ARADIGM CORP
8-K, 1998-09-02
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D. C. 20549

                                    FORM 8-K


                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


      Date of Report (Date of earliest event reported): September 2, 1998



                               ARADIGM CORPORATION
             (Exact name of registrant as specified in its charter)


                                   CALIFORNIA
                 (State or other jurisdiction of incorporation)



        0-28402                                         94-3133088
(Commission File No.)                        (IRS Employer Identification No.)



                             26219 EDEN LANDING ROAD
                            HAYWARD, CALIFORNIA 94545
              (Address of principal executive offices and zip code)



       Registrant's telephone number, including area code: (510) 783-0100
<PAGE>   2
Item 5. Other Events.

               On August 4, 1998 the Board of Directors of Aradigm Corporation
(the "Company") approved the adoption of a Share Purchase Rights Plan (the
"Plan"). Terms of the Plan provide for a dividend distribution of one preferred
share purchase right (a "Right") for each outstanding share of common stock,
without par value per share (the "Common Shares"), of the Company. The dividend
is payable on September 8, 1998 (the "Record Date") to the shareholders of
record on that date. Each Right entitles the registered holder to purchase from
the Company one one-hundredth of a share of Series A Junior Participating
Preferred Stock, without par value per share (the "Preferred Shares"), at a
price of $65 per one one-hundredth of a Preferred Share (the "Purchase Price"),
subject to adjustment. Each one one-hundredth of a share of Preferred Shares has
designations and powers, preferences and rights, and the qualifications,
limitations and restrictions which make its value approximately equal to the
value of a Common Share. The description and terms of the Rights are set forth
in a Rights Agreement (the "Rights Agreement"), dated as of August 31, 1998
entered into between the Company and BankBoston, N.A., as rights agent (the
"Rights Agent").

               Initially, the Rights will be evidenced by the stock certificates
representing the Common Shares then outstanding, and no separate Right
Certificates (as defined in the Rights Agreement) will be distributed. Until the
earlier to occur of (i) the date of a public announcement that a person, entity
or group of affiliated or associated persons have acquired beneficial ownership
of 15% or more of the outstanding Common Shares (an "Acquiring Person") or (ii)
10 business days (or such later date as may be determined by action of the Board
of Directors prior to such time as any person or entity becomes an Acquiring
Person) following the commencement of, or announcement of an intention to
commence, a tender offer or exchange offer the consummation of which would
result in any person or entity becoming an Acquiring Person (the earlier of such
dates being called the "Distribution Date"), the Rights will be evidenced, with
respect to any of the Common Share certificates outstanding as of the Record
Date, by such Common Share certificate with or without a copy of the Summary of
Rights, which is included in the Rights Agreement as Exhibit C thereof (the
"Summary of Rights").

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

                                       1
<PAGE>   3
               The Rights are not exercisable until the Distribution Date. The
Rights will expire on September 8, 2008 (the "Final Expiration Date"), unless
the Rights are earlier redeemed or exchanged by the Company, in each case, as
described below.

               The Purchase Price payable, and the number of Preferred Shares or
other securities or other property, upon exercise of the Rights are subject to
adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or warrants to subscribe for or purchase Preferred Shares at a price, or
securities convertible into Preferred Shares with a conversion price, less than
the then current market price of the Preferred Shares or (iii) upon the
distribution to holders of the Preferred Shares of evidences of indebtedness or
assets (excluding regular periodic cash dividends paid out of earnings or
retained earnings or dividends payable in Preferred Shares) or of subscription
rights or warrants (other than those referred to above). The exercise of Rights
for Preferred Shares is at all times subject to the availability of a sufficient
number of authorized but unissued Preferred Shares.

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

               Preferred Shares purchasable upon exercise of the Rights will not
be redeemable. Each Preferred Share will be entitled to a minimum preferential
quarterly dividend payment of $1.00 but will be entitled to an aggregate
dividend of 100 times the dividend declared per Common Share. In the event of
liquidation, the holders of the Preferred Shares would be entitled to a minimum
preferential liquidation payment of $100 per share, but would be entitled to
receive an aggregate payment equal to 100 times the payment made per Common
Share. Each Preferred Share will have 100 votes, voting together with the Common
Shares. Finally, in the event of any merger, consolidation or other transaction
in which Common Shares are exchanged, each Preferred Share will be entitled to
receive 100 times the amount of consideration received per Common Share. These
rights are protected by customary anti-dilution provisions. Because of the
nature of the Preferred Shares' dividend and liquidation rights, the value of
one one-hundredth of a Preferred Share should approximate the value of one
Common Share. The Preferred Shares would rank junior to any other series of the
Company's preferred stock.

               In the event that any person or group of affiliated or associated
persons becomes an Acquiring Person, proper provision shall be made so that each
holder of a Right, other than Rights beneficially owned by the Acquiring Person
and its associates and affiliates (which will thereafter be void), will for a
60-day period have the right to receive upon exercise that number of Common
Shares having a market value of two times the exercise price of the Right (or,
if such number of shares is not and cannot be authorized, the Company may issue
Preferred Shares, cash, debt, stock or a combination thereof in exchange for the
Rights). This right will terminate 60 days after the date on which the Rights
become nonredeemable (as described below), unless 

                                       2
<PAGE>   4

there is an injunction or similar obstacle to exercise of the Rights, in which
event this right will terminate 60 days after the date on which the Rights again
become exercisable.

               Generally, under the Plan, an "Acquiring Person" shall not be
deemed to include (i) the Company, (ii) a subsidiary of the Company, (iii) any
employee benefit or compensation plan of the Company, or (iv) any entity holding
Common Shares for or pursuant to the terms of any such employee benefit or
compensation plan. In addition, except under limited circumstances, no person or
entity shall become an Acquiring Person as the result of the 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 or entity to 15% or more of the Common Shares then outstanding.
Further, except under certain circumstances, no person shall become an Acquiring
Person due to the acquisition of Common Shares directly from the Company.

               In the event that the Company is acquired in a merger or other
business combination transaction or 50% or more of its consolidated assets or
earning power are sold to an Acquiring Person, its associates or affiliates or
certain other persons in which such persons have an interest, proper provision
will be made so that each holder of a Right will thereafter have the right to
receive, upon the exercise thereof at the then current exercise price of the
Right, that number of shares of common stock of the acquiring company which at
the time of such transaction will have a market value of two times the exercise
price of the Right.

               At any time after an Acquiring Person becomes an Acquiring Person
and prior to the acquisition by such Acquiring Person of 50% or more of the
outstanding Common Shares, the Board of Directors of the Company may exchange
the Rights (other than Rights owned by such person or group which have become
void), in whole or in part, at an exchange ratio of one Common Share, or one
one-hundredth of a Preferred Share, per Right (or, at the election of the
Company, the Company may issue cash, debt, stock or a combination thereof in
exchange for the Rights), subject to adjustment.

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

               At any time prior to the earliest of (i) the day of the first
public announcement that a person has become an Acquiring Person or (ii) the
Final Expiration Date, the Board of Directors of the Company may redeem the
Rights in whole, but not in part, at a price of $.001 per Right (the "Redemption
Price"). Following the expiration of the above periods, the Rights become
nonredeemable. Immediately upon any redemption of the Rights, the right to
exercise the Rights will terminate and the only right of the holders of Rights
will be to receive the Redemption Price.

                                       3
<PAGE>   5

               The terms of the Rights may be amended by the Board of Directors
of the Company without the consent of the holders of the Rights, except that
from and after such time as the rights are distributed no such amendment may
adversely affect the interest of the holders of the Rights excluding the
interests of an Acquiring Person.

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

               The Rights have certain anti-takeover effects. The Rights will
cause substantial dilution to a person or group that attempts to acquire the
Company on terms not approved by the Company's Board of Directors. The Rights
should not interfere with any merger or other business combination approved by
the Board of Directors since the Rights may be amended to permit such
acquisition or redeemed by the Company at $.001 per Right prior to the earliest
of (i) the time that a person or group has acquired beneficial ownership of 15%
or more of the Common Shares or (ii) the final expiration date of the rights.


Item 7. Exhibits.

               99.1 Press Release, dated as of September 2, 1998.

               99.2 Rights Agreement dated as of August 31, 1998 among Aradigm
               Corporation and BankBoston, N.A..


                                       4
<PAGE>   6
                                    SIGNATURE

               Pursuant to the requirements of the Securities Exchange Act of
1934, the registrant has duly caused this report to be signed on its behalf by
the undersigned, thereunto duly authorized.


                                            ARADIGM CORPORATION


Dated:  August 31, 1998                     By:    /s/ Mark A. Olbert
                                                ---------------------
                                                   Mark A. Olbert

                                            Title: Vice President, Finance and
                                                   Administration and Chief
                                                   Financial Officer

                                       5
<PAGE>   7

                                INDEX TO EXHIBITS



               99.1 Press Release, dated as of September 2, 1998.

               99.2 Rights Agreement dated as of August 31, 1998 among Aradigm
               Corporation and BankBoston, N.A.


                                       6

<PAGE>   1
                                                                    EXHIBIT 99.1

                              [Company Letterhead]

                                  PRESS RELEASE



ARADIGM CORPORATION ADOPTS SHAREHOLDER RIGHTS PLAN

Hayward, California, September 1, 1998 - Aradigm Corporation (Nasdaq: ARDM)
announced that its board of directors approved the adoption of a shareholder
rights plan under which all shareholders of record as of September 8, 1998 will
receive rights to purchase one one-hundredth of a share of a new issue of
Aradigm preferred stock.

        The rights plan is designed to enable all Aradigm shareholders to
realize the full value of their investment and to provide for fair and equal
treatment for all shareholders in the event that an unsolicited attempt is made
to acquire Aradigm. The adoption of the rights plan is intended as a means to
guard against abusive takeover tactics and is not in response to any particular
proposal.

        The rights will be distributed as a non-taxable dividend and will expire
ten years from the record date, September 8, 1998. The rights will be
exercisable only if a person or group acquires 15 percent or more of Aradigm
common stock or announces a tender offer for 15 percent or more of the common
stock. If a person acquires 15 percent or more of Aradigm's common stock, all
rightsholders except the buyer will be entitled to acquire Aradigm common stock
at a discount. The effect will be to discourage acquisitions of more than
15 percent of Aradigm's common stock without negotiations with Aradigm's board
of directors.

        The rights will trade with Aradigm's common stock, unless and until they
are separated upon the occurrence of certain future events. The rights
distribution is not taxable to the shareholders. Aradigm's board of directors
may terminate the rights plan at any time or redeem the rights prior to the time
a person acquires more than 15 percent of the Aradigm common stock. Additional
details regarding the rights plan will be outlined in a summary to be mailed to
all shareholders of record.

        Located in Hayward, California, Aradigm is engaged in the development
of novel pulmonary drug delivery systems designed to enhance the delivery and
effectiveness of a number of existing and development stage drugs and reduce
the need for injectable drug therapy. Aradigm's principal product development
programs are based on its AERx Pulmonary Drug Delivery System, which uses
proprietary technologies to create aerosols from liquid drug formulations for
delivery locally to the lung or systematically via the lung. In addition, the
company is commercializing the SmartMist(R) Respiratory Management System, which
is designed to improve the delivery technique and compliance of patients using
metered-dose inhalers.

  


<PAGE>   1
                                                                    EXHIBIT 99.2


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

                               ARADIGM CORPORATION

                                       AND

                                BANKBOSTON, N.A.
                                 AS RIGHTS AGENT

                                RIGHTS AGREEMENT

                           DATED AS OF AUGUST 31, 1998

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


















<PAGE>   2

                                TABLE OF CONTENTS
<TABLE>
<CAPTION>

                                                                                          PAGE
<S>          <C>                                                                          <C>
SECTION 1.   CERTAIN DEFINITIONS.............................................................1

SECTION 2.   APPOINTMENT OF RIGHTS AGENT.....................................................4

SECTION 3.   ISSUE OF RIGHT CERTIFICATES.....................................................4

SECTION 4.   FORM OF RIGHT CERTIFICATES......................................................6

SECTION 5.   COUNTERSIGNATURE AND REGISTRATION...............................................7

SECTION 6.   TRANSFER, SPLIT UP, COMBINATION AND EXCHANGE OF RIGHT CERTIFICATES; MUTILATED, 
             DESTROYED, LOST OR STOLEN RIGHT CERTIFICATES....................................8

SECTION 7.   EXERCISE OF RIGHTS; PURCHASE PRICE; EXPIRATION DATE OF RIGHTS...................8

SECTION 8.   CANCELLATION AND DESTRUCTION OF RIGHT CERTIFICATES.............................10

SECTION 9.   AVAILABILITY OF PREFERRED SHARES...............................................10

SECTION 10.  PREFERRED SHARES RECORD DATE...................................................11

SECTION 11.  ADJUSTMENT OF PURCHASE PRICE, NUMBER OF SHARES OR NUMBER OF RIGHTS.............12

SECTION 12.  CERTIFICATE OF ADJUSTED PURCHASE PRICE OR NUMBER OF SHARES.....................20

SECTION 13.  CONSOLIDATION, MERGER OR SALE OR TRANSFER OF ASSETS OR EARNING POWER...........20

SECTION 14.  FRACTIONAL RIGHTS AND FRACTIONAL SHARES........................................24

SECTION 15.  RIGHTS OF ACTION...............................................................25

SECTION 16.  AGREEMENT OF RIGHT HOLDERS.....................................................26

SECTION 17.  RIGHT CERTIFICATE HOLDER NOT DEEMED A SHAREHOLDER..............................26

SECTION 18.  CONCERNING THE RIGHTS AGENT....................................................26

SECTION 19.  MERGER OR CONSOLIDATION OR CHANGE OF NAME OF RIGHTS AGENT......................27

SECTION 20.  DUTIES OF RIGHTS AGENT.........................................................27

SECTION 21.  CHANGE OF RIGHTS AGENT.........................................................30

SECTION 22.  ISSUANCE OF NEW RIGHT CERTIFICATES.............................................30

SECTION 23.  REDEMPTION.....................................................................31

SECTION 24.  EXCHANGE.......................................................................33

SECTION 25.  NOTICE OF CERTAIN EVENTS.......................................................35

SECTION 26.  NOTICES........................................................................36

SECTION 27.  SUPPLEMENTS AND AMENDMENTS.....................................................36

SECTION 28.  DETERMINATION AND ACTIONS BY THE BOARD OF DIRECTORS, ETC.......................37

SECTION 29.  SUCCESSORS.....................................................................37
</TABLE>



<PAGE>   3

                          TABLE OF CONTENTS (Continued)
<TABLE>
<CAPTION>
                                                                                          PAGE
<S>          <C>                                                                          <C>
SECTION 30.  BENEFITS OF THIS AGREEMENT.....................................................37

SECTION 31.  SEVERABILITY...................................................................37

SECTION 32.  GOVERNING LAW..................................................................37

SECTION 33.  COUNTERPARTS...................................................................38

SECTION 34.  DESCRIPTIVE HEADINGS...........................................................38


SECTION 35.

Exhibit A --  Certificate of Determination

Exhibit B --  Form of Right Certificate

Exhibit C --  Summary of Rights to Purchase Preferred Shares
</TABLE>









<PAGE>   4

                                RIGHTS AGREEMENT


     THIS RIGHTS AGREEMENT ("AGREEMENT"), dated as of August 31, 1998, between
ARADIGM CORPORATION, a California corporation (the "Company"), and BankBoston,
N.A. ("Rights Agent").

     The Board of Directors of the Company has authorized and declared a
dividend of one preferred share purchase right (a "Right") for each Common Share
(as such term is hereinafter defined) outstanding at the close of business on
September 8, 1998 (the "Record Date"), each Right representing the right to
purchase one one-hundredth of a Preferred Share (as such term is hereinafter
defined), upon the terms and subject to the conditions herein set forth, and has
further authorized and directed the issuance of one Right with respect to each
Common Share that shall become outstanding between the Record Date and the
earliest to occur of the Distribution Date, the Redemption Date and the Final
Expiration Date (as such terms are hereinafter defined); provided, however, that
Rights may be issued with respect to Common Shares that shall become outstanding
after the Distribution Date and prior to the earlier of the Redemption Date and
the Final Expiration Date in accordance with the provisions of Section 22
hereof.

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

SECTION 1. CERTAIN DEFINITIONS. For purposes of this Agreement, the following
     terms have the meanings indicated:

     (a)  "ACQUIRING PERSON" shall mean any Person (as such term is hereinafter
          defined) who or which, together with all Affiliates and Associates (as
          such terms are hereinafter defined) of such Person, shall be the
          Beneficial Owner (as such term is hereinafter defined) of 15% or more
          of the Common Shares then outstanding. Notwithstanding the foregoing,
          (A) the term Acquiring Person shall not include (i) the Company, (ii)
          any Subsidiary (as such term is hereinafter defined) of the Company,
          (iii) any employee benefit or compensation plan of the Company or any
          Subsidiary of the Company, or (iv) any entity holding Common Shares
          for or pursuant to the terms of any such employee benefit or
          compensation plan, and (B) no Person shall become an "Acquiring
          Person" either (x) 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 15% or more of the Common Shares then outstanding;
          provided, however, that if a Person shall become the Beneficial Owner
          of 15% or more of the Common Shares then outstanding by reason of
          share purchases by the Company and shall, following written notice
          from, or public disclosure by the Company of such share purchases by
          the Company, become the Beneficial Owner of any additional Common
          Shares without the prior consent of the Company and shall then
          Beneficially Own more than 15% of the Common Shares then outstanding,
          then such Person shall be deemed to be an "Acquiring Person," or (y)
          if the Board of Directors determines in good faith that a Person who
          would otherwise be an "Acquiring Person," as defined



                                      1
<PAGE>   5

          pursuant to the foregoing provisions of this paragraph (a), has become
          such inadvertently, and such Person divests, as promptly as
          practicable (as determined in good faith by the Board of Directors),
          but in any event within five Business Days, following receipt of
          written notice from the Company of such event, of Beneficial Ownership
          of 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 an "Acquiring Person" for any purposes of this Agreement.

     (b)  "AFFILIATE" and "ASSOCIATE" shall have the respective meanings
          ascribed to such terms in Rule 12b-2 of the General Rules and
          Regulations under the Securities Exchange Act of 1934, as amended (the
          "Exchange Act"), as in effect on the date of this Agreement; provided,
          however, that the limited partners of a limited partnership shall not
          be deemed to be Associates of such limited partnership solely by
          virtue of their limited partnership interests.

     (c)  A Person shall be deemed the "BENEFICIAL OWNER" of and shall be deemed
          to "beneficially own" any securities:

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

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



                                       2
<PAGE>   6

          (iii) which are beneficially owned, directly or indirectly, by any
               other Person with which such Person or any of such Person's
               Affiliates or Associates has any agreement, arrangement or
               understanding (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(c)(ii)(B) hereof) or disposing of any securities of
               the Company.

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

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

     (e)  "CLOSE OF BUSINESS" on any given date shall mean 5:00 p.m., Eastern
          Time, on such date; provided, however, that if such date is not a
          Business Day it shall mean 5:00 p.m., Eastern Time, on the next
          succeeding Business Day.

     (f)  "COMMON SHARES" shall mean the shares of common stock, no par value,
          of the Company; provided, however, that, "Common Shares," when used in
          this Agreement in connection with a specific 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.

     (g)  "DISTRIBUTION DATE" shall have the meaning set forth in Section 3
          hereof.

     (h)  "FINAL EXPIRATION DATE" shall have the meaning set forth in Section 7
          hereof.

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

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



                                       3
<PAGE>   7

     (k)  "PREFERRED SHARES" shall mean shares of Series A Junior Participating
          Preferred Stock, without par value, of the Company having the rights
          and preferences set forth in the form of Certificate of Determination
          attached to this Agreement as Exhibit A.

     (l)  "PURCHASE PRICE" shall have the meaning set forth in Section 7(b)
          hereof.

     (m)  "REDEMPTION DATE" shall have the meaning set forth in Section 7
          hereof.

     (n)  "SHARES ACQUISITION DATE" shall mean the first date of public
          announcement by the Company or an Acquiring Person that an Acquiring
          Person has become such provided, however that, if such Person is
          determined not to have become an Acquiring Person pursuant to clause
          (y) of Subsection 1(a)(B) hereof, then no Shares Acquisition Date
          shall be deemed to have occurred.

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

     (p)  "TRANSACTION" shall mean any merger, consolidation or sale of assets
          described in Section 13(a) hereof or any acquisition of Common Shares
          which would result in a Person becoming an Acquiring Person or a
          Principal Party (as such term is hereinafter defined).

     (q)  "TRANSACTION PERSON" with respect to a Transaction shall mean (i) any
          Person who (x) is or will become an Acquiring Person or a Principal
          Party (as such term is hereinafter defined) if the Transaction were to
          be consummated and (y) directly or indirectly proposed or nominated a
          director of the Company which director is in office at the time of
          consideration of the Transaction, or (ii) an Affiliate or Associate of
          such a Person.

SECTION 2. APPOINTMENT OF RIGHTS AGENT. The Company hereby appoints the Rights
     Agent to act as agent for the Company in accordance with the terms and
     conditions hereof, and the Rights Agent hereby accepts such appointment.
     The Company may from time to time appoint such co-Rights Agents as it may
     deem necessary or desirable, upon ten (10) days' prior written notice to
     the Rights Agent. The Rights Agent shall have no duty to supervise, and in
     no event be liable for, the acts or omissions of any such co-Rights Agent.

SECTION 3. ISSUE OF RIGHT CERTIFICATES.

     (a)  Until the earlier of (i) the Shares Acquisition Date or (ii) the tenth
          Business Day (or such later date as may be determined by action of the
          Board of Directors prior to such time as any Person becomes an
          Acquiring Person) after the date of the commencement (determined in
          accordance with Rule 14d-2 under the Exchange Act) 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
          entity holding 



                                       4
<PAGE>   8

          Common Shares for or pursuant to the terms of any such plan) of, or of
          the first public announcement of the intention of any Person (other
          than the Company, any Subsidiary of the Company, 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)
          to commence, a tender or exchange offer (which intention to commence
          remains in effect for five Business Days after such announcement), the
          consummation of which would result in any Person becoming an Acquiring
          Person (including any such date which is after the date of this
          Agreement and prior to the issuance of the Rights, the earlier of such
          dates being herein referred to as the "Distribution Date"), (x) the
          Rights will be evidenced by the certificates for Common Shares
          registered in the names of the holders thereof (which certificates
          shall also be deemed to be Right Certificates) and not by separate
          Right Certificates, and (y) the Rights (and the right to receive Right
          Certificates therefor) will be transferable only in connection with
          the transfer of Common Shares. 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,
          insured, 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 Right
          Certificate, in substantially the form of Exhibit B hereto (a "Right
          Certificate"), evidencing one Right for each Common Share so held,
          subject to the adjustment provisions of Section 11 of this Rights
          Agreement. As of the Distribution Date, the Rights will be evidenced
          solely by such Right Certificates.

     (b)  On the Record Date, or as soon as practicable thereafter, the Company
          will send (directly or through the Rights Agent or its transfer agent)
          a copy of a Summary of Rights to Purchase Preferred Shares, in
          substantially the form of Exhibit C hereto (the "Summary of Rights"),
          by first-class, postage-prepaid mail, to each record holder of Common
          Shares as of the Close of Business on the Record Date, at the address
          of such holder shown on the records of the Company. 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. Until the
          Distribution Date (or the earlier of the Redemption Date and the Final
          Expiration Date), the surrender for transfer of any certificate for
          Common Shares outstanding on the Record Date shall also constitute the
          transfer of the Rights associated with the Common Shares represented
          thereby.

     (c)  Certificates for Common Shares which become outstanding (including,
          without limitation, reacquired Common Shares referred to in the last
          sentence of this paragraph (c)) after the Record Date but prior to the
          earliest of the Distribution Date, the Redemption Date or the Final
          Expiration Date shall have impressed on, printed on, written on or
          otherwise affixed to them the following legend:




                                       5
<PAGE>   9

          This certificate also evidences and entitles the holder hereof to
          certain rights as set forth in a Rights Agreement between Aradigm
          Corporation (the "Company") and BankBoston, N.A. as Rights Agent (the
          "Rights Agent"), dated as of August 31, 1998, as amended from time to
          time (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 the Company. Under certain
          circumstances, as set forth in the Rights Agreement, such Rights will
          be evidenced by separate certificates and will no longer be evidenced
          by this certificate. The Company will mail to the holder of this
          certificate a copy of the Rights Agreement without charge after
          receipt of a written request therefor. As described in the Rights
          Agreement, Rights issued to any Person who becomes an Acquiring Person
          or an Affiliate or Associate thereof (as defined in the Rights
          Agreement) and certain related persons, whether currently held by or
          on behalf of such Person or by any subsequent holder, shall become
          null and void.

     With respect to such certificates containing the foregoing legend, until
     the Distribution Date, the Rights associated with the Common Shares
     represented by such certificates shall be evidenced by such certificates
     alone, and the surrender for transfer of any such certificate shall also
     constitute the transfer of the Rights associated with the Common Shares
     represented thereby. In the event that the 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.
     Notwithstanding this Section 3(c), the omission of a legend shall not
     affect the enforceability of any part of this Rights Agreement or the
     rights of any holder of the Rights.

SECTION 4. FORM OF RIGHT CERTIFICATES.

     (a)  The Right Certificates (and the form of election to purchase Preferred
          Shares, the form of assignment and the form of certification to be
          printed on the reverse thereof) shall be substantially the same as
          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 on which the Rights may from time to time be listed, or
          to conform to usage. Subject to the provisions of Sections 7, 11 and
          22 hereof, the Right Certificates shall entitle the holders thereof to
          purchase such number of one one-hundredths of a Preferred 



                                       6
<PAGE>   10

          Share as shall be set forth therein at the price per one one-hundredth
          of a Preferred Share set forth therein (the "Purchase Price"), but the
          number of such one one-hundredths of a Preferred Share and the
          Purchase Price shall be subject to adjustment as provided herein.

     (b)  Any Right Certificate issued pursuant to Section 3(a) or Section 22
          hereof that represents Rights which are null and void pursuant to
          Section 11(a)(ii) hereof and any Right Certificate issued pursuant to
          Section 6 or Section 11 hereof upon transfer, exchange, replacement or
          adjustment of any other Right Certificate referred to in this
          sentence, shall contain (to the extent feasible) the following legend:

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

          The provisions of Section 11(a)(ii) hereof shall be operative whether
          or not the foregoing legend is contained on any such Right
          Certificate.

SECTION 5. COUNTERSIGNATURE AND REGISTRATION. The Right Certificates shall be
     executed on behalf of the Company by its Chairman of the Board, its Chief
     Executive Officer, its President, its Vice Chairman of the Board, its Chief
     Financial Officer, or any of its Vice Presidents, either manually or by
     facsimile signature, shall have affixed thereto the Company's seal or a
     facsimile thereof, and shall be attested by the Secretary or an Assistant
     Secretary of the Company, either manually or by facsimile signature. The
     Right Certificates shall be manually countersigned by the Rights Agent and
     shall not be valid for any purpose unless countersigned. In case any
     officer of the Company who shall have signed any of the Right Certificates
     shall cease to be such officer of the Company before countersignature by
     the Rights Agent and issuance and delivery by the Company, such Right
     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 Right Certificates had not ceased to be
     such officer of the Company; and any Right Certificate may be signed on
     behalf of the Company by any person who, at the actual date of the
     execution of such Right Certificate, shall be a proper officer of the
     Company to sign such Right Certificate, although at the date of the
     execution of this Agreement any such person was not such an officer.

     Following the Distribution Date, the Rights Agent will keep or cause to be
     kept, at its office designated for such purpose, books for registration and
     transfer of the Right Certificates issued hereunder. Such books shall show
     the names and addresses of the respective holders of the Right
     Certificates, the number of Rights evidenced on its face by each of the
     Right Certificates and the date of each of the Right Certificates.



                                       7
<PAGE>   11

SECTION 6. TRANSFER, SPLIT UP, COMBINATION AND EXCHANGE OF RIGHT CERTIFICATES;
     MUTILATED, DESTROYED, LOST OR STOLEN RIGHT CERTIFICATES. Subject to the
     provisions of Section 11(a)(ii), Section 14 and Section 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 earlier of the Redemption Date or the Final
     Expiration Date, any Right Certificate or Right Certificates may be
     transferred, split up, combined or exchanged for another Right Certificate
     or Right Certificates, entitling the registered holder to purchase a like
     number of one one-hundredths of a Preferred Share as the Right Certificate
     or Right Certificates surrendered then entitled such holder to purchase.
     Any registered holder desiring to transfer, split up, combine or exchange
     any Right Certificate or Right Certificates shall make such request in
     writing delivered to the Rights Agent, and shall surrender the Right
     Certificate or Right Certificates to be transferred, split up, combined or
     exchanged at the office 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
     Right Certificate until the registered holder shall have completed and
     signed the certificate contained in the form of assignment on the reverse
     side of such Right Certificate and shall have provided such additional
     evidence of the identity of the Beneficial Owner (or former Beneficial
     Owner) or Affiliates or Associates thereof as the Company shall reasonably
     request. Thereupon the Rights Agent shall, subject to Section 11(a)(ii),
     Section 14 and Section 24 hereof, countersign and deliver to the person
     entitled thereto a Right Certificate or Right Certificates, as the case may
     be, as so requested. The Company may require payment of a sum sufficient to
     cover any tax or governmental charge that may be imposed in connection with
     any transfer, split up, combination or exchange of Right Certificates.

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

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

SECTION 7. EXERCISE OF RIGHTS; PURCHASE PRICE; EXPIRATION DATE OF RIGHTS.

     (a)  The registered holder of any Right Certificate may exercise the Rights
          evidenced thereby (except as otherwise provided herein) in whole or in
          part at any time after the Distribution Date upon surrender of the
          Right Certificate, with the form of election to purchase on the
          reverse side thereof duly executed, to the Rights Agent at the office
          of the Rights Agent designated for such purpose, together with payment
          of the Purchase 



                                       8
<PAGE>   12

          Price for each one one-hundredth of a Preferred Share (or such other
          number of shares or other securities) as to which the Rights are
          exercised, at or prior to the earliest of (i) the Close of Business on
          September 8, 2008 (the "Final Expiration Date"), (ii) the time at 
          which the Rights are redeemed as provided in Section 23 hereof (the
          "Redemption Date"), or (iii) the time at which such Rights are
          exchanged as provided in Section 24 hereof.

     (b)  The purchase price (the "Purchase Price") for each one one-hundredth
          of a Preferred Share pursuant to the exercise of a Right shall
          initially be $65 and 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 Right Certificate representing exercisable Rights,
          with the form of election to purchase duly executed, accompanied by
          payment of the Purchase Price for the shares to be purchased and an
          amount equal to any applicable transfer tax required to be paid by the
          holder of such Right Certificate in accordance with Section 9 hereof
          by certified check, cashier's check, bank draft or money order payable
          to the order of the Company, the Rights Agent shall thereupon promptly
          (i) (A) requisition from any transfer agent for the Preferred Shares
          certificates for the number of Preferred Shares to be purchased and
          the Company hereby irrevocably authorizes its transfer agent to comply
          with all such requests, or (B) if the Company, in its sole discretion,
          shall have elected to deposit the Preferred Shares issuable upon
          exercise of the Rights hereunder into a depository, requisition from
          the depositary agent depositary receipts representing such number of
          one on hundredths of a Preferred Share as are to be purchased (in
          which case certificates for the Preferred Shares represented by such
          receipts shall be deposited by the transfer agent with the depositary
          agent) and the 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 Right Certificate,
          registered in such name or names as may be designated by such holder
          and (iv) when appropriate, after receipt, deliver such cash to or upon
          the order of the registered holder of such Right Certificate. In the
          event that the Company is obligated to issue securities of the Company
          other than Preferred Shares (including Common Shares) of the Company
          pursuant to Section 11(a) hereof, the Company will make all
          arrangements necessary so that such other securities are available for
          distribution by the Rights Agent, if and when appropriate.

          In addition, in the case of an exercise of the Rights by a holder
          pursuant to Section 11(a)(ii) hereof, the Rights Agent shall return
          such Right Certificate to the registered holder thereof after
          imprinting, stamping or otherwise indicating thereon that the rights
          represented by such Right 



                                       9
<PAGE>   13

          Certificate no longer include the rights provided by Section 11(a)(ii)
          hereof, and, if fewer than all the Rights represented by such Right
          Certificate were so exercised, the Rights Agent shall indicate on the
          Right Certificate the number of Rights represented thereby which
          continue to include the rights provided by Section 11(a)(ii) hereof.

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

     (e)  The Company covenants and agrees that it will cause to be reserved and
          kept available out of its authorized and unissued Preferred Shares,
          the number of Preferred Shares that will be sufficient to permit the
          exercise in full of all outstanding Rights in accordance with this
          Section 7.

     (f)  Notwithstanding anything in this Agreement to the contrary, neither
          the Rights Agent nor the Company shall be obligated to undertake any
          action with respect to a registered holder upon the occurrence of any
          purported exercise as set forth in this Section 7 unless such
          registered holder shall have (i) completed and signed the
          certification following 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 RIGHT CERTIFICATES. All Right
     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 delivered or surrendered to the Rights Agent, shall
     be canceled by it, and no Right Certificates shall be issued in lieu
     thereof except as expressly permitted by any of the provisions of this
     Agreement. The Company shall deliver to the Rights Agent for cancellation
     and retirement, and the Rights Agent shall so cancel and retire, any other
     Right Certificate purchased or acquired by the Company otherwise than upon
     the exercise thereof. The Rights Agent shall deliver all canceled Right
     Certificates to the Company, or shall, at the written request of the
     Company, destroy such canceled Right Certificates, and in such case shall
     deliver a certificate of destruction thereof to the Company.

SECTION 9. AVAILABILITY OF PREFERRED SHARES. The Company covenants and agrees
     that so long as the Preferred Shares (and, after the time a person becomes
     an Acquiring Person, Common Shares or any other securities) issuable upon
     the exercise of the Rights may be listed on any national securities
     exchange or quotation system, the Company shall use its best efforts to
     cause, from and after such time as the Rights become exercisable, all
     shares reserved for such issuance to be listed on such exchange or
     quotation system upon official notice of issuance upon such exercise.



                                       10
<PAGE>   14

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

     The Company further covenants and agrees that it will pay when due and
     payable any and all federal and state transfer taxes and charges which may
     be payable in respect of the issuance or delivery of the Right Certificates
     or of any Preferred Shares 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 Right Certificates to a person other
     than, or the issuance or delivery of certificates or depositary receipts
     for the Preferred Shares in a name other than that of, the registered
     holder of the Right Certificate evidencing Rights surrendered for exercise
     or to issue or to deliver any certificates or depositary receipts for
     Preferred Shares upon the exercise of any Rights until any such tax shall
     have been paid (any such tax being payable by the holder of such Right
     Certificate at the time of surrender) or until it has been established to
     the Company's reasonable satisfaction that no such tax is due.

     As soon as practicable after the Shares Acquisition Date, the Company shall
     use its best efforts to:

          (i)  prepare and file a registration statement under the Securities
               Act of 1933, as amended (the "Act"), with respect to the Rights
               and the securities purchasable upon exercise of the Rights on an
               appropriate form, will use its best efforts to cause such
               registration statement to become effective as soon as practicable
               after such filing and will use its best efforts to cause such
               registration statement to remain effective (with a prospectus at
               all times meeting the requirements of the Act) until the Final
               Expiration Date; and

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

SECTION 10. PREFERRED SHARES RECORD DATE. Each person in whose name any
     certificate for Preferred Shares or other securities is issued upon the
     exercise of Rights shall for all purposes be deemed to have become the
     holder of record of the Preferred Shares or other securities represented
     thereby on, and such certificate shall be dated, the date upon which the
     Right Certificate evidencing such Rights was duly surrendered with the
     forms of election and certification duly executed and payment of the
     Purchase Price (and any applicable transfer taxes) was made; provided,
     however, that if the date of such surrender and payment is a date upon
     which the Preferred Shares or other securities 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 



                                       11
<PAGE>   15

     on which the Preferred Shares or other securities transfer books of the
     Company are open. Prior to the exercise of the Rights evidenced thereby,
     the holder of a Right Certificate, as such, shall not be entitled to any
     rights of a holder of Preferred Shares for which the Rights shall be
     exercisable, including, without limitation, the right to vote, to receive
     dividends or other distributions or to exercise any preemptive rights, and
     shall not be entitled to receive any notice of any proceedings of the
     Company, except as provided herein.

SECTION 11. ADJUSTMENT OF PURCHASE PRICE, NUMBER OF SHARES OR NUMBER OF RIGHTS.
     The Purchase Price, the number of Preferred Shares covered by each Right
     and the number of Rights outstanding are subject to adjustment from time to
     time as provided in this Section 11.

     (a)  

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

          (ii) Subject to Section 24 hereof and the provisions of the next
               paragraph of this Section 11(a)(ii), in the event any Person
               shall become an Acquiring Person, each holder of a Right shall,
               for a period of 60 days after the later of such time any Person
               becomes an Acquiring Person or the effective date of an
               appropriate 



                                       12
<PAGE>   16

               registration statement under the Act pursuant to Section 9 hereof
               (provided, however that, if at any time prior to the expiration
               or termination of the Rights there shall be a temporary
               restraining order, a preliminary injunction, an injunction, or
               temporary suspension by the Board of Directors, or similar
               obstacle to exercise of the Rights (the "Injunction") which
               prevents exercise of the Rights, a new 60-day period shall
               commence on the date the Injunction is removed), have a right to
               receive, upon exercise thereof at a price equal to the then
               current Purchase Price multiplied by the number of one
               one-hundredths of a Preferred Share for which a Right is then
               exercisable, in accordance with the terms of this Agreement and
               in lieu of Preferred Shares, such number of Common Shares as
               shall equal the result obtained by (A) multiplying the then
               current Purchase Price by the number of one one-hundredths of a
               Preferred Share for which a Right is then exercisable and
               dividing that product by (B) 50% of the then current per share
               market price of the Common Shares (determined pursuant to Section
               11(d) hereof) on the date such Person became an Acquiring Person;
               provided, however, that if the transaction that would otherwise
               give rise to the foregoing adjustment is also subject to the
               provisions of Section 13 hereof, then only the provisions of
               Section 13 hereof shall apply and no adjustment shall be made
               pursuant to this Section 11(a)(ii). In the event that any Person
               shall become an Acquiring Person and the Rights shall then be
               outstanding, the Company shall not take any action which would
               eliminate or diminish the benefits intended to be afforded by the
               Rights.

               Notwithstanding anything in this Agreement to the contrary, from
               and after the time any Person becomes an Acquiring Person, any
               Rights beneficially owned by (i) such Acquiring Person or an
               Associate or Affiliate of such Acquiring Person, (ii) a
               transferee of such Acquiring Person (or of any such Associate or
               Affiliate) who becomes a transferee after the Acquiring Person
               became such, or (iii) a transferee of such Acquiring Person (or
               of any such Associate or Affiliate) who becomes a transferee
               prior to or concurrently with the Acquiring Person's 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 the Board of Directors of the
               Company has determined is part of a plan, arrangement or
               understanding which has as a primary purpose or effect the
               avoidance of this Section 11(a)(ii), 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 



                                       13
<PAGE>   17

               provision of this Agreement or otherwise. The Company shall use
               all reasonable efforts to insure that the provisions of this
               Section 11(a)(ii) and Section 4(b) hereof are complied with, but
               shall have no liability to any holder of Right Certificates or
               other Person as a result of its failure to make any
               determinations with respect to an Acquiring Person or its
               Affiliates, Associates or transferees hereunder. No Right
               Certificate shall be issued at any time upon the transfer of any
               Rights to an Acquiring Person whose Rights would be void pursuant
               to the preceding sentence or any Associate or Affiliate thereof
               or to any nominee of such Acquiring Person, Associate or
               Affiliate; and any Right Certificate delivered to the Rights
               Agent for transfer to an Acquiring Person whose Rights would be
               void pursuant to the preceding sentence shall be canceled.

       (iii)   In lieu of issuing Common Shares in accordance with Section
               11(a)(ii) hereof, the Company may, if a majority of the Board of
               Directors then in office determines that such action is necessary
               or appropriate and not contrary to the interests of holders of
               Rights, elect to (and, in the event that the Board of Directors
               has not exercised the exchange right contained in Section 24(c)
               hereof and there are not sufficient authorized but unissued
               Common Shares to permit the exercise in full of the Rights in
               accordance with the foregoing subparagraph (ii), the Company
               shall) take all such action as may be necessary to authorize,
               issue or pay, upon the exercise of the Rights, cash (including by
               way of a reduction of the Purchase Price), property, Common
               Shares, other securities or any combination thereof having an
               aggregate value equal to the value of the Common Shares which
               otherwise would have been issuable pursuant to Section 11(a)(ii)
               hereof, which aggregate value shall be determined by a nationally
               recognized investment banking firm selected by a majority of the
               Board of Directors then in office. For purposes of the preceding
               sentence, the value of the Common Shares shall be determined
               pursuant to Section 11(d) hereof. Any such election by the Board
               of Directors must be made within 60 days following the date on
               which the event described in Section 11(a)(ii) hereof shall have
               occurred. Following the occurrence of the event described in
               Section 11(a)(ii) hereof, a majority of the Board of Directors
               then in office may suspend the exercisability of the Rights for a
               period of up to 60 days following the date on which the event
               described in Section 11(a)(ii) hereof shall have occurred to the
               extent that such directors have not determined whether to
               exercise their rights of election under this Section 11(a)(iii).
               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.

     (b)  In case the Company shall fix a record date for the issuance of
          rights, options or warrants to all holders of Preferred Shares
          entitling them (for a 



                                       14
<PAGE>   18

          period expiring within 45 calendar days after such record date) to
          subscribe for or purchase Preferred Shares (or shares having the same
          designations and the powers, preferences and rights, and the
          qualifications, limitations and restrictions as the Preferred Shares
          ("equivalent preferred shares")) or securities convertible into
          Preferred Shares or equivalent preferred shares at a price per
          Preferred Share or equivalent preferred share (or having a conversion
          price per share, if a security convertible into Preferred Shares or
          equivalent preferred shares) less than the then current per share
          market price of the Preferred Shares (as such term is hereinafter
          defined) on such record date, the Purchase Price to be in effect after
          such record date shall be determined by multiplying the Purchase Price
          in effect immediately prior to such record date by a fraction, the
          numerator of which shall be the number of Preferred Shares outstanding
          on such record date plus the number of Preferred Shares which the
          aggregate offering price of the total number of Preferred Shares
          and/or equivalent preferred shares so to be offered (and/or the
          aggregate initial conversion price of the convertible securities so to
          be offered) would purchase at such current market price and the
          denominator of which shall be the number of Preferred Shares
          outstanding on such record date plus the number of additional
          Preferred Shares and/or equivalent preferred shares to be offered for
          subscription or purchase (or into which the convertible securities so
          to be offered are initially convertible); provided, however, that in
          no event shall the consideration to be paid upon the exercise of one
          Right be less than the aggregate par value of the shares of capital
          stock of the 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 the Board of Directors of the
          Company, whose determination shall be described in a statement filed
          with the Rights Agent. Preferred 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 Purchase Price
          shall be adjusted to be the Purchase Price which would then be in
          effect if such record date had not been fixed.

     (c)  In case the Company shall fix a record date for the making of a
          distribution to all holders of the Preferred Shares (including any
          such distribution made in connection with a consolidation or merger in
          which the Company is the continuing or surviving corporation) of
          evidences of indebtedness or assets (other than a regular quarterly
          cash dividend or a dividend payable in Preferred Shares) or
          subscription rights or warrants (excluding those referred to in
          Section 11(b) hereof), the Purchase Price to be in effect after such
          record date shall be determined by multiplying the Purchase Price in
          effect immediately prior to such record date by a fraction, the
          numerator of which shall be the then current per share market price of
          the Preferred Shares (as such term is hereinafter defined) on such
          record date, less the fair market value (as determined in good faith
          by the 



                                       15
<PAGE>   19

          Board of Directors of the Company, whose determination shall be
          described in a statement filed with the Rights Agent) of the portion
          of the assets or evidences of indebtedness so to be distributed or of
          such subscription rights or warrants applicable to one Preferred Share
          and the denominator of which shall be such current per share market
          price of the Preferred Shares; provided, however, that in no event
          shall the consideration to be paid upon the exercise of one Right be
          less than the aggregate par value of the shares of capital stock of
          the Company to be issued upon exercise of one Right. Such adjustments
          shall be made successively whenever such a record date is fixed; and
          in the event that such distribution is not so made, the Purchase Price
          shall again be adjusted to be the Purchase Price which would then be
          in effect if such record date had not been fixed.

     (d)  

          (i)  For the purpose of any computation hereunder, the "current per
               share market price" of any security (a "Security" for the purpose
               of this Section 11(d)(i)) on any date shall be deemed to be the
               average of the daily closing prices per share of such Security
               for the 30 consecutive Trading Days (as such term is hereinafter
               defined) immediately prior to such date; provided, however, that
               in the event that the current per share market price of the
               Security is determined during a period following the announcement
               by the issuer of such Security of (A) a dividend or distribution
               on such Security payable in shares of such Security or securities
               convertible into such shares, or (B) any subdivision, combination
               or reclassification of such Security or securities convertible
               into such shares, or (C) any subdivision, combination or
               reclassification of such Security and prior to the expiration of
               30 Trading Days 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 system with respect to securities listed on
               the principal national securities exchange on which the Security
               is listed or admitted to trading or as reported on the Nasdaq
               National Market or, if the Security is not listed or admitted to
               trading on any national securities exchange or reported on the
               Nasdaq National Market, the last quoted price or, if not so
               quoted, the average of the high bid and low asked prices in the
               over-the-counter market, as 



                                       16
<PAGE>   20

               reported by the National Association of Securities Dealers, Inc.
               Automated Quotations System ("Nasdaq") or such other system then
               in use, or, if on any such date the Security is not quoted by any
               such organization, the average of the closing bid and asked
               prices as furnished by a professional market maker making a
               market in the Security selected by the Board of Directors of the
               Company or, if on any such date no professional market maker is
               making a market in the Security, the price as determined in good
               faith by the Board of Directors. The term "Trading Day" shall
               mean a day on which the principal national securities exchange on
               which the Security is listed or admitted to trading is open for
               the transaction of business or, if the Security is not listed or
               admitted to trading on any national securities exchange, a
               Business Day.

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

     (e)  No adjustment in the Purchase Price shall be required unless such
          adjustment would require an increase or decrease of at least 1% in the
          Purchase Price; provided, however, that any adjustments which by
          reason of this Section 11(e) are not required to be made shall be
          carried forward and taken into account in any subsequent adjustment.
          All calculations under this Section 11 shall be made to the nearest
          cent or to the nearest one one-hundredth of a Preferred Share or one
          ten-thousandth of any other share or security as the case may be.
          Notwithstanding the first sentence of this Section 11(e), any
          adjustment required by this Section 11 shall be made no later than the
          earlier of (i) three years from the date of the transaction which
          requires such adjustment or (ii) the date of the expiration of the
          right to exercise any Rights.

     (f)  If as a result of an adjustment made pursuant to Section 11(a) hereof,
          the holder of any Right thereafter exercised shall become entitled to
          receive any shares of capital stock of the Company other than
          Preferred Shares, thereafter the number of such other shares so
          receivable upon exercise of any Right shall be subject to adjustment
          from time to time in a manner and on terms as nearly equivalent as
          practicable to the provisions with respect 



                                       17
<PAGE>   21

          to the Preferred Shares contained in Sections 11(a) through 11(c)
          hereof, inclusive, and the provisions of Sections 7, 9, 10, 13 and 14
          hereof with respect to the Preferred Shares shall apply on like terms
          to any such other shares.

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

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

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



                                       18
<PAGE>   22

          such holders prior to the date of adjustment, and upon surrender
          thereof, if required by the Company, new Right Certificates evidencing
          all the Rights to which such holders shall be entitled after such
          adjustment. Right Certificates so to be distributed shall be issued,
          executed and countersigned in the manner provided for herein and shall
          be registered in the names of the holders of record of Right
          Certificates on the record date specified in the public announcement.

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

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

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

     (m)  The Company covenants and agrees that, after the Distribution Date, it
          will not, except as permitted by Section 23 or Section 27 hereof, take
          (or permit any Subsidiary to take) any action the purpose of which is
          to, or if at the time such action is taken it is reasonably
          foreseeable that the effect of such action is to, materially diminish
          or eliminate the benefits intended to be afforded by the Rights. Any
          such action taken by the Company during any period after any Person
          becomes an Acquiring Person but prior to the Distribution Date shall
          be null and void unless such action could be taken under this Section
          11(m) from and after the Distribution Date.

     (n)  Anything in this Section 11 to the contrary notwithstanding, the
          Company shall be entitled to make such reductions in the Purchase
          Price, in addition to those adjustments expressly required by this
          Section 11, as and to the extent that it in its sole discretion shall
          determine to be advisable in order that any consolidation or
          subdivision of the Preferred Shares, issuance wholly for cash of any
          Preferred Shares at less than the current market 



                                       19
<PAGE>   23

          price, issuance wholly for cash of Preferred Shares or securities
          which by their terms are convertible into or exchangeable for
          Preferred Shares, dividends on Preferred Shares payable in Preferred
          Shares or issuance of rights, options or warrants referred to
          hereinabove in Section 11(b), hereafter made by the Company to holders
          of its Preferred Shares shall not be taxable to such shareholders.

     (o)  In the event that at any time after the date of this Agreement and
          prior to the Distribution Date, the Company shall (i) declare or pay
          any dividend on the Common Shares payable in Common Shares or (ii)
          effect a subdivision, combination or consolidation of the Common
          Shares (by reclassification or otherwise than by payment of dividends
          in Common Shares) into a greater or lesser number of Common Shares,
          then in any such case (A) the number of one one-hundredths of a
          Preferred Share purchasable after such event upon proper exercise of
          each Right shall be determined by multiplying the number of one
          one-hundredths of a Preferred Share so purchasable immediately prior
          to such event by a fraction, the numerator of which is the number of
          Common Shares outstanding immediately before such event and the
          denominator of which is the number of Common Shares outstanding
          immediately after such event, and (B) each Common Share outstanding
          immediately after such event shall have issued with respect to it that
          number of Rights which each Common Share outstanding immediately prior
          to such event had issued with respect to it. The adjustments provided
          for in this Section 11(o) shall be made successively whenever such a
          dividend is declared or paid or such a subdivision, combination or
          consolidation is effected.

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

SECTION 12. CERTIFICATE OF ADJUSTED PURCHASE 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 Common Shares or
     the Preferred Shares a copy of such certificate and (c) mail a brief
     summary thereof to each holder of a Right Certificate in accordance with
     Section 25 hereof. The Rights Agent shall be fully protected in relying on
     any such certificate and on any adjustment therein contained and shall not
     be deemed to have knowledge of any 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 the Shares Acquisition Date or, if a
          Transaction is proposed, the Distribution Date, directly or indirectly
          (x) the Company shall consolidate with, or merge with and into, any
          Interested Shareholder, or if in such merger or consolidation all
          holders of Common Stock are not treated alike, any other Person, (y)
          any Interested Person, or if in such merger or consolidation all
          holders of 



                                       20
<PAGE>   24

          Common Stock are not treated alike, any other 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 merger (other
          than, in the case of either transaction described in (x) or (y), a
          merger or consolidation which would result in all of the voting power
          represented by the securities of the Company outstanding immediately
          prior thereto continuing to represent (either by remaining outstanding
          or by being converted into securities of the surviving entity) all of
          the voting power represented by the securities of the Company or such
          surviving entity outstanding immediately after such merger or
          consolidation and the holders of such securities not having changed as
          a result of such merger or consolidation), or (z) the Company shall
          sell, mortgage or otherwise transfer (or one or more of its
          subsidiaries shall sell, mortgage or otherwise transfer), in one or
          more transactions, assets or earning power aggregating more than 50%
          of the assets or earning power of the Company and its subsidiaries
          (taken as a whole) to any Interested Shareholder or Shareholders, or
          if in such transaction all holders of Common Stock are not treated
          alike, any other Person, (other than the Company or any Subsidiary of
          the Company in one or more transactions each of which individually and
          the aggregate does not violate Section 13(d) hereof) then, and in each
          such case, proper provision shall be made so that (i) each holder of a
          Right, subject to Section 11(a)(ii) hereof, shall have the right to
          receive, upon the exercise thereof at a price equal to the then
          current Purchase Price multiplied by the number of one one-hundredths
          of a Preferred Share for which a Right is then exercisable in
          accordance with the terms of this Agreement and in lieu of Preferred
          Shares, such number of freely tradeable Common Shares of the Principal
          Party (as such term is hereinafter defined), free and clear of liens,
          rights of call or first refusal, encumbrances or other adverse claims,
          as shall be equal to the result obtained by (A) multiplying the then
          current Purchase Price by the number of one one-hundredths of a
          Preferred Share for which a Right is then exercisable (without taking
          into account any adjustment previously made pursuant to Section
          11(a)(ii) hereof) and dividing that product by (B) 50% of the then
          current per share market price of the Common Shares of such Principal
          Party (determined pursuant to Section 11(d) hereof) on the date of
          consummation of such consolidation, merger, sale or transfer; (ii)
          such Principal Party shall thereafter be liable for, and shall assume,
          by virtue of such consolidation, merger, sale or transfer, all the
          obligations and duties of the Company pursuant to this Agreement;
          (iii) the term "Company" shall thereafter be deemed to refer to such
          Principal Party, it being specifically intended that the provisions of
          Section 11 hereof shall apply to such Principal Party; and (iv) such
          Principal Party shall take such steps (including, but not limited to,
          the reservation of a sufficient number of shares of its Common Shares
          in accordance with Section 9 hereof) in connection with such
          consummation as may be necessary to assure that the provisions hereof
          shall thereafter be applicable, as nearly as reasonably may be, in
          relation 



                                       21
<PAGE>   25

          to its Common Shares thereafter deliverable upon the exercise of the
          Rights.

     (b)  "Principal Party" shall mean:

          (i)  in the case of any transaction described in clause (x) or (y) of
               the first sentence of Section 13(a) hereof, the Person that is
               the issuer of any securities into which Common Shares are
               converted in such merger or consolidation, and if no securities
               are so issued, the Person that is the other party to the merger
               or consolidation (or, if applicable, the Company, if it is the
               surviving corporation); and

          (ii) in the case of any transaction described in (z) of the first
               sentence 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;

          provided, however, that in any case, (1) if the Common Shares of such
          Person are not at such time and have not been continuously over the
          preceding 12-month period registered under Section 12 of the Exchange
          Act, and such Person is a direct or indirect subsidiary or Affiliate
          of another Person the Common Shares of which are and have been so
          registered, "Principal Party" shall refer to such other Person; (2) if
          such Person is a subsidiary, directly or indirectly, or Affiliate of
          more than one Person, the Common Shares of two or more of which are
          and have been so registered, "Principal Party" shall refer to
          whichever of such Persons is the issuer of the Common Shares having
          the greatest aggregate market value; and (3) 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 (1) and (2) above shall apply to each
          of the chains of ownership having an interest in such joint venture as
          if such party were a "subsidiary" of both or all of such joint
          venturers and the Principal Parties in each such chain shall bear the
          obligations set forth in this Section 13 in the same ratio as their
          direct or indirect interests in such Person bear to the total of such
          interests.

     (c)  The Company shall not consummate any such consolidation, merger, sale
          or transfer 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 each
          Principal Party and each other Person who may become a Principal Party
          as a result of such consolidation, merger, sale or transfer shall have
          (i) executed and delivered to the Rights Agent a supplemental
          agreement providing for the terms set forth in paragraphs (a) and (b)
          of this Section 13 and (ii) prepared, filed and had declared and
          remain effective a registration statement under the Act on the
          appropriate form with respect to the Rights and the securities
          exercisable upon exercise of the Rights and further providing that, as
          soon as practicable after the date of any consolidation, 



                                       22
<PAGE>   26

          merger, sale or transfer of assets mentioned in paragraph (a) of this
          Section 13, the Principal Party at its own expense will:

          (i)  cause the registration statement under the Act with respect to
               the Rights and the securities purchasable upon exercise of the
               Rights on an appropriate form to remain effective (with a
               prospectus at all times meeting the requirements of the Act)
               until the Final Expiration Date;

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

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

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

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

     (d)  After the Distribution Date, the Company covenants and agrees that it
          shall not (i) consolidate with, (ii) merge with or into, or (iii) sell
          or transfer to, in one or more transactions, assets or earning power
          aggregating more than 50% of the assets or earning power of the
          Company and its subsidiaries taken as a whole, any other Person (other
          than a Subsidiary of the Company in a transaction which does not
          violate Section 11(m) hereof), if (x) at the time of or after such
          consolidation, merger or sale there are any charter or bylaw
          provisions or any rights, warrants or other instruments or securities
          outstanding, agreements in effect or any other action taken which
          would diminish or otherwise eliminate the benefits intended to be
          afforded by the Rights or (y) prior to, simultaneously with or
          immediately after such consolidation, merger or sale, the shareholders
          of the Person who constitutes, or would constitute, the "Principal
          Party" for purposes of Section 13(a) hereof shall have received a
          distribution of Rights previously owned by such Person or any of its
          Affiliates and Associates. The Company shall not consummate any such
          consolidation, merger, sale or transfer unless prior thereto the
          Company and such other Person shall have executed and delivered to the
          Rights Agent a 



                                       23
<PAGE>   27

          supplemental agreement evidencing compliance with this Section 13(d).

SECTION 14. FRACTIONAL RIGHTS AND FRACTIONAL SHARES.

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

     (b)  The Company shall not be required to issue fractions of Preferred
          Shares (other than fractions which are integral multiples of one
          one-hundredth of a Preferred Share) upon exercise of the Rights or to
          distribute certificates which evidence fractional Preferred Shares
          (other than fractions which are integral multiples of one
          one-hundredth of a Preferred Share). Fractions of Preferred Shares in
          integral multiples of one one-hundredth of a Preferred Share may, at
          the election of the Company, be evidenced by depositary receipts;
          provided, however, that holders of such depositary receipts shall have
          all of the designations and the powers, preferences and rights, and
          the qualifications, limitations and restrictions 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-hundredth of a Preferred Share,
          the Company shall pay to the registered holders of Right Certificates
          at the time such Rights are exercised as herein provided an amount in
          cash equal 



                                       24
<PAGE>   28

          to the same fraction of the current market value of one Preferred
          Share. For the purposes of this Section 14(b), the current market
          value of a Preferred Share shall be the current per share market price
          of the Preferred Shares (as determined pursuant to the second sentence
          of Section 11(d)(i) hereof) for the Trading Day immediately prior to
          the date of such exercise (or, if not publicly traded, in accordance
          with Section 11(d)(ii) hereof).

     (c)  Following the occurrence of one of the transactions or events
          specified in Section 11 hereof giving rise to the right to receive
          Common Shares, capital stock equivalents (other than Preferred Shares)
          or other securities upon the exercise of a Right, the Company shall
          not be required to issue fractions of Common Shares or units of such
          Common Shares, capital stock equivalents or other securities upon
          exercise of the Rights or to distribute certificates which evidence
          fractional Common Shares, capital stock equivalents or other
          securities. In lieu of fractional Common Shares, capital stock
          equivalents or other securities, the Company shall pay to the
          registered holders of Right Certificates at the time such Rights are
          exercised as herein provided an amount in cash equal to the same
          fraction of the current market value of one Common Share or unit of
          such Common Shares, capital stock equivalents or other securities. For
          purposes of this Section 14(c), the current market value shall be the
          current per share market price (as determined pursuant to Section
          11(d)(i) hereof) for the Trading Day immediately prior to the date of
          such exercise and, if such capital stock equivalent is not traded,
          each such capital stock equivalent shall have the value of one
          one-hundredth of a Preferred Share.

     (d)  The holder of a Right by the acceptance of the Right expressly waives
          his right to receive any fractional Rights or any fractional shares
          upon exercise of a Right (except as provided above).

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 Sections 18
     and 20 hereof, are vested in the respective registered holders of the Right
     Certificates (and, prior to the Distribution Date, the registered holders
     of the Common Shares) and any registered holder of any Right Certificate
     (or, prior to the Distribution Date, of the Common Shares), without the
     consent of the Rights Agent or of the holder of any other Right Certificate
     (or, prior to the Distribution Date, of the Common Shares), may, in his own
     behalf and for his own benefit, enforce, and may institute and maintain any
     suit, action or proceeding against the Company to enforce, or otherwise act
     in respect of, his right to exercise the Rights evidenced by such Right
     Certificate in the manner provided in such Right Certificate and in this
     Agreement. Without limiting the foregoing or any remedies available to the
     holders of Rights, it is specifically acknowledged that the holders of
     Rights would not have an adequate remedy at law for any breach of this
     Agreement and will be entitled to specific performance of the obligations
     under, and injunctive relief against actual or threatened violations of the
     obligations of any Person subject to, this Agreement. Holders of Rights
     shall be entitled to recover the reasonable costs and expenses, including
     attorneys fees, incurred by them in any action to enforce the provisions of
     this Agreement.



                                       25
<PAGE>   29

SECTION 16. AGREEMENT OF RIGHT 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 Right Certificates are transferable
          (subject to the provisions of this Rights Agreement) only on the
          registry books of the Rights Agent if surrendered at the principal
          office of the Rights Agent, duly endorsed or accompanied by a proper
          instrument of transfer; and

     (c)  the Company and the Rights Agent may deem and treat the person in
          whose name the Right Certificate (or, prior to the Distribution Date,
          the associated Common Shares certificate) is registered as the
          absolute owner thereof and of the Rights evidenced thereby
          (notwithstanding any notations of ownership or writing on the Right
          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. RIGHT CERTIFICATE HOLDER NOT DEEMED A SHAREHOLDER. No holder, as
     such, of any Right Certificate shall be entitled to vote, receive dividends
     or be deemed for any purpose the holder of the Preferred Shares or any
     other securities of the Company which may at any time be issuable on the
     exercise of the Rights represented thereby, nor shall anything contained
     herein or in any Right Certificate be construed to confer upon the holder
     of any Right Certificate, as such, any of the rights of a 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 Right Certificate shall have
     been exercised in accordance with the provisions hereof.

SECTION 18. CONCERNING THE RIGHTS AGENT. 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 gross negligence, bad faith or willful
     misconduct on the part of the Rights Agent, for anything done or omitted by
     the Rights Agent in connection with the acceptance and administration of
     this Agreement, including the costs and expenses of defending against any
     claim of liability in the premises. The indemnity provided herein shall
     survive the expiration of the Rights and the termination of this Agreement.



                                       26
<PAGE>   30

     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 Right 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 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. In no case will the Rights
     Agent be liable for special, indirect, incidental or consequential or
     consequential loss or damage at any kind whatsoever (including but not
     limited to lost profits), even if the Rights Agent has been advised of such
     loss or damage.

SECTION 19. MERGER OR CONSOLIDATION OR CHANGE OF NAME OF RIGHTS AGENT. 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 shareholder services or 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 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 Right 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 Right
     Certificates so countersigned; and in case at that time any of the Right
     Certificates shall not have been countersigned, any successor Rights Agent
     may countersign such Right Certificates either in the name of the
     predecessor Rights Agent or in the name of the successor Rights Agent; and
     in all such cases such Right Certificates shall have the full force
     provided in the Right Certificates and in this Agreement

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

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

     (a)  The Rights Agent may consult with legal counsel of its choice (who may



                                       27
<PAGE>   31

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

     (b)  Whenever in the performance of its duties under this Agreement the
          Rights Agent shall deem it necessary or desirable that any fact or
          matter 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, the Chief Financial Officer, any Vice
          President, the Treasurer or the Secretary of the Company and delivered
          to the Rights Agent; and such certificate shall be full authorization
          to the Rights Agent for any action taken or suffered in good faith by
          it under the provisions of this 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 gross 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
          Right 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 Right Certificate (except its
          countersignature thereof); nor shall it be responsible for any breach
          by the Company of any covenant or condition contained in this
          Agreement or in any Right Certificate; nor shall it be responsible for
          any change in the exercisability of the Rights (including the Rights
          becoming void pursuant to Section 11(a)(ii) hereof) 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 hereof, 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 Right Certificates after receipt of a certificate
          pursuant to Section 12 hereof 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 Right
          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



                                       28
<PAGE>   32

          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, the Chief Financial Officer, any Vice
          President, the Secretary or the Treasurer of the Company, and to apply
          to such officers for advice or instructions in connection with its
          duties, and it shall not be liable for any action taken or suffered 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 with
          respect to its duties or obligations under this Agreement and the date
          on and/or after which such action shall be taken or omitted and the
          Rights Agent shall not be liable for any action taken or omitted in
          accordance with a proposal included in any such application on or
          after the date specified therein (which date shall not be less than
          three business days after the date indicated in such application
          unless any such officer shall have consented in writing to an earlier
          date) unless, prior to taking or omitting any such action, the Rights
          Agent has 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.



                                       29
<PAGE>   33

     (k)  If, with respect to any Right 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
          not been executed, the Rights Agent shall not take any further action
          with respect to such requested exercise of transfer without first
          consulting with the Company.

SECTION 21. CHANGE OF RIGHTS AGENT. The Rights Agent or any successor Rights
     Agent may resign and be discharged from its duties under this Agreement
     upon 30 days' notice in writing mailed to the Company and to each transfer
     agent for the Common Shares or Preferred Shares by registered or certified
     mail, and to the holders of the Right Certificates by first-class mail. The
     Company may remove the Rights Agent or any successor Rights Agent upon 30
     days' notice in writing, mailed to the Rights Agent or successor Rights
     Agent, as the case may be, and to each transfer agent for the Common Shares
     or Preferred Shares by registered or certified mail, and to the holders of
     the Right Certificates by first-class mail. If the Rights Agent shall
     resign or be removed or shall otherwise become incapable of acting, the
     Company shall appoint a successor to the Rights Agent. If the Company shall
     fail to make such appointment within a period of 30 days after giving
     notice of such removal or after it has been notified in writing of such
     resignation or incapacity by the resigning or incapacitated Rights Agent or
     by the holder of a Right Certificate (who shall, with such notice, submit
     his Right Certificate for inspection by the Company), then the registered
     holder of any Right Certificate may apply to any court of competent
     jurisdiction for the appointment of a new Rights Agent. Any successor
     Rights Agent, whether appointed by the Company or by such a court, shall be
     either (a) a corporation business trust or limited liability company
     organized and doing business under the laws of the United States or of any
     other state of the United States which is authorized under such laws to
     exercise corporate trust or stock transfer powers and is subject to
     supervision or examination by federal or state authority and which has at
     the time of its appointment as Rights Agent a combined capital and surplus
     of at least $50 million or (b) a direct or indirect wholly owned subsidiary
     of such an entity or its wholly owning parent. 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 for the Common Shares
     or Preferred Shares, and mail a notice thereof in writing to the registered
     holders of the Right Certificates. Failure to give any notice provided for
     in this Section 21, however, or any defect therein, shall not affect the
     legality or validity of the resignation or removal of the Rights Agent or
     the appointment of the successor Rights Agent, as the case may be.

SECTION 22. ISSUANCE OF NEW RIGHT CERTIFICATES. Notwithstanding any of the
     provisions of this Agreement or of the Rights to the contrary, the Company
     may, at its option, issue new Right Certificates evidencing Rights in such
     form as may be approved by its Board of Directors to reflect any adjustment
     or change in the Purchase Price 



                                       30
<PAGE>   34

     and the number or kind or class of shares or other securities or property
     purchasable under the Right Certificates made in accordance with the
     provisions of this Agreement. In addition, in connection with the issuance
     or sale of Common Shares following the Distribution Date and prior to the
     earlier of the Redemption Date and the Final Expiration Date, the 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 in
     existence prior to the Distribution Date, or upon the exercise, conversion
     or exchange of securities, notes or debentures issued by the Company and in
     existence prior to the Distribution Date, and (b) may, in any other case,
     if deemed necessary or appropriate by the Board of Directors of the
     Company, issue Right Certificates representing the appropriate number of
     Rights in connection with such issuance or sale; provided, however, that
     (i) the Company shall not be obligated to issue any such Right Certificates
     if, and to the extent that, the Company shall be advised by counsel that
     such issuance would create a significant risk of material adverse tax
     consequences to the Company or the Person to whom such Right Certificate
     would be issued, and (ii) no Right Certificate shall be issued if, and to
     the extent that, appropriate adjustment shall otherwise have been made in
     lieu of the issuance thereof.

SECTION 23. REDEMPTION.

     (a)  The Rights may be redeemed by action of the Board of Directors
          pursuant to Section 23(b) hereof and shall not be redeemed in any
          other manner.

     (b)  

          (i)  The Board of Directors of the Company may, at its option, at any
               time prior to the earlier of such time as any Person becoming an
               Acquiring Person or the Final Expiration Date, redeem all but not
               less than all of the then outstanding Rights at a redemption
               price of $0.001 per Right, appropriately adjusted to reflect any
               stock split, stock dividend or similar transaction occurring
               after the date hereof (such redemption price being hereinafter
               referred to as the "Redemption Price, and the Company may, at its
               option, pay the Redemption Price in Common Shares (based on the
               "current per-share market price," as such term is defined in
               Section 11(d) hereof, of the Common Shares at the time of
               redemption), cash or any other form of consideration deemed
               appropriate by the Board of Directors. The redemption of the
               Rights by the Board of Directors may be made effective at such
               time, on such basis and subject to such conditions as the Boar of
               Directors in its sole discretion may establish. Notwithstanding
               anything contained in this Agreement to the contrary, the Rights
               shall not be exercisable pursuant to Section 11(a)(ii) hereof
               prior to the expiration or termination of the Company's right of
               redemption under this Section 23(b)(i).

          (ii) In addition, the Board of Directors of the Company may, at its



                                       31
<PAGE>   35

               option, at any time after the time a Person becomes an Acquiring
               Person and the expiration of any period during which the holder
               of Rights may exercise the rights under Section 11(a)(ii) hereof
               but prior to any event described in clause (x), (y) or (z) of the
               first sentence of Section 13 hereof, redeem all but not less than
               all of the then outstanding Rights at the Redemption Price (x) in
               connection with any merger, consolidation or sale or other
               transfer (in one transaction or in a series of related
               transactions) of assets or earning power aggregating 50% or more
               of the assets or earning power of the Company and its
               subsidiaries (taken as a whole) in which all holders of Common
               Shares are treated alike and not involving (other than as a
               holder of Common Shares being treated like all other such
               holders) an Interested Shareholder or a Transaction Person or
               (y)(A) if and for so long as the Acquiring Person is not
               thereafter the Beneficial Owner of 15% or more of the then
               outstanding Common Shares, and (B) at the time of redemption no
               other Persons are Acquiring Persons.

          (c)  Immediately upon the action of the Board of Directors of the
               Company ordering the redemption of the Rights pursuant to Section
               23(b) hereof, 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 10 days after such
               action of the Board of Directors ordering the redemption of the
               Rights pursuant to Section 23(b) hereof, the Company shall mail a
               notice of redemption to all the holders of the then outstanding
               Rights at their last addresses as they appear upon the registry
               books of the Rights Agent or, prior to the Distribution Date, on
               the registry books of the transfer agent for the Common Shares,
               provided, however, that failure to give, or any defect in, any
               such notice shall not affect the validity of such redemption. 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.

          (d)  The Company may, at its option, discharge all of its obligations
               with respect to any redemption of the Rights by (i) issuing a
               press release announcing the manner of redemption of the Rights
               and (ii) mailing payment of the Redemption Price to the
               registered holders of the Rights at their last addresses as they
               appear on the registry books of the Rights Agent or, prior to the
               Distribution Date, on the registry books of the transfer agent
               for the Common Shares, and upon such action, all 



                                       32
<PAGE>   36

          outstanding Right Certificates shall be null and void without any
          further action by the Company.

SECTION 24. EXCHANGE.

     (a)  The Board of Directors of the Company may, at its option, at any time
          after any Person becomes an Acquiring Person, exchange all or part of
          the then outstanding and exercisable Rights (which shall not include
          Rights that have become void pursuant to the provisions of Section
          11(a)(ii) 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 "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 of the Company
          ordering the exchange of any Rights pursuant to Section 24(a) hereof
          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 promptly give
          public notice of any such exchange; provided, however, that the
          failure to give, or any defect in, such notice shall not affect the
          validity of such exchange. The Company promptly shall mail a notice of
          any such exchange to all of the holders of such Rights at their last
          addresses as they appear upon the registry books of the Rights Agent;
          provided, however, that the failure to give, or any defect in, such
          notice shall not affect the validity of such exchange. 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 11(a)(ii) hereof) held by each holder of Rights.

     (c)  In lieu of issuing Common Shares in accordance with Section 24(a)
          hereof, the Company may, if a majority of the Board of Directors then
          in office determines that such action is necessary or appropriate and
          not contrary to the interests of the holders of Rights, elect to (and,
          in the event that there are not sufficient authorized but unissued
          Common Shares to permit any exchange of the Rights in accordance with
          Section 24(a) 



                                       33
<PAGE>   37

          hereof, the Company shall) take all such action as may be necessary to
          authorize, issue or pay, upon the exchange of the Rights, cash
          (including by way of a reduction of the Purchase Price), property,
          Common Shares, other securities or any combination thereof having an
          aggregate value equal to the value of the Common Shares which
          otherwise would have been issuable pursuant to Section 24(a) hereof,
          which aggregate value shall be determined by a nationally recognized
          investment banking firm selected by a majority of the Board of
          Directors then in office. For purposes of the preceding sentence, the
          value of the Common Shares shall be determined pursuant to Section
          11(d) hereof. Any election pursuant to this Section 24(c) by the Board
          of Directors must be made within 60 days following the date on which
          the event described in Section 11(a)(ii) hereof shall have occurred.
          Following the occurrence on the event described in Section 11(a)(ii)
          hereof, a majority of the Board of Directors then in office may
          suspend the exercisability of the Rights for a period of up to 60 days
          following the date on which the event described in Section 11(a)(ii)
          hereof shall have occurred to the extent that such directors have not
          determined whether to exercise their rights of election under this
          Section 24(c). 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.

     (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, the Company shall pay to the
          registered holders of the Right Certificates with regard to which such
          fractional Common Shares would otherwise be issuable an amount in cash
          equal to the same fraction of the current market value of a whole
          Common Share. For the purposes of this Section 24(d), the current
          market value of a whole Common Share shall be the closing price of a
          Common Share (as determined pursuant to the second sentence of Section
          11(d)(i) hereof) for the Trading Day immediately after the date of the
          first public announcement by the Company that an exchange is to be
          effected pursuant to this Section 24.

     (e)  The Company shall not be required to issue fractions of Preferred
          Shares (other than fractions which are integral multiples of one
          one-hundredth of a Preferred Share) upon exchange of the Rights or to
          distribute certificates which evidence fractional Preferred Shares
          (other than fractions which are integral multiples of one
          one-hundredth of a Preferred Share). Fractions of Preferred Shares in
          integral multiples of one one-hundredth of a Preferred Share may, at
          the election of the Company, be evidenced by depositary receipts;
          provided, however, that holders of such depositary receipts shall have
          all of 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-hundredth of a Preferred Share,
          the Company shall pay to the registered holders of Right Certificates
          at the time such Rights are exercised as herein provided an amount in
          cash equal 



                                       34
<PAGE>   38

          to the same fraction of the current market value of one Preferred
          Share. For the purposes of this Section 24(e), the current market
          value of a Preferred Share shall be one hundred (100) times the
          closing price of a Common Share (as determined pursuant to the second
          sentence of Section 11(d)(i) hereof) for the Trading Day immediately
          after the date of the first public announcement by the Company that an
          exchange is to be effected pursuant to this Section 24.

SECTION 25. NOTICE OF CERTAIN EVENTS.

     (a)  In case the Company shall propose (i) to pay any dividend payable in
          stock of any class to the holders of its Preferred Shares or to make
          any other distribution to the holders of its Preferred Shares (other
          than a regular quarterly cash dividend), (ii) to offer to the holders
          of its Preferred Shares rights or warrants to subscribe for or to
          purchase any additional Preferred Shares or shares of stock of any
          class or any other securities, rights or options, (iii) to effect any
          reclassification of its Preferred Shares (other than a
          reclassification involving only the subdivision of outstanding
          Preferred Shares), (iv) to effect any consolidation or merger into or
          with, or to effect any sale or other transfer (or to permit one or
          more of its Subsidiaries to effect any sale or other transfer), in one
          or more transactions, of 50% or more of the assets or earning power of
          the Company and its Subsidiaries (taken as a whole), to any other
          Person, (v) to effect the liquidation, dissolution or winding up of
          the Company, or (vi) to declare or pay any dividend on the Common
          Shares payable in Common Shares or to effect a subdivision,
          combination or consolidation of the Common Shares (by reclassification
          or otherwise than by payment of dividends in Common Shares), then, in
          each such case, the Company shall give to each holder of a Right
          Certificate, in accordance with Section 26 hereof, a notice of such
          proposed action, which shall specify the record date for the purpose
          of such stock dividend, or distribution of rights or warrants, or the
          date on which such reclassification, consolidation, merger, sale,
          transfer, liquidation, dissolution, or winding up is to take place and
          the date of participation therein by the holders of the Common Shares
          and/or the Preferred Shares, if any such date is to be fixed, and such
          notice shall be so given in the case of any action covered by clause
          (i) or (ii) above at least 10 days prior to the record date for
          determining holders of the Preferred Shares for purposes of such
          action, and in the case of any such other action, at least 10 days
          prior to the date of the taking of such proposed action or the date of
          participation therein by the holders of the Common Shares and/or the
          Preferred Shares, whichever shall be the earlier.

     (b)  In case the event set forth in Section 11(a)(ii) hereof shall occur,
          then the Company shall as soon as practicable thereafter give to each
          holder of a Right Certificate, in accordance with Section 26 hereof, a
          notice of the occurrence of such event, which notice shall describe
          the event and the consequences of the event to holders of Rights under
          Section 11(a)(ii) hereof.



                                       35
<PAGE>   39

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

          Aradigm Corporation 
          26219 Eden Landing Road 
          Hayward, CA 94545 Attn:
          Chief Financial Officer

     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 Right Certificate to or on the Rights Agent shall be
     sufficiently given or made if sent by first-class mail, postage prepaid,
     addressed (until another address is filed in writing with the Company) as
     follows:

          BankBoston, N.A.
          c/o Boston Equiserve Limited Partnership
          150 Royall Street
          Canton, MA  02021
          Attn:  Client Administration

     Notices or demands authorized by this Agreement to be given or made by the
     Company or the Rights Agent to the holder of any Right 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 Distribution Date, the
     Company and the Rights Agent shall, if the Company so directs, supplement
     or amend any provision of this Agreement without the approval of any
     holders of the Rights. From and after the Distribution Date, the Company
     and the Rights Agent shall, if the Company so directs, from time to time
     supplement or amend any provision of this Agreement without the approval of
     any holders of Right Certificates 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, or (iii) change any other
     provisions with respect to the Rights which the Company may deem necessary
     or desirable; provided, however, that no such supplement or amendment shall
     be made which would adversely affect the interests of the holders of Rights
     (other than the interests of an Acquiring Person or its Affiliates or
     Associates). Any supplement or amendment adopted during any period after
     any Person has become an Acquiring Person but prior to the Distribution
     Date shall become null and void unless such supplement or amendment could
     have been adopted by the Company from and after the Distribution Date. Any
     such supplement or amendment shall be evidenced by a writing signed by the
     Company and the Rights Agent. Upon delivery of a certificate from an
     appropriate officer of the Company which states that the proposed
     supplement or amendment is in compliance with the terms of this Section 27,
     the Rights Agent 



                                       36
<PAGE>   40

     shall execute such supplement or amendment unless the Rights Agent shall
     have determined in good faith that such supplement or amendment would
     adversely affect its interest under this Agreement. Prior to the
     Distribution Date, the interests of the holders of Rights shall be deemed
     coincident with the interests of the holders of Common Shares.

SECTION 28. DETERMINATION AND ACTIONS BY THE BOARD OF DIRECTORS, ETC. 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 or any other
     securities of which any Person is the Beneficial Owner, shall be made in
     accordance with the last sentence of Rule 13d-3(d)(1)(i) of the General
     Rules and Regulations under the Exchange Act as in effect on the date of
     this Agreement. The Board of Directors of the Company 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
     as may be necessary or advisable in the administration of this Agreement,
     including without limitation, the right and power to (i) interpret the
     provisions of this Agreement, and (ii) make all determinations deemed
     necessary or advisable for the administration of this Agreement (including
     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 in good
     faith, shall (x) be final, conclusive and binding on the Rights Agent and
     the holders of the Rights, and (y) not subject the Board to any liability
     to the holders of the Rights.

SECTION 29. 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 30. BENEFITS OF THIS AGREEMENT. Nothing in this Agreement shall be
     construed to give to any person or corporation other than the Company, the
     Rights Agent and the registered holders of the Right Certificates (and,
     prior to the Distribution Date, the Common Shares) any legal or equitable
     right, remedy or claim under this Agreement; but this Agreement shall be
     for the sole and exclusive benefit of the Company, the Rights Agent and the
     registered holders of the Right Certificates (and, prior to the
     Distribution Date, the Common Shares).

SECTION 31. SEVERABILITY. If any term, provision, covenant or restriction of
     this Agreement is held by a court of competent jurisdiction or other
     authority to be invalid, void or unenforceable, the remainder of the terms,
     provisions, covenants and restrictions of this Agreement shall remain in
     full force and effect and shall in no way be affected, impaired or
     invalidated.

SECTION 32. GOVERNING LAW. This Agreement and each Right 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.



                                       37
<PAGE>   41

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.



                                       38
<PAGE>   42

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

ATTEST:                                ARADIGM CORPORATION



By: /s/ REID M. RUBSAMEN               By: /s/ RICHARD P. THOMPSON
    --------------------------------       -------------------------------------
    Reid M. Rubsamen                       Richard P. Thompson
    Secretary                              President and Chief Executive Officer



ATTEST:                                BANKBOSTON, N.A.



By: /s/ SIGNATURE                       By: /s/ GEOFFREY D. ANDERSON
    --------------------------------       -------------------------------------
Title: Account Manager                 Title: Director
      ------------------------------         -----------------------------------











                                       39
<PAGE>   43
                         (EXHIBIT A TO RIGHTS AGREEMENT)

                          CERTIFICATE OF DETERMINATION

                                       OF

                  SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                                       OF

                               ARADIGM CORPORATION

                         (Pursuant to Section 401 of the
                       California General Corporation Law)


        The undersigned, Richard P. Thompson and Reid M. Rubsamen hereby certify
that:

        1. They are the duly elected and acting Chief Executive Officer and
President, and Secretary, respectively, of Aradigm Corporation (the
"Corporation"). 

        2. Pursuant to authority given by the Corporation's Articles of
Incorporation, the Board of Directors of the Corporation has duly adopted the
following resolutions at a meeting duly called and held on August 4, 1998:

                RESOLVED, that pursuant to the authority granted to and vested
        in the Board of Directors of the Corporation in accordance with the
        provisions of its Restated Articles of Incorporation, the Board of
        Directors hereby creates a series of Preferred Stock, without par value,
        of the Corporation and hereby states the designation and number of
        shares, and fixes the relative rights, preferences, privileges and
        restrictions thereof (in addition to the provisions set forth in the
        Restated Articles of Incorporation of the Corporation, which are
        applicable to the Preferred Stock of all classes and series), as
        follows:

                Series A Junior Participating Preferred Stock:

                        SECTION 1. DESIGNATION AND AMOUNT. Two Hundred Thirty
        Thousand (230,000) shares of Preferred Stock, without par value, are
        designated "Series A Junior Participating Preferred Stock" with the
        rights, preferences, privileges and restrictions specified herein (the
        "Junior Preferred Stock"). Such number of shares may be increased or
        decreased by resolution of the Board of Directors; 


                                      A-1
<PAGE>   44

        provided, that no decrease shall reduce the number of shares of Junior
        Preferred Stock to a number less than the number of shares then
        outstanding plus the number of shares reserved for issuance upon the
        exercise of outstanding options, rights or warrants or upon the
        conversion of any outstanding securities issued by the Corporation
        convertible into Junior Preferred Stock.

                        SECTION 2. DIVIDENDS AND DISTRIBUTIONS.

                        (A) Subject to the rights of the holders of any shares
        of any series of Preferred Stock (or any similar stock) ranking prior
        and superior to the Junior Preferred Stock with respect to dividends,
        the holders of shares of Junior Preferred Stock, in preference to the
        holders of Common Stock, without par value (the "Common Stock"), of the
        Corporation, and of any other junior 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 first day of March, June, September and December 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 Junior
        Preferred Stock, in an amount per share (rounded to the nearest cent)
        equal to the greater of (a) $l.00 or (b) subject to the provision for
        adjustment hereinafter set forth, 100 times the aggregate per share
        amount of all cash dividends, and 100 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 Junior Preferred Stock. In the
        event the Corporation shall at any time declare or pay any dividend on
        the Common Stock payable in shares of Common Stock, or effect a
        subdivision or combination or consolidation of the outstanding shares of
        Common Stock (by reclassification or otherwise than by payment of a
        dividend in shares of Common Stock) into a greater or lesser number of
        shares of Common Stock, then in each such case the amount to which
        holders of shares of Junior Preferred Stock were entitled immediately
        prior to such event under clause (b) of the preceding sentence shall be
        adjusted by multiplying such amount by a fraction, the numerator of
        which is the number of shares of Common Stock outstanding immediately
        after such event and the denominator of which is the number of shares of
        Common Stock that were outstanding immediately prior to such event.

                        (B) The Corporation shall declare a dividend or
        distribution on the Junior Preferred Stock as provided in paragraph (A)
        of this Section immediately after it declares a dividend or distribution
        on the Common Stock (other than a dividend payable in shares of Common
        Stock); provided that, in the event no dividend or distribution shall
        have been declared on the Common Stock during the period between any
        Quarterly Dividend Payment Date and the next subsequent Quarterly
        Dividend Payment Date, a dividend of $1.00 per share on 


                                      A-2
<PAGE>   45

        the Junior Preferred Stock shall nevertheless be payable on such
        subsequent Quarterly Dividend Payment Date.

                        (C) Dividends shall begin to accrue and be cumulative on
        outstanding shares of Junior Preferred Stock from the Quarterly Dividend
        Payment Date next preceding the date of issue of such shares, 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
        Junior Preferred Stock entitled to receive a quarterly dividend and
        before such Quarterly Dividend Payment Date, in either of which events
        such dividends shall begin to accrue and be cumulative from such
        Quarterly Dividend Payment Date. Accrued but unpaid dividends shall not
        bear interest. Dividends paid on the shares of Junior 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 Junior Preferred Stock entitled to receive payment
        of a dividend or distribution declared thereon, which record date shall
        be not more than 60 days prior to the date fixed for the payment
        thereof.

                        SECTION 3. VOTING RIGHTS. The holders of shares of
        Junior Preferred Stock shall have the following voting rights:

                        (A) Subject to the provision for adjustment hereinafter
        set forth, each share of Junior Preferred Stock shall entitle the holder
        thereof to 100 votes on all matters submitted to a vote of the
        shareholders of the Corporation. In the event the Corporation shall at
        any time declare or pay any dividend on the Common Stock payable in
        shares of Common Stock, or effect a subdivision or combination or
        consolidation of the outstanding shares of Common Stock (by
        reclassification or otherwise than by payment of a dividend in shares of
        Common Stock) into a greater or lesser number of shares of Common Stock,
        then in each such case the number of votes per share to which holders of
        shares of Junior Preferred Stock were entitled immediately prior to such
        event shall be adjusted by multiplying such number by a fraction, the
        numerator of which is the number of shares of Common Stock outstanding
        immediately after such event and the denominator of which is the number
        of shares of Common Stock that were outstanding immediately prior to
        such event.

                        (B) Except as otherwise provided herein, in any other
        Certificate of Determination of Preferences creating a series of
        Preferred Stock or any similar stock, or by law, the holders of shares
        of Junior Preferred Stock and the holders of shares of Common Stock and
        any other capital stock of the Corporation having general voting rights
        shall vote together as one class on all matters submitted to a vote of
        shareholders of the Corporation.

                                      A-3
<PAGE>   46

                        (C) Except as set forth herein, or as otherwise provided
        by law, holders of Junior 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.

                        SECTION 4. CERTAIN RESTRICTIONS.

                        (A) Whenever quarterly dividends or other dividends or
        distributions payable on the Junior Preferred Stock as provided in
        Section 2 are in arrears, thereafter and until all accrued and unpaid
        dividends and distributions, whether or not declared, on shares of
        Junior Preferred Stock outstanding shall have been paid in full, the
        Corporation shall not:

                                (i) declare or pay dividends, or make any other
        distributions, on any shares of stock ranking junior (either as to
        dividends or upon liquidation, dissolution or winding up) to the Junior
        Preferred Stock;

                                (ii) declare or pay dividends, or make any other
        distributions, on any shares of stock ranking on a parity (either as to
        dividends or upon liquidation, dissolution or winding up) with the
        Junior Preferred Stock, except dividends paid ratably on the Junior
        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 junior (either as to
        dividends or upon liquidation, dissolution or winding up) to the Junior
        Preferred Stock, provided that the Corporation may at any time redeem,
        purchase or otherwise acquire shares of any such junior stock in
        exchange for shares of any stock of the Corporation ranking junior
        (either as to dividends or upon dissolution, liquidation or winding up)
        to the Junior Preferred Stock; or

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

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

                                      A-4
<PAGE>   47

                        SECTION 5. REACQUIRED SHARES. Any shares of Junior
        Preferred Stock purchased or otherwise acquired by the Corporation in
        any manner whatsoever shall be retired and cancelled promptly after the
        acquisition thereof. All such shares shall upon their cancellation
        become authorized but unissued shares of Preferred Stock and may be
        reissued as part of a new series of Preferred Stock subject to the
        conditions and restrictions on issuance set forth herein, in the
        Restated Articles of Incorporation, or in any other Certificate of
        Determination of Preferences creating a series of Preferred Stock or any
        similar stock or as otherwise required by law.

                        SECTION 6. LIQUIDATION, DISSOLUTION OR WINDING UP. Upon
        any liquidation, dissolution or winding up of the Corporation, no
        distribution shall be made (1) to the holders of shares of stock ranking
        junior (either as to dividends or upon liquidation, dissolution or
        winding up) to the Junior Preferred Stock unless, prior thereto, the
        holders of shares of Junior Preferred Stock shall have received the
        greater of: (A) $100 per share, plus an amount equal to accrued and
        unpaid dividends and distributions thereon, whether or not declared, to
        the date of such payment; or (B) an aggregate amount per share, subject
        to the provision for adjustment hereinafter set forth, equal to 100
        times the aggregate amount to be distributed per share to holders of
        shares of Common Stock, or (2) to the holders of shares of stock ranking
        on a parity (either as to dividends or upon liquidation, dissolution or
        winding up) with the Junior Preferred Stock, except distributions made
        ratably on the Junior Preferred Stock and all such parity stock in
        proportion to the total amounts to which the holders of all such shares
        are entitled upon such liquidation, dissolution or winding up. In the
        event the Corporation shall at any time declare or pay any dividend on
        the Common Stock payable in shares of Common Stock, or effect a
        subdivision or combination or consolidation of the outstanding shares of
        Common Stock (by reclassification or otherwise than by payment of a
        dividend in shares of Common Stock) into a greater or lesser number of
        shares of Common Stock, then in each such case the aggregate amount to
        which holders of shares of Junior Preferred Stock were entitled
        immediately prior to such event under the proviso in clause (1) of the
        preceding sentence shall be adjusted by multiplying such amount by a
        fraction the numerator of which is the number of shares of Common Stock
        outstanding immediately after such event and the denominator of which is
        the number of shares of Common Stock that were outstanding immediately
        prior to such event.

                        SECTION 7. CONSOLIDATION, MERGER, ETC. In case the
        Corporation shall enter into any consolidation, merger, combination or
        other transaction in which the shares of Common Stock are exchanged for
        or changed into other stock or securities, cash and/or any other
        property, then in any such case each share of Junior Preferred Stock
        shall at the same time be similarly exchanged or changed into an amount
        per share, subject to the provision for adjustment hereinafter set
        forth, equal to 100 times the aggregate amount of stock, securities,
        cash and/or any other property (payable in kind), as the case may be,
        into which or for which each share of Common Stock is changed or
        exchanged. In the event the Corporation shall at any time declare or pay
        any dividend on the Common Stock 


                                      A-5
<PAGE>   48

        payable in shares of Common Stock, or effect a subdivision or
        combination or consolidation of the outstanding shares of Common Stock
        (by reclassification or otherwise than by payment of a dividend in
        shares of Common Stock) into a greater or lesser number of shares of
        Common Stock, then in each such case the amount set forth in the
        preceding sentence with respect to the exchange or change of shares of
        Junior Preferred Stock shall be adjusted by multiplying such amount by a
        fraction, the numerator of which is the number of shares of Common Stock
        outstanding immediately after such event and the denominator of which is
        the number of shares of Common Stock that were outstanding immediately
        prior to such event.

                        SECTION 8. NO REDEMPTION. The shares of Junior Preferred
        Stock shall not be redeemable.

                        SECTION 9. RANK. The Junior Preferred Stock shall rank,
        with respect to the payment of dividends and the distribution of assets,
        junior to all other series of the Corporation's Preferred Stock.

                        SECTION 10. AMENDMENT. The Restated Articles of
        Incorporation of the Corporation shall not be amended in any manner
        which would materially alter or change the powers, preferences or
        special rights of the Junior Preferred Stock so as to affect them
        adversely without the affirmative vote of the holders of at least
        two-thirds of the outstanding shares of Junior Preferred Stock, voting
        together as a single class.

        3. The authorized number of shares of Preferred Stock of this
corporation is 5,000,000, and the number of shares of Preferred Stock
constituting Series A Junior Preferred Stock, none of which has been issued, is
230,000.


                                      A-6
<PAGE>   49

        IN WITNESS WHEREOF, the undersigned have executed this certificate on
August 31, 1998.

                                           /s/ RICHARD P. THOMPSON  
                                           ------------------------------------
                                           RICHARD P. THOMPSON
                                           CHIEF EXECUTIVE OFFICER AND PRESIDENT


                                           /s/ REID M. RUBSAMEN
                                           ------------------------------------
                                           REID M. RUBSAMEN
                                           SECRETARY


        The undersigned Richard P. Thompson, Chief Executive Officer and
President of Aradigm Corporation and Reid M. Rubsamen, Secretary of said
corporation, each certifies under penalty of perjury that the matters set forth
in the foregoing Certificate of Determination are true of their own knowledge.

                Executed at Hayward, California on August 31, 1998.



                                           /s/ RICHARD P. THOMPSON
                                           ------------------------------------
                                           RICHARD P. THOMPSON
                                           CHIEF EXECUTIVE OFFICER AND PRESIDENT





                Executed at Hayward, California on August 31, 1998.



                                           /s/ REID M. RUBSAMEN  
                                           ------------------------------------
                                           REID M. RUBSAMEN
                                           SECRETARY

                                      A-7
<PAGE>   50
                         (EXHIBIT B TO RIGHTS AGREEMENT)


                            FORM OF RIGHT CERTIFICATE



CERTIFICATE NO. R-                                                    ___ RIGHTS


        NOT EXERCISABLE AFTER AUGUST 31, 2008, OR EARLIER IF REDEMPTION OR
        EXCHANGE OCCURS. THE RIGHTS ARE SUBJECT TO REDEMPTION AT $0.001 PER
        RIGHT AND TO EXCHANGE ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT.


                                RIGHT CERTIFICATE

                               ARADIGM CORPORATION


     This certifies that ___________________ or registered assigns, is the
registered owner of the number of Rights set forth above, each of which entitles
the owner thereof, subject to the terms, provisions and conditions of the Rights
Agreement, dated as of August 31, 1998 (the "Rights Agreement"), between Aradigm
Corporation, a California corporation (the "Company"), and BankBoston, N.A. (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.,
Eastern Time, on September 8, 2008 at the office of the Rights Agent designated
for such purpose, or at the office of its successor as Rights Agent, one
one-hundredth of a fully paid non-assessable share of Series A Junior
Participating Preferred Stock (the "Preferred Shares"), of the Company, at a
purchase price of $65 per one one-hundredth of a Preferred Share (the "Purchase
Price"), upon presentation and surrender of this Right Certificate with the Form
of Election to Purchase duly executed. The number of Rights evidenced by this
Right Certificate (and the number of one one-hundredths of a Preferred Share
which may be purchased upon exercise hereof) set forth above, and the Purchase
Price set forth above, are the number and Purchase Price as of
__________________, based on the Preferred Shares as constituted at such date.

     From and after the time any Person becomes an Acquiring Person, (as such
terms are defined in the Rights Agreement), if the Rights evidenced by this
Right Certificate are beneficially owned by (i) an Acquiring Person or an
Affiliate or Associate of any such Acquiring Person (as such terms are defined
in the Rights Agreement), (ii) a transferee of any such Acquiring Person,
Associate or Affiliate who becomes a transferee after the Acquiring Person
becomes such, or (iii) under certain circumstances specified in the Rights
Agreement, a transferee of any such Acquiring Person, Associate or Affiliate who
becomes a transferee prior to or concurrently with the Acquiring Person becoming
such, such Rights shall become null and 



                                      B-1
<PAGE>   51

void without any further action and no holder hereof shall have any right with
respect to such Rights from and after the time any Person becomes an Acquiring
Person.

     As provided in the Rights Agreement, the Purchase Price and the number of
one one-hundredths of a Preferred Share which may be purchased upon the exercise
of the Rights evidenced by this Right Certificate are subject to modification
and adjustment upon the happening of certain events.

     This Right Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, as amended from time to time, 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
Right Certificates. Copies of the Rights Agreement are on file at the principal
executive offices of the Company and the above-mentioned offices of the Rights
Agent.

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

     Subject to the provisions of the Rights Agreement, the Rights evidenced by
this Certificate (i) may be redeemed by the Company at a redemption price of
$0.001 per Right or (ii) may be exchanged in whole or in part for shares of the
Company's Common Stock, no par value per share, or, upon circumstances set forth
in the Rights Agreement, cash, property or other securities of the Company,
including fractions of a share of Preferred Stock.

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

     No holder of this Right Certificate shall be entitled to vote or receive
dividends or be deemed for any purpose the holder of the Preferred Shares or of
any other securities of the 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 Right Certificate shall have been
exercised as provided in the Rights Agreement.


                                       B-2
<PAGE>   52

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

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


ATTEST:                                ARADIGM CORPORATION



- -------------------------------------  -----------------------------------------
[Signing Company Secretary's Name]     [Signing Company Officer's Name]
[Title]                                [Title]



COUNTERSIGNED:


BANKBOSTON, N.A.,
as Rights Agent



By:
   ----------------------------------
   [Authorized Signature]






                                      B-3
<PAGE>   53

                    Form of Reverse Side of Right Certificate


                               FORM OF ASSIGNMENT


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


     FOR VALUE RECEIVED ______________________________________ hereby sells,
assigns and transfers unto

- --------------------------------------------------------------
        (Please print name and address of transferee)

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


Dated:  ____________________



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






             Form of Reverse Side of Right Certificate -- continued




                                      B-4
<PAGE>   54

Signature Guaranteed:

     Signatures must be guaranteed by an "eligible guarantor institution" as
defined in Rule 17Ad-15 promulgated under the Securities Exchange Act of 1934,
as amended.


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

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


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




                                      B-5
<PAGE>   55

                          FORM OF ELECTION TO PURCHASE

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


To __[Rights Agent]__

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

Please insert social security
or other identifying number:
                             ------------------------



- --------------------------------------------------------------------------------
                         (Please print name and address)

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

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

Please insert social security
or other identifying number: 
                             ------------------------


- --------------------------------------------------------------------------------
                         (Please print name and address)

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


Dated:  _________________


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


             Form of Reverse Side of Right Certificate -- continued



                                      B-6
<PAGE>   56

Signature Guaranteed:

     Signatures must be guaranteed by an "eligible guarantor institution" as
defined in Rule 17Ad-15 promulgated under the Securities Exchange Act of 1934,
as amended.


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

     The undersigned hereby certifies that (1) the Rights evidenced by this
Right Certificate are not beneficially owned by nor are they being exercised on
behalf of an Acquiring Person, an Interested Shareholder or an Affiliate or
Associate thereof (as such terms are defined in the Rights Agreement); and (2)
after due inquiry and to the best of the knowledge of the undersigned, the
undersigned did not acquire the Rights evidenced by this Right Certificate from
any Person who is or was an Acquiring Person, an Interested Shareholder, or an
Affiliate or Associate thereof.



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

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


                                     NOTICE

     The signature in the Form of Assignment or Form of Election to Purchase, as
the case may be, must conform to the name as written upon the face of this Right
Certificate in every particular, without alteration or enlargement or any change
whatsoever.

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







                                      B-7
<PAGE>   57

                         (EXHIBIT C TO RIGHTS AGREEMENT)

                               ARADIGM CORPORATION

                          SUMMARY OF RIGHTS TO PURCHASE
                                PREFERRED SHARES


               On August 4, 1998, the Board of Directors of ARADIGM CORPORATION
(the "Company") declared a dividend of one preferred share purchase right (a
"Right") for each outstanding share of common stock, without par value per
share, (the "Common Shares") of the Company. The dividend is effective as of
September 8, 1998 (the "Record Date") with respect to the shareholders of record
on that date. The Rights will also attach to new Common Shares issued after the
Record Date. Each Right entitles the registered holder to purchase from the
Company one one-hundredth of a share of Series A Junior Participating Preferred
Stock, without par value per share, (the "Preferred Shares") of the Company at a
price of $65 per one one-hundredth of a Preferred Share (the "Purchase Price"),
subject to adjustment. Each Preferred Share is designed to be the economic
equivalent of 100 Common Shares. The description and terms of the Rights are set
forth in a Rights Agreement dated as of August 31, 1998 (the "Rights
Agreement"), between the Company and BankBoston, N.A. (the "Rights Agent").

DETACHMENT AND TRANSFER OF RIGHTS

               Initially, the Rights will be evidenced by the stock certificates
representing Common Shares then outstanding, and no separate Right Certificates
will be distributed. Until the earlier to occur of (i) a public announcement
that a person or group of affiliated or associated persons, has become an
"Acquiring Person" (as such term is defined in the Rights Agreement) or (ii) 10
business days (or such later date as the Board may determine) following the
commencement of, or announcement of an intention to make, a tender offer or
exchange offer which would result in the beneficial ownership by an Acquiring
Person of 15% or more of the outstanding Common Shares (the earlier of such
dates being called the "Distribution Date"), the Rights will be evidenced, with
respect to any of the Common Share certificates outstanding as of the Record
Date, by such Common Share certificate. In general, an "Acquiring Person" is a
person, the affiliates or associates of such person, or a group, which has
acquired beneficial ownership of 15% or more of the outstanding Common Shares.

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


<PAGE>   58

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 Right
Certificates alone will evidence the Rights.

EXERCISABILITY OF RIGHTS

               The Rights are not exercisable until the Distribution Date.  The 
Rights will expire on September 8, 2008 (the "Final Expiration Date"), unless
the Final Expiration Date is extended or unless the Rights are earlier redeemed
or exchanged by the Company, in each case as described below. Until a Right is
exercised, the holder thereof, as such, will have no rights as a shareholder of
the Company, including, without limitation, the right to vote or to receive
dividends.

               The Purchase Price payable, and the number of Preferred Shares or
other securities or property issuable or payable, upon exercise of the Rights
are subject to adjustment from time to time to prevent dilution. The number of
outstanding Rights and the number of one one-hundredths of a Preferred Share
issuable upon exercise of each Right are also subject to adjustment in the event
of a stock split of the Common Shares or a stock dividend on the Common Shares
payable in Common Shares, or subdivisions, consolidations or combinations of the
Common Shares occurring, in any such case, prior to the Distribution Date. With
certain exceptions, no adjustment in the Purchase Price will be required until
cumulative adjustments require an adjustment of at least 1% in such Purchase
Price. No fractional Preferred Shares will be issued (other than fractions which
are integral multiples of one one-hundredth of a Preferred Share, which may, at
the election of the Company, be evidenced by depositary receipts) and in lieu
thereof, an adjustment in cash will be made based on the market price of the
Preferred Shares on the last trading day prior to the date of exercise.

TERMS OF PREFERRED SHARES

               Preferred Shares purchasable upon exercise of the Rights will not
be redeemable. Each Preferred Share will be entitled to a minimum preferential
quarterly dividend payment of $l per share but will be entitled to an aggregate
dividend of 100 times the dividend declared per Common Share. In the event of
liquidation, the holders of the Preferred Shares will be entitled to a minimum
preferential liquidation payment of $100 per share but will be entitled to an
aggregate payment of 100 times the payment made per Common Share. Each Preferred
Share will have 100 votes, voting together with the Common Shares. Finally, in
the event of any merger, consolidation or other transaction in which Common
Shares are exchanged, each Preferred Share will be entitled to receive 100 times
the amount received per Common Share. These rights are protected by customary
anti-dilution provisions. Because of the nature of the Preferred Shares'
dividend, liquidation and voting rights, the value of the one one-hundredth
interest in a Preferred Share purchasable upon exercise of each Right should
approximate the value of one Common Share. The Preferred Shares would rank
junior to any other series of the Company's preferred stock.

<PAGE>   59
TRIGGER OF FLIP-IN AND FLIP-OVER RIGHTS

               In the event that any person or group of affiliated or associated
persons becomes an Acquiring Person, proper provision shall be made so that each
holder of a Right, other than Rights beneficially owned by the Acquiring Person
or any affiliate or associate thereof (which will thereafter be void), will
thereafter have the right to receive upon exercise that number of Common Shares
having a market value of two times the exercise price of the Right. This right
will commence on the date of public announcement that a person has become an
Acquiring Person (or the effective date of a registration statement relating to
distribution of the rights, if later) and terminate 60 days later (subject to
adjustment in the event exercise of the rights is enjoined).

               In the event that the Company is acquired in a merger or other
business combination transaction or 50% or more of its consolidated assets or
earning power are sold to an Acquiring Person, its affiliates or associates or
certain other persons in which such persons have an interest, proper provision
will be made so that each such holder of a Right will thereafter have the right
to receive, upon the exercise thereof at the then current exercise price of the
Right, that number of shares of common stock of the acquiring company which at
the time of such transaction will have a market value of two times the exercise
price of the Right.

REDEMPTION AND EXCHANGE OF RIGHTS

               At any time prior to the earliest of (i) the close of business on
the day of the first public announcement that a person has become an Acquiring
Person, or (ii) the Final Expiration Date, the Board of Directors of the Company
may redeem the Rights in whole, but not in part, at a price of $.001 per Right
(the "Redemption Price"). In general, the redemption of the Rights may be made
effective at such time on such basis with such conditions as the Board of
Directors in its sole discretion may establish. Immediately upon any redemption
of the Rights, the right to exercise the Rights will terminate and the only
right of the holders of Rights will be to receive the Redemption Price.

               At any time after any Person becomes an Acquiring Person and
prior to the acquisition by such person or group of 50% or more of the
outstanding Common Shares, the Board of Directors of the Company may exchange
the Rights (other than Rights owned by such person or group which will have
become void), in whole or in part, at an exchange ratio of one Common Share, or,
under circumstances set forth in the Rights Agreement, cash, property or other
securities of the Company, including fractions of a Preferred Share (or of a
share of a class or series of the Company's preferred stock having equivalent
designations and the powers, preferences and rights, and the qualifications,
limitations and restrictions), per Right (with value equal to such Common
Shares).


<PAGE>   60

AMENDMENT OF RIGHTS

               The terms of the Rights generally may be amended by the Board of
Directors of the Company without the consent of the holders of the Rights,
except that from and after such time as the Rights are distributed no such
amendment may adversely affect the interests of the holders of the Rights
(excluding the interest of any Acquiring Person).

ADDITIONAL INFORMATION

               A copy of the Rights Agreement has been filed with the Securities
and Exchange Commission as an Exhibit to a Current Report on Form 8-K dated
September 2, 1998. A copy of the Rights Agreement is available from the Company
by writing to: Mark A. Olbert, Aradigm Corporation, 26219 Eden Landing Road,
Hayward, CA 94545. This summary description of the Rights is not intended to be
complete and is qualified in its entirety by reference to the Rights Agreement,
which is hereby incorporated herein by reference.






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