring Person, or an Affiliate or Associate of an
Acquiring Person, or a represen tative of an Acquiring Person or of any such
Affiliate or Associate, if such Person's nomination for election or election to
the Board is recommended or approved by a majority of the Continuing Directors.

           (k) "CURRENT PER SHARE MARKET PRICE" of any security (a "Security"
for purposes of this definition), for all computations other than those made
pursuant to Section 11(a)(iii) hereof, shall mean the average of the daily
closing prices per share of such Security for the thirty (30) consecutive
Trading Days immediately prior to such date, and for purposes of computations
made pursuant to Section 11(a)(iii) hereof, the Current Per Share Market Price
of any Security on any date shall be deemed to be the average of the daily
closing prices per share of such Security for the ten (10) consecutive Trading
Days immediately prior to such date; provided, however, that in the event that
the Current Per Share Market Price of the Security is determined during a period
following the announcement by the issuer of such Security of (i) a dividend or
distribution on such Security payable in shares of such Security or securities
convertible into such shares or (ii) any subdivision, combination or
reclassification of such Security, and prior to the expiration of the applicable
thirty (30) Trading Day or ten (10) Trading Day period, after the ex-dividend
date for such dividend or distribution, or the record date for such subdivision,
combination or reclassification, then, and in each such case, the Current Per
Share Market Price shall be appropriately adjusted to reflect the current market
price per share equivalent of such Security. The closing price for each day
shall be the last sale price, regular way, or, in case no such sale takes place
on such day, the average of the closing bid and asked prices, regular way, in
either case as reported in the principal consolidated transaction reporting
system with respect to securities listed or admitted to trading on the New York
Stock Exchange or, if the Security is not listed or admitted to trading on the
New York Stock Exchange, as reported in the principal consolidated transaction
reporting


                                      -4-
<PAGE>   8
system with respect to securities listed on the principal national securities
exchange on which the Security is listed or admitted to trading or, if the
Security is not listed or admitted to trading on any national securities
exchange, the last sale price or, if such last sale price is not reported, the
average of the high bid and low asked prices in the over-the-counter market, as
reported by Nasdaq or such other system then in use, or, if on any such date the
Security is not quoted by any such organization, the average of the closing bid
and asked prices as furnished by a professional market maker making a market in
the Security selected by the Board of Directors of the Company. If on any such
date no market maker is making a market in the Security, the fair value of such
shares on such date as determined in good faith by the Board of Directors of the
Company shall be used. If the Preferred Shares are not publicly traded, the
Current Per Share Market Price of the Preferred Shares shall be conclusively
deemed to be the Current Per Share Market Price of the Common Shares as
determined pursuant to this Section 1(k), as appropriately adjusted to reflect
any stock split, stock dividend or similar transaction occurring after the date
hereof, multiplied by 1000. If the Security is not publicly held or so listed or
traded, Current Per Share Market Price shall mean the fair value per share as
determined in good faith by the Board of Directors of the Company, whose
determination shall be described in a statement filed with the Rights Agent and
shall be conclusive for all purposes.

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

           (m) "DISTRIBUTION DATE" shall mean the earlier of (i) the Close of
Business on the tenth day (or such later date as may be determined by action of
a majority of Continuing Directors then in office) after the Shares Acquisition
Date (or, if the tenth day after the Shares Acquisition Date occurs before the
Record Date, the Close of Business on the Record Date) or (ii) the Close of
Business on the tenth Business Day (or such later date as may be determined by
action of a majority of Continuing Directors then in office) after the date that
a tender or exchange offer by any Person (other than the Company, any Subsidiary
of the Company, any employee benefit plan of the Company or of any Subsidiary of
the Company, or any Person or entity organized, appointed or established by the
Company for or pursuant to the terms of any such plan) is first published or
sent or given within the meaning of Rule 14d-2(a) of the General Rules and
Regulations under the Exchange Act, if, assuming the successful consummation
thereof, such Person would be an Acquiring Person.

           (n) "EQUIVALENT SHARES" shall mean Preferred Shares and any other
class or series of capital stock of the Company which is entitled to the same
rights, privileges and preferences as the Preferred Shares.

           (o) "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, as
amended.
                   
           (p) "EXCHANGE RATIO" shall have the meaning set forth in Section
24(a) hereof.

           (q) "EXERCISE PRICE" shall have the meaning set forth in Section 4(a)
hereof.

           (r) "EXPIRATION DATE" shall mean the earliest to occur of: (i) the
Close of Business on the Final Expiration Date, (ii) the Redemption Date, (iii)
consummation of any transaction con-


                                      -5-
<PAGE>   9
templated by Section 13(f) hereof, or (iv) the time at which the Board of
Directors orders the exchange of the Rights as provided in Section 24 hereof.

           (s) "FINAL EXPIRATION DATE" shall mean December 5, 2006.

           (t) "NASDAQ" shall mean the National Association of Securities
Dealers, Inc. Automated Quotations System.

           (u) "PERMITTED OFFER" shall mean a tender offer for all outstanding
Common Shares made in the manner prescribed by Section 14(d) of the Exchange Act
and the rules and regulations promulgated thereunder; provided, however, that
such tender offer occurs at a time when Continuing Directors are in office and a
majority of the Continuing Directors then in office has determined that the
offer is both fair and otherwise in the best interests of the Company and its
shareholders (taking into account all factors that such Continuing Directors
deem relevant).

           (v) "PERSON" shall mean any individual, firm, corporation or other
entity, and shall include any successor (by merger or otherwise) of such entity.

           (w) "POST-EVENT TRANSFEREE" shall have the meaning set forth in
Section 7(e) hereof.

           (x) "PREFERRED SHARES" shall mean shares of Series A Participating
Preferred Stock, $0.001 par value, of the Company.

           (y) "PRE-EVENT TRANSFEREE" shall have the meaning set forth in
Section 7(e) hereof.

           (z) "PRINCIPAL PARTY" shall have the meaning set forth in Section
13(b) hereof.

           (aa) "RECORD DATE" shall have the meaning set forth in the recitals
at the beginning of this Agreement.

           (bb) "REDEMPTION DATE" shall have the meaning set forth in Section
23(a) hereof.

           (cc) "REDEMPTION PRICE" shall have the meaning set forth in Section
23(a) hereof.

           (dd) "RIGHTS AGENT" shall mean ChaseMellon Shareholder Services, LLC
r its successor or replacement as provided in Sections 19 and 21 hereof.

           (ee) "RIGHTS CERTIFICATE" shall mean a certificate substantially in
the form attached hereto as Exhibit B.

           (ff) "RIGHTS DIVIDEND DECLARATION DATE" shall have the meaning set
forth in the recitals at the beginning of this Agreement.


                                      -6-
<PAGE>   10
           (gg) "SECTION 11(A)(ii) TRIGGER DATE" shall have the meaning set
forth in Section 11(a)(iii) hereof.

           (hh) "SECTION 13 EVENT" shall mean any event described in clause (i),
(ii) or (iii) of Section 13(a) hereof.

           (ii) "SECURITIES ACT" shall mean the Securities Act of 1933, as
amended.

           (jj) "SHARES ACQUISITION DATE" shall mean the first date of public
announcement (which, for purposes of this definition, shall include, without
limitation, a report filed pursuant to Section 13(d) under the Exchange Act) by
the Company or an Acquiring Person that an Acquiring Person has become such;
provided that, if such Person is determined not to have become an Acquiring
Person pursuant to Section 1(a) hereof, then no Shares Acquisition Date shall be
deemed to have occurred.

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

           (ll) "SUBSIDIARY" of any Person shall mean any corporation or other
entity of which an amount of voting securities sufficient to elect a majority of
the directors or Persons having similar authority of such corporation or other
entity is beneficially owned, directly or indirectly, by such Person, or any
corporation or other entity otherwise controlled by such Person.

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

           (nn) "SUMMARY OF RIGHTS" shall mean a summary of this Agreement
substantially in the form attached hereto as Exhibit C.

           (oo) "TOTAL EXERCISE PRICE" shall have the meaning set forth in
Section 4(a) hereof.

           (pp) "TRADING DAY" shall mean a day on which the principal national
securities exchange on which a referenced security is listed or admitted to
trading is open for the transaction of business or, if a referenced security is
not listed or admitted to trading on any national securities exchange, a
Business Day.

           (qq) A "TRIGGERING EVENT" shall be deemed to have occurred upon any
Person, becoming an Acquiring Person.

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


                                      -7-
<PAGE>   11
           Section 3.    Issuance of Rights Certificates.

                     (a) Until the Distribution Date, (i) the Rights will be
evidenced (subject to the provisions of Sections 3(b) and 3(c) hereof) by the
certificates for Common Shares registered in the names of the holders thereof
(which certificates shall also be deemed to be Rights Certificates) and not by
separate Rights Certificates and (ii) the right to receive Rights Certificates
will be transferable only in connection with the transfer of Common Shares.
Until the earlier of the Distribution Date or the Expiration Date, the surrender
for transfer of certificates for Common Shares shall also constitute the
surrender for transfer of the Rights associated with the Common Shares
represented thereby. As soon as practicable after the Distribution Date, the
Company will prepare and execute, the Rights Agent will countersign, and the
Company will send or cause to be sent (and the Rights Agent will, if requested,
send) by first-class, postage-prepaid mail, to each record holder of Common
Shares as of the Close of Business on the Distribution Date, at the address of
such holder shown on the records of the Company, a Rights Certificate evidencing
one Right for each Common Share so held, subject to adjustment as provided
herein. In the event that an adjustment in the number of Rights per Common Share
has been made pursuant to Section 11 hereof, then at the time of distribution of
the Rights Certificates, the Company shall make the necessary and appropriate
rounding adjustments (in accordance with Section 14(a) hereof) so that Rights
Certificates representing only whole numbers of Rights are distributed and cash
is paid in lieu of any fractional Rights. As of the Distribution Date, the
Rights will be evidenced solely by such Rights Certificates and may be
transferred by the transfer of the Rights Certificates as permitted hereby,
separately and apart from any transfer of Common Shares, and the holders of such
Rights Certificates as listed in the records of the Company or any transfer
agent or registrar for the Rights shall be the record holders thereof.

                     (b) On the Record Date or as soon as practicable
thereafter, the Company will send a copy of the Summary of Rights by
first-class, postage-prepaid mail, to each record holder of Common Shares as of
the Close of Business on the Record Date, at the address of such holder shown on
the records of the Company's transfer agent and registrar. With respect to
certificates for Common Shares outstanding as of the Record Date, until the
Distribution Date, the Rights will be evidenced by such certificates registered
in the names of the holders thereof together with the Summary of Rights. Until
the Distribution Date (or, if earlier, the Expiration Date), the surrender for
transfer of any certificate for Common Shares outstanding on the Record Date,
with or without a copy of the Summary of Rights, shall also constitute the
transfer of the Rights associated with the Common Shares represented thereby.

                     (c) Unless the Board of Directors by resolution adopted at
or before the time of the issuance of any Common Shares specifies to the
contrary, Rights shall be issued in respect of all Common Shares that are issued
after the Record Date but prior to the earlier of the Distribution Date or the
Expiration Date or, in certain circumstances provided in Section 22 hereof,
after the Distribution Date. Certificates representing such Common Shares shall
also be deemed to be certificates for Rights, and shall bear the following
legend:

           THIS CERTIFICATE ALSO EVIDENCES AND ENTITLES THE HOLDER HEREOF TO
           CERTAIN RIGHTS AS SET FORTH IN THE SECOND AMENDED AND RESTATED RIGHTS
           AGREEMENT BETWEEN ADAPTEC, INC. AND 

   
                                       -8-
<PAGE>   12
           CHASEMELLON SHAREHOLDER SERVICES, LLC, AS THE RIGHTS AGENT, DATED AS
           OF DECEMBER 5, 1996, (THE "RIGHTS AGREEMENT"), THE TERMS OF WHICH ARE
           HEREBY INCORPORATED HEREIN BY REFERENCE AND A COPY OF WHICH IS ON
           FILE AT THE PRINCIPAL EXECUTIVE OFFICES OF ADAPTEC, INC. UNDER
           CERTAIN CIRCUMSTANCES, AS SET FORTH IN THE RIGHTS AGREEMENT, SUCH
           RIGHTS WILL BE EVIDENCED BY SEPARATE CERTIFICATES AND WILL NO LONGER
           BE EVIDENCED BY THIS CERTIFICATE. ADAPTEC, INC. WILL MAIL TO THE
           HOLDER OF THIS CERTIFICATE A COPY OF THE RIGHTS AGREEMENT WITHOUT
           CHARGE AFTER RECEIPT OF A WRITTEN REQUEST THEREFOR. UNDER CERTAIN
           CIRCUMSTANCES SET FORTH IN THE RIGHTS AGREEMENT, RIGHTS ISSUED TO, OR
           HELD BY, ANY PERSON WHO IS, WAS OR BECOMES AN ACQUIRING PERSON OR ANY
           AFFILIATE OR ASSOCIATE THEREOF (AS SUCH TERMS ARE DEFINED IN THE
           RIGHTS AGREEMENT), WHETHER CURRENTLY HELD BY OR ON BEHALF OF SUCH
           PERSON OR BY ANY SUBSEQUENT HOLDER, MAY BECOME NULL AND VOID.

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

                     (d) In the event that the Company purchases or acquires any
Common Shares after the Record Date but prior to the Distribution Date, any
Rights associated with such Common Shares shall be deemed canceled and retired
so that the Company shall not be entitled to exercise any Rights associated with
the Common Shares which are no longer outstanding.

           Section 4.    Form of Rights Certificates.

                     (a) The Rights Certificates (and the forms of election to
purchase Preferred Shares and of assignment to be printed on the reverse
thereof) shall be substantially in the form of Exhibit B hereto and may have
such marks of identification or designation and such legends, summaries or
endorsements printed thereon as the Company may deem appropriate and as are not
inconsistent with the provisions of this Agreement, or as may be required to
comply with any applicable law or with any rule or regulation made pursuant
thereto or with any rule or regulation of any stock exchange or a national
market system, on which the Rights may from time to time be listed or included,
or to conform to usage. Subject to the provisions of Section 11 and Section 22
hereof, the Rights Certificates, whenever distributed, shall be dated as of the
Record Date (or in the case of Rights issued with respect to Common Shares
issued by the Company after the Record Date, as of the date of issuance of such
Common Shares) and on their face shall entitle the holders thereof to purchase
such number of one-thousandths of a Preferred Share as shall be set forth
therein at the price set forth therein (such exercise price per one
one-thousandth of a Preferred Share being hereinafter referred to as the
"EXERCISE PRICE" and the aggregate Exercise Price of all Preferred Shares
issuable upon exercise of one Right being hereinafter referred to


                                      -9-
<PAGE>   13
as the "TOTAL EXERCISE PRICE"), but the number and type of securities
purchasable upon the exercise of each Right and the Exercise Price shall be
subject to adjustment as provided herein.

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

           THE RIGHTS REPRESENTED BY THIS RIGHTS CERTIFICATE ARE OR WERE
           BENEFICIALLY OWNED BY A PERSON WHO WAS OR BECAME AN ACQUIRING PERSON
           OR AN AFFILIATE OR ASSOCIATE OF AN ACQUIRING PERSON (AS SUCH TERMS
           ARE DEFINED IN THE RIGHTS AGREEMENT). ACCORDINGLY, THIS RIGHTS
           CERTIFICATE AND THE RIGHTS REPRE SENTED HEREBY MAY BECOME NULL AND
           VOID IN THE CIRCUMSTANCES SPECIFIED IN SECTION 7(e) OF THE RIGHTS
           AGREEMENT.

           Section 5.    Countersignature and Registration.

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

                     (b) Following the Distribution Date, the Rights Agent will
keep or cause to be kept, at its office designated for such purposes, books for
registration and transfer of the Rights Certificates 

    
                                      -10-
<PAGE>   14
issued hereunder. Such books shall show the names and addresses of the
respective holders of the Rights Certificates, the number of Rights evidenced on
its face by each of the Rights Certificates and the date of each of the Rights
Certificates.

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

                     (a) Subject to the provisions of Sections 7(e), 14 and 24
hereof, at any time after the Close of Business on the Distribution Date, and at
or prior to the Close of Business on the Expira tion Date, any Rights
Certificate or Rights Certificates may be transferred, split up, combined or
exchanged for another Rights Certificate or Rights Certificates, entitling the
registered holder to purchase a like number of one-thousandths of a Preferred
Share (or, following a Triggering Event, other securities, cash or other assets,
as the case may be) as the Rights Certificate or Rights Certifi cates
surrendered then entitled such holder to purchase. Any registered holder
desiring to transfer, split up, combine or exchange any Rights Certificate or
Rights Certificates shall make such request in writing delivered to the Rights
Agent, and shall surrender the Rights Certificate or Rights Certifi cates to be
transferred, split up, combined or exchanged at the office of the Rights Agent
designated for such purpose. Neither the Rights Agent nor the Company shall be
obligated to take any action whatsoever with respect to the transfer of any such
surrendered Rights Certificate until the registered holder shall have completed
and signed the certificate contained in the form of assignment on the reverse
side of such Rights Certificate and shall have provided such additional evidence
of the identity of the Beneficial Owner (or former Beneficial Owner) or
Affiliates or Associates thereof as the Company shall reasonably request.
Thereupon the Rights Agent shall, subject to Sections 7(e), 14 and 24 hereof,
countersign and deliver to the person entitled thereto a Rights Certificate or
Rights Certificates, as the case may be, as so requested. The Company may
require payment of a sum sufficient to cover any tax or governmental charge that
may be imposed in connection with any transfer, split up, combination or
exchange of Rights Certificates.

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

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

                     (a) Subject to Sections 7(e), 23(b) and 24(b) hereof, the
registered holder of any Rights Certificate may exercise the Rights evidenced
thereby (except as otherwise provided herein) in whole or in part at any time
after the Distribution Date and prior to the Close of Business on the Expiration
Date by surrender of the Rights 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 designated for such purpose, together with payment of
the Exercise Price for each one-thousandth of a Preferred Share 


                                      -11-
<PAGE>   15
(or, following a Triggering Event, other securities, cash or other assets as the
case may be) as to which the Rights are exercised.

                     (b) The Exercise Price for each one-thousandth of a
Preferred Share issuable pursuant to the exercise of a Right shall initially be
One Hundred Eighty Dollars ($180.00), shall be subject to adjustment from time
to time as provided in Sections 11 and 13 hereof and shall be payable in lawful
money of the United States of America in accordance with paragraph (c) below.

                     (c) Upon receipt of a Rights Certificate representing
exercisable Rights, with the form of election to purchase duly executed,
accompanied by payment of the Exercise Price for the number of one-thousandths
of a Preferred Share (or, following a Triggering Event, other securities, cash
or other assets as the case may be) to be purchased and an amount equal to any
applicable transfer tax required to be paid by the holder of such Rights
Certificate in accordance with Section 9(e) hereof, the Rights Agent shall,
subject to Section 20(k) hereof, thereupon promptly (i) (A) requisition from any
transfer agent of the Preferred Shares (or make available, if the Rights Agent
is the transfer agent for the Preferred Shares) a certificate or certificates
for the number of one- thousandths of a Preferred Share (or, following a
Triggering Event, other securities, cash or other assets as the case may be) to
be purchased and the Company hereby irrevocably authorizes its transfer agent to
comply with all such requests or (B) if the Company shall have elected to
deposit the total number of one-thousandths of a Preferred Share (or, following
a Triggering Event, other securities, cash or other assets as the case may be)
issuable upon exercise of the Rights hereunder with a depositary agent,
requisition from the depositary agent depositary receipts representing such
number of one-thousandths of a Preferred Share (or, following a Triggering
Event, other securities, cash or other assets as the case may be) as are to be
purchased (in which case certificates for the Preferred Shares (or, following a
Triggering Event, other securities, cash or other assets as the case may be)
represented by such receipts shall be deposited by the transfer agent with the
depositary agent) and the Company hereby directs the depositary agent to comply
with such request, (ii) when appropriate, requisition from the Company the
amount of cash to be paid in lieu of issuance of fractional shares in accordance
with Section 14 hereof, (iii) after receipt of such certificates or depositary
receipts, cause the same to be delivered to or upon the order of the registered
holder of such Rights Certificate, registered in such name or names as may be
designated by such holder and (iv) when appropriate, after receipt thereof,
deliver such cash to or upon the order of the registered holder of such Rights
Certificate. The payment of the Exercise Price (as such amount may be reduced
(including to zero) pursuant to Section 11(a)(iii) hereof) and an amount equal
to any applicable transfer tax required to be paid by the holder of such Rights
Certificate in accordance with Section 9(e) hereof, may be made in cash or by
certified bank check, cashier's check or bank draft payable to the order of the
Company. In the event that the Company is obligated to issue securities of the
Company other than Preferred Shares, pay cash and/or distribute other property
pursuant to Section 11(a) hereof, the Company will make all arrangements
necessary so that such other securities, cash and/or other property are
available for distribution by the Rights Agent, if and when appropriate.

                     (d) In case the registered holder of any Rights Certificate
shall exercise less than all the Rights evidenced thereby, a new Rights
Certificate evidencing Rights equivalent to the Rights remaining unexercised
shall be issued by the Rights Agent to the registered holder of such Rights
Certificate or to his or her duly authorized assigns, subject to the provisions
of Section 14 hereof.


                                      -12-
<PAGE>   16
                     (e) Notwithstanding anything in this Agreement to the
contrary, from and after the first occurrence of a Triggering Event, any Rights
beneficially owned by (i) an Acquiring Person or an Associate or Affiliate of an
Acquiring Person, (ii) a transferee of an Acquiring Person (or of any such
Associate or Affiliate) who becomes a transferee after the Acquiring Person
becomes such (a "POST-EVENT TRANSFEREE"), (iii) a transferee of an Acquiring
Person (or of any such Associate or Affiliate) who becomes a transferee prior to
or concurrently with the Acquiring Person becoming such and receives such Rights
pursuant to either (A) a transfer (whether or not for consideration) from the
Acquiring Person to holders of equity interests in such Acquiring Person or to
any Person with whom the Acquiring Person has any continuing agreement,
arrangement or understanding regarding the transferred Rights or (B) a transfer
which a majority of the Continuing Directors then in office has determined is
part of a plan, arrangement or understanding which has as a primary purpose or
effect the avoidance of this Section 7(e) (a "PRE-EVENT TRANSFEREE") or (iv) any
subsequent transferee receiving transferred Rights from a Post-Event Transferee
or a Pre-Event Transferee, either directly or through one or more intermediate
transferees, shall become null and void without any further action and no holder
of such Rights shall have any rights whatsoever with respect to such Rights,
whether under any provision of this Agreement or otherwise. The Company shall
use all reasonable efforts to ensure that the provisions of this Section 7(e)
and Section 4(b) hereof are complied with, but shall have no liability to any
holder of Rights Certificates or to any other Person as a result of its failure
to make any determinations with respect to an Acquiring Person or any of such
Acquiring Person's Affiliates, Associates or transferees hereunder.

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

           Section 8. Cancellation and Destruction of Rights Certificates. All
Rights Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or to any of its
agents, be delivered to the Rights Agent for cancellation or in canceled form,
or, if surrendered to the Rights Agent, shall be canceled by it, and no Rights
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement. The Company shall deliver to the Rights
Agent for cancellation and retirement, and the Rights Agent shall so cancel and
retire, any Rights Certificate purchased or acquired by the Company otherwise
than upon the exercise thereof. The Rights Agent shall deliver all canceled
Rights Certificates to the Company, or shall, at the written request of the
Company, destroy such canceled Rights 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 use its
best efforts to cause to be reserved and kept available out of its authorized
and unissued Preferred Shares not reserved for another  

    
                                      -13-
<PAGE>   17
purpose (and, following the occurrence of a Triggering Event, out of its
authorized and unissued Common Shares and/or other securities), the number of
Preferred Shares (and, following the occurrence of the Triggering Event, Common
Shares and/or other securities) that will be sufficient to permit the exercise
in full of all outstanding Rights.

                     (b) If the Company shall hereafter list any of its
Preferred Shares on a national securities exchange, then so long as the
Preferred Shares (and, following the occurrence of a Trigger ing Event, Common
Shares and/or other securities) issuable and deliverable upon exercise of the
Rights may be listed on such exchange, the Company shall use its best efforts to
cause, from and after such time as the Rights become exercisable (but only to
the extent that it is reasonably likely that the Rights will be exercised), all
shares reserved for such issuance to be listed on such exchange upon official
notice of issuance upon such exercise.

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

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

                     (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 original issuance or delivery of
the Rights Certificates or of any Preferred Shares (or other securities of the
Company) upon the exercise of Rights. The Company shall not, however, be
required to pay any transfer tax which may be payable in respect of any transfer
or delivery of Rights Certificates to a person other 


                                      -14-
<PAGE>   18
than, or the issuance or delivery of certificates or depositary receipts for the
Preferred Shares (or other securities of the Company) in a name other than that
of, the registered holder of the Rights Certificate evidencing Rights
surrendered for exercise or to issue or to deliver any certificates or
depositary receipts for Preferred Shares (or other securities of the Company)
upon the exercise of any Rights until any such tax shall have been paid (any
such tax being payable by the holder of such Rights Certificate at the time of
surrender) or until it has been established to the Company's satisfaction that
no such tax is due.

           Section 10. Record Date. Each Person in whose name any certificate
for a number of one-thousandths of a Preferred Share (or other securities of
the Company) is issued upon the exercise of Rights shall for all purposes be
deemed to have become the holder of record of Preferred Shares (or other
securities of the Company) represented thereby on, and such certificate shall be
dated, the date upon which the Rights Certificate evidencing such Rights was
duly surrendered and payment of the Total Exercise Price with respect to which
the Rights have been exercised (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 are closed, such Person shall be deemed
to have become the record holder of such shares on, and such certificate shall
be dated, the next succeeding Business Day on which the transfer books of the
Company are open. Prior to the exercise of the Rights evidenced thereby, the
holder of a Rights Certificate shall not be entitled to any rights of a holder
of Preferred Shares (or other securities of the Company) for which the Rights
shall be exercisable, including, without limitation, the right to vote, to
receive dividends or other distributions or to exercise any preemptive rights,
and shall not be entitled to receive any notice of any proceedings of the
Company, except as provided herein.

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

                     (a) (i) Anything in this Agreement to the contrary
notwithstanding, in the event the Company shall at any time after the date of
this Agreement (A) declare a dividend on the Preferred Shares payable in
Preferred Shares, (B) subdivide the outstanding Preferred Shares, (C) combine
the outstanding Preferred Shares (by reverse stock split or otherwise) into a
smaller number of Preferred Shares, or (D) issue any shares of its capital stock
in a reclassification of the Preferred Shares (including any such
reclassification in connection with a consolidation or merger in which the
Company is the continuing or surviving corporation), then, in each such event,
except as otherwise provided in this Section 11 and Section 7(e) hereof: (1) the
Exercise Price in effect at the time of the record date for such dividend or of
the effective date of such subdivision, combination or reclassification shall be
adjusted so that the Exercise Price thereafter shall equal the result obtained
by dividing the Exercise Price in effect immediately prior to such time by a
fraction (the "ADJUSTMENT FRACTION"), the numerator of which shall be the total
number of Preferred Shares (or shares of capital stock issued in such
reclassification of the Preferred Shares) outstanding immediately following such
time and the denominator of which shall be the total number of Preferred Shares
outstanding immediately prior to such time; provided, however, that in no event
shall the consideration to be paid upon the exercise of one Right be less than
the aggregate par value of the shares of capital stock of the Company issuable
upon exercise of such Right; and (2) the number of one-thousandths of a
Preferred Share (or share of such other capital stock) issuable upon the
exercise of each Right shall equal the number of one-thousandths of a Preferred
Share (or share of such 


                                      -15-
<PAGE>   19
other capital stock) as was issuable upon exercise of a Right immediately prior
to the occurrence of the event described in clauses (A)-(D) of this Section
11(a)(i), multiplied by the Adjustment Fraction; provided, however, that, no
such adjustment shall be made pursuant to this Section 11(a)(i) to the extent
that there shall have simultaneously occurred an event described in clause (A),
(B), (C) or (D) of Section 11(n) with a proportionate adjustment being made
thereunder. Each Common Share that shall become outstanding after an adjustment
has been made pursuant to this Section 11(a)(i) shall have associated with it
the number of Rights, exercisable at the Exercise Price and for the number of
one-thousandths of a Preferred Share (or shares of such other capital stock) as
one Common Share has associated with it immediately following the adjustment
made pursuant to this Section 11(a)(i).

                     (ii) Subject to Section 24 of this Agreement, in the event
a Triggering Event shall have occurred, then promptly following such Triggering
Event each holder of a Right, except as provided in Section 7(e) hereof, shall
thereafter have the right to receive for each Right, upon exercise thereof in
accordance with the terms of this Agreement and payment of the Exercise Price in
effect immediately prior to the occurrence of the Triggering Event, in lieu of a
number of one-thousandths of a Preferred Share, such number of Common Shares of
the Company as shall equal the result obtained by multiplying the Exercise Price
in effect immediately prior to the occurrence of the Triggering Event by the
number of one-thousandths of a Preferred Share for which a Right was exercisable
(or would have been exercisable if the Distribution Date had occurred)
immediately prior to the first occurrence of a Triggering Event, and dividing
that product by 50% of the Current Per Share Market Price for Common Shares on
the date of occurrence of the Triggering Event; provided, however, that the
Exercise Price and the number of Common Shares of the Company so receivable upon
exercise of a Right shall be subject to further adjustment as appropriate in
accordance with Section 11(e) hereof to reflect any events occurring in respect
of the Common Shares of the Company after the occurrence of the Triggering
Event. Notwithstanding the foregoing provisions of this Section 11(a)(ii), the
right to buy Common Shares of the Company pursuant to Section 11(a)(ii) hereof
shall not arise as a result of any Person becoming an Acquiring Person through
an acquisition of Common Shares pursuant to a Permitted Offer.

                     (iii) In lieu of issuing Common Shares in accordance with
Section 11(a)(ii) hereof, the Company may, if a majority of the Continuing
Directors then in office determines that such action is necessary or appropriate
and not contrary to the interest of holders of Rights and, in the event that the
number of Common Shares which are authorized by the Company's Certificate of
Incorporation but not outstanding or reserved for issuance for purposes other
than upon exercise of the Rights are not sufficient to permit the exercise in
full of the Rights, or if any necessary regulatory approval for such issuance
has not been obtained by the Company, the Company shall: (A) determine the
excess of (1) the value of the Common Shares issuable upon the exercise of a
Right (the "CURRENT VALUE") over (2) the Exercise Price (such excess, the
"SPREAD") and (B) with respect to each Right, make adequate provision to
substitute for such Common Shares, upon exercise of the Rights, (1) cash, (2) a
reduction in the Exercise Price, (3) other equity securities of the Company
(including, without limitation, shares or units of shares of any series of
preferred stock which a majority of the Continuing Directors then in office has
deemed to have the same value as Common Shares (such shares or units of shares
of preferred stock are herein called "COMMON STOCK EQUIVALENTS")), except to the
extent that the Company has not obtained any necessary shareholder or regulatory
approval for such issuance, (4) debt securities of the Company, except to the
extent that the Company has not obtained any necessary shareholder or regulatory
approval 



                                      -16-
<PAGE>   20
for such issuance, (5) other assets or (6) any combination of the foregoing,
having an aggregate value equal to the Current Value, where such aggregate value
has been determined by a majority of the Continuing Directors then in office
based upon the advice of a nationally recognized investment banking firm
selected by a majority of the Continuing Directors then in office; provided,
however, if the Company shall not have made adequate provision to deliver value
pursuant to clause (B) above within thirty (30) days following the later of (x)
the first occurrence of a Triggering Event and (y) the date on which the
Company's right of redemption pursuant to Section 23(a) expires (the later of
(x) and (y) being referred to herein as the "SECTION 11(A)(II) TRIGGER DATE"),
then the Company shall be obligated to deliver, upon the surrender for exercise
of a Right and without requiring payment of the Exercise Price, Common Shares
(to the extent available), except to the extent that the Company has not
obtained any necessary shareholder or regulatory approval for such issuance, and
then, if necessary, cash, which shares and/or cash have an aggregate value equal
to the Spread. If a majority of the Continuing Directors then in office shall
determine in good faith that it is likely that sufficient additional Common
Shares could be authorized for issuance upon exercise in full of the Rights or
that any necessary regulatory approval for such issuance will be obtained, the
thirty (30) day period set forth above may be extended to the extent necessary,
but not more than ninety (90) days after the Section 11(a)(ii) Trigger Date, in
order that the Company may seek shareholder approval for the authorization of
such additional shares or take action to obtain such regulatory approval (such
period, as it may be extended, the "SUBSTITUTION PERIOD"). To the extent that
the Company determines that some action need be taken pursuant to the first
and/or second sentences of this Section 11(a)(iii), the Company (x) shall
provide, subject to Section 7(e) hereof, that such action shall apply uniformly
to all outstanding Rights and (y) may suspend the exercisability of the Rights
until the expiration of the Substitution Period in order to seek any
authorization of additional shares, to take any action to obtain any required
regulatory approval and/or to decide the appropriate form of distribution to be
made pursuant to such first sentence and to determine the value thereof. In the
event of any such suspen sion, the Company shall issue a public announcement
stating that the exercisability of the Rights has been temporarily suspended, as
well as a public announcement at such time as the suspension is no longer in
effect. For purposes of this Section 11(a)(iii), the value of the Common Shares
shall be the Current Per Share Market Price of the Common Shares on the Section
11(a)(ii) Trigger Date and the value of any Common Stock Equivalent shall be
deemed to have the same value as the Common Shares on such date.

                     (b) In case the Company shall, at any time after the date
of this Agreement, fix a record date for the issuance of rights, options or
warrants to all holders of Preferred Shares entitling such holders (for a period
expiring within forty-five (45) calendar days after such record date) to
subscribe for or purchase Preferred Shares or Equivalent Shares or securities
convertible into Preferred Shares or Equivalent Shares at a price per share (or
having a conversion price per share, if a security convertible into Preferred
Shares or Equivalent Shares) less than the then Current Per Share Market Price
of the Preferred Shares or Equivalent Shares on such record date, then, in each
such case, the Exercise Price to be in effect after such record date shall be
determined by multiplying the Exercise Price in effect immediately prior to such
record date by a fraction, the numerator of which shall be the number of
Preferred Shares and Equivalent Shares (if any) outstanding on such record date,
plus the number of Preferred Shares or Equivalent Shares, as the case may be,
which the aggregate offering price of the total number of Preferred Shares or
Equivalent Shares, as the case may be, to be offered or issued (and/or the
aggregate initial conversion price of the convertible securities to be offered
or issued) would purchase 



                                      -17-
<PAGE>   21
at such current market price, and the denominator of which shall be the number
of Preferred Shares and Equivalent Shares (if any) outstanding on such record
date, plus the number of additional Preferred Shares or Equivalent Shares, as
the case may be, to be offered for subscription or purchase (or into which the
convertible securities so to be offered are initially convertible); provided,
however, that in no event shall the consideration to be paid upon the exercise
of one Right be less than the aggregate par value of the shares of capital stock
of the Company issuable upon exercise of one Right. In case such subscription
price may be paid in a consideration part or all of which shall be in a form
other than cash, the value of such consideration shall be as determined in good
faith by a majority of the Continuing Directors then in office, whose
determination shall be described in a statement filed with the Rights Agent and
shall be binding on the Rights Agent and the holders of the Rights. Preferred
Shares and Equivalent Shares owned by or held for the account of the Company
shall not be deemed outstanding for the purpose of any such computation. Such
adjustment shall be made successively whenever such a record date is fixed, and
in the event that such rights, options or warrants are not so issued, the
Exercise Price shall be adjusted to be the Exercise Price which would then be in
effect if such record date had not been fixed.

                     (c) In case the Company shall, at any time after the date
of this Agreement, fix a record date for the making of a distribution to all
holders of the Preferred Shares or of any class or series of Equivalent Shares
(including any such distribution made in connection with a consolidation or
merger in which the Company is the continuing or surviving corporation) of
evidences of indebted ness or assets (other than a regular quarterly cash
dividend, if any, or a dividend payable in Preferred Shares) or subscription
rights, options or warrants (excluding those referred to in Section 11(b)),
then, in each such case, the Exercise Price to be in effect after such record
date shall be determined by multiplying the Exercise Price in effect immediately
prior to such record date by a fraction, the numerator of which shall be the
Current Per Share Market Price of a Preferred Share or an Equivalent Share on
such record date, less the fair market value per Preferred Share or Equivalent
Share (as determined in good faith by the Board of Directors of the Company,
whose determination shall be described in a statement filed with the Rights
Agent) of the portion of the cash, assets or evidences of indebtedness so to be
distributed or of such subscription rights or warrants applicable to a Preferred
Share or Equivalent Share, as the case may be, and the denominator of which
shall be such Current Per Share Market Price of a Preferred Share or Equivalent
Share on such record date; provided, however, that in no event shall the
consideration to be paid upon the exercise of one Right be less than the
aggregate par value of the shares of capital stock of the Company issuable upon
exercise of one Right. Such adjustments shall be made successively whenever such
a record date is fixed, and in the event that such distribution is not so made,
the Exercise Price shall be adjusted to be the Exercise Price which would have
been in effect if such record date had not been fixed.

                     (d) Anything herein to the contrary notwithstanding, no
adjustment in the Exercise Price shall be required unless such adjustment would
require an increase or decrease of at least 1% in the Exercise Price; provided,
however, that any adjustments which by reason of this Section 11(d) are not
required to be made shall be carried forward and taken into account in any
subsequent adjustment. All calculations under this Section 11 shall be made to
the nearest cent or to the nearest ten-thousandth of a Common Share or other
share or one hundred-thousandth of a Preferred Share, as the case may be.
Notwithstanding the first sentence of this Section 11(d), any adjustment
required by this Section 11 shall
 

                                      -18-
<PAGE>   22
be made no later than the earlier of (i) three (3) years from the date of the
transaction which requires such adjustment or (ii) the Expiration Date.

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

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

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

                     (h) The Company may elect on or after the date of any
adjustment of the Exercise Price as a result of the calculations made in Section
11(b) or (c) to adjust the number of Rights, in substitution for any adjustment
in the number of Preferred Shares purchasable upon the exercise of a Right. Each
of the Rights outstanding after such adjustment of the number of Rights shall be
exercisable for the number of one-thousandths of a Preferred Share for which a
Right was exercisable immediately prior to such adjustment. Each Right held of
record prior to such adjustment of the number of Rights shall become that number
of Rights (calculated to the nearest one hundred-thousandth) obtained by
dividing the Exercise Price in effect immediately prior to adjustment of the
Exercise Price by the Exercise Price in effect immediately after adjustment of
the Exercise Price. The Company shall make a public announcement of its election
to adjust the number of Rights, indicating the record date for the adjustment,
and, if known at the time, the amount of the adjustment to be made. This record
date may be the date on which the Exercise Price is adjusted or any day
thereafter, but, if the Rights Certificates have been issued, shall be at least
ten (10) days later than the date of the public announcement. If Rights
Certificates have been issued, upon each adjustment of the number of Rights
pursuant to this Section 11(h), the Company shall, as promptly as practicable,
cause to be distributed to holders of record of Rights Certificates on such
record date Rights Certificates evidencing, subject to Section 14 hereof, the
additional Rights to which such holders shall be entitled as a result of such
adjustment, or, at the option of the Company, shall cause to be distributed to
such holders of record in substitution and replacement 


                                      -19-
<PAGE>   23
for the Rights Certificates held by such holders prior to the date of
adjustment, and upon surrender thereof, if required by the Company, new Rights
Certificates evidencing all the Rights to which such holders shall be entitled
after such adjustment. Rights Certificates so to be distributed shall be issued,
executed and countersigned in the manner provided for herein (and may bear, at
the option of the Company, the adjusted Exercise Price) and shall be registered
in the names of the holders of record of Rights Certificates on the record date
specified in the public announcement.

                     (i) Irrespective of any adjustment or change in the
Exercise Price or the number of Preferred Shares issuable upon the exercise of
the Rights, the Rights Certificates theretofore and thereafter issued may
continue to express the Exercise Price per one one-thousandth of a Preferred
Share and the number of one-thousandths of a Preferred Share which were
expressed in the initial Rights Certificates issued hereunder.

                     (j) Before taking any action that would cause an adjustment
reducing the Exercise Price below the par or stated value, if any, of the number
of one-thousandths of a Preferred Share issuable upon exercise of the Rights,
the Company shall take any corporate action which may, in the opinion of its
counsel, be necessary in order that the Company may validly and legally issue as
fully paid and nonassessable shares such number of one-thousandths of a
Preferred Share at such adjusted Exercise Price.

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

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

                     (m) The Company covenants and agrees that, after the
Distribution Date, it will not, except as permitted by Sections 23, 24 or 27
hereof, take (or permit to be taken) any action if at the time such action is
taken it is reasonably foreseeable that such action will diminish substantially
or otherwise eliminate the benefits intended to be afforded by the Rights.


                                      -20-
<PAGE>   24
                     (n) In the event the Company shall at any time after the
date of this Agreement (A) declare a dividend on the Common Shares payable in
Common Shares, (B) subdivide the outstanding Common Shares, (C) combine the
outstanding Common Shares (by reverse stock split or otherwise) into a smaller
number of Common Shares, or (D) issue any shares of its capital stock in a
reclassification of the Common Shares (including any such reclassification in
connection with a consolidation or merger in which the Company is the continuing
or surviving corporation), then, in each such event, except as otherwise
provided in this Section 11(a) and Section 7(e) hereof: (1) each Common Share
(or shares of capital stock issued in such reclassification of the Common
Shares) outstanding immediately following such time shall have associated with
it the number of Rights as were associated with one Common Share immediately
prior to the occurrence of the event described in clauses (A)-(D) above; (2) the
Exercise Price in effect at the time of the record date for such dividend or of
the effective date of such subdivision, combination or reclassification shall be
adjusted so that the Exercise Price thereafter shall equal the result obtained
by multiplying the Exercise Price in effect immediately prior to such time by a
fraction, the numerator of which shall be the total number of Common Shares
outstanding immediately prior to the event described in clauses (A)-(D) above,
and the denominator of which shall be the total number of Common Shares
outstanding immediately after such event; provided, however, that in no event
shall the consideration to be paid upon the exercise of one Right be less than
the aggregate par value of the shares of capital stock of the Company issuable
upon exercise of such Right; and (3) the number of one-thousandths of a
Preferred Share (or shares of such other capital stock) issuable upon the
exercise of each Right outstanding after such event shall equal the number of
one-thousandths of a Preferred Share (or shares of such other capital stock) as
were issuable with respect to one Right immediately prior to such event. Each
Common Share that shall become outstanding after an adjustment has been made
pursuant to this Section 11(n) shall have associated with it the number of
Rights, exercisable at the Exercise Price and for the number of one-thousandths
of a Preferred Share (or shares of such other capital stock) as one Common Share
has associated with it immediately following the adjustment made pursuant to
this Section 11(n). If an event occurs which would require an adjustment under
both this Section 11(n) and Section 11(a)(ii) hereof, the adjustment provided
for in this Section 11(n) shall be in addition to, and shall be made prior to,
any adjustment required pursuant to Section 11(a)(ii) hereof.

           Section 12. Certificate of Adjusted Exercise Price or Number of
Shares. Whenever an adjustment is made as provided in Sections 11 and 13 hereof,
the Company shall promptly (a) prepare a certificate setting forth such
adjustment and a brief statement of the facts accounting for such adjustment,
(b) 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 Rights Certificate in accordance with Section 26 hereof.
Notwithstanding the foregoing sentence, the failure of the Company to make such
certification or give such notice shall not affect the validity of such
adjustment or the force or effect of the requirement for such adjustment. The
Rights Agent shall be fully protected in relying on any such certificate and on
any adjustment contained therein and shall not be deemed to have knowledge of
such adjustment unless and until it shall have received such certificate.

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

                  (a) In the event that, following a Triggering Event, directly
or indirectly:


                                      -21-
<PAGE>   25
                     (i) the Company shall consolidate with, or merge with and
into, any other Person (other than a wholly-owned Subsidiary of the Company in a
transaction the principal purpose of which is to change the state of
incorporation of the Company and which complies with Section 11(m) hereof);

                     (ii) any Person shall consolidate with the Company, or
merge with and into the Company and the Company shall be the continuing or
surviving corporation of such consolidation or merger and, in connection with
such merger, all or part of the Common Shares shall be changed into or exchanged
for stock or other securities of any other person (or the Company); or

                     (iii) the Company shall sell or otherwise transfer (or one
or more of its Subsidiaries shall sell or otherwise transfer), in one or more
transactions, assets or earning power aggregating 50% or more of the assets or
earning power of the Company and its Subsidiaries (taken as a whole) to any
other Person or Persons (other than the Company or one or more of its wholly
owned Subsidiaries in one or more transactions, each of which individually (and
together) complies with Section 11(m) hereof),

                           then, concurrent with and in each such case,

                           (A) each holder of a Right (except as provided in
Section 7(e) hereof) shall thereafter have the right to receive, upon the
exercise thereof at a price equal to the Total Exercise Price applicable
immediately prior to the occurrence of the Section 13 Event in accordance with
the terms of this Agreement, such number of validly authorized and issued, fully
paid, nonassessable and freely tradeable Common Shares of the Principal Party
(as hereinafter defined), free of any liens, encumbrances, rights of first
refusal or other adverse claims, as shall be equal to the result obtained by
dividing such Total Exercise Price by 50% of the Current Per Share Market Price
of the Common Shares of such Principal Party on the date of consummation of such
Section 13 Event, provided, however, that the Exercise Price and the number of
Common Shares of such Principal Party so receivable upon exercise of a Right
shall be subject to further adjustment as appropriate in accordance with Section
11(e) hereof;

                           (B) such Principal Party shall thereafter be liable
for, and shall assume, by virtue of such Section 13 Event, all the obligations
and duties of the Company pursuant to this Agreement;

                           (C) the term "Company" shall thereafter be deemed to
refer to such Principal Party, it being specifically intended that the
provisions of Section 11 hereof shall apply only to such Principal Party
following the first occurrence of a Section 13 Event;

                           (D) such Principal Party shall take such steps
(including, but not limited to, the reservation of a sufficient number of its
Common Shares) in connection with the consummation of any such transaction as
may be necessary to ensure that the provisions hereof 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



                                      -22-
<PAGE>   26
                           (E) upon the subsequent occurrence of any
consolidation, merger, sale or transfer of assets or other extraordinary
transaction in respect of such Principal Party, each holder of a Right shall
thereupon be entitled to receive, upon exercise of a Right and payment of the
Total Exercise Price as provided in this Section 13(a), such cash, shares,
rights, warrants and other property which such holder would have been entitled
to receive had such holder, at the time of such transaction, owned the Common
Shares of the Principal Party receivable upon the exercise of such Right
pursuant to this Section 13(a), and such Principal Party shall take such steps
(including, but not limited to, reservation of shares of stock) as may be
necessary to permit the subsequent exercise of the Rights in accordance with the
terms hereof for such cash, shares, rights, warrants and other property.

                           (F) For purposes hereof, the "earning power" of the
Company and its Subsidiaries shall be determined in good faith by the Company's
Board of Directors on the basis of the operating earnings of each business
operated by the Company and its Subsidiaries during the three fiscal years
preceding the date of such determination (or, in the case of any business not
operated by the Company or any Subsidiary during three full fiscal years
preceding such date, during the period such business was operated by the Company
or any Subsidiary).

                     (b)    For purposes of this Agreement, the term "PRINCIPAL 
                            PARTY" shall mean:

                           (i) in the case of any transaction described in
clause (i) or (ii) of Section 13(a) hereof: (A) the Person that is the issuer of
the securities into which the Common Shares are converted in such merger or
consolidation, or, if there is more than one such issuer, the issuer the Common
Shares of which have the greatest aggregate market value of shares outstanding,
or (B) if no securities are so issued, (x) the Person that is the other party to
the merger, if such Person survives said merger, or, if there is more than one
such Person, the Person the Common Shares of which have the greatest aggregate
market value of shares outstanding or (y) if the Person that is the other party
to the merger does not survive the merger, the Person that does survive the
merger (including the Company if it survives) or (z) the Person resulting from
the consolidation; and

                           (ii) in the case of any transaction described in
clause (iii) of Section 13(a) hereof, the Person that is the party receiving the
greatest portion of the assets or earning power transferred pursuant to such
transaction or transactions, or, if more than one Person that is a party to such
transaction or transactions receives the same portion of the assets or earning
power so transferred and each such portion would, were it not for the other
equal portions, constitute the greatest portion of the assets or earning power
so transferred, or if the Person receiving the greatest portion of the assets or
earning power cannot be determined, whichever of such Persons is the issuer of
Common Shares having the greatest aggregate market value of shares outstanding;

provided, however, that in any such case described in the foregoing clause
(b)(i) or (b)(ii), if the Common Shares of such Person are not at such time or
have not been continuously over the preceding 12-month period registered under
Section 12 of the Exchange Act, then (1) if such Person is a direct or indirect
Subsidiary of another Person the Common Shares of which are and have been so
registered, the term "Principal Party" shall refer to such other Person, or (2)
if such Person is a Subsidiary, directly or indirectly, of more than one Person,
the Common Shares of which are and have been so registered, the 


                                      -23-
<PAGE>   27
term "Principal Party" shall refer to whichever of such Persons is the issuer of
Common Shares having the greatest aggregate market value of shares outstanding,
or (3) if such Person is owned, directly or indirectly, by a joint venture
formed by two or more Persons that are not owned, directly or indirectly by the
same Person, the rules set forth in clauses (1) and (2) above shall apply to
each of the owners having an interest in the venture as if the Person owned by
the joint venture was a Subsidiary of both or all of such joint venturers, and
the Principal Party in each such case shall bear the obligations set forth in
this Section 13 in the same ration as its interest in such Person bears to the
total of such interests.

                     (c) The Company shall not consummate any Section 13 Event
unless the Principal Party shall have a sufficient number of authorized Common
Shares that have not been issued or reserved for issuance to permit the exercise
in full of the Rights in accordance with this Section 13 and unless prior
thereto the Company and such issuer shall have executed and delivered to the
Rights Agent a supplemental agreement confirming that such Principal Party
shall, upon consummation of such Section 13 Event, assume this Agreement in
accordance with Sections 13(a) and 13(b) hereof, that all rights of first
refusal or preemptive rights in respect of the issuance of Common Shares of such
Principal Party upon exercise of outstanding Rights have been waived, that there
are no rights, warrants, instruments or securities outstanding or any agreements
or arrangements which, as a result of the consummation of such transaction,
would eliminate or substantially diminish the benefits intended to be afforded
by the Rights and that such transaction shall not result in a default by such
Principal Party under this Agreement, and further providing that, as soon as
practicable after the date of such Section 13 Event, such Principal Party will:

                           (i) prepare and file a registration statement under
the Securities Act with respect to the Rights and the securities purchasable
upon exercise of the Rights on an appropriate form, use its best efforts to
cause such registration statement to become effective as soon as practicable
after such filing and use its best efforts to 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 similarly comply with
applicable state securities laws;

                           (ii) use its best efforts to list (or continue the
listing of) the Rights and the securities purchasable upon exercise of the
Rights on a national securities exchange or to meet the eligibility requirements
for quotation on Nasdaq and list (or continue the listing of) the Rights and the
securities purchasable upon exercise of the Rights on Nasdaq; and

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

           In the event that at any time after the occurrence of a Triggering
Event some or all of the Rights shall not have been exercised at the time of a
transaction described in this Section 13, the Rights which have not theretofore
been exercised shall thereafter be exercisable in the manner described in
Section 13(a) (without taking into account any prior adjustment required by
Section 11(a)(ii)).


                                      -24-
<PAGE>   28
                     (d) In case the "Principal Party" for purposes of Section
13(b) hereof has provision in any of its authorized securities or in its
certificate of incorporation or by-laws or other instrument governing its
corporate affairs, which provision would have the effect of (i) causing such
Principal Party to issue (other than to holders of Rights pursuant to Section 13
hereof), in connection with, or as a consequence of, the consummation of a
Section 13 Event, Common Shares or Equivalent Shares of such Principal Party at
less than the then Current Per Share Market Price thereof or securities
exercisable for, or convertible into, Common Shares or Equivalent Shares of such
Principal Party at less than such then Current Per Share Market Price, or (ii)
providing for any special payment, tax or similar provision in connection with
the issuance of the Common Shares of such Principal Party pursuant to the
provisions of Section 13 hereof, then, in such event, the Company hereby agrees
with each holder of Rights that it shall not consummate any such transaction
unless prior thereto the Company and such Principal Party shall have executed
and delivered to the Rights Agent a supplemental agreement providing that the
provision in question of such Principal Party shall have been canceled, waived
or amended, or that the authorized securities shall be redeemed, so that the
applicable provision will have no effect in connection with or as a consequence
of, the consummation of the proposed transaction.

                     (e) The Company covenants and agrees that it shall not, at
any time after the Distribution Date, effect or permit to occur any Section 13
Event, if (i) at the time or immediately after such Section 13 Event there are
any rights, warrants or other instruments or securities outstanding or
agreements in effect which would substantially diminish or otherwise eliminate
the benefits intended to be afforded by the Rights, (ii) prior to,
simultaneously with or immediately after such Section 13 Event, the shareholders
of the Person who constitutes, or would constitute, the "Principal Party" for
purposes of Section 13(b) hereof shall have received a distribution of Rights
previously owned by such Person or any of its Affiliates or Associates or (iii)
the form or nature of organization of the Principal Party would preclude or
limit the exercisability of the Rights.

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

                     (g) The provisions of this Section 13 shall similarly apply
to successive mergers or consolidations or sales or other transfers.

           Section 14.    Fractional Rights and Fractional Shares.

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


                                      -25-
<PAGE>   29
otherwise be issuable, an amount in cash equal to the same fraction of the
current market value of a whole Right. For the purposes of this Section 14(a),
the current market value of a whole Right shall be the closing price of the
Rights for the Trading Day immediately prior to the date on which such
fractional Rights would have been otherwise issuable, as determined pursuant to
the second sentence of Section 1(k) hereof.

                     (b) The Company shall not be required to issue fractions of
Preferred Shares (other than fractions that are integral multiples of one
one-thousandth of a Preferred Share) upon exercise of the Rights or to
distribute certificates which evidence fractional Preferred Shares (other than
fractions that are integral multiples of one one-thousandth of a Preferred
Share). Interests in fractions of Preferred Shares in integral multiples of one
one-thousandth of a Preferred Share may, at the election of the Company, be
evidenced by depositary receipts, pursuant to an appropriate agreement between
the Company and a depositary selected by it; provided, that such agreement shall
provide that the holders of such depositary receipts shall have all the rights,
privileges and preferences to which they are entitled as beneficial owners of
the Preferred Shares represented by such depositary receipts. In lieu of
fractional Preferred Shares that are not integral multiples of one
one-thousandth of a Preferred Share, the Company shall pay to the registered
holders of Rights Certificates at the time such Rights are exercised as herein
provided an amount in cash equal to the same fraction of the current market
value of a Preferred Share. For purposes of this Section 14(b), the current
market value of a Preferred Share shall be one thousand times the closing price
of a Common Share (as determined pursuant to the second sentence of Section 1(k)
hereof) for the Trading Day immediately prior to the date of such exercise.

                     (c) The Company shall not be required to issue fractions of
Common Shares or to distribute certificates which evidence fractional Common
Shares upon the exercise or exchange of Rights. In lieu of such fractional
Common Shares, the Company shall pay to the registered holders of Rights
Certificates at the time such Rights are exercised as herein provided an amount
in cash equal to the same fraction of the current market value of a Common
Share. For purposes of this Section 14(c), the current market value of a Common
Share shall be the closing price of a Common Share (as determined pursuant to
the second sentence of Section 1(k) hereof) for the Trading Day immediately
prior to the date of such exercise.

                     (d) The holder of a Right by the acceptance of the Right
expressly waives his or her right to receive any fractional Rights or any
fractional shares (other than fractions that are integral multiples of one
one-thousandth of a Preferred Share) upon exercise of a Right.

           Section 15. Rights of Action. All rights of action in respect of this
Agreement, excepting the rights of action given to the Rights Agent under
Section 18 hereof, are vested in the respective registered holders of the Rights
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Shares); and any registered holder of any Rights 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 Rights Certificate (or, prior to the
Distribution Date, of the Common Shares), may, in his or her own behalf and for
his or her 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 or her right to exercise the Rights evidenced by such Rights Certificate in
the manner provided in such Rights Certificate and in this Agreement.


                                      -26-
<PAGE>   30
Without limiting the foregoing or any remedies available to the holders of
Rights, it is specifically acknowledged that the holders of Rights would not
have an adequate remedy at law for any breach of this Agreement and will be
entitled to specific performance of the obligations under, and injunctive relief
against actual or threatened violations of, the obligations of any Person
subject to this Agreement.

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

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

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

                     (c) subject to Sections 6(a) and 7(f) hereof, the Company
and the Rights Agent may deem and treat the person in whose name the Rights
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
Rights Certificates or the associated Common Shares certificate 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.

           Section 17. Rights Certificate Holder Not Deemed a Shareholder. No
holder, as such, of any Rights Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose to be the holder of the Preferred Shares
or any other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Rights Certificate be construed to confer upon the holder of any
Rights Certificate, as such, any of the rights of a shareholder of the Company
or any right to vote for the election of directors or upon any matter submitted
to shareholders at any meeting thereof, or to give or withhold consent to any
corporate action, or to receive notice of meetings or other actions affecting
shareholders (except as provided in Section 25 hereof), or to receive dividends
or subscription rights, or otherwise, until the Right or Rights evidenced by
such Rights Certificate shall have been exercised in accordance with the
provisions hereof.

           Section 18.   Concerning the Rights Agent.

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


                                      -27-
<PAGE>   31
including the costs and expenses of defending against any claim of liability in
the premises. In no event will the Rights Agent be liable for special, indirect,
incidental or consequential loss or damage of any kind whatsoever, even if the
Rights Agent has been advised of the possibility of such loss or damage.

                     (b) The Rights Agent shall be protected and shall incur no
liability for, or in respect of any action taken, suffered or omitted by it in
connection with, its administration of this Agreement in reliance upon any
Rights Certificate or certificate for the Preferred Shares or 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 reasonably believed by it to
be genuine and to be signed, executed and, where necessary, verified or
acknowledged, by the proper Person or Persons, or otherwise upon the advice of
counsel as set forth in Section 20 hereof.

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

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

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

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

                     (a) The Rights Agent may consult with legal counsel (who
may be legal counsel for the Company), and the written advice or opinion of such
counsel shall be full and complete authorization



                                      -28-
<PAGE>   32
and protection to the Rights Agent as to any action taken or omitted by it in
good faith and in accordance with such written advice or opinion.

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

                     (c) The Rights Agent shall be liable hereunder to the
Company and any other Person only for its own negligence, bad faith or willful
misconduct.

                     (d) The Rights Agent shall not be liable for or by reason
of any of the statements of fact or recitals contained in this Agreement or in
the Rights Certificates (except 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 Agreement or the execution and delivery
hereof (except the due execution hereof by the Rights Agent) or in respect of
the validity or execution of any Rights Certificate (except its countersignature
thereof); nor shall it be responsible for any breach by the Company of any
covenant or condition contained in this Agreement or in any Rights Certificate;
nor shall it be responsible for any change in the exercisability of the Rights
or any adjustment in the terms of the Rights (including the manner, method or
amount thereof) provided for in Sections 3, 11, 13, 23 or 24, or the
ascertaining of the existence of facts that would require any such change or
adjustment (except with respect to the exercise of Rights evidenced by Rights
Certificates after receipt by the Rights Agent of a certificate furnished
pursuant to Section 12 describing such change or 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 to be issued pursuant to
this Agreement or any Rights Certificate or as to whether any Preferred Shares
will, when issued, be validly authorized and issued, fully paid and
nonassessable.

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

                     (g) The Rights Agent is hereby authorized and directed to
accept instructions with respect to the performance of its duties hereunder from
any one of the Chairman of the Board, the Chief Executive Officer, the
President, any Vice President, the Chief Financial Officer, the Secretary or any


                                      -29-
<PAGE>   33
Assistant Secretary of the Company, and to apply to such officers for advice or
instructions in connection with its duties, and it shall not be liable for any
action taken or suffered by it in good faith in accordance with instructions of
any such officer or for any delay in acting while waiting for those
instructions. Any application by the Rights Agent for written instructions from
the Company may, at the option of the Rights Agent, set forth in writing any
action proposed to be taken or omitted by the Rights Agent under this Rights
Agreement and the date on and/or after which such action shall be taken or such
omission shall be effective. The Rights Agent shall not be liable for any action
taken by, or omission of, the Rights Agent in accordance with a proposal
included in any such application on or after the date specified in such
application (which date shall not be less than five (5) Business Days after the
date any officer of the Company actually receives such application, unless any
such officer shall have consented in writing to an earlier date) unless, prior
to taking any such action (or the effective date in the case of an omission),
the Rights Agent shall have received written instructions in response to such
application specifying the action to be taken or omitted.

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

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

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

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

           Section 21. Change of Rights Agent. The Rights Agent or any successor
Rights Agent may resign and be discharged from its duties under this Agreement
upon thirty (30) days' notice in writing mailed to the Company and to each
transfer agent of the Preferred Shares and the Common Shares by registered or
certified mail, and to the holders of the Rights Certificates by first-class
mail. The Company may remove the Rights Agent or any successor Rights Agent upon
thirty (30) days' notice in writing, mailed to the Rights Agent or successor
Rights Agent, as the case may be, and to each transfer agent of 


                                      -30-
<PAGE>   34
the Preferred Shares and the Common Shares by registered or certified mail, and
to the holders of the Rights Certificates by first-class mail. If the Rights
Agent shall resign or be removed or shall otherwise become incapable of acting,
the Company shall appoint a successor to the Rights Agent. If the Company shall
fail to make such appointment within a period of thirty (30) days after giving
notice of such removal or after it has been notified in writing of such
resignation or incapacity by the resigning or incapacitated Rights Agent or by
the holder of a Rights Certificate (who shall, with such notice, submit his or
her Rights Certificate for inspection by the Company), then the registered
holder of any Rights Certificate may apply to any court of competent
jurisdiction for the appointment of a new Rights Agent. Any successor Rights
Agent, whether appointed by the Company or by such a court, shall be a
corporation organized and doing business under the laws of the United States or
of any state of the United States, in good standing, which is authorized under
such laws to exercise corporate trust or shareholder services 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 million. 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 Preferred Shares and the Common Shares, and mail a notice thereof in writing
to the registered holders of the Rights Certificates. Failure to give any notice
provided for in this Section 21, however, or any defect therein, shall not
affect the legality or validity of the resignation or removal of the Rights
Agent or the appointment of the successor Rights Agent, as the case may be.

           Section 22. Issuance of New Rights Certificates. Notwithstanding any
of the provisions of this Agreement or of the Rights to the contrary, the
Company may, at its option, issue new Rights Certificates evidencing Rights in
such form as may be approved by its Board of Directors to reflect any adjustment
or change in the Exercise Price and the number or kind or class of shares or
other securities or property purchasable under the Rights Certificates made in
accordance with the provisions of this Agreement. In addition, in connection
with the issuance or sale of Common Shares following the Distribution Date and
prior to the redemption or expiration of the Rights, 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 other securities of the Company outstanding at the
date hereof or upon the exercise, conversion or exchange of securities
hereinafter issued by the Company and (b) may, in any other case, if deemed
necessary or appropriate by the Board of Directors of the Company, issue Rights
Certificates representing the appropriate number of Rights in connection with
such issuance or sale; provided, however, that (i) no such Rights Certificate
shall be issued and this sentence shall be null and void ab initio if, and to
the extent that, such issuance or this sentence would create a significant risk
of or result in material adverse tax consequences to the Company or the Person
to whom such Rights Certificate would be issued or would create a significant
risk of or result in such options' or employee plans' or arrangements' failing
to qualify for otherwise available special tax treatment and (ii) no such Rights
Certificate shall be issued if, and to the extent that, appropriate adjustment
shall otherwise have been made in lieu of the issuance thereof.


                                      -31-
<PAGE>   35
           Section 23.   Redemption.

                     (a) The Company may, at its option and with the approval of
the Board of Directors, at any time prior to the Close of Business on the
earlier of (i) the tenth day following the Shares Acquisition Date (or such
later date as may be determined by action of a majority of Continuing Directors
then in office and publicly announced by the Company) and (ii) the Final
Expiration Date, redeem all but not less than all the then outstanding Rights at
a redemption price of $0.01 per Right, appropriately adjusted to reflect any
stock split, stock dividend or similar transaction occurring after the date
hereof (such redemption price being herein referred to as the "REDEMPTION
PRICE") and the Company may, at its option, pay the Redemption Price either in
Common Shares (based on the Current Per Share Market Price thereof at the time
of redemption) or cash. Such redemption of the Rights by the Company may be made
effective at such time, on such basis and with such conditions as the Board of
Directors in its sole discretion may establish; provided, however, if the Board
of Directors of the Company authorizes redemption of the Rights on or after the
time a Person becomes an Acquiring Person, then there must be Continuing
Directors then in office and such authorization shall require the concurrence of
a majority of such Continuing Directors. The date on which the Board of
Directors elects to make the redemption effective shall be referred to as the
"REDEMPTION DATE."

                     (b) Immediately upon the action of the Board of Directors
of the Company ordering the redemption of the Rights, evidence of which shall
have been filed with the Rights Agent, and without any further action and
without any notice, the right to exercise the Rights will terminate and the only
right thereafter of the holders of Rights shall be to receive the Redemption
Price. The Company shall promptly give public notice of any such redemption;
provided, however, that the failure to give or any defect in, any such notice
shall not affect the validity of such redemption. Within ten (10) days after the
action of the Board of Directors ordering the redemption of the Rights, the
Company shall give notice of such redemption to the Rights Agent and the holders
of the then outstanding Rights by mailing such notice to all such holders at
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. Any notice which is mailed in the manner herein provided
shall be deemed given, whether or not the holder receives the notice. Each such
notice of redemption will state the method by which the payment of the
Redemption Price will be made. Neither the Company nor any of its Affiliates or
Associates may redeem, acquire or purchase for value any Rights at any time in
any manner other than that specifically set forth in this Section 23 or in
Section 24 hereof, and other than in connection with the purchase of Common
Shares prior to the Distribution Date.

           Section 24.   Exchange.

                     (a) Subject to applicable laws, rules and regulations, and
subject to subsection 24(c) below, the Company may, at its option, by majority
vote of the Board of Directors and a majority vote of the Continuing Directors,
at any time after the occurrence of a Triggering Event, exchange all or part of
the then outstanding and exercisable Rights (which shall not include Rights that
have become void pursuant to the provisions of Section 7(e) hereof) for Common
Shares at an exchange ratio of one Common Share per Right, appropriately
adjusted to reflect any stock split, stock dividend or similar transaction
occurring after the date hereof (such exchange ratio being hereinafter referred
to as the 


                                      -32-
<PAGE>   36
"EXCHANGE RATIO"). Notwithstanding the foregoing, the Board of Directors shall
not be empowered to effect such exchange at any time after any Person (other
than the Company, any Subsidiary of the Company, any employee benefit plan of
the Company or any such Subsidiary, or any entity holding Common Shares for or
pursuant to the terms of any such plan), together with all Affiliates and
Associates of such Person, becomes the Beneficial Owner of 50% or more of the
Common Shares then outstanding.

                     (b) Immediately upon the action of the Board of Directors
ordering the exchange of any Rights pursuant to subsection 24(a) of this Section
24 and without any further action and without any notice, the right to exercise
such Rights shall terminate and the only right thereafter of a holder of such
Rights shall be to receive that number of Common Shares equal to the number of
such Rights held by such holder multiplied by the Exchange Ratio. The Company
shall 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 shall mail a notice of any such exchange to all of
the holders of such Rights at their last addresses as they appear upon the
registry books of the Rights Agent. Any notice which is mailed in the manner
herein provided shall be deemed given, whether or not the holder receives the
notice. Each such notice of exchange will state the method by which the exchange
of the Common Shares for Rights will be effected and, in the event of any
partial exchange, the number of Rights which will be exchanged. Any partial
exchange shall be effected pro rata based on the number of Rights (other than
Rights which have become void pursuant to the provisions of Section 7(e) hereof)
held by each holder of Rights.

                     (c) In the event that there shall not be sufficient Common
Shares issued but not outstanding or authorized but unissued to permit any
exchange of Rights as contemplated in accor dance with Section 24(a), the
Company shall either take such action as may be necessary to authorize
additional Common Shares for issuance upon exchange of the Rights or
alternatively, at the option of a majority of the Board of Directors, with
respect to each Right (i) pay cash in an amount equal to the Current Value (as
hereinafter defined), in lieu of issuing Common Shares in exchange therefor, or
(ii) issue debt or equity securities or a combination thereof, having a value
equal to the Current Value, in lieu of issuing Common Shares in exchange for
each such Right, where the value of such securities shall be determined by a
nationally recognized investment banking firm selected by majority vote of the
Board of Directors, or (iii) deliver any combination of cash, property, Common
Shares and/or other securities having a value equal to the Current Value in
exchange for each Right. For purposes of this Section 24(c) only, the Current
Value shall mean the product of the Current Per Share Market Price of Common
Shares on the date of the occurrence of the event described above in
subparagraph (a), multiplied by the number of Common Shares for which the Right
otherwise would be exchangeable if there were sufficient shares available. To
the extent that the Company determines that some action need be taken pursuant
to clauses (i), (ii) or (iii) of this Section 24(c), the Board of Directors may
temporarily suspend the exercisability of the Rights for a period of up to sixty
(60) days following the date on which the event described in Section 24(a) shall
have occurred, in order to seek any authorization of additional Common Shares
and/or to decide the appropriate form of distribution to be made pursuant to the
above provision and to determine the value thereof. In the event of any such
suspension, the Company shall issue a public announcement stating that the
exercisability of the Rights has been temporarily suspended.


                                      -33-
<PAGE>   37
                     (d) The Company shall not be required to issue fractions of
Common Shares or to distribute certificates which evidence fractional Common
Shares. In lieu of such fractional Common Shares, there shall be paid to the
registered holders of the Rights 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 a whole Common Share (as
determined pursuant to the second sentence of Section 1(k) hereof).

                     (e) The Company may, at its option, by majority vote of the
Board of Directors, at any time before any Person has become an Acquiring
Person, exchange all or part of the then outstanding Rights for rights of
substantially equivalent value, as determined reasonably and with good faith by
the Board of Directors, based upon the advice of one or more nationally
recognized investment banking firms.

                     (f) Immediately upon the action of the Board of Directors
ordering the exchange of any Rights pursuant to subsection 24(e) of this Section
24 and without any further action and without any notice, the right to exercise
such Rights shall terminate and the only right thereafter of a holder of such
Rights shall be to receive that number of rights in exchange therefor as has
been determined by the Board of Directors in accordance with subsection 24(e)
above. The Company shall 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 shall mail a notice of any
such exchange to all of the holders of such Rights at their last addresses as
they appear upon the registry books of the transfer agent for the Common Shares
of the Company. Any notice which is mailed in the manner herein provided shall
be deemed given, whether or not the holder receives the notice. Each such notice
of exchange will state the method by which the exchange of the Rights will be
effected.

           Section 25.   Notice of Certain Events.

                     (a) In case the Company shall propose to effect or permit
to occur any Triggering Event or Section 13 Event, the Company shall give notice
thereof to each holder of Rights in accordance with Section 26 hereof at least
twenty (20) days prior to occurrence of such Triggering Event or such Section 13
Event.

                     (b) In case any Triggering Event or Section 13 Event shall
occur, then, in any such case, the Company shall as soon as practicable
thereafter give to each holder of a Rights Certificate, in accordance with
Section 26 hereof, a notice of the occurrence of such event, which shall specify
the event and the consequences of the event to holders of Rights under Sections
11(a)(ii) and 13 hereof.



                                      -34-
<PAGE>   38
           Section 26. Notices. Notices or demands authorized by this Agreement
to be given or made by the Rights Agent or by the holder of any Rights
Certificate to or on the Company shall be suffi ciently 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:

                                          Adaptec, Inc.
                                          691 South Milpitas Blvd.
                                          Milpitas, CA  95035
                                          Attention: President

                                          with a copy to:

                                          Wilson Sonsini Goodrich & Rosati
                                          Professional Corporation
                                          650 Page Mill Road
                                          Palo Alto, California 94304-1050
                                          Attention: Henry P. Massey, Jr.

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

                                          ChaseMellon Shareholder Services, LLC
                                          50 California St., 10th Floor
                                          San Francisco, CA  94105
                                          Attention: Corporate Trust Department

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

           Section 27. Supplements and Amendments. Prior to the occurrence of a
Distribution Date, the Company may supplement or amend this Agreement in any
respect without the approval of any holders of Rights and the Rights Agent
shall, if the Company so directs, execute such supplement or amendment. From and
after the occurrence of a Distribution Date, the Company and the Rights Agent
may from time to time supplement or amend this Agreement without the approval of
any holders of Rights in order to (i) cure any ambiguity, (ii) correct or
supplement any provision contained herein which may be defective or inconsistent
with any other provisions herein, (iii) shorten or lengthen any time period
hereunder (which shortening or lengthening shall be effective only if
there are Continuing Directors and shall require the concurrence of a majority
of such Continuing Directors) or (iv) to change or supplement the provisions
hereunder in any manner that the Company may deem necessary or desirable and
that shall not adversely affect the interests of the holders of Rights (other
than an Acquiring Person or an Affiliate 


                                      -35-
<PAGE>   39
or Associate of an Acquiring Person); provided, this Agreement may not be
supplemented or amended to lengthen, pursuant to clause (iii) of this sentence,
(A) a time period relating to when the Rights may be redeemed at such time as
the Rights are not then redeemable or (B) any other time period unless such
lengthening is for the purpose of protecting, enhancing or clarifying the rights
of, and/or the benefits to, the holders of Rights (other than an Acquiring
Person or an Affiliate or Associate of an Acquiring Person). Upon the delivery
of a certificate from an appropriate officer of the Company that states that the
proposed supplement or amendment is in compliance with the terms of this Section
?, the Rights Agent shall execute such supplement or amendment. Prior to the
Distribution Date, the interests of the holders of Rights shall be deemed
coincident with the interests of the holders of Common Shares.

           Section 28. Successors. All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

           Section 29. Determinations and Actions by the Board of Directors,
etc. For all purposes of this Agreement, any calculation of the number of Common
Shares outstanding at any particular time, including for purposes of determining
the particular percentage of such outstanding Common Shares of which any Person
is the Beneficial Owner, shall be made in accordance with the last sentence of
Rule 13d-3(d)(1)(i) of the General Rules and Regulations under the Exchange Act.
The Board of Directors of the Company (or, where specifically provided for
herein, the Continuing Directors) shall have the exclusive power and authority
to administer this Agreement and to exercise all rights and powers specifically
granted to the Board, or the Company (or, where specifically provided for
herein, the Continuing Directors), or as may be necessary or advisable in the
administra tion of this Agreement, including, without limitation, the right and
power to (i) interpret the provisions of this Agreement and (ii) make all
determinations deemed necessary or advisable for the administration of this
Agreement (including a determination to redeem or not redeem the Rights or to
amend the Agreement). All such actions, calculations, interpretations and
determinations (including, for purposes of clause (y) below, all omissions with
respect to the foregoing) which are done or made by the Board (or, where
specifically provided for herein, by the Continuing Directors) in good faith,
shall (x) be final, conclusive and binding on the Company, the Rights Agent, the
holders of the Rights Certificates and all other parties and (y) not subject the
Board or the Continuing Directors to any liability to the holders of the Rights.

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

           Section 31. Severability. If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable, the remainder of the
terms, provisions, covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated;
provided, however, that notwithstanding anything in this Agreement to the
contrary, if any such term, provision, covenant or 


                                      -36-
<PAGE>   40
restriction is held by such court or authority to be invalid, void or
unenforceable and the Board of Directors of the Company determines in its good
faith judgment that severing the invalid language from this Agreement would
adversely affect the purpose or effect of this Agreement, the right of
redemption set forth in Section 23 hereof shall be reinstated and shall not
expire until the Close of Business on the tenth day following the date of such
determination by the Board of Directors.

           Section 32. Governing Law. This Agreement and each Right and each
Rights Certificate issued hereunder shall be deemed to be a contract made under
the laws of the State of California and for all purposes shall be governed by
and construed in accordance with the laws of such State applicable to contracts
to be made and performed entirely within such State.

           Section 33. Counterparts. This Agreement may be executed in any
number of counterparts and each of such counterparts shall for all purposes be
deemed to be an original, and all such counterparts shall together constitute
but one and the same instrument.

           Section 34. Descriptive Headings. Descriptive headings of the several
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.


                                      -37-
<PAGE>   41
           IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed as of the day and year first above written.

"COMPANY"                                  ADAPTEC, INC.

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

"RIGHTS AGENT"                             CHASEMELLON SHAREHOLDER SERVICES, LLC

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


                                      -38-
<PAGE>   42
                                    EXHIBIT A

               CERTIFICATE OF DETERMINATION OF RIGHTS, PREFERENCES
                                AND PRIVILEGES OF
                     SERIES A PARTICIPATING PREFERRED STOCK
                                OF ADAPTEC, INC.

           The undersigned, Paul G. Hansen and Henry P. Massey, Jr. do hereby
certify:

           1. That they are the duly elected and acting Vice President, Finance
and Chief Financial Officer and Secretary, respectively, of Adaptec, Inc., a
California corporation (the "CORPORATION").

           2. That pursuant to the authority conferred upon the Board of
Directors by the Certificate of Incorporation of the said Corporation, the said
Board of Directors on December 5, 1996 adopted the following resolution creating
a series of 250,000 shares of Preferred Stock designated as Series A
Participating Preferred Stock:

           "RESOLVED, that pursuant to the authority vested in the Board of
Directors of the corporation by the Restated Articles of Incorporation, the
Board of Directors does hereby provide for the issue of a series of Preferred
Stock of the Corporation and does hereby fix and herein state and express the
designations, powers, preferences and relative and other special rights and the
qualifications, limitations and restrictions of such series of Preferred Stock
as follows:

           Section 1. Designation and Amount. The shares of such series shall be
designated as "SERIES A PARTICIPATING PREFERRED STOCK." The Series A
Participating Preferred Stock shall have a par value of $0.001 per share, and
the number of shares constituting such series shall be 250,000.

           Section 2. Proportional Adjustment. In the event the Corporation
shall at any time after the issuance of any share or shares of Series A
Participating Preferred Stock (i) declare any dividend on Common Stock of the
Corporation ("COMMON STOCK") payable in shares of Common Stock, (ii) subdivide
the outstanding Common Stock or (iii) combine the outstanding Common Stock into
a smaller number of shares, then in each such case the Corporation shall
simultaneously effect a proportional adjustment to the number of outstanding
shares of Series A Participating Preferred Stock.

           Section 3.    Dividends and Distributions.

                     (a) Subject to the prior and superior right of the holders
of any shares of any series of Preferred Stock ranking prior and superior to the
shares of Series A Participating Preferred Stock with respect to dividends, the
holders of shares of Series A Participating Preferred Stock shall be entitled to
receive when, as and if declared by the Board of Directors out of funds legally
available for the purpose, quarterly dividends payable in cash on the last day
of January, April, July and October in each year (each such date being referred
to herein as a "QUARTERLY DIVIDEND PAYMENT DATE"), commencing on the first
Quarterly Dividend Payment Date after the first issuance of a share or fraction
of a share of Series A Participating Preferred Stock, in an amount per share
(rounded to the nearest cent) equal to 1,000 times 
<PAGE>   43
the aggregate per share amount of all cash dividends, and 1,000 times the
aggregate per share amount (payable in kind) of all non-cash dividends or other
distributions other than a dividend payable in shares of Common Stock or a
subdivision of the outstanding shares of Common Stock (by reclassification or
otherwise), declared on the Common Stock 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 Participating Preferred Stock.

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

                     (c) Dividends shall begin to accrue on outstanding shares
of Series A Participating Preferred Stock from the Quarterly Dividend Payment
Date next preceding the date of issue of such shares of Series A Participating
Preferred Stock, unless the date of issue of such shares is prior to the record
date for the first Quarterly Dividend Payment Date, in which case dividends on
such shares shall begin to accrue from the date of issue of such shares, or
unless the date of issue is a Quarterly Dividend Payment Date or is a date after
the record date for the determination of holders of shares of Series A
Participating Preferred Stock entitled to receive a quarterly dividend and
before such Quarterly Dividend Payment Date, in either of which events such
dividends shall begin to accrue from such Quarterly Dividend Payment Date.
Accrued but unpaid dividends shall not bear interest. Dividends paid on the
shares of Series A Participating 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. The Board of Directors may fix a record date for the
determination of holders of shares of Series A Participating Preferred Stock
entitled to receive payment of a dividend or distribution declared thereon,
which record date shall be no more than 30 days prior to the date fixed for the
payment thereof.

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

                     (a) Each share of Series A Participating Preferred Stock
shall entitle the holder thereof to 1,000 votes on all matters submitted to a
vote of the shareholders of the Corporation.

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

                     (c) Except as required by law, holders of Series A
Participating Preferred Stock shall have no special voting rights and their
consent shall not be required (except to the extent they are entitled to vote
with holders of Common Stock as set forth herein) for taking any corporate
action.



                                      -2-
<PAGE>   44
           Section 5.    Certain Restrictions.

                     (a) The Corporation shall not declare any dividend on, make
any distribution on, or redeem or purchase or otherwise acquire for
consideration any shares of Common Stock after the first issuance of a share or
fraction of a share of Series A Participating Preferred Stock unless
concurrently therewith it shall declare a dividend on the Series A Participating
Preferred Stock as required by Section 3 hereof.

                     (b) Whenever quarterly dividends or other dividends or
distributions payable on the Series A Participating Preferred Stock as provided
in Section 3 are in arrears, thereafter and until all accrued and unpaid
dividends and distributions, whether or not declared, on shares of Series A
Participating 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 Participating Preferred Stock;

                           (ii) declare or pay dividends on, 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 Series A Participating
Preferred Stock, except dividends paid ratably on the Series A Participating
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 Participating
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 Participating Preferred
Stock;

                           (iv) purchase or otherwise acquire for consideration
any shares of Series A Participating Preferred Stock, or any shares of stock
ranking on a parity with the Series A Participating 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.

                     (c) 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 5, purchase or otherwise acquire such shares at such time and in
such manner.


                                      -3-
<PAGE>   45
           Section 6. Reacquired Shares. Any shares of Series A Participating
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 and may be reissued as part of a new series of
Preferred Stock to be created by resolution or resolutions of the Board of
Directors, subject to the conditions and restrictions on issuance set forth
herein and, in the Restated Articles of Incorporation, as then amended.

           Section 7. Liquidation, Dissolution or Winding Up. Upon any
liquidation, dissolution or winding up of the Corporation, the holders of shares
of Series A Participating Preferred Stock shall be entitled to receive an
aggregate amount per share equal to 1,000 times the aggregate amount to be
distributed per share to holders of shares of Common Stock plus an amount equal
to any accrued and unpaid dividends on such shares of Series A Participating
Preferred Stock.

           Section 8. Consolidation, Merger, etc. In case the Corporation shall
enter into any consolidation, merger, combination or other transaction in which
the shares of Common Stock are exchanged for or changed into other stock or
securities, cash and/or any other property, then in any such case the shares of
Series A Participating Preferred Stock shall at the same time be similarly
exchanged or changed in an amount per share equal to 1,000 times the aggregate
amount of stock, securities, cash and/or any other property (payable in kind),
as the case may be, into which or for which each share of Common Stock is
changed or exchanged.

           Section 9. No Redemption. The shares of Series A Participating
Preferred Stock shall not be redeemable.

           Section 10. Ranking. The Series A Participating Preferred Stock shall
rank junior to all other series of the Corporation's Preferred Stock as to the
payment of dividends and the distribution of assets, unless the terms of any
such series shall provide otherwise.

           Section 11. Amendment. The Restated Articles of Incorporation of the
Corporation shall not be further amended in any manner which would materially
alter or change the powers, preference or special rights of the Series A
Participating Preferred Stock so as to affect them adversely without the
affirmative vote of the holders of a majority of the outstanding shares of
Series A Participating Preferred Stock, voting separately as a class.

           Section 12. Fractional Shares. Series A Participating Preferred Stock
may be issued in fractions of a share which shall entitle the holder, in
proportion to such holder's fractional shares, to exercise voting rights,
receive dividends, participate in distributions and to have the benefit of all
other rights of holders of Series A Participating Preferred Stock.



                                      -4-
<PAGE>   46
           RESOLVED FURTHER, that the President or any Vice President and the
Secretary or any Assistant Secretary of this corporation be, and they hereby
are, authorized and directed to prepare and file a Certificate of Determination
of Rights, Preferences and Privileges in accordance with the foregoing
resolution and the provisions of California law and to take such actions as they
may deem necessary or appropriate to carry out the intent of the foregoing
resolution."

           3. That the authorized number of shares of Preferred Stock of the
Corporation is 1,000,000 and that no such Preferred Stock has been issued.

           We further declare under penalty of perjury that the matters set
forth in the foregoing Certificate of Determination are true and correct of our
own knowledge.

           Executed at Palo Alto, California on December 18, 1996.


                               -------------------------------------------------
                               Paul G. Hansen, Vice President, Finance and Chief
                               Financial Officer



                               -------------------------------------------------
                               Henry P. Massey, Jr., Secretary





                                      -5-
<PAGE>   47
                                    EXHIBIT B

                           FORM OF RIGHTS CERTIFICATE

Certificate No. R-                                             _________ Rights


                     NOT EXERCISABLE AFTER DECEMBER 5, 2006 OR EARLIER IF
                     TERMINATED BY THE COMPANY. THE RIGHTS ARE SUBJECT TO
                     REDEMPTION, AT THE OPTION OF THE COMPANY, AT $.005 PER
                     RIGHT ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT. UNDER
                     CERTAIN CIRCUMSTANCES, RIGHTS BENEFICIALLY OWNED BY AN
                     ACQUIRING PERSON OR AN AFFILIATE OR ASSOCIATE OF AN
                     ACQUIRING PERSON (AS SUCH TERMS ARE DEFINED IN THE RIGHTS
                     AGREEMENT) AND ANY SUBSEQUENT HOLDER OF SUCH RIGHTS MAY
                     BECOME NULL AND VOID. [THE RIGHTS REPRESENTED BY THIS
                     RIGHTS CERTIFICATE ARE OR WERE BENEFICIALLY OWNED BY A
                     PERSON WHO WAS OR BECAME AN ACQUIRING PERSON OR AN
                     AFFILIATE OR ASSOCIATE OF AN ACQUIRING PERSON (AS SUCH
                     TERMS ARE DEFINED IN THE RIGHTS AGREEMENT). ACCORDINGLY,
                     THIS RIGHTS CERTIFICATE AND THE RIGHTS REPRESENTED HEREBY
                     MAY BECOME NULL AND VOID IN THE CIRCUMSTANCES SPECIFIED IN
                     SECTION 7(e) OF SUCH AGREEMENT.]*

                               Rights Certificate

                                  ADAPTEC, INC.

           This certifies that ______________________, or registered assigns, is
the registered owner of the number of Rights set forth above, each of which
entitles the owner thereof, subject to the terms, provisions and conditions of
the Second Amended and Restated Rights Agreement dated as of December 5, 1996
(the "RIGHTS AGREEMENT"), between Adaptec, Inc., a California corporation (the
"Company"), and ChaseMellon Shareholder Services, LLC (the "RIGHTS AGENT"), to
purchase from the Company at any time after the Distribution Date (as such term
is defined in the Rights Agreement) and prior to 5:00 P.M., San Francisco time,
on December 5, 2006 at the office of the Rights Agent designated for such
purpose, or at the office of its successor as Rights Agent, one one-thousandth
of a fully paid non-assessable share of Series A Participating Preferred Stock,
$.001 par value, (the "PREFERRED SHARES"), of the Company, at a purchase price
of $180.00 per one-thousandths of a Preferred Share (the 

- ------------------------
 
*            The portion of the legend in bracket shall be inserted only if
             applicable and shall replace the preceding sentence.
<PAGE>   48
"EXERCISE PRICE"), upon presentation and surrender of this Rights Certificate
with the Form of Election to Purchase and related Certificate duly executed. The
number of Rights evidenced by this Rights Certificate (and the number of
one-thousandths of a Preferred Share which may be purchased upon exercise
hereof) set forth above are the number and Exercise Price as of __________,
1996, based on the Preferred Shares as constituted at such date. As provided in
the Rights Agreement, the Exercise Price and the number and kind of Preferred
Shares or other securities which may be purchased upon the exercise of the
Rights evidenced by this Rights Certificate are subject to modification and
adjustment upon the happening of certain events.

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

                     Subject to the provisions of the Rights Agreement, the
Rights evidenced by this Rights Certificate (i) may be redeemed by the Company,
at its option, at a redemption price of $0.01 per Right or (ii) may be exchanged
by the Company in whole or in part for Common Shares, substantially equivalent
rights or other consideration as determined by the Company.

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

                     No fractional portion of less than one one-thousandth of a
Preferred Share will be issued upon the exercise of any Right or Rights
evidenced hereby but in lieu thereof a cash payment will be made, as provided in
the Rights Agreement.

                     No holder of this Rights Certificate, as such, shall be
entitled to vote or receive dividends or be deemed for any purpose the holder of
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 shareholder of the Company or any right to vote for
the election of directors or upon any matter submitted to shareholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting shareholders (except as
provided in the Rights Agreement), or to receive dividends or subscription
rights, or otherwise, until the Right or Rights evidenced by this Rights
Certificate shall have been exercised as provided in the Rights Agreement.



                                      -2-
<PAGE>   49
                     This Rights Certificate shall not be valid or obligatory
for any purpose until it shall have been countersigned by the Rights Agent.

                     WITNESS the facsimile signature of the proper officers of
the Company and its corporate seal. Dated as of ___________, 19___.


ATTEST:                                         ADAPTEC, INC.

                                                By
- -------------------------------------                ---------------------------
Secretary                                             President

Countersigned:

CHASEMELLON SHAREHOLDER SERVICES, LLC
as Rights Agent

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

   
                                       -3-
<PAGE>   50
                   FORM OF REVERSE SIDE OF RIGHTS CERTIFICATE

                               FORM OF ASSIGNMENT

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

                     FOR VALUE RECEIVED _______________________hereby sells,
assigns and transfers unto__________________________________________________
                  (Please print name and address of transferee)

________________________________________________________________________________

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

Dated: _______________, 19____

                                                       _________________________
                                                       Signature

Signature Guaranteed:

           Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers, Inc., or a commercial bank or trust company having an office or
correspondent in the United States.
<PAGE>   51
                                   CERTIFICATE

           The undersigned hereby certifies by checking the appropriate boxes
that:

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

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

Dated: _______________, 19____

                                                       _________________________
                                                       Signature



Signature Guaranteed:

           Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers, Inc., or a commercial bank or trust company having an office or
correspondent in the United States.
<PAGE>   52
             FORM OF REVERSE SIDE OF RIGHTS CERTIFICATE -- CONTINUED

                          FORM OF ELECTION TO PURCHASE

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

To:        ADAPTEC, INC.

                     The undersigned hereby irrevocably elects to exercise
_________________________ Rights represented by this Rights Certificate to
purchase the number of one-thousandths of a Preferred Share issuable upon the
exercise of such Rights and requests that certificates for such number of one-
thousandths of a Preferred Share 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 Rights
Certificate, a new Rights 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: ___________________ , 19____

                                                       _________________________
                                                       Signature

Signature Guaranteed:

           Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers, Inc., or a commercial bank or trust company having an office or
correspondent in the United States.
<PAGE>   53
                                   CERTIFICATE

           The undersigned hereby certifies by checking the appropriate boxes
that:

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

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


Dated: _______________, 19____


                                                    Signature

Signature Guaranteed:

           Signatures must be guaranteed by a member firm of a registered
national securities exchange, a member of the National Association of Securities
Dealers, Inc., or a commercial bank or trust company having an office or
correspondent in the United States.
<PAGE>   54
             FORM OF REVERSE SIDE OF RIGHTS CERTIFICATE -- CONTINUED

                                     NOTICE

                     The signature in the foregoing Forms of Assignment and
Election must conform to the name as written upon the face of this Rights
Certificate in every particular, without alteration or enlargement or any change
whatsoever.
<PAGE>   55
                                    EXHIBIT C

                                  ADAPTEC, INC.
                  AMENDED AND RESTATED SHAREHOLDER RIGHTS PLAN

                                Summary of Rights

                    
Distribution and                        On April 25, 1989, the Board of
Transfer of Rights;                     Directors declared a dividend of one
Rights Certificate:                     Right for each share of Adaptec, Inc.
                                        Common Stock outstanding at the close of
                                        business on May 9, 1989. Prior to the
                                        Distribution Date referred to below, the
                                        Rights will be evidenced by and trade
                                        with the certificates for the Common
                                        Stock. After the Distribution Date,
                                        Adaptec, Inc. (the "COMPANY") will mail
                                        Rights certificates to the Company's
                                        shareholders and the Rights will become
                                        transferable apart from the Common
                                        Stock.

Distribution Date:                      Rights will separate from the Common
                                        Stock and become exercisable following
                                        (a) the tenth day (or such later date as
                                        may be determined by a majority of the
                                        Directors not affiliated with the
                                        acquiring person or group (the
                                        "CONTINUING DIRECTORS")) after a person
                                        or group acquires beneficial ownership
                                        of 20% or more of the Company's Common
                                        Stock or (b) the tenth business day (or
                                        such later date as may be determined by
                                        a majority of the Continuing Directors)
                                        after announces a tender or exchange
                                        offer, the consummation of which would
                                        result in ownership by a person or group
                                        of 20% or more of the Company's Common
                                        Stock.


Preferred Stock                         After the Distribution Date, each Right
Purchasable Upon                        will entitle the holder to purchase, for
Exercise of Rights:                     $180.00, (the "EXERCISE PRICE") a
                                        fraction of a share of the Company's
                                        Preferred Stock with economic terms
                                        similar to those of one share of the
                                        Company's Common Stock.
                                     

Flip-In:                                If an acquiror (an "ACQUIRING PERSON")
                                        obtains 20% or more of the Company's
                                        Common Stock (other than pursuant to a
                                        tender offer deemed adequate and in the
                                        best interests of the Company and its
                                        shareholders by the Continuing Directors
                                        (a "PERMITTED OFFER")), then each Right
                                        (other than Rights owned by an Acquiring
                                        Person or its affiliates) will entitle
                                        the holder thereof to purchase, for the
                                        Exercise Price, a number of shares of
                                        the Company's Common Stock having a then
                                        current market value of twice the
                                        Exercise Price.



                                     
<PAGE>   56
Flip-Over:                              If, after an Acquiring Person obtains
                                        20% or more of the Company's Common
                                        Stock, (a) the Company merges into
                                        another entity, (b) an acquiring entity
                                        merges into the Company or (c) the
                                        Company sells more than 50% of the
                                        Company's assets or earning power, then
                                        each Right (other than Rights owned by
                                        an Acquiring Person or its affiliates)
                                        will entitle the holder thereof to
                                        purchase, for the Exercise Price, a
                                        number of shares of Common Stock of the
                                        person engaging in the transaction
                                        having a then current market value of
                                        twice the Exercise Price (unless the
                                        transaction satisfies certain conditions
                                        and is consummated with a person who
                                        acquired shares pursuant to a Permitted
                                        Offer, in which case the Rights will
                                        expire).

Exchange Provision:                     At any time after the date an Acquiring
                                        Person obtains 20% or more of the
                                        Company's Common Stock and prior to the
                                        acquisition by the Acquiring Person of
                                        50% of the outstanding Common Stock, a
                                        majority of the Board of Directors and a
                                        majority of the Continuing Directors of
                                        the Company may exchange the Rights
                                        (other than Rights owned by the
                                        Acquiring Person or its affiliates), in
                                        whole or in part, for shares of the
                                        Company's Common Stock at an exchange
                                        ratio of one share of Common Stock per
                                        Right (subject to adjustment).

Redemption of                           Rights will be redeemable at the
the Rights:                             Company's option for $.01 per Right at
                                        any time on or prior to the tenth day
                                        (or such later date as may be determined
                                        by a majority of the Continuing
                                        Directors) after public announcement
                                        that a person has acquired beneficial
                                        ownership of 20% or more of the
                                        Company's Common Stock (the "SHARES
                                        ACQUISITION DATE").

Expiration of                           The Rights expire on the earliest of (a)
the Rights:                             December 5, 2006 (b) exchange or
                                        redemption of the Rights as described
                                        above or (c) consummation of a merger,
                                        consolidation or sale of assets
                                        resulting in expiration of the Rights as
                                        described above.

Amendment of                            The terms of the Rights and the Rights
Terms of Rights:                        Agreement may be amended in any respect
                                        without the consent of the Rights
                                        holders on or prior to the Distribution
                                        Date. Thereafter, the terms of the
                                        Rights and the Rights Agreement may be
                                        amended without the consent of the
                                        Rights holders in order to cure any
                                        ambiguities or to make changes which do
                                        not adversely affect the interests of
                                        Rights holders (other than the Acquiring
                                        Person).

Voting Rights:                          Rights will not have any voting rights.



                                      -2-
<PAGE>   57
Anti-Dilution                           Provisions Rights will have the benefit
                                        of certain customary anti-dilution
                                        provisions.

Taxes:                                  Neither the initial distribution of the
                                        Rights nor the amendment of certain
                                        terms of the Rights in December 1996
                                        should be taxable for federal income tax
                                        purposes. However, following an event
                                        which renders the Rights exercisable or
                                        upon redemption of the Rights,
                                        shareholders may recognize taxable
                                        income.

The foregoing is a summary of certain principal terms of the Shareholder Rights
Plan only and is qualified in its entirety by reference to the detailed terms of
the Second Amended and Restated Rights Agreement dated as of December 5, 1996,
between the Company and ChaseMellon Shareholder Services, LLC of California, as
the Rights Agent.

                                      -3-


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