AURORA BIOSCIENCES CORP
S-8, 1999-05-21
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>

      As filed with the Securities and Exchange Commission on May 21, 1999
                             Registration No. 333-
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

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

       DELAWARE                                          33-0669859
(State of Incorporation)                    (I.R.S. Employer Identification No.

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

                              11010 TORREYANA ROAD
                          SAN DIEGO, CALIFORNIA 92121
                                (619) 404-6600
                    (Address of principal executive offices)

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

                                 1996 STOCK PLAN

                          EMPLOYEE STOCK PURCHASE PLAN
                            (Full title of the plans)

                                 JOHN POSHKOWSKY
                            SENIOR DIRECTOR, FINANCE
                         AURORA BIOSCIENCES CORPORATION
                              11010 TORREYANA ROAD
                           SAN DIEGO, CALIFORNIA 92121
                                 (619) 404-6600
 (Name, address, including zip code, and telephone number, including area code,
                              of agent for service)

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

                                   COPIES TO:
                              THOMAS A. COLL, ESQ.
                               COOLEY GODWARD LLP
                        4365 EXECUTIVE DRIVE, SUITE 1100
                           SAN DIEGO, CALIFORNIA 92121
                                 (619) 550-6000

                               ------------------
<PAGE>

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------------
                                                        PROPOSED MAXIMUM         PROPOSED MAXIMUM
   TITLE OF SECURITIES                                      OFFERING                 AGGREGATE                AMOUNT OF
     TO BE REGISTERED       AMOUNT TO BE REGISTERED      PRICE PER SHARE          OFFERING PRICE          REGISTRATION FEE
- -------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>                        <C>                       <C>                     <C>
 Stock Options and Common
 Stock (par value $.001)      2,000,000 shares(1)      ($4.938-$8.875)(2)        $12,054,561.59(2)            $3,351.17
- -------------------------------------------------------------------------------------------------------------------------------
 Stock Options and Common
 Stock (par value $.001)      2,000,000 shares(3)           $6.125(4)             $12,250,000(4)              $3,405.50
- -------------------------------------------------------------------------------------------------------------------------------
 Stock Options and Common
 Stock (par value $.001)       300,000 shares(5)            $6.125(6)              $1,837,500(6)               $510.83
- -------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1)  Consists of shares of Common Stock which are issuable pursuant to awards
     under the Registrant's 1996 Stock Plan, as amended on May 28, 1998 (the
     "1996 Plan, as amended on May 28, 1998")

(2)  Estimated solely for the purpose of calculating the amount of the
     registration fee pursuant to Rule 457(c) and (h) of the Securities Act of
     1953, as amended (the "Securities Act"). The price per share and aggregate
     offering price are based upon (a) the actual exercise price for shares
     subject to outstanding stock options previously granted under the 1996
     Plan, as amended on May 28, 1998 and (b) for shares issuable under the 1996
     Plan, as amended on May 28, 1998, calculated on the basis of the average of
     the high and low prices of Registrant's Common Stock on May 18, 1999 as
     reported on the Nasdaq National Market. The chart below shows the
     calculation of the registration fee for the increase in shares pursuant to
     the 1996 Plan, as amended on May 28, 1998.

(3)  Consists of shares of Common Stock which are issuable pursuant to awards
     under the Registrant's 1996 Stock Plan, amended on May 4, 1999.

(4)  Estimated solely for the purpose of calculating the amount of the
     registration fee pursuant to Rule 457(c) and (h) of the Securities Act. The
     price per share and aggregate offering price are calculated based upon the
     average of the high and low prices of Registrant's Common Stock on May 18,
     1999 as reported on the Nasdaq National Market.

(5)  Consists of shares of Common Stock which are issuable pursuant to awards
     under the Registrant's Employee Stock Purchase Plan, as amended as of May
     4, 1999.

(6)  Estimated solely for the purpose of calculating the amount of the
     registration fee pursuant to Rule 457(c) and (h) of the Securities Act. The
     price per share and aggregate offering price are calculated based upon the
     average of the high and low prices of Registrant's Common Stock on May 18,
     1999 as reported on the Nasdaq National Market.

<TABLE>
<CAPTION>
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
         TYPE OF SHARES                  NUMBER OF SHARES           OFFERING PRICE/SHARE ($)      AGGREGATE OFFERING PRICE ($)
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
<S>                                <C>                           <C>                             <C>
Common Stock Issuable Pursuant
to Outstanding Options under the
1996 Plan, as amended on May 28,
1998                                             561,488                         5.25                           2,947,812.00
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                  14,000                         5.00                              70,000.00
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                  18,000                         4.938                             18,004.94
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                  10,000                         6.50                              65,000.00
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                 350,000                         6.00                           2,100,000.00
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                 213,411                         6.438                          1,373,940.02
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                  48,500                         6.375                            309,187.50
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                  43,600                         8.875                            386,950.00
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                  33,000                         8.375                            276,375.00
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                   9,500                         7.938                             75,411.00
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                   1,000                         6.625                              6,625.00
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                  86,500                         7.75                             670,375.00
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
                                                  10,000                         7.375                             73,750.00
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------

- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
Common Stock issuable under the
1996 Plan, as amended on May 28,
1998                                             601,001                         6.125                          3,681,131.13
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------

<PAGE>

- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
Total                                          2,000,000                                                       12,054,561.59
- ---------------------------------- ----------------------------- ------------------------------- ------------------------------
</TABLE>
























                                       2
<PAGE>

                    INCORPORATION BY REFERENCE OF CONTENTS OF
         REGISTRATION STATEMENT ON FORM S-8 (REGISTRATION NO. 333-30039)

     The contents of Registration Statement on Form S-8 (Registration No.
333-30039) filed with the Securities and Exchange Commission on June 25, 1997
are incorporated by reference herein.

                                    EXHIBITS

<TABLE>
<CAPTION>
EXHIBIT
NUMBER
<S>           <C>
     5        Opinion of Cooley Godward LLP
    23.1      Consent of Ernst & Young LLP, Independant Auditors
    23.2      Consent of Cooley Godward LLP is contained in Exhibit 5 to this
              Registration Statement
    24        Power of Attorney is contained on the signature pages.
    99.1      1996 Stock Plan, as amended as of May 4, 1999.
    99.2      Employee Stock Purchase Plan, as amended as of May 4, 1999.
</TABLE>

<PAGE>

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant certifies that it has reasonable grounds to believe that it
meets all of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of San Diego, State of California, on
May 21, 1999.

                                   AURORA BIOSCIENCES CORPORATION

                                   By: /s/ Timothy J. Rink
                                       ----------------------------------------
                                         Timothy J. Rink
                                         Chief Executive Officer and President

                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Timothy J. Rink and John D. Mendlein,
and each or any one of them, his true and lawful attorney-in-fact and agent,
with full power of substitution and resubstitution, for him and in his name,
place and stead, in any and all capacities, to sign any and all amendments
(including post-effective amendments) to this Registration Statement, and to
file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary to be
done in connection therewith, as fully to all intents and purposes as he
might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or any of them, or their or his substitutes or
substitute, may lawfully do or cause to be done by virtue hereof.

<PAGE>

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
                  SIGNATURE                                             TITLE                               DATE
<S>                                                          <C>                                        <C>
/s/  Timothy J. Rink                                         Chairman of the Board, President           May 21, 1999
- --------------------------------------------                 and Chief Executive Officer
TIMOTHY J. RINK, M.A., M.D., SC.D.

/s/  James C. Blair                                          Director                                   May 21, 1999
- --------------------------------------------
JAMES C. BLAIR, PH.D.

/s/ Kevin J. Kinsella                                        Director                                   May 21, 1999
- --------------------------------------------
KEVIN J. KINSELLA

/s/ Hugh Y. Rienhoff, Jr.                                    Director                                   May 21, 1999
- --------------------------------------------
HUGH Y. RIENHOFF, JR., M.D.

/s/ Robert Stryer                                            Director                                   May 21, 1999
- --------------------------------------------
ROBERT STRYER, M.D

/s/ Roy A. Whitfield                                         Director                                   May 21, 1999
- --------------------------------------------
ROY A. WHITFIELD

/s/ Timothy J. Wollaeger                                     Director                                   May 21, 1999
- --------------------------------------------
TIMOTHY J. WOLLAEGER
</TABLE>

<PAGE>

                                  EXHIBIT INDEX

<TABLE>
<CAPTION>
   EXHIBIT
    NUMBER                                       DESCRIPTION
<S>              <C>
      5          Opinion of Cooley Godward LLP
     23.1        Consent of Ernst & Young LLP, Independant Auditors
     23.2        Consent of Cooley Godward LLP is contained in Exhibit 5 to this
                 Registration Statement
     24          Power of Attorney is contained on the signature pages.
     99.1        1996 Stock Plan, as amended as of May 4, 1999.
     99.2        Employee Stock Purchase Plan, as amended as of May 4, 1999.
</TABLE>


<PAGE>

                                                                      EXHIBIT 5

May 21, 1999

AURORA BIOSCIENCES CORPORATION
11149 North Torrey Pines Road
La Jolla, California 92037

Ladies and Gentlemen:

You have requested our opinion with respect to certain matters in connection
with the filing by Aurora Biosciences Corporation (the "Company") of a
Registration Statement on Form S-8 (the "Registration Statement") with the
Securities and Exchange Commission covering the offering of up to (i)
2,000,000 shares of the Company's Common Stock, $.001 par value, pursuant to
its 1996 Stock Plan (the "1996 Plan"), as amended as of May 28, 1998, (ii)
2,000,000 shares of the Company's Common Stock, $.001 par value, pursuant to
the 1996 Stock Plan, as amended as of May 4, 1999 and (iii) 300,000 shares of
the Company's Common Stock, $.001 par value pursuant to its Employee Stock
Purchase Plan (the "Purchase Plan").

In connection with this opinion, we have examined the Registration Statement
and related Prospectus, your Certificate of Incorporation and By-laws, as
amended, and such other documents, records, certificates, memoranda and other
instruments as we deem necessary as a basis for this opinion. We have assumed
the genuineness and authenticity of all documents submitted to us as
originals, the conformity to originals of all documents submitted to us as
copies thereof, and the due execution and delivery of all documents where due
execution and delivery are a prerequisite to the effectiveness thereof.

On the basis of the foregoing, and in reliance thereon, we are of the opinion
that the shares, when sold and issued in accordance with the 1996 Plan, as
amended on May 28, 1998 and May 4, 1999, the Purchase Plan, the Registration
Statement and related Prospectus, will be validly issued, fully paid, and
nonassessable (except as to shares issued pursuant to certain deferred
payment arrangements, which will be fully paid and nonassessable when such
deferred payments are made in full).

We consent to the filing of this opinion as an exhibit to the Registration
Statement.

Very truly yours,

COOLEY GODWARD LLP

By: /s/ Tom A. Coll
    -------------------------
    Tom A. Coll

                                       1

<PAGE>

                                                                    EXHIBIT 23.1



               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statement
(Form S-8) pertaining to the 1996 Stock Plan and Employee Stock Purchase Plan
of Aurora Biosciences Corporation of our report dated January 29, 1999 with
respect to the financial statements of Aurora Biosciences Corporation
included in the Annual Report (Form 10-K) for the year ended December 31,
1998.

                                                      /s/ Ernst & Young LLP
                                                      -----------------------
                                                          ERNST & YOUNG LLP

San Diego, California
May 21, 1999

<PAGE>

                           AURORA BIOSCIENCES CORPORATION

                                  1996 STOCK PLAN

                               ADOPTED JANUARY 23, 1996

                   AS AMENDED AND RESTATED AS OF FEBRUARY 4, 1997

                            AS AMENDED ON APRIL 21, 1998

                             AS AMENDED ON MAY 28, 1998

                             AS AMENDED ON MAY 4, 1999

1.   PURPOSES.

     (a)  The purpose of the Plan is to provide a means by which selected
Employees and Directors of and Consultants to the Company, and its
Affiliates, may be given an opportunity to benefit from increases in value of
the stock of the Company through the granting of (i) Incentive Stock Options,
(ii) Nonstatutory Stock Options, (iii) stock bonuses, (iv) rights to purchase
restricted stock, and (v) stock appreciation rights, all as defined below.

     (b)  The Company, by means of the Plan, seeks to retain the services of
persons who are now Employees or Directors of or Consultants to the Company
or its Affiliates, to secure and retain the services of new Employees,
Directors and Consultants, and to provide incentives for such persons to
exert maximum efforts for the success of the Company and its Affiliates.

     (c)  The Company intends that the Stock Awards issued under the Plan
shall, in the discretion of the Board or any Committee to which
responsibility for administration of the Plan has been delegated pursuant to
subsection 3(c), be either (i) Options granted pursuant to Section 6 hereof,
including Incentive Stock Options and Nonstatutory Stock Options, (ii) stock
bonuses or rights to purchase restricted stock granted pursuant to Section 7
hereof, or (iii) stock appreciation rights granted pursuant to Section 8
hereof.  All Options shall be separately designated Incentive Stock Options
or Nonstatutory Stock Options at the time of grant, and in such form as
issued pursuant to Section 6, and a separate certificate or certificates will
be issued for shares purchased on exercise of each type of Option.

2.   DEFINITIONS.

     (a)  "AFFILIATE" means any parent corporation or subsidiary corporation,
whether now or hereafter existing, as those terms are defined in Sections
424(e) and (f) respectively, of the Code.

     (b)  "BOARD" means the Board of Directors of the Company.

     (c)  "CAUSE" shall mean any of the following:  (a) an intentional act
which materially injures the Company; (b) an intentional refusal or failure
to follow lawful and reasonable

<PAGE>

directions of the Board or an individual to whom a person reports (as
appropriate); (c) a willful and habitual neglect of duties; or (d) a
conviction of a felony involving moral turpitude which is reasonably likely
to inflict or has inflicted material injury on the Company.

     (d)  "CHANGE IN CONTROL" means:  (1) a dissolution, liquidation or sale
of all or substantially all of the assets of the Company; (2) a merger or
consolidation in which the Company is not the surviving corporation; (3) a
reverse merger in which the Company is the surviving corporation but the
shares of the Company's common stock outstanding immediately preceding the
merger are converted by virtue of the merger into other property, whether in
the form of securities, cash or otherwise; or (4) after the Listing Date, the
acquisition by any person, entity or group within the meaning of Section
13(d) or 14(d) of the Exchange Act or any comparable successor provisions
(excluding any employee benefit plan, or related trust, sponsored or
maintained by the Company or any Affiliate of the Company) of the beneficial
ownership (within the meaning of Rule 13d-3 promulgated under the Exchange
Act, or comparable successor rule) of securities of the Company representing
at least fifty percent (50%) of the combined voting power entitled to vote in
the election of directors.

     (e)  "CODE" means the Internal Revenue Code of 1986, as amended.

     (f)  "COMMITTEE" means a Committee appointed by the Board in accordance
with subsection 3(c) of the Plan.

     (g)  "COMPANY" means Aurora Biosciences Corporation, a Delaware
corporation.

     (h)  "CONCURRENT STOCK APPRECIATION RIGHT" or "CONCURRENT RIGHT" means a
right granted pursuant to subsection 8(b)(2) of the Plan.

     (i)  "CONSTRUCTIVELY TERMINATED" shall mean the voluntary termination of
Continuous Status as an Employee, Director or Consultant by a person within
fifteen (15) days after any of the following are undertaken without such
person's express written consent:  (a) the assignment to such person of any
duties or responsibilities which result in a material diminution or adverse
change of such person's position, status or circumstances of employment or
engagement, other than a mere change in title or reporting relationship; (b)
reduction by the Company in such person's base salary or compensation; (c)
any failure by the Company to continue in effect any benefit plan or
arrangement, including incentive plans or plans to receive securities of the
Company, in which such person is participating (hereinafter referred to as
"Benefit Plans"), or the taking of any action by the Company which would
adversely affect such person's participation in or reduce such person's
benefits under any Benefit Plans or deprive such person of any fringe benefit
then enjoyed by such person, PROVIDED, HOWEVER, that such person's
termination shall not be deemed to be Constructively Terminated if the
Company offers a range of benefit plans and programs which, taken as a whole,
are comparable to the Benefit Plans; (d) a relocation of such person or the
Company's principal business offices to a location more than fifty (50) miles
from the location at which such person performs duties, except for required
travel by such person on the Company's business to an extent substantially
consistent with such person's business travel obligations; (e) any breach by
the Company of any material agreement

<PAGE>

between such person and the Company concerning such person's employment or
engagement; or (f) any failure by the Company to obtain the assumption of any
material agreement between such person and the Company concerning such
person's employment or engagement by any successor or assign of the Company.

     (j)  "CONSULTANT" means any person, including an advisor, engaged by the
Company or an Affiliate to render consulting services and who is compensated
for such services, provided that the term "Consultant" shall not include
Directors who are paid only a director's fee by the Company or who are not
compensated by the Company for their services as Directors.

     (k)  "CONTINUOUS STATUS AS AN EMPLOYEE , DIRECTOR OR CONSULTANT" means
that the service of an individual to the Company, whether as an Employee,
Director or Consultant is not interrupted or terminated.  The Board, in its
sole discretion, may determine whether Continuous Status as an Employee,
Director or Consultant shall be considered interrupted in the case of:  (i)
any leave of absence approved by the Board, including sick leave, military
leave, or any other personal leave; or (ii) transfers between locations of
the Company or between the Company, Affiliates or their successors.

     (l)  "COVERED EMPLOYEE" means the chief executive officer and the four
(4) other highest compensated officers of the Company for whom total
compensation is required to be reported to stockholders under the Exchange
Act, as determined for purposes of Section 162(m) of the Code.

     (m)  "DIRECTOR" means a member of the Board.

     (n)  "DISABILITY" means permanent and total disability as defined in
Section 422(c)(6) of the Code.

     (o)  "EMPLOYEE" means any person, including Officers and Directors,
employed by the Company or any Affiliate of the Company.  Neither service as
a Director nor payment of a director's fee by the Company shall be sufficient
to constitute "employment" by the Company.

     (p)  "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

     (q)  "FAIR MARKET VALUE" means, as of any date, the value of the common
stock determined as follows and, in each case, in a manner consistent with
Section 260.140.50 of Title 10 of the California Code of Regulations:

          (i)   If the common stock is listed on any established stock
exchange or a national market system, including without limitation the
National Market System of the National Association of Securities Dealers,
Inc. Automated Quotation ("NASDAQ") System, the Fair Market Value of a share
of common stock shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such system or exchange
(or the exchange with the greatest volume of trading in common stock) on the
last market trading day prior to the

<PAGE>

day of determination, as reported in the Wall Street Journal or such other
source as the Board deems reliable;

          (ii)  If the common stock is quoted on the NASDAQ System (but not
on the National Market System thereof) or is regularly quoted by a recognized
securities dealer but selling prices are not reported, the Fair Market Value
of a share of Common Stock shall be the mean between the bid and asked prices
for the common stock on the last market trading day prior to the day of
determination, as reported in the Wall Street Journal or such other source as
the Board deems reliable;

          (iii) In the absence of an established market for the common stock,
the Fair Market Value shall be determined in good faith by the Board.

     (r)  "INCENTIVE STOCK OPTION" means an Option intended to qualify as an
incentive stock option within the meaning of Section 422 of the Code and the
regulations promulgated thereunder.

     (s)  "INDEPENDENT STOCK APPRECIATION RIGHT" or "INDEPENDENT RIGHT" means
a right granted pursuant to subsection 8(b)(3) of the Plan.

     (t)  "LISTING DATE" means the first date upon which any security of the
Company is listed (or approved for listing) upon notice of issuance on any
securities exchange, or designated (or approved for designation) upon notice
of issuance as a national market security on an interdealer quotation system
if such securities exchange or interdealer quotation system has been
certified in accordance with the provisions of Section 25100(o) of the
California Corporate Securities Law of 1968.

     (u)  "NON-EMPLOYEE DIRECTOR" means a Director who either (i) is not a
current Employee or Officer of the Company or its parent or subsidiary, does
not receive compensation (directly or indirectly) from the Company or its
parent or subsidiary for services rendered as a consultant or in any capacity
other than as a Director (except for an amount as to which disclosure would
not be required under Item 404(a) of Regulation S-K promulgated pursuant to
the Securities Act ("Regulation S-K")), does not possess an interest in any
other transaction as to which disclosure would be required under Item 404(a)
of Regulation S-K, and is not engaged in a business relationship as to which
disclosure would be required under Item 404(b) of Regulation S-K; or (ii) is
otherwise considered a "non-employee" for purposes of Rule 16b-3.

     (v)  "NONSTATUTORY STOCK OPTION" means an Option not intended to qualify
as an Incentive Stock Option.

     (w)  "OFFICER" means a person who is an officer of the Company within
the meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

     (x)  "OPTION" means a stock option granted pursuant to the Plan.

<PAGE>

     (y)  "OPTION AGREEMENT" means a written agreement between the Company
and an Optionee evidencing the terms and conditions of an individual Option
grant. Each Option Agreement shall be subject to the terms and conditions of
the Plan.

     (z)  "OPTIONEE" means a person to whom an Option is granted pursuant to
the Plan or, if applicable, such other person who holds an outstanding Option.

     (aa) "OUTSIDE DIRECTOR" means a Director who either (i) is not a current
employee of the Company or an "affiliated corporation" (within the meaning of
the Treasury regulations promulgated under Section 162(m) of the Code), is
not a former employee of the Company or an "affiliated corporation" receiving
compensation for prior services (other than benefits under a tax qualified
pension plan), was not an officer of the Company or an "affiliated
corporation" at any time, and is not currently receiving direct or indirect
remuneration from the Company or an "affiliated corporation" for services in
any capacity other than as a Director, or (ii) is otherwise considered an
"outside director" for purposes of Section 162(m) of the Code.

     (bb) "PLAN" mans this 1996 Stock Plan.

     (cc) "RULE 16b-3" means Rule 16b-3 of the Exchange Act or any successor
to Rule 16b-3, as in effect with respect to the Company when discretion is
being exercised regarding the Plan.

     (dd) "SECURITIES ACT" means the Securities Act of 1933, as amended.

     (ee) "STOCK APPRECIATION RIGHT" means any of the various types of rights
which may be granted under Section 8 of the Plan.

     (ff) "STOCK AWARD" means any right granted under the Plan, including any
Option, any stock bonus, any right to purchase restricted stock, and any
Stock Appreciation Right.

     (gg) "STOCK AWARD AGREEMENT" means a written agreement between the
Company and a holder of a Stock Award evidencing the terms and conditions of
an individual Stock Award grant.  Each Stock Award Agreement shall be subject
to the terms and conditions of the Plan.

     (hh) "SURVIVING STOCK AWARDS" shall have the meaning set forth in
Section 13(b) of the Plan.

     (ii) "TANDEM STOCK APPRECIATION RIGHT" or "TANDEM RIGHT" means a right
granted pursuant to subsection 8(b)(1) of the Plan.

<PAGE>

3.   ADMINISTRATION.

     (a)  The Plan shall be administered by the Board unless and until the
Board delegates administration to a Committee, as provided in subsection 3(c).

     (b)  The Board shall have the power, subject to, and within the
limitations of, the express provisions of the Plan:

          (1)   To determine from time to time which of the persons eligible
under the Plan shall be granted Stock Awards; when and how each Stock Award
shall be granted; whether a Stock Award will be an Incentive Stock Option, a
Nonstatutory Stock Option, a stock bonus, a right to purchase restricted
stock, a Stock Appreciation Right, or a combination of the foregoing; the
provisions of each Stock Award granted (which need not be identical),
including the time or times when a person shall be permitted to receive stock
pursuant to a Stock Award; whether a person shall be permitted to receive
stock upon exercise of an Independent Stock Appreciation Right; and the
number of shares with respect to which a Stock Award shall be granted to each
such person.

          (2)   To construe and interpret the Plan and Stock Awards granted
under it, and to establish, amend and revoke rules and regulations for its
administration.  The Board, in the exercise of this power, may correct any
defect, omission or inconsistency in the Plan or in any Stock Award
Agreement, in a manner and to the extent it shall deem necessary or expedient
to make the Plan fully effective.

          (3)   To amend the Plan or a Stock Award as provided in Section 14.

          (4)   Generally, to exercise such powers and to perform such acts
as the Board deems necessary or expedient to promote the best interests of
the Company which are not in conflict with the provisions of the Plan.

     (c)  The Board may delegate administration of the Plan to a committee of
the Board composed of not fewer than two (2) members (the "Committee"), all
of the members of which Committee may be, in the discretion of the Board,
Non-Employee Directors and/or Outside Directors.  If administration is
delegated to a Committee, the Committee shall have, in connection with the
administration of the Plan, the powers theretofore possessed by the Board,
including the power to delegate to a subcommittee of two (2) or more Outside
Directors any of the administrative powers the Committee is authorized to
exercise (and references in this Plan to the Board shall thereafter be to the
Committee or such a subcommittee), subject, however, to such resolutions, not
inconsistent with the provisions of the Plan, as may be adopted from time to
time by the Board.  The Board may abolish the Committee at any time and
revest in the Board the administration of the Plan.  Additionally, prior to
the Listing Date, and notwithstanding anything to the contrary contained
herein, the Board may delegate administration of the Plan to a committee of
one or more members of the Board and the term Committee shall apply to any
person or persons to whom such authority has been delegated.  Notwithstanding
anything in this Section 3 to the contrary, the Board or the Committee may
delegate to a committee of one or more members of the Board the authority

<PAGE>

to grant Stock Awards to eligible persons who (1) are not then subject to
Section 16 of the Exchange Act and/or (2) are either (i) not then Covered
Employees and are not expected to be Covered Employees at the time of
recognition of income resulting from such Stock Award, or (ii) not persons
with respect to whom the Company wishes to comply with Section 162(m) of the
Code.

4.   SHARES SUBJECT TO THE PLAN.

     (a)  Subject to the provisions of Section 13 relating to adjustments
upon changes in stock, the stock that may be issued pursuant to Stock Awards
shall not exceed in the aggregate six million (6,000,000) shares of the
Company's common stock.  If any Stock Award shall for any reason expire or
otherwise terminate, in whole or in part, without having been exercised in
full, the stock not acquired under such Stock Award shall revert to and again
become available for issuance under the Plan.  Shares subject to Stock
Appreciation Rights exercised in accordance with Section 8 of the Plan shall
not be available for subsequent issuance under the Plan.

     (b)  The stock subject to the Plan may be unissued shares or reacquired
shares, bought on the market or otherwise.

5.   ELIGIBILITY.

     (a)  Incentive Stock Options and Stock Appreciation Rights appurtenant
thereto may be granted only to Employees.  Stock Awards other than Incentive
Stock Options and Stock Appreciation Rights appurtenant thereto may be
granted only to Employees, Directors or Consultants.

     (b)  No person shall be eligible for the grant of an Option or an award
to purchase restricted stock if, at the time of grant, such person owns (or
is deemed to own pursuant to Section 424(d) of the Code) stock possessing
more than ten percent (10%) of the total combined voting power of all classes
of stock of the Company or of any of its Affiliates unless the exercise price
of such Option is at least one hundred ten percent (110%) of the Fair Market
Value of such stock at the date of grant and the Option is not exercisable
after the expiration of five (5) years from the date of grant, or in the case
of a restricted stock purchase award, the purchase price is at least one
hundred percent (100%) of the Fair Market Value of such stock at the date of
grant.

     (c)  Subject to the provisions of Section 13 relating to adjustments
upon changes in stock, no person shall be eligible to be granted Options and
Stock Appreciation Rights covering more than two hundred thousand (200,000)
shares of the Company's common stock in any twelve (12) month period.  This
subsection 5(c) shall not apply prior to the Listing Date and, following the
Listing Date, shall not apply until (i) the earliest of:  (A) the first
material modification of the Plan (including any increase to the number of
shares reserved for issuance under the Plan in accordance with Section 4);
(B) the issuance of all of the shares of common stock reserved for issuance
under

<PAGE>

the Plan; (C) the expiration of the Plan; or (D) the first meeting of
stockholders at which directors are to be elected that occurs after the close
of the third calendar year following the calendar year in which occurred the
first registration of an equity security under section 12 of the Exchange
Act; or (ii) such other date required by Section 162(m) of the Code and the
rules and regulations promulgated thereunder.

6.   OPTION PROVISIONS.

     Each Option shall be in such form and shall contain such terms and
conditions as the Board shall deem appropriate.  The provisions of separate
Options need not be identical, but each Option shall include (through
incorporation of provisions hereof by reference in the Option or otherwise)
the substance of each of the following provisions:

     (a)  TERM.  No Option shall be exercisable after the expiration of ten
(10) years from the date it was granted.

     (b)  PRICE.  The exercise price of each Incentive Stock Option shall be
not less than one hundred percent (100%) of the Fair Market Value of the
stock subject to the Option on the date the Option is granted; the exercise
price of each Nonstatutory Stock Option shall be not less than eighty-five
percent (85%) of the Fair Market Value of the stock subject to the Option on
the date the Option is granted.  Notwithstanding the foregoing, an Option
(whether an Incentive Stock Option or a Nonstatutory Stock Option) may be
granted with an exercise price lower than that set forth in the preceding
sentence if such Option is granted pursuant to an assumption or substitution
for another option in a manner satisfying the provisions of Section 424(a) of
the Code.

     (c)  CONSIDERATION.  The purchase price of stock acquired pursuant to an
Option shall be paid, to the extent permitted by applicable statutes and
regulations, either (i) in cash at the time the Option is exercised, or (ii)
at the discretion of the Board or the Committee, at the time of the grant of
the Option, (A) by delivery to the Company of other common stock of the
Company, or (B) in any other form of legal consideration that may be
acceptable to the Board.

     (d)  TRANSFERABILITY.  An Option shall not be transferable except by
will or by the laws of descent and distribution, and shall be exercisable
during the lifetime of the person to whom the Option is granted only by such
person; PROVIDED, HOWEVER, that, after the Listing Date, to the extent
permitted by applicable law, a Nonstatutory Stock Option shall be
transferable by the person to whom such Option is granted upon such terms and
conditions as are set forth in the Option Agreement for such Nonstatutory
Stock Option, as the Board or Committee shall determine in its discretion.
Notwithstanding the foregoing, the person to whom the Option is granted may,
by delivering written notice to the Company, in a form satisfactory to the
Company, designate a third party who, in the event of the death of the
Optionee, shall thereafter be entitled to exercise the Option.

<PAGE>

     (e)  VESTING.  The total number of shares of stock subject to an Option
may, but need not, be allotted in periodic installments (which may, but need
not, be equal).  The Option Agreement may provide that from time to time
during each of such installment periods, the Option may become exercisable
("vest") with respect to some or all of the shares allotted to that period,
and may be exercised with respect to some or all of the shares allotted to
such period and/or any prior period as to which the Option became vested but
was not fully exercised.  The Option may be subject to such other terms and
conditions on the time or times when it may be exercised (which may be based
on performance or other criteria) as the Board may deem appropriate.  The
vesting provisions of individual Options may vary but in each case will
provide for vesting of at least twenty percent (20%) per year of the total
number of shares subject to the Option.  The provisions of this subsection
6(e) are subject to any Option provisions governing the minimum number of
shares as to which an Option may be exercised.

     (f)  TERMINATION OF EMPLOYMENT OR RELATIONSHIP AS A DIRECTOR OR
CONSULTANT. In the event an Optionee's Continuous Status as an Employee,
Director or Consultant terminates (other than upon the Optionee's death or
Disability), the Optionee may exercise his or her Option (to the extent that
the Optionee was entitled to exercise it as of the date of termination) but
only within such period of time ending on the earlier of (i) the date three
(3) months following the termination of the Optionee's Continuous Status as
an Employee, Director or Consultant (or such longer or shorter period, which
shall not be less than thirty (30) days, specified in the Option Agreement),
or (ii) the expiration of the term of the Option as set forth in the Option
Agreement.  If, after termination, the Optionee does not exercise his or her
Option within the time specified in the Option Agreement, the Option shall
terminate, and the shares covered by such Option shall revert to and again
become available for issuance under the Plan.

     An Optionee's Option Agreement may also provide that if the exercise of
the Option following the termination of the Optionee's Continuous Status as
an Employee, Director, or Consultant (other than upon the Optionee's death or
Disability) would result in liability under Section 16(b) of the Exchange
Act, then the Option shall terminate on the earlier of (i) the expiration of
the term of the Option set forth in the Option Agreement, or (ii) the tenth
(10th) day after the last date on which such exercise would result in such
liability under Section 16(b) of the Exchange Act.  Finally, an Optionee's
Option Agreement may also provide that if the exercise of the Option
following the termination of the Optionee's Continuous Status as an Employee,
Director or Consultant (other than upon the Optionee's death or Disability)
would be prohibited at any time solely because the issuance of shares would
violate the registration requirements under the Securities Act, then the
Option shall terminate on the earlier of (i) the expiration of the term of
the Option set forth in the first paragraph of this subsection 6(f), or (ii)
the expiration of a period of three (3) months after the termination of the
Optionee's Continuous Status as an Employee, Director or Consultant during
which the exercise of the Option would not be in violation of such
registration requirements.

     (g)  DISABILITY OF OPTIONEE.  In the event an Optionee's Continuous
Status as an Employee, Director or Consultant terminates as a result of the
Optionee's Disability, the Optionee may exercise his or her Option (to the
extent that the Optionee was entitled to exercise it as of the

<PAGE>

date of termination), but only within such period of time ending on the
earlier of (i) the date twelve (12) months following such termination (or
such longer or shorter period, which in no event shall be less than six (6)
months, specified in the Option Agreement), or (ii) the expiration of the
term of the Option as set forth in the Option Agreement.  If, at the date of
termination, the Optionee is not entitled to exercise his or her entire
Option, the shares covered by the unexercisable portion of the Option shall
revert to and again become available for issuance under the Plan.  If, after
termination, the Optionee does not exercise his or her Option within the time
specified herein, the Option shall terminate, and the shares covered by such
Option shall revert to and again become available for issuance under the Plan.

     (h)  DEATH OF OPTIONEE.  In the event of the death of an Optionee
during, or within a period specified in the Option Agreement after the
termination of, the Optionee's Continuous Status as an Employee, Director or
Consultant, the Option may be exercised (to the extent the Optionee was
entitled to exercise the Option as of the date of death) by the Optionee's
estate, by a person who acquired the right to exercise the Option by bequest
or inheritance or by a person designated to exercise the option upon the
Optionee's death pursuant to subsection 6(d), but only within the period
ending on the earlier of (i) the date eighteen (18) months following the date
of death (or such longer or shorter period, which in no event shall be less
than six (6) months, specified in the Option Agreement), or (ii) the
expiration of the term of such Option as set forth in the Option Agreement.
If, at the time of death, the Optionee was not entitled to exercise his or
her entire Option, the shares covered by the unexercisable portion of the
Option shall revert to and again become available for issuance under the
Plan.  If, after death, the Option is not exercised within the time specified
herein, the Option shall terminate, and the shares covered by such Option
shall revert to and again become available for issuance under the Plan.

     (i)  EARLY EXERCISE.  The Option may, but need not, include a provision
whereby the Optionee may elect at any time while an Employee, Director or
Consultant to exercise the Option as to any part or all of the shares subject
to the Option prior to the full vesting of the Option.  Any unvested shares
so purchased shall be subject to a repurchase right in favor of the Company,
with the repurchase price to be equal to the original purchase price of the
stock, or to any other restriction the Board determines to be appropriate;
PROVIDED, HOWEVER, that (i) the right to repurchase at the original purchase
price shall lapse at a minimum rate of twenty percent (20%) per year over
five (5) years from the date the Option was granted, and (ii) such right
shall be exercisable only within (A) the ninety (90) day period following the
termination of employment or the  relationship as a Director or Consultant,
or (B) such longer period as may be agreed to by the Company and the Optionee
(for example, for purposes of satisfying the requirements of Section
1202(c)(3) of the Code (regarding "qualified small business stock")), and
(iii) such right shall be exercisable only for cash or cancellation of
purchase money indebtedness for the shares.  Should the right of repurchase
be assigned by the Company, the assignee shall pay the Company cash equal to
the difference between the original purchase price and the stock's Fair
Market Value if the original purchase price is less than the stock's Fair
Market Value.

     (j)  RIGHT OF REPURCHASE.  The Option may, but need not, include a
provision whereby the Company may elect, prior to the Listing Date, to
repurchase all or any part of the vested shares

<PAGE>

exercised pursuant to the Option; PROVIDED, HOWEVER, that (i) such repurchase
right shall be exercisable only within (A) the ninety (90) day period
following the termination of employment or the relationship as a Director or
Consultant and (ii) such right shall be exercisable only for cash or
cancellation of purchase money indebtedness for the shares at a repurchase
price equal to the greater of (A) the stock's Fair Market Value at the time
of such termination, or (B) the original purchase price paid for such shares
by the Optionee.

     (k)  RIGHT OF FIRST REFUSAL.  The Option may, but need not, include a
provision whereby the Company may elect, prior to the Listing Date, to
exercise a right of first refusal following receipt of notice from the
Optionee of the intent to transfer all or any part of the shares exercised
pursuant to the Option.

     (l)  RE-LOAD OPTIONS.  Without in any way limiting the authority of the
Board or Committee to make or not to make grants of Options hereunder, the
Board or Committee shall have the authority (but not an obligation) to
include as part of any Option Agreement a provision entitling the Optionee to
a further Option (a "Re-Load Option") in the event the Optionee exercises the
Option evidenced by the Option agreement, in whole or in part, by
surrendering other shares of Common Stock in accordance with this Plan and
the terms and conditions of the Option Agreement.  Any such Re-Load Option
(i) shall be for a number of shares equal to the number of shares surrendered
as part or all of the exercise price of such Option; (ii) shall have an
expiration date which is the same as the expiration date of the Option the
exercise of which gave rise to such Re-Load Option; and (iii) shall have an
exercise price which is equal to one hundred percent (100%) of the Fair
Market Value of the Common Stock subject to the Re-Load Option on the date of
exercise of the original Option. Notwithstanding the foregoing, a Re-Load
Option which is granted to a 10% stockholder (as described in subsection
5(b)), shall have an exercise price which is equal to one hundred ten percent
(110%) of the Fair Market Value of the stock subject to the Re-Load Option on
the date of exercise of the original Option and shall have a term which is no
longer than five (5) years.

     Any such Re-Load Option may be an Incentive Stock Option or a
Nonstatutory Stock Option, as the Board or Committee may designate at the
time of the grant of the original Option; PROVIDED, HOWEVER, that the
designation of any Re-Load Option as an Incentive Stock Option shall be
subject to the one hundred thousand dollar ($100,000) annual limitation on
exercisability of Incentive Stock Options described in subsection 12(e) of
the Plan and in Section 422(d) of the Code. There shall be no Re-Load Options
on a Re-Load Option.  Any such Re-Load Option shall be subject to the
availability of sufficient shares under subsection 4(a) and the limits on the
grants of Options under subsection 5(c) and shall be subject to such other
terms and conditions as the Board or Committee may determine which are not
inconsistent with the express provisions of the Plan regarding the terms of
Options.

<PAGE>

7.   TERMS OF STOCK BONUSES AND PURCHASES OF RESTRICTED STOCK.

     Each stock bonus or restricted stock purchase agreement shall be in such
form and shall contain such terms and conditions as the Board or the
Committee shall deem appropriate.  The terms and conditions of stock bonus or
restricted stock purchase agreements may change from time to time, and the
terms and conditions of separate agreements need not be identical, but each
stock bonus or restricted stock purchase agreement shall include (through
incorporation of provisions hereof by reference in the agreement or
otherwise) the substance of each of the following provisions as appropriate:

     (a)  PURCHASE PRICE.  The purchase price under each restricted stock
purchase Stock Award Agreement shall be such amount as the Board or Committee
shall determine and designate in such agreement, but in no event shall the
purchase price be less than eighty-five percent (85%) of the stock's Fair
Market Value on the date such award is made.  Notwithstanding the foregoing,
the Board or the Committee may determine that eligible participants in the
Plan may be awarded stock pursuant to a stock bonus agreement in
consideration for past services actually rendered to the Company or for its
benefit.

     (b)  TRANSFERABILITY.  No rights under a stock bonus or restricted stock
purchase agreement shall be transferable except by will or the laws of
descent and distribution or pursuant to a QDRO satisfying the requirements of
Rule 16b-3 and any administrative interpretations or pronouncements
thereunder, so long as stock awarded under such agreement remains subject to
the terms of the agreement.

     (c)  CONSIDERATION.  The purchase price of stock acquired pursuant to a
stock purchase agreement shall be paid either:  (i) in cash at the time of
purchase; or (ii) in any other form of legal consideration that may be
acceptable to the Board or the Committee in its discretion.  Notwithstanding
the foregoing, the Board or the Committee to which administration of the Plan
has been delegated may award stock pursuant to a stock bonus agreement in
consideration for past services actually rendered to the Company or for its
benefit.

     (d)  VESTING.  Shares of stock sold or awarded under the Plan may, but
need not, be subject to a repurchase option in favor of the Company in
accordance with a vesting schedule to be determined by the Board or the
Committee.  The applicable agreement shall provide (i) that the right to
repurchase at the original purchase price shall lapse at a minimum rate of
twenty percent (20%) per year over five (5) years from the date the Stock
Award was granted, and (ii) such right shall be exercisable only (A) within
the ninety (90) day period following the termination of employment or the
relationship as a Director or Consultant, or (B) such longer period as may be
agreed to by the Company and the holder of the Stock Award (for example, for
purposes of satisfying the requirements of Section 1202(c)(3) of the Code
(regarding "qualified small business stock")), and (iii) such right shall be
exercisable only for cash or cancellation of purchase money indebtedness for
the shares.  Should the right of repurchase be assigned by the Company, the
assignee shall pay the Company cash equal to the difference between the
original purchase price

<PAGE>

and the stock's Fair Market Value if the original purchase price is less than
the stock's Fair Market Value.

     (e)  TERMINATION OF EMPLOYMENT OR RELATIONSHIP AS A DIRECTOR OR
CONSULTANT. In the event a participant's Continuous Status as an Employee,
Director or Consultant terminates, the Company may repurchase or otherwise
reacquire, subject to the limitations described in subsection 7(d), any or
all of the shares of stock held by that person which have not vested as of
the date of termination under the terms of the stock bonus or restricted
stock purchase agreement between the Company and such person.

8.   STOCK APPRECIATION RIGHTS.

     (a)  The Board or Committee shall have full power and authority,
exercisable in its sole discretion, to grant Stock Appreciation Rights under
the Plan to Employees or Directors of or Consultants to, the Company or its
Affiliates.  To exercise any outstanding Stock Appreciation Right, the holder
must provide written notice of exercise to the Company in compliance with the
provisions of the Stock Award Agreement evidencing such right.  If a Stock
Appreciation Right is granted to an individual who is at the time of grant
subject to Section 16(b) of the Exchange Act, the Stock Award Agreement shall
incorporate all the terms and conditions at the time necessary to assure that
the subsequent exercise of such right shall qualify for the safe-harbor
exemption from short-swing profit liability provided by Rule 16b-3
promulgated under the Exchange Act (or any successor rule or regulation).
Except as provided in subsection 5(c), no limitation shall exist on the
aggregate amount of cash payments the Company may make under the Plan in
connection with the exercise of a Stock Appreciation Right.

     (b)  Three types of Stock Appreciation Rights shall be authorized for
issuance under the Plan:

          (1)   TANDEM STOCK APPRECIATION RIGHTS.  Tandem Stock Appreciation
Rights will be granted appurtenant to an Option, and shall, except as
specifically set forth in this Section 8, be subject to the same terms and
conditions applicable to the particular Option grant to which it pertains.
Tandem Stock Appreciation Rights will require the holder to elect between the
exercise of the underlying Option for shares of stock and the surrender, in
whole or in part, of such Option for an appreciation distribution.  The
appreciation distribution payable on the exercised Tandem Right shall be in
cash (or, if so provided, in an equivalent number of shares of stock based on
Fair Market Value on the date of the Option surrender) in an amount up to the
excess of (A) the Fair Market Value (on the date of the Option surrender) of
the number of shares of stock covered by that portion of the surrendered
Option in which the Optionee is vested over (B) the aggregate exercise price
payable for such vested shares.

          (2)   CONCURRENT STOCK APPRECIATION RIGHTS.  Concurrent Rights will
be granted appurtenant to an Option and may apply to all or any portion of
the shares of stock subject to the underlying Option and shall, except as
specifically set forth in this Section 8, be subject to the

<PAGE>

same terms and conditions applicable to the particular Option grant to which
it pertains.  A Concurrent Right shall be exercised automatically at the same
time the underlying Option is exercised with respect to the particular shares
of stock to which the Concurrent Right pertains.  The appreciation
distribution payable on an exercised Concurrent Right shall be in cash (or,
if so provided, in an equivalent number of shares of stock based on Fair
Market Value on the date of the exercise of the Concurrent Right) in an
amount equal to such portion as shall be determined by the Board or the
Committee at the time of the grant of the excess of (A) the aggregate Fair
Market Value (on the date of the exercise of the Concurrent Right) of the
vested shares of stock purchased under the underlying Option which have
Concurrent Rights appurtenant to them over (B) the aggregate exercise price
paid for such shares.

          (3)   INDEPENDENT STOCK APPRECIATION RIGHTS.  Independent Rights
will be granted independently of any Option and shall, except as specifically
set forth in this Section 8, be subject to the same terms and conditions
applicable to Nonstatutory Stock Options as set forth in Section 6.  They
shall be denominated in share equivalents.  The appreciation distribution
payable on the exercised Independent Right shall be not greater than an
amount equal to the excess of (A) the aggregate Fair Market Value (on the
date of the exercise of the Independent Right) of a number of shares of
Company stock equal to the number of share equivalents in which the holder is
vested under such Independent Right, and with respect to which the holder is
exercising the Independent Right on such date, over (B) the aggregate Fair
Market Value (on the date of the grant of the Independent Right) of such
number of shares of Company stock.  The appreciation distribution payable on
the exercised Independent Right shall be in cash or, if so provided, in an
equivalent number of shares of stock based on Fair Market Value on the date
of the exercise of the Independent Right.

9.   CANCELLATION AND RE-GRANT OF OPTIONS.

     (a)  The Board or the Committee shall have the authority to effect, at
any time and from time to time,  (i) the repricing of any outstanding Options
and/or any Stock Appreciation Rights under the Plan and/or (ii) with the
consent of the affected holders of Options and/or Stock Appreciation Rights,
the cancellation of any outstanding Options and/or any Stock Appreciation
Rights under the Plan and the grant in substitution therefor of new Options
and/or Stock Appreciation Rights under the Plan covering the same or
different numbers of shares of stock, but having an exercise price per share
not less than eighty-five percent (85%) of the Fair Market Value (one hundred
percent (100%) of the Fair Market Value in the case of an Incentive Stock
Option) or, in the case of a 10% stockholder (as described in subsection
5(b)), not less than one hundred ten percent (110%) of the Fair Market Value)
per share of stock on the new grant date. Notwithstanding the foregoing, the
Board or the Committee may grant an Option and/or Stock Appreciation Right
with an exercise price lower than that set forth above if such Option and/or
Stock Appreciation Right is granted as part of a transaction to which section
424(a) of the Code applies.

     (b)  Shares subject to an Option or Stock Appreciation Right canceled
under this Section 9 shall continue to be counted against the maximum award
of Options and Stock Appreciation

<PAGE>

Rights permitted to be granted pursuant to subsection 5(c) of the Plan.  The
repricing of an Option and/or Stock Appreciation Right under this Section 9,
resulting in a reduction of the exercise price, shall be deemed to be a
cancellation of the original Option and/or Stock Appreciation Right and the
grant of a substitute Option and/or Stock Appreciation Right; in the event of
such repricing, both the original and the substituted Options and Stock
Appreciation Rights shall be counted against the maximum awards of Options
and Stock Appreciation Rights permitted to be granted pursuant to subsection
5(c) of the Plan.  The provisions of this subsection 9(b) shall be applicable
only to the extent required by Section 162(m) of the Code.

10.  COVENANTS OF THE COMPANY.

     (a)  During the terms of the Stock Awards, the Company shall keep
available at all times the number of shares of stock required to satisfy such
Stock Awards.

     (b)  The Company shall seek to obtain from each regulatory commission or
agency having jurisdiction over the Plan such authority as may be required to
issue and sell shares of stock upon exercise of the Stock Award; provided,
however, that this undertaking shall not require the Company to register
under the Securities Act either the Plan, any Stock Award or any stock issued
or issuable pursuant to any such Stock Award.  If, after reasonable efforts,
the Company is unable to obtain from any such regulatory commission or agency
the authority which counsel for the Company deems necessary for the lawful
issuance and sale of stock under the Plan, the Company shall be relieved from
any liability for failure to issue and sell stock upon exercise of such Stock
Awards unless and until such authority is obtained.

11.  USE OF PROCEEDS FROM STOCK.

     Proceeds from the sale of stock pursuant to Stock Awards shall
constitute general funds of the Company.

12.  MISCELLANEOUS.

     (a)  Neither an Employee, Director or Consultant nor any person to whom
a Stock Award is transferred under subsection 6(d), 7(b), or 8(b) shall be
deemed to be the holder of, or to have any of the rights of a holder with
respect to, any shares subject to such Stock Award unless and until such
person has satisfied all requirements for exercise of the Stock Award
pursuant to its terms.

     (b)  Throughout the term of any Stock Award, the Company shall deliver
to the holder of such Stock Award, not later than one hundred twenty (120)
days after the close of each of the Company's fiscal years during the term of
such Stock Award, a balance sheet and an income

<PAGE>

statement.  This subsection shall not apply when issuance is limited to key
employees whose duties in connection with the Company assure them access to
equivalent information.

     (c)  Nothing in the Plan or any instrument executed or Stock Award
granted pursuant thereto shall confer upon any Employee, Director, Consultant
or other holder of Stock Awards any right to continue in the employ of the
Company or any Affiliate (or to continue acting as a Director or Consultant)
or shall affect the right of the Company or any Affiliate to terminate the
employment of any Employee with or without cause, the right of the Company's
Board of Directors and/or the Company's stockholders to remove any Director
as provided in the Company's By-Laws and the provisions of the Delaware
General Corporation Law or the right to terminate the relationship of any
Consultant subject to the terms of such Consultant's agreement with the
Company or Affiliate.

     (d)  To the extent that the aggregate Fair Market Value (determined at
the time of grant) of stock with respect to which Incentive Stock Options are
exercisable for the first time by any Optionee during any calendar year under
all plans of the Company and its Affiliates exceeds one hundred thousand
dollars ($100,000), the Options or portions thereof which exceed such limit
(according to the order in which they were granted) shall be treated as
Nonstatutory Stock Options.

     (e)  The Company may require any person to whom a Stock Award is
granted, or any person to whom a Stock Award is transferred pursuant to
subsection 6(d), 7(b) or 8(b), as a condition of exercising or acquiring
stock under any Stock Award, (1) to give written assurances satisfactory to
the Company as to such person's knowledge and experience in financial and
business matters and/or to employ a purchaser representative reasonably
satisfactory to the Company who is knowledgeable and experienced in financial
and business matters, and that he or she is capable of evaluating, alone or
together with the purchaser representative, the merits and risks of
exercising the Stock Award; and (2) to give written assurances satisfactory
to the Company stating that such person is acquiring the stock subject to the
Stock Award for such person's own account and not with any present intention
of selling or otherwise distributing the stock. The foregoing requirements,
and any assurances given pursuant to such requirements, shall be inoperative
if (i) the issuance of the shares upon the exercise or acquisition of stock
under the Stock Award has been registered under a then currently effective
registration statement under the Securities Act, or (ii) as to any particular
requirement, a determination is made by counsel for the Company that such
requirement need not be met in the circumstances under the then applicable
securities laws.  The Company may, upon advice of counsel to the Company,
place legends on stock certificates issued under the Plan as such counsel
deems necessary or appropriate in order to comply with applicable securities
laws, including, but not limited to, legends restricting the transfer of the
stock.

     (f)  To the extent provided by the terms of a Stock Award Agreement, the
person to whom a Stock Award is granted may satisfy any federal, state or
local tax withholding obligation relating to the exercise or acquisition of
stock under a Stock Award by any of the following means or by a combination
of such means:  (1) tendering a cash payment; (2) authorizing the Company to
withhold shares from the shares of the common stock otherwise issuable to the
participant as a result of the exercise or acquisition of stock under the
Stock Award; or (3) delivering to the Company owned and unencumbered shares
of the common stock of the Company.

<PAGE>

13.  ADJUSTMENTS UPON CHANGES IN STOCK.

     (a)  If any change is made in the stock subject to the Plan, or subject
to any Stock Award (through merger, consolidation, reorganization,
recapitalization, reincorporation, stock dividend, dividend in property other
than cash, stock split, liquidating dividend, combination of shares, exchange
of shares, change in corporate structure or other transaction not involving
the receipt of consideration by the Company), the Plan will be appropriately
adjusted in the type(s) and maximum number of securities subject to the Plan
pursuant to subsection 4(a) and the maximum number of securities subject to
award to any person during any twelve (12) month period pursuant to
subsection 5(c), and the outstanding Stock Awards will be appropriately
adjusted in the type(s) and number of securities and price per share of stock
subject to such outstanding Stock Awards.  Such adjustments shall be made by
the Board or the Committee, the determination of which shall be final,
binding and conclusive. (The conversion of any convertible securities of the
Company shall not be treated as a "transaction not involving the receipt of
consideration by the Company".)

     (b)  In the event of a Change in Control, then: (i) any surviving or
acquiring corporation shall assume any Stock Awards outstanding under the
Plan or shall substitute similar stock awards (including an award to acquire
the same consideration paid to the stockholders in such Change in Control)
for those outstanding under the Plan (such assumed or substituted stock
awards are collectively referred to herein as the "SURVIVING STOCK AWARDS"),
or (ii) in the event any surviving or acquiring corporation refuses to assume
such Stock Awards or to substitute similar stock awards for those outstanding
under the Plan (A) with respect to Stock Awards held by persons performing
services as Employees, Directors or Consultants immediately prior to the
effective date of such Change in Control, subject to any applicable
provisions of the California Corporate Securities Law of 1968 and related
regulations relied upon as a condition of issuing securities pursuant to the
Plan, the vesting of such Stock Awards (and, if applicable, the time during
which such Stock Awards may be exercised) shall be accelerated prior to such
event and such Stock Awards terminated if not exercised (if applicable) after
such acceleration and at or prior to such event, and (B) unless otherwise
provided in this Section 13, with respect to any other Stock Awards
outstanding under the Plan, such Stock Awards shall be terminated if not
exercised (if applicable) prior to the effective date of such Change in
Control.

     (c)  In addition, with respect to any person (i) who is Constructively
Terminated within the sixty (60) day period immediately preceding the
effective date of a Change in Control or (ii) whose Continuous Status as an
Employee, Director or Consultant is terminated by the Company within the
sixty (60) day period immediately preceding the effective date of a Change in
Control other than (A) for Cause or (B) upon such person's death or
Disability, any Stock Awards held by such person shall:  (a) become fully
vested, and any repurchase right held by the Company with respect to shares
acquired by such person under a Stock Award shall lapse, immediately upon the
effective date of such Change in Control, (b) in the event such Stock Award
is granted after May 28, 1998 or has an exercise price in excess of $7.50 per
share (as adjusted for stock splits and the like subsequent to May 28, 1998)
be exercisable within the

<PAGE>

period ending on the earlier of (u) twelve (12) months following termination
of such person's Continuous Status as an Employee, Director or Consultant or
(v) expiration of the term of such Stock Award, as set forth therein or as
otherwise provided in the Plan and (c) terminate immediately upon the
completion of the period described in clause (b) of this sentence, if
applicable, or as provided in such Stock Award.

     (d)  Further, with respect to any person (i) who was providing services
as an Employee, Director or Consultant immediately prior to the effective
date of a Change in Control and (ii) (A) who is Constructively Terminated
within the thirteen (13) month period following the effective date of such
Change in Control or (B) whose Continuous Status as an Employee, Director or
Consultant is terminated by the surviving or acquiring corporation within the
thirteen (13) month period following the effective date of such Change in
Control other than (w) for Cause or (x) upon such person's death or
Disability, any Surviving Stock Awards held by such person shall:  (a) become
fully vested, and any repurchase right held by the acquiring or surviving
corporation with respect to shares acquired by such person under a Surviving
Stock Award shall lapse, immediately upon termination of such person's
Continuous Status as an Employee, Director or Consultant, (b) in the event
such Stock Award is granted after May 28, 1998 or has an exercise price in
excess of $7.50 per share (as adjusted for stock splits and the like
subsequent to May 28, 1998) be exercisable within the period ending on the
earlier of (y) twelve (12) months following termination of such person's
Continuous Status as an Employee, Director or Consultant or (z) expiration of
the term of such Surviving Stock Award, as set forth therein or as otherwise
provided in the Plan and (c) terminate immediately upon completion of the
period described in clause (b) of this sentence, if applicable, or as
provided in such Stock Award.

     (e)  Notwithstanding subsections 13(c) and (d) above, in the event all
of the following occurs:  (i) a contemplated Change in Control would occur
prior to May 28, 2000 (the date two (2) years following the adoption of
subsections 13(c) through (h)); (ii) such potential acceleration of vesting
(and exercisability) under subsections 13(c) or (d) would BY ITSELF cause a
contemplated Change in Control, that would otherwise be eligible to be
accounted for as a "pooling of interests" accounting transaction, to become
ineligible for such accounting treatment; and (iii) the potential acquiror of
the Company desires to account for such contemplated Change in Control as a
"pooling of interests" transaction, then such acceleration shall not occur.
Additionally, in the event that the restrictions upon acceleration provided
for in the immediately preceding sentence BY ITSELF would cause a
contemplated Change in Control to become ineligible to be accounted for as a
"pooling of interests" accounting transaction, then such restrictions shall
be deemed inoperative.  Accounting issues shall be determined by the
Company's independent public accountants applying generally accepted
accounting principles.

     (f)  The terms of a particular Stock Award may provide for different
terms to govern events described in this Section 13.  In the event the
provisions of this Section 13 conflict with an employment agreement or other
agreement relating to the rights of the holder of a Stock Award, the
provisions of this Section 13 and the conflicting agreement shall be
construed to provide the greatest benefit to the holder of the Stock Award.

<PAGE>

14.  AMENDMENT OF THE PLAN AND STOCK AWARDS.

     (a)  The Board at any time, and from time to time, may amend the Plan.
However, except as provided in Section 13 relating to adjustments upon
changes in stock, no amendment shall be effective unless approved by the
stockholders of the Company within twelve (12) months before or after the
adoption of the amendment, where the amendment will:

                (i)   Increase the number of shares reserved for Stock Awards
under the Plan;

                (ii)  Modify the requirements as to eligibility for
participation in the Plan (to the extent such modification requires
stockholder approval in order for the Plan to satisfy the requirements of
Section 422 of the Code); or

                (iii) Modify the Plan in any other way if such modification
requires stockholder approval in order for the Plan to satisfy the
requirements of Section 422 of the Code or to comply with the requirements of
Rule 16b-3.

     (b)  The Board may in its sole discretion submit any other amendment to
the Plan for stockholder approval, including, but not limited to, amendments
to the Plan intended to satisfy the requirements of Section 162(m) of the
Code and the regulations promulgated thereunder regarding the exclusion of
performance-based compensation from the limit on corporate deductibility of
compensation paid to certain executive officers.

     (c)  It is expressly contemplated that the Board may amend the Plan in
any respect the Board deems necessary or advisable to provide eligible
Employees with the maximum benefits provided or to be provided under the
provisions of the Code and the regulations promulgated thereunder relating to
Incentive Stock Options and/or to bring the Plan and/or Incentive Stock
Options granted under it into compliance therewith.

     (d)  Rights and obligations under any Stock Award granted before
amendment of the Plan shall not be impaired by any amendment of the Plan
unless (i) the Company requests the consent of the person to whom the Stock
Award was granted and (ii) such person consents in writing.

     (e)  The Board at any time, and from time to time, may amend the terms
of any one or more Stock Award; provided, however, that the rights and
obligations under any Stock Award shall not be impaired by any such amendment
unless (i) the Company requests the consent of the person to whom the Stock
Award was granted and (ii) such person consents in writing.

<PAGE>

15.  TERMINATION OR SUSPENSION OF THE PLAN.

     (a)  The Board may suspend or terminate the Plan at any time.  Unless
sooner terminated, the Plan shall terminate on January 22, 2006, which shall
be within ten (10) years from the date the Plan is adopted by the Board or
approved by the stockholders of the Company, whichever is earlier.  No Stock
Awards may be granted under the Plan while the Plan is suspended or after it
is terminated.

     (b)  Rights and obligations under any Stock Award granted while the Plan
is in effect shall not be impaired by suspension or termination of the Plan,
except with the written consent of the person to whom the Stock Award was
granted.

16.  EFFECTIVE DATE OF PLAN.

     The Plan shall become effective as determined by the Board, but no Stock
Awards granted under the Plan shall be exercised unless and until the Plan
has been approved by the stockholders of the Company, which approval shall be
within twelve (12) months before or after the date the Plan is adopted by the
Board, and, if required, an appropriate permit has been issued by the
Commissioner of Corporations of the State of California.


<PAGE>

                           AURORA BIOSCIENCES CORPORATION
                           EMPLOYEE STOCK PURCHASE PLAN

                              ADOPTED FEBRUARY 4, 1997

                     AS AMENDED AND RESTATED AS OF MAY 4, 1999

   (SHARE NUMBERS HEREIN HAVE BEEN ADJUSTED TO REFLECT THE FOUR FOR FIVE REVERSE
                      STOCK SPLIT EFFECTED ON APRIL 25, 1997)

1.   PURPOSE.

     (a)  The purpose of the Employee Stock Purchase Plan (the "Plan") is to
provide a means by which employees of Aurora Biosciences Corporation, a
Delaware corporation (the "Company"), and its Affiliates, as defined in
subparagraph 1(b), which are designated as provided in subparagraph 2(b), may
be given an opportunity to purchase stock of the Company.

     (b)  The word "Affiliate" as used in the Plan means any parent
corporation or subsidiary corporation of the Company, as those terms are
defined in Sections 424(e) and (f), respectively, of the Internal Revenue
Code of 1986, as amended (the "Code").

     (c)  The Company, by means of the Plan, seeks to retain the services of
its employees, to secure and retain the services of new employees, and to
provide incentives for such persons to exert maximum efforts for the success
of the Company.

     (d)  The Company intends that the rights to purchase stock of the
Company granted under the Plan be considered options issued under an
"employee stock purchase plan" as that term is defined in Section 423(b) of
the Code.

2.   ADMINISTRATION.

     (a)  The Plan shall be administered by the Board of Directors (the
"Board") of the Company unless and until the Board delegates administration
to a Committee, as provided in subparagraph 2(c).  Whether or not the Board
has delegated administration, the Board shall have the final power to
determine all questions of policy and expediency that may arise in the
administration of the Plan.

     (b)  The Board shall have the power, subject to, and within the
limitations of, the express provisions of the Plan:

          (i)   To determine when and how rights to purchase stock of the
Company shall be granted and the provisions of each offering of such rights
(which need not be identical).

          (ii)  To designate from time to time which Affiliates of the
Company shall be eligible to participate in the Plan.

          (iii) To construe and interpret the Plan and rights granted under
it, and to establish, amend and revoke rules and regulations for its
administration. The Board, in the

                                       1

<PAGE>

exercise of this power, may correct any defect, omission or inconsistency in
the Plan, in a manner and to the extent it shall deem necessary or expedient
to make the Plan fully effective.

          (iv)  To amend the Plan as provided in paragraph 13.

          (v)   Generally, to exercise such powers and to perform such acts
as the Board deems necessary or expedient to promote the best interests of
the Company and its Affiliates.

     (c)  The Board may delegate administration of the Plan to a Committee
composed of not fewer than two (2) members of the Board (the "Committee").
If administration is delegated to a Committee, the Committee shall have, in
connection with the administration of the Plan, the powers theretofore
possessed by the Board, subject, however, to such resolutions, not
inconsistent with the provisions of the Plan, as may be adopted from time to
time by the Board.  The Board may abolish the Committee at any time and
revest in the Board the administration of the Plan.

3.   SHARES SUBJECT TO THE PLAN.

     (a)  Subject to the provisions of paragraph 12 relating to adjustments
upon changes in stock, the stock that may be sold pursuant to rights granted
under the Plan shall not exceed in the aggregate seven hundred thousand
(700,000) shares of the Company's common stock (the "Common Stock").  If any
right granted under the Plan shall for any reason terminate without having
been exercised, the Common Stock not purchased under such right shall again
become available for the Plan.

     (b)  The stock subject to the Plan may be unissued shares or reacquired
shares, bought on the market or otherwise.

4.   GRANT OF RIGHTS; OFFERING.

     (a)  The Board or the Committee may from time to time grant or provide
for the grant of rights to purchase Common Stock of the Company under the
Plan to eligible employees (an "Offering") on a date or dates (the "Offering
Date(s)") selected by the Board or the Committee.  Each Offering shall be in
such form and shall contain such terms and conditions as the Board or the
Committee shall deem appropriate, which shall comply with the requirements of
Section 423(b)(5) of the Code that all employees granted rights to purchase
stock under the Plan shall have the same rights and privileges.  The
provisions of separate Offerings need not be identical, but each Offering
shall include (through incorporation of the provisions of this Plan by
reference in the Offering or otherwise) the period during which the Offering
shall be effective, which period shall not exceed twenty-seven (27) months
beginning with the Offering Date, and the substance of the provisions
contained in paragraphs 5 through 8, inclusive.

     (b)  If an employee has more than one right outstanding under the Plan,
unless he or she otherwise indicates in agreements or notices delivered
hereunder:  (1) each agreement or notice delivered by that employee will be
deemed to apply to all of his or her rights under the Plan, and (2) a right
with a lower exercise price (or an earlier-granted right, if two rights have
identical exercise prices), will be exercised to the fullest possible extent
before a right with a

                                       2
<PAGE>

higher exercise price (or a later-granted right, if two rights have identical
exercise prices) will be exercised.

5.   ELIGIBILITY.

     (a)  Rights may be granted only to employees of the Company or, as the
Board or the Committee may designate as provided in subparagraph 2(b), to
employees of any Affiliate of the Company.  Except as provided in
subparagraph 5(b), an employee of the Company or any Affiliate shall not be
eligible to be granted rights under the Plan, unless, on the Offering Date,
such employee is in the employ of the Company and has been in the employ of
the Company or any Affiliate for such continuous period preceding such grant
as the Board or the Committee may require, but in no event shall the required
period of continuous employment be greater than two (2) years.  In addition,
unless otherwise determined by the Board or the Committee and set forth in
the terms of the applicable Offering, no employee of the Company or any
Affiliate shall be eligible to be granted rights under the Plan, unless, on
the Offering Date, such employee's customary employment with the Company or
such Affiliate is for at least twenty (20) hours per week and at least five
(5) months per calendar year.

     (b)  Each person who, during the course of an Offering, first becomes an
eligible employee of the Company or designated Affiliate shall not be
eligible to be granted rights under such Offering.

     (c)  No employee shall be eligible for the grant of any rights under the
Plan if, immediately after any such rights are granted, such employee owns
stock possessing five percent (5%) or more of the total combined voting power
or value of all classes of stock of the Company or of any Affiliate.  For
purposes of this subparagraph 5(c), the rules of Section 424(d) of the Code
shall apply in determining the stock ownership of any employee, and stock
which such employee may purchase under all outstanding rights and options
shall be treated as stock owned by such employee.

     (d)  An eligible employee may be granted rights under the Plan only if
such rights, together with any other rights granted under "employee stock
purchase plans" of the Company and any Affiliates, as specified by Section
423(b)(8) of the Code, do not permit such employee's rights to purchase stock
of the Company or any Affiliate to accrue at a rate which exceeds twenty-five
thousand dollars ($25,000) of fair market value of such stock (determined at
the time such rights are granted) for each calendar year in which such rights
are outstanding at any time.

     (e)  Officers of the Company and any designated Affiliate shall be
eligible to participate in Offerings under the Plan, provided, however, that
the Board may provide in an Offering that certain employees who are highly
compensated employees within the meaning of Section 423(b)(4)(D) of the Code
shall not be eligible to participate.

6.   RIGHTS; PURCHASE PRICE.

     (A)  On each Offering Date, each eligible employee, pursuant to an
Offering made under the Plan, shall be granted the right to purchase up to
the number of shares of Common Stock of the Company purchasable with a
percentage designated by the Board or the Committee not exceeding fifteen
percent (15%) of such employee's Earnings (as defined in subparagraph

                                       3
<PAGE>

7(a)) during the period which begins on the Offering Date (or such later date
as the Board or the Committee determines for a particular Offering) and ends
on the date stated in the Offering, which date shall be no later than the end
of the Offering.  The Board or the Committee shall establish one or more
dates during an Offering (the "Purchase Date(s)") on which rights granted
under the Plan shall be exercised and purchases of Common Stock effected in
accordance with such Offering.

     (b)  In connection with each Offering made under this Plan, the Board or
the Committee shall specify a maximum number of shares which may be purchased
by any employee as well as a maximum aggregate number of shares which may be
purchased by all eligible employees pursuant to such Offering.  In addition,
in connection with each Offering which contains more than one Purchase Date,
the Board or the Committee may specify a maximum aggregate number of shares
which may be purchased by all eligible employees on any given Purchase Date
under the Offering.  If the aggregate purchase of shares upon exercise of
rights granted under the Offering would exceed any such maximum aggregate
number, the Board or the Committee shall make a pro rata allocation of the
shares available in as nearly a uniform manner as shall be practicable and as
it shall deem to be equitable.

     (c)  The purchase price of stock acquired pursuant to rights granted
under the Plan shall be not less than the lesser of:

          (i)   an amount equal to eighty-five percent (85%) of the fair
market value of the stock on the Offering Date; or

          (ii)  an amount equal to eighty-five percent (85%) of the fair
market value of the stock on the Purchase Date.

7.   PARTICIPATION; WITHDRAWAL; TERMINATION.

     (a)  An eligible employee may become a participant in the Plan pursuant
to an Offering by delivering a participation agreement to the Company within
the time specified in the Offering, in such form as the Company provides;
provided, however, that an eligible employee shall be entitled to participate
in no more than one (1) Offering at any time.  Each such agreement shall
authorize payroll deductions of up to the maximum percentage specified by the
Board or the Committee of such employee's Earnings during the Offering.
"Earnings" is defined as an employee's regular salary or wages (including
amounts thereof elected to be deferred by the employee, that would otherwise
have been paid, under any cash or deferred arrangement established by the
Company), which shall include commissions and overtime pay, but shall exclude
bonuses, incentive pay, profit sharing, other remuneration paid directly to
the employee, the cost of employee benefits paid for by the Company or an
Affiliate, education or tuition reimbursements, imputed income arising under
any group insurance or benefit program, traveling expenses, business and
moving expense reimbursements, income received in connection with stock
options, contributions made by the Company or an Affiliate under any employee
benefit plan, and similar items of compensation. The payroll deductions made
for each participant shall be credited to an account for such participant
under the Plan and shall be deposited with the general funds of the Company
or an Affiliate.  A participant may reduce (including to zero) or increase
such payroll deductions after the beginning of any Offering only

                                       4
<PAGE>

as provided for in the Offering.  A participant may not make additional
payments into his or her account.

     (b)  At any time during an Offering, a participant may terminate his or
her payroll deductions under the Plan and withdraw from the Offering by
delivering to the Company a notice of withdrawal in such form as the Company
provides. Such withdrawal may be elected at any time prior to the end of the
Offering except as provided by the Board or the Committee in the Offering.
Upon such withdrawal from the Offering by a participant, the Company shall
distribute to such participant all of his or her accumulated payroll
deductions (reduced to the extent, if any, such deductions have been used to
acquire stock for the participant) under the Offering, without interest, and
such participant's interest in that Offering shall be automatically
terminated.  A participant's withdrawal from an Offering will have no effect
upon such participant's eligibility to participate in any other Offerings
under the Plan but such participant will be required to deliver a new
participation agreement in order to participate in subsequent Offerings under
the Plan.  A reduction of payroll deductions to zero shall not, by itself,
constitute a withdrawal from an Offering.

     (c)  Rights granted pursuant to any Offering under the Plan shall
terminate immediately upon cessation of any participating employee's
employment with the Company and any designated Affiliate, for any reason, and
the Company shall distribute to such terminated employee all of his or her
accumulated payroll deductions (reduced to the extent, if any, such
deductions have been used to acquire stock for the terminated employee),
under the Offering, without interest.

     (d)  Rights granted under the Plan shall not be transferable, and,
except as provided in paragraph 14, shall be exercisable only by the person
to whom such rights are granted.

8.   EXERCISE.

     (a)  On each date specified therefor in the relevant Offering ("Purchase
Date"), each participant's accumulated payroll deductions (without any
increase for interest) will be applied to the purchase of whole shares of
stock of the Company, up to the maximum number of shares permitted pursuant
to the terms of the Plan and the applicable Offering, at the purchase price
specified in the Offering.  No fractional shares shall be issued upon the
exercise of rights granted under the Plan.  The amount, if any, of
accumulated payroll deductions remaining in each participant's account after
the purchase of shares on the final Purchase Date of an Offering shall be
distributed to the participant after such final Purchase Date, without
interest.

     (b)  No rights granted under the Plan may be exercised to any extent
unless the Plan (including rights granted thereunder) is covered by an
effective registration statement pursuant to the Securities Act of 1933, as
amended (the "Securities Act") and the Plan is in material compliance with
all applicable state, foreign and other securities and other laws applicable
to the Plan.  If on a Purchase Date in any Offering hereunder the Plan is not
so registered, no rights granted under the Plan or any Offering shall be
exercised on such Purchase Date, and the Purchase Date shall be delayed until
the Plan is subject to such an effective registration statement and in such
compliance, except that the Purchase Date shall not be delayed more than
twelve (12) months and the Purchase Date shall in no event be more than
twenty-seven (27) months

                                       5
<PAGE>

from the Offering Date.  If on the Purchase Date of any Offering hereunder,
as delayed to the maximum extent permissible, the Plan is not registered and
in such compliance, no rights granted under the Plan or any Offering shall be
exercised and all payroll deductions accumulated during the Offering (reduced
to the extent, if any, such deductions have been used to acquire stock) shall
be distributed to the participants, without interest.

9.   COVENANTS OF THE COMPANY.

     (a)  During the terms of the rights granted under the Plan, the Company
shall keep available at all times the number of shares of stock required to
satisfy such rights.

     (b)  The Company shall seek to obtain from each regulatory commission or
agency having jurisdiction over the Plan such authority as may be required to
issue and sell shares of stock upon exercise of the rights granted under the
Plan.  If, after reasonable efforts, the Company is unable to obtain from any
such regulatory commission or agency the authority which counsel for the
Company deems necessary for the lawful issuance and sale of stock under the
Plan, the Company shall be relieved from any liability for failure to issue
and sell stock upon exercise of such rights unless and until such authority
is obtained.

10.  USE OF PROCEEDS FROM STOCK.

     Proceeds from the sale of stock pursuant to rights granted under the
Plan shall constitute general funds of the Company.

11.  RIGHTS AS A STOCKHOLDER.

     A participant shall not be deemed to be the holder of, or to have any of
the rights of a holder with respect to, any shares subject to rights granted
under the Plan unless and until the participant's stockholdings acquired upon
exercise of rights under the Plan are recorded in the books of the Company.

12.  ADJUSTMENTS UPON CHANGES IN STOCK.

     (a)  If any change is made in the stock subject to the Plan, or subject
to any rights granted under the Plan (through merger, consolidation,
reorganization, recapitalization, stock dividend, dividend in property other
than cash, stock split, liquidating dividend, combination of shares, exchange
of shares, change in corporate structure or otherwise), the Plan and
outstanding rights will be appropriately adjusted in the class(es) and
maximum number of shares subject to the Plan and the class(es) and number of
shares and price per share of stock subject to outstanding rights.

     (b)  In the event of:  (1) a dissolution or liquidation of the Company;
(2) a merger or consolidation in which the Company is not the surviving
corporation; (3) a reverse merger in which the Company is the surviving
corporation but the shares of the Company's Common Stock outstanding
immediately preceding the merger are converted by virtue of the merger into
other property, whether in the form of securities, cash or otherwise; or (4)
any other capital reorganization in which more than fifty percent (50%) of
the shares of the Company entitled to vote are exchanged, then, as determined
by the Board in its sole discretion (i) any surviving

                                       6
<PAGE>

corporation may assume outstanding rights or substitute similar rights for
those under the Plan, (ii) such rights may continue in full force and effect,
or (iii) participants' accumulated payroll deductions may be used to purchase
Common Stock immediately prior to the transaction described above and the
participants' rights under the ongoing Offering terminated.

13.  AMENDMENT OF THE PLAN.

     (a)  The Board at any time, and from time to time, may amend the Plan.
However, except as provided in paragraph 12 relating to adjustments upon
changes in stock, no amendment shall be effective unless approved by the
stockholders of the Company within twelve (12) months before or after the
adoption of the amendment, where the amendment will:

          (i)   Increase the number of shares reserved for rights under the
Plan;

          (ii)  Modify the provisions as to eligibility for participation in
the Plan (to the extent such modification requires stockholder approval in
order for the Plan to obtain employee stock purchase plan treatment under
Section 423 of the Code or to comply with the requirements of Rule 16b-3
promulgated under the Securities Exchange Act of 1934, as amended ("Rule
16b-3")); or

          (iii) Modify the Plan in any other way if such modification
requires stockholder approval in order for the Plan to obtain employee stock
purchase plan treatment under Section 423 of the Code or to comply with the
requirements of Rule 16b-3.

It is expressly contemplated that the Board may amend the Plan in any respect
the Board deems necessary or advisable to provide eligible employees with the
maximum benefits provided or to be provided under the provisions of the Code
and the regulations promulgated thereunder relating to employee stock
purchase plans and/or to bring the Plan and/or rights granted under it into
compliance therewith.

     (b)  Rights and obligations under any rights granted before amendment of
the Plan shall not be impaired by any amendment of the Plan, except with the
consent of the person to whom such rights were granted or except as necessary
to comply with any laws or governmental regulation.

14.  DESIGNATION OF BENEFICIARY.

     (a)  A participant may file a written designation of a beneficiary who
is to receive any shares and cash, if any, from the participant's account
under the Plan in the event of such participant's death subsequent to the end
of an Offering but prior to delivery to him of such shares and cash.  In
addition, a participant may file a written designation of a beneficiary who
is to receive any cash from the participant's account under the Plan in the
event of such participant's death during an Offering.

     (b)  Such designation of beneficiary may be changed by the participant
at any time by written notice.  In the event of the death of a participant
and in the absence of a beneficiary validly designated under the Plan who is
living at the time of such participant's death, the Company shall deliver
such shares and/or cash to the executor or administrator of the estate of

                                       7
<PAGE>

the participant, or if no such executor or administrator has been appointed
(to the knowledge of the Company), the Company, in its discretion, may
deliver such shares and/or cash to the spouse or to any one or more
dependents or relatives of the participant, or if no spouse, dependent or
relative is known to the Company, then to such other person as the Company
may designate.

15.  TERMINATION OR SUSPENSION OF THE PLAN.

     (a)  The Board may suspend or terminate the Plan at any time.  No rights
may be granted under the Plan while the Plan is suspended or after it is
terminated.

     (b)  Rights and obligations under any rights granted while the Plan is
in effect shall not be impaired by suspension or termination of the Plan,
except as expressly provided in the Plan or with the consent of the person to
whom such rights were granted or except as necessary to comply with any laws
or governmental regulation.

16.  EFFECTIVE DATE OF PLAN.

     The Plan shall become effective upon the effectiveness of the Company's
initial public offering of shares of common stock, but no rights granted
under the Plan shall be exercised unless and until the Plan has been approved
by the stockholders of the Company.


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