LIGHTBRIDGE INC
8-A12G, 1997-11-21
RADIOTELEPHONE COMMUNICATIONS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C.  02549


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


                                   FORM 8-A

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


                               LIGHTBRIDGE,INC.
  ---------------------------------------------------------------------------
            (Exact name of registrant as specified in its charter)


              Delaware                                   04-3065140
(State of incorporation or organization)      (IRS Employer Identification No.)


67 South Bedford Street, Burlington, Massachusetts          01803        
    (Address of principal executive offices)             (Zip Code)


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

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

                               None.
                               
                     
       Securities to be registered pursuant to Section 12(g) of the Act:
                          Rights to Purchase Series A
                   Participating Cumulative Preferred Stock
                               (Title of Class)

<PAGE>
 
Item 1.  Description of Securities to be Registered.

     On November 14, 1997, the Board of Directors of Lightbridge, Inc. (the 
"Company") declared a dividend of one Right for each outstanding share of 
Common Stock, par value $.01 per share, of the Company (the "Common Shares").  
The Rights will be issued to the holders of record of Common Shares 
outstanding on November 14, 1997, and with respect to Common Shares issued 
thereafter until the Distribution Date (as defined below) and, in certain 
circumstances, with respect to Common Shares issued after the Distribution 
Date.  Each Right, when it becomes exercisable as described below, will 
entitle the registered holder to purchase from the Company one one-hundredth 
(1/100th) of a share of Series A Participating Cumulative Preferred Stock, par 
value $.01 per share, of the Company (the "Preferred Shares") at a price of 
$75.00 (the "Purchase Price").  The description and terms of the Rights are 
set forth in a Rights Agreement dated as of November 14, 1997 (the "Rights 
Agreement") between the Company and American Stock Transfer and Trust Company, 
as Rights Agent (the "Rights Agent").

     Until the earlier of (i) such time as the Company learns that a person or 
group (including any affiliate or associate of such person or group) acquired, 
or obtained the right to acquire, beneficial ownership of 15% or more of the 
outstanding Common Shares (such person or group being called an "Acquiring 
Person") or (ii) such date, if any, as may be designated by the Board of 
Directors of the Company following the commencement of, or first public 
disclosure of an intent to commence, a tender or exchange offer for 
outstanding Common Shares which could result in the offeror becoming the 
beneficial owner of 15% or more of the outstanding Common Shares (the earlier 
of such dates being called the "Distribution Date"), the Rights will be 
evidenced by the certificates for Common Shares registered in the names of the 
holders thereof (which certificates for Common Shares shall also be deemed to 
be Right Certificates, as defined below) and not by separate Right 
Certificates.  Therefore, until the Distribution Date, the Rights will be 
transferred with and only with the Common Shares.

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

                                      -2-
<PAGE>
 
issued after the Distribution Date), and such separate Right Certificates alone
will thereafter evidence the Rights.

     The Rights are not exercisable until the Distribution Date and will 
expire on November 14, 2007 (the "Expiration Date"), unless earlier redeemed 
by the Company as described below.

     To preserve the actual or potential economic value of the Rights, the 
number of Preferred Shares or other securities issuable upon exercise of a 
Right, the Purchase Price and Redemption Price and the number of Rights 
associated with each outstanding Common Share are all subject to adjustment by 
the Board of Directors as provided in the Rights Agreement in the event of any 
change in the Common Shares or Preferred Shares, whether by reason of stock 
dividends, stock splits, recapitalizations, mergers, consolidations, 
combinations or exchanges of securities, split-ups, split-offs, spin-offs, 
liquidations, other similar changes in capitalization, any distribution or 
issuance of cash, assets, evidences of indebtedness or subscription rights, 
options or warrants to holders of Common Shares or Preferred Shares, as the 
case may be (other than distribution of the Rights or regular quarterly cash 
dividends) or otherwise.
 
     The Preferred Shares are authorized to be issued in fractions which are 
an integral multiple of one one-hundredth (1/100th) of a Preferred Share.  The 
Company may, but is not required to, issue fractions of shares upon the 
exercise of Rights, and, in lieu of fractional shares, the Company may issue 
certificates or utilize a depository arrangement as provided by the terms of 
the Preferred Shares and, in the case of fractions other than one 
one-hundredth (1/100th) of a Preferred Share or integral multiples thereof, 
may make a cash payment based on the market price of such shares.

     Upon a person or a group becoming an Acquiring Person, the Rights will 
entitle each holder of a Right to purchase, for the Purchase Price, that 
number of one one-hundredths (1/100ths) of a Preferred Share equivalent to the 
number of Common Shares which at the time of the transaction would have a 
market value of twice the Purchase Price. 

     In the event the Company is acquired in a merger or other business 
combination or 50% or more of its assets or assets representing 50% or more of 
its earning power are sold, leased, 

                                      -3-
<PAGE>
 
exchanged or otherwise transferred (in one or more transactions) to a publicly
traded corporation, each Right will entitle its holder to purchase, for the
Purchase Price, that number of common shares of such corporation which at the
time of the transaction would have a market value of twice the Purchase Price.
In the event the Company is acquired in a merger or other business combination
or 50% or more of its assets or assets representing 50% or more of the earning
power of the Company are sold, leased, exchanged or otherwise transferred (in
one or more transactions) to an entity that is not a publicly traded
corporation, each Right will entitle its holder to purchase, for the Purchase
Price, at such holder's option, (i) that number of shares of such entity (or, at
such holder's option, of the surviving corporation in such acquisition, which
could be the Company) which at the time of the transaction would have a book
value of twice the Purchase Price or (ii) if such entity has an affiliate which
has publicly traded common shares, that number of common shares of such
affiliate which at the time of the transaction would have a market value of
twice the Purchase Price.

     Any Rights that are at any time beneficially owned by an Acquiring Person 
(or any affiliate or associate of an Acquiring Person) shall be null and void 
and nontransferable, and any holder of any such Right (including any purported 
transferee or subsequent holder) shall not have any right to exercise or 
transfer any such right.

     At any time after a person or a group becomes an Acquiring Person, the 
Board of Directors of the Company may exchange all or part of the then 
outstanding Rights (other than Rights that have become null and void and 
nontransferable as described above) for consideration per Right consisting of 
one-half of the securities that otherwise would have been issuable to the 
holder of each Right upon exercise thereof.  The Board of Directors of the 
Company may also issue, in substitution for Preferred Shares, Common Shares 
having an equivalent market value to the Preferred Shares if, at such time, 
the Company has a sufficient number of Common Shares issued but not 
outstanding or authorized but unissued.

     At any time prior to the earlier of (i) such time as a person becomes an 
Acquiring Person and (ii) the Expiration Date, the Board of Directors of the 
Company may redeem the Rights in whole, but not in part, at a price (in cash 
or Common Shares or other securities of the Company deemed by the Board of 
Directors 

                                      -4-
<PAGE>
 
to be at least equivalent in value) of $.01 per Right (the "Redemption Price").

     Immediately upon the action of the Board of Directors of the Company 
electing to redeem the Rights, the Company shall make an announcement thereof, 
and, upon such election, the right to exercise the Rights will terminate and 
the only right of the holders of Rights will be to receive the Redemption 
Price.

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

     At any time prior to the Distribution Date, the Company may, without the 
approval of any holder of the Rights, supplement or amend any provision of the 
Rights Agreement (including the date on which the Distribution Date shall 
occur, the time during which the Rights may be redeemed or the terms of the 
preferred Shares), except that no supplement or amendment shall be made which 
reduces the Redemption Price or provides for an earlier Expiration Date.

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

     The Rights Agreement specifying the terms of the Rights, the 
Certificate of Designation of the Preferred Shares specifying the terms of the 
Preferred Shares (Exhibit A to the Rights Agreement) and the form of Right 
Certificate (Exhibit B to the Rights Agreement) are filed herewith as 
exhibits.  The foregoing description of the Rights does not purport to be 
complete and is qualified in its entirety by reference to such exhibits, which 
are incorporated herein by reference.


Item 2. Exhibits.

     1.  Rights Agreement dated as of November 14, 1997, between Lightbridge, 
         Inc. and American Stock Transfer and Trust Company, as Rights Agent.

     2.  Form of Certificate of Designation of Series A Participating 
         Cumulative Preferred Stock of Lightbridge, Inc.(which is attached as
         Exhibit A to the Rights Agreement filed as Exhibit 1 hereto).

     3.  Form of Right Certificate (which is attached as Exhibit B to the 
         Rights Agreement filed as Exhibit 1 hereto).

                                      -5-
<PAGE>
 
                                   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, thereunto duly 
authorized.


                                    LIGHTBRIDGE, INC.



Dated: November 21, 1997            By: /s/ William G. Brown
                                       ---------------------------------
                                        William G. Brown
                                        Chief Financial Officer, Vice President
                                        of Finance and Administration, and 
                                        Treasurer

                                      -6-

<PAGE>
 
                                                                       Exhibit 1






                               RIGHTS AGREEMENT


                         Dated as of November 14, 1997


                                    between


                               LIGHTBRIDGE, INC.


                                      and
  

                   AMERICAN STOCK TRANSFER AND TRUST COMPANY

                                as Rights Agent
<PAGE>
 
                               Table of Contents
<TABLE> 
<CAPTION> 
Section                                                                 Page
<S>                                                                     <C>
SECTION 1.  Certain Definitions......................................     1
SECTION 2.  Appointment of Rights Agent..............................     7
SECTION 3.  Issue of Rights and Right Certificates...................     7
SECTION 4.  Form of Right Certificates...............................     8
SECTION 5.  Execution, Countersignature and Registration.............     9
SECTION 6.  Transfer, Split-Up, Combination and Exchange of Right 
            Certificates; Mutilated, Destroyed, Lost or Stolen Right 
            Certificates; Uncertificated Rights......................     9
SECTION 7.  Exercise of Rights; Expiration Date of Rights............    10
SECTION 8.  Cancellation and Destruction of Right Certificates.......    12
SECTION 9.  Reservation and Availability of Preferred Shares.........    12
SECTION 10. Preferred Shares Record Date.............................    13
SECTION 11. Adjustments in Rights After There Is an Acquiring Person; 
            Exchange of Rights for Shares; Business Combinations.....    13
SECTION 12. Certain Adjustments......................................    17
SECTION 13. Certificate of Adjustment................................    18
SECTION 14. Additional Covenants.....................................    19
SECTION 15. Fractional Rights and Fractional Shares..................    19
SECTION 16. Rights of Action.........................................    20
SECTION 17. Transfer and Ownership of Rights and Right Certificates..    20
SECTION 18. Right Certificate Holder Not Deemed a Stockholder........    21
SECTION 19. Concerning the Rights Agent..............................    21
SECTION 20. Merger or Consolidation or Change of Rights Agent........    21
SECTION 21. Duties of Rights Agent...................................    22
SECTION 22. Change of Rights Agent...................................    24
SECTION 23. Issuance of Additional Rights and Right Certificates.....    25
SECTION 24. Redemption and Termination...............................    25
SECTION 25. Notices..................................................    25
SECTION 26. Supplements and Amendments...............................    26
SECTION 27. Successors...............................................    27
SECTION 28. Benefits of Rights Agreement; Determinations and Actions 
             by the Board of  Directors, etc.........................    27
SECTION 29. Severability.............................................    27
SECTION 30. Governing Law............................................    28
SECTION 31. Counterparts; Effectiveness..............................    28
SECTION 32. Descriptive Headings.....................................    28
</TABLE> 

Exhibits

A   Certificate of Designation
B   Form of Right Certificate
<PAGE>
 
     This RIGHTS AGREEMENT, dated as of November 14, 1997, is made between 
LIGHTBRIDGE, INC., a Delaware corporation (the "Company"), and American Stock 
Transfer and Trust Company, a limited power banking trust company licensed by 
the New York State Banking Authority, as Rights Agent (the "Rights Agent").  

     The Board of Directors of the Company has authorized and declared a 
distribution of one Right (as hereinafter defined) for each share of Common 
Stock, par value $.01 per share, of the Company (the "Common Stock") 
outstanding at the Close of Business (as hereinafter defined) on November 14, 
1997 (the "Record Date"), and has authorized the issuance of one Right (as 
such number may hereafter be adjusted pursuant to the provisions of this 
Rights Agreement) with respect to each share of Common Stock that shall become 
outstanding between the Record Date and the earliest of the Distribution Date, 
the Redemption Date or the Expiration Date (as such terms are hereinafter 
defined); provided, however, that Rights may be issued with respect to shares 
of Common Stock that shall become outstanding after the Distribution Date and 
prior to the earlier of the Redemption Date or the Expiration Date in 
accordance with the provisions of Section 23.  Each Right shall initially 
represent the right to purchase one one-hundredth (1/100th) of a share of 
Series A Participating Cumulative Preferred Stock, par value $.01 per share, 
of the Company (the "Preferred Shares"), having the powers, rights and 
preferences set forth in the Certificate of Designation attached as Exhibit A.

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

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

     "Acquiring Person" shall mean any Person who or which, alone or together 
with all Affiliates and Associates of such Person, shall be the Beneficial 
Owner of Common Shares then outstanding that equals or exceeds such Person's 
Ownership Threshold, but shall not include (A) the Company, any Subsidiary of 
the Company, any employee benefit plan of the Company or of any of its 
Subsidiaries, or any Person holding Common Shares for or pursuant to the terms 
of any such employee benefit plan, or (B) any such Person who or which has 
become such a Beneficial Owner solely because (i) of a change in the aggregate 
number of Common Shares outstanding since the last date on which such Person 
acquired Beneficial Ownership of any Common Shares or (ii) it acquired such 
Beneficial Ownership in the good faith belief that such acquisition would not 
cause such Beneficial Ownership to exceed such Person's Ownership Threshold 
and such Person relied in good faith in computing the percentage of its 
Beneficial Ownership on publicly filed reports or documents of the Company 
which are inaccurate or out-of-date.  Notwithstanding clause (B) of the 
immediately preceding sentence, if any Person that is not an Acquiring Person 
due to such clause (B) does not reduce its percentage of Beneficial Ownership 
of Common Shares to an amount less than such Person's Ownership Threshold by 
the Close of Business on the fifth Business Day after notice from the Company 
(the date of notice being the first day) that such Person's Beneficial 
Ownership of Common Shares so exceeds such Person's Ownership Threshold, such 
Person shall, at the end of such five Business Day period, become an Acquiring 
Person (and such clause (B) shall no longer apply to such Person).  For 
purposes of this 

<PAGE>
 
definition, the determination whether any Person acted in "good faith" shall be
conclusively determined by the Board of Directors of the Company.

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

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

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

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

     (iii)    which are beneficially owned, directly or indirectly, by any 
other Person with which such Person or any of such Person's Affiliates or
Associates has any agreement, arrangement or understanding (written or oral) for
the purpose of acquiring, holding, voting (except pursuant to a revocable proxy
as described in clause (ii)(B) of this definition) or disposing of any
securities of the Company.

Notwithstanding the foregoing, nothing contained in this definition shall 
cause a Person ordinarily engaged in business as an underwriter of securities 
to be the "Beneficial Owner" of, or to "beneficially own", any securities 
acquired in a bona fide firm commitment underwriting pursuant to an 
underwriting agreement with the Company.

     "Book Value", when used with reference to Common Shares issued by any 
Person, shall mean the amount of equity of such Person applicable to each 
Common Share, determined (i) in accordance with generally accepted accounting 
principles in effect on the date as of which such Book Value is to be 
determined, (ii) using all the consolidated assets and all the consolidated 

                                      -2-
<PAGE>
 
liabilities of such Person on the date as of which such Book Value is to be 
determined, except that no value shall be included in such assets for goodwill 
arising from consummation of a business combination, and (iii) after giving 
effect to (A) the exercise of all rights, options and warrants to purchase 
such Common Shares (other than the Rights), and the conversion of all 
securities convertible into such Common Shares, at an exercise or conversion 
price, per Common Share, which is less than such Book Value before giving 
effect to such exercise or conversion (whether or not exercisability or 
convertibility is conditioned upon occurrence of a future event), (B) all 
dividends and other distributions on the capital stock of such Person declared 
prior to the date as of which such Book Value is to be determined and to be 
paid or made after such date, and (C) any other agreement, arrangement or 
understanding (written or oral), or transaction or other action prior to the 
date as of which such Book Value is to be determined which would have the 
effect of thereafter reducing such Book Value.

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

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

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

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

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

                                      -3-
<PAGE>
 
     "Common Stock" shall have the meaning set forth in the introductory 
paragraph of this Rights Agreement.

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

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

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

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

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

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

     "Formula Number" shall have the meaning set forth in Section 2 of the 
Certificate of Designation.

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

     "Market Value", when used with reference to any class of Common Shares on 
any date, shall be deemed to be the average of the daily closing prices, per 
share, of any such class for the period which is the shorter of (1) 30 
consecutive Trading Days immediately prior to the date in question or (2) the 
number of consecutive Trading Days beginning on the Trading Day immediately 
after the date of the first public announcement of a Business Combination with 
an Acquiring Person or Affiliate or Associate of an Acquiring Person requiring 
a determination of the Market Value and ending on the Trading Day immediately 
prior to the record date of such 

                                      -4-
<PAGE>
 
Business Combination; provided, however, that, in the event that the Market
Value of such class of Common Shares is to be determined in whole or in part
during a period following the announcement by the issuer of such class of Common
Shares of any action of the type described in Section 12(a) that would require
an adjustment thereunder, then, and in each such case, the Market Value of such
class shall be appropriately adjusted to reflect the effect of such action on
the market price of such class. The closing price for each Trading Day shall be
the closing price quoted on the composite tape for securities listed on the New
York Stock Exchange, or, if such securities are not quoted on such composite
tape or if such securities are not listed on such exchange, on the principal
United States securities exchange registered under the Exchange Act (or any
recognized foreign stock exchange) on which such securities are listed, or, if
such securities are not listed on any such exchange, the last quoted price or,
if not so quoted, the average of the high bid and low asked prices in the over-
the-counter market with respect to a share of such securities as reported by the
National Association of Securities Dealers, Inc. Automated Quotations System
("NASDAQ") or such other system then in use, or if no such quotations are
available, the average of the closing bid and asked prices as furnished by a
professional market maker making a market in such securities selected by the
Board of Directors of the Company. If on any such Trading Day no market maker is
making a market in such securities for any reason, the closing price of such
securities on such Trading Day shall be deemed to be the fair value of such
securities as determined in good faith by the Board of Directors of the Company
(whose determination shall be described in a statement filed with the Rights
Agent and shall be binding on the Rights Agent, the holders of Rights and all
other Persons); provided, however, that for the purpose of determining the
closing price of the Preferred Shares for any Trading Day on which there is no
such market maker for the Preferred Shares the closing price on such Trading Day
shall be deemed to be the Formula Number times the closing price of the Common
Stock of the Company on such Trading Day.

     "Ownership Threshold" shall mean, with respect to any Person, Beneficial 
Ownership of the greater of (A) 15% of the Common Shares at any time 
outstanding or (B) the percentage of the outstanding Common Shares 
Beneficially Owned by such Person on the date of this Rights Agreement, plus 
in the case of this clause (B) 1% of the Common Shares outstanding on such 
date.

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

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

     "Preferred Stock" shall mean the Preferred Stock, par value $.10 per 
share, of the Company.

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

                                      -5-
<PAGE>
 
Surviving Person is shared by two or more Persons, "Principal Party" shall 
mean that Person that is immediately controlled by such two or more Persons.

     "Purchase Price" with respect to each Right shall mean $75.00, as such 
amount may from time to time be adjusted as provided herein, and shall be 
payable in lawful money of the United States of America.  All references 
herein to the Purchase Price shall mean the Purchase Price as in effect at the 
time in question.

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

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

     "Redemption Price" with respect to each Right shall mean $.01, as such 
amount may from time to time be adjusted in accordance with Section 12.  All 
references herein to the Redemption Price shall mean the Redemption Price as 
in effect at the time in question.

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

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

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

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

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

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

                                      -6-
<PAGE>
 
     "Trading Day" when used with reference to the Market Value of a security, 
shall mean a day on which the principal national securities exchange (or 
principal recognized foreign stock exchange, as the case may be) on which such 
securities are listed or admitted to trading is open for the transaction of 
business or, if such securities in question are not listed or admitted to 
trading on any national securities exchange (or recognized foreign stock 
exchange, as the case may be), a Business Day.

     SECTION 2.  Appointment of Rights Agent.  The Company hereby appoints the 
Rights Agent to act as agent for the Company in accordance with the terms and 
conditions hereof, and the Rights Agent hereby accepts such appointment.  The 
Company may from time to time appoint one or more co-Rights Agents as it may 
deem necessary or desirable (the term "Rights Agent" being used herein to 
refer, collectively, to the Rights Agent together with any such co-Rights 
Agents).  In the event the Company appoints one or more co-Rights Agents, the 
respective duties of the Rights Agent and any co-Rights Agents shall be as the 
Company shall determine.

     SECTION 3.  Issue of Rights and Right Certificates.  (a) One Right shall 
be associated with each Common Share outstanding on the Record Date, each 
additional Common Share that shall become outstanding between the Record Date 
and the earliest of the Distribution Date, the Redemption Date or the 
Expiration Date and each additional Common Share with which Rights are issued 
after the Distribution Date but prior to the earlier of the Redemption Date or 
the Expiration Date as provided in Section 23, in each case subject to the 
provisions of Section 12.

     (b)      Until the earlier of (i) such time as the Company learns that a 
Person has become an Acquiring Person or (ii) the Close of Business on such 
date, if any, as may be designated by the Board of Directors of the Company 
following the commencement of, or first public disclosure of an intent to 
commence, a tender or exchange offer by any Person (other than the Company, 
any Subsidiary of the Company, any employee benefit plan of the Company or of 
any of its Subsidiaries, or any Person holding Common Shares for or pursuant 
to the terms of any such employee benefit plan) for outstanding Common Shares, 
if upon consummation of such tender or exchange offer such Person's Beneficial 
Ownership of Common Shares then outstanding could equal or exceed such 
Person's Ownership Threshold (the Close of Business on the earlier of such 
dates being the "Distribution Date"), (x) the Rights will be evidenced by the 
certificates for Common Shares registered in the names of the holders thereof 
and not by separate Right Certificates and (y) the Rights, including the right 
to receive Right Certificates, will be transferable only in connection with 
the transfer of Common Shares.  As soon as practicable after the Distribution 
Date, the Rights Agent will send, by first-class, postage-prepaid mail, to 
each record holder of Common Shares as of the Distribution Date, at the 
address of such holder shown on the records of the Company, a Right 
Certificate evidencing the Rights to which such holder is entitled.  As of and 
after the Distribution Date, the Rights will be evidenced solely by such Right 
Certificates.

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

                                      -7-
<PAGE>
 
     (d)      Certificates issued for Common Shares after the Record Date 
(including, without limitation, upon transfer or exchange of outstanding 
Common Shares), but prior to the earliest of the Distribution Date, the 
Redemption Date or the Expiration Date, may have printed on, written on or 
otherwise affixed to them the following legend:

            This certificate also evidences and entitles the holder hereof
            to certain Rights as set forth in a Rights Agreement dated as
            of November 14, 1997, as it may be amended from time to time
            (the "Rights Agreement"), between Lightbridge, Inc. (the
            "Company") and American Stock Transfer & Trust Company, as
            Rights Agent (the "Rights Agent"), the terms of which are
            hereby incorporated herein by reference and a copy of which is
            on file at the principal executive offices of the Company.
            Under certain circumstances, as set forth in the Rights
            Agreement, such Rights will be evidenced by separate
            certificates and will no longer be evidenced by this
            certificate. The Company will mail to the holder of this
            certificate a copy of the Rights Agreement without charge after
            receipt of a written request therefor. Rights beneficially
            owned by Acquiring Persons or their Affiliates or Associates
            (as such terms are defined in the Rights Agreement) and by any
            subsequent holder of such Rights are null and void and
            nontransferable.

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

     SECTION 4.  Form of Right Certificates.  The Right Certificates (and the 
form of election to purchase and form of assignment to be printed on the 
reverse side thereof) shall be in substantially the form set forth as Exhibit 
B and may have such marks of identification or designation and such legends, 
summaries or endorsements printed thereon as the Company may deem appropriate 
and as are not inconsistent with the provisions of this Rights Agreement, or 
as may be required to comply with any applicable law or with any rule or 
regulation made pursuant thereto or with any rule or regulation of any stock 
exchange on which the Rights may, from time to time be listed, or to conform 
to usage.  Subject to the provisions of Sections 7, 11 and 23, the Right 
Certificates, whenever issued, shall be dated as of the Distribution Date, and 
on their face shall entitle the holders thereof to purchase such number of 
Preferred Shares as shall be set forth therein for the Purchase Price set 
forth therein, subject to adjustment from time to time as herein provided.

     SECTION 5.  Execution, Countersignature and Registration.  (a)  The Right 
Certificates shall be executed on behalf of the Company by the Chief Executive 
Officer, the President, the Chief Financial Officer, the Treasurer or a Vice 
President (whether preceded by any additional title) of the Company, either 
manually or by facsimile signature, and have affixed thereto the Company's 
seal or a facsimile thereof which shall be attested by the Secretary, an 
Assistant Secretary or a Vice President (whether preceded by any additional 
title, provided that such Vice President shall not have also executed the 
Right Certificates) of the Company, either manually or by facsimile 
signature.  The Right Certificates shall be manually countersigned by the 
Rights Agent and shall not be valid or obligatory for any purpose unless so 
countersigned.  In case any officer of the Company who shall have signed any 
of the Right Certificates shall cease to be such an officer of the Company 
before countersignature by the Rights Agent and issuance and delivery by the 
Company, such Right Certificates may nevertheless be countersigned by the 
Rights Agent and issued and delivered by the 

                                      -8-
<PAGE>
 
Company with the same force and effect as though the person who signed such
Right Certificates had not ceased to be such an officer of the Company; and any
Right Certificate may be signed on behalf of the Company by any person who, at
the actual date of execution of such Right Certificate, shall be a proper
officer of the Company to sign such Right Certificate, although at the date of
execution of this Rights Agreement any such person was not such an officer of
the Company.

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

     SECTION 6.  Transfer, Split-Up, Combination and Exchange of Right 
Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificates; 
Uncertificated Rights.  (a) Subject to the provisions of Sections 7(e) and 15, 
at any time after the Distribution Date, and at or prior to the Close of 
Business on the earlier of the Redemption Date or the Expiration Date, any 
Right Certificate or Right Certificates may be transferred, split-up, combined 
or exchanged for another Right Certificate or Right Certificates representing, 
in the aggregate, the same number of Rights as the Right Certificate or Right 
Certificates surrendered then represented.  Any registered holder desiring to 
transfer, split-up, combine or exchange any Right Certificate shall make such 
request in writing delivered to the Rights Agent and shall surrender the Right 
Certificate or Right Certificates to be transferred, split-up, combined or 
exchanged at the office of the Rights Agent; provided, however, that neither 
the Rights Agent nor the Company shall be obligated to take any action 
whatsoever with respect to the transfer of any Right Certificate surrendered 
for transfer until the registered holder shall have completed and signed the 
certification contained in the form of assignment on the reverse side of such 
Right Certificate and shall have provided such additional evidence of the 
identity of the Beneficial Owner (or former Beneficial Owner) or Affiliates or 
Associates thereof as the Company shall reasonably request.  Thereupon the 
Rights Agent shall, subject to Sections 7(e) and 15, countersign and deliver 
to the Person entitled thereto a Right Certificate or Right Certificates, as 
the case may be, as so requested.  The Company may require payment of a sum 
sufficient to cover any tax or governmental charge that may be imposed in 
connection with any transfer, split-up, combination or exchange of Right 
Certificates.

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

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

                                      -9-
<PAGE>
 
     SECTION 7.  Exercise of Rights; Expiration Date of Rights.  (a) Subject 
to Section 7(e) and except as otherwise provided herein (including Section 
11), each Right shall entitle the registered holder thereof, upon exercise 
thereof as provided herein, to purchase for the Purchase Price, at any time 
after the Distribution Date and at or prior to the earlier of (i) the Close of 
Business on the 10th anniversary of the date of this Rights Agreement (the 
Close of Business on such date being the "Expiration Date") or (ii) the 
Redemption Date, one one-hundredth (1/100th) of a Preferred Share, subject to 
adjustment from time to time as provided in Sections 11 and 12. 

     (b)   The registered holder of any Right Certificate may exercise the 
Rights evidenced thereby (except as otherwise provided herein) in whole or in 
part at any time after the Distribution Date, upon surrender of the Right 
Certificate, with the form of election to purchase on the reverse side thereof 
duly executed, to the Rights Agent at the office of the Rights Agent in 
Brooklyn, New York, together with payment of the Purchase Price for each 
one-hundredth (1/100th) of a Preferred Share as to which the Rights are 
exercised, at or prior to the earlier of (i) the Expiration Date or (ii) the 
Redemption Date.

     (c)   Upon receipt of a Right Certificate representing exercisable 
Rights, with the form of election to purchase duly executed, accompanied by 
payment of the Purchase Price for the Preferred Shares to be purchased 
together with an amount equal to any applicable transfer tax, in lawful money 
of the United States of America, in cash or by certified check or money order 
payable to the order of the Company, the Rights Agent shall thereupon (i) 
either (A) promptly requisition from any transfer agent of the Preferred 
Shares (or make available, if the Rights Agent is the transfer agent) 
certificates for the number of Preferred Shares to be purchased and the 
Company hereby irrevocably authorizes its transfer agent to comply with all 
such requests or (B) if the Company shall have elected to deposit the 
Preferred Shares with a depositary agent under a depositary arrangement, 
promptly requisition from the depositary agent depositary receipts 
representing the number of one-hundredths (1/100ths) of a Preferred Share to 
be purchased (in which case certificates for the Preferred Shares to be 
represented by such receipts shall be deposited by the transfer agent with the 
depositary agent) and the Company will direct the depositary agent to comply 
with all such requests, (ii) when appropriate, promptly requisition from the 
Company the amount of cash to be paid in lieu of issuance of fractional shares 
in accordance with Section 15, (iii) promptly after receipt of such 
certificates or depositary receipts, cause the same to be delivered to or upon 
the order of the registered holder of such Right Certificate, registered in 
such name or names as may be designated by such holder and (iv) when 
appropriate, after receipt promptly deliver such cash to or upon the order of 
the registered holder of such Right Certificate.

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

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

                                      -10-
<PAGE>
 
     (f)      Notwithstanding anything in this Rights Agreement to the 
contrary, neither the Rights Agent nor the Company shall be obligated to 
undertake any action with respect to a registered holder of any Right 
Certificates upon the occurrence of any purported exercise as set forth in 
this Section 7 unless such registered holder shall have (i) completed and 
signed the certificate contained in the form of election to purchase set forth 
on the reverse side of the Right Certificate surrendered for such exercise and 
(ii) provided such additional evidence of the identity of the Beneficial Owner 
(or former Beneficial Owner) or Affiliates or Associates thereof as the 
Company shall reasonably request.

     (g)     The Company may temporarily suspend, for a period of time not to 
exceed 90 calendar days after the Distribution Date, the exercisability of the 
Rights in order to prepare and file a registration statement under the 
Securities Act, on an appropriate form, with respect to the Preferred Shares 
purchasable upon exercise of the Rights and permit such registration statement 
to become effective; provided, however, that no such suspension shall remain 
effective after, and the Rights shall without any further action by the 
Company or any other Person become exercisable immediately upon, the 
effectiveness of such registration statement.  Upon any such suspension, the 
Company shall issue a public announcement stating that the exercisability of 
the Rights has been temporarily suspended and shall issue a further public 
announcement at such time as the suspension is no longer in effect.  
Notwithstanding any provision herein to the contrary, the Rights shall not be 
exercisable in any jurisdiction if the requisite qualification under the blue 
sky or securities laws of such jurisdiction shall not have been obtained or 
the exercise of the Rights shall not be permitted under applicable law.

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

     SECTION 9. Reservation and Availability of Preferred Shares. (a) The 
Company covenants and agrees that it will cause to be reserved and kept 
available out of its authorized and unissued Preferred Shares or any 
authorized and issued Preferred Shares held in its treasury, free from 
preemptive rights or any right of first refusal, a number of Preferred Shares 
sufficient to permit the exercise in full of all outstanding Rights.

     (b)      In the event that there shall not be sufficient Preferred Shares 
issued but not outstanding or authorized but unissued to permit the exercise 
or exchange of Rights in accordance with Section 11, the Company covenants and 
agrees that it will take all such action as may be necessary to authorize 
additional Preferred Shares for issuance upon the exercise or exchange of 
Rights pursuant to Section 11; provided, however, that if the Company is 
unable to cause the 

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

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

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

     (e)     The Company further covenants and agrees that it will pay when 
due and payable any and all Federal and state transfer taxes and charges which 
may be payable in respect of the issuance or delivery of Right Certificates or 
of any Preferred Shares or other securities upon the exercise or exchange of 
the Rights.  The Company shall not, however, be required to pay any transfer 
tax which may be payable in respect of any transfer or delivery of Right 
Certificates to a Person other than, or in respect of the issuance or delivery 
of certificates for the Preferred Shares or other securities, as the case may 
be, in a name other than that of, the registered holder of the Right 
Certificate evidencing Rights surrendered for exercise or exchange or to issue 
or deliver any certificates for Preferred Shares or other securities, as the 
case may be, upon the exercise or exchange of any Rights until any such tax 
shall have been paid (any such tax being payable by the holder of such Right 
Certificate at the time of surrender) or until it has been established to the 
Company's satisfaction that no such tax is due.

     SECTION 10.  Preferred Shares Record Date.  Each Person in whose name any 
certificate for Preferred Shares or other securities is issued upon the 
exercise or exchange of Rights shall for all purposes be deemed to have become 
the holder of record of the Preferred Shares or other 

                                      -12-
<PAGE>
 
securities, as the case may be, represented thereby on, and such certificate
shall be dated, the date upon which the Right Certificate evidencing such Rights
was duly surrendered and payment of any Purchase Price (and any applicable
transfer taxes) was made; provided, however, that, if the date of such surrender
and payment is a date upon which the transfer books of the Company for the
Preferred Shares or other securities, as the case may be, are closed, such
Person shall be deemed to have become the record holder of such Preferred Shares
or other securities, as the case may be, on, and such certificate shall be
dated, the next succeeding Business Day on which the transfer books of the
Company for the Preferred Shares or other securities, as the case may be, are
open.

     SECTION 11.  Adjustments in Rights After There Is an Acquiring Person; 
Exchange of Rights for Shares; Business Combinations.  (a) Upon a Person 
becoming an Acquiring Person, proper provision shall be made so that each 
holder of a Right, except as provided in Section 7(e), shall thereafter have a 
right to receive, upon exercise thereof for the Purchase Price in accordance 
with the terms of this Rights Agreement, such number of one-hundredths 
(1/100ths) of a Preferred Share as shall equal the result obtained by 
multiplying the Purchase Price by a fraction, the numerator of which is the 
number of one-hundredths (1/100ths) of a Preferred Share for which a Right is 
then exercisable and the denominator of which is 50% of the Market Value of 
the Common Stock on the date on which a Person becomes an Acquiring Person.  
As soon as practicable after a Person becomes an Acquiring Person (provided 
the Company shall not have elected to make the exchange permitted by Section 
11(b)(I) for all outstanding Rights), the Company covenants and agrees to use 
its best efforts to:

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

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

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

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

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

                                      -13-
<PAGE>
 
this Rights Agreement holders of Rights shall be deemed to have simultaneously
received and surrendered for exchange Right Certificates on the date of such
distribution.

          (II)     Any action of the Board of Directors of the Company 
ordering the exchange of any Rights pursuant to Section 11(b)(I) shall be 
irrevocable and, immediately upon the taking of such action and without any 
further action and without any notice, the right to exercise any such Right 
pursuant to Section 11(a) shall terminate and the only right thereafter of a 
holder of such Right shall be to receive the Exchange Consideration in 
exchange for each such Right held by such holder or, if the Exchange 
Consideration shall not have been paid or issued, to exercise any such Right 
pursuant to Section 11(c)(I).  The Company shall promptly give public notice 
of any such exchange; provided, however, that the failure to give, or any 
defect in, such notice shall not affect the validity of such exchange.  The 
Company promptly shall mail a notice of any such exchange to all holders of 
such Rights at their last addresses as they appear upon the registry books of 
the Rights Agent.  Any notice which is mailed in the manner herein provided 
shall be deemed given, whether or not the holder receives the notice.  Each 
such notice of exchange will state the method by which the exchange of the 
Rights for the Exchange Consideration will be effected and, in the event of 
any partial exchange, the number of Rights which will be exchanged.  Any 
partial exchange shall be effected pro rata based on the number of Rights 
(other than Rights which shall have become null and void and nontransferable 
pursuant to the provisions of Section 7(e)) held by each holder of Rights.

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

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

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

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

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

     (A)     If the Principal Party in such Business Combination has 
Registered Common Shares outstanding, each Right shall thereafter represent 
the right to receive, upon the exercise thereof for the Purchase Price in 
accordance with the terms of this Rights 

                                      -14-
<PAGE>
 
Agreement, such number of Registered Common Shares of such Principal Party, free
and clear of all liens, encumbrances or other adverse claims, as shall have an
aggregate Market Value equal to the result obtained by multiplying the Purchase
Price by two;

     (B)     If the Principal Party involved in such Business Combination does 
not have Registered Common Shares outstanding, each Right shall thereafter 
represent the right to receive, upon the exercise thereof for the Purchase 
Price in accordance with the terms of this Rights Agreement, at the election 
of the holder of such Right at the time of the exercise thereof, any of:

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

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

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

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

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

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

     (A)     executed and delivered to the Rights Agent a supplemental 
agreement providing for the assumption by such issuer of the obligations set 
forth in this Section 11(c) (including the obligation of such issuer to issue 
Common Shares upon the exercise of Rights in accordance with the terms set 
forth in Sections 11(c)(I) and 

                                      -15-
<PAGE>
 
11(c)(III)) and further providing that such issuer, at its own expense, will use
its best efforts to:

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

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

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

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

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

          (III)     After consummation of any Business Combination and subject 
to the provisions of Section 11(c)(II), (i) each issuer of Common Shares for 
which Rights may be exercised as set forth in this Section 11(c) shall be 
liable for, and shall assume, by virtue of such Business Combination, all the 
obligations and duties of the Company pursuant to this Rights Agreement, (ii) 
the term "Company" shall thereafter be deemed to refer to such issuer, (iii) 
each such issuer shall take such steps in connection with such consummation as 
may be necessary to assure that the provisions hereof (including the 
provisions of Sections 11(a) and 11(c)) shall thereafter be applicable, as 
nearly as reasonably may be, in relation to its Common Shares thereafter 
deliverable upon the exercise of the Rights, and (iv) the number of Common 
Shares of each such issuer thereafter receivable upon exercise of any Right 
shall be subject to adjustment from time to time in a manner and on terms as 
nearly equivalent as practicable to the provisions of Sections 11 and 12, and 
the provisions of Section 7, 9 and 10 with respect to the Preferred Shares 
shall apply, as nearly as reasonably may be, on like terms to any such Common 
Shares.

     SECTION 12.  Certain Adjustments.  (a) To preserve the actual or 
potential economic value of the Rights, if at any time after the date of this 
Rights Agreement there shall be any change in the Common Shares or the 
Preferred Shares, whether by reason of stock dividends, stock splits, 
recapitalizations, mergers, consolidations, combinations or exchanges of 
securities, split-ups, split-

                                      -16-
<PAGE>
 
offs, spin-offs, liquidations, other similar changes in capitalization, any
distribution or issuance of cash, assets, evidences of indebtedness or
subscription rights, options or warrants to holders of Common Shares or
Preferred Shares, as the case may be (other than distribution of the Rights or
regular quarterly cash dividends) or otherwise, then, in each such event the
Board of Directors of the Company shall make such appropriate adjustments in the
number of Preferred Shares (or the number and kind of other securities) issuable
upon exercise of each Right, the Purchase Price and Redemption Price in effect
at such time and the number of Rights outstanding at such time (including the
number of Rights or fractional Rights associated with each Common Share) such
that following such adjustment such event shall not have had the effect of
reducing or limiting the benefits the holders of the Rights would have had
absent such event.

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

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

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

     (e)     In any case in which action taken pursuant to Section 12(a) 
requires that an adjustment be made effective as of a record date for a 
specified event, the Company may elect to defer until the occurrence of such 
event the issuing to the holder of any Right exercised after such record date 
the Preferred Shares and/or other securities, if any, issuable upon such 
exercise over and above the Preferred Shares and/or other securities, if any, 
issuable before giving effect to such adjustment; provided, however, that the 
Company shall deliver to such holder a due bill or other appropriate 
instrument evidencing such holder's right to receive such additional 
securities upon the occurrence of the event requiring such adjustment.

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

                                      -17-
<PAGE>
 
     SECTION 14.  Additional Covenants.  (a) Notwithstanding any other 
provision of this Rights Agreement, no adjustment to the number of Preferred 
Shares (or fractions of a share) or other securities for which a Right is 
exercisable or the number of Rights outstanding or associated with each Common 
Share or any similar or other adjustment shall be made or be effective if such 
adjustment would have the effect of reducing or limiting the benefits the 
holders of the Rights would have had absent such adjustment, including, 
without limitation, the benefits under Sections 11 and 12, unless the terms of 
this Rights Agreement are amended so as to preserve such benefits.

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

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

     (b)     The Company may, but shall not be required to, issue fractions of 
Preferred Shares upon exercise of the Rights or distribute certificates which 
evidence fractional Preferred Shares.  In lieu of fractional Preferred Shares, 
the Company may elect to (i) utilize a depository arrangement as provided by 
the terms of the Preferred Shares or (ii) in the case of a fraction of a 
Preferred Share (other than one one-hundredth (1/100th) of a Preferred Share 
or any integral multiple thereof), pay to the registered holders of Right 
Certificates at the time such Rights are exercised as herein provided an 
amount in cash equal to the same fraction of the current market value of one 
Preferred Share, if any are outstanding and publicly traded (or the Formula 
Number times the current market value of one share of Common Stock if the 
Preferred Shares are not outstanding and publicly traded).  If, as a result of 
an adjustment made pursuant to Section 12(a), the holder of any Right 
thereafter exercised shall become entitled to receive any securities other 
than Preferred Shares, the provisions of this Section 15(b) shall apply, as 
nearly as reasonably may be, on like terms to such other securities.

     (c)     The Company may, but shall not be required to, issue fractions of 
shares of Common Stock upon exchange of Rights pursuant to Section 11(b), or 
to distribute certificates which evidence 

                                      -18-
<PAGE>
 
fractional shares of Common Stock. In lieu of such fractional shares of Common
Stock, the Company may 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 one share of Common Stock as of the date on which a Person became an
Acquiring Person.

     (d)     The holder of Rights by the acceptance of the Rights expressly 
waives his right to receive any fractional Rights or any fractional shares 
upon exercise of a Right except as provided in this Section 15.

     SECTION 16.  Rights of Action.  (a) All rights of action in respect of 
this Rights Agreement are vested in the respective registered holders of the 
Right Certificates (and, prior to the Distribution Date, the registered 
holders of the Common Shares); and any registered holder of any Right 
Certificate (or, prior to the Distribution Date, of the Common Shares), 
without the consent of the Rights Agent or of the holder of any other Right 
Certificate (or, prior to the Distribution Date, of the Common Shares) may, in 
his own behalf and for his own benefit, enforce, and may institute and 
maintain any suit, action or proceeding against the Company to enforce, or 
otherwise act in respect of, his right to exercise the Rights evidenced by 
such Right Certificate in the manner provided in such Right Certificate and in 
this Rights Agreement.  Without limiting the foregoing or any remedies 
available to the holders of Rights, it is specifically acknowledged that the 
holders of Rights would not have an adequate remedy at law for any breach of 
this Rights Agreement and shall be entitled to specific performance of the 
obligations of any Person under, and injunctive relief against actual or 
threatened violations of the obligations of any Person subject to, this Rights 
Agreement.

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

     SECTION 17.  Transfer and Ownership of Rights and Right Certificates.  
(a)  Prior to the Distribution Date, the Rights will be transferable only in 
connection with the transfer of the Common Shares.

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

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

     SECTION 18.  Right Certificate Holder Not Deemed a Stockholder.  No 
holder, as such, of any Right Certificate shall be entitled to vote or receive 
dividends or be deemed, for any purpose, the holder of the Preferred Shares or 
of any other securities of the Company which may at any time be issuable on 
the exercise of the Rights represented thereby, nor shall anything contained 
herein or 

                                      -19-
<PAGE>
 
in any Right Certificate be construed to confer upon the holder of any Right
Certificate, as such, any of the rights of a stockholder of the Company,
including, without limitation, any right to vote for the election of directors
or upon any matter submitted to stockholders at any meeting thereof, or to give
or withhold consent to any corporate action, or to receive notice of meetings or
other actions affecting stockholders, or to receive dividends or other
distributions or subscription rights, or otherwise, until the Right or Rights
evidenced by such Right Certificate shall have been exercised in accordance with
the provisions hereof.

     SECTION 19.  Concerning the Rights Agent.  (a)  The Company agrees to pay 
to the Rights Agent reasonable compensation for all services rendered by it 
hereunder and from time to time, on demand of the Rights Agent, its reasonable 
expenses and counsel fees and other disbursements incurred in the 
administration and execution of this Rights Agreement and the exercise and 
performance of its duties hereunder.

     (b)     The Rights Agent shall be protected and shall incur no liability 
for or in respect of any action taken, suffered or omitted by it in connection 
with its administration of this Rights Agreement in reliance upon any Right 
Certificate or certificate for the Common Shares or for other securities of 
the Company, instrument of assignment or transfer, power of attorney, 
endorsement, affidavit, letter, notice, direction, consent, certificate, 
statement, or other paper or document believed by it to be genuine and to be 
signed, executed and, where necessary, verified or acknowledged, by the proper 
Person or Persons.

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

                                      -20-
<PAGE>
 
     SECTION 21.  Duties of Rights Agent.  The Rights Agent undertakes the 
duties and obligations imposed by this Rights Agreement upon the following 
terms and conditions, by all of which the Company and the holders of Right 
Certificates (or, prior to the Distribution Date, of the Common Shares), by 
their acceptance thereof, shall be bound:

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

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

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

     (d)     The Rights Agent shall not be liable for or by reason of any of 
the statements of fact or recitals contained in this Rights Agreement or in 
the Right Certificates (except as to its countersignature thereof) or be 
required to verify the same, but all such statements and recitals are and 
shall be deemed to have been made by the Company only.

     (e)     The Rights Agent shall not be under any responsibility in respect 
of the validity of this Rights Agreement or the execution and delivery hereof 
(except the due execution hereof by the Rights Agent) or in respect of the 
validity or execution of any Right Certificate (except its countersignature 
thereof); nor shall it be responsible for any breach by the Company of any 
covenant or condition contained in this Rights Agreement or in any Right 
Certificate; nor shall it be responsible for any adjustment required under the 
provisions of Section 11 or 12 or responsible for the manner, method or amount 
of any such adjustment or the ascertaining of the existence of facts that 
would require any such adjustment (except with respect to the exercise of 
Rights evidenced by Right Certificates after actual notice of any such 
adjustment); nor shall it by any act hereunder be deemed to make any 
representation or warranty as to the authorization or reservation of any 
Preferred Shares or Common Shares to be issued pursuant to this Rights 
Agreement or any Right Certificate or as to whether any Preferred Shares or 
Common Shares will, when so issued, be validly authorized and issued, fully 
paid and nonassessable.

     (f)     The Company agrees that it will perform, execute, acknowledge and 
deliver or cause to be performed, executed, acknowledged and delivered all 
such further and other acts, instruments 

                                      -21-
<PAGE>
 
and assurances as may reasonably be required by the Rights Agent for the
carrying out or performing by the Rights Agent of the provisions of this Rights
Agreement.

     (g)     The Rights Agent is hereby authorized and directed to accept 
instructions with respect to the performance of its duties hereunder from any 
one of  the Chief Executive Officer, the President,  the Chief  Financial 
Officer, the Treasurer, a Vice President (whether preceded by any additional 
title) or the Secretary of the Company, in connection with its duties and it 
shall not be liable for any action taken or suffered to be taken by it in good 
faith in accordance with instructions of any such officer.

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

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

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

     SECTION 22.  Change of Rights Agent.  The Rights Agent or any successor 
Rights Agent may resign and be discharged from its duties under this Rights 
Agreement upon 30 days' notice in 

                                      -22-
<PAGE>
 
writing mailed to the Company and to each transfer agent of the Common Shares
and the Preferred Shares by registered or certified mail, and to the holders of
the Right Certificates (or, prior to the Distribution Date, of the Common
Shares) by first-class mail, postage prepaid. The Company may remove the Rights
Agent or any successor Rights Agent upon 30 days' notice in writing, mailed to
the Rights Agent or successor Rights Agent, as the case may be, and to each
transfer agent of the Common Shares and the Preferred Shares by registered or
certified mail, and to the holders of the Right Certificates (or, prior to the
Distribution Date, of the Common Shares) by first-class mail. If the Rights
Agent shall resign or be removed or shall otherwise become incapable of acting,
the Company shall appoint a successor to the Rights Agent. If the Company shall
fail to make such appointment within a period of 30 days after giving notice of
such removal or after it has been notified in writing of such resignation or
incapacity by the resigning or incapacitated Rights Agent or by the holder of a
Right Certificate (or, prior to the Distribution Date, of the Common Shares)
(who shall, with such notice, submit his Right Certificate or, prior to the
Distribution Date, the certificate representing his Common Shares, for
inspection by the Company), then the registered holder of any Right Certificate
(or, prior to the Distribution Date, of the Common Shares) may apply to any
court of competent jurisdiction for the appointment of a new Rights Agent. Any
successor Rights Agent, whether appointed by the Company or by such a court,
shall be a corporation organized and doing business under the laws of the United
States or of any state of the United States, in good standing, which is
authorized under such laws to exercise stock transfer or corporate trust powers
and is subject to supervision or examination by Federal or state authority and
which has at the time of its appointment as Rights Agent a combined capital and
surplus of at least $50,000,000; provided that the principal transfer agent for
the Common Shares shall in any event be qualified to be the Rights Agent. After
appointment, the successor Rights Agent shall be vested with the same powers,
rights, duties and responsibilities as if it had been originally named as Rights
Agent without further act or deed; but the predecessor Rights Agent shall
deliver and transfer to the successor Rights Agent any property at the time held
by it hereunder, and execute and deliver any further assurance, conveyance, act
or deed necessary for the purpose. Not later than the effective date of any such
appointment, the Company shall file notice thereof in writing with the
predecessor Rights Agent and each transfer agent of the Common Shares and the
Preferred Shares, and mail a notice thereof in writing to the registered holders
of the Right Certificates (or, prior to the Distribution Date, of the Common
Shares). Failure to give any notice provided for in this Section 22, however, or
any defect therein shall not affect the legality or validity of the resignation
or removal of the Rights Agent or the appointment of the successor Rights Agent,
as the case may be.

     SECTION 23.  Issuance of Additional Rights and Right Certificates.  
Notwithstanding any of the provisions of this Rights Agreement or of the 
Rights to the contrary, the Company may, at its option, issue new Right 
Certificates evidencing Rights in such form as may be approved by its Board of 
Directors to reflect any adjustment or change made in accordance with the 
provisions of this Rights Agreement.  In addition, in connection with the 
issuance or sale of Common Shares following the Distribution Date and prior to 
the earlier of the Redemption Date and the Expiration Date, the Company (a) 
shall, with respect to Common Shares so issued or sold pursuant to the 
exercise of stock options or under any employee plan or arrangement, or upon 
the exercise, conversion or exchange of securities, notes or debentures issued 
by the Company, and (b) may, in any other case, if deemed necessary or 
appropriate by its 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 Certificate 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 

                                      -23-
<PAGE>
 
to the Company or the Person to whom such Right Certificate would be issued, and
(ii) no such Right Certificate shall be issued if, and to the extent that,
appropriate adjustment shall otherwise have been made in lieu of the issuance
thereof.

     SECTION 24.  Redemption and Termination.  (a) The Board of Directors of 
the Company may, at its option, at any time prior to the earlier of (i) such 
time as a Person becomes an Acquiring Person and (ii) the Expiration Date, 
order the redemption of all, but not fewer than all, the then outstanding 
Rights at the Redemption Price (the date of such redemption being the 
"Redemption Date"), and the Company, at its option, may pay the Redemption 
Price either in cash or Common Shares or other securities of the Company 
deemed by the Board of Directors of the Company, in the exercise of its sole 
discretion, to be at least equivalent in value to the Redemption Price. 

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

     SECTION 25.  Notices.  Notices or demands authorized by this Rights 
Agreement to be given or made by the Rights Agent or by the holder of a Right 
Certificate (or, prior to the Distribution Date, of the Common Shares) to or 
on the Company shall be sufficiently given or made if sent by first-class 
mail, postage prepaid, addressed (until another address is filed in writing 
with the Rights Agent) as follows:

          Lightbridge, Inc.
          67 South Bedford Street
          Burlington, Massachusetts 01803

          Attention of Chief Executive Officer   

Subject to the provisions of Section 22, any notice or demand authorized by 
this Rights Agreement to be given or made by the Company or by the holder of a 
Right Certificate (or, prior to the Distribution Date, of the Common Shares) 
to or on the Rights Agent shall be sufficiently given or made if sent by 
first-class mail, postage prepaid, addressed (until another address is filed 
in writing with the Company) as follows:

          American Stock Transfer and Trust Company
          6201 15th Avenue, 3rd Floor
          Brooklyn, New York  11219
          Attention of Vice President, Administration
     

                                      -24-
<PAGE>
 
Notices or demands authorized by this Rights Agreement to be given or made by 
the Company or the Rights Agent to any holder of a Right Certificate (or, 
prior to the Distribution Date, of the Common Shares) shall be sufficiently 
given or made if sent by first-class mail, postage prepaid, addressed to such 
holder at the address of such holder as shown on the registry books of the 
Rights Agent or, prior to the Distribution Date, on the registry books of the 
transfer agent for the Common Shares.

     SECTION 26.  Supplements and Amendments.  At any time prior to the 
Distribution Date and subject to the last sentence of this Section 26, the 
Company may, and the Rights Agent shall if the Company so directs, supplement 
or amend any provision of this Rights Agreement (including, without 
limitation, the date on which the Distribution Date shall occur, the time 
during which the Rights may be redeemed pursuant to Section 24 or any 
provision of the Certificate of Designation) without the approval of any 
holder of the Rights.  From and after the Distribution Date and subject to 
applicable law, the Company may, and the Rights Agent shall if the Company so 
directs, amend this Rights Agreement without the approval of any holders of 
Right Certificates (i) to cure any ambiguity or to correct or supplement any 
provision contained herein which may be defective or inconsistent with any 
other provision of this Rights Agreement or (ii) to make any other provisions 
in regard to matters or questions arising hereunder which the Company may deem 
necessary or desirable and which shall not adversely affect the interests of 
the holders of Right Certificates (other than an Acquiring Person or an 
Affiliate or Associate of an Acquiring Person).  Any supplement or amendment 
adopted during any period after any Person has become an Acquiring Person but 
prior to the Distribution Date shall be null and void unless such supplement 
or amendment could have been adopted under the prior sentence from and after 
the Distribution Date.  Any supplement or amendment to this Rights Agreement 
duly approved by the Company that does not amend Sections 19, 20, 21 or 22 in 
a manner adverse to the Rights Agent shall become effective immediately upon 
execution by the Company, whether or not also executed by the Rights Agent.  
In addition, notwithstanding anything to the contrary contained in this Rights 
Agreement, no supplement or amendment to this Rights Agreement shall be made 
which (a) reduces the Redemption Price (except as required by Section 12(a)) 
or (b) provides for an earlier Expiration Date.

     SECTION 27.  Successors.  All the covenants and provisions of this Rights 
Agreement by or for the benefit of the Company or the Rights Agent shall bind 
and inure to the benefit of their respective successors and assigns hereunder.

     SECTION 28.  Benefits of Rights Agreement; Determinations and Actions by 
the Board of Directors, etc.  (a) Nothing in this Rights Agreement shall be 
construed to give to any Person other than the Company, the Rights Agent and 
the registered holders of the Right Certificates (and, prior to the 
Distribution Date, of the Common Shares) any legal or equitable right, remedy 
or claim under this Rights Agreement; but this Rights Agreement shall be for 
the sole and exclusive benefit of the Company, the Rights Agent and the 
registered holders of the Right Certificates (and, prior to the Distribution 
Date, of the Common Shares).

     (b)     Except as explicitly otherwise provided in this Rights Agreement, 
the Board of Directors of the Company shall have the exclusive power and 
authority to administer this Rights Agreement and to exercise all rights and 
powers specifically granted to the Board of Directors of the 

                                      -25-
<PAGE>
 
Company or to the Company, or as may be necessary or advisable in the
administration of this Rights Agreement, including, without limitation, the
right and power to (i) interpret the provisions of this Rights Agreement and
(ii) make all determinations deemed necessary or advisable for the
administration of this Rights Agreement (including, without limitation, a
determination to redeem or not redeem the Rights or to amend this Rights
Agreement and a determination of whether there is an Acquiring Person).

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

     SECTION 29.  Severability.  If any term, provision, covenant or 
restriction of this Rights Agreement is held by a court of competent 
jurisdiction or other authority to be invalid, void or unenforceable, the 
remainder of the terms, provisions, covenants and restrictions of this Rights 
Agreement shall remain in full force and effect and shall in no way be 
affected, impaired or invalidated.

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

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

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

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

                         LIGHTBRIDGE, INC.



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

                                      -26-
<PAGE>
 
                         AMERICAN STOCK TRANSFER AND TRUST
                          COMPANY as Rights Agent
         

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

                                      -27-
<PAGE>
 
                                                                       EXHIBIT A

                       CERTIFICATE OF THE VOTING POWERS,
                    DESIGNATIONS, PREFERENCES AND RELATIVE
                  PARTICIPATING, OPTIONAL AND OTHER SPECIAL 
                    RIGHTS AND QUALIFICATIONS, LIMITATIONS
                          OR RESTRICTIONS OF SERIES A
                           PARTICIPATING CUMULATIVE
                              PREFERRED STOCK OF
                               LIGHTBRIDGE, INC.

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

     That, pursuant to the authority conferred upon the Board of Directors of 
the Corporation by Paragraph B of Article FOURTH of the Certification of 
Incorporation of the Corporation (the "Certificate of Incorporation"), the 
Board of Directors of the Corporation on November 14, 1997, adopted the 
following resolution creating a series of Preferred Stock designated as Series 
A Participating Cumulative Preferred Stock:

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

     SECTION 1.  Designation and Number of Shares.  The shares of such series 
shall be designated as "Series A Participating Cumulative Preferred Stock" 
(the "Series A Preferred Stock"), par value $.01 per share.  The number of 
shares initially constituting the Series A Preferred Stock shall be 600,000; 
provided, however, that, if more than a total of 600,000 shares of Series A 
Preferred Stock shall be issuable upon the exercise of Rights (the "Rights") 
issued pursuant to the Rights Agreement dated as of November 14, 1997, between 
the Corporation and American Stock Transfer and Trust Company, a limited power 
banking trust company licensed by the New York State Banking Authority, as 
Rights Agent (the "Rights Agreement"), the Board of Directors of the 
Corporation, pursuant to Section 151(g) of the General Corporation Law of the 
State of Delaware, shall direct by resolution or resolutions that a 
certificate be properly executed, acknowledged, filed and recorded, in 
accordance with the provisions of Section 103 thereof, providing for the total 
number of shares of Series A Preferred Stock authorized to be issued to be 
increased (to the extent that the Certificate of Incorporation then permits) 
to the largest number of whole shares (rounded up to the nearest whole number) 
issuable upon exercise of such Rights.

     SECTION 2.  Dividends or Distributions.  (a) Subject to the prior and 
superior rights of the holders of shares of any other series of Preferred 
Stock or other class of capital stock of the Corporation ranking prior and 
superior to the shares of Series A Preferred Stock with respect to dividends, 
the holders of shares of the Series A Preferred Stock shall be entitled to 
receive, when, 

<PAGE>
 
as and if declared by the Board of Directors, out of the assets of the
Corporation legally available therefor, (1) quarterly dividends payable in cash
on the last day of each fiscal quarter in each year, or such other dates as the
Board of Directors of the Corporation shall approve (each such date being
referred to herein as a "Quarterly Dividend Payment Date"), commencing on the
first Quarterly Dividend Payment Date after the first issuance of a share or a
fraction of a share of Series A Preferred Stock, in the amount of $1.00 per
whole share (rounded to the nearest cent) less the amount of all cash dividends
declared on the Series A Preferred Stock pursuant to the following clause (2)
since the immediately preceding Quarterly Dividend Payment Date or, with respect
to the first Quarterly Dividend Payment Date, since the first issuance of any
share or fraction of a share of Series A Preferred Stock (the total of which
shall not, in any event, be less than zero) and (2) dividends payable in cash on
the payment date for each cash dividend declared on the Common Stock in an
amount per whole share (rounded to the nearest cent) equal to the Formula Number
(as hereinafter defined) then in effect times the cash dividends then to be paid
on each share of Common Stock. In addition, if the Corporation shall pay any
dividend or make any distribution on the Common Stock payable in assets,
securities or other forms of noncash consideration (other than dividends or
distributions solely in shares of Common Stock), then, in each such case, the
Corporation shall simultaneously pay or make on each outstanding whole share of
Series A Preferred Stock a dividend or distribution in like kind equal to the
Formula Number then in effect times such dividend or distribution on each share
of the Common Stock. As used herein, the "Formula Number" shall be 100;
provided, however, that if at any time after November 14, 1997, the Corporation
shall (i) declare or pay any dividend on the Common Stock payable in shares of
Common Stock or make any distribution on the Common Stock in shares of Common
Stock, (ii) subdivide (by a stock split or otherwise) the outstanding shares of
Common Stock into a larger number of shares of Common Stock or (iii) combine (by
a reverse stock split or otherwise) the outstanding shares of Common Stock into
a smaller number of shares of Common Stock, then in each such event the Formula
Number shall be adjusted to a number determined by multiplying the Formula
Number in effect immediately prior to such event by a fraction, the numerator of
which is the number of shares of Common Stock that are outstanding immediately
after such event and the denominator of which is the number of shares of Common
Stock that are outstanding immediately prior to such event (and rounding the
result to the nearest whole number); and provided further, that, if at any time
after November 14, 1997, the Corporation shall issue any shares of its capital
stock in a merger, reclassification, or change of the outstanding shares of
Common Stock, then in each such event the Formula Number shall be appropriately
adjusted to reflect such merger, reclassification or change so that each share
of Series A Preferred Stock continues to be the economic equivalent of a Formula
Number of shares of Common Stock prior to such merger, reclassification or
change.

     (b)     The Corporation shall declare a dividend or distribution on the 
Series A Preferred Stock as provided in Section 2(a) immediately prior to or 
at the same time it declares a dividend or distribution on the Common 
Stock(other than a dividend or distribution solely in shares of Common Stock); 
provided, however, that, in the event no dividend or distribution (other than 
a dividend or distribution in shares of Common Stock) shall have been declared 
on the Common Stock during the period between any Quarterly Dividend Payment 
Date and the next subsequent Quarterly Dividend Payment Date, a dividend of 
$1.00 per share on the Series A Preferred Stock shall nevertheless be payable 
on such subsequent Quarterly Dividend Payment Date.  The Board of Directors 
may fix a record date for the determination of holders of shares of Series A 
Preferred Stock entitled to receive a dividend or distribution declared 
thereon, which record date shall be the same as the record date for any 
corresponding dividend or distribution on the Common Stock.

                                      -2-
<PAGE>
 
     (c)     Dividends shall begin to accrue and be cumulative on outstanding 
shares of Series A Preferred Stock from and after the Quarterly Dividend 
Payment Date next preceding the date of original issue of such shares of 
Series A Preferred Stock; provided, however, that dividends on such shares 
which are originally issued after the record date for the determination of 
holders of shares of Series A Preferred Stock entitled to receive a quarterly 
dividend and on or prior to the next succeeding Quarterly Dividend Payment 
Date shall begin to accrue and be cumulative from and after such Quarterly 
Dividend Payment Date.  Notwithstanding the foregoing, dividends on shares of 
Series A Preferred Stock which are originally issued prior to the record date 
for the determination of holders of shares of Series A Preferred Stock 
entitled to receive a quarterly dividend on the first Quarterly Dividend 
Payment Date shall be calculated as if cumulative from and after the last day 
of the fiscal quarter next preceding the date of original issuance of such 
shares.  Accrued but unpaid dividends shall not bear interest.  Dividends paid 
on the shares of Series A Preferred Stock in an amount less than the total 
amount of such dividends at the time accrued and payable on such shares shall 
be allocated pro rata on a share-by-share basis among all such shares at the 
time outstanding.

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

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

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

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

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

     (c)     If, at the time of any annual meeting of stockholders for the 
election of directors, the equivalent of six quarterly dividends (whether or 
not consecutive) payable on any share or shares of Series A Preferred Stock 
are in default, the number of directors constituting the Board of Directors of 
the Corporation shall be increased by two.  In addition to voting together 
with the holders of Common Stock for the election of other directors of the 
Corporation, the holders of record of the Series 

                                      -3-
<PAGE>
 
A Preferred Stock, voting separately as a class to the exclusion of the holders
of Common Stock, shall be entitled at said meeting of stockholders (and at each
subsequent annual meeting of stockholders), unless all dividends in arrears have
been paid or declared and set apart for payment prior thereto, to vote for the
election of two directors of the Corporation, the holders of any Series A
Preferred Stock being entitled to cast a number of votes per share of Series A
Preferred Stock equal to the Formula Number. Until the default in payments of
all dividends which permitted the election of said directors shall cease to
exist, any director who shall have been so elected pursuant to the next
preceding sentence may be removed at any time, either with or without cause,
only by the affirmative vote of the holders of the shares of Series A Preferred
Stock at the time entitled to cast a majority of the votes entitled to be cast
for the election of any such director at a special meeting of such holders
called for that purpose, and any vacancy thereby created may be filled by the
vote of such holders. If and when such default shall cease to exist, the holders
of the Series A Preferred Stock shall be divested of the foregoing special
voting rights, subject to revesting in the event of each and every subsequent
like default in payments of dividends. Upon the termination of the foregoing
special voting rights, the terms of office of all persons who may have been
elected directors pursuant to said special voting rights shall forthwith
terminate, and the number of directors constituting the Board of Directors shall
be reduced by two. The voting rights granted by this Section 3(c) shall be in
addition to any other voting rights granted to the holders of the Series A
Preferred Stock in this Section 3.

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

     SECTION 4.  Certain Restrictions.  (a) Whenever quarterly dividends or 
other dividends or distributions payable on the Series A Preferred Stock as 
provided in Section 2 are in arrears, thereafter and until all accrued and 
unpaid dividends and distributions, whether or not declared, on shares of 
Series A Preferred Stock outstanding shall have been paid in full, the 
Corporation shall not

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

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

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

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

                                      -4-
<PAGE>
 
Directors, after consideration of the respective annual dividend rates and other
relative rights and preferences of the respective series and classes, shall
determine in good faith will result in fair and equitable treatment among the
respective series or classes.

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

     SECTION 5.  Liquidation Rights.  Upon the liquidation, dissolution or 
winding up of the Corporation, whether voluntary or involuntary, no 
distribution shall be made (1) to the holders of shares of stock ranking 
junior (either as to dividends or upon liquidation, dissolution or winding up) 
to the Series A Preferred Stock unless, prior thereto, the holders of shares 
of Series A Preferred Stock shall have received an amount equal to the accrued 
and unpaid dividends and distributions thereon, whether or not declared, to 
the date of such payment, plus an amount equal to the greater of (x) $10.00 
per whole share or (y) an aggregate amount per share equal to the Formula 
Number then in effect times the aggregate amount to be distributed per share 
to holders of Common Stock or (2) to the holders of stock ranking on a parity 
(either as to dividends or upon liquidation, dissolution or winding up) with 
the Series A Preferred Stock, except distributions made ratably on the Series 
A Preferred Stock and all other such parity stock in proportion to the total 
amounts to which the holders of all such shares are entitled upon such 
liquidation, dissolution or winding up.

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

     SECTION 7.  No Redemption; No Sinking Fund. (a) The shares of Series A 
Preferred Stock shall not be subject to redemption by the Corporation or at 
the option of any holder of Series A Preferred Stock; provided, however, that 
the Corporation may purchase or otherwise acquire outstanding shares of Series 
A Preferred Stock in the open market or by offer to any holder or holders of 
shares of Series A Preferred Stock.

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

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

     SECTION 9.  Fractional Shares.  The Series A Preferred Stock shall be 
issuable upon exercise of the Rights issued pursuant to the Rights Agreement 
in whole shares or in any fraction 

                                      -5-
<PAGE>
 
of a share that is one one-hundredth (1/100th) of a share or any integral
multiple of such fraction which shall entitle the holder, in proportion to such
holder's fractional shares, to receive dividends, exercise voting rights,
participate in distributions and to have the benefit of all other rights of
holders of Series A Preferred Stock. In lieu of fractional shares, the
Corporation, prior to the first issuance of a share or a fraction of a share of
Series A Preferred Stock, may elect (1) to make a cash payment as provided in
the Rights Agreement for fractions of a share other than one one-hundredth
(1/100th) of a share or any integral multiple thereof or (2) to issue depository
receipts evidencing such authorized fraction of a share of Series A Preferred
Stock pursuant to an appropriate agreement between the Corporation and a
depository selected by the Corporation; provided that such agreement shall
provide that the holders of such depository receipts shall have all the rights,
privileges and preferences to which they are entitled as holders of the Series A
Preferred Stock.

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

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

                                      -6-
<PAGE>
 
     IN WITNESS WHEREOF, the Corporation has caused this Certificate to be 
duly executed in its corporate name on this 14th day of November, 1997.

                                        LIGHTBRIDGE, INC.



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


Attest:


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

                                      -7-
<PAGE>
 
                                                                       EXHIBIT B

                          [Form of Right Certificate]


Certificate No. [R]-
                    ______ Rights


              NOT EXERCISABLE AFTER NOVEMBER 14, 2007, OR EARLIER IF
              REDEEMED BY THE COMPANY. THE RIGHTS ARE SUBJECT TO
              REDEMPTION, AT THE OPTION OF THE COMPANY, AT $.01 PER RIGHT,
              ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT. RIGHTS
              BENEFICIALLY OWNED BY AN ACQUIRING PERSON OR AN AFFILIATE OR
              ASSOCIATE OF AN ACQUIRING PERSON (AS SUCH TERMS ARE DEFINED
              IN THE RIGHTS AGREEMENT) AND BY ANY SUBSEQUENT HOLDER OF SUCH
              RIGHTS ARE NULL AND VOID AND NONTRANSFERABLE.


                               Right Certificate

                               LIGHTBRIDGE, 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 November 14, 1997 (the "Rights 
Agreement"), between Lightbridge, Inc., a Delaware corporation (the 
"Company"), and American Stock Transfer and Trust Company, a limited power 
banking trust company licensed by the New York State Banking Authority, as 
Rights Agent (the "Rights Agent"), unless the Rights evidenced hereby shall 
have been previously redeemed by the Company, to purchase from the Company at 
any time after the Distribution Date (as defined in the Rights Agreement) and 
prior to 5:00 p.m., Boston time, on the 10th anniversary of the date of the 
Rights Agreement (the "Expiration Date"), at the office of the Rights Agent, 
or its successors as Rights Agent, in Brooklyn, New York, one one-hundredth 
(1/100th) of a fully paid, nonassessable share of Series A Participating 
Cumulative Preferred Stock, par value $.01 per share, of the Company (the 
"Preferred Shares"), at a purchase price per one one-hundredth (1/100th) of a 
share equal to $75.00 (the "Purchase Price") payable in cash, upon 
presentation and surrender of this Right Certificate with the Form of Election 
to Purchase duly executed.

     The Purchase Price and the number and kind of shares which may be 
purchased upon exercise of each Right evidenced by this Right Certificate, as 
set forth above, are the Purchase Price and the number and kind of shares 
which may be so purchased as of November 14, 1997.  As provided in the Rights 
Agreement, the Purchase Price and the number and kind of shares which may be 
purchased upon the exercise of each Right evidenced by this Right Certificate 
are subject to modification and adjustment upon the happening of certain 
events.

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

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

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

     Subject to the provisions of the Rights Agreement, the Rights evidenced 
by this Right Certificate may be redeemed by the Company at its option at a 
redemption price (in cash or shares of Common Stock or other securities of the 
Company deemed by the Board of Directors to be at least equivalent in value) 
of $.01 per Right (which amount shall be subject to adjustment as provided in 
the Rights Agreement) at any time prior to the earlier of (i) such time as a 
Person becomes an Acquiring Person and (ii) the Expiration Date.

     The Company may, but shall not be required to, issue fractions of 
Preferred Shares or distribute certificates which evidence fractions of 
Preferred Shares upon the exercise of any Right or Rights evidenced hereby.  
In lieu of issuing fractional shares, the Company may elect to make a cash 
payment as provided in the Rights Agreement for fractions of a share other 
than one one-hundredth (1/100th) of a share or any integral multiple thereof 
or to issue certificates or utilize a depository arrangement as provided in 
the terms of the Rights Agreement and the Preferred Shares.

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

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

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


Dated as of:

                                   LIGHTBRIDGE, INC.


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



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

Countersigned:

American Stock Transfer and Trust Company
as Rights Agent,

By:
   --------------------------------- 
    Authorized Signatory

                                      -3-
<PAGE>
 
                    [On Reverse Side of Right Certificate]


                         FORM OF ELECTION TO PURCHASE

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

To the Rights Agent:

     The undersigned hereby irrevocably elects to exercise ____________ Rights 

represented by this Right Certificate to purchase the Preferred Shares (or 

other shares) issuable upon the exercise of such Rights and requests that 

certificates for such shares be issued in the name of:



Please insert social security
or other identifying number

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


     If such number of Rights shall not be all the Rights evidenced by this 

Right Certificate, a new Right 

                                      -4-
<PAGE>
 
Certificate for the balance remaining of such Rights shall be registered in 

the name of and delivered to:


Please insert social security
or other identifying number


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


Dated:           
      ------------------, ----


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


Signature Guaranteed:


                                    NOTICE

     The signature on the foregoing Form of Election to Purchase must 

correspond to the name as written upon the face of this Right Certificate in 

every particular, without alteration or enlargement or any change whatsoever.

                                      -5-



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