Document:

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EXHIBIT 4.3

AMENDMENT TO RIGHTS AGREEMENT

	1.	 	General Background. In accordance with Section 21 of the Rights Agreement between Fleet
National Bank (the “Rights Agent”) and Kirby Corporation (“Kirby”) dated July 18, 2000 (the
“Agreement”), the Rights Agent and Kirby Corporation desire to amend the Agreement to appoint
EquiServe Trust Company, N.A.
	 
	2.	 	Effectiveness. This Amendment shall be effective as of April 30, 2002 (the “Amendment”) and
all defined terms and definitions in the Agreement shall be the same in the Amendment except
as specifically revised by the Amendment.
	 
	3.	 	Revision. The sixth sentence of Section 21 of the Agreement is hereby amended to read as
follows:
	 
	 	 	“Any successor Rights Agent, whether appointed by the Company or by such a court, shall be
(a) a corporation or trust company organized and doing business under the laws of the
United States or of the Commonwealth of Massachusetts or the States of New York or Texas
(or of any other state of the United States so long as such corporation or trust company
is authorized to conduct a stock transfer or corporate trust business in the Commonwealth
of Massachusetts or the States of New York or Texas), in good standing, which is
authorized under such laws to exercise corporate trust or stock transfer powers and is
subject to supervision or examination by federal or state authority and which has at the
time of its appointment as Rights Agent a combined capital and surplus of at least
$50,000,000 or (b) an affiliate of a corporation or trust company described in clause (a)
of this sentence.”
	 
	4.	 	Except as amended hereby, the Agreement and all schedules or exhibits thereto shall remain in
full force and effect.

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be executed in their names and
on their behalf by and through their duly authorized officers, as of this 30th day of
April, 2002.

	 	 	 
	Kirby Corporation

	 	Fleet National Bank
	 
	 	 
	/s/ g. stephen holcomb

	 	/s/ Carol Mulvey-Euri
	 

By: G. Stephen Holcomb

	 	 
 By:
Carol Mulvey-Euri
	Title: Vice President-Investor Relations

	 	Title: Managing Director
	 
	 	 
	 

	 	EquiServe Trust Company, N.A.
	 
	 	 
	 

	 	/s/ Carol Mulvey-Euri
	 

	 	 
	 

	 	By: Carol Mulvey-Euri
	 

	 	Title: Managing Directorexv10w13

 

EXHIBIT 10.13

KIRBY CORPORATION

2002 Stock and Incentive Plan

ARTICLE 1. GENERAL

     Section 1.1. Purpose. The purpose of this Plan is to advance the interests of Kirby
Corporation, a Nevada corporation (the “Company”), by providing an additional incentive to attract
and retain qualified and competent employees for the Company and its subsidiaries, upon whose
efforts and judgment the success of the Company is largely dependent, through the award of (i)
Options to purchase shares of Common Stock (which Options may be Incentive Stock Options or
Nonincentive Stock Options); (ii) shares of Restricted Stock; and (iii) Performance Awards.

     Section 1.2. Definitions. As used herein, the following terms shall have the meaning
indicated:

     (a) “Award” means a grant under this Plan in the form of Options, Restricted Stock,
Performance Awards or any combination of the foregoing.

     (b) “Board” means the Board of Directors of the Company.

     (c) “Change in Control” means the occurrence of any of the following events:

     (i) Any “person” (as such term is used in Sections 13(d) and 14(d)(2) of the
Securities Exchange Act of 1934, as amended) becomes the beneficial owner, directly
or indirectly, of voting securities representing thirty percent (30%) or more of the
combined voting power of the Company’s then outstanding voting securities;

     (ii) The Board ceases to consist of a majority of Continuing Directors, with
the term “Continuing Director” meaning a Director who (A) is a Director on the
effective date of the Plan or (B) is nominated or appointed to serve as a Director
by a majority of the then Continuing Directors;

     (iii) The stockholders of the Company approve (A) any consolidation or merger
of the Company or any Subsidiary that results in the holders of the Company’s voting
securities immediately prior to the consolidation or merger having (directly or
indirectly) less than a majority ownership interest in the outstanding voting
securities of the surviving entity immediately after the consolidation or merger,
(B) any sale, lease, exchange or other transfer (in one transaction or a series of
related transactions) of all or substantially all of the assets of the Company or
(C) any plan or proposal for the liquidation or dissolution of the Company;

 

 

     (iv) The stockholders of the Company accept a share exchange, with the result
that stockholders of the Company immediately before such share exchange do not own,
immediately following such share exchange, at least a majority of the voting
securities of the entity resulting from such share exchange in substantially the
same proportion as their ownership of the voting securities outstanding immediately
before such share exchange; or

     (v) Any tender or exchange offer is made to acquire thirty percent (30%) or
more of the voting securities of the Company, other than an offer made by the
Company, and shares are acquired pursuant to that offer.

For purposes of this definition, the term “voting securities” means equity securities, or
securities that are convertible or exchangeable into equity securities, that have the right to
vote generally in the election of Directors.

     (d) “Code” means the Internal Revenue Code of 1986, as amended.

     (e) “Committee” means the Compensation Committee, if any, appointed by the Board.

     (f) “Date of Grant” means the date on which the Committee takes formal action to grant
an Award to an Eligible Person or such later date as may be specified by the Committee when
approving the Award.

     (g) “Director” means a member of the Board.

     (h) “Disability” means mental or physical disability as determined by a medical doctor
satisfactory to the Committee.

     (i) “Eligible Person” means an employee of the Company or a Subsidiary.

     (j) “Fair Market Value” of a Share means the closing price on the New York Stock
Exchange on the day of reference. If the Shares are not listed for trading on the New York
Stock Exchange, the Fair Market Value on the date of reference shall be determined by any
fair and reasonable means prescribed by the Committee.

     (k) “Incentive Stock Option” means an option that is an incentive stock option as
defined in Section 422 of the Code.

     (l) “Nonincentive Stock Option” means an option that is not an Incentive Stock Option.

     (m) “Option” means any option granted under this Plan.

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     (n) “Optionee” means a person to whom a stock option is granted under this Plan or any
successor to the rights of such person under this Plan by reason of the death of such
person.

     (o) “Participant” means a person to whom an Award is granted under the Plan.

     (p) “Performance Award” means an Award granted pursuant to Article IV.

     (q) “Performance Objectives” means the objectives established by the Committee pursuant
to Section 4.1(b).

     (r) “Performance Period” means the period over which the performance of a holder of a
Performance Award is measured.

     (s) “Plan” means this Kirby Corporation 2002 Stock and Incentive Plan for Kirby
Corporation.

     (u) “Restricted Stock” means Shares granted under this Plan that are subject to
restrictions imposed by the Committee pursuant to Article III.

     (v) “Restricted Stock Award” means an award of Restricted Stock under this Plan.

     (w) “Section 162(m) Participant” means each Participant who is, on the last day of the
applicable fiscal year of the Company, either (i) the chief executive officer of the Company
or (ii) one of the four most highly compensated officers of the Company other than the chief
executive officer.

     (x) “Share” means a share of the common stock, par value ten cents ($0.10) per share,
of the Company.

     (y) “Subsidiary” means any corporation (other than the Company) in any unbroken chain
of corporations beginning with the Company if each of the corporations other than the last
corporation in the unbroken chain owns stock possessing 50% or more of the total combined
voting power of all classes of stock in one of the other corporations in the chain.

     Section 1.3. Total Shares and Limitations.

     (a) The maximum number of Shares that may be issued under the Plan shall be Two Million
(2,000,000) Shares, which may be from Shares held in the Company’s treasury or from
authorized and unissued Shares. If any Award granted under the Plan shall terminate, expire
or be cancelled or surrendered as to any Shares, or the Award is paid in cash in lieu of
Shares, such Award shall not count against the above limit and shall again become available
for grants under the Plan. Shares equal in number to the Shares surrendered in payment of
the option price of an Option and Shares that are

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withheld in order to satisfy federal, state or local tax liability, shall not count
against the above limits.

     (b) No Participant may be granted Options covering more than 500,000 Shares during the
term of the Plan.

     (c) The maximum number of Shares that may be issued to any Participant pursuant to any
Performance Award during the term of the Plan shall be 240,000.

     (d) The maximum amount of cash that may be paid to any Participant pursuant to any
Performance Award during any calendar year shall be $1,200,000.

     Section 1.4. Awards Under the Plan.

     (a) Only Eligible Persons may receive awards under the Plan. Awards to Eligible
Persons may be in the form of (i) Options; (ii) shares of Restricted Stock; (iii)
Performance Awards; or (iv) any combination of the foregoing. No Award shall confer on any
person any right to continue as an employee of the Company or any Subsidiary.

     (b) Each Award shall be evidenced by an agreement containing any terms deemed necessary
or desirable by the Committee that are not inconsistent with the Plan or applicable law.

ARTICLE II. STOCK OPTIONS

     Section 2.1. Grant of Options. The Committee may from time to time grant Options to Eligible
Persons. Options may be Incentive Stock Options or Nonincentive Stock Options as designated by the
Committee on the Date of Grant. If no such designation is made by the Committee for an Option, the
Option shall be a Nonincentive Stock Option. The aggregate Fair Market Value (determined as of the
Date of Grant) of the Shares with respect to which Incentive Stock Options are exercisable for the
first time by an Optionee during any calendar year under the Plan and all such plans of the Company
and any parent or subsidiary of the Company (as defined in Section 424 of the Code) shall not
exceed $100,000.

     Section 2.2. Exercise Price. The exercise price per Share for any Option shall be determined
by the Committee, but shall not be less than the Fair Market Value on the Date of Grant and shall
not be less than 110% of the Fair Market Value on the Date of Grant for any Incentive Stock Option
if the Optionee is a person who owns directly or indirectly (within the meaning of Section
422(b)(6) of the Code) stock possessing more than 10% of the total combined voting power of all
classes of stock of the Company.

     Section 2.3. Term of Option. The term of an Option shall be determined by the
Committee, provided that, in the case of an Incentive Stock Option, if the grant is to a person who
owns directly or indirectly (within the meaning of Section 422(b)(6) of the Code) stock possessing
more than 10% of the total combined voting power of all classes of stock of the Company, the term
of the Option shall not exceed five years from the Date of Grant.

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Notwithstanding any other provision of this Plan, no Option shall be exercised after the
expiration of its term.

     Section 2.4. Vesting. Options shall be exercisable at such times and subject to such terms
and conditions as the Committee shall specify in the option agreement. Unless the option agreement
specifies otherwise, the Committee shall have discretion at any time to accelerate such times and
otherwise waive or amend any conditions in respect of all or any portion of any Options.
Notwithstanding the other provisions of this Section 2.4 and unless otherwise provided in the
option agreement, upon the occurrence of a Change in Control, all Options outstanding at the time
of the Change in Control shall become immediately exercisable.

     Section 2.5. Termination of Options.

     (a) Except as otherwise provided in the option agreement, the portion of an Option that
is exercisable shall automatically and without notice terminate upon the earliest to occur
of the following:

     (i) thirty (30) days after the date on which Optionee ceases to be an Employee
for any reason other than (x) death, (y) Disability or (z) termination for cause;

     (ii) one (1) year after the date on which Optionee ceases to be an Employee as
a result of a Disability;

     (iii) either (y) one (1) year after the death of Optionee or (z) six (6) months
after the death of Optionee if Optionee dies during the 30-day period described in
Section 2.5(a)(i) or the one-year period described in Section 2.5(a)(ii);

     (iv) the date on which Optionee ceases to be an Employee as a result of a
termination for cause; and

     (v) the tenth anniversary of the Date of Grant of the Option.

     (b) The portion of an Option that is not exercisable shall automatically and without
notice terminate on the date on which Optionee ceases to be an Employee for any reason.

     (c) The Committee shall have discretion at any time to extend the term of any
Nonincentive Stock Option to any date that is not later than the date described in Section
2.5(a)(v).

     Section 2.6. Exercise of Options. An Option may be exercised in whole or in part to the
extent exercisable in accordance with Section 2.4 and the option agreement. An Option shall be
deemed exercised when (i) the Company has received written notice of such exercise in accordance
with the terms of the Option and (ii) full payment of the aggregate exercise price of the Shares as
to which the Option is exercised has been made. Unless further limited by the

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Committee in any Option, the exercise price of any Shares purchased shall be paid solely in
cash, by certified or cashier’s check, by money order, by personal check or with Shares owned by
the Optionee for at least six months, or by a combination of the foregoing. If the exercise price
is paid in whole or in part with Shares, the value of the Shares surrendered shall be their Fair
Market Value on the date received by the Company.

     Section 2.7. Corporate Transactions.

     (a) In the event of a merger, consolidation or other reorganization of the Company in which
the Company is not the surviving entity, the Board or the Committee may provide for payment in cash
or in securities of the Company or the surviving entity in lieu of and in complete satisfaction of
Options.

     (b) Except as otherwise expressly provided herein, the issuance by the Company of shares of
its capital stock of any class, or securities convertible into shares of capital stock of any
class, either in connection with direct sale or upon the exercise of rights or warrants to
subscribe therefor, or upon conversion of shares or obligations of the Company convertible into
such shares or other securities, shall not affect, and no adjustment by reason thereof shall be
made with respect to, the number of or exercise price of Shares then subject to outstanding Options
granted under the Plan.

     (c) Without limiting the generality of the foregoing, the existence of outstanding Options
granted under the Plan shall not affect in any manner the right or power of the Company to make,
authorize or consummate (i) any or all adjustments, recapitalizations, reorganizations or other
changes in the Company’s capital structure or its business; (ii) any merger or consolidation of the
Company; (iii) any issue by the Company of debt securities, or preferred or preference stock that
would rank above the Shares subject to outstanding Options; (iv) the dissolution or liquidation of
the Company; (v) any sale, transfer or assignment of all or any part of the assets or business of
the Company; or (vi) any other corporate act or proceeding, whether of a similar character or
otherwise.

     Section 2.8. Issuance of Shares. No person shall be, or have any of the rights or privileges
of, a stockholder of the Company with respect to any of the Shares subject to any Option unless and
until certificates representing such Shares shall have been issued and delivered to such person.

ARTICLE III. RESTRICTED STOCK

     Section 3.1. Grant of Restricted Stock Awards. The Committee may from time to time grant
Restricted Stock Awards to Eligible Persons.

     Section 3.2. Terms and Conditions of Restricted Stock Awards. Each Restricted Stock Award
shall specify the number of shares of Restricted Stock awarded, the price, if any, to be paid by
the Participant receiving the Restricted Stock Award, the date or dates on which the Restricted
Stock will vest and any other terms and conditions that the Committee may determine. The vesting
and number of shares of Restricted Stock may be conditioned upon the completion of a specified
period of service with the Company or its Subsidiaries or upon the attainment of

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any performance goals established by the Committee, including without limitation goals related
to the performance of the Company or any Subsidiary, division, department or other unit of the
Company, the performance of the Company’s common stock or other securities, the performance of the
recipient of the Restricted Stock Award or any combination of the foregoing.

     Section 3.3. Restrictions on Transfer. Unless otherwise provided in the grant
relating to a Restricted Stock Award, stock certificates representing the Restricted Stock granted
to a Participant shall be registered in the Participant’s name or, at the option of the Committee,
not issued until such time as the Restricted Stock shall become vested or as otherwise determined
by the Committee. If certificates are issued prior to the shares of Restricted Stock becoming
vested, such certificates shall either be held by the Company on behalf of the Participant, or
delivered to the Participant bearing a legend to restrict transfer of the certificate until the
Restricted Stock has vested, as determined by the Committee. The Committee shall determine whether
the Participant shall have the right to vote and/or receive dividends on the Restricted Stock
before it has vested. Except as may otherwise be expressly permitted by the Committee, no share of
Restricted Stock may be sold, transferred, assigned or pledged by the Participant until such share
has vested in accordance with the terms of the Restricted Stock Award. Unless the grant of a
Restricted Stock Award specifies otherwise, in the event that a Participant ceases to be an
Employee before all the Participant’s Restricted Stock has vested, or in the event other conditions
to the vesting of Restricted Stock have not been satisfied prior to any deadline for the
satisfaction of such conditions set forth in the award agreement, the shares of Restricted Stock
that have not vested shall be forfeited and any purchase price paid by the Participant for the
forfeited Shares shall be returned to the Participant. At the time Restricted Stock vests (and, if
the Participant has been issued legended certificates for Restricted Stock, upon the return of such
certificates to the Company), a certificate for such vested shares shall be delivered to the
Participant (or the beneficiary designated by the Participant in the event of death), free of all
restrictions.

     Section 3.4. Accelerated Vesting. Notwithstanding the vesting conditions set forth
in a Restricted Stock Award, unless the Restricted Stock Award grant or other agreement with the
Participant specifies otherwise:

     (a) the Committee may in its discretion at any time accelerate the vesting of
Restricted Stock or otherwise waive or amend any conditions of a grant of a Restricted Stock
Award, and

     (b) all shares of Restricted Stock shall vest upon a Change in Control of the Company.

     Section 3.5. Section 83(b) Election. If a Participant receives Restricted Stock that
is subject to a “substantial risk of forfeiture,” such Participant may elect under Section 83(b) of
the Code to include in his or her gross income, for the taxable year in which the Restricted Stock
is received, the excess of the Fair Market Value of such Restricted Stock on the Date of Grant
(determined without regard to any restriction other than one which by its terms will never lapse),
over the amount paid for the Restricted Stock. If the Participant makes the Section 83(b)
election, the Participant shall (a) make such election in a manner that is satisfactory to the
Committee, (b) provide the Company with a copy of such election, (c) agree to promptly notify the
Company if any Internal Revenue Service or state tax agent, on audit or otherwise, questions

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the validity or correctness of such election or of the amount of income reportable on account
of such election and (d) agree to such federal and state income tax withholding as the Committee
may reasonably require in its sole discretion.

ARTICLE IV. PERFORMANCE AWARDS

     Section 4.1. Terms and Conditions of Performance Awards. The Committee may from time to time
grant Awards that are intended to be “performance-based compensation,” which are payable in stock,
cash or a combination thereof, at the discretion of the Committee.

     (a) Performance Period. The Committee shall establish a Performance Period for each
Performance Award at the time such Performance Award is granted. A Performance Period may
overlap with Performance Periods relating to other Performance Awards granted hereunder to
the same Participant. The Committee shall not grant Performance Awards to Section 162(m)
Participants after the earliest to occur of (i) the 90th day after the start of
the Performance Period, (ii) the date on which 25% of the Performance Period has elapsed or
(iii) the date on which the satisfaction of the Performance Objectives becomes substantially
certain.

     (b) Performance Objectives. The Committee shall establish written performance
objectives for the Participant at the time of the grant of each Performance Award. Each
Performance Award shall be contingent upon the achievement of the Performance Objectives
established by the Committee. Performance Objectives shall be based on earnings, cash flow,
economic value added, total stockholder return, return on equity, return on capital, return
on assets, revenues, operating profit, EBITDA, net profit, earnings per share, stock price,
cost reduction goals, debt to capital ratio, financial return ratios, profit or operating
margins, working capital or other comparable objective tests selected by the Committee, or
any combination of the foregoing, for the Company on a consolidated basis or, if applicable,
for one or more Subsidiaries, divisions, departments or other units of the Company or one or
more of its Subsidiaries.

     (c) Amount; Frequency. The Committee shall determine at the time of grant of
Performance Awards the target and maximum values of Performance Awards and the date or dates
when Performance Awards are earned.

     (d) Payment. Following the end of each Performance Period, the holder of each
Performance Award will be entitled to receive payment of an amount, not exceeding the
maximum value of the Performance Award, based on the achievement of the Performance
Objectives for such Performance Period, as determined in writing by the Committee. Unless
otherwise provided in the Performance Award, if the Participant exceeds the specified
minimum level of acceptable achievement but does not attain such objectives, the Participant
shall be deemed to have partly earned the Performance Award, and shall become entitled to
receive a portion of the total award, as determined by the Committee. Unless otherwise
provided in the Performance Award, if a Performance Award is granted after the start of a
Performance Period, the Performance Award shall be reduced to reflect the portion of the
Performance Period during which the Performance Award was in effect.

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     (e) Termination of Employment. Unless otherwise provided in the Performance Award, a
Participant who receives a Performance Award and who ceases to be an Employee as a result of
death, Disability or retirement before the end of the applicable Performance Period shall be
entitled to receive, to the extent earned as a result of the full or partial achievement of
the Performance Objectives during the Performance Period, a portion of the Performance Award
that is proportional to the portion of the Performance Period during which the Participant
was employed, with payment to be made following the end of the Performance Period. Unless
otherwise provided in the Performance Award, a Participant who receives a Performance Award
who ceases to be an Employee for any reason other than death, Disability or retirement shall
not be entitled to any part of the Performance Award unless the Committee determines
otherwise.

     (f) Accelerated Vesting. Notwithstanding the vesting conditions set forth in a
Performance Award, unless the Performance Award specifies otherwise (i) the Committee may in
its discretion at any time accelerate the time at which the Performance Award is considered
to have been earned or otherwise waive or amend any conditions (including but not limited to
Performance Objectives) in respect of a Performance Award, and (ii) all Performance Awards
shall be considered earned upon a Change in Control of the Company. In addition, upon a
Change in Control of the Company, unless a Performance Award specifies otherwise, each
Participant shall receive the target Performance Award such Participant could have earned
for the proportionate part of the Performance Period prior to the Change in Control, and
shall retain the right to earn any additional portion of his or her Performance Award if
such Participant remains in the Company’s employ through the end of the Performance Period.

     (g) Stockholder Rights. The holder of a Performance Award shall, as such, have none of
the rights of a stockholder.

ARTICLE V. ADDITIONAL PROVISIONS

     Section 5.1. Administration of the Plan. The Plan shall be administered by the Committee.
The Committee shall have the authority to interpret the provisions of the Plan, to adopt such rules
and regulations for carrying out the Plan as it may deem advisable, to decide conclusively all
questions arising with respect to the Plan, to establish performance criteria in respect of Awards
under the Plan, to determine whether Plan requirements have been met for any Participant in the
Plan and to make all other determinations and take all other actions necessary or desirable for the
administration of the Plan. All decisions and acts of the Committee shall be final and binding
upon all affected Participants. If there is no Committee, the Board shall administer the Plan and
in such case all references to the Committee shall be deemed to be references to the Board.

     Section 5.2 Adjustments for Changes in Capitalization. In the event of any stock dividends,
stock splits, recapitalizations, combinations, exchanges of shares, mergers, consolidations,
liquidations, split-ups, split-offs, spin-offs or other similar changes in capitalization, or any
distributions to stockholders, including a rights offering, other than regular cash dividends,
changes in the outstanding stock of the Company by reason of any increase or

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decrease in the number of issued Shares resulting from a split-up or consolidation of Shares or any
similar capital adjustment or the payment of any stock dividend, any Share repurchase at a price in
excess of the market price of the Shares at the time such repurchase is announced or other increase
or decrease in the number of the Shares, the Committee shall make appropriate adjustment in the
number and kind of shares authorized by the Plan (including the numbers of Shares specified in
Section 1.3(b) and (c)), in the number, price or kind of shares covered by the Awards and in any
outstanding Awards under the Plan. In the event of any adjustment in the number of Shares covered
by any Award, any fractional Shares resulting from such adjustment shall be disregarded and each
such Award shall cover only the number of full Shares resulting from such adjustment.

     Section 5.3. Amendment.

     (a) The Board may amend or modify the Plan in any respect at any time. Such action
shall not impair any of the rights of any Participant with respect to any Award outstanding
on the date of the amendment or modification without the Participant’s written consent.

     (b) The Committee shall have the authority to amend any Award to include any provision
which, at the time of such amendment, is authorized under the terms of the Plan; however, no
outstanding Award may be revoked or altered in a manner unfavorable to the Participant
without the written consent of the Participant.

     Section 5.4. Transferability of Awards. An Award shall not be transferable by the Participant
otherwise than by will or the laws of descent and distribution. So long as a Participant lives,
only such Participant or his or her guardian or legal representative shall have the right to
exercise such Award.

     Section 5.5. Beneficiary. A Participant may file with the Company a written designation of
beneficiary, on such form as may be prescribed by the Committee, to receive any Shares, Awards or
payments that become deliverable to the Participant pursuant to the Plan after the Participant’s
death. A Participant may, from time to time, amend or revoke a designation of beneficiary. If no
designated beneficiary survives the Participant, the executor or administrator of the Participant’s
estate shall be deemed to be the Participant’s beneficiary.

     Section 5.6. Non-uniform Determinations. Determinations by the Committee under the Plan
(including, without limitation, determinations of the Eligible Persons to receive Awards, the form,
amount and timing of Awards, the terms and provisions of Awards and the agreements evidencing
Awards and provisions with respect to termination of employment) need not be uniform and may be
made by the Committee selectively among persons who receive, or are eligible to receive, Awards
under the Plan, whether or not such persons are similarly situated.

     Section 5.7. Duration and Termination. The Plan shall be of unlimited duration,
provided that no Incentive Stock Option shall be granted under the Plan on or after the tenth
anniversary of the effective date of the Plan. The Board may suspend, discontinue or terminate the
Plan at any time. Such action shall not impair any of the rights of any holder of any Award

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outstanding on the date of the Plan’s suspension, discontinuance or termination without the
holder’s written consent.

     Section 5.8. Withholding. Prior to the issuance of any Shares under the Plan,
arrangements satisfactory to the Committee in its sole discretion shall have been made for the
Participant’s payment to the Company of the amount, if any, that the Committee determines to be
necessary for the Company or Subsidiary employing the Participant to withhold in accordance with
applicable federal or state income tax withholding requirements. When payments under the Plan are
made in cash, such payments shall be net of an amount sufficient to satisfy such withholding
requirements.

     Section 5.9. Agreements and Undertakings. As a condition of any issuance or transfer
of a certificate for Shares, the Committee may obtain such agreements or undertakings, if any, as
it may deem necessary or advisable to assure compliance with any provision of the Plan, any
agreement or any law or regulation including, but not limited to, the following:

     (a) a representation, warranty or agreement by the Participant to the Company that the
Participant is acquiring the Shares for investment and not with a view to, or for sale in
connection with, the distribution of any such Shares; and

     (b) a representation, warranty or agreement to be bound by any legends that are, in the
opinion of the Committee, necessary or appropriate to comply with the provisions of any
securities law deemed by the Committee to be applicable to the issuance of the Shares and
are endorsed on the Share certificates.

     Section 5.10. Governing Law. The Plan shall be governed by the laws of the State of
Texas except to the extent that federal law or Nevada corporate law is controlling.

     Section 5.11. Effective Date. The Plan shall be effective as of February 28, 2002,
the date of its adoption by the Board, subject to approval by a majority of the Company’s
stockholders represented in person or by proxy at a duly convened meeting on or before the first
anniversary of the effective date of the Plan. If the Plan is not so approved by the first
anniversary of the effective date of the Plan or, if earlier, the date of a meeting of stockholders
of the Company at which the Plan is proposed for approval but is not approved, the Plan and all
Awards shall automatically terminate and be null and void ab initio. Notwithstanding any provision
of the Plan or any Award, no Award shall be exercisable or shall vest prior to such stockholder
approval.

ADOPTED BY THE BOARD: February 28, 2002

AS AMENDED BY THE BOARD ON January 22, 2007 (with numbers of shares revised to reflect the
2-for-1 stock split on May 31, 2006).

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