NEORX CORP
8-A12G, 1996-04-16
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                                    FORM 8-A

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

                    PURSUANT TO SECTION 12(b) OR 12(g) OF THE

                         SECURITIES EXCHANGE ACT OF 1934

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

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

              Washington                                         91-1261311
- ----------------------------------------                     -------------------
(State of incorporation or organization)                      (I.R.S. employer
                                                             identification no.)

        410 West Harrison Street
          Seattle, Washington                                      98119
- ----------------------------------------                     -------------------
(Address of principal executive offices)                         (zip code)
 
If this Form relates to the             If this Form relates to the
registration of a class of debt         registration of a class of debt
securities and is effective upon        securities and is to become effective
filing pursuant to General              simultaneously with the
Instruction A(c)(1) please              effectiveness of a concurrent
check the following box. / /            registration statement under the
                                        Securitites Act of 1933 pursuant to
                                        General Instruction A(c)(2) please
                                        check the following box. / /

SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

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

              None

SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

                         Preferred Stock Purchase Rights

                                (Title of class)

                                      -1-
<PAGE>   2
ITEM 1. DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED

     Board Action. On April 10, 1996, the Board of Directors (the "Board of
Directors") of NeoRx Corporation (the "Company") declared a dividend of one
preferred share purchase right (a "Right") for each outstanding share of common
stock, par value $.02 per share (the "Common Shares"), of the Company. The
dividend is payable on April 19, 1996 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, par value $.02 per share (the "Preferred Shares"), of the Company at a
price of $40.00 per one one-hundredth of a Preferred Share (the "Purchase
Price"), subject to adjustment. The description and terms of the Rights are set
forth in a Rights Agreement (the "Rights Agreement") between the Company and
First Interstate Bank, N.A., as Rights Agent. 

     Triggering Events. Until the earlier to occur of (i) 10 days following a
public announcement that a person or group of affiliated or associated persons
(an "Acquiring Person") has acquired beneficial ownership of 20% or more of the
outstanding Common Shares and (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 group of affiliated persons becomes an Acquiring Person) following the
commencement of, or announcement of an intention to make, a tender offer or
exchange offer the consummation of which would result in the beneficial
ownership by a person or group of 20% or more of the outstanding Common Shares
(the earlier of such dates being called the "Distribution Date"), the Rights
will be evidenced by Common Share certificates.

     Rights Are Attached to Common Stock. The Rights Agreement provides that,
until the Distribution Date (or earlier redemption or expiration of the Rights),
the Rights will be transferred with and only with the Common Shares. Until the
Distribution Date (or earlier redemption or expiration of the Rights), the
surrender for transfer of any certificates for Common Shares 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
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.

     The Rights are not exercisable until the Distribution Date. The Rights will
expire on April 10, 2006 (the "Final Expiration Date"), unless the Final
Expiration 

                                                                          PAGE 1
<PAGE>   3
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.

     Exercise of Rights. In the event any person becomes an Acquiring Person,
each holder of a Right shall thereafter 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 the Rights Agreement and in lieu of
Preferred Shares, such number of Common Shares of the Company 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 Company's Common Shares.

     If after a person or group has become an Acquiring Person 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, 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 Purchase Price of the Right, that
number of shares of common stock of the acquiring company that at the time of
such transaction will have a market value of two times the Purchase Price of the
Right. If 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 (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 Purchase
Price of the Right.

     At any time after any person or group 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 may exchange the Rights (other than Rights
owned by such person or group that will 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 (subject to adjustment).

     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 $1 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 

                                                                          PAGE 2
<PAGE>   4
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
antidilution 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.

     Redemption of Rights. At any time prior to the acquisition by a person or
group of affiliated or associated persons of beneficial ownership of 20% or more
of the outstanding Common Shares, the Board of Directors may redeem the Rights
in whole, but not in part, at a price of $.001 per Right (the "Redemption
Price"). 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.

     Amendment of Rights. The terms of the Rights may be amended by the Board of
Directors without the consent of the holders of the Rights, including an
amendment to lower certain thresholds described above to not less than the
greater of (i) the sum of .001% and the largest percentage of the outstanding
Common Shares then known to the Company to be beneficially owned by any person
or group of affiliated or associated persons and (ii) 10%, except that, from and
after such time as any person or group of affiliated or associated persons
becomes an Acquiring Person, no such amendment may adversely affect the
interests of the holders of the Rights.

     As of April 10, 1996, there were approximately 15,349,647 Common Shares
outstanding. Each Common Share outstanding at the close of business on 
April 19, 1996, will receive one Right. The Board of Directors of the Company 
has reserved sufficient Preferred Shares for issuance upon exercise of the 
Rights.

     The Rights have certain antitakeover effects. The Rights will cause
substantial dilution to a person or group that attempts to acquire the Company
on terms not approved by the Board of Directors. The Rights should not affect
any prospective offeror willing to make an all-cash offer at a full and fair
price, or willing to negotiate with the Board of Directors. The Rights will 
not interfere with any merger or other business combination approved by the 
Board of Directors.

                                                                          PAGE 3
<PAGE>   5
     A copy of the Rights Agreement is attached as Exhibit 2.1 hereto. A copy of
the Rights Agreement is available free of charge from the Company. This summary
description of the Rights does not purport to be complete and is qualified in
its entirety by reference to the Rights Agreement, which is hereby incorporated
herein by reference.

ITEM 2. EXHIBITS

        1.1  Form of Right Certificate, incorporated by reference to Exhibit B
             to Exhibit 2.1 filed herewith.

        2.1  Rights Agreement dated as of April 10, 1996, between NeoRx
             Corporation and First Interstate Bank of Washington, N.A.

                                                                          PAGE 4
<PAGE>   6
                                    SIGNATURE

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

     Date: April 15, 1996

                                                 NEORX CORPORATION


                                                 By /s/ ROBERT M. LITTAUER
                                                    ----------------------------
                                                    Robert M. Littauer
                                                    Senior Vice President

                                                                          PAGE 5
<PAGE>   7
                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
Exhibit Number    Description                                       
- --------------    -----------                                      
<S>               <C>                                             
     1.1          Form of Right Certificate, incorporated by
                  reference to Exhibit B to Exhibit 2.1
                  filed herewith

     2.1          Rights Agreement dated as of April 10,
                  1996, between NeoRx Corporation and First
                  Interstate Bank of Washington, N.A., as
                  rights agent.
</TABLE>

                                                                         PAGE 6

<PAGE>   1
                                                                     EXHIBIT 2.1


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

                                RIGHTS AGREEMENT


                                     BETWEEN


                                NEORX CORPORATION

                                       AND

                              FIRST INTERSTATE BANK
                              OF WASHINGTON, N.A.,
                                  RIGHTS AGENT


                           DATED AS OF APRIL 10, 1996

- --------------------------------------------------------------------------------
<PAGE>   2
                                TABLE OF CONTENTS

<TABLE>
<S>                                                                              <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 .................................    6
Section 6. Transfer, Split Up, Combination and Exchange of Right Certificates;
              Mutilated, Destroyed, Lost or Stolen Right Certificates ........    7
Section 7. Exercise of Rights; Purchase Price; Expiration Date of Rights .....    8
Section 8. Cancellation and Destruction of Right Certificates ................    9
Section 9. Availability of Preferred Shares ..................................    9
Section 10. Preferred Shares Record Date .....................................   10
Section 11. Adjustment of Purchase Price, Number of Shares or Number of
              Rights .........................................................   10
Section 12. Certificate of Adjusted Purchase Price or Number of Shares .......   17
Section 13. Consolidation, Merger or Sale or Transfer of Assets or Earning
              Power ..........................................................   17
Section 14. Fractional Rights and Fractional Shares ..........................   18
Section 15. Rights of Action .................................................   20
Section 16. Agreement of Right Holders .......................................   20
Section 17. Right Certificate Holder Not Deemed a Shareholder ................   21
Section 18. Concerning the Rights Agent ......................................   21
Section 19. Merger or Consolidation or Change of Name of Rights Agent ........   22
</TABLE>
<PAGE>   3
<TABLE>
<S>                                                                              <C>
Section 20. Duties of Rights Agent ...........................................   22
Section 21. Change of Rights Agent ...........................................   24
Section 22. Issuance of New Right Certificates ...............................   25
Section 23. Redemption .......................................................   25
Section 24. Exchange .........................................................   26
Section 25. Notice of Certain Events .........................................   27
Section 26. Notices ..........................................................   28
Section 27. Supplements and Amendments .......................................   29
Section 28. Successors .......................................................   30
Section 29. Benefits of This Agreement .......................................   30
Section 30. Severability .....................................................   30
Section 31. Governing Law ....................................................   30
Section 32. Counterparts .....................................................   30
Section 33. Descriptive Headings .............................................   30

Exhibit A -   Form of Articles of Amendment--Rights and Preferences of Series A
              Junior Participating Preferred Stock

Exhibit B -   Form of Right Certificate

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

                                       ii
<PAGE>   4
                                RIGHTS AGREEMENT


     Agreement, dated as of April 10, 1996, between NeoRx Corporation, a
Washington corporation (the "Company"), and First Interstate Bank of Washington,
N.A. (the "Rights Agent").

     The Board of Directors of the Company ("Board of Directors") has authorized
and declared a dividend of one preferred share purchase right (a "Right") for
each Common Share (as hereinafter defined) of the Company outstanding on April
19, 1996 (the "Record Date"), each Right representing the right to purchase one
one-hundredth of a Preferred Share (as hereinafter defined), upon the terms and
subject to the conditions herein set forth, and has further authorized and
directed the issuance of one Right with respect to each Common Share that shall
become outstanding between the Record Date and the earliest of the Distribution
Date, the Redemption Date and the Final Expiration Date (as such terms are
hereinafter defined).

     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 20% or more of the Common Shares of the
Company then outstanding, but shall not include the Company, any Subsidiary (as
such term is hereinafter defined) of the Company, any employee benefit plan of
the Company or any Subsidiary of the Company, or any entity holding Common
Shares for or pursuant to the terms of any such plan. Notwithstanding the
foregoing, no Person shall become an "Acquiring Person" as the result of an
acquisition of Common Shares by the Company which, by reducing the number of
shares outstanding, increases the proportionate number of shares beneficially
owned by such Person to 20% or more of the Common Shares of the Company then
outstanding; provided, however, that if a Person shall become the Beneficial
Owner of 20% or more of the Common Shares of the Company then outstanding by
reason of share purchases by the Company and shall, after such share purchases
by the Company, become the Beneficial Owner of any additional Common Shares of
the Company, then such Person shall be deemed to be an "Acquiring Person."
Notwithstanding the foregoing, if the Board of Directors
<PAGE>   5
determines in good faith that a Person who would otherwise be an "Acquiring
Person," as defined pursuant to the foregoing provisions of this paragraph (a),
has become such inadvertently, and such Person divests as promptly as
practicable a sufficient number of Common Shares so that such Person would no
longer be an "Acquiring Person," as defined pursuant to the foregoing provisions
of this paragraph (a), then such Person shall not be deemed to be 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.

         (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 beneficially owns, directly or indirectly;

         (ii)  which such Person or any of such Person's Affiliates or 
     Associates has (A) the right to acquire (whether such right is exercisable
     immediately or only after the passage of time) pursuant to any agreement,
     arrangement or understanding (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

         (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 

                                      -2-
<PAGE>   6
     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)) 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 State of Washington 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., Seattle
time, on such date; provided, however, that if such date is not a Business Day
it shall mean 5:00 p.m., Seattle time, on the next succeeding Business Day.

         (f) "Common Shares" when used with reference to the Company shall mean
the shares of common stock, par value $.02 per share, of the Company. "Common
Shares" when used with reference to any Person other than the Company shall mean
the capital stock (or equity interest) with the greatest voting power of such
other Person or, if such other Person is a Subsidiary of another Person, the
Person or Persons that 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) "Person" shall mean any individual, firm, corporation or other
entity, and shall include any successor (by merger or otherwise) of such entity.

         (j) "Preferred Shares" shall mean shares of Series A Junior
Participating Preferred Stock, par value $.02 per share, of the Company having
the rights and preferences set forth in the Rights and Preferences of Series A
Junior Participating Preferred Stock attached as Exhibit A hereto.

                                      -3-
<PAGE>   7
         (k) "Redemption Date" shall have the meaning set forth in Section 7
hereof.

         (l) "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.

         (m) "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.

SECTION 2. APPOINTMENT OF RIGHTS AGENT

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

SECTION 3. ISSUE OF RIGHT CERTIFICATES

         (a) Until the earlier of (i) the 10th day after the Shares Acquisition
Date and (ii) the 10th business day (or such later date as may be determined by
action of the Board of Directors before such time as any Person becomes an
Acquiring Person) after the date of the commencement 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 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 the
consummation of which would result in any Person becoming the Beneficial Owner
of Common Shares aggregating 20% or more of the then outstanding Common Shares
(including any such date that is after the date of this Agreement and before the
issuance of the Rights; the earlier of such dates being herein referred to as
the "Distribution Date"), (A) the Rights will be evidenced (subject to the
provisions of Section 3(b) hereof) by the certificates for Common Shares
registered in the names of the holders thereof (which certificates shall also be
deemed to be Right Certificates as hereinafter defined) and not by separate
Right Certificates and (B) the right to receive Right Certificates will be
transferable only in connection with the transfer of Common Shares. As soon as
practicable after the 

                                      -4-
<PAGE>   8
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
appropriate adjustments, as hereinafter defined). 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 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
together with a copy of the Summary of Rights attached thereto. Until the
Distribution Date (and the earlier of the Redemption Date or the Final
Expiration Date), the surrender for transfer of any certificate for Common
Shares outstanding on the Record Date, with or without a copy of the Summary of
Rights attached thereto, shall also constitute the transfer of the Rights
associated with the Common Shares represented thereby.

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

         This certificate also evidences and entitles the holder hereof to
         certain rights as set forth in a Rights Agreement between NeoRx
         Corporation and First Interstate Bank of Washington, N.A., dated as of
         April 10, 1996 (the "Rights Agreement"), the terms of which are hereby
         incorporated herein by reference and a copy of which is on file at the
         principal executive offices of NeoRx Corporation. 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. NeoRx Corporation will mail to the holder of this
         certificate a 

                                      -5-
<PAGE>   9
         copy of the Rights Agreement without charge after receipt of a written
         request therefor. Under certain circumstances, as set forth in the
         Rights Agreement, Rights issued to any Person who becomes an Acquiring
         Person (as defined in the Rights Agreement) may become null and void.

With respect to such certificates containing the foregoing legend, until the
Distribution Date, the Rights associated with the Common Shares represented by
such certificates shall be evidenced by such certificates alone, and the
surrender for transfer of any such certificate shall also constitute the
transfer of the Rights associated with the Common Shares represented thereby. If
the Company purchases or acquires any Common Shares after the Record Date but
before the Distribution Date, any Rights associated with such Common Shares
shall be deemed cancelled and retired so that the Company shall not be entitled
to exercise any Rights associated with the Common Shares which are no longer
outstanding.

SECTION 4. FORM OF RIGHT CERTIFICATES

     The Right Certificates (and the forms of election to purchase Preferred
Shares and of assignment 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 Section 22
hereof, the Right Certificates shall entitle the holders thereof to purchase
such number of one one-hundredths of a Preferred 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.

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, any of its
Senior Vice Presidents or Vice Presidents, or its Treasurer, 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 

                                      -6-
<PAGE>   10
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 principal office, 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.

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

     Subject to the provisions of Section 14 hereof, at any time after the close
of business on the Distribution Date, and at or before the close of business on
the earlier of the Redemption Date or the Final Expiration Date, any Right
Certificate or Right Certificates (other than Right Certificates representing
Rights that have become void pursuant to Section 11(a)(ii) hereof or that have
been exchanged pursuant to Section 24 hereof) 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 principal office of the
Rights Agent. Thereupon the Rights Agent shall 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 

                                      -7-
<PAGE>   11
and the Rights Agent of all reasonable expenses incidental thereto, and upon
surrender to the Rights Agent and cancellation of the Right Certificate if
mutilated, the Company will make and deliver a new Right Certificate of like
tenor to the Rights Agent for delivery to the registered holder in lieu of the
Right Certificate so lost, stolen, destroyed or mutilated.

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

         (a) 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 principal office of the Rights Agent,
together with payment of the Purchase Price for each one one-hundredth of a
Preferred Share as to which the Rights are exercised, at or prior to the
earliest of (i) the close of business on April 10, 2006 (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 for each one one-hundredth of a Preferred Share
purchasable pursuant to the exercise of a Right shall initially be $40.00 and
shall be subject to adjustment from time to time as provided in Section 11 or 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 or money order payable to the order of the Company, the Rights Agent shall
thereupon promptly (i) (A) requisition from any transfer agent of the Preferred
Shares certificates for the number of Preferred Shares to be purchased and the
Company hereby irrevocably authorizes its transfer agent to comply with all such
requests, or (B) requisition from the depositary agent depositary receipts
representing such number of one one-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 

                                      -8-
<PAGE>   12
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.

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

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 cancelled
form, or, if surrendered to the Rights Agent, shall be cancelled by it, and no
Right Certificates shall be issued in lieu thereof except as expressly permitted
by any of the provisions of this 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 cancelled Right Certificates to the Company, or shall, at the written
request of the Company, destroy such cancelled 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 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 Section 7 hereof. The Company covenants
and agrees that it will take all such action as may be necessary to ensure that
all Preferred Shares delivered upon exercise 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.

     The Company further covenants and agrees that it will pay when due and
payable any and all federal and state transfer taxes and charges that 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 that 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 

                                      -9-
<PAGE>   13
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.

SECTION 10. PREFERRED SHARES RECORD DATE

     Each person in whose name any certificate for Preferred Shares is issued
upon the exercise of Rights shall for all purposes be deemed to have become the
holder of record of the Preferred Shares represented thereby on, and such
certificate shall be dated, the date upon which the Right Certificate evidencing
such Rights was duly surrendered and payment of the Purchase Price (and any
applicable transfer taxes) was made; provided, however, that if the date of such
surrender and payment is a date upon which the Preferred Shares transfer books
of the Company are closed, such person shall be deemed to have become the record
holder of such shares on, and such certificate shall be dated, the next
succeeding Business Day on which the Preferred Shares transfer books of the
Company are open. Prior to the exercise of the Rights evidenced thereby, the
holder of a Right Certificate 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 


                                      -10-
<PAGE>   14
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, he or she 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.

             (ii) Subject to Section 24 hereof, in the event any Person becomes
an Acquiring Person, each holder of a Right shall thereafter 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 of the
Company 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 Company's Common Shares (determined
pursuant to Section 11(d) hereof) on the date of the occurrence of such event.
If any Person shall become an Acquiring Person and the Rights shall then be
outstanding, the Company shall not take any action that would eliminate or
diminish the benefits intended to be afforded by the Rights.

     From and after the occurrence of such event, any Rights that are or were
acquired or beneficially owned by any Acquiring Person (or any Associate or
Affiliate of such Acquiring Person) shall be void and any holder of such Rights
shall thereafter have no right to exercise such Rights under any provision of
this Agreement. No Right Certificate shall be issued pursuant to Section 3
hereof that represents Rights beneficially owned by an Acquiring Person whose
Rights would be void pursuant to the preceding sentence or any Associate or
Affiliate thereof; 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
cancelled.

             (iii) If there shall not be sufficient Common Shares issued but not
outstanding or authorized but unissued 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 additional Common Shares
for issuance upon 

                                      -11-
<PAGE>   15
exercise of the Rights. In the event the Company shall, after good faith effort,
be unable to take all such action as may be necessary to authorize such
additional Common Shares, the Company shall substitute, for each Common Share
that would otherwise be issuable upon exercise of a Right, a number of Preferred
Shares or fraction thereof such that the current per share market price of one
Preferred Share multiplied by such number or fraction is equal to the current
per share market price of one Common Share as of the date of issuance of such
Preferred Shares or fraction thereof.

         (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 period expiring within 45 calendar days after such record date) to
subscribe for or purchase Preferred Shares (or shares having the same rights,
privileges and preferences as the Preferred Shares ("equivalent preferred
shares")) or securities convertible into Preferred Shares or equivalent
preferred shares at a price per Preferred Share or equivalent preferred share
(or having 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 defined in Section 11(d)) hereof
on such record date, the Purchase Price to be in effect after such record date
shall be determined by multiplying the Purchase Price in effect immediately
prior to such record date by a fraction the numerator of which shall be the
number of Preferred Shares outstanding on such record date plus the number of
Preferred Shares that 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, 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
if such rights, options or warrants are not so issued, the Purchase Price shall
be adjusted to be the Purchase Price that would then be in effect if such record
date had not been fixed.

                                      -12-
<PAGE>   16
         (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 on such
record date, less the fair market value (as determined in good faith by the
Board of Directors, 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 if 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 if the current per share market price of the Security is
determined during a period following the announcement by the issuer of such
Security of (A) a dividend or distribution on such Security payable in shares of
such Security or securities convertible into such shares or (B) any subdivision,
combination or reclassification of such Security and prior to the expiration of
30 Trading Days after 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 

                                      -13-
<PAGE>   17
reporting system with respect to securities listed on the principal national
securities exchange on which the Security is listed or admitted to trading or,
if the Security is not listed or admitted to trading on any national securities
exchange, the last quoted price or, if not so quoted, the average of the high
bid and low asked prices in the over-the-counter market, as reported by the
National Association of Securities Dealers, Inc. Automated Quotations System
("Nasdaq") or such other system then in use, or, if on any such date the
Security is not quoted by any such organization, the average of the closing bid
and asked prices as furnished by a professional market maker making a market in
the Security selected by the Board of Directors. 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, 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 that 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-millionth 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 and (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 

                                      -14-
<PAGE>   18
to adjustment from time to time in a manner and on terms as nearly equivalent as
practicable to the provisions with respect to the Preferred Shares contained in
Section 11(a) through (c) hereof, inclusive, and the provisions of Sections 7,
9, 10 and 13 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 Sections 11(b) and (c), each Right outstanding
immediately prior to the making of such adjustment shall thereafter evidence the
right to purchase, at the adjusted Purchase Price, that number of one
one-hundredths of a Preferred Share (calculated to the nearest one one-millionth
of a Preferred Share) obtained by (i) multiplying (A) the number of one
one-hundredths of a share covered by a Right immediately prior to this
adjustment by (B) the Purchase Price in effect immediately prior to such
adjustment of the Purchase Price and (ii) dividing the product so obtained by
the Purchase Price in effect immediately after such adjustment of the Purchase
Price.

         (i) The 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 

                                      -15-
<PAGE>   19
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 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 that 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 that 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 over and above 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) 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 

                                      -16-
<PAGE>   20
at less than the current market 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) hereof, hereafter made by the Company to holders of its Preferred Shares
shall not be taxable to such shareholders.

         (n) If 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 that each Common Share outstanding immediately prior to such event had
issued with respect to it. The adjustments provided for in this Section 11(n)
shall be made successively whenever such a dividend is declared or paid or such
a subdivision, combination or consolidation is effected.

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

         Whenever an adjustment is made as provided in Section 11 or 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.

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

         In the event, directly or indirectly, at any time after a Person has
become an Acquiring Person, (a) the Company shall consolidate with, or merge
with and into, any other Person, (b) any Person shall consolidate with the
Company, or merge with and into the Company and the Company shall be the
continuing or surviving corporation of such merger and, in connection with such
merger, all or part of the 

                                      -17-
<PAGE>   21
Common Shares shall be changed into or exchanged for stock or other securities
of any other Person (or the Company) or cash or any other property, or (c) the
Company shall sell or otherwise transfer (or one or more of its Subsidiaries
shall sell or otherwise transfer), in one or more transactions, assets or
earning power aggregating 50% or more of the assets or earning power of the
Company and its Subsidiaries (taken as a whole) to any other Person other than
the Company or one or more of its wholly owned Subsidiaries, then, and in each
such case, proper provision shall be made so that (i) each holder of a Right
(except as otherwise provided herein) shall thereafter 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 Common Shares of such
other Person (including the Company as successor thereto or as the surviving
corporation) 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 of such other
Person (determined pursuant to Section 11(d) hereof) on the date of consummation
of such consolidation, merger, sale or transfer; (ii) the issuer of such Common
Shares 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 issuer; and (iv) such issuer shall take such steps
(including, but not limited to, the reservation of a sufficient number of its
Common Shares) in connection with such consummation as may be necessary to
ensure that the provisions hereof shall thereafter be applicable, as nearly as
reasonably may be, in relation to the Common Shares thereafter deliverable upon
the exercise of the Rights. The Company shall not consummate any such
consolidation, merger, sale or transfer unless prior thereto the Company and
such issuer shall have executed and delivered to the Rights Agent a supplemental
agreement so providing. The Company shall not enter into any transaction of the
kind referred to in this Section 13 if at the time of such transaction there are
any rights, warrants, instruments or securities outstanding or any agreements or
arrangements that, as a result of the consummation of such transaction, would
eliminate or substantially diminish the benefits intended to be afforded by the
Rights. The provisions of this Section 13 shall similarly apply to successive
mergers or consolidations or sales or other transfers.

SECTION 14. FRACTIONAL RIGHTS AND FRACTIONAL SHARES

         (a) The Company shall not be required to issue fractions of Rights or
to distribute Right Certificates that evidence fractional Rights. In lieu of
such

                                      -18-
<PAGE>   22
fractional Rights, there shall be paid to the registered holders of the Right
Certificates with regard to which such fractional Rights would otherwise be
issuable, an amount in cash equal to the same fraction of the current market
value of a whole Right. For the purposes of this Section 14(a), the current
market value of a whole Right shall be the closing price of the Rights for the
Trading Day immediately prior to the date on which such fractional Rights would
have been otherwise issuable. The closing price for any day shall be the last
sale price, regular way, or, in case no such sale takes place on such day, the
average of the closing bid and asked prices, regular way, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities listed or admitted to trading on the New York Stock Exchange or,
if the Rights are not listed or admitted to trading on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting system
with respect to securities listed on the principal national securities exchange
on which the Rights are listed or admitted to trading or, if the Rights are not
listed or admitted to trading on any national securities exchange, the last
quoted price or, if not so quoted, the average of the high bid and low asked
prices in the over-the-counter market, as reported by Nasdaq or such other
system then in use or, if on any such date the Rights are not quoted by any such
organization, the average of the closing bid and asked prices as furnished by a
professional market maker making a market in the Rights selected by the Board of
Directors. 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 shall be used.

         (b) The Company shall not be required to issue fractions of Preferred
Shares (other than fractions that are integral multiples of one one-hundredth of
a Preferred Share) upon exercise of the Rights or to distribute certificates
that evidence fractional Preferred Shares (other than fractions that 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,
pursuant to an appropriate agreement between the Company and a depositary
selected by it; provided, however, that such agreement shall provide that the
holders of such depositary receipts shall have all the rights, privileges and
preferences to which they are entitled as beneficial owners of the Preferred
Shares represented by such depositary receipts. In lieu of fractional Preferred
Shares that are not integral multiples of one one-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 to
the same fraction of the current market value of one Preferred Share. For the
purposes of this Section 14(b), the current market value of a Preferred Share
shall be the closing price of a Preferred Share (as determined pursuant to the
second sentence of 

                                      -19-
<PAGE>   23
Section 11(d)(i) hereof) for the Trading Day immediately prior to the date of
such exercise.

         (c) The holder of a Right by the acceptance of the Right expressly
waives his or her right to receive any fractional Rights or any fractional
shares 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 Section 18 hereof, are vested in the
respective registered holders of the Right Certificates (and, prior to the
Distribution Date, the registered holders of the Common Shares); and any
registered holder of any Right Certificate (or, prior to the Distribution Date,
of the Common Shares), without the consent of the Rights Agent or of the holder
of any other Right Certificate (or, prior to the Distribution Date, of the
Common Shares), may, in his or her own behalf and for his or her own benefit,
enforce, and may institute and maintain any suit, action or proceeding against
the Company to enforce, or otherwise act in respect of, his or her right to
exercise the Rights evidenced by such Right Certificate in the manner provided
in such Right Certificate and in this Agreement. Without limiting the foregoing
or any remedies available to the holders of Rights, it is specifically
acknowledged that the holders of Rights would not have an adequate remedy at law
for any breach of this Agreement and will be entitled to specific performance of
the obligations under, and injunctive relief against actual or threatened
violations of the obligations of any Person subject to, this Agreement.

SECTION 16. AGREEMENT OF RIGHT HOLDERS

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

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

         (b) after the Distribution Date, the Right Certificates are
transferable only on the registry books of the Rights Agent if surrendered at
the 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 

                                      -20-
<PAGE>   24
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 that 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 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 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 

                                      -21-
<PAGE>   25
acknowledged, by the proper person or persons, or otherwise upon the advice of
counsel as set forth in Section 20 hereof.

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

     Any corporation into which the Rights Agent or any successor Rights Agent
may be merged or with which it may be consolidated, or any corporation resulting
from any merger or consolidation to which the Rights Agent or any successor
Rights Agent shall be a party, or any corporation succeeding to the stock
transfer or corporate trust powers 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 (who may be legal
counsel for the Company), and the opinion of such counsel shall be full and
complete authorization and protection to the Rights Agent as to any action taken
or omitted by it in good faith and in accordance with such opinion.

                                      -22-
<PAGE>   26
         (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, 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 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 Section 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 actual
notice that such change or adjustment is required); 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 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.

                                      -23-
<PAGE>   27
         (g) The Rights Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from any
one of the Chairman of the Board, the Chief Executive Officer, the President,
any Vice President, the 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.

         (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.

SECTION 21. CHANGE OF RIGHTS AGENT

         The Rights Agent or any successor Rights Agent may resign and be
discharged from its duties under this Agreement upon 30 days' notice in writing
mailed to the Company and to each transfer agent of the Common 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 of 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 or her Right
Certificate for inspection by the Company), then the registered holder of any
Right 

                                      -24-
<PAGE>   28
Certificate may apply to any court of competent jurisdiction for the appointment
of a new Rights Agent. Any successor Rights Agent, whether appointed by the
Company or by such a court, shall be a corporation organized and doing business
under the laws of the United States or of the State of Washington or New York
(or of any other state of the United States so long as such corporation is
authorized to do business as a banking institution in the State of Washington or
New York), in good standing, having an office in the State of Washington or New
York, 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 that has at the time of its appointment as Rights Agent a combined
capital and surplus of at least $50 million. After appointment, the successor
Rights Agent shall be vested with the same powers, rights, duties and
responsibilities as if it had been originally named as Rights Agent without
further act or deed; but the predecessor Rights Agent shall deliver and transfer
to the successor Rights Agent any property at the time held by it hereunder, and
execute and deliver any further assurance, conveyance, act or deed necessary for
the purpose. Not later than the effective date of any such appointment the
Company shall file notice thereof in writing with the predecessor Rights Agent
and each transfer agent of the 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 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.

SECTION 23. REDEMPTION

         (a) The Board of Directors may, at its option, at any time prior to
such time as any Person becomes an Acquiring Person, redeem all but not less
than all of the then outstanding Rights at a redemption price of $.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"). The redemption of the Rights
by the Board of Directors may be 

                                      -25-
<PAGE>   29
made effective at such time, on such basis and with such conditions as the Board
of Directors in its sole discretion may establish.

         (b) Immediately upon the action of the Board of Directors ordering the
redemption of the Rights pursuant to paragraph (a) of this Section 23, 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, 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. Any
notice which is mailed in the manner herein provided shall be deemed given,
whether or not the holder receives the notice. Each such notice of redemption
will state the method by which the payment of the Redemption Price will be made.
Neither the Company nor any of its Affiliates or Associates may redeem, acquire
or purchase for value any Rights at any time in any manner other than that
specifically set forth in this Section 23 or in Section 24 hereof, and other
than in connection with the purchase of Common Shares prior to the Distribution
Date.

SECTION 24. EXCHANGE

         (a) The Board of Directors may, at its option, at any time after any
Person becomes an Acquiring Person, exchange all or part of the then outstanding
and exercisable Rights (which shall not include Rights that have become void
pursuant to the 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 ordering the
exchange of any Rights pursuant to paragraph (a) of this Section 24 and without
any further action and without any notice, the right to exercise such Rights
shall terminate and the only right thereafter of a holder of such Rights shall
be to receive

                                      -26-
<PAGE>   30
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. Any notice that 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 that will be exchanged. Any partial exchange shall be effected pro rata
based on the number of Rights (other than Rights that have become void pursuant
to the provisions of Section 11(a)(ii) hereof) held by each holder of Rights.

         (c) If there shall not be sufficient Common Shares authorized but
unissued to permit any exchange of Rights as contemplated in accordance with
this Section 24, the Company shall take all such action as may be necessary to
authorize additional Common Shares for issuance upon exchange of the Rights. If
the Company shall, after good faith effort, be unable to take all such action as
may be necessary to authorize such additional Common Shares, the Company shall
substitute, for each Common Share that would otherwise be issuable upon exchange
of a Right, a number of Preferred Shares or fraction thereof such that the
current per share market price of one Preferred Share multiplied by such number
or fraction is equal to the current per share market price of one Common Share
as of the date of issuance of such Preferred Shares or fraction thereof.

         (d) The Company shall not be required to issue fractions of Common
Shares or to distribute certificates that 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
paragraph (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 prior to the date of
exchange 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 

                                      -27-
<PAGE>   31
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 purposes of such stock dividend, or distribution of rights or warrants,
or the date on which such reclassification, consolidation, merger, sale,
transfer, liquidation, dissolution, or winding up is to take place and the date
of participation therein by the holders of the Common Shares and/or 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 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 such event and the
consequences of such event to holders of Rights under Section 11(a)(ii) hereof.

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:

                                      -28-
<PAGE>   32
              NeoRx Corporation
              410 West Harrison Street
              Seattle, Washington 98119
              Attention:  Corporate Secretary

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:

              First Interstate Bank of Washington, N.A.
              P.O. Box 21927
              Seattle, Washington 98111
              Attention:  Ardis Dee Henderson

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

     The Company may from time to time supplement or amend this Agreement
without the approval of any holders of Right Certificates in order to cure any
ambiguity, to correct or supplement any provision contained herein that may be
defective or inconsistent with any other provisions herein, or to make any other
provisions with respect to the Rights that the Company may deem necessary or
desirable, any such supplement or amendment to be evidenced by a writing signed
by the Company and the Rights Agent; provided, however, that from and after such
time as any Person becomes an Acquiring Person, this Agreement shall not be
amended in any manner that would adversely affect the interests of the holders
of Rights. Without limiting the foregoing, the Company may at any time prior to
such time as any Person becomes an Acquiring Person amend this Agreement to
lower the thresholds set forth in Sections 1(a) and 3(a) hereof to not less than
the greater of (a) the sum of .001% and the largest percentage of the
outstanding Common Shares then known by the Company to be beneficially owned by
any Person (other than the Company, any Subsidiary of the Company, any employee
benefit plan of the Company or any Subsidiary of the Company, or any entity
holding Common Shares for or pursuant to the terms of any such plan) and (b)
10%.

                                      -29-
<PAGE>   33
SECTION 28. SUCCESSORS

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

SECTION 29. 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 30. 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 31. 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 Washington and for all
purposes shall be governed by and construed in accordance with the laws of such
State applicable to contracts to be made and performed entirely within such
State.

SECTION 32. 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 one and the same instrument.

SECTION 33. 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.

                                      -30-
<PAGE>   34
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed, all as of the day and year first above written.

                                               NEORX CORPORATION

                                            By   /s/  ROBERT M. LITTAUER
                                                 -------------------------------
                                                 Robert M. Littauer
                                                 Senior Vice President, Chief
                                                 Financial Officer and Treasurer

                                               FIRST INTERSTATE BANK
                                               OF WASHINGTON, N.A.

                                            By   /s/  ARDIS DEE HENDERSON
                                                 -------------------------------
                                                 Ardis Dee Henderson
                                                 Vice President

                                      -31-
<PAGE>   35
                                                                       Exhibit A

                              ARTICLES OF AMENDMENT
                                       OF
                                NEORX CORPORATION

     Pursuant to RCW 23B.06.020, NeoRx Corporation, a Washington corporation,
hereby states that the Designation of Rights and Preferences of Series A Junior
Participating Preferred Stock attached hereto as Exhibit A was duly adopted by
the Board of Directors on April 10, 1996.

     These Articles of Amendment are executed by said corporation by its duly
authorized officer.

     DATED: April 11, 1996

                                                 NEORX CORPORATION

                                                 By  /s/  ROBERT M. LITTAUER
                                                     ---------------------------
                                                     Robert M. Littauer
                                                     Senior Vice President

                                      A-1
<PAGE>   36
                                                                       EXHIBIT A
                                                        TO ARTICLES OF AMENDMENT

                      DESIGNATION OF RIGHTS AND PREFERENCES
                OF SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

     SECTION 1. DESIGNATION OF SERIES A JUNIOR PARTICIPATING PREFERRED STOCK AND
AMOUNT.

     The shares of such series shall be designated as "Series A Junior
Participating Preferred Stock" (the "Series A Preferred Stock") and the number
of shares constituting the Series A Preferred Stock shall be 600,000, par value
$.02 per share. Such number of shares may be increased or decreased by
resolution of the Board of Directors; provided, however, that no decrease shall
reduce the number of shares of Series A 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 Rights (the "Rights") issued pursuant to the
Rights Agreement dated as of April 10, 1996 between the Corporation and First
Interstate Bank of Washington, N.A., as Rights Agent (the "Rights Agreement"),
and provided, further, that if more than a total of 600,000 shares of Series A
Preferred Stock shall be issuable upon the exercise of the Rights, the Board of
Directors, pursuant to Section 23B.06.020 of the Washington Business Corporation
Act, shall direct by resolution that Articles of Amendment be properly executed
and filed, in accordance with the provisions thereof, providing for an increase
in the authorized shares of Series A Preferred Stock to the largest number of
whole shares issuable upon exercise of the Rights.

     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 Series
A Preferred Stock with respect to dividends, the holders of shares of Series A
Preferred Stock, in preference to the holders of Common Stock, par value $.02
per share (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 Series A Preferred Stock, in an
amount per share (rounded to the nearest cent) equal to the greater of (i) $1
and (ii) subject to the provision for adjustment hereinafter set forth, 100
times 

                                      A-2
<PAGE>   37
the aggregate per share amount of all cash dividends, and 100 times the
aggregate per share amount (payable in kind) of all noncash dividends or other
distributions, other than a dividend payable in shares of Common Stock or a
subdivision of the outstanding shares of Common Stock (by reclassification or
otherwise), declared on the Common Stock since the immediately preceding
Quarterly Dividend Payment Date or, with respect to the first Quarterly Dividend
Payment Date, since the first issuance of any share or fraction of a share of
Series A 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 Series A
Preferred Stock were entitled immediately prior to such event under clause (ii)
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
Series A Preferred Stock as provided in paragraph (A) of this Section 2
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock); provided, however,
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 per share
on the Series A 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 Series A 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 Series A 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 Series A Preferred Stock in an amount less than the total
amount of such dividends at the time accrued and payable on such shares shall be
allocated pro rata on a share-by-share basis among all such shares at 

                                      A-3
<PAGE>   38
the time outstanding. The Board of Directors may fix a record date for the
determination of holders of shares of Series A 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 Series A Preferred Stock shall have the following
voting rights:

         (A) Subject to the provision for adjustment hereinafter set forth, each
share of Series A 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 Series A
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
Designations creating a series of Preferred Stock or any similar stock, or by
law, the holders of shares of Series A 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.

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

     SECTION 4. CERTAIN RESTRICTIONS.

         (A) Whenever quarterly dividends or other dividends or distributions
payable on the Series A Preferred Stock as provided in Section 2 are in arrears,
thereafter and until all accrued and unpaid dividends and distributions, whether
or not 

                                      A-4
<PAGE>   39
declared, on shares of Series A 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 Series A 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 Series A Preferred Stock,
     except dividends paid ratably on the Series A Preferred Stock and all such
     parity stock on which dividends are payable or in arrears in proportion to
     the total amounts to which the holders of all such shares are then
     entitled;

              (iii) redeem or purchase or otherwise acquire for consideration
     shares of any stock ranking junior (either as to dividends or upon
     liquidation, dissolution or winding up) to the Series A 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 Series A Preferred Stock; or

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

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

     SECTION 5. REACQUIRED SHARES.

     Any shares of Series A 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 

                                      A-5
<PAGE>   40
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 Certificate of Incorporation of the
Corporation (the "Certificate of Incorporation"), or in any other Certificate of
Designations 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 (a) to the holders of shares of stock ranking junior
(either as to dividends or upon liquidation, dissolution or winding up) to the
Series A Preferred Stock unless, prior thereto, the holders of shares of Series
A Preferred Stock shall have received $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, provided that the holders of shares of Series A
Preferred Stock shall be entitled to receive 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 (b) to the holders of shares of stock ranking on a parity
(either as to dividends or upon liquidation, dissolution or winding up) with the
Series A Preferred Stock, except distributions made ratably on the Series A
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 Series A Preferred Stock were entitled immediately prior to
such event under the proviso in clause (a) 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 Series A Preferred Stock shall at
the same time be similarly exchanged or changed into an amount per share,
subject to the provision for 

                                      A-6
<PAGE>   41
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 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 Series A 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 Series A Preferred Stock shall not be redeemable.

     SECTION 9. RANK.

     The Series A Preferred Stock shall rank, with respect to the payment of
dividends and the distribution of assets, junior to all series of any other
class of the Preferred Stock.

     SECTION 10. AMENDMENT.

     The Certificate of Incorporation shall not be amended in any manner that
would materially alter or change the powers, preferences or special rights of
the Series A 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 Series A Preferred Stock, voting together as a single class.

                                      A-7
<PAGE>   42
                                                                       Exhibit B

                            Form of Right Certificate

Certificate No. R-                                                  _____ Rights

         NOT EXERCISABLE AFTER APRIL 10, 2006 OR EARLIER IF REDEMPTION OR
         EXCHANGE OCCURS. THE RIGHTS ARE SUBJECT TO REDEMPTION AT $.001 PER
         RIGHT AND TO EXCHANGE ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT.

                                Right Certificate

                                NEORX 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 April 10, 1996 (the "Rights Agreement"), between NeoRx
Corporation, a Washington corporation (the "Company"), and First Interstate Bank
of Washington, 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., Seattle time, on April 10, 2006 at the
principal office of the Rights Agent, 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, par value $.02 per share (the "Preferred
Shares"), of the Company, at a purchase price of $40.00 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 that may be purchased upon exercise hereof)
set forth above, and the Purchase Price set forth above, are the number and
Purchase Price as of April 10, 1996, based on the Preferred Shares as
constituted at such date. As provided in the Rights Agreement, the Purchase
Price and the number of one one-hundredths of a Preferred Share that 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 the terms, provisions and
conditions of the Rights Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference 

                                      B-1
<PAGE>   43
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 offices of the
Rights Agent.

     This Right Certificate, with or without other Right Certificates, upon
surrender at the principal office of the Rights Agent, may be exchanged for
another Right Certificate or Right Certificates of like tenor and date
evidencing Rights entitling the holder to purchase a like aggregate number of
Preferred Shares 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
$.001 per Right or (ii) may be exchanged in whole or in part for shares of the
Company's Common Stock, par value $.02 per share, or for Preferred Shares.

     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, that 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 that 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.

     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.
Dated as of ______________.

                                      B-2
<PAGE>   44
                                NEORX CORPORATION

                                                   By
                                                     ---------------------------
Countersigned:

[                        ]
 ------------------------



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

                                      B-3
<PAGE>   45
                    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 this Right Certificate on the books of the within-named Company, with
full power of substitution.

     The undersigned hereby certifies that the Rights evidenced by this Right
Certificate are not beneficially owned by an Acquiring Person or an Affiliate or
Associate thereof (as such terms are defined in the Rights Agreement).

Dated:_________________________

                                                  ______________________________
                                                  Signature

Signature Guarantee*

                                                  ______________________________


____________
*Your signature must be guaranteed by an eligible guarantor institution (a bank,
stock brokerage firm, savings and loan association or credit union with
membership in an approved signature medallion program).

                                      B-4
<PAGE>   46
             Form of Reverse Side of Right Certificate -- continued

                          FORM OF ELECTION TO PURCHASE
                  (To be executed if holder desires to exercise
                 Rights represented by the Right Certificate.)

To:  NEORX CORPORATION

     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)

________________________________________________________________________________

     The undersigned hereby certifies that the Rights evidenced by this Right
Certificate are not beneficially owned by an Acquiring Person or an Affiliate or
Associate thereof (as defined in the Rights Agreement).

Dated:_____________________

                                                        ________________________
                                                        Signature

Signature Guarantee*

                                                        ________________________

______________
*Your signature must be guaranteed by an eligible guarantor institution (a bank,
stock brokerage firm, savings and loan association or credit union with
membership in an approved signature medallion program).

                                      B-5
<PAGE>   47
             Form of Reverse Side of Right Certificate -- continued

________________________________________________________________________________


________________________________________________________________________________

                                     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 on 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-6
<PAGE>   48
                                                                       Exhibit C

                          SUMMARY OF RIGHTS TO PURCHASE
                                PREFERRED SHARES

     Board Action. On April 10, 1996, the Board of Directors (the "Board of
Directors") of NeoRx Corporation (the "Company") declared a dividend of one
preferred share purchase right (a "Right") for each outstanding share of common
stock, par value $.02 per share (the "Common Shares"), of the Company. The
dividend is payable on April 19, 1996 (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, par value $.02 per share (the "Preferred Shares"), of the
Company at a price of $40.00 per one one-hundredth of a Preferred Share (the
"Purchase Price"), subject to adjustment. The description and terms of the
Rights are set forth in a Rights Agreement (the "Rights Agreement") between the
Company and First Interstate Bank, N.A., as Rights Agent (the "Rights Agent").

     Triggering Events. Until the earlier to occur of (i) 10 days following a
public announcement that a person or group of affiliated or associated persons
(an "Acquiring Person") has acquired beneficial ownership of 20% or more of the
outstanding Common Shares (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 group of affiliated persons becomes an Acquiring Person) following the
commencement of, or announcement of an intention to make, a tender offer or
exchange offer the consummation of which would result in the beneficial
ownership by a person or group of 20% or more of the outstanding Common Shares
(the earlier of such dates being called the "Distribution Date"), the Rights
will be evidenced by Common Share certificates.

     Rights Are Attached to Common Stock. The Rights Agreement provides that,
until the Distribution Date (or earlier redemption or expiration of the Rights),
the Rights will be transferred with and only with the Common Shares. Until the
Distribution Date (or earlier redemption or expiration of the Rights), the
surrender for transfer of any certificates for Common Shares 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.

                                      C-1
<PAGE>   49
     The Rights are not exercisable until the Distribution Date. The Rights will
expire on April 10, 2006 (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.

     Exercise of Rights. In the event any Person becomes an Acquiring Person,
each holder of a Right shall thereafter 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 the Rights Agreement and in lieu of
Preferred Shares, such number of Common Shares of the Company 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 Company's Common Shares.

     If after a person or group has become an Acquiring Person 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, 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 Purchase Price of the Right, that
number of shares of common stock of the acquiring company that at the time of
such transaction will have a market value of two times the Purchase Price of the
Right. If 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 (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 Purchase
Price of the Right.

     At any time after any person or group 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 may exchange the Rights (other than Rights
owned by such person or group that will 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 (subject to adjustment).

     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 $1 per share, but will be
entitled to an 

                                      C-2
<PAGE>   50
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 antidilution 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.

     Redemption of Rights. At any time prior to the acquisition by a person or
group of affiliated or associated persons of beneficial ownership of 20% or more
of the outstanding Common Shares, the Board of Directors may redeem the Rights
in whole, but not in part, at a price of $.001 per Right (the "Redemption
Price"). 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.

     Amendment of Rights. The terms of the Rights may be amended by the Board of
Directors without the consent of the holders of the Rights, including an
amendment to lower certain thresholds described above to not less than the
greater of (i) the sum of .001% and the largest percentage of the outstanding
Common Shares then known to the Company to be beneficially owned by any person
or group of affiliated or associated persons and (ii) 10%, except that, from and
after such time as any person or group of affiliated or associated persons
becomes an Acquiring Person, no such amendment may adversely affect the
interests of the holders of the Rights.

     Further Information. A copy of the Rights Agreement has been filed with the
Securities and Exchange Commission as an Exhibit to a Registration Statement on
Form 8-A dated April 15, 1996. A copy of the Rights Agreement is available free
of charge from the Company. This summary description of the Rights does not
purport to be complete and is qualified in its entirety by reference to the
Rights Agreement, which is hereby incorporated herein by reference.

                                      C-3


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