Document:

<PAGE>   1
                                                                    EXHIBIT 4.14

                                 VIROLOGIC, INC.
                            STOCK OPTION GRANT NOTICE
                          (2000 EQUITY INCENTIVE PLAN)

VIROLOGIC, INC. (the "Company"), pursuant to its 2000 Equity Incentive Plan (the
"Plan"), hereby grants to Optionholder an option to purchase the number of
shares of the Company's Common Stock set forth below. This option is subject to
all of the terms and conditions as set forth herein and in the Stock Option
Agreement, the Plan and the Notice of Exercise, all of which are attached hereto
and incorporated herein in their entirety.

Optionholder:
Date of Grant:
                                        ---------------------------
Vesting Commencement Date:
                                        ---------------------------
Number of Shares Subject to Option:
                                        ---------------------------
Exercise Price (Per Share):
                                        ---------------------------
Total Exercise Price:
                                        ---------------------------
Expiration Date:
                                        ---------------------------

TYPE OF GRANT:      [ ] Incentive Stock Option(1)  [ ] Nonstatutory Stock Option

EXERCISE SCHEDULE:  [ ] Same as Vesting Schedule   [ ] Early Exercise Permitted

VESTING SCHEDULE:   1/24th  of the shares vest each month after the Vesting
                    Commencement Date.

PAYMENT:            By one or a combination of the following items (described in
                    the Stock Option Agreement):

                    By cash or check
                    Pursuant to a Regulation T Program if the Shares are
                    publicly traded By delivery of already-owned shares if
                    the Shares are publicly traded

ADDITIONAL TERMS/ACKNOWLEDGEMENTS: The undersigned Optionholder acknowledges
receipt of, and understands and agrees to, this Grant Notice, the Stock Option
Agreement and the Plan. Optionholder further acknowledges that as of the Date of
Grant, this Grant Notice, the Stock Option Agreement and the Plan set forth the
entire understanding between Optionholder and the Company regarding the
acquisition of stock in the Company and supersede all prior oral and written
agreements on that subject with the exception of (i) options previously granted
and delivered to Optionholder under the Plan, and (ii) the following agreements
only:

        OTHER AGREEMENTS:
                                        ---------------------------------------

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

VIROLOGIC, INC.                         OPTIONHOLDER:

By:
   -------------------------------      -------------------------------
              Signature                             Signature

Title:                                  Date:
      ----------------------------           --------------------------

Date:
     -----------------------------

ATTACHMENTS: Stock Option Agreement, 2000 Equity Incentive Plan and Notice of
Exercise

--------
(1) If this is an incentive stock option, it (plus your other outstanding
incentive stock options) cannot be first exercisable for more than $100,000 in
any calendar year. Any excess over $100,000 is a nonstatutory stock option.

<PAGE>   2
                                  ATTACHMENT I

                             STOCK OPTION AGREEMENT

<PAGE>   3
                                                                      EXHIBIT __

                                 VIROLOGIC, INC.
                           2000 EQUITY INCENTIVE PLAN

                             STOCK OPTION AGREEMENT
                   (INCENTIVE AND NONSTATUTORY STOCK OPTIONS)

        Pursuant to your Stock Option Grant Notice ("Grant Notice") and this
Stock Option Agreement, ViroLogic, Inc. (the "Company") has granted you an
option under its 2000 Equity Incentive Plan (the "Plan") to purchase the number
of shares of the Company's Common Stock indicated in your Grant Notice at the
exercise price indicated in your Grant Notice. Defined terms not explicitly
defined in this Stock Option Agreement but defined in the Plan shall have the
same definitions as in the Plan.

        The details of your option are as follows:

        1.      VESTING. Subject to the limitations contained herein, your
option will vest as provided in your Grant Notice, provided that vesting will
cease upon the termination of your Continuous Service.

        2.      NUMBER OF SHARES AND EXERCISE PRICE. The number of shares of
Common Stock subject to your option and your exercise price per share referenced
in your Grant Notice may be adjusted from time to time for Capitalization
Adjustments, as provided in the Plan.

        3.      EXERCISE PRIOR TO VESTING ("EARLY EXERCISE"). If permitted in
your Grant Notice (i.e., the "Exercise Schedule" indicates that "Early Exercise"
of your option is permitted) and subject to the provisions of your option, you
may elect at any time that is both (i) during the period of your Continuous
Service and (ii) during the term of your option, to exercise all or part of your
option, including the nonvested portion of your option; provided, however, that:

               (a) a partial exercise of your option shall be deemed to cover
first vested shares of Common Stock and then the earliest vesting installment of
unvested shares of Common Stock;

               (b) any shares of Common Stock so purchased from installments
that have not vested as of the date of exercise shall be subject to the purchase
option in favor of the Company as described in the Company's form of Early
Exercise Stock Purchase Agreement;

               (c) you shall enter into the Company's form of Early Exercise
Stock Purchase Agreement with a vesting schedule that will result in the same
vesting as if no early exercise had occurred; and

               (d) if your option is an incentive stock option, then, as
provided in the Plan, to the extent that the aggregate Fair Market Value
(determined at the time of grant) of the shares of Common Stock with respect to
which your option plus all other incentive stock options you hold are
exercisable for the first time by you during any calendar year (under all plans
of the Company and its Affiliates) exceeds one hundred thousand dollars
($100,000), your option(s) or

                                       1.

<PAGE>   4
portions thereof that exceed such limit (according to the order in which they
were granted) shall be treated as nonstatutory stock options.

        4.      METHOD OF PAYMENT. Payment of the exercise price is due in full
upon exercise of all or any part of your option. You may elect to make payment
of the exercise price in cash or by check or in any other manner PERMITTED BY
YOUR GRANT NOTICE, which may include one or more of the following:

               (a) In the Company's sole discretion at the time your option is
exercised and provided that at the time of exercise the Common Stock is publicly
traded and quoted regularly in The Wall Street Journal, pursuant to a program
developed under Regulation T as promulgated by the Federal Reserve Board that,
prior to the issuance of Common Stock, results in either the receipt of cash (or
check) by the Company or the receipt of irrevocable instructions to pay the
aggregate exercise price to the Company from the sales proceeds.

               (b) Provided that at the time of exercise the Common Stock is
publicly traded and quoted regularly in The Wall Street Journal, by delivery of
already-owned shares of Common Stock either that you have held for the period
required to avoid a charge to the Company's reported earnings (generally six
months) or that you did not acquire, directly or indirectly from the Company,
that are owned free and clear of any liens, claims, encumbrances or security
interests, and that are valued at Fair Market Value on the date of exercise.
"Delivery" for these purposes, in the sole discretion of the Company at the time
you exercise your option, shall include delivery to the Company of your
attestation of ownership of such shares of Common Stock in a form approved by
the Company. Notwithstanding the foregoing, you may not exercise your option by
tender to the Company of Common Stock to the extent such tender would violate
the provisions of any law, regulation or agreement restricting the redemption of
the Company's stock.

        5.      WHOLE SHARES. You may exercise your option only for whole shares
of Common Stock.

        6.      SECURITIES LAW COMPLIANCE. Notwithstanding anything to the
contrary contained herein, you may not exercise your option unless the shares of
Common Stock issuable upon such exercise are then registered under the
Securities Act or, if such shares of Common Stock are not then so registered,
the Company has determined that such exercise and issuance would be exempt from
the registration requirements of the Securities Act. The exercise of your option
must also comply with other applicable laws and regulations governing your
option, and you may not exercise your option if the Company determines that such
exercise would not be in material compliance with such laws and regulations.

        7.      TERM. You may not exercise your option before the commencement
of its term or after its term expires. The term of your option commences on the
Date of Grant and expires upon the EARLIEST of the following:

               (a) three (3) months after the termination of your Continuous
Service for any reason other than your Disability or death, provided that if
during any part of such three- (3-) month period your option is not exercisable
solely because of the condition set forth in the

                                       2.

<PAGE>   5
preceding paragraph relating to "Securities Law Compliance," your option shall
not expire until the earlier of the Expiration Date or until it shall have been
exercisable for an aggregate period of three (3) months after the termination of
your Continuous Service;

               (b) twelve (12) months after the termination of your Continuous
Service due to your Disability;

               (c) twelve (12) months after your death if you die either during
your Continuous Service or within three (3) months after your Continuous Service
terminates;

               (d) the Expiration Date indicated in your Grant Notice; or

               (e) the day before the tenth (10th) anniversary of the Date of
Grant.

        If your option is an incentive stock option, note that, to obtain the
federal income tax advantages associated with an "incentive stock option," the
Code requires that at all times beginning on the date of grant of your option
and ending on the day three (3) months before the date of your option's
exercise, you must be an employee of the Company or an Affiliate, except in the
event of your death or Disability. The Company has provided for extended
exercisability of your option under certain circumstances for your benefit but
cannot guarantee that your option will necessarily be treated as an "incentive
stock option" if you continue to provide services to the Company or an Affiliate
as a Consultant or Director after your employment terminates or if you otherwise
exercise your option more than three (3) months after the date your employment
terminates.

        8.      EXERCISE.

               (a) You may exercise the vested portion of your option (and the
unvested portion of your option if your Grant Notice so permits) during its term
by delivering a Notice of Exercise (in a form designated by the Company)
together with the exercise price to the Secretary of the Company, or to such
other person as the Company may designate, during regular business hours,
together with such additional documents as the Company may then require.

               (b) By exercising your option you agree that, as a condition to
any exercise of your option, the Company may require you to enter into an
arrangement providing for the payment by you to the Company of any tax
withholding obligation of the Company arising by reason of (1) the exercise of
your option, (2) the lapse of any substantial risk of forfeiture to which the
shares of Common Stock are subject at the time of exercise, or (3) the
disposition of shares of Common Stock acquired upon such exercise.

               (c) If your option is an incentive stock option, by exercising
your option you agree that you will notify the Company in writing within fifteen
(15) days after the date of any disposition of any of the shares of the Common
Stock issued upon exercise of your option that occurs within two (2) years after
the date of your option grant or within one (1) year after such shares of Common
Stock are transferred upon exercise of your option.

        9.      TRANSFERABILITY. Your option is not transferable, except by will
or by the laws of descent and distribution, and is exercisable during your life
only by you. Notwithstanding the

                                       3.

<PAGE>   6
foregoing, by delivering written notice to the Company, in a form satisfactory
to the Company, you may designate a third party who, in the event of your death,
shall thereafter be entitled to exercise your option.

        10.     OPTION NOT A SERVICE CONTRACT. Your option is not an employment
or service contract, and nothing in your option shall be deemed to create in any
way whatsoever any obligation on your part to continue in the employ of the
Company or an Affiliate, or of the Company or an Affiliate to continue your
employment. In addition, nothing in your option shall obligate the Company or an
Affiliate, their respective shareholders, Boards of Directors, Officers or
Employees to continue any relationship that you might have as a Director or
Consultant for the Company or an Affiliate.

        11.     WITHHOLDING OBLIGATIONS.

               (a) At the time you exercise your option, in whole or in part, or
at any time thereafter as requested by the Company, you hereby authorize
withholding from payroll and any other amounts payable to you, and otherwise
agree to make adequate provision for (including by means of a "cashless
exercise" pursuant to a program developed under Regulation T as promulgated by
the Federal Reserve Board to the extent permitted by the Company), any sums
required to satisfy the federal, state, local and foreign tax withholding
obligations of the Company or an Affiliate, if any, which arise in connection
with your option.

               (b) Upon your request and subject to approval by the Company, in
its sole discretion, and compliance with any applicable conditions or
restrictions of law, the Company may withhold from fully vested shares of Common
Stock otherwise issuable to you upon the exercise of your option a number of
whole shares of Common Stock having a Fair Market Value, determined by the
Company as of the date of exercise, not in excess of the minimum amount of tax
required to be withheld by law. If the date of determination of any tax
withholding obligation is deferred to a date later than the date of exercise of
your option, share withholding pursuant to the preceding sentence shall not be
permitted unless you make a proper and timely election under Section 83(b) of
the Code, covering the aggregate number of shares of Common Stock acquired upon
such exercise with respect to which such determination is otherwise deferred, to
accelerate the determination of such tax withholding obligation to the date of
exercise of your option. Notwithstanding the filing of such election, shares of
Common Stock shall be withheld solely from fully vested shares of Common Stock
determined as of the date of exercise of your option that are otherwise issuable
to you upon such exercise. Any adverse consequences to you arising in connection
with such share withholding procedure shall be your sole responsibility.

               (c) You may not exercise your option unless the tax withholding
obligations of the Company and/or any Affiliate are satisfied. Accordingly, you
may not be able to exercise your option when desired even though your option is
vested, and the Company shall have no obligation to issue a certificate for such
shares of Common Stock or release such shares of Common Stock from any escrow
provided for herein.

        12.     NOTICES. Any notices provided for in your option or the Plan
shall be given in writing and shall be deemed effectively given upon receipt or,
in the case of notices delivered by

                                       4.

<PAGE>   7
mail by the Company to you, five (5) days after deposit in the United States
mail, postage prepaid, addressed to you at the last address you provided to the
Company.

        13.     GOVERNING PLAN DOCUMENT. Your option is subject to all the
provisions of the Plan, the provisions of which are hereby made a part of your
option, and is further subject to all interpretations, amendments, rules and
regulations which may from time to time be promulgated and adopted pursuant to
the Plan. In the event of any conflict between the provisions of your option and
those of the Plan, the provisions of the Plan shall control.

                                       5.

<PAGE>   8
                                  ATTACHMENT II

                           2000 EQUITY INCENTIVE PLAN

<PAGE>   9
                                 ATTACHMENT III

                               NOTICE OF EXERCISE

<PAGE>   10

                               NOTICE OF EXERCISE

VIROLOGIC, INC.
270 EAST GRAND AVE.
SOUTH SAN FRANCISCO, CA 94080                  Date of Exercise: _______________

Ladies and Gentlemen:

        This constitutes notice under my stock option that I elect to purchase
the number of shares for the price set forth below.

<TABLE>
<S>                                         <C>                <C>
        Type of option (check one):         Incentive  [ ]     Nonstatutory  [ ]

        Stock option dated:                 _______________

        Number of shares as
        to which option is
        exercised:                          _______________

        Certificates to be
        issued in name of:                  _______________

        Total exercise price:               $______________

        Cash payment delivered
        herewith:                           $______________

        Value of ________ shares of
        ViroLogic, Inc. common
        stock delivered herewith(1):        $______________
</TABLE>

        By this exercise, I agree (i) to provide such additional documents as
you may require pursuant to the terms of the 2000 Equity Incentive Plan, (ii) to
provide for the payment by me to you (in the manner designated by you) of your
withholding obligation, if any, relating to the exercise of this option, and
(iii) if this exercise relates to an incentive stock option, to notify you in
writing within fifteen (15) days after the date of any disposition of any of the
shares of Common Stock issued upon exercise of this option that occurs within
two (2) years after the date of grant of this option or within one (1) year
after such shares of Common Stock are issued upon exercise of this option.

--------
(1)     Shares must meet the public trading requirements set forth in the
option. Shares must be valued in accordance with the terms of the option being
exercised, must have been owned for the minimum period required in the option,
and must be owned free and clear of any liens, claims, encumbrances or security
interests. Certificates must be endorsed or accompanied by an executed
assignment separate from certificate.

                                       1.

<PAGE>   11
        I further agree that, if required by the Company (or a representative of
the underwriters) in connection with the first underwritten registration of the
offering of any securities of the Company under the Securities Act, I will not
sell or otherwise transfer or dispose of any shares of Common Stock or other
securities of the Company during such period (not to exceed one hundred eighty
(180) days) following the effective date of the registration statement of the
Company filed under the Securities Act as may be requested by the Company or the
representative of the underwriters. I further agree that the Company may impose
stop-transfer instructions with respect to securities subject to the foregoing
restrictions until the end of such period.

                                           Very truly yours,

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

                                       2.<PAGE>   1
                                                                    EXHIBIT 4.15

                                 VIROLOGIC, INC.
                        2000 EMPLOYEE STOCK PURCHASE PLAN

                ADOPTED BY BOARD OF DIRECTORS FEBRUARY 21 , 2000
                 APPROVED BY STOCKHOLDERS _______________ , 2000
                             TERMINATION DATE: NONE

1.      PURPOSE.

        (a) The purpose of the Plan is to provide a means by which Employees of
the Company and certain designated Affiliates may be given an opportunity to
purchase Shares of the Company.

        (b) The Company, by means of the Plan, seeks to retain the services of
such 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 and its Affiliates.

        (c) The Company intends that the Rights to purchase Shares 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.      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) "CODE" means the United States Internal Revenue Code of 1986, as
amended.

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

        (e) "COMPANY" means ViroLogic, Inc., a Delaware corporation.

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

        (g) "ELIGIBLE EMPLOYEE" means an Employee who meets the requirements set
forth in the Offering for eligibility to participate in the Offering.

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

                                      -1-

<PAGE>   2
        (i) "EMPLOYEE STOCK PURCHASE PLAN" means a plan that grants rights
intended to be options issued under an "employee stock purchase plan," as that
term is defined in Section 423(b) of the Code.

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

        (k) "FAIR MARKET VALUE" means the value of a security, as determined in
good faith by the Board. If the security is listed on any established stock
exchange or traded on the Nasdaq National Market or the Nasdaq SmallCap Market,
then, except as otherwise provided in the Offering, the Fair Market Value of the
security shall be the closing sales price (rounded up where necessary to the
nearest whole cent) for such security (or the closing bid, if no sales were
reported) as quoted on such exchange or market (or the exchange or market with
the greatest volume of trading in the relevant security of the Company) on the
trading day prior to the relevant determination date, as reported in The Wall
Street Journal or such other source as the Board deems reliable.

        (l) "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 director" for purposes of Rule 16b-3.

        (m) "OFFERING" means the grant of Rights to purchase Shares under the
Plan to Eligible Employees.

        (n) "OFFERING DATE" means a date selected by the Board for an Offering
to commence.

        (o) "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.

        (p) "PARTICIPANT" means an Eligible Employee who holds an outstanding
Right granted pursuant to the Plan or, if applicable, such other person who
holds an outstanding Right granted under the Plan.

                                      -2-

<PAGE>   3
        (q) "PLAN" means this 2000 Employee Stock Purchase Plan.

        (r) "PURCHASE DATE" means one or more dates established by the Board
during an Offering on which Rights granted under the Plan shall be exercised and
purchases of Shares carried out in accordance with such Offering.

        (s) "RIGHT" means an option to purchase Shares granted pursuant to the
Plan.

        (t) "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 at the time discretion is
being exercised regarding the Plan.

        (u) "SECURITIES ACT" means the United States Securities Act of 1933, as
amended.

        (v) "SHARE" means a share of the common stock of the Company.

3.      ADMINISTRATION.

        (a) The Board shall administer the Plan unless and until the Board
delegates administration to a Committee, as provided in subparagraph 3(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 (or the Committee) 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 Shares 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 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 14.

               (v) Generally, to exercise such powers and to perform such acts
as it deems necessary or expedient to promote the best interests of the Company
and its Affiliates and to carry out the intent that the Plan be treated as an
Employee Stock Purchase Plan.

        (c) The Board may delegate administration of the Plan to a Committee of
the Board composed of two (2) or more members, 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

                                      -3-

<PAGE>   4
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.

4.      SHARES SUBJECT TO THE PLAN.

        (a) Subject to the provisions of paragraph 13 relating to adjustments
upon changes in securities, the Shares that may be sold pursuant to Rights
granted under the Plan shall not exceed in the aggregate five hundred thousand
(500,000) Shares. If any Right granted under the Plan shall for any reason
terminate without having been exercised, the Shares not purchased under such
Right shall again become available for the Plan.

        (b) The Shares subject to the Plan may be unissued Shares or Shares that
have been bought on the open market at prevailing market prices or otherwise.

5.      GRANT OF RIGHTS; OFFERING.

        (a) The Board may from time to time grant or provide for the grant of
Rights to purchase Shares of the Company under the Plan to Eligible Employees in
an Offering on an Offering Date or Dates selected by the Board. Each Offering
shall be in such form and shall contain such terms and conditions as the Board
shall deem appropriate, which shall comply with the requirements of Section
423(b)(5) of the Code that all Employees granted Rights to purchase Shares under
the Plan shall have the same rights and privileges. The terms and conditions of
an Offering shall be incorporated by reference into the Plan and treated as part
of the Plan. 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 document comprising 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 6 through 9, inclusive.

        (b) If a Participant has more than one Right outstanding under the Plan,
unless he or she otherwise indicates in agreements or notices delivered
hereunder: (i) each agreement or notice delivered by that Participant will be
deemed to apply to all of his or her Rights under the Plan, and (ii) an
earlier-granted Right (or a Right with a lower exercise price, if two Rights
have identical grant dates) will be exercised to the fullest possible extent
before a later-granted Right (or a Right with a higher exercise price if two
Rights have identical grant dates) will be exercised.

6.      ELIGIBILITY.

        (a) Rights may be granted only to Employees of the Company or, as the
Board may designated as provided in subparagraph 3(b), to Employees of an
Affiliate.

                                      -4-

<PAGE>   5
               (i) Except as provided in subparagraph 6(b), an Employee shall
not be eligible to be granted Rights under the Plan unless, on the Offering
Date, such Employee has been in the employ of the Company or the Affiliate, as
the case may be, for such continuous period preceding such grant as the Board
may require in the Offering, but in no event shall the required period of
continuous employment be equal to or greater than two (2) years.

               (ii) The Board may provide in an Offering that Employees whose
customary employment is twenty (20) hours or less per week shall not be eligible
to participate.

               (iii) The Board may provide in an Offering that Employees whose
customary employment is for not more than five (5) months in any calendar year
shall not be eligible to participate.

               (iv) The Board may provide in an Offering that Employees who are
highly compensated Employees within the meaning of Section 423(b)(4)(D) of the
Code shall not be eligible to participate.

        (b) The Board may provide that each person who, during the course of an
Offering, first becomes an Eligible Employee will, on a date or dates specified
in the Offering which coincides with the day on which such person becomes an
Eligible Employee or which occurs thereafter, receive a Right under that
Offering, which Right shall thereafter be deemed to be a part of that Offering.
Such Right shall have the same characteristics as any Rights originally granted
under that Offering, as described herein, except that:

               (i) the date on which such Right is granted shall be the
"Offering Date" of such Right for all purposes, including determination of the
exercise price of such Right;

               (ii) the period of the Offering with respect to such Right shall
begin on its Offering Date and end coincident with the end of such Offering; and

               (iii) the Board may provide that if such person first becomes an
Eligible Employee within a specified period of time before the end of the
Offering, he or she will not receive any Right under that 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 6(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 all Employee Stock
Purchase Plans of the Company and any Affiliates, as specified by Section
423(b)(8) of the Code, do not permit such Eligible Employee's rights to purchase
Shares of the Company or any Affiliate to accrue at a rate which

                                      -5-

<PAGE>   6
exceeds twenty five thousand dollars ($25,000) of the fair market value of such
Shares (determined at the time such Rights are granted) for each calendar year
in which such Rights are outstanding at any time.

7.      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 purchasable either:

               (i) with a percentage designated by the Board not exceeding
fifteen percent (15%) of such Employee's Earnings (as defined by the Board in
each Offering) during the period which begins on the Offering Date (or such
later date as the Board 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; or

               (ii) with a maximum dollar amount designated by the Board that,
as the Board determines for a particular Offering, (1) shall be withheld, in
whole or in part, from such Employee's Earnings (as defined by the Board in each
Offering) during the period which begins on the Offering Date (or such later
date as the Board 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 and/or (2) shall be contributed, in whole or in part, by such Employee
during such period.

        (b) The Board shall establish one or more Purchase Dates during an
Offering on which Rights granted under the Plan shall be exercised and purchases
of Shares carried out in accordance with such Offering.

        (c) In connection with each Offering made under the Plan, the Board may
specify a maximum amount of Shares that may be purchased by any Participant as
well as a maximum aggregate amount of Shares that may be purchased by all
Participants pursuant to such Offering. In addition, in connection with each
Offering that contains more than one Purchase Date, the Board may specify a
maximum aggregate amount of Shares which may be purchased by all Participants 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 amount, the Board 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.

        (d) The purchase price of Shares 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 Shares on the Offering Date; or

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

                                      -6-

<PAGE>   7
8.      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. Each such
agreement shall authorize payroll deductions of up to the maximum percentage
specified by the Board of such Employee's Earnings during the Offering (as
defined in each Offering). The payroll deductions made for each Participant
shall be credited to a bookkeeping account for such Participant under the Plan
and either may be deposited with the general funds of the Company or may be
deposited in a separate account in the name of, and for the benefit of, such
Participant with a financial institution designated by the Company. To the
extent provided in the Offering, a Participant may reduce (including to zero) or
increase such payroll deductions. To the extent provided in the Offering, a
Participant may begin such payroll deductions after the beginning of the
Offering. A Participant may make additional payments into his or her account
only if specifically provided for in the Offering and only if the Participant
has not already had the maximum permitted amount withheld during the Offering.

        (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 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 Shares for the
Participant) under the Offering, without interest unless otherwise specified in
the Offering, 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.

        (c) Rights granted pursuant to any Offering under the Plan shall
terminate immediately upon cessation of any participating Employee's employment
with the Company or a designated Affiliate for any reason (subject to any
post-employment participation period required by law) or other lack of
eligibility. 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 Shares for the terminated Employee) under
the Offering, without interest unless otherwise specified in the Offering. If
the accumulated payroll deductions have been deposited with the Company's
general funds, then the distribution shall be made from the general funds of the
Company, without interest. If the accumulated payroll deductions have been
deposited in a separate account with a financial institution as provided in
subparagraph 8(a), then the distribution shall be made from the separate
account, without interest unless otherwise specified in the Offering.

        (d) Rights granted under the Plan shall not be transferable by a
Participant otherwise than by will or the laws of descent and distribution, or
by a beneficiary designation as provided

                                      -7-

<PAGE>   8
in paragraph 15 and, otherwise during his or her lifetime, shall be exercisable
only by the person to whom such Rights are granted.

9.      EXERCISE.

        (a) On each Purchase Date specified therefor in the relevant Offering,
each Participant's accumulated payroll deductions and other additional payments
specifically provided for in the Offering (without any increase for interest)
will be applied to the purchase of Shares up to the maximum amount 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 unless specifically provided
for in the Offering.

        (b) Unless otherwise specifically provided in the Offering, the amount,
if any, of accumulated payroll deductions remaining in any Participant's account
after the purchase of Shares that is equal to the amount required to purchase
one or more whole Shares on the final Purchase Date of the Offering shall be
distributed in full to the Participant at the end of the Offering, without
interest. If the accumulated payroll deductions have been deposited with the
Company's general funds, then the distribution shall be made from the general
funds of the Company, without interest. If the accumulated payroll deductions
have been deposited in a separate account with a financial institution as
provided in subparagraph 8(a), then the distribution shall be made from the
separate account, without interest unless otherwise specified in the Offering.

        (c) No Rights granted under the Plan may be exercised to any extent
unless the Shares to be issued upon such exercise under the Plan (including
Rights granted thereunder) are covered by an effective registration statement
pursuant to 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 or in such compliance, 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 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 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 Shares) shall be distributed to the Participants, without interest
unless otherwise specified in the Offering. If the accumulated payroll
deductions have been deposited with the Company's general funds, then the
distribution shall be made from the general funds of the Company, without
interest. If the accumulated payroll deductions have been deposited in a
separate account with a financial institution as provided in subparagraph 8(a),
then the distribution shall be made from the separate account, without interest
unless otherwise specified in the Offering.

                                      -8-

<PAGE>   9
10.     COVENANTS OF THE COMPANY.

        (a) During the terms of the Rights granted under the Plan, the Company
shall ensure that the amount of Shares required to satisfy such Rights are
available.

        (b) The Company shall seek to obtain from each federal, state, foreign
or other regulatory commission or agency having jurisdiction over the Plan such
authority as may be required to issue and sell Shares 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 Shares under the Plan, the Company shall be relieved from any liability for
failure to issue and sell Shares upon exercise of such Rights unless and until
such authority is obtained.

11.     USE OF PROCEEDS FROM SHARES.

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

12.     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, Shares subject to Rights granted under
the Plan unless and until the Participant's Shares acquired upon exercise of
Rights under the Plan are recorded in the books of the Company.

13.     ADJUSTMENTS UPON CHANGES IN SECURITIES.

        (a) If any change is made in the Shares subject to the Plan, or subject
to any Right, without the receipt of consideration by the Company (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 class(es) and maximum
number of Shares subject to the Plan pursuant to subparagraph 4(a), and the
outstanding Rights will be appropriately adjusted in the class(es), number of
Shares and purchase limits of such outstanding Rights. The Board shall make such
adjustments, and its determination shall be final, binding and conclusive. (The
conversion of any convertible securities of the Company shall not be treated as
a transaction that does not involve the receipt of consideration by the
Company.)

        (b) In the event of: (i) a dissolution, liquidation, or sale of all or
substantially all of the assets of the Company; (ii) a merger or consolidation
in which the Company is not the surviving corporation; or (iii) a reverse merger
in which the Company is the surviving corporation but the Shares outstanding
immediately preceding the merger are converted by virtue of the merger into
other property, whether in the form of securities, cash or otherwise, then: (1)
any surviving or acquiring corporation shall assume Rights outstanding under the
Plan or shall substitute similar rights (including a right to acquire the same
consideration paid to Stockholders

                                      -9-

<PAGE>   10
in the transaction described in this subparagraph 13(b)) for those outstanding
under the Plan, or (2) in the event any surviving or acquiring corporation
refuses to assume such Rights or to substitute similar rights for those
outstanding under the Plan, then, as determined by the Board in its sole
discretion such Rights may continue in full force and effect or the
Participants' accumulated payroll deductions (exclusive of any accumulated
interest which cannot be applied toward the purchase of Shares under the terms
of the Offering) may be used to purchase Shares immediately prior to the
transaction described above under the ongoing Offering and the Participants'
Rights under the ongoing Offering thereafter terminated.

14.     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 13 relating to adjustments upon changes
in securities and except as to minor amendments to benefit the administration of
the Plan, to take account of a change in legislation or to obtain or maintain
favorable tax, exchange control or regulatory treatment for Participants or the
Company or any Affiliate, no amendment shall be effective unless approved by the
stockholders of the Company to the extent stockholder approval is necessary for
the Plan to satisfy the requirements of Section 423 of the Code, Rule 16b-3
under the Exchange Act and any Nasdaq or other securities exchange listing
requirements. Currently under the Code, stockholder approval within twelve (12)
months before or after the adoption of the amendment is required where the
amendment will:

               (i) Increase the amount 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; 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.

        (b) It is expressly contemplated that the Board may amend the Plan in
any respect the Board deems necessary or advisable to provide 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.

        (c) 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 regulations, or except as necessary to
ensure that the Plan and/or Rights granted under the Plan comply with the
requirements of Section 423 of the Code.

                                      -10-

<PAGE>   11
15.     DESIGNATION OF BENEFICIARY.

        (a) A Participant may file a written designation of a beneficiary who is
to receive any Shares and/or 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 the Participant 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) The Participant may change such designation of beneficiary 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 the Participant, or if no
such executor or administrator has been appointed (to the knowledge of the
Company), the Company, in its sole 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.

16.     TERMINATION OR SUSPENSION OF THE PLAN.

        (a) The Board in its discretion may suspend or terminate the Plan at any
time. Unless sooner terminated, the Plan shall terminate at the time that all of
the Shares subject to the Plan's reserve, as increased and/or adjusted from time
to time, have been issued under the terms of the Plan. 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, or except as necessary to ensure that the Plan and/or
Rights granted under the Plan comply with the requirements of Section 423 of the
Code.

17.     EFFECTIVE DATE OF PLAN.

        The Plan shall become effective as determined by the Board, but no
Rights granted under the Plan shall be exercised unless and until the Plan has
been approved by the stockholders of the Company within twelve (12) months
before or after the date the Plan is adopted by the Board, which date may be
prior to the effective date set by the Board.

                                      -11-

<PAGE>   12

                                 VIROLOGIC, INC.
                        2000 EMPLOYEE STOCK PURCHASE PLAN
                                    OFFERING

                            ADOPTED FEBRUARY 21, 2000

1.      GRANT OF RIGHTS.

        (a) The Board of Directors ("Board") of ViroLogic, Inc., a Delaware
corporation (the "Company"), pursuant to the Company's 2000 Employee Stock
Purchase Plan (the "Plan"), hereby authorizes the grant of Rights to purchase
Shares of the Company to all Eligible Employees (an "Offering"). Defined terms
not explicitly defined in this Offering but defined in the Plan shall have the
same definitions as in the Plan. In the event of any conflict between the
provisions of an Offering and those of the Plan (including interpretations,
amendments, rules and regulations that may from time to time be promulgated and
adopted pursuant to the Plan), the provisions of the Plan shall control.

        (b) An "Offering Date" is the first day of an Offering. An Offering may
consist of one purchase period or may be divided into shorter purchase periods
("Purchase Periods"). A "Purchase Date" is the last day of a Purchase Period or
the Offering, as the case may be.

        (c) Except as otherwise provided, each Offering hereunder shall be
twenty-four (24) months long and shall be divided into four (4) shorter Purchase
Periods approximately six (6) months in length. Offerings shall be consecutive.
A new Offering shall start the day after the current Offering ends.

        (d) The first Offering shall begin on the effective date of the initial
public offering of the Shares and end on January 31, 2002 (the "Initial
Offering"); provided, however, that the Initial Offering cannot exceed
twenty-seven (27) months. The Initial Offering will be divided into four (4)
shorter Purchase Periods, with the initial Purchase Period ending on July 31,
2000, the second Purchase Period ending on January 31, 2001, the third Purchase
Period ending on July 31, 2001 and the fourth Purchase Period ending on January
31, 2002.

        (e) Thereafter consecutive 24-month Offerings shall begin on February 1,
2002 and on each subsequent second anniversary of the most recent Offering Date;
provided, however, that if on the first day of a new Purchase Period during the
Offering the fair market value of the Shares is less than it was on the Offering
Date for that Offering, that day shall become the next Offering Date, and the
Offering that would otherwise have continued in effect shall immediately
terminate. Each Offering after the Initial Offering shall end on the day prior
to the second anniversary of its Offering Date unless sooner terminated as
provided above.

        (f) Prior to the commencement of any Offering, the Board may change any
or all terms of such Offering and any subsequent Offerings. The granting of
Rights pursuant to each Offering hereunder shall occur on each respective
Offering Date unless, prior to such date (i) the

                                      -1-

<PAGE>   13
Board (or such Committee) determines that such Offering shall not occur, or (ii)
no Shares remain available for issuance under the Plan in connection with the
Offering.

        (g) Notwithstanding any other provisions of an Offering, if the terms of
an Offering as previously established by the Board of Directors of the Company
would, as a result of a change to applicable accounting standards, generate a
charge to earnings, such Offering shall terminate effective as of the day prior
to the date such change to accounting standards would otherwise first apply to
the Offering (the "Offering Termination Date"), and such Offering Termination
Date shall be the final Purchase Date of such Offering. A subsequent Offering
shall commence on such date and on such terms as shall be provided by the Board
of Directors of the Company.

2.      ELIGIBLE EMPLOYEES.

        (a) All employees of the Company and each of its Affiliates incorporated
in the United States shall be granted Rights to purchase Shares under each
Offering on the Offering Date of such Offering, provided that each such employee
otherwise meets the employment requirements of subparagraph 6(a) of the Plan and
has been continuously employed for at least ten (10) days on the Offering Date
of such Offering (an "Eligible Employee"); however, the ten- (10-) day
eligibility requirement shall be waived with respect to the Initial Offering
only.

        (b) Notwithstanding the foregoing, the following employees shall not be
Eligible Employees or be granted Rights under an Offering: (i) part-time or
seasonal employees whose customary employment is twenty (20) hours or less per
week or five (5) months or less per calendar year or (ii) 5% stockholders
(including ownership through unexercised options) described in subparagraph 6(c)
of the Plan.

        (c) Notwithstanding the foregoing, each person who first becomes an
Eligible Employee during any Offering will, on the next August 1 or February 1
during that Offering, receive a Right under such Offering, which Right shall
thereafter be deemed to be a part of the Offering. Such Right shall have the
same characteristics as any Rights originally granted under the Offering except
that:

               (i) the date on which such Right is granted shall be the
"Offering Date" of such Right for all purposes, including determination of the
exercise price of such Right; and

               (ii) the Offering for such Right shall begin on its Offering Date
and end coincident with the end of the ongoing Offering.

3.      RIGHTS.

        (a) Subject to the limitations contained herein and in the Plan, on each
Offering Date each Eligible Employee shall be granted the Right to purchase the
number of Shares purchasable with up to fifteen percent (15%) of such Eligible
Employee's Earnings paid during such Offering after the Eligible Employee first
commences participation; provided, however, that no employee may purchase Shares
on a particular Purchase Date that would result in more than fifteen percent

                                      -2-

<PAGE>   14
(15%) of such employee's Earnings in the period from the Offering Date to such
Purchase Date having been applied to purchase Shares under all ongoing Offerings
under the Plan and all other Company plans intended to qualify as "employee
stock purchase plans" under Section 423 of the Internal Revenue Code of 1986, as
amended (the "Code").

        (b) For this Offering, "Earnings" means the total compensation paid to
an employee, including all salary, wages (including amounts elected to be
deferred by the employee, that would otherwise have been paid, under any cash or
deferred arrangement established by the Company), overtime pay, commissions,
bonuses, and other remuneration paid directly to the employee, but excluding
profit sharing, the cost of employee benefits paid for by the Company, education
or tuition reimbursements, imputed income arising under any Company group
insurance or benefit program, traveling expenses, business and moving expense
reimbursements, income received in connection with stock options, contributions
made by the Company under any employee benefit plan, and similar items of
compensation.

        (c) Notwithstanding the foregoing, the maximum number of Shares an
Eligible Employee may purchase on any Purchase Date in an Offering shall be such
number of Shares as has a fair market value (determined as of the Offering Date
for such Offering) equal to (x) $25,000 multiplied by the number of calendar
years in which the Right under such Offering has been outstanding at any time,
minus (y) the fair market value of any other Shares (determined as of the
relevant Offering Date with respect to such Shares) which, for purposes of the
limitation of Section 423(b)(8) of the Code, are attributed to any of such
calendar years in which the Right is outstanding. The amount in clause (y) of
the previous sentence shall be determined in accordance with regulations
applicable under Section 423(b)(8) of the Code based on (i) the number of Shares
previously purchased with respect to such calendar years pursuant to such
Offering or any other Offering under the Plan, or pursuant to any other Company
plans intended to qualify as "employee stock purchase plans" under Section 423
of the Code, and (ii) the number of Shares subject to other Rights outstanding
on the Offering Date for such Offering pursuant to the Plan or any other such
Company plan.

        (d) The maximum aggregate number of Shares available to be purchased by
all Eligible Employees under an Offering shall be the number of Shares remaining
available under the Plan on the Offering Date. If the aggregate purchase of
Shares upon exercise of Rights granted under the Offering would exceed the
maximum aggregate number of Shares available, the Board shall make a pro rata
allocation of the Shares available in a uniform and equitable manner.

4.      PURCHASE PRICE.

        (a) The purchase price of the Shares under the Offering shall be the
lesser of eighty-five percent (85%) of the fair market value of the Shares on
the Offering Date or eighty-five percent (85%) of the fair market value of the
Shares on the Purchase Date, in each case rounded up to the nearest whole cent
per Share.

        (b) For the Initial Offering, the fair market value of the Shares at the
time when the Offering commences shall be the price per Share at which Shares
are first sold to the public in

                                      -3-

<PAGE>   15
the Company's initial public offering as specified in the final prospectus with
respect to that offering.

5.      PARTICIPATION.

        (a) An Eligible Employee may elect to participate in an Offering only at
the beginning of the Offering or such later date specified in subparagraph 2(c).

        (b) A Participant who is enrolled in an Offering automatically will be
enrolled in the next Offering that commences after the current Offering ends.

        (c) An Eligible Employee shall become a Participant in an Offering by
delivering an agreement authorizing payroll deductions. Such deductions must be
in whole percentages, with a minimum percentage of one percent (1%) and a
maximum percentage of fifteen percent (15%) of Earnings. A Participant may not
make additional payments into his or her account. The agreement shall be made on
such enrollment form as the Company provides, and must be delivered to the
Company at least ten (10) days before the Offering Date, or before such later
date specified in subparagraph 2(c), in advance of the date of participation to
be effective, unless a later time for filing the enrollment form is set by the
Board for all Eligible Employees with respect to a given Offering Date. For the
Initial Offering, the time for filing an enrollment form and commencing
participation for individuals who are Eligible Employees on the Offering Date
for the Initial Offering may be after the Offering Date, as determined by the
Company and communicated to such Eligible Employees.

        (d) If the agreement authorizing payroll deductions is required to be
delivered to the Company or designated Affiliate a specified number of days
before the Offering Date to be effective, then an employee who becomes eligible
during the required delivery period shall not be considered to be an Eligible
Employee at the beginning of the Offering but may elect to participate during
the Offering as provided in subparagraph 2(c).

6.      CHANGING PARTICIPATION LEVEL DURING OFFERING; WITHDRAWAL FROM OFFERING.

        (a) A Participant may not increase his or her deductions during the
course of a Purchase Period. A Participant may increase or decrease his or her
deductions prior to the beginning of a new Purchase Period or a new Offering, to
be effective at the beginning of such new Purchase Period or new Offering. A
Participant shall make a change in the his or her participation level by
delivering a notice to the Company in such form as the Company provides and up
to ten (10) days before the start of such new Purchase Period or new Offering
(or such shorter period of time determined by the Company and communicated to
Participants).

        (b) A Participant may reduce (including to zero) his or her deductions
once (and only once) during a Purchase Period, effective as soon as
administratively practicable. A Participant shall make a change in the his or
her participation level by delivering a notice to the Company in such form as
the Company provides up to ten (10) days before the end of such Purchase Period
(or such shorter period of time determined by the Company and communicated to
Participants).

                                      -4-

<PAGE>   16
        (c) Except as otherwise specifically provided herein, a Participant may
not increase or decrease his or her participation level during the course of an
Offering.

        (d) Notwithstanding the foregoing, a Participant may withdraw from an
Offering and receive his or her accumulated payroll deductions from the Offering
(reduced to the extent, if any, such deductions have been used to acquire Shares
for the Participant on any prior Purchase Dates), without interest, or reduce
his or her participation percentage to zero (0), at any time prior to the end of
the Offering, excluding only each ten (10) day period immediately preceding a
Purchase Date (or such shorter period of time determined by the Company and
communicated to Participants) by delivering a withdrawal notice to the Company
in such form as the Company provides.

7.      PURCHASES.

        Subject to the limitations contained herein, on each Purchase Date, each
Participant's accumulated payroll deductions (without any increase for interest)
shall be applied to the purchase of whole Shares, up to the maximum number of
Shares permitted under the Plan and the Offering.

8.      NOTICES AND AGREEMENTS.

        Any notices or agreements provided for in an Offering or the Plan shall
be given in writing, in a form provided by the Company, and unless specifically
provided for in the Plan or this Offering shall be deemed effectively given upon
receipt or, in the case of notices and agreements delivered by the Company, five
(5) days after deposit in the United States mail, postage prepaid.

9.      EXERCISE CONTINGENT ON STOCKHOLDER APPROVAL.

        The Rights granted under an Offering are subject to the approval of the
Plan by the Shareholders as required for the Plan to obtain treatment as a
tax-qualified employee stock purchase plan under Section 423 of the Code.

10.     OFFERING SUBJECT TO PLAN.

        Each Offering is subject to all the provisions of the Plan, and its
provisions are hereby made a part of the Offering, and is further subject to all
interpretations, amendments, rules and regulations which may from time to time
be promulgated and adopted pursuant to the Plan.

                                      -5-

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