MOBILE MINI INC
8-A12G, 1999-12-13
FABRICATED PLATE WORK (BOILER SHOPS)
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 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


                                MOBILE MINI, INC.
                                -----------------
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

               DELAWARE                                 86-0748362
               --------                                 ----------
(STATE OF INCORPORATION OR ORGANIZATION)    (I.R.S. EMPLOYER IDENTIFICATION NO.)


 1834 West Third Street, Tempe, Arizona                     85281
 --------------------------------------                     -----
(ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                  (ZIP CODE)



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

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


Securities Act registration statement file number to which this form relates:
______________ (If applicable)

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


<TABLE>
<S>                                          <C>
         TITLE OF EACH CLASS                  NAME OF EACH EXCHANGE ON WHICH
         TO BE SO REGISTERED                  EACH CLASS IS TO BE REGISTERED
         -------------------                  ------------------------------
</TABLE>


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


                         Preferred Stock Purchase Rights
                         -------------------------------
                                (TITLE OF CLASS)
<PAGE>   2
ITEM 1. DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED.


         On December 9, 1999, the Board of Directors of Mobile Mini, Inc. (the
"Company") declared a dividend of one preferred share purchase right (a "Right")
for each outstanding share of common stock, par value $0.01 per share, of the
Company (the "Common Stock"). The dividend distribution is payable on December
30, 1999 (the "Record Date") to the stockholders of record on that date. Each
Right entitles the registered holder to purchase from the Company one
one-hundredth of a share of Series C Junior Participating Preferred Stock, par
value $0.01 per share (the "Preferred Stock") of the Company at a price of
$80.00 per one one-hundredth of a share of Preferred Stock (the "Purchase
Price"), subject to adjustment. The description and terms of the Rights are set
forth in a Rights Agreement dated as of December 9, 1999, as the same may be
amended from time to time (the "Rights Agreement"), between the Company and
Norwest Bank Minnesota, N.A., as Rights Agent (the "Rights Agent").

         Until the earlier to occur of (i) the close of business on the tenth
business day following the date of public announcement or the date on which the
Company first has notice or determines that a person or group of affiliated or
associated persons (other than the Company, any subsidiary of the Company or any
employee benefit plan of the Company or Richard E. Bunger, his family and
certain related entities) (an "Acquiring Person") has acquired, or obtained the
right to acquire, 15% or more of the outstanding shares of voting stock of the
Company without the prior express written consent of the Company executed on
behalf of the Company by a duly authorized officer of the Company following
express approval by action of at least a majority of the members of the Board of
Directors then in office (the "Stock Acquisition Date") or (ii) the close of
business on the tenth business day (or such later date as may be determined by
action of the Board of Directors but not later than the Stock Acquisition Date)
following the commencement of a tender offer or exchange offer, without the
prior written consent of the Company, by a person (other than the Company, any
subsidiary of the Company or an employee benefit plan of the Company or Richard
E. Bunger, his family and certain related entities) which, upon consummation,
would result in such party's control of 15% or more of the Company's voting
stock (the earlier of the dates in clause (i) or (ii) above being called the
"Distribution Date"), the Rights will be evidenced, with respect to any of the
Common Stock certificates outstanding as of the Record Date, by such Common
Stock certificates.

         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 Company's Common Stock. Until the Distribution Date (or
earlier redemption, exchange or expiration of the Rights), new Common Stock
certificates issued after the Record Date upon transfer or new issuances of
Common Stock will contain a notation incorporating the Rights Agreement by
reference. Until the Distribution Date (or earlier redemption, exchange or
expiration of the Rights), the surrender for transfer of any certificates for
shares of Common Stock outstanding as of the Record Date, even without such
notation or a copy of this Summary of Rights, will also constitute the transfer
of the Rights associated with the Common Stock 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 Stock as of the close of business on the Distribution Date and
such separate certificates alone will then evidence the Rights.

         The Rights are not exercisable until the Distribution Date. The Rights
will expire, if not previously exercised, on December 30, 2009 (the "Final
Expiration Date"), unless the Final
<PAGE>   3
Expiration Date is extended or unless the Rights are earlier redeemed or
exchanged by the Company.

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

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

         Shares of Preferred Stock purchasable upon exercise of the Rights will
not be redeemable and junior to any other series of preferred stock the Company
may issue (unless otherwise provided in the terms of such stock). Each share of
Preferred Stock will have a preferential dividend in an amount equal to 100
times any dividend declared on each share of Common Stock. In the event of
liquidation, the holders of the Preferred Stock will receive a preferred
liquidation payment of equal to the greater of $100 and 100 times the payment
made per share of Common Stock. Each share of Preferred Stock will have 100
votes, voting together with the Common Stock. In the event of any merger,
consolidation or other transaction in which shares of Common Stock are converted
or exchanged, each share of Preferred Stock will be entitled to receive 100
times the amount and type of consideration received per share of Common Stock.
The rights of the Preferred Stock as to dividends, liquidation and voting, and
in the event of mergers and consolidations, are protected by customary
antidilution provisions.

         Because of the nature of the Preferred Stock's dividend, liquidation
and voting rights, the value of the one one-hundredth interest in a share of
Preferred Stock purchasable upon exercise of each Right should approximate the
value of one share of Common Stock.

         If any person or group (other than the Company, any subsidiary of the
Company, any employee benefit plan of the Company or Richard E. Bunger, his
family and certain related entities) acquires 15% or more of the Company's
outstanding voting stock without the prior written consent of the Board of
Directors, each Right, except those held by such persons, would entitle each
holder of a Right to acquire such number of shares of the Company's Common Stock
as shall equal the result obtained by multiplying the then current Purchase
Price by the number of one one-hundredths of a share of Preferred Stock for
which a Right is then exercisable and dividing that product by 50% of the then
current per-share market price of Company Common Stock.

         If any person or group (other than the Company, any subsidiary of the
Company, any employee benefit plan of the Company or Richard E. Bunger, his
family and certain related entities) acquires more than 15% but less than 50% of
the outstanding Company Common Stock
<PAGE>   4
without prior written consent of the Board of Directors, each Right, except
those held by such persons, may be exchanged by the Board of Directors for one
share of Company Common Stock.

         If the Company were acquired in a merger or other business combination
transaction where the Company is not the surviving corporation or where Company
Common Stock is exchanged or changed or 50% or more of the Company's assets or
earnings power is sold in one or several transactions without the prior written
consent of the Board of Directors, each Right would entitle the holders thereof
(except for the Acquiring Person) to receive such number of shares of the
acquiring company's common stock as shall be equal to the result obtained by
multiplying the then current Purchase Price by the number one one-hundredths of
a share of Preferred Stock for which a Right is then exercisable and dividing
that product by 50% of the then current market price per share of the common
stock of the acquiring company on the date of such merger or other business
combination transaction.

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

         At any time prior to the time an Acquiring Person becomes such, the
Board of Directors of the Company may redeem the Rights in whole, but not in
part, at a price of $0.01 per Right (the "Redemption Price"). The redemption of
the Rights may be made effective at such time, on such basis and with such
conditions as the Board of Directors in its sole discretion may establish.
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.

         The terms of the Rights may be amended by the Board of Directors of the
Company without the consent of the holders of the Rights, including, but not
limited to, an amendment to lower certain thresholds described above to not less
than the greater of (i) any percentage greater than the largest percentage of
the voting power of all securities of the Company then known to the Company to
be beneficially owned by any person or group of affiliated or associated persons
(other than an excepted person) 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.

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

         The form of Rights Agreement between the Company and the Rights Agent
specifying the terms of the Rights, which includes as Exhibit B thereto the form
of Right Certificate, is attached hereto as Exhibit 1 and is incorporated herein
by reference. The foregoing description of the Rights does not purport to be
complete and is qualified in its entirety by reference to the form of Rights
Agreement (and the exhibits thereto) attached hereto.
<PAGE>   5
ITEM 2. EXHIBITS.


<TABLE>
<CAPTION>
Exhibit No.                         Description of Exhibit
- -----------                         ----------------------
<S>                        <C>
       1                   Form of Rights Agreement, dated as of December 9,
                           1999, between Mobile Mini, Inc. and Norwest Bank
                           Minnesota, N.A., as Rights Agent, which includes the
                           form of Certificate of Designations, setting forth
                           the terms of the Series C Junior Participating
                           Preferred Stock, par value $0.01 per share, as
                           Exhibit A, the form of Right Certificate as Exhibit B
                           and the Summary of Preferred Stock Purchase Rights as
                           Exhibit C. Pursuant to the Rights Agreement, printed
                           Right Certificates will not be mailed until as soon
                           as practicable after the earlier of the tenth day
                           after public announcement that a person or group
                           (except for certain exempted persons or groups) has
                           acquired beneficial ownership of 15% or more of the
                           outstanding shares of Common Stock or the tenth
                           business day (or such later date as may be determined
                           by action of the Board of Directors) after a person
                           commences, or announces its intention to commence, a
                           tender offer or exchange offer the consummation of
                           which would result in the beneficial ownership by a
                           person or group of 15% or more of the outstanding
                           shares of Common Stock.


       2                   Letter to be sent to the Stockholders of Mobile Mini,
                           Inc.
</TABLE>


                                    SIGNATURE


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


                                  MOBILE MINI, INC.
                                  (Registrant)


Date:    December 13, 1999        By: /s/ Larry Trachtenberg
                                     -----------------------------------------
                                        Larry Trachtenberg
                                        Chief Financial Officer and
                                        Executive Vice President
<PAGE>   6
                                  EXHIBIT INDEX
                                  -------------

<TABLE>
<CAPTION>
Exhibit No.                         Description of Exhibit
- -----------                         ----------------------
<S>                        <C>
       1                   Form of Rights Agreement, dated as of December 9,
                           1999, between Mobile Mini, Inc. and Norwest Bank
                           Minnesota, N.A., as Rights Agent, which includes the
                           form of Certificate of Designations, setting forth
                           the terms of the Series C Junior Participating
                           Preferred Stock, par value $0.01 per share, as
                           Exhibit A, the form of Right Certificate as Exhibit B
                           and the Summary of Preferred Stock Purchase Rights as
                           Exhibit C. Pursuant to the Rights Agreement, printed
                           Right Certificates will not be mailed until as soon
                           as practicable after the earlier of the tenth day
                           after public announcement that a person or group
                           (except for certain exempted persons or groups) has
                           acquired beneficial ownership of 15% or more of the
                           outstanding shares of Common Stock or the tenth
                           business day (or such later date as may be determined
                           by action of the Board of Directors) after a person
                           commences, or announces its intention to commence, a
                           tender offer or exchange offer the consummation of
                           which would result in the beneficial ownership by a
                           person or group of 15% or more of the outstanding
                           shares of Common Stock.

       2                   Letter to be sent to the Stockholders of Mobile Mini,
                           Inc.
</TABLE>



<PAGE>   1
                                                                       EXHIBIT 1




                                RIGHTS AGREEMENT



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



                                MOBILE MINI, INC.



                                       and



                          NORWEST BANK MINNESOTA, N.A.


                                  Rights Agent



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



                          Dated as of December 9, 1999
<PAGE>   2
                                      INDEX
                                      -----


<TABLE>
<CAPTION>
                                                                                                                Page
                                                                                                                ----


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


Section 2.  Appointment of Rights Agent                                                                           5


Section 3.  Issue of Right Certificates                                                                           5


Section 4.  Form of Right Certificates                                                                            7


Section 5.  Countersignature and Registration                                                                     8


Section 6.  Transfer, Split Up, Combination and Exchange of Right Certificates; Mutilated, Destroyed,
            Lost or Stolen Right Certificates                                                                     8


Section 7.  Exercise of Rights; Purchase Price; Expiration Date of Rights                                         9


Section 8.  Cancellation and Destruction of Right Certificates                                                   11


Section 9.  Reservation and Availability of Shares of Preferred Stock                                            11


Section 10.  Preferred Stock Record Date                                                                         12


Section 11.  Adjustment of Purchase Price, Number of Shares or Number of Rights                                  12


Section 12.  Certificate of Adjusted Purchase Price or Number of Shares                                          18


Section 13.  Consolidation, Merger or Sale or Transfer of Assets or Earning Power                                19


Section 14.  Fractional Rights and Fractional Shares                                                             21


Section 15.  Rights of Action                                                                                    22


Section 16.  Agreement of Right Holders                                                                          23
</TABLE>


                                       i
<PAGE>   3
<TABLE>
<S>                                                                                                             <C>
Section 17.  Right Certificate Holder Not Deemed a Stockholder                                                   23


Section 18.  Concerning the Rights Agent                                                                         23


Section 19.  Merger or Consolidation or Change of Name of Rights Agent                                           24


Section 20.  Duties of Rights Agent                                                                              24


Section 21.  Change of Rights Agent                                                                              26


Section 22.  Issuance of New Right Certificates                                                                  27


Section 23.  Redemption and Termination                                                                          27


Section 24.  Exchange                                                                                            28


Section 25.  Notice of Proposed Actions                                                                          29


Section 26.  Notices                                                                                             30


Section 27.  Supplements and Amendments                                                                          30


Section 28.  Successors                                                                                          31


Section 29.  Benefits of This Rights Agreement                                                                   31


Section 30.  Severability                                                                                        31


Section 31.  Governing Law                                                                                       31


Section 32.  Counterparts                                                                                        32


Section 33.  Descriptive Headings                                                                                32
</TABLE>

Exhibit A -  Form of Certificate of Designations for
                           Series C Junior Participating


                                       ii
<PAGE>   4
                           Preferred Stock
Exhibit B -  Form of Right Certificate
Exhibit C -  Summary of Preferred Stock Purchase Rights





                                      iii
<PAGE>   5
                                RIGHTS AGREEMENT
                                ----------------


         This Rights Agreement, dated as of December 9, 1999 is entered into
between Mobile Mini, Inc., a Delaware corporation (the "Company") and Norwest
Bank Minnesota, N.A., a national banking association (the "Rights Agent").

                               W I T N E S S E T H
                               -------------------

         WHEREAS, on December 9, 1999 the Board of Directors of the Company
authorized and declared a dividend distribution of one right (hereinafter
referred to as a "Right") for each share of Common Stock, par value $0.01 per
share, of the Company outstanding at the close of business on December 30, 1999
(the "Record Date"), (other than shares of such Common Stock held in the
Company's treasury on such date) and has authorized the issuance of one Right in
respect of each share of Common Stock of the Company issued between the Record
Date (whether originally issued or issued from the Company's treasury) and the
Distribution Date (as such term is defined in Section 3 hereof), each Right
representing the right to purchase one one-hundredth of a share of Series C
Junior Participating Preferred Stock of the Company having the rights, powers
and preferences set forth in the form of Certificate of Designations attached
hereto as Exhibit A, upon the terms and subject to the conditions hereinafter
set forth (the "Rights"); and

         WHEREAS, the Company desires to appoint the Rights Agent to act as
provided herein, and the Rights Agent is willing to so act.

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

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

                  (a) "Acquiring Person" shall mean any Person (as hereinafter
defined) who or which, together with all Affiliates (as hereinafter defined) and
Associates (as hereinafter defined) of such Person, without the Prior Written
Approval of the Company (as hereinafter defined), shall be the Beneficial Owner
(as hereinafter defined) of securities of the Company constituting 15% or more
of the Voting Power (as hereinafter defined) of the Company or was such a
Beneficial Owner at any time after the date hereof, whether or not such Person
continues to be the Beneficial Owner of securities representing 15% or more of
the Voting Power of the Company, but shall not include (i) the Company, any
Subsidiary of the Company, any employee benefit plan or compensation arrangement
of the Company or any Subsidiary of the Company, or any entity holding
securities of the Company to the extent organized, appointed or established by
the Company or any Subsidiary of the Company for or pursuant to the terms of any
such employee benefit plan or compensation arrangement, (ii) an Excepted Person
(as hereinafter defined), or (iii) any Person who or which, together with all
Affiliates and Associates of such Person, inadvertently may become the
Beneficial Owner of securities of the Company representing 15% or more of the
Voting Power of the Company or otherwise becomes such a Beneficial Owner without
a plan or intention to acquire control of the Company, so long as such Person,
individually or together with the Affiliates and Associates of such Person,
promptly enters into, and delivers to the Company, an irrevocable commitment
promptly to divest, and
<PAGE>   6
thereafter promptly divests (without exercising or retaining any power,
including voting, with respect to such securities), sufficient securities of the
Company so that such Person, together with all Affiliates and Associates of such
Person, ceases to be the Beneficial Owner of 15% or more of the Voting Power of
the Company. Notwithstanding the foregoing, no Person shall become an "Acquiring
Person" as the result of an acquisition of voting securities of the Company by
the Company which, by reducing the amount of such securities outstanding,
increases the proportionate voting power of such securities beneficially owned
by such Person to 15% or more of the Voting Power; provided, however, that if a
Person becomes the Beneficial Owner of securities constituting 15% or more of
the Voting Power of the Company by reason of purchases by the Company and shall,
after such purchases by the Company, become the Beneficial Owner of any
additional voting securities of the Company without the Prior Written Approval
of the Company, then such Person shall be deemed to be an Acquiring Person.
Notwithstanding any provision to the contrary in this Rights Agreement, no
amendment shall be made to the definition of "Acquiring Person" or "Excepted
Person" without the consent of an Excepted Person if the effect of such
amendment would be to reduce the aggregate percentage ownership of Voting Power
that such Excepted Person would be permitted to beneficially own at any time
without being an Acquiring Person hereunder.

                  (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 hereof.

                  (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 as
         determined pursuant to Rule 13d-3 of the General Rules and Regulations
         under the Exchange Act, as in effect on the date hereof;

                           (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
         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 payment 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 any security under this clause
         (B) if the agreement, arrangement or understanding to vote such
         security (1) arises solely from a revocable proxy or consent given in
         response to a public proxy or consent solicitation made pursuant to,
         and in accordance with, the applicable rules and regulations under the
         Exchange Act and (2) is not also then reportable by such person on
         Schedule 13D under the Exchange Act (or any comparable or successor
         report); or


                                       2
<PAGE>   7
                           (iii) which are beneficially owned, directly or
         indirectly, by any other Person with which such Person or any of such
         Person's Affiliates or Associates has any agreement, arrangement or
         understanding (other than customary agreements with and between
         underwriters and selling group members with respect to a bona fide
         public offering of securities) for the purpose of acquiring, holding,
         voting (except pursuant to a revocable proxy or consent as described in
         clause (B) of subparagraph (ii) of this paragraph (c)) 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) "Board of Directors" shall mean the Board of Directors of
the Company as constituted from time to time.

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

                  (f) "Close of business" on any given date shall mean 5:00
P.M., Tempe, Arizona time, on such date; provided, however, that if such date is
not a Business Day it shall mean 5:00 P.M., Tempe, Arizona time, on the next
succeeding Business Day.

                  (g) "Common Stock" shall mean the Common Stock, par value
$0.01 per share, of the Company, except that "Common Stock" when used with
reference to any Person other than the Company shall mean the capital stock with
the greatest Voting Power of such Person or the equity securities or other
equity interest having power to control or direct the management of such Person
or, if such Person is a Subsidiary (as hereinafter defined) of another Person,
of the Person which ultimately controls such first-mentioned Person and which
has issued and outstanding such capital stock, equity securities or equity
interests.

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

                  (i) "Excepted Person" shall mean:

                           (i) REB/RMB Family Limited Partnership, its
Affiliates, Richard E. Bunger, his spouse, if any, and any family trusts
established for the benefit of members of the family of Richard E. Bunger
(whether now existing or hereafter created);

                           (ii) any child, grandchild or great-grandchild,
whether by birth or adoption, whether now living or hereafter born, of Richard
E. Bunger;

                           (iii) Any estate of, or the executor or administrator
of any estate of, or any guardian or custodian for Richard E. Bunger, his
spouse, if any, and any Person described in subparagraph (ii) of this definition
who is given a revocable proxy by such Person


                                       3
<PAGE>   8
with respect to voting securities of the Company of which such Person is the
Beneficial Owner or who is or becomes an attorney-in-fact or agent of such
person;

                           (iv) Any legal advisor of Richard E. Bunger, his
spouse, if any, or any Person described in subparagraph (ii) of this definition
(so long as such executor, administrator, guardian or custodian is acting in
such person's capacity as such);

                           (v) Any Person, whether now existing or hereafter
formed, of which substantially all of the outstanding beneficial, voting or
equity interests are beneficially owned, directly or indirectly, by Richard E.
Bunger, his spouse, if any, and one or more of the Persons described in
subparagraphs (ii), (iii) and (iv) of this definition, or any charitable
organization which qualifies as an exempt organization under Section 501(c) of
the Internal Revenue Code of 1986, as amended, which is established by Richard
E. Bunger, his spouse, if any, or any of the Persons described in subparagraphs
(ii), (iii) and (iv) of this definition; and

                           (vi) Any other Person who or which is an Affiliate or
Associate of Richard E. Bunger, his spouse, if any, and/or any Person described
in subparagraph (ii), (iii), (iv) or (v) of this definition as of the date
hereof;

                  provided, however, that an Excepted Person shall cease to be
an Excepted Person at the time that all or any part of such Excepted Person's
Voting Power becomes reportable on Schedule 13D under the Exchange Act (or any
comparable or successor report) as part of a "group" (as that term is used in
Rule 13d-5(b) of the General Rules and Regulations under the Exchange Act, or
any successor provision) that beneficially owns 15% or more of the then
outstanding Voting Power of the Company and that includes one or more Persons
(including any Affiliate or Associate thereof) who are not Excepted Persons and
who individually or in the aggregate beneficially own in excess of 1% of the
then outstanding Voting Power of the Company.

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

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

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

                  (m) "Preferred Stock" shall mean the Series C Junior
Participating Preferred Stock, par value $0.01 per share, of the Company.

                  (n) "Prior Written Approval of the Company" shall mean prior
express written consent of the Company to the actions in question, executed on
behalf of the Company by a duly authorized officer of the Company following
express approval by action of at least a majority of the members of the Board of
Directors then in office.

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

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


                                        4
<PAGE>   9
                  (q) "Section 11(b) Event" shall have the meaning set forth in
Section 11(b) hereof.

                  (r) "Section 13 Event" shall mean an event described in
clauses (x), (y) or (z) of Section 13(a) hereof.

                  (s) "Stock Acquisition Date" shall mean the earlier of (i) the
first date of public announcement by the Company or a Person that an Acquiring
Person has become an Acquiring Person, or (ii) the date on which the Company
first has notice, direct or indirect, or otherwise determines that a Person has
become an Acquiring Person.

                  (t) "Subsidiary" shall mean, with respect to any Person, any
other Person of which securities or other ownership interests having ordinary
Voting Power, in the absence of contingencies, to elect a majority of the board
of directors (or other persons performing similar functions) of such other
Person are at the time directly or indirectly owned by such Person or one or
more of such Person's Subsidiaries, except that "Subsidiary" when used with
reference to the Company shall mean any Person of which either a majority of the
Voting Power of the voting equity securities or a majority of the equity
interests is owned, directly or indirectly, by the Company.

                  (u) "Voting Power" shall mean the voting power of all
securities of a Person then outstanding generally entitled to vote for the
election of directors of the Person (or, where appropriate, for the election of
persons performing similar functions).

                  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 Stock) 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. In the event the Company appoints one or
more Co-Rights Agents, the respective duties of the Rights Agents and any
Co-Rights Agents shall be as the Company shall determine.

                  Section 3. Issue of Right Certificates.

                  (a) Until the earlier of (i) the close of business on the
tenth Business Day after the Stock Acquisition Date or (ii) the close of
business on the tenth Business Day (or such later date as may be determined by
action of the Board of Directors but in no event later than the tenth Business
Day after such time as any Person becomes an Acquiring Person) after the date
that a tender or exchange offer by any Person (other than the Company, any
Subsidiary of the Company, any employee benefit plan or compensation arrangement
of the Company or of any Subsidiary of the Company, or any entity holding
securities of the Company to the extent organized, appointed or established by
the Company or any Subsidiary of the Company for or pursuant to the terms of any
such employee benefit plan or compensation arrangement or any Excepted Person)
is first published or sent or given within the meaning of Rule 14d-2(a) of the
General Rules and Regulations under the Exchange Act, without the Prior Written
Approval of the Company, which tender or exchange offer would result in any
Person becoming the Beneficial Owner of Voting Power aggregating 15% or more of
the outstanding Voting Power


                                       5
<PAGE>   10
(including any such date which is after the date of this Rights Agreement and
prior to the issuance of the Rights; the earlier of such dates being herein
referred to as the "Distribution Date"), (y) the Rights will be evidenced
(subject to the provisions of paragraph (b) of this Section 3) by the
certificates for the Common Stock registered in the names of the holders of the
Common Stock (which certificates for Common Stock shall be deemed also to be
Right Certificates) and not by separate Right Certificates, as more fully set
forth below, and (z) the Rights (and the right to receive certificates therefor)
will be transferable only in connection with the transfer of the underlying
shares of Common Stock, as more fully set forth below. As soon as practicable
after the Company has notified the Rights Agent of the occurrence of the
Distribution Date, the Company shall prepare and execute, and the Rights Agent
shall countersign and send, by first-class, insured, postage prepaid mail, to
each record holder of the Common Stock 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 (the
"Right Certificate"), evidencing one Right for each share of Common Stock so
held, subject to adjustment as provided herein. As of and after 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 Stock,
in substantially the form of Exhibit C hereto (the "Summary of Rights"), by
first-class, postage prepaid mail, to each record holder of the Common Stock 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 the Common Stock
outstanding as of the Record Date, until the Distribution Date (or the earlier
redemption, expiration or termination of the Rights), the Rights will be
evidenced by such certificates for the Common Stock registered in the names of
the holders of the Common Stock and the registered holders of the Common Stock
shall also be registered holders of the associated Rights. Until the
Distribution Date (or the earlier redemption, expiration or termination of the
Rights), the surrender for transfer of any of the certificates for the Common
Stock outstanding in respect of which Rights have been issued shall also
constitute the transfer of the Rights associated with the Common Stock
represented by such certificate.

                  (c) Certificates for the Common Stock issued after the Record
Date but prior to the earlier of the Distribution Date or the redemption,
expiration or termination of the Rights shall be deemed also to be certificates
for Rights and shall have impressed, printed or written on, or otherwise affixed
to them a legend substantially to the following effect:

                  This certificate also evidences and entitles the holder hereof
                  to certain Rights as set forth in a Rights Agreement between
                  Mobile Mini, Inc. (the "Company") and Norwest Bank Minnesota,
                  N.A., as Rights Agent (the "Rights Agreement"), as it may from
                  time to time be supplemented or amended, the terms of which
                  are incorporated herein by reference and a copy of which is on
                  file at the principal executive offices of the Company. Under
                  certain circumstances, as set forth in the Rights Agreement,
                  such Rights may expire or may be redeemed, exchanged or be
                  evidenced by separate certificates and no longer be evidenced
                  by this certificate. The Company will mail to the holder of
                  this certificate a copy of the Rights Agreement without charge
                  promptly after receipt of a written request therefor. Under
                  certain circumstances, Rights issued to or held by Acquiring
                  Persons or


                                       6
<PAGE>   11
                  their Affiliates or Associates (as defined in the Rights
                  Agreement) and any subsequent holder of such Rights may become
                  null and void.

With respect to such certificates containing the foregoing legend, until the
Distribution Date (or the earlier redemption, expiration or termination of the
Rights), the Rights associated with the Common Stock represented by such
certificates shall be evidenced by such certificates alone, and the surrender
for transfer of any of such certificates shall also constitute the transfer of
the Rights associated with the Common Stock represented by such certificates.

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

                  Section 4. Form of Right Certificates.

                  (a) The Right Certificates (and the forms of election to
purchase shares and of assignment to be printed on the reverse thereof) shall be
in substantially the same form 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 Rights Agreement, or as may be required to comply
with any applicable law, rule or regulation 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 customary usage. Subject to the provisions of Section 11 and Section
22 hereof, the Right Certificates, whenever issued, shall be dated as of the
Record Date, and on their face shall entitle the holders thereof to purchase
such number of one one-hundredths of a share of Preferred Stock as shall be set
forth therein at the price per one one-hundredth of a share as set forth therein
(the "Purchase Price"), but the number and identity of such shares and the
Purchase Price shall be and remain subject to adjustment as provided in Sections
11, 13 and 22 hereof.

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


                                       7
<PAGE>   12
                  The Rights represented by this Right Certificate are or were
                  beneficially owned by a Person who was or became an Acquiring
                  Person or an Affiliate or an Associate of an Acquiring Person.
                  Accordingly, this Right Certificate and the Rights represented
                  hereby are void in the circumstances specified in Section 7(e)
                  of the Rights Agreement.

The failure to print the foregoing legend on any such Right Certificate or any
defect therein shall not affect in any manner whatsoever the application or
interpretation of the provisions of Section 7(e) hereof.

                  Section 5. Countersignature and Registration.

                  (a) The Right Certificates shall be executed on behalf of the
Company by its Chairman of the Board, Chief Executive Officer, President, Chief
Financial Officer or any Vice President, either manually or by facsimile
signature, and shall have affixed thereto the Company's seal or a facsimile
thereof which shall be attested by the Secretary or an Assistant Secretary of
the Company, either manually or by facsimile signature. The Right Certificates
shall be countersigned manually or by facsimile signature by the Rights Agent or
the registrar or co-registrar for the Common Stock (the "Registrar") and shall
not be valid for any purpose unless so countersigned. In case any officer of the
Company whose manual or facsimile signature is affixed to the Right Certificates
shall cease to be such officer of the Company before countersignature by the
Rights Agent or the Registrar and issuance and delivery by the Company, such
Right Certificates, nevertheless, may be countersigned by the Rights Agent or
the Registrar, issued and delivered 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. 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 Rights Agreement any such person was not such
an officer.

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

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

                  (a) Subject to the provisions of Section 14 hereof, at any
time after the close of business on the Distribution Date, and at or prior to
the close of business on the Expiration Date (as such term is defined in Section
7(a) hereof), any Right Certificate or Right Certificates may be transferred,
split up, combined or exchanged for another Right Certificate or Right
Certificates, entitling the registered holder to purchase a like number of
shares of Preferred Stock 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 shall
make such request in writing delivered to the Rights Agent, and shall surrender
the Right


                                       8
<PAGE>   13
Certificate or Right Certificates to be transferred, split up, combined or
exchanged at the stockholder services office of the Rights Agent or such office
designated for such purpose. 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.

                  (b) Upon receipt by the Company and the Rights Agent of
evidence reasonably satisfactory to them of the loss, theft, destruction or
mutilation of a Right Certificate, and, in case of loss, theft or destruction,
of indemnity or security reasonably satisfactory to them, and reimbursement to
the Company and the Rights Agent of all reasonable expenses incidental thereto,
and upon surrender to the Rights Agent and cancellation of the Right Certificate
if mutilated, the Company will make and deliver a new Right Certificate of like
tenor to the Rights Agent for countersignature and delivery to the registered
owner 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 stockholder services office of
the Rights Agent or such office designated for such purpose, together with
payment of the Purchase Price for each one-one hundredth of a share of Preferred
Stock as to which the Rights are exercised, at or prior to the close of business
on the Expiration Date. The "Expiration Date", as used in this Rights Agreement,
shall be the earliest of (i) the Final Expiration Date (as defined below), (ii)
the time at which the Rights are redeemed as provided in Section 23 hereof, or
(iii) the time at which the Rights are exchanged as provided in Section 24
hereof. The "Final Expiration Date", as used in this Rights Agreement, shall be
December 30, 2009.

                  (b) The Purchase Price for each one one-hundredth of a share
of Preferred Stock pursuant to the exercise of a Right shall initially be
$80.09, shall be subject to adjustment from time to time as provided in Sections
11 and 13 hereof and shall be payable in lawful money of the United States of
America in accordance with paragraph (c) below.

                  (c) Upon receipt of a Right Certificate, with the form of
election to purchase duly executed, accompanied by payment of the Purchase Price
for each one one-hundredth of a share of Preferred Stock to be purchased and an
amount equal to any applicable transfer tax required to be paid by the holder of
the Rights pursuant hereto in accordance with Section 9 hereof by certified
check, bank draft or money order payable to the order of the Company or the
Rights Agent, the Rights Agent shall, subject to Section 20(k) hereof, thereupon
promptly (i) either (A) requisition from any transfer agent of the shares of
Preferred Stock (or make available, if the Rights Agent is the transfer agent)
certificates for the number of shares of Preferred Stock to be purchased and the
Company hereby irrevocably authorizes any such transfer agent to comply with all
such requests, or (B) if the Company, in its sole discretion, shall have elected
to deposit the shares of Preferred Stock issuable upon exercise of the Rights
hereunder into a depositary, requisition from the depositary agent depositary
receipts representing such number of one one-hundredths of a share of Preferred
Stock as are to be purchased (in which case


                                       9
<PAGE>   14
certificates for the shares of Preferred Stock represented by such receipts
shall be deposited by the transfer agent with the depositary agent) and the
Company hereby directs such depositary agent to comply with all such requests,
(ii) promptly after receipt of such certificates or depositary receipts cause
the same to be delivered to or upon the order of the registered holder of such
Right Certificate, registered in such name or names as may be designated by such
holder, (iii) 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, (iv) after receipt of any such cash, promptly deliver such cash to or
upon the order of the registered holder of such Right Certificate, (v) when
appropriate, requisition from the Company the amount of cash or securities
issuable upon exercise of a Right pursuant to the adjustment provisions of
Section 11 or the exchange provisions of Section 24, and (vi) after receipt of
any such cash or securities, promptly deliver such cash or securities to or upon
the order of the registered holder of such Right Certificate, of any such cash
or securities.

                  (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 such holder's duly authorized assigns, subject to the
provisions of Section 14 hereof.

                  (e) Notwithstanding anything in this Rights Agreement to the
contrary, upon the first occurrence of a Section 11(b) Event or a Section 13
Event, any Rights beneficially owned by (i) an Acquiring Person or an Associate
or Affiliate of an Acquiring Person, (ii) a transferee of an Acquiring Person
(or of any such Associate or Affiliate) which becomes a transferee after the
Acquiring Person becomes such, or (iii) a transferee of an Acquiring Person (or
of any such Associate or Affiliate) which becomes a transferee prior to or
concurrently with the Acquiring Person becoming such and which receives such
Rights pursuant to either (A) a transfer (whether or not for consideration) from
the Acquiring Person (or any such Associate or Affiliate) to holders of equity
interests in such Acquiring Person (or any such Associate or Affiliate) or to
any Person with whom such Acquiring Person (or such Associate or Affiliate) has
any continuing agreement, arrangement or understanding regarding the transferred
Rights, shares of Company Common Stock or the Company or (B) a transfer which a
majority of the Board of Directors has determined to be part of a plan,
arrangement or understanding which has as a primary purpose or effect the
avoidance of this Section 7(e), shall be null and void without any further
action, and no holder of such Rights shall have any rights whatsoever with
respect to such Rights, whether under any provision of this Agreement or
otherwise. The Company shall use all reasonable efforts to ensure that the
provisions of this Section 7(e) and Section 4(b) are complied with, but shall
have no liability to any holder of Rights or any other Person as a result of its
failure to make any determination under this Section 7(e) or Section 4(b) with
respect to an Acquiring Person or its Affiliates, Associates or transferees
hereunder.

                  (f) Notwithstanding anything in this Rights Agreement to the
contrary, neither the Rights Agent nor the Company shall be obligated to
undertake any action with respect to a registered holder upon the occurrence of
any purported exercise as set forth in this Section 7 unless the certificate
contained in the appropriate form of election to purchase set forth on the
reverse side of the Right Certificate surrendered for such exercise shall have
been properly completed and duly executed by the registered holder thereof and
the Company shall have been


                                       10
<PAGE>   15
provided with such additional evidence of the identity of the Beneficial Owner
(or former Beneficial Owner) or Affiliates or Associates thereof as the Company
shall reasonably request.

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

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

                  (a) The Company covenants and agrees that it will cause to be
reserved and kept available out of its authorized and unissued shares of
Preferred Stock or its authorized and issued shares of Preferred Stock held in
its treasury, the number of shares of Preferred Stock that will be sufficient to
permit the exercise in full of all outstanding Rights and, after the occurrence
of a Section 11(b) Event or a Section 13 Event, shall so reserve and keep
available a sufficient number of shares of Preferred Stock, Common Stock and/or
other securities which may be required to permit the exercise in full of the
Rights pursuant to this Rights Agreement.

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

                  (c) The Company shall use its best efforts to (i) file, as
soon as practicable following the first occurrence of an event which would
establish the Distribution Date, a registration statement under the Securities
Act of 1933, as amended (the "Securities Act"), with respect to the securities
purchasable upon exercise of the Rights on an appropriate form, (ii) cause such
registration statement to become effective as soon as practicable after such
filing, and (iii) cause such registration statement to remain effective (with a
prospectus at all times meeting the requirements of the Securities Act) until
the Expiration Date. The Company will also take such action as may be
appropriate under the "blue sky laws" of the various states.

                  (d) The Company further covenants and agrees that it will pay
when due and payable any and all federal and state transfer taxes and charges
which may be payable in respect of the issuance or delivery of the Right
Certificates or of any shares of Preferred Stock and/or other securities upon
the exercise of Rights. The Company shall not, however, be required to pay any
transfer tax which may be payable in respect of any transfer involved in the
transfer or delivery of Right Certificates or the issuance or delivery of
certificates or depositary receipts for Preferred Stock and/or other securities
in a name other than that of the registered holder of the Right Certificate
evidencing Rights surrendered for exercise, nor shall the Company be required


                                       11
<PAGE>   16
to issue or deliver any certificates or depositary receipts for shares of
Preferred Stock and/or other securities 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 satisfaction that no such tax is due.

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

                  Section 11. Adjustment of Purchase Price, Number of Shares or
Number of Rights. The Purchase Price, the number and identity of 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) In the event the Company shall at any time after the date
of this Rights Agreement (i) declare a dividend on the Preferred Stock payable
in shares of Preferred Stock, (ii) subdivide the outstanding Preferred Stock,
(iii) combine the outstanding Preferred Stock into a smaller number of shares or
(iv) issue any shares of its capital stock in a reclassification of the
Preferred Stock (including any such reclassification in connection with a
consolidation or merger in which the Company is the continuing or surviving
corporation), except as otherwise provided in this Section 11, the Purchase
Price in effect at the time of the record date for such dividend or the time of
the effective date of such subdivision, combination or reclassification, and the
number and kind of shares of capital stock, including Preferred Stock, issuable
upon exercise of a Right, shall be proportionately adjusted so that the holder
of any Right exercised after such time, upon payment of the aggregate
consideration such holder would have had to pay to exercise such Right prior to
such time, shall be entitled to receive the aggregate number and kind of shares
of capital stock, including Preferred Stock, which, if such Right had been
exercised immediately prior to such date and at a time when the Preferred Stock
transfer books of the Company were open, such holder would have owned upon such
exercise and been entitled to receive by virtue of such dividend, subdivision,
combination or reclassification.

                  (b) In the event any Person becomes an Acquiring Person
("Section 11(b) Event"), then proper provision shall be made so that each holder
of a Right, subject to Section 7(e) and Section 24 hereof and except as provided
below, shall after the later of the occurrence of such event and the effective
date of an appropriate registration statement pursuant to Section 9 hereof, have
a right to receive, upon exercise thereof at the then current Purchase Price,


                                       12
<PAGE>   17
multiplied by the then number of one-one hundredths of a share of Preferred
Stock for which a Right is then exercisable, in accordance with the terms of
this Rights Agreement, in lieu of shares of Preferred Stock, such number of
shares of Common Stock of the Company as shall equal the result obtained by (y)
multiplying the then current Purchase Price by the then number of one
one-hundredths of a share of Preferred Stock for which a Right is then
exercisable and dividing that product by (z) 50% of the current market price per
one share of Common Stock (determined pursuant to Section 11(f) hereof on the
date of the occurrence of the Section 11(b) Event) (such number of shares being
referred to as the "number of Adjustment Shares").

                  (c) In the event that there shall not be sufficient Treasury
shares or authorized but unissued shares of Common Stock to permit the exercise
in full of the Rights in accordance with the foregoing Section 11(b), and the
Rights become so exercisable, notwithstanding any other provision of this Rights
Agreement, to the extent necessary and permitted by applicable law and any
agreements in effect on the date hereof to which the Company is a party, each
Right shall thereafter represent the right to receive, upon exercise thereof at
the then current Purchase Price, multiplied by the then number of one-one
hundredths of a share of Preferred Stock for which a Right is then exercisable,
in accordance with the terms of this Rights Agreement, a number of shares, or
units of shares, of (y) Common Stock, and (z) preferred stock (or other equity
securities) of the Company, including, but not limited to Preferred Stock, equal
in the aggregate to the number of Adjustment Shares where the Board of Directors
shall have in good faith deemed such shares or units, other than the shares of
Common Stock, to have at least the same value and voting rights as the Common
Stock (a "common stock equivalent"); provided, however, if there are unavailable
sufficient shares (or fractions of shares) of Common Stock and/or common stock
equivalents, then the Company shall take all such action as may be necessary to
authorize additional shares of Common Stock or common stock equivalents for
issuance upon exercise of the Rights, including the calling of a meeting of
stockholders; and provided, further, that if the Company is unable to cause
sufficient shares of Common Stock and/or common stock equivalents to be
available for issuance upon exercise in full of the Rights, then the Company, to
the extent necessary and permitted by applicable law and any agreements or
instruments in effect on the date thereof to which it is a party, shall make
provision to pay an amount in cash equal to twice the Purchase Price (as
adjusted pursuant to this Section 11), in lieu of issuing shares of Common Stock
and/or common stock equivalents. To the extent that the Company determines that
some action needs to be taken pursuant to this Section 11(c), the Board of
Directors by action of at least a majority of its members then in office may
suspend the exercisability of the Rights for a period of up to sixty (60) days
following the date on which the Section 11(b) Event shall have occurred, in
order to decide the appropriate form of distribution to be made pursuant to this
Section 11(c) and to determine the value thereof. In the event of any such
suspension, the Company shall issue a public announcement stating that the
exercisability of the Rights has been temporarily suspended. The Board of
Directors may, but shall not be required to, establish procedures to allocate
the right to receive Common Stock and common stock equivalents upon exercise of
the Rights among holders of Rights, which such allocation may be, but is not
required to be, pro-rata.

                  (d) If the Company shall fix a record date for the issuance of
rights or warrants to all holders of Preferred Stock entitling them (for a
period expiring within 90 calendar days after such record date) to subscribe for
or purchase Preferred Stock (or securities having the same or more favorable
rights, privileges and preferences as the Preferred Stock ("equivalent


                                       13
<PAGE>   18
preferred stock")) or securities convertible into Preferred Stock or equivalent
preferred stock, at a price per share of Preferred Stock or per share of
equivalent preferred stock or having a conversion or exercise price per share,
as the case may be, less than the current market price per share of Preferred
Stock (as defined in Section 11(f) 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 date by a fraction, the
numerator of which shall be the number of shares of Preferred Stock outstanding
on such record date plus the number of shares of Preferred Stock which the
aggregate offering price of the total number of shares of Preferred Stock or
equivalent preferred stock to be offered (and/or the aggregate initial
conversion price of the convertible securities so to be offered) would purchase
at such current market price, and the denominator of which shall be the number
of shares of Preferred Stock outstanding on such record date plus the number of
additional shares of Preferred Stock and/or equivalent preferred stock to be
offered for subscription or purchase (or into which the convertible securities
so to be offered are initially convertible). In case such subscription price may
be paid in a consideration, part or all of which shall be in a form other than
cash, the value of such consideration shall be as determined in good faith by a
majority of the Board of Directors, whose determination shall be described in a
statement filed with the Rights Agent. Shares of Preferred Stock owned by or
held for the account of the Company shall not be deemed outstanding for the
purpose of any such computation. Such adjustment shall be made successively
whenever such a record date is fixed; and in the event that such rights or
warrants are not so issued, the Purchase Price shall be adjusted to be the
Purchase Price which would then be in effect if such record date had not been
fixed.

                  (e) If the Company shall fix a record date for the making of a
distribution to all holders of Preferred Stock (including any such distribution
made in connection with a consolidation or merger in which the Company is the
continuing or surviving corporation) of evidences of indebtedness, cash (other
than a regular periodic cash dividend out of earnings or retained earnings of
the Company), assets (other than a dividend payable in Preferred Stock, but
including any dividend payable in stock other than Preferred Stock) or
convertible securities, subscription rights or warrants (excluding those
referred to in Section 11(d) hereof), the Purchase Price to be in effect after
such record date shall be determined by multiplying the Purchase Price in effect
immediately prior to such record date by a fraction, the numerator of which
shall be the current market price for one share of Preferred Stock (as defined
in Section 11(f) hereof) on such record date less the fair market value (as
determined in good faith by a majority of 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 convertible securities, subscription rights or warrants applicable to
one share of Preferred Stock, and the denominator of which shall be such current
market price for one share of Preferred Stock. Such adjustments shall be made
successively whenever such a record date is fixed; and in the event that such
distribution is not so made, the Purchase Price shall again be adjusted to be
the Purchase Price which would then be in effect if such record date had not
been fixed.

                  (f) (i) For the purpose of any computation hereunder, the
         "current market price" of any security (a "Security" for purposes of
         this Section 11(f)(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 hereinafter defined) immediately prior to
         such date; provided, however, that in the event that the current market
         price per share of such


                                       14
<PAGE>   19
         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 shares of such Security 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 market
         price" shall be appropriately adjusted to reflect the current market
         price per share equivalent of such Security. The closing price for each
         day shall be the last sale price, regular way, or, in case no such sale
         takes place on such day, the average of the closing bid and asked
         prices, regular way, in either case as reported in the principal
         consolidated transaction reporting system with respect to securities
         listed or admitted to trading on the New York Stock Exchange or, if the
         Security is not listed or admitted to trading on the New York Stock
         Exchange, as reported in the principal consolidated transaction
         reporting system with respect to securities listed or admitted to
         trading 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, as
         reported by the National Association of Securities Dealers, Inc.
         Automated Quotation System ("Nasdaq") National Market System, or if the
         Security is not listed or admitted to trading on any national
         securities exchange or included in the Nasdaq National Market System,
         the average of the high bid and low asked prices in the
         over-the-counter market, as reported by Nasdaq or such other system
         then in use, or, if on any such date the Security is not quoted by any
         such organization, the average of the closing bid and asked prices as
         furnished by a professional market maker making a market in the
         Security selected by a majority of the Board of Directors. If on any
         such date no market maker is making a market in the Security, the fair
         value of such Security on such date as determined in good faith by a
         majority of the Board of Directors shall be used. 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 day on which
         the Nasdaq National Market System is open for the transaction of
         business or, if the Security is not listed or admitted to trading on
         any national securities exchange or included in the Nasdaq National
         Market System, a Business Day. If the Security is not publicly held or
         not so listed or traded, "current market price" shall mean the fair
         value as determined in good faith by a majority of the Board of
         Directors, whose determination shall be described in a statement filed
         with the Rights Agent.

                           (ii) For the purpose of any computation hereunder,
         the "current market price" per share (or one one-hundredth of a share)
         of Preferred Stock shall be determined in the same manner as set forth
         above for the Common Stock in clause (i) of this Section 11(f) (other
         than the last sentence thereof). If the current market price per share
         (or one one-hundredth of a share) of Preferred Stock cannot be
         determined in the manner provided above or if the Preferred Stock is
         not publicly held or listed or traded in a manner described in clause
         (i) of this Section 11(f), the "current market price" per share of
         Preferred Stock shall be conclusively deemed to be an amount equal to
         100 (as such number may be appropriately adjusted for such events as
         stock splits, stock dividends and recapitalizations with respect to the
         Common Stock occurring after the date of this Rights


                                       15
<PAGE>   20
         Agreement) multiplied by the current market price per share of the
         Common Stock and the "current market price" per one one-hundredth of a
         share of Preferred Stock shall be equal to the current market price per
         share of the Common Stock (as appropriately adjusted). If neither the
         Common Stock nor the Preferred Stock is publicly held or so listed or
         traded, "current market price" per share 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 and shall be conclusive for all purposes.

                  (g) No adjustment in the Purchase Price shall be required
unless such adjustment would require an increase or decrease of at least 1% in
the Purchase Price; provided, however, that any adjustments which by reason of
this Section 11(g) are not required to be made shall be carried forward and
taken into account in any subsequent adjustment. All calculations under this
Section 11 shall be made to the nearest cent or to the nearest ten-thousandth of
a share, as the case may be. Notwithstanding the first sentence of this Section
11(g), 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 mandates
such adjustment or (ii) the Expiration Date.

                  (h) In the event that at any time, as a result of an
adjustment made pursuant to Section 11(a) or (b) hereof, the holder of any Right
shall be entitled to receive upon exercise of such Right any shares of capital
stock of the Company other than shares of Preferred Stock, thereafter the number
of such other shares so receivable upon exercise of any Right shall be subject
to adjustment from time to time in a manner and on terms as nearly equivalent as
practicable to the provisions with respect to the shares contained in Section
11(a) through (e) hereof, inclusive, and the provisions of Sections 7, 9, 10, 13
and 14 hereof with respect to the shares of Preferred Stock shall apply on like
terms to any such other shares.

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

                  (j) Unless the Company shall have exercised its election as
provided in Section 11(k) hereof, upon each adjustment of the Purchase Price as
a result of the calculations made in Section 11(d) and (e) hereof, each Right
outstanding immediately prior to the making of such adjustment shall thereafter
evidence the right to purchase, at the adjusted Purchase Price, that number of
one one-hundredths of a share of Preferred Stock (calculated to the nearest
ten-thousandth) obtained by (i) multiplying (A) the number of one one-hundredths
of a share of Preferred Stock covered by a Right immediately prior to the
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.

                  (k) 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 shares of Preferred Stock 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


                                       16
<PAGE>   21
one one-hundredths of a share of Preferred Stock for which such 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 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(k), the
Company shall, as promptly as practicable, cause to be distributed to holders of
record of Right Certificates on such record date Right Certificates evidencing,
subject to Section 14 hereof, the additional Rights to which such holders shall
be entitled as a result of such adjustment, or, at the option of the Company,
shall cause to be distributed to such holders of record in substitution and
replacement for the Right Certificates held by 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 may bear, at
the option of the Company, the adjusted Purchase Price) and shall be registered
in the names of the holders of record of Right Certificates on the record date
specified in the public announcement.

                  (l) Irrespective of any adjustment or change in the Purchase
Price or the number of shares of Preferred Stock 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 shares which were
expressed in the initial Right Certificates issued hereunder.

                  (m) Before taking any action that would cause an adjustment
reducing the Purchase Price below the then par value, if any, of the shares of
Common Stock or other securities and below one one-hundredth of the then par
value, if any, of the Preferred Stock, issuable upon exercise of the Rights, the
Company shall take any corporate action which may, in the opinion of its
counsel, be necessary in order that the Company may validly and legally issue
fully paid and nonassessable shares of such Preferred Stock, Common Stock or
other securities at such adjusted Purchase Price. If upon any exercise of the
Rights, a holder is to receive a combination of Common Stock and common stock
equivalents, a portion of the consideration paid upon such exercise, equal to at
least the then par value of a share of Common Stock of the Company, shall be
allocated as the payment for each share of Common Stock of the Company so
received.

                  (n) 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
the shares of Preferred Stock and other capital stock or securities of the
Company, if any, issuable upon such exercise over and above the shares of
Preferred Stock and other capital stock or securities of the Company, if any,
issuable upon such exercise on the basis of the Purchase Price in effect prior
to such adjustment; provided, however, that the Company shall deliver to such
holder a due bill or other appropriate instrument evidencing such holder's


                                       17
<PAGE>   22
right to receive such additional shares upon the occurrence of the event
requiring such adjustment.

                  (o) 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 in their good faith judgment a majority of
the Board of Directors shall determine to be advisable in order that any (i)
consolidation or subdivision of the Preferred Stock, (ii) issuance wholly for
cash of any Preferred Stock at less than the then current market price, (iii)
issuance wholly for cash of Preferred Stock or securities which by their terms
are convertible into or exchangeable for Preferred Stock, (iv) stock dividends
or (v) issuance of rights, options or warrants referred to hereinabove in this
Section 11, hereafter made by the Company to the holders of its Preferred Stock,
shall not be taxable to such stockholders.

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

                  (q) The Company covenants and agrees that it shall not, at any
time after the Distribution Date and so long as the Rights have not been
redeemed pursuant to Section 23 hereof or exchanged pursuant to Section 24
hereof, (i) consolidate with, (ii) merge with or into, or (iii) sell or
transfer, in one or more transactions, assets or earning power aggregating more
than 50% of the assets or earning power of the Company and its Subsidiaries
(taken as a whole) to, any other Person, if at the time of or immediately after
such consolidation, merger or sale there are any rights, warrants or other
instruments or securities outstanding or agreements in effect which would
substantially diminish or otherwise eliminate the benefits intended to be
afforded by the Rights.

                  (r) The Company covenants and agrees that, after the Stock
Acquisition Date, it will not, except as permitted by Sections 23 and 24 hereof,
take any action the purpose or effect of which is to diminish substantially or
otherwise eliminate the benefits intended to be afforded by the Rights.

                  Section 12. Certificate of Adjusted Purchase Price or Number
of Shares. Whenever an adjustment is made as provided in Sections 11 or 13
hereof, the Company shall (a)


                                       18
<PAGE>   23
promptly prepare a certificate setting forth such adjustment, and a brief
statement of the facts accounting for such adjustment, (b) promptly file with
the Rights Agent and with each transfer agent for the Preferred Stock and the
Common Stock a copy of such certificate and (c) include a brief summary thereof
in a mailing to each holder of a Right Certificate in accordance with Section 26
hereof, or prior to the Distribution Date, disclose a brief summary in a filing
under the Exchange Act. The Rights Agent shall be fully protected in relying on
any such certificate and on any adjustments therein contained.

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

                  (a) In the event that, directly or indirectly, at any time
after a Person has become an Acquiring Person, (x) the Company shall consolidate
with, or merge with and into, any other Person, (y) any Person shall consolidate
with 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 Common Stock 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 (z) 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 to 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, subject to Section 7(e) hereof, shall
thereafter have the right to receive, upon the exercise thereof at the then
current Purchase Price multiplied by the then number of one-one hundredths of a
share of Preferred Stock for which a Right is then exercisable (or if a Section
11(b) Event has occurred prior to the first occurrence of a Section 13 Event,
multiplying the number of such one one-hundredths of a share for which a Right
was exercisable immediately prior to the first occurrence of a Section 11(b)
Event by the Purchase Price in effect immediately prior to such first
occurrence) in accordance with the terms of this Rights Agreement, in lieu of
Preferred Stock, such number of shares of freely tradable Common Stock of the
Principal Party (as hereinafter defined), free and clear of liens, rights of
call or first refusal, encumbrances or other adverse claims, as shall be equal
to the result obtained by (A) multiplying the then current Purchase Price by the
number of one one-hundredths of a share of Preferred Stock for which a Right is
then exercisable (or if a Section 11(b) Event has occurred prior to the first
occurrence of a Section 13 Event, multiplying the number of such one
one-hundredths of a share for which a Right was exercisable immediately prior to
the first occurrence of a Section 11(b) Event by the Purchase Price in effect
immediately prior to such first occurrence), and dividing that product by (B)
50% of the current market price per share of the Common Stock of such Principal
Party (determined in the manner described in Section 11(f) hereof) on the date
of consummation of such consolidation, merger, sale or transfer; (ii) the
Principal Party shall thereafter be liable for, and shall assume, by virtue of
such consolidation, merger, sale or transfer, all the obligations and duties of
the Company pursuant to this Rights Agreement; (iii) the term "Company" shall
thereafter be deemed to refer to such Principal Party, it being specifically
intended that the provisions of Section 11 hereof, except for the provisions of
11(b), shall apply to such Principal Party; and (iv) such Principal Party shall
take such steps (including, but not limited to, the authorization and
reservation of a sufficient number of shares of its Common Stock to permit
exercise of all outstanding Rights in accordance with this Section 13(a)) in
connection with such


                                       19
<PAGE>   24
consummation as may be necessary to assure that the provisions hereof shall
thereafter be applicable, as nearly as reasonably may be, in relation to the
shares of its Common Stock thereafter deliverable upon the exercise of the
Rights.

                  (b) "Principal Party" shall mean:

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

                           (ii) in the case of any transaction described in
         clause (z) of the first sentence of Section 13(a) hereof, the Person
         that is the party receiving the greatest portion of the assets or
         earning power transferred pursuant to such transaction or transactions;
         provided, however, that in any case described in clause (i) or (ii) in
         this Section 13(b), (x) if the Common Stock of such Person is not at
         such time and has not been continuously over the preceding 12-month
         period registered under Section 12 of the Exchange Act, and such Person
         is a direct or indirect Subsidiary or Affiliate of another Person,
         "Principal Party" shall refer to such other Person; (y) in case such
         Person is a Subsidiary, directly or indirectly, or Affiliate of more
         than one Person, the Common Stocks of all of which are and have been so
         registered, "Principal Party" shall refer to whichever of such Persons
         is the issuer of the Common Stock having the greatest aggregate market
         value, and (z) in case such Person is, or is owned directly or
         indirectly by, a partnership or joint venture formed by two or more
         Persons that are not owned, directly or indirectly, by the same Person,
         the rules set forth in (x) and (y) above shall apply to each of the
         chains of ownership having an interest in such joint venture as if such
         party were a "Subsidiary" of both or all of such joint venturers and
         the Principal Parties in each such chain shall bear the obligations set
         forth in this Section 13 in the same ratio as their direct or indirect
         interests in such Person bear to the total of such interests.

                  (c) The Company shall not consummate any such consolidation,
merger, sale or transfer unless the Principal Party shall have a sufficient
number of shares of its authorized Common Stock which have not been issued or
reserved for issuance to permit the exercise in full of the Rights in accordance
with this Section 13 and unless prior thereto the Company and each Principal
Party and each other Person who may become a Principal Party as a result of such
consolidation, merger, sale or transfer shall have executed and delivered to the
Rights Agent a supplemental agreement providing for the terms set forth in
paragraphs (a) and (b) of this Section 13 and further providing that, as soon as
practicable after the date of any consolidation, merger, sale or transfer of
assets mentioned in paragraph (a) of this Section 13, the Principal Party will:

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



                                       20
<PAGE>   25
                           (ii) use its best efforts to qualify or register the
         Rights and the securities purchasable upon exercise of the Rights under
         the "blue sky laws" of such jurisdictions as may be necessary or
         appropriate; and

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

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

                  Section 14. Fractional Rights and Fractional Shares.

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

                  (b) The Company shall not be required to issue fractions of
shares of Preferred Stock (other than fractions which are integral multiples of
one one-hundredth of a share of Preferred Stock) upon exercise of the Rights or
to distribute certificates which evidence fractional shares of Preferred Stock
(other than fractions which are integral multiples of one one-hundredth of a
share of Preferred Stock). Fractions of shares of Preferred Stock in integral
multiples of one one-hundredth of a share of Preferred Stock may, at the
election of the Company, be evidenced by depositary receipts, pursuant to an
appropriate agreement between


                                       21
<PAGE>   26
the Company and a depositary selected by it, provided that such agreement shall
provide that the holders of such depositary receipts shall have all the rights,
privileges and preferences to which they are entitled as beneficial owners of
the shares of Preferred Stock represented by such depositary receipts. In lieu
of fractional shares of Preferred Stock that are not integral multiples of one
one-hundredth of a share of Preferred Stock, the Company may pay to the
registered holders of Right Certificates at the time such Right Certificates are
exercised as herein provided an amount in cash equal to the same fraction of the
current market value of one one-hundredths of a share of Preferred Stock. For
purposes of this Section 14(b), the current market value of one one-hundredth of
a share of Preferred Stock shall be one one-hundredth of the closing price of a
share of Preferred Stock (as determined pursuant to Section 11(f)(ii) hereof)
for the Trading Day immediately prior to the date of such exercise.

                  (c) Following the occurrence of one of the transactions or
events specified in Section 11 hereof giving rise to the right to receive common
stock equivalents (other than Preferred Stock) or other securities upon the
exercise of a Right, the Company shall not be required to issue fractions of
shares or units of such common stock equivalents or other securities upon
exercise of the Rights or to distribute certificates which evidence fractional
shares of such common stock equivalents or other securities. In lieu of
fractional shares or units of such common stock equivalents or other securities,
the Company may 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 a share or unit of such common stock
equivalent or other securities. For purposes of this Section 14(c), the current
market value shall be determined in the manner set forth in Section 11(f) hereof
for the Trading Day immediately prior to the date of such exercise and, if such
common stock equivalent is not traded, each such common stock equivalent shall
have the value of one one-hundredth of a share of Preferred Stock.

                  (d) Except as otherwise expressly provided in this Section 14,
the holder of a Right by the acceptance of the Right expressly waives such
holder's right to receive any fractional Rights or any fractional share upon
exercise of Rights.

                  Section 15. Rights of Action. All rights of action in respect
of this Rights Agreement, except for rights of action given to the Rights Agent
under Section 18 or Section 20 hereof, are vested in the respective registered
holders of the Right Certificates (and, prior to the Distribution Date, the
registered holders of Common Stock); and any registered holder of any Right
Certificate (or, prior to the Distribution Date, of the Common Stock), 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 Stock), may, in such holder's
own behalf and for such holder's own benefit, enforce, and may institute and
maintain any suit, action or proceeding against the Company to enforce, or
otherwise act in respect of, such holder's right to exercise the Rights
evidenced by such Right Certificate in the manner provided in such Right
Certificate and in this Rights Agreement. Without limiting the foregoing or any
remedies available to the holders of Rights, it is specifically acknowledged
that the holders of Rights would not have an adequate remedy at law for any
breach of this Rights Agreement and 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 Rights Agreement.
Holders of Rights shall be entitled to recover the reasonable costs and
expenses, including attorneys' fees, incurred by them in any action to enforce
the provisions of this Rights Agreement.



                                       22
<PAGE>   27
                  Section 16. Agreement of Right Holders. Every holder of a
Right by accepting the same consents and agrees with the Company and the Rights
Agent and with every other holder of a Right that:

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

                  (b) after the Distribution Date, the Right Certificates are
transferable only on the registry books of the Rights Agent if surrendered at
the stockholder services office of the Rights Agent or such office designated
for such purpose, 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 Stock Certificate) is registered as the absolute owner
thereof and of the Rights evidenced thereby (notwithstanding any notations of
ownership or writing on the Right Certificate or the associated Common Stock
certificate made by anyone other than the Company or the Rights Agent) for all
purposes whatsoever, and neither the Company nor the Rights Agent shall be
affected by any notice to the contrary.

                  Section 17. Right Certificate Holder Not Deemed a Stockholder.
No holder, as such, of any Right Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of Preferred Stock, Common
Stock or any other securities of the Company which may at any time be issuable
on the exercise of the Rights represented thereby, nor shall anything contained
herein or in any Right Certificate be construed to confer upon the holder of any
Right Certificate, as such, any of the rights of a stockholder of the Company or
any right to vote for the election of directors or upon any matter submitted to
stockholders at any meeting thereof, or to give or withhold consent to any
corporate action, or to receive notice of meetings or other actions affecting
stockholders (except as provided in 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.

                  (a) The Company agrees to pay to the Rights Agent reasonable
compensation for all services rendered by it hereunder and, from time to time,
on demand of the Rights Agent, its reasonable expenses and counsel fees and
other disbursements incurred in the administration and execution of this Rights
Agreement and the exercise and performance of its duties hereunder. 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
Rights Agreement, including the costs and expenses of defending against any
claim of liability.

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


                                       23
<PAGE>   28
power of attorney, endorsement, affidavit, letter, notice, direction, consent,
certificate, statement, or other paper or document believed by it to be genuine
and to be signed, executed and, where necessary, verified or acknowledged, by
the proper Person or Persons.

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

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

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

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

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

                  (b) Whenever in the performance of its duties under this
Rights 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 the Chairman of
the Board, Chief Executive Officer, President, Chief Financial Officer or any
Vice President and by the Treasurer or any Assistant Treasurer or the Secretary
or any Assistant Secretary of the Company and


                                       24
<PAGE>   29
delivered to the Rights Agent; and such certificate shall be full authorization
to the Rights Agent for any action taken or suffered in good faith by it under
the provisions of this Rights Agreement in reliance upon such certificate.

                  (c) The Rights Agent shall be liable hereunder only for its
own 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 Rights 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 Rights Agreement or the execution and delivery
hereof (except the due execution hereof by the Rights Agent) or in respect of
the validity or execution of any Right Certificate (except its countersignature
thereof); nor shall it be responsible for any breach by the Company of any
covenant or condition contained in this Rights Agreement or in any Right
Certificate; nor shall it be responsible for any adjustment required under the
provisions of Sections 11 or 13 hereof or responsible for the manner, method or
amount of any such adjustment or the ascertaining of the existence of facts that
would require any such adjustment (except with respect to the exercise of Rights
evidenced by Right Certificates after actual notice to the Rights Agent of any
such adjustment); nor shall it by any act hereunder be deemed to make any
representation or warranty as to the authorization or reservation of any shares
of Preferred Stock or other securities to be issued pursuant to this Rights
Agreement or any Right Certificate or as to whether any shares of Preferred
Stock or other securities 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 Rights Agreement.

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

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



                                       25
<PAGE>   30
                  (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 that reasonable care was exercised
in the selection and continued employment thereof.

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

                  (k) If, with respect to any Rights Certificate surrendered to
the Rights Agent for exercise or transfer, the certificate attached to the form
of assignment or form of election to purchase, as the case may be, has either
not been completed or indicates an affirmative response to clause 1, clause 2
and/or, in the case of the certificate attached to the form of election to
purchase, clause 3 thereof, the Rights Agent shall not take any further action
with respect to such requested exercise of transfer without first consulting
with the Company.

                  Section 21. Change of Rights Agent. The Rights Agent or any
successor Rights Agent may resign and be discharged from its duties under this
Rights Agreement upon 30 days' notice in writing mailed to the Company and to
each transfer agent of the Common Stock and Preferred Stock by registered or
certified mail, and to the holders of the 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 Stock and
Preferred Stock by registered or certified mail, and to the holders of the Right
Certificates by first-class mail or, prior to the Distribution Date, through any
filing made by the Company pursuant to the Exchange Act. 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 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
(which holder shall, with such notice, submit such holder's Right Certificate
for inspection by the Company), then the registered holder of any Right
Certificate may apply to any court of competent jurisdiction for the appointment
of a new Rights Agent. Any successor Rights Agent, whether appointed by the
Company or by such a court, shall be (a) a corporation or other entity organized
and doing business under the laws of the United States or of any state, in good
standing, having an office in the States of New York or Arizona, 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, or
(b) an affiliate of a corporation or other entity described in clause (a) of
this sentence. After appointment, the successor Rights Agent shall be vested
with the same powers, rights, duties and responsibilities as if it had been
originally named as Rights Agent without further act or deed; but the
predecessor Rights Agent shall deliver and transfer to the successor Rights
Agent any property at the time held by it hereunder, and 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


                                       26
<PAGE>   31
Common Stock and Preferred Stock, and mail a notice thereof in writing to the
registered holders of the Right Certificates or, prior to the Distribution Date,
through any filing made by the Company pursuant to the Securities Exchange Act
of 1934, as amended. Failure to give any notice provided for 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.

                  (a) Notwithstanding any of the provisions of this Rights
Agreement or of the Rights to the contrary, the Company may, at its option,
issue new Right Certificates evidencing Rights in such form as may be approved
by a majority of the Board of Directors then in office to reflect any adjustment
or change in the Purchase Price and the number or kind or class of shares of
stock or other securities or property purchasable under the Right Certificates
made in accordance with the provisions of this Rights Agreement.

                  (b) In addition, in connection with the issuance or sale of
Common Stock following the Distribution Date and prior to the redemption,
exchange or expiration of the Rights, the Company (a) shall with respect to
shares of Common Stock so issued or sold pursuant to the exercise of stock
options or under any employee benefit plan or arrangement, or upon the exercise,
conversion or exchange of securities hereinafter issued by the Company, and (b)
may, in any other case, if deemed necessary or appropriate by the Board of
Directors, issue Right Certificates representing the appropriate number of
Rights in connection with such issuance or sale; provided, however, that (i) no
such Right Certificates shall be issued if, and to the extent that, the Company
shall be advised by counsel that such issuance would create a significant risk
of material adverse tax consequences to the Company or the Person to whom such
Right Certificates would be issued, and (ii) no Right Certificate shall be
issued if, and to the extent that, appropriate adjustment shall otherwise have
been made in lieu of the issuance thereof.

                  Section 23. Redemption and Termination.

                  (a) A majority of the Board of Directors then in office may,
at its option, at any time prior to the earlier of (i) the close of business on
the Stock Acquisition Date or (ii) the close of business on the Final Expiration
Date, elect to redeem all but not less than all of the then outstanding Rights
at a redemption price of $0.01 per Right, as 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 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 a majority of the Board of
Directors then in office electing to redeem the Rights, evidence of which shall
be promptly filed with the Rights Agent, or, when appropriate, immediately upon
the time or satisfaction of such conditions as the Board of Directors may have
established, 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 disclosure of any such redemption; provided, however, that the
failure to give, or any defect in,


                                       27
<PAGE>   32
any such disclosure shall not affect the validity of such redemption. Within 10
days after the action of the Board of Directors ordering the redemption of the
Rights, the Company shall give notice of such redemption to the holders of the
then outstanding Rights by mailing such notice to all such holders at their last
addresses as they appear upon the registry books of the Rights Agent or, prior
to the Distribution Date, on the registry books of the Transfer Agent for the
Common Stock. Any notice which is mailed in the manner herein provided shall be
deemed given, whether or not the holder receives the notice. Each such notice of
redemption will state the method by which the payment of the Redemption Price
will be made.

                  (c) 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, Section 24
hereof and other than in connection with the purchase of Common Stock 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 7(e) hereof) for Common Stock
at an exchange ratio of one share of Common Stock per Right, appropriately
adjusted to reflect adjustments in the number of Rights pursuant to Section 11
of this Rights Agreement (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 or compensation arrangement of the Company or any such Subsidiary, or any
entity holding securities of the Company to the extent organized, appointed or
established by the Company or any such Subsidiary for or pursuant to the terms
of any such employee benefit plan or compensation arrangement or any Excepted
Person), together with all Affiliates and Associates of such Person, becomes the
Beneficial Owner of 50% or more of the Voting Power of the Company.

                  (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 that number of shares of Common Stock equal to the
number of such Rights held by such holder multiplied by the Exchange Ratio. The
Company promptly shall give public notice of any such exchange; provided,
however, that the failure to give, or any defect in, such notice shall not
affect the validity of such exchange. The Company 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
which is mailed in the manner herein provided shall be deemed given, whether or
not the holder receives the notice. Each such notice of exchange will state the
method by which the exchange of Common Stock for Rights will be effected and, in
the event of any partial exchange, the number of Rights which will be exchanged.
Any partial exchange shall be effected pro rata based on the number of Rights
(other than Rights which have become void pursuant to the provisions of Section
7(e) hereof) held by each holder of Rights.



                                       28
<PAGE>   33
                  (c) In any exchange pursuant to this Section 24, the Company,
at its option, may substitute Preferred Stock (or equivalent preferred stock, as
such term is defined in Section 11(d) hereof) for Common Stock exchangeable for
Rights, at the initial rate of one one-hundredth of a share of Preferred Stock
(or equivalent preferred stock) for each share of Common Stock, as appropriately
adjusted to reflect adjustments in the voting rights of the Preferred Stock
pursuant to the terms thereof, so that the fraction of a share of Preferred
Stock delivered in lieu of each share of Common Stock shall have the same voting
rights as one share of Common Stock.

                  (d) In the event that there shall not be sufficient shares of
Common Stock or Preferred Stock (or equivalent preferred stock) issued but not
outstanding or 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 shares of Common Stock or
Preferred Stock (or equivalent preferred stock) for issuance upon exchange of
the Rights.
                  (e) The Company shall not be required to issue fractions of
Common Stock or to distribute certificates which evidence fractional shares of
Common Stock. In lieu of such fractional shares of Common Stock, the Company
shall pay to the registered holders of the Right Certificates with regard to
which such fractional shares of Common Stock would otherwise be issuable an
amount in cash equal to the same fraction of the current market value of a whole
share of Common Stock. For the purposes of this paragraph (e), the current
market value of a whole share of Common Stock shall be the closing price of a
share of Common Stock (as determined pursuant to the second sentence of Section
11(f)(i) hereof) for the Trading Day immediately prior to the date of exchange
pursuant to this Section 24.

                  Section 25. Notice of Proposed Actions.

                  (a) In case the Company shall propose at any time after the
Distribution Date (a) to pay any dividend payable in stock of any class to the
holders of the Preferred Stock or to make any other distribution to the holders
of the Preferred Stock (other than a regular periodic cash dividend out of
earnings or retained earnings of the Company), (b) to offer to the holders of
the Preferred Stock rights or warrants to subscribe for or to purchase any
additional shares of Preferred Stock or shares of stock of any other class or
any other securities, rights or options, (c) to effect any reclassification of
the Preferred Stock (other than a reclassification involving only the
subdivision of outstanding shares of Preferred Stock), (d) 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 sales 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, (e) to effect the liquidation, dissolution or winding up of the Company,
or (f) to declare or pay any dividend on the Common Stock payable in Common
Stock or to effect a subdivision, combination or consolidation of the Common
Stock (by reclassification or otherwise than by payment of dividends in Common
Stock), then, in each such case, the Company shall give to each holder of a
Right, 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,
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 Stock and/or Preferred Stock, if any such date is to be fixed. Such
notice


                                       29
<PAGE>   34
shall be so given in the case of any action covered by clauses (a) or (b) above
at least ten days prior to the record date for determining holders of the
Preferred Stock for purposes of such action, and in the case of any such other
action, at least ten days prior to the date of the taking of such proposed
action or the date of participation therein by the holders of Preferred Stock,
whichever shall be the earlier. The failure to give notice required by this
Section 25 or any defect therein shall not affect the legality or validity of
the action taken by the Company or the vote upon any such action.

                  (b) In case a Section 11(b) Event 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 shall specify the event and the consequences of the event to
holders of Rights under Section 11(b) hereof.

                  Section 26. Notices. Notices or demands authorized by this
Rights 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:

                  Mobile Mini, Inc.
                  1834 West Third Street
                  Tempe, Arizona 85281
                  Attention:  Chief Executive Officer

Subject to the provisions of Section 21 hereof, any notice or demand authorized
by this Rights 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:

                  Norwest Bank Minnesota, N.A.
                          161 North Concord Exchange
                          P.O. Box 738
                          South St. Paul, MN  55075-0738
                          Attention: Shareowner Services

Notices or demands authorized by this Rights 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 Rights Agreement without the approval of
any holders of Right Certificates in order (a) to cure any ambiguity, (b) to
correct or supplement any provision contained herein which may be defective or
inconsistent with any other provisions herein, (c) to shorten or lengthen any
time period hereunder (including without limitation to extend the Final
Expiration Date), (d) increase or decrease the Purchase Price, or (e) to change
or supplement the provisions hereunder in any manner which the Company may deem
necessary or desirable; provided, however, that from and after such time as any
Person becomes an Acquiring Person, this Rights Agreement shall not be amended
in any manner which would adversely affect the


                                       30
<PAGE>   35
interests of the holders of Rights; provided further that this Rights Agreement
may not be supplemented or amended to lengthen pursuant to clause (c) of this
sentence, (A) the time period relating to the when the Rights may be redeemed at
such time as the Rights are not then redeemable, or (B) any other time period
unless such lengthening is for the purpose of protecting, enhancing or
clarifying the rights of, and/or the benefits to, the holders of the Rights;
provided further that the Company shall have the right to make unilaterally any
changes necessary to facilitate the appointment of a successor Rights Agent,
which such changes shall be set forth in a writing by the Company or by the
Company and such successor Rights Agent. Without limiting the foregoing, the
Company may at any time prior to such time as any Person becomes an Acquiring
Person amend this Rights Agreement to lower the thresholds set forth in Sections
1(a) and 3(a) hereof from 15% to not less than the greater of (i) any percentage
greater than the largest percentage of the Voting Power of the Company then
known by the Company to be beneficially owned by any Person (other than the
Company, any Subsidiary of the Company, or any employee benefit plan or
compensation arrangement of the Company or any Subsidiary of the Company, and
any entity holding securities of the Company to the extent organized, appointed
or established by the Company or any such Subsidiary for or pursuant to the
terms of any such employee benefit plan or compensation arrangement or any
Excepted Person) together with all Affiliates and Associates of such Person and
(ii) 10%. Upon the delivery of a certificate from an appropriate officer of the
Company which states that the proposed supplement or amendment is in compliance
with the terms of this Section 27, the Rights Agent shall execute such
supplement or amendment.

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

                  Section 29. Benefits of This Rights Agreement. Nothing in this
Rights Agreement shall be construed to give to any Person other than the
Company, the Rights Agent and the registered holders of the Right Certificates
(and, prior to the Distribution Date, the Common Stock) any legal or equitable
right, remedy or claim under this Rights Agreement; but this Rights Agreement
shall be for the sole and exclusive benefit of the Company, the Rights Agent and
the registered holders of the Right Certificates (and, prior to the Distribution
Date, the Common Stock).

                  Section 30. Severability. If any term, provision, covenant or
restriction of this Rights Agreement is held by a court of competent
jurisdiction or other authority to be invalid, void or unenforceable, the
remainder of the terms, provisions, covenants and restrictions of this Rights
Agreement shall remain in full force and effect and shall in no way be affected,
impaired or invalidated. It is the intent of the parties hereto to enforce the
remainder of the terms, provisions, covenants and restrictions of this Rights
Agreement to the maximum extent permitted by law.

                  Section 31. Governing Law. This Rights Agreement and each
Right Certificate issued hereunder shall be deemed to be a contract made under
the laws of the State of Delaware 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.



                                       31
<PAGE>   36
                  Section 32. Counterparts. This Rights Agreement may be
executed in any number of counterparts and each of such counterparts shall for
all purposes be deemed to be an original, and all such counterparts shall
together constitute but one and the same instrument.

                  Section 33. Descriptive Headings. Descriptive headings of the
several Sections of this Rights Agreement are inserted for convenience only and
shall not control or affect the meaning or construction of any of the provisions
hereof.











                           [Intentionally left blank.]





                                       32
<PAGE>   37
         IN WITNESS WHEREOF, the parties hereto have caused this Rights
Agreement to be duly executed, all as of the day and year first above written.



Attest:                                   MOBILE MINI, INC.


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



Attest:                                   NORWEST BANK MINNESOTA, N.A.


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





                                       33
<PAGE>   38
                                                                       EXHIBIT A

                                     FORM OF
         CERTIFICATE OF DESIGNATION, PREFERENCES AND RIGHTS OF SERIES C
                      JUNIOR PARTICIPATING PREFERRED STOCK

                                       OF

                                MOBILE MINI, INC.

            PURSUANT TO SECTION 151(g) OF THE GENERAL CORPORATION LAW
                            OF THE STATE OF DELAWARE

         We, _________, [NAME OF OFFICE], and __________, [NAME OF OFFICE], of
Mobile Mini, Inc., a corporation organized and existing under the General
Corporation Law of the state of Delaware (the "DGCL"), in accordance with the
provisions of Section 151(g) thereof, DO HEREBY CERTIFY:

         That pursuant to the authority conferred upon the Board of Directors by
the Amended and Restated Certificate of Incorporation, of the Company, the said
Board of Directors on December 9, 1999, adopted the following resolution
creating a series of One Hundred Seventy Thousand (170,000) shares of Preferred
Stock designated as Series C Junior Participating Preferred Stock:

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

                  Section 1. Designation and Amount.

                  There shall be a series of the Preferred Stock which shall be
designated as the "Series C Junior Participating Preferred Stock," par value
$0.01 per share, and the number of shares constituting such series shall be
170,000. Such number of shares may be increased or decreased by resolution of
the Board of Directors; provided, that no decrease shall reduce the number of
shares of Series C Junior Participating Preferred Stock to a number less than
that of the shares then outstanding plus the number of shares issuable upon
exercise of outstanding rights, options or warrants or upon conversion of
outstanding securities issued by the Company.

                  Section 2. Dividends and Distributions.

                  (A) Subject to the rights of the holders of any shares of any
series of preferred stock of the Company ranking prior and superior to the
Series C Junior Participating Preferred Stock with respect to dividends, the
holders of shares of Series C Junior Participating Preferred Stock, in
preference to the holders of shares of Common Stock, par value $0.01 per share
of the Company (the "Common Stock"), 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,
<PAGE>   39
quarterly dividends payable in cash on any regular quarterly dividend payment
date as shall be established by the Board of Directors (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 C Junior Participating Preferred Stock, in an
amount per share (rounded to the nearest cent) equal to the greater of (a) $1.00
or (b) subject to the provision for adjustment hereinafter set forth, 100 times
the aggregate per share amount of all cash dividends, and 100 times the
aggregate per share amount (payable in kind) of all non-cash dividends or other
distributions, other than a dividend payable in shares of Common Stock or a
subdivision of the outstanding shares of Common Stock (by reclassification or
otherwise), declared on the Common Stock since the immediately preceding
Quarterly Dividend Payment Date or, with respect to the first Quarterly Dividend
Payment Date, since the first issuance of any share or fraction of a share of
Series C Junior Participating Preferred Stock. In the event the Company shall at
any time after December 30, 1999 (the "Rights Declaration Date") 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 C Junior
Participating Preferred Stock were entitled immediately prior to such event
under clause (b) of the preceding sentence shall be adjusted by multiplying such
amount by a fraction, the numerator of which is the number of shares of Common
Stock outstanding immediately after such event and the denominator of which is
the number of shares of Common Stock that were outstanding immediately prior to
such event.

                  (B) The Company shall declare a dividend or distribution on
the Series C Preferred Stock as provided in paragraph (A) of this Section
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock); provided that, in the
event no dividend or distribution shall have been declared on the Common Stock
during the period between any Quarterly Dividend Payment Date and the next
subsequent Quarterly Dividend Payment Date, a dividend of $1.00 per share on the
Series C Junior Participating 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 C Junior Participating 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 C Junior Participating
Preferred Stock entitled to receive a quarterly dividend and before such
Quarterly Dividend Payment Date, in either of which events such dividends shall
begin to accrue and be cumulative from such Quarterly Dividend Payment Date.
Accrued but unpaid dividends shall not bear interest. Dividends paid on the
shares of Series C Junior Participating Preferred Stock in an amount less than
the total amount of such dividends at the time accrued and payable on such
shares shall be allocated pro rata on a share-by-share basis among all such
shares at the time outstanding. The Board of Directors may, in accordance with
applicable law, fix a record date for the determination of holders of shares of
Series C Junior Participating Preferred Stock entitled to receive payment of a
dividend or distribution declared


                                       2
<PAGE>   40
thereon, which record date shall be not more than such number of days prior to
the date fixed for the payment thereof as may be allowed by applicable law.

                  Section 3. Voting Rights.

                  The holders of shares of Series C Junior Participating
Preferred Stock shall have the following voting rights:

                  (A) Each share of Series C Junior Participating Preferred
Stock shall entitle the holder thereof to 100 votes on all matters submitted to
a vote of the stockholders of the Company. In the event the Company shall at any
time after the Rights Declaration Date 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 to which holders of shares of Series C Junior Participating
Preferred Stock were entitled immediately prior to such event under 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) Except as otherwise provided herein, in the Company's
Amended and Restated Certificate of Incorporation or by law, the holders of
shares of Series C Junior Participating Preferred Stock, the holders of shares
of Common Stock, and the holders of shares of any other capital stock of the
Company having general voting rights, shall vote together as one class on all
matters submitted to a vote of stockholders of the Company.

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

                  Section 4. Certain Restrictions.

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

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

                           (ii) declare or pay dividends on or make any other
         distributions on any shares of stock ranking on a parity (either as to
         dividends or upon liquidation, dissolution


                                       3
<PAGE>   41
         or winding up) with the Series C Junior Participating Preferred Stock,
         except dividends paid ratably on the Series C Junior Participating
         Preferred Stock and all such parity stock on which dividends are
         payable or in arrears in proportion to the total amounts to which the
         holders of all such shares are then entitled;

                           (iii) except as permitted in Section 4(A)(iv) below,
         redeem or purchase or otherwise acquire for consideration shares of any
         stock ranking on a parity (either as to dividends or upon liquidation,
         dissolution or winding up) with the Series C Junior Participating
         Preferred Stock, provided that the Company may at any time redeem,
         purchase or otherwise acquire shares of any such parity stock in
         exchange for shares of any stock of the Company ranking junior (either
         as to dividends or upon dissolution, liquidation or winding up) to the
         Series C Junior Participating Preferred Stock; and

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

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

                  Section 5. Reacquired Shares.

                  Any shares of Series C Junior Participating Preferred Stock
purchased or otherwise acquired by the Company in any manner whatsoever shall be
retired and canceled promptly after the acquisition thereof. The Company shall
cause all such shares upon their cancellation to be authorized but unissued
shares of Preferred Stock which may be reissued as part of a new series of
Preferred Stock, subject to the conditions and restrictions on issuance set
forth herein.

                  Section 6. Liquidation, Dissolution or Winding Up.

                  (A) Subject to the rights of the holders of any shares of any
series of Preferred Stock of the Company ranking prior and superior to the
Series C Junior Participating Preferred Stock with respect to liquidation, upon
any liquidation (voluntary or otherwise), dissolution or winding up of the
Company, no distribution shall be made to the holders of shares of stock ranking
junior (either as to dividends or upon liquidation, dissolution or winding up)
to the Series C Junior Participating Preferred Stock unless, prior thereto, the
holders of shares of Series C Junior Participating Preferred Stock shall have
received $100.00 per share, plus an amount equal to accrued and unpaid dividends
and distributions thereon, whether or not declared, to the date of such payment
(the "Series C Liquidation Preference"). Following the payment of the full
amount of the Series C Liquidation Preference, no additional distributions shall
be made to the


                                       4
<PAGE>   42
holders of shares of Series C Junior Participating Preferred Stock, unless,
prior thereto, the holders of shares of Common Stock shall have received an
amount per share (the "Common Adjustment") equal to the quotient obtained by
dividing (i) the Series C Liquidation Preference by (ii) 100 (as appropriately
adjusted as set forth in subparagraph C below to reflect such events as stock
dividends, and subdivisions, combinations and consolidations with respect to the
Common Stock) (such number in clause (ii) being referred to as the "Adjustment
Number"). Following the payment of the full amount of the Series C Liquidation
Preference and the Common Adjustment in respect of all outstanding shares of
Series C Junior Participating Preferred Stock and Common Stock, respectively,
holders of Series C Junior Participating Preferred Stock and holders of shares
of Common Stock shall receive their ratable and proportionate share of the
remaining assets to be distributed in the ratio of the Adjustment Number to 1
with respect to such Series C Junior Participating Preferred Stock and Common
Stock, on a per share basis, respectively.

                  (B) In the event there are not sufficient assets available to
permit payment in full of the Series C Liquidation Preference and the
liquidation preferences of all other series of preferred stock, if any, which
rank on a parity with the Series C Junior Participating Preferred Stock, then
such remaining assets shall be distributed ratably to the holders of such parity
shares in proportion to their respective liquidation preferences. In the event
there are not sufficient assets available to permit payment in full of the
Common Adjustment, then such remaining assets shall be distributed ratably to
the holders of Common Stock.

                  (C) In the event the Company shall at any time after the
Rights Declaration Date declare or pay any dividend on 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 Adjustment Number
in effect immediately prior to such event shall be adjusted by multiplying such
Adjustment Number by a fraction the numerator of which is the number of 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 Company shall enter into any consolidation,
merger, combination or other transaction in which the shares of Common Stock are
exchanged for or changed into other stock or securities, cash and/or any other
property, then in any such case the shares of Series C Junior Participating
Preferred Stock shall at the same time be similarly exchanged or changed in an
amount per share (subject to the provision for adjustment hereinafter set forth)
equal to 100 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 Company
shall at any time after the Rights Declaration Date declare or pay any dividend
on 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 C Junior Participating Preferred Stock
shall be adjusted by multiplying such amount by a fraction the


                                       5
<PAGE>   43
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 are outstanding immediately prior to such event.

                  Section 8. Redemption.

                  The shares of Series C Junior Participating Preferred Stock
shall not be redeemable.

                  Section 9. Ranking.

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

                  Section 10. Fractional Shares.

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

         IN WITNESS WHEREOF, we have executed and subscribed this Certificate
and do affirm the foregoing as true under the penalties of perjury this ____ day
of December, 1999.



                                      By:
                                         -----------------------------------
                                      Name:  [NAME OF OFFICER]

                                      Title:  [OFFICE]

Attest

By:
   -------------------------

Name:  [NAME OF OFFICER]

Title:  [OFFICE]








                                       6
<PAGE>   44
                                                                       EXHIBIT B

                           [FORM OF RIGHT CERTIFICATE]

              Certificate No. R-___________             ____ Rights

              NOT  EXERCISABLE  AFTER THE  EXPIRATION  DATE. AT THE
              OPTION OF THE  COMPANY,  THE  RIGHTS  ARE  SUBJECT TO
              REDEMPTION  AT $0.01 PER RIGHT OR EXCHANGE FOR COMMON
              STOCK,  UNDER THE  CIRCUMSTANCES AND ON THE TERMS SET
              FORTH  IN  THE  RIGHTS   AGREEMENT.   UNDER   CERTAIN
              CIRCUMSTANCES,   RIGHTS   BENEFICIALLY  OWNED  BY  AN
              ACQUIRING  PERSON OR AN  ASSOCIATE OR AFFILIATE OF AN
              ACQUIRING  PERSON AND ANY  SUBSEQUENT  HOLDER OF SUCH
              RIGHTS  MAY  BECOME   NULL  AND  VOID.   [THE  RIGHTS
              REPRESENTED BY THIS RIGHT  CERTIFICATE WERE ISSUED TO
              A PERSON WHO WAS AN ACQUIRING  PERSON OR AN AFFILIATE
              OR AN ASSOCIATE OF AN  ACQUIRING  PERSON.  THIS RIGHT
              CERTIFICATE  AND THE  RIGHTS  REPRESENTED  HEREBY ARE
              VOID IN THE  CIRCUMSTANCES  SPECIFIED IN SECTION 7(e)
              OF THE RIGHTS AGREEMENT.]*

                               Right Certificate

                                MOBILE MINI, INC.

         This certifies that________ , or registered assigns, is the registered
owner of the number of Rights set forth above, each of which entitles the owner
thereof, subject to the terms, provisions and conditions of the Rights Agreement
dated as of December 9, 1999 (the "Rights Agreement") between Mobile Mini,
Inc., a Delaware corporation (the "Company"), and Norwest Bank Minnesota, N.A.,
a national banking association (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. Tempe, Arizona time on the Expiration
Date, as that term is defined in the Rights Agreement, at the stockholder
services office (or such office designated for such purpose) of the Rights
Agent, or its successor as Rights Agent, one one-hundredth of a fully paid,
nonassessable share of the Series C Junior Participating Preferred Stock, par
value $0.01 per share ("Preferred Stock"), of the Company, at a purchase price
of $80.00 per one one-hundredth of a 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 shares which may be purchased upon exercise of
each Right) and the Purchase Price set forth above, are the number and Purchase
Price as of _________, _____based on the shares of Preferred Stock of the
Company as constituted at such date.

         The Purchase Price and the number of shares of Preferred Stock which
may be purchased upon the exercise of each of the Rights evidenced by this Right
Certificate are subject to
- ------------------
*    The portion of the legend in brackets shall be inserted only if applicable.
<PAGE>   45
modification  and adjustment upon the happening of certain events as provided in
the Rights Agreement.

         This Right Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference is hereby made for a full description of the rights,
limitations of rights, obligations, duties and immunities hereunder of the
Rights Agent, the Company and the holders of the Right Certificates. Copies of
the Rights Agreement are on file at the Company and the above-mentioned office
of the Rights Agent and are also available upon written request to the Company.

         This Right Certificate, with or without other Right Certificates, upon
surrender at the stockholder services office (or such office designated for such
purpose) 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 shares of Preferred Stock 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 may be redeemed by the Company at its option at a redemption
price of $0.01 per Right on or prior to the Stock Acquisition Date (as defined
in the Rights Agreement). In addition, subject to the provisions of the Rights
Agreement, each Right evidenced by this Certificate may be exchanged by the
Company at its option for one share of Common Stock following the Stock
Acquisition Date and prior to the time an Acquiring Person, as that term is
defined in the Rights Agreement, owns 50% or more of the Voting Power, as that
term is defined in the Rights Agreement, of the Company.

         No fractional shares of Preferred Stock will be issued upon the
exercise of any Rights evidenced hereby (other than fractions which are integral
multiples of one one-hundredth of a share of Preferred Stock, which may, at the
election of the Company, be evidenced by depositary receipts). In lieu of
fractions of a share, 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 shares of Preferred
Stock or of any other securities of the Company which may at any time be
issuable on the exercise hereof, nor shall anything contained in the Rights
Agreement or herein be construed to confer upon the holder hereof, as such, any
of the rights of a stockholder of the Company or any right to vote for the
election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting stockholders (except as
provided in the Rights Agreement), or to receive dividends or subscription
rights, or otherwise, until the 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.


                                       2
<PAGE>   46
         WITNESS the facsimile signature of the proper officers of the Company
and its corporate seal. Dated as of __________, _____.



Attest:                                   MOBILE MINI, INC.


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



Countersigned:

NORWEST BANK MINNESOTA, N.A.

By:
   --------------------------
Authorized signature






                                       3
<PAGE>   47
                   [FORM OF REVERSE SIDE OF RIGHT CERTIFICATE]

                               FORM OF ASSIGNMENT

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


         FOR VALUE RECEIVED _________________________________________ hereby
sells, assigns and transfers unto_______________________________________________
(please print name and address of transferee) __________________________________
this Right Certificate, together with all right, title and interest therein, and
does hereby irrevocably constitute and appoint _____________ Attorney to
transfer the within Right Certificate on the books of the within-named Company,
with full power of substitution.

Dated:__________________


                                    _____________________________________
                                    Signature

                                    (Signature must conform in all respects to
                                    name of holder as specified on the face of
                                    this Right Certificate)

Signature Guaranteed:

                  Signatures must be guaranteed by a member or a participant in
the Securities Transfer Agent Medallion Program, the New York Stock Exchange
Medallion Signature Program or the Stock Exchange Medallion Program.



<PAGE>   48
                                   CERTIFICATE

         The undersigned hereby certifies by checking the appropriate boxes
that:

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

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

Dated:_________________
                                    ___________________________________
                                    Signature

                                    (Signature must conform in all respects to
                                    name of holder as specified on the face of
                                    this Right Certificate)




<PAGE>   49
                          FORM OF ELECTION TO PURCHASE


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

To Mobile Mini, Inc.:

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

                  Name:
                       -------------------------------
                  Address:
                          ----------------------------
                         -----------------------------
                  Social security
                  or taxpayer identification
                  number:
                         -----------------------------

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:

                  Name:
                       -------------------------------
                  Address:
                          ----------------------------
                         -----------------------------
                  Social security
                  or taxpayer identification
                  number:
                         -----------------------------


Dated:
      ------------------

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

                                    (Signature must conform in all respects to
                                    name of holder as specified on the face of
                                    this Right Certificate)

Signature Guaranteed:

         Signatures must be guaranteed by a member or a participant in the
Securities Transfer Agent Medallion Program, the New York Stock Exchange
Medallion Signature Program or the Stock Exchange Medallion Program.




                                       1
<PAGE>   50
                                   CERTIFICATE


         The undersigned hereby certifies by checking the appropriate boxes
that:

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

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

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

Dated:_______________

                                    __________________________________________
                                    Signature

                                    (Signature must conform in all respects to
                                    name of holder as specified on the face of
                                    this Right Certificate)


                                     NOTICE


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

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





                                       2
<PAGE>   51
                                                                       EXHIBIT C


                                MOBILE MINI, INC.

                           SUMMARY OF PREFERRED STOCK
                                 PURCHASE RIGHTS

         On December 9, 1999, the Board of Directors of Mobile Mini, Inc. (the
"Company") declared a dividend of one preferred share purchase right (a "Right")
for each outstanding share of common stock, par value $0.01 per share, of the
Company (the "Common Stock"). The dividend distribution is payable on December
30, 1999 (the "Record Date") to the stockholders of record on that date. Each
Right entitles the registered holder to purchase from the Company one
one-hundredth of a share of Series C Junior Participating Preferred Stock, par
value $0.01 per share (the "Preferred Stock") of the Company at a price of
$80 per one one-hundredth of a share of Preferred Stock (the "Purchase
Price"), subject to adjustment. The description and terms of the Rights are set
forth in a Rights Agreement dated as of December 9, 1999, as the same may be
amended from time to time (the "Rights Agreement"), between the Company and
Norwest Bank Minnesota, N.A., as Rights Agent (the "Rights Agent").

         Until the earlier to occur of (i) the close of business on the tenth
business day following the date of public announcement or the date on which the
Company first has notice or determines that a person or group of affiliated or
associated persons (other than the Company, any subsidiary of the Company or any
employee benefit plan of the Company or Richard E. Bunger, his family and
certain related entities) (an "Acquiring Person") has acquired, or obtained the
right to acquire, 15% or more of the outstanding shares of voting stock of the
Company without the prior express written consent of the Company executed on
behalf of the Company by a duly authorized officer of the Company following
express approval by action of at least a majority of the members of the Board of
Directors then in office (the "Stock Acquisition Date") or (ii) the close of
business on the tenth business day (or such later date as may be determined by
action of the Board of Directors but not later than the Stock Acquisition Date)
following the commencement of a tender offer or exchange offer, without the
prior written consent of the Company, by a person (other than the Company, any
subsidiary of the Company or an employee benefit plan of the Company or Richard
E. Bunger, his family and certain related entities) which, upon consummation,
would result in such party's control of 15% or more of the Company's voting
stock (the earlier of the dates in clause (i) or (ii) above being called the
"Distribution Date"), the Rights will be evidenced, with respect to any of the
Common Stock certificates outstanding as of the Record Date, by such Common
Stock certificates.

         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 Company's Common Stock. Until the Distribution Date (or
earlier redemption, exchange or expiration of the Rights), new Common Stock
certificates issued after the Record Date upon transfer or new issuances of
Common Stock will contain a notation incorporating the Rights Agreement by
reference. Until the Distribution Date (or earlier redemption, exchange or
expiration of the Rights), the surrender for transfer of any certificates for
shares of Common Stock outstanding as of the Record Date, even without such
notation or a copy of this Summary of Rights, will also


                                       1
<PAGE>   52
constitute the transfer of the Rights associated with the Common Stock
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 Stock as of the
close of business on the Distribution Date and such separate certificates alone
will then evidence the Rights.

         The Rights are not exercisable until the Distribution Date. The Rights
will expire, if not previously exercised, on December __, 2009 (the "Final
Expiration Date"), unless the Final Expiration Date is extended or unless the
Rights are earlier redeemed or exchanged by the Company.

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

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

         Shares of Preferred Stock purchasable upon exercise of the Rights will
not be redeemable and junior to any other series of preferred stock the Company
may issue (unless otherwise provided in the terms of such stock). Each share of
Preferred Stock will have a preferential dividend in an amount equal to 100
times any dividend declared on each share of Common Stock. In the event of
liquidation, the holders of the Preferred Stock will receive a preferred
liquidation payment of equal to the greater of $100 and 100 times the payment
made per share of Common Stock. Each share of Preferred Stock will have 100
votes, voting together with the Common Stock. In the event of any merger,
consolidation or other transaction in which shares of Common Stock are converted
or exchanged, each share of Preferred Stock will be entitled to receive 100
times the amount and type of consideration received per share of Common Stock.
The rights of the Preferred Stock as to dividends, liquidation and voting, and
in the event of mergers and consolidations, are protected by customary
antidilution provisions.

         Because of the nature of the Preferred Stock's dividend, liquidation
and voting rights, the value of the one one-hundredth interest in a share of
Preferred Stock purchasable upon exercise of each Right should approximate the
value of one share of Common Stock.

         If any person or group (other than the Company, any subsidiary of the
Company, any employee benefit plan of the Company or Richard E. Bunger, his
family and certain related


                                       2

<PAGE>   53
entities) acquires 15% or more of the Company's outstanding voting stock without
the prior written consent of the Board of Directors, each Right, except those
held by such persons, would entitle each holder of a Right to acquire such
number of shares of the Company's Common Stock as shall equal the result
obtained by multiplying the then current Purchase Price by the number of one
one-hundredths of a share of Preferred Stock for which a Right is then
exercisable and dividing that product by 50% of the then current per-share
market price of Company Common Stock.

         If any person or group (other than the Company, any subsidiary of the
Company, any employee benefit plan of the Company or Richard E. Bunger, his
family and certain related entities) acquires more than 15% but less than 50% of
the outstanding Company Common Stock without prior written consent of the Board
of Directors, each Right, except those held by such persons, may be exchanged by
the Board of Directors for one share of Company Common Stock.

         If the Company were acquired in a merger or other business combination
transaction where the Company is not the surviving corporation or where Company
Common Stock is exchanged or changed or 50% or more of the Company's assets or
earnings power is sold in one or several transactions without the prior written
consent of the Board of Directors, each Right would entitle the holders thereof
(except for the Acquiring Person) to receive such number of shares of the
acquiring company's common stock as shall be equal to the result obtained by
multiplying the then current Purchase Price by the number one one-hundredths of
a share of Preferred Stock for which a Right is then exercisable and dividing
that product by 50% of the then current market price per share of the common
stock of the acquiring company on the date of such merger or other business
combination transaction.

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

         At any time prior to the time an Acquiring Person becomes such, the
Board of Directors of the Company may redeem the Rights in whole, but not in
part, at a price of $0.01 per Right (the "Redemption Price"). The redemption of
the Rights may be made effective at such time, on such basis and with such
conditions as the Board of Directors in its sole discretion may establish.
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.

         The terms of the Rights may be amended by the Board of Directors of the
Company without the consent of the holders of the Rights, including, but not
limited to, an amendment to lower certain thresholds described above to not less
than the greater of (i) any percentage greater than the largest percentage of
the voting power of all securities of the Company then known to the Company to
be beneficially owned by any person or group of affiliated or associated persons
(other than an excepted person) and (ii) 10%, except that from and after such
time as any person


                                       3
<PAGE>   54
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.

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

         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
December 13, 1999. 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,
as the same may be amended from time to time, which is hereby incorporated
herein by reference.









                                       4

<PAGE>   1
                                                                       EXHIBIT 2

                         [MOBILE MINI, INC. LETTERHEAD]

                               December ___, 1999



To Our Stockholders:


                  On December 9, 1999, your Board of Directors adopted a
Shareholder Rights Plan designed to provide our stockholders with assurance that
they will benefit from the long-term prospects and increases in value of the
Company. The Board of Directors declared a dividend distribution of one
Preferred Stock Purchase Right for each outstanding share of the Company's
Common Stock to holders of record as of the close of business on December 30,
1999.


                  Each Right will entitle you, under certain conditions, to
purchase one one-hundredth of a share of Series C Junior Participating Preferred
Stock. Although you are the owner of the Right as of December 30, 1999, under
the terms of the Rights Plan no certificate evidencing the Right will be issued
to you at this time. At the present time, the summary description referred to in
the immediately succeeding paragraph of this letter, and a legend appearing on
the backs of Common Stock certificates issued after December 30, 1999, are the
only evidence you will receive or require with respect to your ownership of the
Rights.


                  This letter describes the Board's reasons for issuing the
Rights. In addition, we are enclosing a Summary description that outlines the
principal features of the new Rights Plan, and we urge you to read it carefully.


                  Many publicly-held companies currently have similar plans. The
Board considers the Rights Plan to be an appropriate means to protect your
equity investment in the Company and the full value of that investment.


                  The Plan is designed to protect stockholders against abusive
takeover tactics. We believe that such tactics can unfairly deprive stockholders
of their opportunity to profit from the long term potential of the Company, and
can pressure stockholders to act hastily by threatening to squeeze them out of
their investments at less than fair value.


                  The Board was aware when it approved the Rights Plan that some
people have advanced arguments that such plans deter legitimate acquisition
proposals. The Board carefully considered those views and concluded that such
arguments are speculative and unconvincing and certainly do not justify leaving
stockholders with less effective protection against unfair treatment by an
acquirer who, after all, would be seeking to further its own interests, and not
yours.


                  It must be emphasized that the Shareholder Rights Plan is not
intended to prevent a tender offer or other acquisition proposal for the Company
which is fair and equitable to all stockholders. The Rights should not affect
any prospective offeror who is willing to negotiate with your Board of Directors
and to make an offer for all of the Company's stock at a full and fair



<PAGE>   2
price. Furthermore, the Rights Plan will not in any way prevent an individual
stockholder from exercising his or her right to vote for a change in the
management or operation of the Company.


                  The distribution of the Rights is not taxable to you or to the
Company and does not in any way weaken the financial strength of the Company or
interfere with its business plans. If the Rights should become exercisable,
stockholders, depending upon the particular circumstances then applicable, may
realize taxable income at that time. The Rights are not dilutive and will not
affect reported earnings per share, nor will the Rights affect the manner in
which you may presently buy or sell the Company's shares.


                  A copy of the Rights Agreement has been filed with the
Securities and Exchange Commission and is available free of charge from either
the Company or the Rights Agent, Norwest Bank Minnesota, N.A.


                  In conclusion, your Board believes that the Shareholder Rights
Plan represents a sound and reasonable means of providing stockholders
protection against takeovers that do not provide fair value. Your Board and
management are enthusiastic about the potential for your Company and are
committed to serving the best interests of its stockholders. Accordingly, we
take great satisfaction in providing these new Rights to you in order to
preserve for you the long-term value of your investment in the Company.





                                   Sincerely,



                                   Richard E. Bunger
                                   Chairman of the Board of Directors,
                                   Mobile Mini, Inc.





                                       2
<PAGE>   3
                                MOBILE MINI, INC.

                           SUMMARY OF PREFERRED STOCK
                                 PURCHASE RIGHTS

         On December 9, 1999, the Board of Directors of Mobile Mini, Inc. (the
"Company") declared a dividend of one preferred share purchase right (a "Right")
for each outstanding share of common stock, par value $0.01 per share, of the
Company (the "Common Stock"). The dividend distribution is payable on December
30, 1999 (the "Record Date") to the stockholders of record on that date. Each
Right entitles the registered holder to purchase from the Company one
one-hundredth of a share of Series C Junior Participating Preferred Stock, par
value $0.01 per share (the "Preferred Stock") of the Company at a price of
$80.00 per one one-hundredth of a share of Preferred Stock (the "Purchase
Price"), subject to adjustment. The description and terms of the Rights are set
forth in a Rights Agreement dated as of December 9, 1999, as the same may be
amended from time to time (the "Rights Agreement"), between the Company and
Norwest Bank Minnesota, N.A., as Rights Agent (the "Rights Agent").

         Until the earlier to occur of (i) the close of business on the tenth
business day following the date of public announcement or the date on which the
Company first has notice or determines that a person or group of affiliated or
associated persons (other than the Company, any subsidiary of the Company or any
employee benefit plan of the Company or Richard E. Bunger, his family and
certain related entities) (an "Acquiring Person") has acquired, or obtained the
right to acquire, 15% or more of the outstanding shares of voting stock of the
Company without the prior express written consent of the Company executed on
behalf of the Company by a duly authorized officer of the Company following
express approval by action of at least a majority of the members of the Board of
Directors then in office (the "Stock Acquisition Date") or (ii) the close of
business on the tenth business day (or such later date as may be determined by
action of the Board of Directors but not later than the Stock Acquisition Date)
following the commencement of a tender offer or exchange offer, without the
prior written consent of the Company, by a person (other than the Company, any
subsidiary of the Company or an employee benefit plan of the Company or Richard
E. Bunger, his family and certain related entities) which, upon consummation,
would result in such party's control of 15% or more of the Company's voting
stock (the earlier of the dates in clause (i) or (ii) above being called the
"Distribution Date"), the Rights will be evidenced, with respect to any of the
Common Stock certificates outstanding as of the Record Date, by such Common
Stock certificates.

         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 Company's Common Stock. Until the Distribution Date (or
earlier redemption, exchange or expiration of the Rights), new Common Stock
certificates issued after the Record Date upon transfer or new issuances of
Common Stock will contain a notation incorporating the Rights Agreement by
reference. Until the Distribution Date (or earlier redemption, exchange or
expiration of the Rights), the surrender for transfer of any certificates for
shares of Common Stock outstanding as of the Record Date, even without such
notation or a copy of this Summary of Rights, will also constitute the transfer
of the Rights associated with the Common Stock represented by such certificate.
As soon as practicable following the Distribution Date, separate certificates




<PAGE>   4
evidencing the Rights ("Right Certificates") will be mailed to holders of record
of the Common Stock as of the close of business on the Distribution Date and
such separate certificates alone will then evidence the Rights.

         The Rights are not exercisable until the Distribution Date. The Rights
will expire, if not previously exercised, on December __, 2009 (the "Final
Expiration Date"), unless the Final Expiration Date is extended or unless the
Rights are earlier redeemed or exchanged by the Company.

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

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

         Shares of Preferred Stock purchasable upon exercise of the Rights will
not be redeemable and junior to any other series of preferred stock the Company
may issue (unless otherwise provided in the terms of such stock). Each share of
Preferred Stock will have a preferential dividend in an amount equal to 100
times any dividend declared on each share of Common Stock. In the event of
liquidation, the holders of the Preferred Stock will receive a preferred
liquidation payment of equal to the greater of $100 and 100 times the payment
made per share of Common Stock. Each share of Preferred Stock will have 100
votes, voting together with the Common Stock. In the event of any merger,
consolidation or other transaction in which shares of Common Stock are converted
or exchanged, each share of Preferred Stock will be entitled to receive 100
times the amount and type of consideration received per share of Common Stock.
The rights of the Preferred Stock as to dividends, liquidation and voting, and
in the event of mergers and consolidations, are protected by customary
antidilution provisions.

         Because of the nature of the Preferred Stock's dividend, liquidation
and voting rights, the value of the one one-hundredth interest in a share of
Preferred Stock purchasable upon exercise of each Right should approximate the
value of one share of Common Stock.

         If any person or group (other than the Company, any subsidiary of the
Company, any employee benefit plan of the Company or Richard E. Bunger, his
family and certain related entities) acquires 15% or more of the Company's
outstanding voting stock without the prior written consent of the Board of
Directors, each Right, except those held by such persons, would


                                       2
<PAGE>   5
entitle each holder of a Right to acquire such number of shares of the Company's
Common Stock as shall equal the result obtained by multiplying the then current
Purchase Price by the number of one one-hundredths of a share of Preferred Stock
for which a Right is then exercisable and dividing that product by 50% of the
then current per-share market price of Company Common Stock.

         If any person or group (other than the Company, any subsidiary of the
Company, any employee benefit plan of the Company or Richard E. Bunger, his
family and certain related entities) acquires more than 15% but less than 50% of
the outstanding Company Common Stock without prior written consent of the Board
of Directors, each Right, except those held by such persons, may be exchanged by
the Board of Directors for one share of Company Common Stock.

         If the Company were acquired in a merger or other business combination
transaction where the Company is not the surviving corporation or where Company
Common Stock is exchanged or changed or 50% or more of the Company's assets or
earnings power is sold in one or several transactions without the prior written
consent of the Board of Directors, each Right would entitle the holders thereof
(except for the Acquiring Person) to receive such number of shares of the
acquiring company's common stock as shall be equal to the result obtained by
multiplying the then current Purchase Price by the number one one-hundredths of
a share of Preferred Stock for which a Right is then exercisable and dividing
that product by 50% of the then current market price per share of the common
stock of the acquiring company on the date of such merger or other business
combination transaction.

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

         At any time prior to the time an Acquiring Person becomes such, the
Board of Directors of the Company may redeem the Rights in whole, but not in
part, at a price of $0.01 per Right (the "Redemption Price"). The redemption of
the Rights may be made effective at such time, on such basis and with such
conditions as the Board of Directors in its sole discretion may establish.
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.

         The terms of the Rights may be amended by the Board of Directors of the
Company without the consent of the holders of the Rights, including, but not
limited to, an amendment to lower certain thresholds described above to not less
than the greater of (i) any percentage greater than the largest percentage of
the voting power of all securities of the Company then known to the Company to
be beneficially owned by any person or group of affiliated or associated persons
(other than an excepted person) and (ii) 10%, except that from and after such
time as any person


                                       3
<PAGE>   6
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.

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

         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
December __, 1999. 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,
as the same may be amended from time to time, which is hereby incorporated
herein by reference.









                                       4


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