Document:

Exhibit 10.4

  

  
     

    

    Castle Biosciences, Inc.

     

    2018 Equity Incentive Plan

     

    Adopted by the Board of Directors:  August 15, 2018

    Approved by the Stockholders:  October 3,  2018

    Amendment Approved by the Board of Directors:  July 11, 2019

    Amendment Approved by the Stockholders: July 11, 2019

    Termination Date:  August 14, 2028

     

    1.           General.

     

    (a)          Successor to and Continuation of Prior Plan. The Plan is intended as the successor
      to and continuation of the Castle Biosciences, Inc. 2008 Stock Plan, as amended (the “Prior Plan”).  Following the Effective Date, no additional stock awards will be granted under the Prior
      Plan.  All Awards granted on or after 12:01 a.m. Eastern Time on the Effective Date will be granted under this Plan.  All stock awards granted under the Prior Plan will remain subject to the terms of the Prior Plan.

     

    (i)          Any shares that would otherwise remain available for future grants under the Prior Plan as of 12:01 a.m. Eastern Time on the Effective Date (the “Prior Plan’s Available Reserve”) will cease to be available under the Prior Plan at such time.  Instead, that number of shares of Common Stock equal to the Prior Plan’s Available Reserve will be
      added to the Share Reserve (as further described in Section 3(a) below) and will be immediately available for grants and issuance pursuant to Stock Awards hereunder, up to the maximum number set forth in Section 3(a) below.

     

    (ii)         In addition, from and after 12:01 a.m. Eastern Time on the Effective Date, any shares subject, at such time, to outstanding stock awards granted
      under the Prior Plan that (i) expire or terminate for any reason prior to exercise or settlement; (ii) are forfeited because of the failure to meet a contingency or condition required to vest such shares or otherwise return to the Company; or (iii)
      are reacquired, withheld (or not issued) to satisfy a tax withholding obligation in connection with an award or to satisfy the purchase price or exercise price of a stock award (such shares the “Returning

        Shares”) will immediately be added to the Share Reserve (as further described in Section 3(a) below) as and when such shares become Returning Shares, up to the maximum number set forth in Section 3(a) below.

     

    (b)          Eligible Stock Award Recipients.  Employees, Directors and Consultants are eligible to receive Stock
      Awards.

     

    (c)          Available Stock Awards.  The Plan provides for the grant of the following types of Stock Awards: (i)
      Incentive Stock Options, (ii) Nonstatutory Stock Options, (iii) Stock Appreciation Rights, (iv) Restricted Stock Awards, (v) Restricted Stock Unit Awards and (vi) Other Stock Awards.

     

    
      

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    (d)          Purpose.  The Plan, through the granting of Stock Awards, is intended to help the Company secure and
      retain the services of eligible award recipients, provide incentives for such persons to exert maximum efforts for the success of the Company and any Affiliate and provide a means by which the eligible recipients may benefit from increases in value
      of the Common Stock.

     

    2.           Administration.

     

    (a)          Administration by Board.  The Board will administer the Plan.  The Board may delegate administration of
      the Plan to a Committee or Committees, as provided in Section 2(c).

     

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

     

    (i)          To determine (A) who will be granted Stock Awards; (B) when and how each Stock Award will be granted; (C) what type of Stock Award will be
      granted; (D) the provisions of each Stock Award (which need not be identical), including when a person will be permitted to exercise or otherwise receive cash or Common Stock under the Stock Award; (E) the number of shares of Common Stock subject to
      a Stock Award; and (F) the Fair Market Value applicable to a Stock Award.

     

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

     

    (iii)         To settle all controversies regarding the Plan and Stock Awards granted under it.

     

    (iv)         To accelerate, in whole or in part, the time at which a Stock Award may be exercised or vest (or at which cash or shares of Common Stock may be
      issued).

     

    (v)          To suspend or terminate the Plan at any time.  Except as otherwise provided in the Plan or a Stock Award Agreement, suspension or termination of
      the Plan will not impair a Participant’s rights under his or her then-outstanding Stock Award without his or her written consent except as provided in subsection (viii) below.

     

    (vi)        To amend the Plan in any respect the Board deems necessary or advisable, including, without limitation, by adopting amendments relating to
      Incentive Stock Options and certain nonqualified deferred compensation under Section 409A of the Code and/or to make the Plan or Stock Awards granted under the Plan compliant with the requirements for Incentive Stock Options or exempt from or
      compliant with the requirements for nonqualified deferred compensation under Section 409A of the Code, subject to the limitations, if any, of applicable law. However, if required by applicable law, and except as provided in Section 9(a) relating to
      Capitalization Adjustments, the Company will seek stockholder approval of any amendment of the Plan that (A) materially increases the number of shares of Common Stock available for issuance under the Plan, (B) materially expands the class of
      individuals eligible to receive Stock Awards under the Plan, (C) materially increases the benefits accruing to Participants under the Plan, (D) materially reduces the price at which shares of Common Stock may be issued or purchased under the Plan,
      (E) materially extends the term of the Plan, or (F) materially expands the types of Stock Awards available for issuance under the Plan.  Except as provided in the Plan (including subsection (viii) below) or a Stock Award Agreement, no amendment of
      the Plan will impair a Participant’s rights under an outstanding Stock Award unless (1) the Company requests the consent of the affected Participant, and (2) such Participant consents in writing.

     

    
      

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    (vii)        To submit any amendment to the Plan for stockholder approval, including, but not limited to, amendments to the Plan intended to satisfy the
      requirements of Section 422 of the Code regarding Incentive Stock Options.

     

    (viii)       To approve forms of Stock Award Agreements for use under the Plan and to amend the terms of any one or more Stock Awards, including, but not
      limited to, amendments to provide terms more favorable to the Participant than previously provided in the Stock Award Agreement, subject to any specified limits in the Plan that are not subject to Board discretion; provided

        however, that a Participant’s rights under any Stock Award will not be impaired by any such amendment unless (A) the Company requests the consent of the affected Participant, and (B) such Participant consents in writing.  Notwithstanding the
      foregoing, (1) a Participant’s rights will not be deemed to have been impaired by any such amendment if the Board, in its sole discretion, determines that the amendment, taken as a whole, does not materially impair the Participant’s rights, and (2)
      subject to the limitations of applicable law, if any, the Board may amend the terms of any one or more Stock Awards without the affected Participant’s consent (A) to maintain the qualified status of the Stock Award as an Incentive Stock Option under
      Section 422 of the Code; (B) to change the terms of an Incentive Stock Option, if such change results in impairment of the Stock Award solely because it impairs the qualified status of the Stock Award as an Incentive Stock Option under Section 422 of
      the Code; (C) to clarify the manner of exemption from, or to bring the Stock Award into compliance with, Section 409A of the Code; or (D) to comply with other applicable laws.

     

    (ix)         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 that are not in conflict with the provisions of the Plan or Stock Awards.

     

    (x)         To adopt such procedures and sub-plans as are necessary or appropriate to permit participation in the Plan by Employees, Directors or Consultants
      who are foreign nationals or employed outside the United States (provided that Board approval will not be necessary for immaterial modifications to the Plan or any Stock Award Agreement that are required for compliance with the laws of the relevant
      foreign jurisdiction).

     

    (xi)         To effect, with the consent of any adversely affected Participant, (A) the reduction of the exercise, purchase or strike price of any outstanding
      Stock Award; (B) the cancellation of any outstanding Stock Award and the grant in substitution therefor of a new (1) Option or SAR, (2) Restricted Stock Award, (3) Restricted Stock Unit Award, (4) Other Stock Award, (5) cash and/or (6) other valuable
      consideration determined by the Board, in its sole discretion, with any such substituted award (x) covering the same or a different number of shares of Common Stock as the cancelled Stock Award and (y) granted under the Plan or another equity or
      compensatory plan of the Company; or (C) any other action that is treated as a repricing under generally accepted accounting principles.

     

    
      

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    (c)          Delegation to Committee.  The Board may delegate some or all of the administration of the Plan to a
      Committee or Committees, subject to any parameters specified by the Board.  If administration of the Plan is delegated to a Committee, the Committee will have, in connection with the administration of the Plan, the powers theretofore possessed by the
      Board that have been delegated to the Committee, including the power to delegate to a subcommittee of the Committee any of the administrative powers the Committee is authorized to exercise (and references in this Plan to the Board will thereafter be
      to the Committee or subcommittee).  Any delegation of administrative powers will be reflected in resolutions, not inconsistent with the provisions of the Plan, adopted from time to time by the Board or Committee (as applicable).  The Committee may,
      at any time, abolish the subcommittee and/or revest in the Committee any powers delegated to the subcommittee.  The Board may retain the authority to concurrently administer the Plan with the Committee and may, at any time, revest in the Board some
      or all of the powers previously delegated.

     

    (d)          Delegation to an Officer.  The Board may delegate to one (1) or more Officers the authority to do one or
      both of the following: (i) designate Employees who are not Officers to be recipients of Options and SARs (and, to the extent permitted by applicable law, other Stock Awards) and, to the extent permitted by applicable law, the terms of such Stock
      Awards, and (ii) determine the number of shares of Common Stock to be subject to such Stock Awards granted to such Employees; provided, however, that the Board resolutions regarding such delegation will specify the total number of shares of Common
      Stock that may be subject to the Stock Awards granted by such Officer and that such Officer may not grant a Stock Award to himself or herself.  Any such Stock Awards will be granted on the form of Stock Award Agreement most recently approved for use
      by the Committee or the Board, unless otherwise provided in the resolutions approving the delegation authority.  The Board may not delegate authority to an Officer who is acting solely in the capacity of an Officer (and not also as a Director) to
      determine the Fair Market Value pursuant to Section 13(u) below.

     

    (e)           Effect of Board’s Decision. All determinations, interpretations and constructions made by the Board in
      good faith will not be subject to review by any person and will be final, binding and conclusive on all persons.

     

    3.           Shares Subject to the Plan.

     

    (a)          Share Reserve.

     

    (i)          Subject to Section 9(a) relating to Capitalization Adjustments, the aggregate number of shares of Common Stock that may be issued pursuant to
      Stock Awards from and after the Effective Date will not exceed a maximum of 853,214 shares (the “Share Reserve”), which number is the sum of (i) 676,607 new shares plus (ii) 176,607 shares subject to the Prior Plan’s Available Reserve. The Share Reserve may be increased by up to 1,904,637 shares that are Returning Shares, as such shares become
      available from time to time, with such additional shares becoming part of the Share Reserve.

     

    
      

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    (ii)          For clarity, the Share Reserve in this Section 3(a) is a limitation on the number of shares of Common Stock that may be issued pursuant to the
      Plan.  Accordingly, this Section 3(a) does not limit the granting of Stock Awards except as provided in Section 7(a).

     

    (b)          Reversion of Shares to the Share Reserve.  If a Stock Award or any portion thereof (i) expires or
      otherwise terminates without all of the shares covered by such Stock Award having been issued or (ii) is settled in cash (i.e., the Participant receives cash rather than stock), such expiration, termination or
      settlement will not reduce (or otherwise offset) the number of shares of Common Stock that may be available for issuance under the Plan.  If any shares of Common Stock issued pursuant to a Stock Award are forfeited back to or repurchased or
      reacquired by the Company for any reason, including because of the failure to meet a contingency or condition required to vest such shares in the Participant, then the shares that are forfeited, reacquired or repurchased will revert to and again
      become available for issuance under the Plan.  For the avoidance of doubt, any shares reacquired by the Company in satisfaction of tax withholding obligations on a Stock Award or as consideration for the exercise or purchase price of a Stock Award
      will again become available for issuance under the Plan.

     

    (c)          Incentive Stock Option Limit.  Subject to the Share Reserve and Section 9(a) relating to Capitalization
      Adjustments, the aggregate maximum number of shares of Common Stock that may be issued pursuant to the exercise of Incentive Stock Options will be 5,162,488  shares of Common Stock.

     

    (d)          Source of Shares.  The stock issuable under the Plan will be shares of authorized but unissued or
      reacquired Common Stock, including shares repurchased by the Company on the open market or otherwise.

     

    4.           Eligibility.

     

    (a)          Eligibility for Specific Stock Awards.  Incentive Stock Options may be granted only to employees of the
      Company or a “parent corporation” or “subsidiary corporation” thereof (as such terms are defined in Sections 424(e) and 424(f) of the Code).  Stock Awards other than Incentive Stock Options may be granted to Employees, Directors and Consultants; provided, however, that Stock Awards may not be granted to Employees, Directors and Consultants who are providing Continuous Service only to any “parent” of the Company, as such term is defined in Rule 405, unless
      (i) the stock underlying such Stock Awards is treated as “service recipient stock” under Section 409A of the Code (for example, because the Stock Awards are granted pursuant to a corporate transaction such as a spin off transaction), or (ii) the
      Company, in consultation with its legal counsel, has determined that such Stock Awards are otherwise exempt from or alternatively comply with the distribution requirements of Section 409A of the Code.

     

    (b)          Ten Percent Stockholders.  A Ten Percent Stockholder will not be granted an Incentive Stock Option unless
      the exercise price of such Option is at least one hundred ten percent (110%) of the Fair Market Value on the date of grant and the Option is not exercisable after the expiration of five (5) years from the date of grant.

     

    
      

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    (c)          Consultants.   A Consultant will not be eligible for the grant of a Stock Award if, at the time of grant,
      either the offer or sale of the Company’s securities to such Consultant is not exempt under Rule 701 because of the nature of the services that the Consultant is providing to the Company, because the Consultant is not a natural person, or because of
      any other provision of Rule 701, unless the Company determines that such grant need not comply with the requirements of Rule 701 and will satisfy another exemption under the Securities Act as well as comply with the securities laws of all other
      relevant jurisdictions.

     

    5.           Provisions Relating to Options and Stock Appreciation Rights.

     

    Each Option or SAR will be in such form and will contain such terms and conditions as the Board deems appropriate.  All Options will be separately designated Incentive Stock Options or Nonstatutory
      Stock Options at the time of grant, and, if certificates are issued, a separate certificate or certificates will be issued for shares of Common Stock purchased on exercise of each type of Option.  If an Option is not specifically designated as an
      Incentive Stock Option, or if an Option is designated as an Incentive Stock Option but some portion or all of the Option fails to qualify as an Incentive Stock Option under the applicable rules, then the Option (or portion thereof) will be a
      Nonstatutory Stock Option. The provisions of separate Options or SARs need not be identical; provided, however, that each Stock Award Agreement will conform to (through incorporation of provisions hereof by
      reference in the applicable Stock Award Agreement or otherwise) the substance of each of the following provisions:

     

    (a)          Term.  Subject to the provisions of Section 4(b) regarding Ten Percent Stockholders, no Option or SAR will
      be exercisable after the expiration of ten (10) years from the date of its grant or such shorter period specified in the Stock Award Agreement.

     

    (b)          Exercise Price.  Subject to the provisions of Section  4(b) regarding Ten Percent Stockholders, the
      exercise or strike price of each Option or SAR will be not less than one hundred percent (100%) of the Fair Market Value of the Common Stock subject to the Option or SAR on the date the Stock Award is granted.  Notwithstanding the foregoing, an
      Option or SAR may be granted with an exercise or strike price lower than one hundred percent (100%) of the Fair Market Value of the Common Stock subject to the Stock Award if such Stock Award is granted pursuant to an assumption of or substitution
      for another option or stock appreciation right pursuant to a Corporate Transaction and in a manner consistent with the provisions of Section 409A of the Code and, if applicable, Section 424(a) of the Code.  Each SAR will be denominated in shares of
      Common Stock equivalents.

     

    (c)          Purchase Price for Options.  The purchase price of Common Stock acquired pursuant to the exercise of an
      Option may be paid, to the extent permitted by applicable law and as determined by the Board in its sole discretion, by any combination of the methods of payment set forth below.  The Board will have the authority to grant Options that do not permit
      all of the following methods of payment (or otherwise restrict the ability to use certain methods) and to grant Options that require the consent of the Company to use a particular method of payment.  The permitted methods of payment are as follows:

     

    
      

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    (i)           by cash, check, bank draft or money order payable to the Company;

     

    (ii)         pursuant to a program developed under Regulation T as promulgated by the Federal Reserve Board that, prior to the issuance of the stock subject to
      the Option, 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;

     

    (iii)         by delivery to the Company (either by actual delivery or attestation) of shares of Common Stock;

     

    (iv)         if an Option is a Nonstatutory Stock Option, by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of
      Common Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed the aggregate exercise price; provided, however, that the Company will accept a cash or other payment from the Participant to the
      extent of any remaining balance of the aggregate exercise price not satisfied by such reduction in the number of whole shares to be issued.  Shares of Common Stock will no longer be subject to an Option and will not be exercisable thereafter to the
      extent that (A) shares issuable upon exercise are used to pay the exercise price pursuant to the “net exercise,” (B) shares are delivered to the Participant as a result of such exercise, and (C) shares are withheld to satisfy tax withholding
      obligations;

     

    (v)          according to a deferred payment or similar arrangement with the Optionholder; provided, however, that
      interest will compound at least annually and will be charged at the minimum rate of interest necessary to avoid (A) the imputation of interest income to the Company and compensation income to the Optionholder under any applicable provisions of the
      Code, and (B) the classification of the Option as a liability for financial accounting purposes; or

     

    (vi)         in any other form of legal consideration that may be acceptable to the Board and specified in the applicable Stock Award Agreement.

     

    (d)          Exercise and Payment of a SAR.  To exercise any outstanding SAR, the Participant must provide written
      notice of exercise to the Company in compliance with the provisions of the Stock Award Agreement evidencing such SAR.  The appreciation distribution payable on the exercise of a SAR will 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 SAR) of a number of shares of Common Stock equal to the number of Common Stock equivalents in which the Participant is vested under such SAR, and with respect to which the Participant is
      exercising the SAR on such date, over (B) the aggregate strike price of the number of Common Stock equivalents with respect to which the Participant is exercising the SAR on such date.  The appreciation distribution may be paid in Common Stock, in
      cash, in any combination of the two or in any other form of consideration, as determined by the Board and contained in the Stock Award Agreement evidencing such SAR.

     

    
      

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    (e)          Transferability of Options and SARs.  The Board may, in its sole discretion, impose such limitations on
      the transferability of Options and SARs as the Board will determine.  In the absence of such a determination by the Board to the contrary, the following restrictions on the transferability of Options and SARs will apply:

     

    (i)          Restrictions on Transfer.  An Option or SAR will not be transferable except by will or by the laws of
      descent and distribution (and pursuant to subsections (ii) and (iii) below), and will be exercisable during the lifetime of the Participant only by the Participant.  The Board may permit transfer of the Option or SAR in a manner that is not
      prohibited by applicable tax and securities laws. Except as explicitly provided herein, neither an Option nor a SAR may be transferred for consideration.

     

    (ii)          Domestic Relations Orders.  Subject to the approval of the Board or a duly authorized Officer, an Option
      or SAR may be transferred pursuant to the terms of a domestic relations order, official marital settlement agreement or other divorce or separation instrument as permitted by Treasury Regulation 1.421-1(b)(2).  If an Option is an Incentive Stock
      Option, such Option may be deemed to be a Nonstatutory Stock Option as a result of such transfer.

     

    (iii)          Beneficiary Designation.  Subject to the approval of the Board or a duly authorized Officer, a
      Participant may, by delivering written notice to the Company, in a form approved by the Company (or the designated broker), designate a third party who, upon the death of the Participant, will thereafter be entitled to exercise the Option or SAR and
      receive the Common Stock or other consideration resulting from such exercise.  In the absence of such a designation, upon the death of the Participant, the executor or administrator of the Participant’s estate will be entitled to exercise the Option
      or SAR and receive the Common Stock or other consideration resulting from such exercise.  However, the Company may prohibit designation of a beneficiary at any time, including due to any conclusion by the Company that such designation would be
      inconsistent with the provisions of applicable laws.

     

    (f)           Vesting Generally.  The total number of shares of Common Stock subject to an Option or SAR may vest and
      become exercisable in periodic installments that may or may not be equal.  The Option or SAR may be subject to such other terms and conditions on the time or times when it may or may not be exercised (which may be based on the satisfaction of
      performance goals or other criteria) as the Board may deem appropriate.  The vesting provisions of individual Options or SARs may vary.  The provisions of this Section 5(f) are subject to any Option or SAR provisions governing the minimum number of
      shares of Common Stock as to which an Option or SAR may be exercised.

     

    (g)          Termination of Continuous Service.  Except as otherwise provided in the applicable Stock Award Agreement
      or other agreement between the Participant and the Company, if a Participant’s Continuous Service terminates (other than for Cause and other than upon the Participant’s death or Disability), the Participant may exercise his or her Option or SAR (to
      the extent that the Participant was entitled to exercise such Stock Award as of the date of termination of Continuous Service) within the period of time ending on the earlier of (i) the date three (3) months following the termination of the
      Participant’s Continuous Service (or such longer or shorter period specified in the applicable Stock Award Agreement, which period will not be less than thirty (30) days if necessary to comply with applicable laws unless such termination is for
      Cause) and (ii) the expiration of the term of the Option or SAR as set forth in the Stock Award Agreement.  If, after termination of Continuous Service, the Participant does not exercise his or her Option or SAR within the applicable time frame, the
      Option or SAR (as applicable) will terminate.

     

    
      

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    (h)          Extension of Termination Date.  Except as otherwise provided in the applicable Stock Award Agreement or
      other agreement between the Participant and the Company, if the exercise of an Option or SAR following the termination of the Participant’s Continuous Service (other than for Cause and other than upon the Participant’s death or Disability) would be
      prohibited at any time solely because the issuance of shares of Common Stock would violate the registration requirements under the Securities Act, then the Option or SAR will terminate on the earlier of (i) the expiration of a total period of time
      (that need not be consecutive) equal to the applicable post termination exercise period after the termination of the Participant’s Continuous Service during which the exercise of the Option or SAR would not be in violation of such registration
      requirements, or (ii) the expiration of the term of the Option or SAR as set forth in the applicable Stock Award Agreement.  In addition, unless otherwise provided in a Participant’s Stock Award Agreement, if the sale of any Common Stock received
      upon exercise of an Option or SAR following the termination of the Participant’s Continuous Service (other than for Cause) would violate the Company’s insider trading policy, then the Option or SAR will terminate on the earlier of (i) the expiration
      of a period of time (that need not be consecutive) equal to the applicable post-termination exercise period after the termination of the Participant’s Continuous Service during which the sale of the Common Stock received upon exercise of the Option
      or SAR would not be in violation of the Company’s insider trading policy, or (ii) the expiration of the term of the Option or SAR as set forth in the applicable Stock Award Agreement.

     

    (i)           Disability of Participant.  Except as otherwise provided in the applicable Stock Award Agreement or
      other agreement between the Participant and the Company, if a Participant’s Continuous Service terminates as a result of the Participant’s Disability, the Participant may exercise his or her Option or SAR (to the extent that the Participant was
      entitled to exercise such Option or SAR as of the date of termination of Continuous Service), but only within such period of time ending on the earlier of (i) the date twelve (12) months following such termination of Continuous Service (or such
      longer or shorter period specified in the Stock Award Agreement, which period will not be less than six (6) months if necessary to comply with applicable laws), and (ii) the expiration of the term of the Option or SAR as set forth in the Stock Award
      Agreement.  If, after termination of Continuous Service, the Participant does not exercise his or her Option or SAR within the applicable time frame, the Option or SAR (as applicable) will terminate.

     

    
      

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    (j)          Death of Participant.  Except as otherwise provided in the applicable Stock Award Agreement or other
      agreement between the Participant and the Company, if (i) a Participant’s Continuous Service terminates as a result of the Participant’s death, or (ii) the Participant dies within the period (if any) specified in the Stock Award Agreement for
      exercisability after the termination of the Participant’s Continuous Service (for a reason other than death), then the Option or SAR may be exercised (to the extent the Participant was entitled to exercise such Option or SAR as of the date of death)
      by the Participant’s estate, by a person who acquired the right to exercise the Option or SAR by bequest or inheritance or by a person designated to exercise the Option or SAR upon the Participant’s death, 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 specified in the Stock Award Agreement, which period will
      not be less than six (6) months if necessary to comply with applicable laws), and (ii) the expiration of the term of such Option or SAR as set forth in the Stock Award Agreement.  If, after the Participant’s death, the Option or SAR is not exercised
      within the applicable time frame, the Option or SAR (as applicable) will terminate.

     

    (k)          Termination for Cause.  Except as explicitly provided otherwise in a Participant’s Stock Award Agreement
      or other individual written agreement between the Company or any Affiliate and the Participant, if a Participant’s Continuous Service is terminated for Cause, the Option or SAR will terminate immediately upon such Participant’s termination of
      Continuous Service, and the Participant will be prohibited from exercising his or her Option or SAR from and after the time of such termination of Continuous Service.

     

    (l)           Non-Exempt Employees.  If an Option or SAR is granted to an Employee who is a non-exempt employee for
      purposes of the Fair Labor Standards Act of 1938, as amended, the Option or SAR will not be first exercisable for any shares of Common Stock until at least six (6) months following the date of grant of the Option or SAR (although the Stock Award may
      vest prior to such date).  Consistent with the provisions of the Worker Economic Opportunity Act, (i) if such non-exempt Employee dies or suffers a Disability, (ii) upon a Corporate Transaction in which such Option or SAR is not assumed, continued,
      or substituted, (iii) upon a Change in Control, or (iv) upon the Participant’s retirement (as such term may be defined in the Participant’s Stock Award Agreement, in another agreement between the Participant and the Company, or, if no such
      definition, in accordance with the Company’s then current employment policies and guidelines), the vested portion of any Options and SARs may be exercised earlier than six (6) months following the date of grant.  The foregoing provision is intended
      to operate so that any income derived by a non-exempt employee in connection with the exercise or vesting of an Option or SAR will be exempt from his or her regular rate of pay. To the extent permitted and/or required for compliance with the Worker
      Economic Opportunity Act to ensure that any income derived by a non-exempt employee in connection with the exercise, vesting or issuance of any shares under any other Stock Award will be exempt from the employee’s regular rate of pay, the provisions
      of this Section 5(l) will apply to all Stock Awards and are hereby incorporated by reference into such Stock Award Agreements.

     

    (m)          Early Exercise of Options.  An Option may, but need not, include a provision whereby the Optionholder may
      elect at any time before the Optionholder’s Continuous Service terminates to exercise the Option as to any part or all of the shares of Common Stock subject to the Option prior to the full vesting of the Option.  Subject to the “Repurchase
      Limitation” in Section 8(l), any unvested shares of Common Stock so purchased may be subject to a repurchase right in favor of the Company or to any other restriction the Board determines to be appropriate.  Provided that the “Repurchase Limitation”
      in Section 8(l) is not violated, the Company will not be required to exercise its repurchase right until at least six (6) months (or such longer or shorter period of time required to avoid classification of the Option as a liability for financial
      accounting purposes) have elapsed following exercise of the Option unless the Board otherwise specifically provides in the Option Agreement.

     

    
      

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    (n)          Right of Repurchase.  Subject to the “Repurchase Limitation” in Section 8(l), the Option or SAR may
      include a provision whereby the Company may elect to repurchase all or any part of the vested shares of Common Stock acquired by the Participant pursuant to the exercise of the Option or SAR.

     

    (o)          Right of First Refusal.  The Option or SAR may include a provision whereby the Company may elect to
      exercise a right of first refusal following receipt of notice from the Participant of the intent to transfer all or any part of the shares of Common Stock received upon the exercise of the Option or SAR.  Such right of first refusal will be subject
      to the “Repurchase Limitation” in Section 8(l).  Except as expressly provided in this Section 5(o) or in the Stock Award Agreement, such right of first refusal will otherwise comply with any applicable provisions of the bylaws of the Company.

     

    6.           Provisions of Stock Awards Other than Options and SARs.

     

    (a)          Restricted Stock Awards.  Each Restricted Stock Award Agreement will be in such form and will contain such
      terms and conditions as the Board deems appropriate.  To the extent consistent with the Company’s bylaws, at the Board’s election, shares of Common Stock underlying a Restricted Stock Award may be (i) held in book entry form subject to the Company’s
      instructions until any restrictions relating to the Restricted Stock Award lapse; or (ii) evidenced by a certificate, which certificate will be held in such form and manner as determined by the Board.  The terms and conditions of Restricted Stock
      Award Agreements may change from time to time, and the terms and conditions of separate Restricted Stock Award Agreements need not be identical.  Each Restricted Stock Award Agreement will conform to (through incorporation of the provisions hereof by
      reference in the agreement or otherwise) the substance of each of the following provisions:

     

    (i)          Consideration. A Restricted Stock Award may be awarded in consideration for (A) cash, check, bank draft or
      money order payable to the Company, (B) past services to the Company or an Affiliate, or (C) any other form of legal consideration (including future services) that may be acceptable to
      the Board, in its sole discretion, and permissible under applicable law.

     

    (ii)          Vesting.  Subject to the “Repurchase Limitation” in Section 8(l), shares of Common Stock awarded under
      the Restricted Stock Award Agreement may be subject to forfeiture to the Company in accordance with a vesting schedule to be determined by the Board.

     

    (iii)         Termination of Participant’s Continuous Service.  If a Participant’s Continuous Service terminates, the
      Company may receive through a forfeiture condition or a repurchase right, any or all of the shares of Common Stock held by the Participant as of the date of termination of Continuous Service under the terms of the Restricted Stock Award Agreement.

     

    
      

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    (iv)         Transferability.  Rights to acquire shares of Common Stock under the Restricted Stock Award Agreement
      will be transferable by the Participant only upon such terms and conditions as are set forth in the Restricted Stock Award Agreement, as the Board will determine in its sole discretion, so long as Common Stock awarded under the Restricted Stock Award
      Agreement remains subject to the terms of the Restricted Stock Award Agreement.

     

    (v)          Dividends.  A Restricted Stock Award Agreement may provide that any dividends paid on Restricted Stock
      will be subject to the same vesting and forfeiture restrictions as apply to the shares subject to the Restricted Stock Award to which they relate.

     

    (b)          Restricted Stock Unit Awards.  Each Restricted Stock Unit Award Agreement will be in such form and will
      contain such terms and conditions as the Board deems appropriate.  The terms and conditions of Restricted Stock Unit Award Agreements may change from time to time, and the terms and conditions of separate Restricted Stock Unit Award Agreements need
      not be identical.  Each Restricted Stock Unit Award Agreement will conform to (through incorporation of the provisions hereof by reference in the Agreement or otherwise) the substance of each of the following provisions:

     

    (i)          Consideration.  At the time of grant of a Restricted Stock Unit Award, the Board will determine the
      consideration, if any, to be paid by the Participant upon delivery of each share of Common Stock subject to the Restricted Stock Unit Award.  The consideration to be paid (if any) by the Participant for each share of Common Stock subject to a
      Restricted Stock Unit Award may be paid in any form of legal consideration that may be acceptable to the Board, in its sole discretion, and permissible under applicable law.

     

    (ii)          Vesting.  At the time of the grant of a Restricted Stock Unit Award, the Board may impose such
      restrictions on or conditions to the vesting of the Restricted Stock Unit Award as it, in its sole discretion, deems appropriate.

     

    (iii)        Payment.  A Restricted Stock Unit Award may be settled by the delivery of shares of Common Stock, their
      cash equivalent, any combination thereof or in any other form of consideration, as determined by the Board and contained in the Restricted Stock Unit Award Agreement.

     

    (iv)        Additional Restrictions.  At the time of the grant of a Restricted Stock Unit Award, the Board, as it
      deems appropriate, may impose such restrictions or conditions that delay the delivery of the shares of Common Stock (or their cash equivalent) subject to a Restricted Stock Unit Award to a time after the vesting of such Restricted Stock Unit Award.

     

    (v)          Dividend Equivalents.  Dividend equivalents may be credited in respect of shares of Common Stock covered
      by a Restricted Stock Unit Award, as determined by the Board and contained in the Restricted Stock Unit Award Agreement.  At the sole discretion of the Board, such dividend equivalents may be converted into additional shares of Common Stock covered
      by the Restricted Stock Unit Award in such manner as determined by the Board.  Any additional shares covered by the Restricted Stock Unit Award credited by reason of such dividend equivalents will be subject to all of the same terms and conditions of
      the underlying Restricted Stock Unit Award Agreement to which they relate.

     

    
      

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    (vi)         Termination of Participant’s Continuous Service.  Except as otherwise provided in the applicable
      Restricted Stock Unit Award Agreement, such portion of the Restricted Stock Unit Award that has not vested will be forfeited upon the Participant’s termination of Continuous Service.

     

    (vii)       Compliance with Section 409A of the Code.   Notwithstanding anything to the contrary set forth herein, any
      Restricted Stock Unit Award granted under the Plan that is not exempt from the requirements of Section 409A of the Code shall contain such provisions so that such Restricted Stock Unit Award will comply with the requirements of Section 409A of the
      Code.  Such restrictions, if any, shall be determined by the Board and contained in the Restricted Stock Unit Award Agreement evidencing such Restricted Stock Unit Award.  For example, such restrictions may include, without limitation, a requirement
      that any Common Stock that is to be issued in a year following the year in which the Restricted Stock Unit Award vests must be issued in accordance with a fixed pre-determined schedule.

     

    (c)          Other Stock Awards.  Other forms of Stock Awards valued in whole or in part by reference to, or otherwise
      based on, Common Stock, including the appreciation in value thereof (e.g., options or stock rights with an exercise price or strike price less than one hundred percent (100%) of the Fair Market Value of the Common Stock at the time of grant) may be
      granted either alone or in addition to Stock Awards provided for under Section 5 and the preceding provisions of this Section 6.  Subject to the provisions of the Plan, the Board will have sole and complete authority to determine the persons to whom
      and the time or times at which such Other Stock Awards will be granted, the number of shares of Common Stock (or the cash equivalent thereof) to be granted pursuant to such Other Stock Awards and all other terms and conditions of such Other Stock
      Awards.

     

    7.           Covenants of the Company.

     

    (a)          Availability of Shares.  The Company will keep available at all times the number of shares of Common Stock
      reasonably required to satisfy then-outstanding Stock Awards.

     

    (b)          Securities Law Compliance.  The Company will seek to obtain from each regulatory commission or agency
      having jurisdiction over the Plan such authority as may be required to grant Stock Awards and to issue and sell shares of Common Stock upon exercise of the Stock Awards; provided, however, that this
      undertaking will not require the Company to register under the Securities Act the Plan, any Stock Award or any Common Stock issued or issuable pursuant to any such Stock Award.  If, after reasonable efforts and at a reasonable cost, the Company is
      unable to obtain from any such regulatory commission or agency the authority that counsel for the Company deems necessary for the lawful issuance and sale of Common Stock under the Plan, the Company will be relieved from any liability for failure to
      issue and sell Common Stock upon exercise of such Stock Awards unless and until such authority is obtained. A Participant will not be eligible for the grant of a Stock Award or the subsequent issuance of cash or Common Stock pursuant to the Stock
      Award if such grant or issuance would be in violation of any applicable securities law.

     

    
      

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    (c)          No Obligation to Notify or Minimize Taxes.  The Company will have no duty or obligation to any
      Participant to advise such holder as to the time or manner of exercising such Stock Award.  Furthermore, the Company will have no duty or obligation to warn or otherwise advise such holder of a pending termination or expiration of a Stock Award or a
      possible period in which the Stock Award may not be exercised.  The Company has no duty or obligation to minimize the tax consequences of a Stock Award to the holder of such Stock Award.

     

    8.           Miscellaneous.

     

    (a)          Use of Proceeds from Sales of Common Stock.  Proceeds from the sale of shares of Common Stock pursuant to
      Stock Awards will constitute general funds of the Company.

     

    (b)          Corporate Action Constituting Grant of Stock Awards.  Corporate action constituting a grant by the Company
      of a Stock Award to any Participant will be deemed completed as of the date of such corporate action, unless otherwise determined by the Board, regardless of when the instrument, certificate, or letter evidencing the Stock Award is communicated to,
      or actually received or accepted by, the Participant.  In the event that the corporate records (e.g., Board consents, resolutions or minutes) documenting the corporate action constituting the grant contain terms (e.g., exercise price, vesting
      schedule or number of shares) that are inconsistent with those in the Stock Award Agreement as a result of a clerical error in the papering of the Stock Award Agreement, the corporate records will control and the Participant will have no legally
      binding right to the incorrect term in the Stock Award Agreement.

     

    (c)          Stockholder Rights.  No Participant will be deemed to be the holder of, or to have any of the rights of a
      holder with respect to, any shares of Common Stock subject to a Stock Award unless and until (i) such Participant has satisfied all requirements for exercise of, or the issuance of shares of Common Stock under, the Stock Award pursuant to its terms,
      and (ii) the issuance of the Common Stock subject to the Stock Award has been entered into the books and records of the Company.

     

    (d)          No Employment or Other Service Rights.  Nothing in the Plan, any Stock Award Agreement or any other
      instrument executed thereunder or in connection with any Stock Award granted pursuant thereto will confer upon any Participant any right to continue to serve the Company or an Affiliate in the capacity in effect at the time the Stock Award was
      granted or will affect the right of the Company or an Affiliate to terminate (i) the employment of an Employee with or without notice and with or without cause, (ii) the service of a Consultant pursuant to the terms of such Consultant’s agreement
      with the Company or an Affiliate, or (iii) the service of a Director pursuant to the bylaws of the Company or an Affiliate, and any applicable provisions of the corporate law of the state in which the Company or the Affiliate is incorporated, as the
      case may be.

     

    
      

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    (e)          Change in Time Commitment.  In the event a Participant’s regular level of time commitment in the
      performance of his or her services for the Company and any Affiliates is reduced (for example, and without limitation, if the Participant is an Employee of the Company and the Employee has a change in status from a full-time Employee to a part-time
      Employee) after the date of grant of any Stock Award to the Participant, the Board has the right in its sole discretion to (x) make a corresponding reduction in the number of shares subject to any portion of such Stock Award that is scheduled to vest
      or become payable after the date of such change in time commitment, and (y) in lieu of or in combination with such a reduction, extend the vesting or payment schedule applicable to such Stock Award. In the event of any such reduction, the Participant
      will have no right with respect to any portion of the Stock Award that is so reduced or extended.

     

    (f)          Incentive Stock Option Limitations.  To the extent that the aggregate Fair Market Value (determined at the
      time of grant) of Common Stock with respect to which Incentive Stock Options are exercisable for the first time by any Optionholder during any calendar year (under all plans of the Company and any Affiliates) exceeds one hundred thousand dollars
      ($100,000) (or such other limit established in the Code) or otherwise does not comply with the rules governing Incentive Stock Options, the Options or portions thereof that exceed such limit (according to the order in which they were granted) or
      otherwise do not comply with such rules will be treated as Nonstatutory Stock Options, notwithstanding any contrary provision of the applicable Option Agreement(s).

     

    (g)          Investment Assurances.  The Company may require a Participant, as a condition of exercising or acquiring
      Common Stock under any Stock Award, (i) to give written assurances satisfactory to the Company as to the Participant’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 (ii) to give
      written assurances satisfactory to the Company stating that the Participant is acquiring Common Stock subject to the Stock Award for the Participant’s own account and not with any present intention of selling or otherwise distributing the Common
      Stock.  The foregoing requirements, and any assurances given pursuant to such requirements, will be inoperative if (A) the issuance of the shares upon the exercise or acquisition of Common Stock under the Stock Award has been registered under a then
      currently effective registration statement under the Securities Act, or (B) 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 Common Stock.

     

    
      

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    (h)          Withholding Authorization and Obligations.  As a condition to acceptance of any Stock Award under the
      Plan, Participant authorizes withholding from payroll and any other amounts payable to such Participant, and otherwise agrees to make adequate provision for (including), 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 the grant, exercise, vesting or settlement of such Stock Award, as applicable.  Unless prohibited by the terms of a Stock Award Agreement, the Company may,
      in its sole discretion, satisfy any federal, state or local tax withholding obligation relating to a Stock Award by any of the following means or by a combination of such means: (i) causing the Participant to tender a cash payment; (ii) withholding
      shares of Common Stock from the shares of Common Stock issued or otherwise issuable to the Participant in connection with the Stock Award; provided, however, that no shares of Common Stock are withheld with a
      value exceeding the maximum amount of tax required to be withheld by law (or such other amount as may be necessary to avoid classification of the Stock Award as a liability for financial accounting purposes); (iii) withholding cash from a Stock Award
      settled in cash; (iv) withholding payment from any amounts otherwise payable to the Participant; or (v) by such other method as may be set forth in the Stock Award Agreement.  As a condition to accepting a Stock Award under the Plan, in the event
      that the amount of the Company’s withholding obligation in connection with such Stock Award was greater than the amount actually withheld by the Company, each Participant agrees to indemnify and hold the Company harmless from any failure by the
      Company to withhold the proper amount.

     

    (i)          Electronic Delivery.  Any reference herein to a “written” agreement or document will include any agreement
      or document delivered electronically or posted on the Company’s intranet (or other shared electronic medium controlled by the Company to which the Participant has access).

     

    (j)          Deferrals.  To the extent permitted by applicable law, the Board, in its sole discretion, may determine
      that the delivery of Common Stock or the payment of cash, upon the exercise, vesting or settlement of all or a portion of any Stock Award may be deferred and may establish programs and procedures for deferral elections to be made by Participants. 
      Deferrals by Participants will be made in accordance with Section 409A of the Code.  Consistent with Section 409A of the Code, the Board may provide for distributions while a Participant is still an employee or otherwise providing services to the
      Company.  The Board is authorized to make deferrals of Stock Awards and determine when, and in what annual percentages, Participants may receive payments, including lump sum payments, following the Participant’s termination of Continuous Service, and
      implement such other terms and conditions consistent with the provisions of the Plan and in accordance with applicable law.

     

    (k)          Compliance with Section 409A of the Code.  To the extent that the Board determines that any Stock Award
      granted hereunder is subject to Section 409A of the Code, the Stock Award Agreement evidencing such Stock Award shall incorporate the terms and conditions necessary to avoid the consequences specified in Section 409A(a)(1) of the Code.  To the extent
      applicable, the Plan and Stock Award Agreements shall be interpreted in accordance with Section 409A of the Code.

     

    (l)          Repurchase Limitation.  The terms of any repurchase right will be specified in the Stock Award Agreement. 
      The repurchase price for vested shares of Common Stock will be the Fair Market Value of the shares of Common Stock on the date of repurchase.  The repurchase price for unvested shares of Common Stock will be the lower of (i) the Fair Market Value of
      the shares of Common Stock on the date of repurchase or (ii) their original purchase price.  However, the Company will not exercise its repurchase right until at least six (6) months (or such longer or shorter period of time necessary to avoid
      classification of the Stock Award as a liability for financial accounting purposes) have elapsed following delivery of shares of Common Stock subject to the Stock Award, unless otherwise specifically provided by the Board.

     

    
      

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    9.           Adjustments upon Changes in Common Stock; Other Corporate Events.

     

    (a)          Capitalization Adjustments.  In the event of a Capitalization Adjustment, the Board will appropriately
      and  proportionately adjust: (i) the class(es) and maximum number of securities subject to the Plan pursuant to Section 3(a), (ii) the class(es) and maximum number of securities that may be issued pursuant to the exercise of Incentive Stock Options
      pursuant to Section 3(c), and (iii) the class(es) and number of securities and price per share of stock subject to outstanding Stock Awards.  The Board will make such adjustments, and its determination will be final, binding and conclusive.

     

    (b)          Dissolution.  Except as otherwise provided in the Stock Award Agreement, in the event of a Dissolution of
      the Company, all outstanding Stock Awards (other than Stock Awards consisting of vested and outstanding shares of Common Stock not subject to a forfeiture condition or the Company’s right of repurchase) will terminate immediately prior to the
      completion of such Dissolution, and the shares of Common Stock subject to the Company’s repurchase rights or subject to a forfeiture condition may be repurchased or reacquired by the Company notwithstanding the fact that the holder of such Stock
      Award is providing Continuous Service, provided, however, that the Board may, in its sole discretion, cause some or all Stock Awards to become fully vested, exercisable and/or no longer subject to repurchase
      or forfeiture (to the extent such Stock Awards have not previously expired or terminated) before the Dissolution is completed but contingent on its completion.

     

    (c)          Transactions. 

     

    (i)          In the event of a Transaction, each outstanding Stock Award shall be treated as the Board determines, including, without limitation, that each
      Stock Award be assumed, continued or a similar award substituted for the Stock Award by the surviving corporation or acquiring corporation (or its parent company). The Board shall not be required to treat all Stock Awards similarly in the
      Transaction.

     

    (ii)          Notwithstanding the foregoing, in the event of a Change in Control in which the surviving corporation or acquiring corporation (or its parent
      company) does not assume or continue such outstanding Stock Awards or substitute similar stock awards for the Stock Award, then with respect to Stock Awards that have not been assumed, continued or substituted, the Participant shall fully vest in and
      have the right to exercise his or her outstanding Stock Awards, including shares as to which such Stock Award would not otherwise be vested or exercisable, and any reacquisition or repurchase rights held by the Company with respect to such Stock
      Awards will lapse. In addition, if a Stock Award is not assumed, continued or substituted in the event of a Change in Control, the Board shall notify the Participant in writing or electronically that the Stock Award shall be fully vested and
      exercisable for a period of time determined by the Board in its sole discretion, and any Stock Award not assumed, continued or substituted for shall terminate upon the expiration of such period for no consideration, unless otherwise determined by the
      Board.

     

    
      

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    (iii)        For the purposes of this Section 9(c), the Stock Award shall be considered assumed if, following the Change in Control, the Stock Award confers
      the right to purchase or receive, for each share subject to the Stock Award immediately prior to the Change in Control, the consideration (whether stock, cash, or other securities or property) received in the Change in Control by holders of Common
      Stock for each share held on the effective date of the transaction (and if holders were offered a choice of consideration, the type of consideration chosen by the holders of a majority of the outstanding shares); provided,

        however, that if such consideration received in the Change in Control is not solely common stock of the successor corporation or its parent, the Board may, with the consent of the successor corporation, provide for the consideration to be
      received upon the exercise of the Stock Award, for each share subject to the Stock Award, to be solely common stock of the successor corporation or its parent equal in fair market value to the per share consideration received by holders of Common
      Stock in the Change in Control. 

     

    (d)          A Stock Award may be subject to additional acceleration of vesting and exercisability upon or after a Change in Control as may be provided in the
      Stock Award Agreement for such Stock Award or as may be provided in any other written agreement between the Company or any Affiliate and the Participant, but in the absence of such provision, no such acceleration will automatically occur.

     

    10.         Plan Term; Earlier Termination or Suspension of the Plan.

     

    (a)          Plan Term.  The Board may suspend or terminate the Plan at any time.  Unless terminated sooner by the
      Board, the Plan will automatically terminate on the day before the tenth (10th) anniversary of the earlier of (i) the date the Plan is adopted by the Board, or (ii) the date the Plan is approved by the stockholders of the Company.  No Stock Awards
      may be granted under the Plan while the Plan is suspended or after it is terminated.

     

    (b)          No Impairment of Rights.  Suspension or termination of the Plan will not impair rights and obligations
      under any Stock Award granted while the Plan is in effect except with the written consent of the affected Participant or as otherwise permitted in the Plan.

     

    11.          Effective Date of Plan.

     

    This Plan will become effective on the Effective Date.

     

    12.         Choice of Law.

     

    The laws of the State of Delaware will govern all questions concerning the construction, validity and interpretation of this Plan,
      without regard to that state’s conflict of laws rules.

     

    
      

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    13.          Definitions.   As used in the Plan, the following definitions will apply to the capitalized terms
      indicated below:

     

    (a)          “Affiliate” means, at the time of determination, any “parent” or “majority-owned
      subsidiary” of the Company, as such terms are defined in Rule 405.  The Board will have the authority to determine the time or times at which “parent” or “majority-owned subsidiary” status is determined within the foregoing definition.

     

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

     

    (c)          “Capitalization Adjustment” means any change that is made in, or other events that
      occur with respect to, the Common Stock subject to the Plan or subject to any Stock Award after the Effective Date without the receipt of consideration by the Company through merger, consolidation, reorganization, recapitalization, reincorporation,
      stock dividend, dividend in property other than cash, large nonrecurring cash dividend, stock split, reverse stock split, liquidating dividend, combination of shares, exchange of shares, change in corporate structure, or any similar equity
      restructuring transaction, as that term is used in Statement of Financial Accounting Standards Board Accounting Standards Codification Topic 718 (or any successor thereto).  Notwithstanding the foregoing, the conversion of any convertible securities
      of the Company will not be treated as a Capitalization Adjustment.

     

    (d)          “Cause” will have the
      meaning ascribed to such term in any written agreement between the Participant and the Company defining such term and, in the absence of such agreement, such term means, with respect to a Participant, the occurrence of any of the following events: 
      (i) such Participant’s commission of any felony or any crime involving fraud, dishonesty or moral turpitude under the laws of the United States or any state thereof; (ii) such Participant’s attempted commission of, or participation in, a fraud or act
      of dishonesty against the Company; (iii) such Participant’s intentional, material violation of any contract or agreement between the Participant and the Company or of any statutory duty owed to the Company; (iv) such Participant’s unauthorized use or
      disclosure of the Company’s confidential information or trade secrets; or (v) such Participant’s gross misconduct. The determination that a termination of the Participant’s Continuous Service is either for Cause or without Cause will be made by the
      Company, in its sole discretion.  Any determination by the Company that the Continuous Service of a Participant was terminated with or without Cause for the purposes of outstanding Stock Awards held by such Participant will have no effect upon any
      determination of the rights or obligations of the Company or such Participant for any other purpose.

     

    (e)           “Change in Control” means the occurrence, in a single transaction or in a series of
      related transactions, of any one or more of the following events:

     

    
      

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    (i)         any Exchange Act Person becomes the Owner, directly or indirectly, of securities of the Company representing more than fifty percent (50%) of the
      combined voting power of the Company’s then outstanding securities other than by virtue of a merger, consolidation or similar transaction.  Notwithstanding the foregoing, a Change in Control will not be deemed to occur (A) on account of the
      acquisition of securities of the Company directly from the Company, (B) on account of the acquisition of securities of the Company by an investor, any affiliate thereof or any other Exchange Act Person that acquires the Company’s securities in a
      transaction or series of related transactions the primary purpose of which is to obtain financing for the Company through the issuance of equity securities or (C) solely because the level of Ownership held by any Exchange Act Person (the “Subject Person”) exceeds the designated percentage threshold of the outstanding voting securities as a result of a repurchase or other acquisition of voting securities by the Company reducing
      the number of shares outstanding, provided that if a Change in Control would occur (but for the operation of this sentence) as a result of the acquisition of voting securities by the Company, and after such share acquisition, the Subject Person
      becomes the Owner of any additional voting securities that, assuming the repurchase or other acquisition had not occurred, increases the percentage of the then outstanding voting securities Owned by the Subject Person over the designated percentage
      threshold, then a Change in Control will be deemed to occur;

     

    (ii)         there is consummated a merger, consolidation or similar transaction involving (directly or indirectly) the Company and, immediately after the
      consummation of such merger, consolidation or similar transaction, the stockholders of the Company immediately prior thereto do not Own, directly or indirectly, either (A) outstanding voting securities representing more than fifty percent (50%) of
      the combined outstanding voting power of the surviving Entity in such merger, consolidation or similar transaction or (B) more than fifty percent (50%) of the combined outstanding voting power of the parent of the surviving Entity in such merger,
      consolidation or similar transaction, in each case in substantially the same proportions as their Ownership of the outstanding voting securities of the Company immediately prior to such transaction;

     

    (iii)         the stockholders of the Company approve or the Board approves a plan of complete dissolution or liquidation of the Company, or a complete
      dissolution or liquidation of the Company will otherwise occur, except for a liquidation into a parent corporation;

     

    (iv)        there is consummated a sale, lease, exclusive license or other disposition of all or substantially all of the consolidated assets of the Company
      and its Subsidiaries, other than a sale, lease, license or other disposition of all or substantially all of the consolidated assets of the Company and its Subsidiaries to an Entity, more than fifty percent (50%) of the combined voting power of the
      voting securities of which are Owned by stockholders of the Company in substantially the same proportions as their Ownership of the outstanding voting securities of the Company immediately prior to such sale, lease, license or other disposition; or

     

    (v)         individuals who, on the date this Plan is adopted by the Board, are members of the Board (the “Incumbent

        Board”) cease for any reason to constitute at least a majority of the members of the Board; provided, however, that if the appointment or election (or nomination for election) of any new Board member
      was approved or recommended by a majority vote of the members of the Incumbent Board then still in office, such new member shall, for purposes of this Plan, be considered as a member of the Incumbent Board.

     

    
      

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    Notwithstanding the foregoing definition or any other provision of this Plan, (A) the term Change in Control will not include a sale of assets, merger or other transaction effected exclusively for the purpose of
      changing the domicile of the Company, and (B) the definition of Change in Control (or any analogous term) in an individual written agreement between the Company or any Affiliate and the Participant will supersede the foregoing definition with respect
      to Stock Awards subject to such agreement; provided, however, that if no definition of Change in Control or any analogous term is set forth in such an individual written agreement, the foregoing definition
      will apply.

     

    (f)           “Code” means the Internal Revenue Code of 1986, as amended, including any applicable
      regulations and guidance thereunder.

     

    (g)          “Committee” means a committee of one (1) or more Directors to whom authority has been
      delegated by the Board in accordance with Section 2(c).

     

    (h)          “Common Stock” means the common stock of the Company.

     

    (i)            “Company” means Castle Biosciences, Inc., a Delaware corporation.

     

    (j)         “Consultant” means any person, including an advisor, who is (i) engaged by the Company
      or an Affiliate to render consulting or advisory services and is compensated for such services, or (ii) serving as a member of the board of directors of an Affiliate and is compensated for such services.  However, service solely as a Director, or
      payment of a fee for such service, will not cause a Director to be considered a “Consultant” for purposes of the Plan.

     

    (k)         “Continuous Service” means that the Participant’s service with the Company or an
      Affiliate, whether as an Employee, Director or Consultant, is not interrupted or terminated.  A change in the capacity in which the Participant renders service to the Company or an Affiliate as an Employee, Director or Consultant or a change in the
      Entity for which the Participant renders such service, provided that there is no interruption or termination of the Participant’s service with the Company or an Affiliate, will not terminate a Participant’s Continuous Service; provided, however, that if the Entity for which a Participant is rendering services ceases to qualify as an Affiliate, as determined by the Board in its sole discretion, such Participant’s Continuous Service will
      be considered to have terminated on the date such Entity ceases to qualify as an Affiliate.  For example, a change in status from an Employee of the Company to a Consultant of an Affiliate or to a Director will not constitute an interruption of
      Continuous Service.  To the extent permitted by law, the Board or the chief executive officer of the Company, in that party’s sole discretion, may determine whether Continuous Service will be considered interrupted in the case of (i) any leave of
      absence approved by the Board or chief executive officer, including sick leave, military leave or any other personal leave, or (ii) transfers between the Company, an Affiliate, or their successors.  Notwithstanding the foregoing, a leave of absence
      will be treated as Continuous Service for purposes of vesting in a Stock Award only to such extent as may be provided in the Company’s leave of absence policy, in the written terms of any leave of absence agreement or policy applicable to the
      Participant, or as otherwise required by law.

     

    (l)           “Corporate Transaction” means the consummation, in a single transaction or in a
      series of related transactions, of any one or more of the following events:

     

    
      

      21

      
        

    

    (i)           a sale or other disposition of all or substantially all, as determined by the Board in its sole
      discretion, of the consolidated assets of the Company and its Subsidiaries;

     

    (ii)          a sale or other disposition of more than fifty percent (50%) of the outstanding securities of the Company;

     

    (iii)         a merger, consolidation or similar transaction following which the Company is not the surviving corporation; or

     

    (iv)         a merger, consolidation or similar transaction following which the Company is the surviving corporation but the shares of Common Stock outstanding
      immediately preceding the merger, consolidation or similar transaction are converted or exchanged by virtue of the merger, consolidation or similar transaction into other property, whether in the form of securities, cash or otherwise.

     

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

     

    (n)         “Disability” means, with respect to a Participant, the inability of such Participant to
      engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment that can be expected to result in death or that has lasted or can be expected to last for a continuous period of not less than twelve
      (12) months as provided in Sections 22(e)(3) and 409A(a)(2)(c)(i) of the Code, and will be determined by the Board on the basis of such medical evidence as the Board deems warranted under the circumstances.

     

    (o)          “Dissolution” means when the Company, after having executed a certificate of
      dissolution with the State of Delaware, has completely wound up its affairs.  Conversion of the Company into a Limited Liability Company will not be considered a “Dissolution” for purposes of the Plan.

     

    (p)          “Effective Date” means the effective date of this Plan, which is the earlier of (i)
      the date that this Plan is first approved by the Company’s stockholders, and (ii) the date this Plan is adopted by the Board.

     

    (q)          “Employee” means any person employed by the Company or an Affiliate.  However, service
      solely as a Director, or payment of a fee for such services, will not cause a Director to be considered an “Employee” for purposes of the Plan.

     

    (r)           “Entity” means a corporation, partnership, limited liability company or other entity.

     

    (s)           “Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules
      and regulations promulgated thereunder.

     

    
      

      22

      
        

    

    (t)           “Exchange Act Person” means

      any natural person, Entity or “group” (within the meaning of Section 13(d) or 14(d) of the Exchange Act), except that “Exchange Act Person” will not include (i) the Company or any Subsidiary of the Company, (ii) any employee benefit plan of the
      Company or any Subsidiary of the Company or any trustee or other fiduciary holding securities under an employee benefit plan of the Company or any Subsidiary of the Company, (iii) an underwriter temporarily holding securities pursuant to an offering
      of such securities, (iv) an Entity Owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their Ownership of stock of the Company; or (v) any natural person, Entity or “group” (within the meaning of
      Section 13(d) or 14(d) of the Exchange Act) that, as of the Effective Date, is the Owner, directly or indirectly, of securities of the Company representing more than fifty percent (50%) of the combined voting power of the Company’s then outstanding
      securities.

     

    (u)          “Fair Market Value” means, as of any date, the value of the Common Stock determined by
      the Board in compliance with Section 409A of the Code or, in the case of an Incentive Stock Option, in compliance with Section 422 of the Code.

     

    (v)          “Incentive Stock Option” means an option granted pursuant to Section 5 of the Plan
      that is intended to be, and that qualifies as, an “incentive stock option” within the meaning of Section 422 of the Code.

     

    (w)          “Nonstatutory Stock Option” means any option granted pursuant to Section 5 of the Plan
      that does not qualify as an Incentive Stock Option.

     

    (x)           “Officer” means any person designated by the Company as an officer.

     

    (y)           “Option” means an Incentive Stock Option or a Nonstatutory Stock Option to purchase
      shares of Common Stock granted pursuant to the Plan.

     

    (z)           “Option Agreement” means a written agreement between the Company and an Optionholder
      evidencing the terms and conditions of an Option grant.  Each Option Agreement will be subject to the terms and conditions of the Plan.

     

    (aa)         “Optionholder” means a person to whom an Option is granted pursuant to the Plan or, if
      applicable, such other person who holds an outstanding Option.

     

    (bb)        “Other Stock Award” means an award based in whole or in part by reference to the Common
      Stock which is granted pursuant to the terms and conditions of Section 6(c).

     

    (cc)        “Other Stock Award Agreement” means a written agreement between the Company and a
      holder of an Other Stock Award evidencing the terms and conditions of an Other Stock Award grant.  Each Other Stock Award Agreement will be subject to the terms and conditions of the Plan.

     

    (dd)       “Own,” “Owned,” “Owner,” “Ownership”  A person or Entity will be deemed to “Own,” to have “Owned,” to be the
      “Owner” of, or to have acquired “Ownership” of securities if such person or Entity, directly or indirectly, through any contract, arrangement, understanding, relationship or otherwise, has or shares voting power, which includes the power to vote or
      to direct the voting, with respect to such securities.

     

    
      

      23

      
        

    

    (ee)          “Participant” means a person to whom a Stock Award is granted pursuant to the Plan
      or, if applicable, such other person who holds an outstanding Stock Award.

     

    (ff)          “Plan” means this Castle Biosciences, Inc. 2018

      Equity Incentive Plan, as it may be amended from time to time.

     

    (gg)         “Restricted Stock Award” means an award of shares of Common Stock which is granted
      pursuant to the terms and conditions of Section 6(a).

     

    (hh)        “Restricted Stock Award Agreement” means a written agreement between the Company and a
      holder of a Restricted Stock Award evidencing the terms and conditions of a Restricted Stock Award grant.  Each Restricted Stock Award Agreement will be subject to the terms and conditions of the Plan.

     

    (ii)          “Restricted Stock Unit Award” means

      a right to receive shares of Common Stock which is granted pursuant to the terms and conditions of Section 6(b).

     

    (jj)          “Restricted Stock Unit Award Agreement” means a written agreement between the Company and a holder of a Restricted Stock Unit Award evidencing the terms and conditions of a Restricted Stock Unit Award grant.  Each Restricted Stock Unit Award Agreement will be subject to
      the terms and conditions of the Plan.

     

    (kk)        “Rule 405” means Rule 405 promulgated under the Securities Act.

     

    (ll)          “Rule 701” means Rule 701 promulgated under the Securities Act.

     

    (mm)      “Securities Act” means the Securities Act of 1933, as amended.

     

    (nn)         “Stock Appreciation Right” or “SAR”
      means a right to receive the appreciation on Common Stock that is granted pursuant to the terms and conditions of Section 5.

     

    (oo)         “Stock Appreciation Right Agreement” means a written agreement between the Company and
      a holder of a Stock Appreciation Right evidencing the terms and conditions of a Stock Appreciation Right grant.  Each Stock Appreciation Right Agreement will be subject to the terms and conditions of the Plan.

     

    (pp)        “Stock Award” means any right to receive Common Stock granted under the Plan, including
      an Incentive Stock Option, a Nonstatutory Stock Option, a Restricted Stock Award, a Restricted Stock Unit Award, a Stock Appreciation Right or any Other Stock Award.

     

    (qq)        “Stock Award Agreement” means a written agreement between the Company and a Participant
      evidencing the terms and conditions of a Stock Award grant.  Each Stock Award Agreement will be subject to the terms and conditions of the Plan.

     

    
      

      24

      
        

    

    (rr)         “Subsidiary” means, with respect to the Company, (i) any corporation of which more
      than fifty percent (50%) of the outstanding capital stock having ordinary voting power to elect a majority of the board of directors of such corporation (irrespective of whether, at the time, stock of any other class or classes of such corporation
      will have or might have voting power by reason of the happening of any contingency) is at the time, directly or indirectly, Owned by the Company, and (ii) any partnership, limited liability company or other entity in which the Company has a direct or
      indirect interest (whether in the form of voting or participation in profits or capital contribution) of more than fifty percent (50%) .

     

    (ss)          “Ten Percent Stockholder” means a person who 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 any Affiliate.

     

    (tt)          “Transaction” means a Corporate Transaction or a Change in Control.

     

    

    

    
      25Exhibit 10.6

    

     

    

    
      Castle Biosciences, Inc.

      

      

      2019 Equity Incentive Plan

      

      

      Adopted by the Board of Directors: July 11, 2019

      Approved by the Stockholders: July 11, 2019

      IPO Date: [‧], 2019

      

      

      1.          General.

      

      

      (a)         Successor to and Continuation of Prior Plan. The Plan is intended as the successor to and continuation of the Castle Biosciences, Inc. 2018 Equity
          Incentive Plan (the “Prior Plan”). From and after 12:01 a.m. Pacific Time on the IPO Date, no additional stock awards will
          be granted under the Prior Plan. All Awards granted on or after 12:01 a.m. Pacific Time on the IPO Date will be granted under this Plan. All stock awards granted under the Prior Plan will remain subject to the terms of the Prior Plan.

      

      

      (i)          Any
          shares that would otherwise remain available for future grants under the Prior Plan as of 12:01 a.m. Pacific Time on the IPO Date (the “Prior Plan’s Available Reserve”) will cease to be available under the Prior Plan at such time. Instead, that number of shares of Common Stock equal to the Prior Plan’s Available Reserve will be added to the Share Reserve (as
          further described in Section 3(a) below) and will be immediately available for grants and issuance pursuant to Stock Awards hereunder, up to the maximum number set forth in Section 3(a) below.

      

      

      (ii)         In addition, from and after 12:01 a.m. Pacific Time on the IPO Date, any shares
        subject, at such time, to outstanding stock awards granted under the Prior Plan or the Castle Biosciences, Inc. 2008 Stock Plan that (i) expire or terminate for any reason prior to exercise or settlement; (ii) are forfeited because of the failure
        to meet a contingency or condition required to vest such shares or otherwise return to the Company; or (iii) are reacquired, withheld (or not issued) to satisfy a tax withholding obligation in connection with an award or to satisfy the purchase
        price or exercise price of a stock award (such shares the “Returning Shares”) will immediately be added to the Share Reserve (as further described in Section 3(a) below) as and when such
        shares become Returning Shares, up to the maximum number set forth in Section 3(a) below.

      

      

      (b)          Eligible Award Recipients. Employees, Directors and Consultants are eligible to receive Awards.

      

      

      (c)        Available Awards. The Plan provides for the grant of the following types of Awards: (i) Incentive Stock Options, (ii) Nonstatutory Stock Options,
          (iii) Stock Appreciation Rights (iv) Restricted Stock Awards, (v) Restricted Stock Unit Awards, (vi) Performance Stock Awards, (vii) Performance Cash Awards, and (viii) Other Stock Awards.

      

      

      (d)         Purpose. The Plan, through the granting of Awards, is intended to help the Company secure and retain the services of eligible award recipients,
          provide incentives for such persons to exert maximum efforts for the success of the Company and any Affiliate and provide a means by which the eligible recipients may benefit from increases in value of the Common Stock.

      

      

      2.          Administration.

      

      

      (a)          Administration by Board. The Board will administer the Plan. The Board may delegate administration of the Plan to a Committee or Committees, as
          provided in Section 2(c).

      
        
          

      

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

      

      

      (i)          To
          determine (A) who will be granted Awards; (B) when and how each Award will be granted; (C) what type of Award will be granted; (D) the provisions of each Award (which need not be identical), including when a person will be permitted to exercise
          or otherwise receive cash or Common Stock under the Award; (E) the number of shares of Common Stock subject to, or the cash value of, an Award; and (F) the Fair Market Value applicable to a Stock Award.

      

      

      (ii)         To
          construe and interpret the Plan and Awards granted under it, and to establish, amend and revoke rules and regulations for administration of the Plan and Awards. The Board, in the exercise of these powers, may correct any defect, omission or
          inconsistency in the Plan or in any Award Agreement or in the written terms of a Performance Cash Award, in a manner and to the extent it will deem necessary or expedient to make the Plan or Award fully effective.

      

      

      (iii)         To
          settle all controversies regarding the Plan and Awards granted under it.

      

      

      (iv)         To
          accelerate, in whole or in part, the time at which an Award may be exercised or vest (or the time at which cash or shares of Common Stock may be issued in settlement thereof).

      

      

      (v)         To
          suspend or terminate the Plan at any time. Except as otherwise provided in the Plan or an Award Agreement, suspension or termination of the Plan will not materially impair a Participant’s rights under the Participant’s then-outstanding Award
          without the Participant’s written consent except as provided in subsection (viii) below.

      

      

      (vi)        To
          amend the Plan in any respect the Board deems necessary or advisable, including, without limitation, by adopting amendments relating to Incentive Stock Options and certain nonqualified deferred compensation under Section 409A of the Code and/or
          bringing the Plan or Awards granted under the Plan into compliance with the requirements for Incentive Stock Options or ensuring that they are exempt from or compliant with the requirements for nonqualified deferred compensation under Section
          409A of the Code, subject to the limitations, if any, of applicable law. If required by applicable law or listing requirements, and except as provided in Section 9(a) relating to Capitalization Adjustments, the Company will seek stockholder
          approval of any amendment of the Plan that (A) materially increases the number of shares of Common Stock available for issuance under the Plan, (B) materially expands the class of individuals eligible to receive Awards under the Plan, (C)
          materially increases the benefits accruing to Participants under the Plan, (D) materially reduces the price at which shares of Common Stock may be issued or purchased under the Plan, (E) materially extends the term of the Plan, or (F) materially
          expands the types of Awards available for issuance under the Plan. Except as otherwise provided in the Plan or an Award Agreement, no amendment of the Plan will materially impair a Participant’s rights under an outstanding Award without the
          Participant’s written consent.

      

      

      (vii)        To
          submit any amendment to the Plan for stockholder approval, including, but not limited to, amendments to the Plan intended to satisfy the requirements of (A) Section 422 of the Code regarding incentive stock options or (B) Rule 16b-3.

      

      

      (viii)      To
          approve forms of Award Agreements for use under the Plan and to amend the terms of any one or more Awards, including, but not limited to, amendments to provide terms more favorable to the Participant than previously provided in the Award
          Agreement, subject to any specified limits in the Plan that are not subject to Board discretion; provided however, that a Participant’s
          rights under any Award will not be impaired by any such amendment unless (A) the Company requests the consent of the affected Participant, and (B) such Participant consents in writing. Notwithstanding the foregoing, (1) a Participant’s rights
          will not be deemed to have been impaired by any such amendment if the Board, in its sole discretion, determines that the amendment, taken as a whole, does not materially impair the Participant’s rights, and (2) subject to the limitations of
          applicable law, if any, the Board may amend the terms of any one or more Awards without the affected Participant’s consent (A) to maintain the qualified status of the Award as an Incentive Stock Option under Section 422 of the Code; (B) to change
          the terms of an Incentive Stock Option, if such change results in impairment of the Award solely because it impairs the qualified status of the Award as an Incentive Stock Option under Section 422 of the Code; (C) to clarify the manner of
          exemption from, or to bring the Award into compliance with, Section 409A of the Code; or (D) to comply with other applicable laws or listing requirements.

      
        
          

      

      (ix)         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 that are not in conflict with the provisions of the Plan or Awards.

      

      

      (x)          To
          adopt such procedures and sub-plans as are necessary or appropriate to permit participation in the Plan by Employees, Directors or Consultants who are foreign nationals or employed outside the United States (provided that Board approval will not
          be necessary for immaterial modifications to the Plan or any Award Agreement that are required for compliance with the laws of the relevant foreign jurisdiction).

      

      

      (xi)         To
          effect, with the consent of any adversely affected Participant, (A) the reduction of the exercise, purchase or strike price of any outstanding Stock Award; (B) the cancellation of any outstanding Stock Award and the grant in substitution therefor
          of a new (1) Option or SAR, (2) Restricted Stock Award, (3) Restricted Stock Unit Award, (4) Other Stock Award, (5) cash and/or (6) other valuable consideration
            determined by the Board, in its sole discretion, with any such substituted award (x) covering the same or a different number of shares of Common Stock as the cancelled Stock Award and (y) granted under the Plan or another equity or compensatory
            plan of the Company; or (C) any other action that is treated as a repricing under generally accepted accounting principles.

      

      

      (c)          Delegation to Committee.

      

      

      (i)          General. The Board may delegate some or all of the administration of the Plan to a Committee or Committees. If administration of the Plan is
          delegated to a Committee, the Committee will have, in connection with the administration of the Plan, the powers theretofore possessed by the Board that have been delegated to the Committee, including the power to delegate to a subcommittee of
          the Committee any of the administrative powers the Committee is authorized to exercise (and references in this Plan to the Board will thereafter be to the Committee or subcommittee, as applicable). Any delegation of administrative powers will be
          reflected in resolutions, not inconsistent with the provisions of the Plan, adopted from time to time by the Board or Committee (as applicable). The Committee may, at any time, abolish the subcommittee and/or revest in the Committee any powers
          delegated to the subcommittee. The Board may retain the authority to concurrently administer the Plan with the Committee and may, at any time, revest in the Board some or all of the powers previously delegated.

      

      

      (ii)          Rule 16b-3 Compliance. The Committee may consist solely of two or more Non-Employee Directors, in accordance with Rule 16b-3.

      

      

      (d)         Delegation to an Officer. The Board may delegate to one or more Officers the authority to do one or both of the following (i) designate Employees
          who are not Officers to be recipients of Options and SARs (and, to the extent permitted by applicable law, other Stock Awards) and, to the extent permitted by applicable law, the terms of such Awards, and (ii) determine the number of shares of
          Common Stock to be subject to such Stock Awards granted to such Employees; provided, however, that the Board resolutions regarding such
          delegation will specify the total number of shares of Common Stock that may be subject to the Stock Awards granted by such Officer and that such Officer may not grant a Stock Award to himself or herself. Any such Stock Awards will be granted on
          the form of Stock Award Agreement most recently approved for use by the Committee or the Board, unless otherwise provided in the resolutions approving the delegation authority. The Board may not delegate authority to an Officer who is acting
          solely in the capacity of an Officer (and not also as a Director) to determine the Fair Market Value pursuant to Section 13(w)(iii) below.

      
        
          

      

      (e)          Effect of Board’s Decision. All determinations, interpretations and constructions made by the Board in good faith will not be subject to review by
          any person and will be final, binding and conclusive on all persons.

      

      

      3.          Shares Subject to the Plan.

      

      

      (a)        Share Reserve. Subject to Section 9(a) relating to Capitalization Adjustments, and the following sentence regarding the annual increase, the
          aggregate number of shares of Common Stock that may be issued pursuant to Stock Awards will not exceed 3,907,776 shares (the “Share Reserve”), which number is the sum of (i) 1,931,020 new shares, plus (ii) the number of shares subject to the Prior Plan’s Available Reserve, plus (iii)
          the number of shares that are Returning Shares, as such shares become available from time to time. In addition, the Share Reserve will automatically increase on January 1st of each year, for a period of not more than ten years,
          commencing on January 1st of the year following the year in which the IPO Date occurs and ending on (and including) January 1, 2029, in an amount equal to 5% of the total number of shares of Capital Stock outstanding on December 31st
          of the preceding calendar year. Notwithstanding the foregoing, the Board may act prior to January 1st of a given year to provide that there will be no January 1st increase in the Share Reserve for such year or that the
          increase in the Share Reserve for such year will be a lesser number of shares of Common Stock than would otherwise occur pursuant to the preceding sentence.

      

      

      For clarity, the Share Reserve in this Section 3(a) is a limitation on the number of shares of Common Stock that may be issued
        pursuant to the Plan. Accordingly, this Section 3(a) does not limit the granting of Stock Awards except as provided in Section 7(a). Shares may be issued in connection with a merger or acquisition as permitted by Nasdaq Listing Rule 5635(c) or, if
        applicable, NYSE Listed Company Manual Section 303A.08, AMEX Company Guide Section 711 or other applicable rule, and such issuance will not reduce the number of shares available for issuance under the Plan.

      

      

      (b)         Reversion of Shares to the Share Reserve. If a Stock Award or any portion thereof (i) expires or otherwise terminates without all of the shares
          covered by such Stock Award having been issued or (ii) is settled in cash (i.e., the Participant receives cash rather than stock), such
          expiration, termination or settlement will not reduce (or otherwise offset) the number of shares of Common Stock that may be available for issuance under the Plan. If any shares of Common Stock issued pursuant to a Stock Award are forfeited back
          to or repurchased or reacquired by the Company for any reason, including because of the failure to meet a contingency or condition required to vest such shares in the Participant, then the shares that are forfeited or repurchased or reacquired
          will revert to and again become available for issuance under the Plan. Any shares reacquired by the Company in satisfaction of tax withholding obligations on a Stock Award or as consideration for the exercise or purchase price of a Stock Award
          will again become available for issuance under the Plan.

      

      

      (c)          Incentive Stock Option Limit. Subject to the Share Reserve and Section 9(a) relating to Capitalization Adjustments, the aggregate maximum number
          of shares of Common Stock that may be issued pursuant to the exercise of Incentive Stock Options will be a number of shares of Common Stock equal to three multiplied by the Share Reserve.

      
        
          

      

      (d)         Limitation on Grants to Non-Employee Directors. The maximum number of shares of Common Stock subject to Stock Awards granted under the  Plan or
          otherwise during a single calendar year to any Non-Employee Director, taken together with any cash fees paid by the Company to such Non-Employee Director during such calendar year for service on the Board, will not exceed $350,000 in total value
          (calculating the value of any such Stock Awards based on the grant date fair value of such Stock Awards for financial reporting purposes), or, with respect to the calendar year in which a Non-Employee Director is first appointed or elected to the
          Board, $550,000.

      

      

      (e)          Source of Shares. The stock issuable under the Plan will be shares of authorized but unissued or reacquired Common Stock, including shares
          repurchased by the Company on the open market or otherwise.

      

      

      4.          Eligibility.

      

      

      (a)         Eligibility for Specific Stock Awards. Incentive Stock Options may be granted only to employees of the Company or a “parent corporation” or
          “subsidiary corporation” thereof (as such terms are defined in Sections 424(e) and 424(f) of the Code). Stock Awards other than Incentive Stock Options may be granted to Employees, Directors and Consultants; provided, however, that Stock Awards
          may not be granted to Employees, Directors and Consultants who are providing Continuous Service only to any “parent” of the Company, as such term is defined in Rule 405 of the Securities Act, unless (i) the stock underlying such Stock Awards is
          treated as “service recipient stock” under Section 409A of the Code (for example, because the Stock Awards are granted pursuant to a corporate transaction such as a spin off transaction), (ii) the Company, in consultation with its legal counsel,
          has determined that such Stock Awards are otherwise exempt from Section 409A of the Code, or (iii) the Company, in consultation with its legal counsel, has determined that such Stock Awards comply with the distribution requirements of Section
          409A of the Code.

      

      

      (b)         Ten Percent Stockholders. A Ten Percent Stockholder will not be granted an Incentive Stock Option unless the exercise price of such Option is at
          least 110% of the Fair Market Value on the date of grant and the Option is not exercisable after the expiration of five years from the date of grant.

      

      

      5.          Provisions Relating to Options and Stock Appreciation Rights.

      

      

      Each Option or SAR will be in such form and will contain such terms and conditions as the Board deems appropriate. All Options will be
        separately designated Incentive Stock Options or Nonstatutory Stock Options at the time of grant, and, if certificates are issued, a separate certificate or certificates will be issued for shares of Common Stock purchased on exercise of each type
        of Option. If an Option is not specifically designated as an Incentive Stock Option, or if an Option is designated as an Incentive Stock Option but some portion or all of the Option fails to qualify as an Incentive Stock Option under the applicable
        rules, then the Option (or portion thereof) will be a Nonstatutory Stock Option. The provisions of separate Options or SARs need not be identical; provided,
          however, that each Award Agreement will conform to (through incorporation of provisions hereof by reference in the applicable Award Agreement or otherwise) the substance of each of the following provisions:

      

      

      (a)          Term. Subject to the provisions of Section 4(b) regarding Ten Percent Stockholders, no Option or SAR will be exercisable after the expiration of
          ten (10) years from the date of its grant or such shorter period specified in the Award Agreement.

      

      

      (b)         Exercise Price. Subject to the provisions of Section 4(b) regarding Ten Percent Stockholders, the exercise or strike price of each Option or SAR
          will be not less than 100% of the Fair Market Value of the Common Stock subject to the Option or SAR on the date the Award is granted. Notwithstanding the foregoing, an Option or SAR may be granted with an exercise or strike price lower than 100%
          of the Fair Market Value of the Common Stock subject to the Award if such Award is granted pursuant to an assumption of or substitution for another option or stock appreciation right pursuant to a corporate transaction and in a manner consistent
          with the provisions of Section 409A of the Code and, if applicable, Section 424(a) of the Code. Each SAR will be denominated in shares of Common Stock equivalents.

      
        
          

      

      (c)          Purchase Price for Options. The purchase price of Common Stock acquired pursuant to the exercise of an Option may be paid, to the extent permitted
          by applicable law and as determined by the Board in its sole discretion, by any combination of the methods of payment set forth below. The Board will have the authority to grant Options that do not permit all of the following methods of payment
          (or otherwise restrict the ability to use certain methods) and to grant Options that require the consent of the Company to use a particular method of payment. The permitted methods of payment are as follows:

      

      

      (i)          by
          cash, check, bank draft or money order payable to the Company;

      

      

      (ii)         pursuant
          to a program developed under Regulation T as promulgated by the Federal Reserve Board that, prior to the issuance of the stock subject to the Option, 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;

      

      

      (iii)         by
          delivery to the Company (either by actual delivery or attestation) of shares of Common Stock;

      

      

      (iv)         if
          an Option is a Nonstatutory Stock Option, by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of Common Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that
          does not exceed the aggregate exercise price; provided, however, that the Company will accept a cash or other payment from the Participant to
          the extent of any remaining balance of the aggregate exercise price not satisfied by such reduction in the number of whole shares to be issued. Shares of Common Stock will no longer be subject to an Option and will not be exercisable thereafter
          to the extent that (A) shares issuable upon exercise are used to pay the exercise price pursuant to the “net exercise,” (B) shares are delivered to the Participant as a result of such exercise, and (C) shares are withheld to satisfy tax
          withholding obligations; or

      

      

      (v)          in
          any other form of legal consideration that may be acceptable to the Board and specified in the applicable Award Agreement.

      

      

      (d)         Exercise and Payment of a SAR. To exercise any outstanding SAR, the Participant must provide written notice of exercise to the Company in
          compliance with the provisions of the Stock Appreciation Right Agreement evidencing such SAR. The appreciation distribution payable on the exercise of a SAR will 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 SAR) of a number of shares of Common Stock equal to the number of Common Stock equivalents in which the Participant is vested under such SAR, and with respect to which the Participant is exercising the
          SAR on such date, over (B) the aggregate strike price of the number of Common Stock equivalents with respect to which the Participant is exercising the SAR on such date. The appreciation distribution may be paid in Common Stock, in cash, in any
          combination of the two or in any other form of consideration, as determined by the Board and contained in the Award Agreement evidencing such SAR.

      
        
          

      

      (e)          Transferability of Options and SARs. The Board may, in its sole discretion, impose such limitations on the transferability of Options and SARs as
          the Board will determine. In the absence of such a determination by the Board to the contrary, the following restrictions on the transferability of Options and SARs will apply:

      

      

      (i)          Restrictions on Transfer. An Option or SAR will not be transferable except by will or by the laws of descent and distribution (or pursuant to
          subsections (ii) and (iii) below), and will be exercisable during the lifetime of the Participant only by the Participant. The Board may permit transfer of the Option or SAR in a manner that is not prohibited by applicable tax and securities
          laws. Except as explicitly provided herein, neither an Option nor a SAR may be transferred for consideration.

      

      

      (ii)        Domestic Relations Orders. Subject to the approval of the Board or a duly authorized Officer, an Option or SAR may be transferred pursuant to the
          terms of a domestic relations order, official marital settlement agreement or other divorce or separation instrument as permitted by Treasury Regulation Section 1.421-1(b)(2). If an Option is an Incentive Stock Option, such Option may be deemed
          to be a Nonstatutory Stock Option as a result of such transfer.

      

      

      (iii)        Beneficiary Designation. Subject to the approval of the Board or a duly authorized Officer, a Participant may, by delivering written notice to the
          Company, in a form approved by the Company (or the designated broker), designate a third party who, on the death of the Participant, will thereafter be entitled to exercise the Option or SAR and receive the Common Stock or other consideration
          resulting from such exercise. In the absence of such a designation, upon the death of the Participant, the executor or administrator of the Participant’s estate will be entitled to exercise the Option or SAR and receive the Common Stock or other
          consideration resulting from such exercise. However, the Company may prohibit designation of a beneficiary at any time, including due to any conclusion by the Company that such designation would be inconsistent with the provisions of applicable
          laws.

      

      

      (f)          Vesting Generally. The total number of shares of Common Stock subject to an Option or SAR may vest and become exercisable in periodic installments
          that may or may not be equal. The Option or SAR may be subject to such other terms and conditions on the time or times when it may or may not be exercised (which may be based on the satisfaction of Performance Goals or other criteria) as the
          Board may deem appropriate. The vesting provisions of individual Options or SARs may vary. The provisions of this Section 5(f) are subject to any Option or SAR provisions governing the minimum number of shares of Common Stock as to which an
          Option or SAR may be exercised.

      

      

      (g)          Termination of Continuous Service. Except as otherwise provided in the
            applicable Award Agreement or other agreement between the Participant and the Company, if a Participant’s Continuous Service terminates (other than for Cause and other than upon the Participant’s death or Disability), the Participant may
            exercise his or her Option or SAR (to the extent that the Participant was entitled to exercise such Award as of the date of termination of Continuous Service) within the period of time ending on the earlier of (i) the date that is three (3)
            months following the termination of the Participant’s Continuous Service (or such longer or shorter period specified in the applicable Award Agreement, which period will not be less than thirty (30) days if necessary to comply with applicable
            laws unless such termination is for Cause) and (ii) the expiration of the term of the Option or SAR as set forth in the Award Agreement. If, after termination of Continuous Service, the Participant does not exercise his or her Option or SAR (as
            applicable) within the applicable time frame, the Option or SAR will terminate.

      

      

      (h)        Extension of Termination Date. Except as otherwise provided in the applicable Award Agreement or other written agreement between the Participant
          and the Company, if the exercise of an Option or SAR following the termination of the Participant’s Continuous Service (other than for Cause and other than upon the Participant’s death or Disability) would be prohibited at any time solely because
          the issuance of shares of Common Stock would violate the registration requirements under the Securities Act, then the Option or SAR will terminate on the earlier of (i) the expiration of a total period of time (that need not be consecutive) equal
          to the applicable post termination exercise period after the termination of the Participant’s Continuous Service during which the exercise of the Option or SAR would not be in violation of such registration requirements, and (ii) the expiration
          of the term of the Option or SAR as set forth in the applicable Award Agreement. In addition, unless otherwise provided in a Participant’s Award Agreement, if the sale of any Common Stock received on exercise of an Option or SAR following the
          termination of the Participant’s Continuous Service (other than for Cause) would violate the Company’s insider trading policy, then the Option or SAR will terminate on the earlier of (i) the expiration of a period of months (that need not be
          consecutive) equal to the applicable post-termination exercise period after the termination of the Participant’s Continuous Service during which the sale of the Common Stock received upon exercise of the Option or SAR would not be in violation of
          the Company’s insider trading policy, or (ii) the expiration of the term of the Option or SAR as set forth in the applicable Award Agreement.

      
        
          

      

      (i)          Disability of Participant. Except as otherwise provided in the applicable Award Agreement or other agreement between the Participant and the
          Company, if a Participant’s Continuous Service terminates as a result of the Participant’s Disability, the Participant may exercise his or her Option or SAR (to the extent that the Participant was entitled to exercise such Option or SAR as of the
          date of termination of Continuous Service), but only within such period of time ending on the earlier of (i) the date twelve (12) months following such termination of Continuous Service (or such longer or shorter period specified in the Award
          Agreement, which period will not be less than six (6) months if necessary to comply with applicable laws) and (ii) the expiration of the term of the Option or SAR as set forth in the Award Agreement. If, after termination of Continuous Service,
          the Participant does not exercise his or her Option or SAR within the applicable time frame, the Option or SAR (as applicable) will terminate.

      

      

      (j)        Death of Participant. Except as otherwise provided in the applicable Award Agreement or other agreement between the Participant and the Company, if (i) a Participant’s Continuous Service terminates as a result of the
            Participant’s death, or (ii) the Participant dies within the period (if any) specified in the Award Agreement for exercisability after the termination of the Participant’s Continuous Service for a reason other than death, then the Option or SAR
            may be exercised (to the extent the Participant was entitled to exercise such Option or SAR as of the date of death) by the Participant’s estate, by a person who acquired the right to exercise the Option or SAR by bequest or inheritance or by a
            person designated to exercise the Option or SAR upon the Participant’s death, 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 specified in the
            Award Agreement, which period will not be less than six (6) months if necessary to comply with applicable laws) and (ii) the expiration of the term of such Option or SAR as set forth in the Award Agreement. If, after the Participant’s death,
            the Option or SAR is not exercised within the applicable time frame, the Option or SAR (as applicable) will terminate.

      

      

      (k)        Termination for Cause. Except as explicitly provided otherwise in a Participant’s Award Agreement or other individual written agreement between the
          Company or any Affiliate and the Participant, if a Participant’s Continuous Service is terminated for Cause, the Option or SAR will terminate immediately upon such Participant’s termination of Continuous Service, and the Participant will be
          prohibited from exercising his or her Option or SAR from and after the time of such termination of Continuous Service.

      

      

      (l)          Non-Exempt Employees. If an Option or SAR is granted to an Employee who is a non-exempt employee for purposes of the Fair Labor Standards Act of
          1938, as amended, the Option or SAR will not be first exercisable for any shares of Common Stock until at least six (6) months following the date of grant of the Option or SAR (although the Award may vest prior to such date). Consistent with the
          provisions of the Worker Economic Opportunity Act, (i) if such non-exempt Employee dies or suffers a Disability, (ii) upon a Corporate Transaction in which such Option or SAR is not assumed, continued, or substituted, (iii) upon a Change in
          Control, or (iv) upon the Participant’s retirement (as such term may be defined in the Participant’s Award Agreement, in another agreement between the Participant and the Company, or, if no such definition, in accordance with the Company's then
          current employment policies and guidelines), the vested portion of any Options and SARs may be exercised earlier than six (6) months following the date of grant. The foregoing provision is intended to operate so that any income derived by a
          non-exempt employee in connection with the exercise or vesting of an Option or SAR will be exempt from his or her regular rate of pay. To the extent permitted and/or required for compliance with the Worker Economic Opportunity Act to ensure that
          any income derived by a non-exempt employee in connection with the exercise, vesting or issuance of any shares under any other Stock Award will be exempt from the employee’s regular rate of pay, the provisions of this Section 5(l) will apply to
          all Stock Awards and are hereby incorporated by reference into such Stock Award Agreements.

      
        
          

      

      6.          Provisions of Stock Awards Other than Options and SARs.

      

      

      (a)        Restricted Stock Awards. Each Restricted Stock Award Agreement will be in such form and will contain such terms and conditions as the Board deems
          appropriate. To the extent consistent with the Company’s bylaws, at the Board’s election, shares of Common Stock may be (i) held in book entry form subject to the Company’s instructions until any restrictions relating to the Restricted Stock
          Award lapse; or (ii) evidenced by a certificate, which certificate will be held in such form and manner as determined by the Board. The terms and conditions of Restricted Stock Award Agreements may change from time to time, and the terms and
          conditions of separate Restricted Stock Award Agreements need not be identical. Each Restricted Stock Award Agreement will conform to (through incorporation of the provisions hereof by reference in the agreement or otherwise) the substance of
          each of the following provisions:

      

      

      (i)        Consideration. A Restricted Stock Award may be awarded in consideration for (A) cash, check, bank draft or money order payable to the Company, (B)
          past or future services to the Company or an Affiliate, or (C) any other form of legal consideration that may be acceptable to the Board, in its sole discretion, and permissible under applicable law.

      

      

      (ii)          Vesting. Shares of Common Stock awarded under the Restricted Stock Award Agreement may be subject to forfeiture to the Company in accordance with
          a vesting schedule to be determined by the Board.

      

      

      (iii)        Termination of Participant’s Continuous Service. If a Participant’s Continuous Service terminates, the Company may receive through a forfeiture
          condition or a repurchase right any or all of the shares of Common Stock held by the Participant as of the date of termination of Continuous Service under the terms of the Restricted Stock Award Agreement.

      

      

      (iv)        Transferability. Rights to acquire shares of Common Stock under the Restricted Stock Award Agreement will be transferable by the Participant only
          upon such terms and conditions as are set forth in the Restricted Stock Award Agreement, as the Board will determine in its sole discretion, so long as Common Stock awarded under the Restricted Stock Award Agreement remains subject to the terms
          of the Restricted Stock Award Agreement.

      

      

      (v)          Dividends. A Restricted Stock Award Agreement may provide that any dividends paid on Restricted Stock will be subject to the same vesting and
          forfeiture restrictions as apply to the shares subject to the Restricted Stock Award to which they relate.

      
        
          

      

      (b)          Restricted Stock Unit Awards. Each Restricted Stock Unit Award Agreement will be in such form and will contain such terms and conditions as the
          Board deems appropriate. The terms and conditions of Restricted Stock Unit Award Agreements may change from time to time, and the terms and conditions of separate Restricted Stock Unit Award Agreements need not be identical. Each Restricted Stock
          Unit Award Agreement will conform to (through incorporation of the provisions hereof by reference in the Agreement or otherwise) the substance of each of the following provisions:

      

      

      (i)          Consideration. At the time of grant of a Restricted Stock Unit Award, the Board will determine the consideration, if any, to be paid by the
          Participant upon delivery of each share of Common Stock subject to the Restricted Stock Unit Award. The consideration to be paid (if any) by the Participant for each share of Common Stock subject to a Restricted Stock Unit Award may be paid in
          any form of legal consideration that may be acceptable to the Board, in its sole discretion, and permissible under applicable law.

      

      

      (ii)          Vesting. At the time of the grant of a Restricted Stock Unit Award, the Board may impose such restrictions on or conditions to the vesting of the
          Restricted Stock Unit Award as it, in its sole discretion, deems appropriate.

      

      

      (iii)        Payment. A Restricted Stock Unit Award may be settled by the delivery of shares of Common Stock, their cash equivalent, any combination thereof or
          in any other form of consideration, as determined by the Board and contained in the Restricted Stock Unit Award Agreement.

      

      

      (iv)        Additional Restrictions. At the time of the grant of a Restricted Stock Unit Award, the Board, as it deems appropriate, may impose such
          restrictions or conditions that delay the delivery of the shares of Common Stock (or their cash equivalent) subject to a Restricted Stock Unit Award to a time after the vesting of such Restricted Stock Unit Award.

      

      

      (v)         Dividend Equivalents. Dividend equivalents may be credited in respect of shares of Common Stock covered by a Restricted Stock Unit Award, as
          determined by the Board and contained in the Restricted Stock Unit Award Agreement. At the sole discretion of the Board, such dividend equivalents may be converted into additional shares of Common Stock covered by the Restricted Stock Unit Award
          in such manner as determined by the Board. Any additional shares covered by the Restricted Stock Unit Award credited by reason of such dividend equivalents will be subject to all of the same terms and conditions of the underlying Restricted Stock
          Unit Award Agreement to which they relate.

      

      

      (vi)       Termination of Participant’s Continuous Service. Except as otherwise provided in the applicable Restricted Stock Unit Award Agreement or other
          written agreement between a Participant and the Company or an Affiliate, such portion of the Restricted Stock Unit Award that has not vested will be forfeited upon the Participant’s termination of Continuous Service.

      

      

      (c)          Performance Awards.

      

      

      (i)          Performance Stock Awards. A Performance Stock Award is a Stock Award that is payable (including that may be granted, may vest or may be exercised)
          contingent upon the attainment during a Performance Period of certain Performance Goals. A Performance Stock Award may, but need not, require the Participant’s completion of a specified period of Continuous Service. The length of any Performance
          Period, the Performance Goals to be achieved during the Performance Period, and the measure of whether and to what degree such Performance Goals have been attained will be conclusively determined by the Board or Committee, in its sole discretion.
          In addition, to the extent permitted by applicable law and the applicable Award Agreement, the Board or the Committee may determine that cash may be used in payment of Performance Stock Awards.

      

      

      (ii)         Performance Cash Awards. A Performance Cash Award is a cash award that is payable contingent upon the attainment during a Performance Period of
          certain Performance Goals. A Performance Cash Award may also require the completion of a specified period of Continuous Service. At the time of grant of a Performance Cash Award, the length of any Performance Period, the Performance Goals to be
          achieved during the Performance Period, and the measure of whether and to what degree such Performance Goals have been attained will be conclusively determined by the Board or Committee, in its sole discretion. The Board or Committee may specify
          the form of payment of Performance Cash Awards, which may be cash or other property, or may provide for a Participant to have the option for his or her Performance Cash Award, or such portion thereof as the Board may specify, to be paid in whole
          or in part in cash or other property.

      
        
          

      

      (iii)       Board Discretion. The Board retains the discretion to adjust or eliminate the compensation or economic benefit due upon attainment of Performance
          Goals and to define the manner of calculating the Performance Criteria it selects to use for a Performance Period. Partial achievement of the specified criteria may result in the payment or vesting corresponding to the degree of achievement as
          specified in the Stock Award Agreement or the written terms of a Performance Cash Award.

      

      

      (d)        Other Stock Awards. Other forms of Stock Awards valued in whole or in part by reference to, or otherwise based on, Common Stock, including the
          appreciation in value thereof (e.g., options or stock rights with an exercise price or strike price less than 100% of the Fair Market Value of the Common Stock at the time of grant) may be granted either alone or in addition to Stock Awards
          provided for under Section 5 and the preceding provisions of this Section 6. Subject to the provisions of the Plan, the Board will have sole and complete authority to determine the persons to whom and the time or times at which such Other Stock
          Awards will be granted, the number of shares of Common Stock (or the cash equivalent thereof) to be granted pursuant to such Other Stock Awards and all other terms and conditions of such Other Stock Awards.

      

      

      7.          Covenants of the Company.

      

      

      (a)          Availability of Shares. The Company will keep available at all times the number of shares of Common Stock reasonably required to satisfy
          then-outstanding Stock Awards.

      

      

      (b)         Securities Law Compliance. The Company will seek to obtain from each regulatory commission or agency having jurisdiction over the Plan, as
          necessary, such authority as may be required to grant Stock Awards and to issue and sell shares of Common Stock upon exercise or vesting of the Stock Awards; provided, however, that this undertaking will not require the Company to register under the Securities Act or other securities or applicable laws, the Plan, any Stock Award or any Common Stock issued or issuable pursuant to any
          such Stock Award. If, after reasonable efforts and at a reasonable cost, the Company is unable to obtain from any such regulatory commission or agency the authority that counsel for the Company deems necessary or advisable for the lawful issuance
          and sale of Common Stock under the Plan, the Company will be relieved from any liability for failure to issue and sell Common Stock upon exercise or vesting of such Stock Awards unless and until such authority is obtained. A Participant will not
          be eligible for the grant of an Award or the subsequent issuance of cash or Common Stock pursuant to the Award if such grant or issuance would be in violation of any applicable securities law.

      

      

      (c)          No Obligation to Notify or Minimize Taxes. The Company will have no duty or obligation to any Participant to advise such holder as to the tax
          treatment or time or manner of exercising such Stock Award. Furthermore, the Company will have no duty or obligation to warn or otherwise advise such holder of a pending termination or expiration of an Award or a possible period in which the
          Award may not be exercised. The Company has no duty or obligation to minimize the tax consequences of an Award to the holder of such Award.

      
        
          

      

      8.          Miscellaneous.

      

      

      (a)          Use of Proceeds from Sales of Common Stock. Proceeds from the sale of shares of Common Stock pursuant to Stock Awards will constitute general
          funds of the Company.

      

      

      (b)          Corporate Action Constituting Grant of Awards. Corporate action constituting a grant by the Company of an Award to any Participant will be deemed
          completed as of the date of such corporate action, unless otherwise determined by the Board, regardless of when the instrument, certificate, or letter evidencing the Award is communicated to, or actually received or accepted by, the Participant.
          In the event that the corporate records (e.g., Board consents, resolutions or minutes) documenting the corporate action approving the grant contain terms (e.g., exercise price, vesting schedule or number of shares) that are inconsistent with
          those in the Award Agreement or related grant documents as a result of a clerical error in the papering of the Award Agreement or related grant documents, the corporate records will control and the Participant will have no legally binding right
          to the incorrect term in the Award Agreement or related grant documents.

      

      

      (c)          Stockholder Rights. No Participant will be deemed to be the holder of, or to have any of the rights of a holder with respect to, any shares of
          Common Stock subject to an Award unless and until (i) such Participant has satisfied all requirements for exercise of, or the issuance of shares of Common Stock under, the Award pursuant to its terms, and (ii) the issuance of the Common Stock
          subject to such Award has been entered into the books and records of the Company.

      

      

      (d)         No Employment or Other Service Rights. Nothing in the Plan, any Award Agreement or any other instrument executed thereunder or in connection with
          any Award granted pursuant thereto will confer upon any Participant any right to continue to serve the Company or an Affiliate in the capacity in effect at the time the Award was granted or will affect the right of the Company or an Affiliate to
          terminate (i) the employment of an Employee with or without notice and with or without cause, (ii) the service of a Consultant pursuant to the terms of such Consultant’s agreement with the Company or an Affiliate, or (iii) the service of a
          Director pursuant to the bylaws of the Company or an Affiliate, and any applicable provisions of the corporate law of the state or foreign jurisdiction in which the Company or the Affiliate is domiciled or incorporated, as the case may be.

      

      

      (e)          Change in Time Commitment. In the event a Participant’s regular level of time commitment in the performance of his or her services for the Company
          and any Affiliates is reduced (for example, and without limitation, if the Participant is an Employee of the Company and the Employee has a change in status from a full-time Employee to a part-time Employee or takes an extended leave of absence)
          after the date of grant of any Award to the Participant, the Board has the right in its sole discretion to (x) make a corresponding reduction in the number of shares or cash amount subject to any portion of such Award that is scheduled to vest or
          become payable after the date of such change in time commitment, and (y) in lieu of or in combination with such a reduction, extend the vesting or payment schedule applicable to such Award. In the event of any such reduction, the Participant will
          have no right with respect to any portion of the Award that is so reduced or extended.

      

      

      (f)          Incentive Stock Option Limitations. To the extent that the aggregate Fair Market Value (determined at the time of grant) of Common Stock with
          respect to which Incentive Stock Options are exercisable for the first time by any Optionholder during any calendar year (under all plans of the Company and any Affiliates) exceeds $100,000 (or such other limit established in the Code) or
          otherwise does not comply with the rules governing Incentive Stock Options, the Options or portions thereof that exceed such limit (according to the order in which they were granted) or otherwise do not comply with such rules will be treated as
          Nonstatutory Stock Options, notwithstanding any contrary provision of the applicable Option Agreement(s).

      
        
          

      

      (g)        Investment Assurances. The Company may require a Participant, as a condition of exercising or acquiring Common Stock under any Award, (i) to give
          written assurances satisfactory to the Company as to the Participant’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 such Participant is capable of evaluating, alone or together with the purchaser representative, the merits and risks of exercising the Award; and (ii) to give written assurances satisfactory
          to the Company stating that the Participant is acquiring Common Stock subject to the Award for the Participant’s own account and not with any present intention of selling or otherwise distributing the Common Stock. The foregoing requirements, and
          any assurances given pursuant to such requirements, will be inoperative if (A) the issuance of the shares upon the exercise or acquisition of Common Stock under the Stock Award has been registered under a then currently effective registration
          statement under the Securities Act, or (B) 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 Common Stock.

      

      

      (h)         Withholding Obligations. Unless prohibited by the terms of an Award Agreement, the Company may, in its sole discretion, satisfy any federal, state
          or local tax withholding obligation relating to an Award by any of the following means or by a combination of such means: (i) causing the Participant to tender a cash payment; (ii) withholding shares of Common Stock from the shares of Common
          Stock issued or otherwise issuable to the Participant in connection with the Stock Award; provided, however, that no shares of Common Stock
          are withheld with a value exceeding the maximum amount of tax required to be withheld by law (or such lesser amount as may be necessary to avoid classification of the Stock Award as a liability for financial accounting purposes); (iii)
          withholding cash from an Award settled in cash; (iv) withholding payment from any amounts otherwise payable to the Participant; or (v) by such other method as may be set forth in the Award Agreement.

      

      

      (i)          Electronic Delivery. Any reference herein to a “written” agreement or document will include any agreement or document delivered electronically,
          filed publicly at www.sec.gov (or any successor website thereto) or posted on the Company’s intranet (or other shared electronic medium controlled by the Company to which the Participant has access).

      

      

      (j)          Deferrals. To the extent permitted by applicable law, the Board, in its sole discretion, may determine that the delivery of Common Stock or the
          payment of cash, upon the exercise, vesting or settlement of all or a portion of any Award may be deferred and may establish programs and procedures for deferral elections to be made by Participants. Deferrals by Participants will be made in
          accordance with Section 409A of the Code. Consistent with Section 409A of the Code, the Board may provide for distributions while a Participant is still an employee or otherwise providing services to the Company. The Board is authorized to make
          deferrals of Awards and determine when, and in what annual percentages, Participants may receive payments, including lump sum payments, following the Participant’s termination of Continuous Service, and implement such other terms and conditions
          consistent with the provisions of the Plan and in accordance with applicable law.

      

      

      (k)         Clawback/Recovery. All Awards granted under the Plan will be subject to recoupment in accordance with any clawback policy that the Company is
          required to adopt pursuant to the listing standards of any national securities exchange or association on which the Company’s securities are listed or as is otherwise required by the Dodd-Frank Wall Street Reform and Consumer Protection Act or
          other applicable law. In addition, the Board may impose such other clawback, recovery or recoupment provisions in an Award Agreement as the Board determines necessary or appropriate, including but not limited to a reacquisition right in respect
          of previously acquired shares of Common Stock or other cash or property upon the occurrence of an event constituting Cause. No recovery of compensation under such a clawback policy will be an event giving rise to a right to voluntary terminate
          employment upon a “resignation for good reason,” or for a “constructive termination” or any similar term under any plan of or agreement with the Company.

      
        
          

      

      (l)         Compliance with Section 409A of the Code. Unless otherwise expressly provided for in an Award Agreement, the Plan and Award Agreements will be
          interpreted to the greatest extent possible in a manner that makes the Plan and the Awards granted hereunder exempt from Section 409A of the Code, and, to the extent not so exempt, in compliance with Section 409A of the Code. If the Board
          determines that any Award granted hereunder is not exempt from and is therefore subject to Section 409A of the Code, the Award Agreement evidencing such Award will incorporate the terms and conditions necessary to avoid the consequences specified
          in Section 409A(a)(1) of the Code, and to the extent an Award Agreement is silent on terms necessary for compliance, such terms are hereby incorporated by reference into the Award Agreement. Notwithstanding anything to the contrary in this Plan
          (and unless the Award Agreement specifically provides otherwise), if the shares of Common Stock are publicly traded, and if a Participant holding an Award that constitutes “deferred compensation” under Section 409A of the Code is a “specified
          employee” for purposes of Section 409A of the Code, no distribution or payment of any amount that is due because of a “separation from service” (as defined in Section 409A of the Code without regard to alternative definitions thereunder) will be
          issued or paid before the date that is six months following the date of such Participant’s “separation from service” or, if earlier, the date of the Participant’s death, unless such distribution or payment can be made in a manner that complies
          with Section 409A of the Code, and any amounts so deferred will be paid in a lump sum on the day after such six month period elapses, with the balance paid thereafter on the original schedule.

      

      

      9.          Adjustments upon Changes in Common Stock; Other Corporate Events.

      

      

      (a)          Capitalization Adjustments. In the event of a Capitalization Adjustment, the Board will appropriately and proportionately adjust: (i) the class(es)
          and maximum number of securities subject to the Plan pursuant to Section 3(a), (ii) the class(es) and maximum number of securities by which the share reserve is to increase automatically each year pursuant to Section 3(a), (iii) the class(es) and
          maximum number of securities that may be issued pursuant to the exercise of Incentive Stock Options pursuant to Section 3(c), (iv) the class(es) and maximum number of securities that may be awarded to any Non-Employee Director pursuant to Section
          3(d), and (v) the class(es) and number of securities and price per share of stock subject to outstanding Stock Awards. The Board will make such adjustments, and its determination will be final, binding and conclusive.

      

      

      (b)         Dissolution. Except as otherwise provided in the Stock Award Agreement, in the event of a Dissolution of the Company, all outstanding Stock Awards
          (other than Stock Awards consisting of vested and outstanding shares of Common Stock not subject to a forfeiture condition or the Company’s right of repurchase) will terminate immediately prior to the completion of such Dissolution, and the
          shares of Common Stock subject to the Company’s repurchase rights or subject to a forfeiture condition may be repurchased or reacquired by the Company notwithstanding the fact that the holder of such Stock Award is providing Continuous Service; provided, however, that the Board may, in its sole discretion, cause some or all Stock Awards to become fully vested, exercisable and/or no longer
          subject to repurchase or forfeiture (to the extent such Stock Awards have not previously expired or terminated) before the Dissolution is completed but contingent on its completion.

      
        
          

      

      (c)          Transaction. The following provisions will apply to Stock Awards in the event of a Transaction unless otherwise provided in the instrument
          evidencing the Stock Award or any other written agreement between the Company or any Affiliate and the Participant or unless otherwise expressly provided by the Board at the time of grant of a Stock Award. In the event of a Transaction, then,
          notwithstanding any other provision of the Plan, the Board may take one or more of the following actions with respect to Stock Awards, contingent upon the closing or completion of the Transaction:

      

      

      (i)          arrange
          for the surviving corporation or acquiring corporation (or the surviving or acquiring corporation’s parent company) to assume or continue the Stock Award or to substitute a similar stock award for the Stock Award (including, but not limited to,
          an award to acquire the same consideration paid to the stockholders of the Company pursuant to the Transaction);

      

      

      (ii)       arrange
          for the assignment of any reacquisition or repurchase rights held by the Company in respect of Common Stock issued pursuant to the Stock Award to the surviving corporation or acquiring corporation (or the surviving or acquiring corporation’s
          parent company);

      

      

      (iii)       accelerate
          the vesting, in whole or in part, of the Stock Award (and, if applicable, the time at which the Stock Award may be exercised) to a date prior to the effective time of such Transaction as the Board determines (or, if the Board does not determine
          such a date, to the date that is five days prior to the effective date of the Transaction), with such Stock Award terminating if not exercised (if applicable) at or prior to the effective time of the Transaction; provided, however, that the Board may require Participants to complete and deliver to the Company a notice of exercise before the effective date of a Transaction, which
          exercise is contingent upon the effectiveness of such Transaction;

      

      

      (iv)         arrange
          for the lapse, in whole or in part, of any reacquisition or repurchase rights held by the Company with respect to the Stock Award;

      

      

      (v)        cancel
          or arrange for the cancellation of the Stock Award, to the extent not vested or not exercised prior to the effective time of the Transaction, in exchange for such cash consideration, if any, as the Board, in its sole discretion, may consider
          appropriate; and

      

      

      (vi)        make
          a payment, in such form as may be determined by the Board equal to the excess, if any, of (A) the value of the property the Participant would have received upon the exercise of the Stock Award immediately prior to the effective time of the
          Transaction, over (B) any exercise price payable by such holder in connection with such exercise. For clarity, this payment may be $0 if the value of the property is equal to or less than the exercise price. Payments under this provision may be
          delayed to the same extent that payment of consideration to the holders of the Company’s Common Stock in connection with the Transaction is delayed as a result of escrows, earn outs, holdbacks or any other contingencies.

      

      

      The Board need not take the same action or actions with respect to all Stock Awards or portions thereof or with respect to all
        Participants. The Board may take different actions with respect to the vested and unvested portions of a Stock Award.

      

      

      (d)          Change in Control. A Stock Award may be subject to additional acceleration of vesting and exercisability upon or after a Change in Control as may
          be provided in the Stock Award Agreement for such Stock Award or as may be provided in any other written agreement between the Company or any Affiliate and the Participant, but in the absence of such provision, no such acceleration will
          automatically occur.

      

      

      10.          Plan Term; Earlier Termination or Suspension of the Plan.

      

      

      The Board may suspend or terminate the Plan at any time. No Incentive Stock Options may be granted after the tenth anniversary of the
        earlier of (i) the date the Plan is adopted by the Board (the “Adoption Date”), or (ii) the date the Plan is approved by the
        stockholders of the Company. No Awards may be granted under the Plan while the Plan is suspended or after it is terminated.

      
        
          

      

      11.          Existence of the Plan; Timing of First Grant or Exercise.

      

      

      The Plan will come into existence on the Adoption Date; provided, however, that no Stock Award may be granted prior to the IPO Date. In addition, no Stock Award will be exercised (or, in the case of a Restricted Stock Award, Restricted Stock Unit Award, Performance Share
        Award, or Other Stock Award, no Stock Award will be granted) and no Performance Cash Award will be settled unless and until the Plan has been approved by the stockholders of the Company, which approval will be within 12 months after the date the
        Plan is adopted by the Board.

      

      

      12.          Choice of Law.

      

      

      The laws of the State of Delaware will govern all questions concerning the construction, validity and interpretation of this Plan,
        without regard to that state’s conflict of laws rules.

      

      

      13.          Definitions. As used in the Plan, the following definitions will apply to the capitalized terms indicated below:

      

      

      (a)          “Affiliate” means, at the time of determination, any “parent” or “subsidiary” of the Company as such terms are defined in Rule
          405 of the Securities Act. The Board will have the authority to determine the time or times at which “parent” or “subsidiary” status is determined within the foregoing definition.

      

      

      (b)          “Award” means a Stock Award or a Performance Cash Award.

      

      

      (c)          “Award Agreement” means a written agreement between the Company and a Participant evidencing the terms and conditions of an
          Award.

      

      

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

      

      

      (e)          “Capital Stock” means each and every class of common stock of the Company, regardless of the number of votes per share.

      

      

      (f)          “Capitalization Adjustment” means any change that is made in, or other events that occur with respect to, the Common Stock
          subject to the Plan or subject to any Stock Award after the Adoption Date without the receipt of consideration by the Company through merger, consolidation, reorganization, recapitalization, reincorporation, stock dividend, dividend in property
          other than cash, large nonrecurring cash dividend, stock split, reverse stock split, liquidating dividend, combination of shares, exchange of shares, change in corporate structure or any similar equity restructuring transaction, as that term is
          used in Statement of Financial Accounting Standards Board Accounting Standards Codification Topic 718 (or any successor thereto). Notwithstanding the foregoing, the conversion of any convertible securities of the Company will not be treated as a
          Capitalization Adjustment.

      

      

      (g)          “Cause” shall
          have the meaning ascribed to such term in any written agreement between the Participant and the Company defining such term and, in the absence of such agreement, such term means, with respect to a Participant, the occurrence of any of the
          following events:  (i) such Participant’s commission of any felony or any crime involving fraud, dishonesty or moral turpitude under the laws of the United States or any state thereof; (ii) such Participant’s attempted commission of, or
          participation in, a fraud or act of dishonesty against the Company; (iii) such Participant’s intentional, material violation of any contract or agreement between the Participant and the Company or of any statutory duty owed to the Company; (iv)
          such Participant’s unauthorized use or disclosure of the Company’s confidential information or trade secrets; or (v) such Participant’s gross misconduct. The determination that a termination of the Participant’s Continuous Service is either for
          Cause or without Cause shall be made by the Company, in its sole discretion. Any determination by the Company that the Continuous Service of a Participant was terminated with or without Cause for the purposes of outstanding Awards held by such
          Participant shall have no effect upon any determination of the rights or obligations of the Company or such Participant for any other purpose.

      
        
          

      

      (h)          “Change in Control” means the occurrence, in a single transaction or in a series of related transactions, of any one or more of
          the following events:

      

      

      (i)          any
          Exchange Act Person becomes the Owner, directly or indirectly, of securities of the Company representing more than 50% of the combined voting power of the Company’s then outstanding securities other than by virtue of a merger, consolidation or
          similar transaction. Notwithstanding the foregoing, a Change in Control will not be deemed to occur (A) on account of the acquisition of securities of the Company directly from the Company, (B) on account of the acquisition of securities of the
          Company by an investor, any affiliate thereof or any other Exchange Act Person that acquires the Company’s securities in a transaction or series of related transactions the primary purpose of which is to obtain financing for the Company through
          the issuance of equity securities, (C) on account of the acquisition of securities of the Company by any individual who is, on the IPO Date, either an executive officer or a Director (either, an “IPO Investor”) and/or any entity in which an IPO Investor has a direct or indirect interest (whether in the form of voting rights or participation in profits or capital
          contributions) of more than 50% (collectively, the “IPO Entities”) or on account of the IPO Entities continuing to hold
          shares that come to represent more than 50% of the combined voting power of the Company’s then outstanding securities as a result of the conversion of any class of the Company’s securities into another class of the Company’s securities having a
          different number of votes per share pursuant to the conversion provisions set forth in the Company’s Amended and Restated Certificate of Incorporation; or (D) solely because the level of Ownership held by any Exchange Act Person (the “Subject Person”) exceeds the designated percentage threshold of the outstanding voting securities as a result of a repurchase
          or other acquisition of voting securities by the Company reducing the number of shares outstanding, provided that if a Change in Control would occur (but for the operation of this sentence) as a result of the acquisition of voting securities by
          the Company, and after such share acquisition, the Subject Person becomes the Owner of any additional voting securities that, assuming the repurchase or other acquisition had not occurred, increases the percentage of the then outstanding voting
          securities Owned by the Subject Person over the designated percentage threshold, then a Change in Control will be deemed to occur;

      

      

      (ii)        there
          is consummated a merger, consolidation or similar transaction involving (directly or indirectly) the Company and, immediately after the consummation of such merger, consolidation or similar transaction, the stockholders of the Company immediately
          prior thereto do not Own, directly or indirectly, either (A) outstanding voting securities representing more than 50% of the combined outstanding voting power of the surviving Entity in such merger, consolidation or similar transaction or (B)
          more than 50% of the combined outstanding voting power of the parent of the surviving Entity in such merger, consolidation or similar transaction, in each case in substantially the same proportions as their Ownership of the outstanding voting
          securities of the Company immediately prior to such transaction; provided, however, that a merger, consolidation or similar transaction will
          not constitute a Change in Control under this prong of the definition if the outstanding voting securities representing more than 50% of the combined voting power of the surviving Entity or its parent are owned by the IPO Entities;

      

      

      (iii)        there
          is consummated a sale, lease, exclusive license or other disposition of all or substantially all of the consolidated assets of the Company and its Subsidiaries, other than a sale, lease, license or other disposition of all or substantially all of
          the consolidated assets of the Company and its Subsidiaries to an Entity, more than 50% of the combined voting power of the voting securities of which are Owned by stockholders of the Company in substantially the same proportions as their
          Ownership of the outstanding voting securities of the Company immediately prior to such sale, lease, license or other disposition; provided, however,
          that a sale, lease, exclusive license or other disposition of all or substantially all of the consolidated assets of the Company and its Subsidiaries will not constitute a Change in Control under this prong of the definition if the outstanding
          voting securities representing more than 50% of the combined voting power of the acquiring Entity or its parent are owned by the IPO Entities;

      
        
          

      

      (iv)        the
          stockholders of the Company approve or the Board approves a plan of complete dissolution or liquidation of the Company, or a complete dissolution or liquidation of the Company will otherwise occur, except for a liquidation into a parent
          corporation; or

      

      

      (v)         individuals
          who, on the IPO Date, are members of the Board (the “Incumbent Board”) cease for any reason to constitute at least a
          majority of the members of the Board;  provided, however, that if the appointment or election (or nomination for election) of any new Board
          member was approved or recommended by a majority vote of the members of the Incumbent Board then still in office, such new member will, for purposes of this Plan, be considered as a member of the Incumbent Board.

      

      

      Notwithstanding the foregoing definition or any other provision of the Plan, (A) the term Change in Control will not include a sale of
        assets, merger or other transaction effected exclusively for the purpose of changing the domicile of the Company and (B) the definition of Change in Control (or any analogous term) in an individual written agreement between the Company or any
        Affiliate and the Participant will supersede the foregoing definition with respect to Awards subject to such agreement; provided, however, that
        if no definition of Change in Control or any analogous term is set forth in such an individual written agreement, the foregoing definition will apply.

      

      

      (i)          “Code” means the Internal Revenue Code of 1986, as amended, including any applicable regulations and guidance thereunder.

      

      

      (j)          “Committee” means a committee of one or more Directors to whom authority has been delegated by the Board in accordance with
          Section 2(c).

      

      

      (k)          “Common Stock” means, as of the IPO Date, the common stock of the Company, having one vote per share.

      

      

      (l)          “Company” means Castle Biosciences, Inc., a Delaware corporation.

      

      

      (m)          “Consultant” means any person, including an advisor, who is (i) engaged by the Company or an Affiliate to render consulting or
          advisory services and is compensated for such services, or (ii) serving as a member of the board of directors of an Affiliate and is compensated for such services. However, service solely as a Director, or payment of a fee for such service, will
          not cause a Director to be considered a “Consultant” for purposes of the Plan. Notwithstanding the foregoing, a person is treated as a Consultant under this Plan only if a Form S-8 Registration Statement under the Securities Act is available to
          register either the offer or the sale of the Company’s securities to such person.

      

      

      (n)          “Continuous Service” means that the Participant’s service with the Company or an Affiliate, whether as an Employee, Director or
          Consultant, is not interrupted or terminated. A change in the capacity in which the Participant renders service to the Company or an Affiliate as an Employee, Consultant or Director or a change in the entity for which the Participant renders such
          service, provided that there is no interruption or termination of the Participant’s service with the Company or an Affiliate, will not terminate a Participant’s Continuous Service; provided, however, that if the Entity for which a Participant is rendering services ceases to
          qualify as an Affiliate, as determined by the Board, in its sole discretion, such Participant’s Continuous Service will be considered to have terminated on the date such Entity ceases to qualify as an Affiliate. To the extent permitted by law,
          the Board or the chief executive officer of the Company, in that party’s sole discretion, may determine whether Continuous Service will be considered interrupted in the case of (i) any leave of absence approved by the Board or chief executive
          officer, including sick leave, military leave or any other personal leave, or (ii) transfers between the Company, an Affiliate, or their successors. Notwithstanding the foregoing, a leave of absence will be treated as Continuous Service for
          purposes of vesting in an Award only to such extent as may be provided in the Company’s leave of absence policy, in the written terms of any leave of absence agreement or policy applicable to the Participant, or as otherwise required by law.

      
        
          

      

      (o)          “Corporate Transaction” means the consummation, in a single transaction or in a series of related transactions, of any one or
          more of the following events:

      

      

      (i)          a
          sale or other disposition of all or substantially all, as determined by the Board, in its sole discretion, of the consolidated assets of the
          Company and its Subsidiaries;

      

      

      (ii)          a
          sale or other disposition of more than 50% of the outstanding securities of the Company;

      

      

      (iii)        a
          merger, consolidation or similar transaction following which the Company is not the surviving corporation; or

      

      

      (iv)         a
          merger, consolidation or similar transaction following which the Company is the surviving corporation but the shares of Common Stock outstanding immediately preceding the merger, consolidation or similar transaction are converted or exchanged by
          virtue of the merger, consolidation or similar transaction into other property, whether in the form of securities, cash or otherwise.

      

      

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

      

      

      (q)          “Disability” means, with respect to a Participant, the inability of such Participant to engage in any substantial gainful
          activity by reason of any medically determinable physical or mental impairment that can be expected to result in death or that has lasted or can be expected to last for a continuous period of not less than 12 months, as provided in Sections
          22(e)(3) and 409A(a)(2)(c)(i) of the Code, and will be determined by the Board on the basis of such medical evidence as the Board deems warranted under the circumstances.

      

      

      (r)          “Dissolution” means when the Company, after having executed a certificate of dissolution with the State of Delaware (or other
          applicable state), has completely wound up its affairs. Conversion of the Company into a Limited Liability Company (or any other pass-through entity) will not be considered a “Dissolution” for purposes of the Plan.

      

      

      (s)          “Employee” means any person employed by the Company or an Affiliate. However, service solely as a Director, or payment of a fee
          for such services, will not cause a Director to be considered an “Employee” for purposes of the Plan.

      

      

      (t)          “Entity” means a corporation, partnership, limited liability company or other entity.

      
        
          

      

      (u)          “Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder.

      

      

      (v)        “Exchange Act Person” means any natural person, Entity or “group” (within the meaning of Section 13(d) or 14(d) of the Exchange Act), except that “Exchange Act Person” will not include (i) the Company or any Subsidiary of the Company, (ii) any
          employee benefit plan of the Company or any Subsidiary of the Company or any trustee or other fiduciary holding securities under an employee benefit plan of the Company or any Subsidiary of the Company, (iii) an underwriter temporarily holding
          securities pursuant to a registered public offering of such securities, (iv) an Entity Owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their Ownership of stock of the Company; or (v) any
          natural person, Entity or “group” (within the meaning of Section 13(d) or 14(d) of the Exchange Act) that, as of the IPO Date, is the Owner, directly or indirectly, of securities of the Company representing more than 50% of the combined voting
          power of the Company’s then outstanding securities.

      

      

      (w)          “Fair Market Value” means, as of any date, the value of the Common Stock determined as follows:

      

      

      (i)          If
          the Common Stock is listed on any established stock exchange or traded on any established market, the Fair Market Value of a share of Common Stock will be, unless otherwise determined by the Board, the closing sales price for such stock as quoted
          on such exchange or market (or the exchange or market with the greatest volume of trading in the Common Stock) on the date of determination, as reported in a source the Board deems reliable.

      

      

      (ii)          Unless
          otherwise provided by the Board, if there is no closing sales price for the Common Stock on the date of determination, then the Fair Market Value will be the closing selling price on the last preceding date for which such quotation exists.

      

      

      (iii)         In
          the absence of such markets for the Common Stock, the Fair Market Value will be determined by the Board in good faith and in a manner that complies with Sections 409A and 422 of the Code.

      

      

      (x)          “Incentive Stock Option” means an option granted pursuant to Section 5 of the Plan that is intended to be, and qualifies as, an
          “incentive stock option” within the meaning of Section 422 of the Code.

      

      

      (y)          “IPO Date” means the date of the underwriting agreement between the Company and the underwriter(s) managing the initial public
          offering of the Common Stock, pursuant to which the Common Stock is priced for the initial public offering.

      

      

      (z)          “Non-Employee Director” means
          a Director who either (i) is not a current employee or officer of the Company or an Affiliate, does not receive compensation, either directly or indirectly, from the Company or an Affiliate 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 for which disclosure would be required under Item 404(a) of Regulation S-K, and is not engaged in a business
          relationship for which disclosure would be required pursuant to Item 404(b) of Regulation S-K; or (ii) is otherwise considered a “non-employee director” for purposes of Rule 16b-3.

      

      

      (aa)        “Nonstatutory Stock Option” means any Option granted pursuant to Section 5 of the Plan that does not qualify as an Incentive
          Stock Option.

      
        
          

      

      (bb)        “Officer” means a person who is an officer of the Company within the meaning of Section 16 of the Exchange Act.

      

      

      (cc)        “Option” means an Incentive Stock Option or a Nonstatutory Stock Option to purchase shares of Common Stock granted pursuant to
          the Plan.

      

      

      (dd)        “Option Agreement” means a written agreement between the Company and an Optionholder evidencing the terms and conditions of an
          Option grant. Each Option Agreement will be subject to the terms and conditions of the Plan.

      

      

      (ee)        “Optionholder” means a person to whom an Option is granted pursuant to the Plan or, if applicable, such other person who holds
          an outstanding Option.

      

      

      (ff)          “Other Stock Award” means an award based in whole or in part by reference to the Common Stock which is granted pursuant to the
          terms and conditions of Section 6(d).

      

      

      (gg)       “Other Stock Award Agreement” means a written agreement between the Company and a holder of an Other Stock Award evidencing the terms and conditions of an Other Stock Award grant. Each Other Stock Award Agreement will be subject to the terms and
          conditions of the Plan.

      

      

      (hh)      “Own,” “Owned,” “Owner,” “Ownership” means a
          person or Entity will be deemed to “Own,” to have “Owned,” to be the “Owner” of, or to have acquired “Ownership” of securities if such person or Entity, directly or indirectly, through any contract, arrangement, understanding, relationship or
          otherwise, has or shares voting power, which includes the power to vote or to direct the voting, with respect to such securities.

      

      

      (ii)          “Participant” means a person to whom an Award is granted pursuant to the Plan or, if applicable, such other person who holds an
          outstanding Stock Award.

      

      

      (jj)          “Performance Cash Award” means an award of cash granted pursuant to the terms and conditions of Section 6(c)(ii).

      

      

      (kk)        “Performance Criteria” means the one or more criteria that the Board will select for purposes of establishing the Performance
          Goals for a Performance Period. The Performance Criteria that will be used to establish such Performance Goals may be based on any one of, or combination of, the following as determined by the Board: (i) sales; (ii) revenues; (iii) assets; (iv)
          expenses; (v) market penetration or expansion; (vi) earnings from operations; (vii) earnings before or after deduction for all or any portion of interest, taxes, depreciation, amortization, incentives, service fees or extraordinary or special
          items, whether or not on a continuing operations or an aggregate or per share basis; (viii) net income or net income per common share (basic or diluted); (ix) return on equity, investment, capital or assets; (x) one or more operating ratios; (xi)
          borrowing levels, leverage ratios or credit rating; (xii) market share; (xiii) capital expenditures; (xiv) cash flow, free cash flow, cash flow return on investment, or net cash provided by operations; (xv) stock price, dividends or total
          stockholder return; (xvi) development of new technologies or products; (xvii) sales of particular products or services; (xviii) economic value created or added; (xix) operating margin or profit margin; (xx) customer acquisition or retention;
          (xxi) raising or refinancing of capital; (xxii) successful hiring of key individuals; (xxiii) resolution of significant litigation; (xxiv) acquisitions and divestitures (in whole or in part); (xxv) joint ventures and strategic alliances; (xxvi)
          spin-offs, split-ups and the like; (xxvii) reorganizations; (xxviii) recapitalizations, restructurings, financings (issuance of debt or equity) or refinancings; (xxix) or strategic business criteria, consisting of one or more objectives based on
          the following goals: achievement of timely development, design management or enrollment, meeting specified market penetration or value added, payor acceptance, patient adherence, peer reviewed publications, issuance of new patents, establishment
          of or securing of licenses to intellectual property, product development or introduction (including, without limitation, any clinical trial accomplishments, regulatory or other filings, approvals or milestones, discovery of novel products,
          maintenance of multiple products in pipeline, product launch or other product development milestones), geographic business expansion, cost targets, cost reductions or savings, customer satisfaction, operating efficiency, acquisition or retention,
          employee satisfaction, information technology, corporate development (including, without limitation, licenses, innovation, research or establishment of third party collaborations), manufacturing or process development, legal compliance or risk
          reduction, patent application or issuance goals, or goals relating to acquisitions, divestitures or other business combinations (in whole or in part), joint ventures or strategic alliances; and (xxx) other measures of performance selected by the
          Board.

      
        
          

      

      (ll)         “Performance Goals” means, for a Performance Period, the one or more goals established by the Board for the Performance Period
          based upon the Performance Criteria. Performance Goals may be based on a Company-wide basis, with respect to one or more business units, divisions, Affiliates, or business segments, and in either absolute terms or relative to the performance of
          one or more comparable companies or the performance of one or more relevant indices. The Board is authorized at any time in its sole discretion, to adjust or modify the calculation of a Performance Goal for such Performance Period in order to
          prevent the dilution or enlargement of the rights of Participants, (a) in the event of, or in anticipation of, any unusual or extraordinary corporate item, transaction, event or development; (b) in recognition of, or in anticipation of, any other
          unusual or nonrecurring events affecting the Company, or the financial statements of the Company in response to, or in anticipation of, changes in applicable laws, regulations, accounting principles, or business conditions; or (c) in view of the
          Board’s assessment of the business strategy of the Company, performance of comparable organizations, economic and business conditions, and any other circumstances deemed relevant. Specifically, the Board is authorized to make adjustment in the
          method of calculating attainment of Performance Goals and objectives for a Performance Period as follows: (i) to exclude the dilutive effects of acquisitions or joint ventures; (ii) to assume that any business divested by the Company achieved
          performance objectives at targeted levels during the balance of a Performance Period following such divestiture; and (iii) to exclude the effect of any change in the outstanding shares of common stock of the Company by reason of any stock
          dividend or split, stock repurchase, reorganization, recapitalization, merger, consolidation, spin-off, combination or exchange of shares or other similar corporate change, or any distributions to common stockholders other than regular cash
          dividends. In addition, the Board is authorized to make adjustment in the method of calculating attainment of Performance Goals and objectives for a Performance Period as follows: (i) to exclude restructuring and/or other nonrecurring charges;
          (ii) to exclude exchange rate effects, as applicable, for non-U.S. dollar denominated net sales and operating earnings; (iii) to exclude the effects of changes to generally accepted accounting standards required by the Financial Accounting
          Standards Board; (iv) to exclude the effects of any items that are “unusual” in nature or occur “infrequently” as determined under generally accepted accounting principles; (v) to exclude the effects to any statutory adjustments to corporate tax
          rates; and (vi) to make other appropriate adjustments selected by the Board.

      

      

      (mm)     “Performance Period” means the period of time selected by the Board over which the attainment of one or more Performance Goals
          will be measured for the purpose of determining a Participant’s right to and the payment of a Stock Award or a Performance Cash Award. Performance Periods may be of varying and overlapping duration, at the sole discretion of the Board.

      

      

      (nn)       “Performance Stock Award” means a Stock Award granted under the terms and conditions of Section 6(c)(i).

      

      

      (oo)        “Plan” means this Castle Biosciences, Inc. 2019 Equity Incentive Plan.

      
        
          

      

      (pp)       “Restricted Stock Award” means an award of shares of Common Stock, which is granted pursuant to the terms and conditions of
          Section 6(a).

      

      

      (qq)       “Restricted Stock Award Agreement” means a written agreement between the Company and a holder of a Restricted Stock Award
          evidencing the terms and conditions of a Restricted Stock Award grant. Each Restricted Stock Award Agreement will be subject to the terms and conditions of the Plan.

      

      

      (rr)        “Restricted Stock Unit Award” means a right to receive shares of Common Stock which is granted pursuant to the terms and conditions of Section 6(b).

      

      

      (ss)       “Restricted Stock Unit Award Agreement” means a written agreement between the Company and a holder of a Restricted Stock Unit Award evidencing the terms and conditions of a Restricted Stock Unit Award grant. Each Restricted Stock Unit Award
          Agreement will be subject to the terms and conditions of the Plan.

      

      

      (tt)         “Rule 16b-3” means Rule 16b-3 promulgated under the Exchange Act or any successor to Rule 16b-3, as in effect from time to time.

      

      

      (uu)       “Securities Act” means the Securities Act of 1933, as amended.

      

      

      (vv)        “Stock Appreciation Right” or “SAR” means a right to receive the appreciation on Common Stock that is granted pursuant to
          the terms and conditions of Section 5.

      

      

      (ww)      “Stock Appreciation Right Agreement” means a written agreement between the Company and a holder of a Stock Appreciation Right
          evidencing the terms and conditions of a Stock Appreciation Right grant. Each Stock Appreciation Right Agreement will be subject to the terms and conditions of the Plan.

      

      

      (xx)        “Stock Award” means any right to receive Common Stock granted under the Plan, including an Incentive Stock Option, a
          Nonstatutory Stock Option, a Restricted Stock Award, a Restricted Stock Unit Award, a Stock Appreciation Right, a Performance Stock Award or any Other Stock Award.

      

      

      (yy)       “Stock Award Agreement” means a written agreement between the Company and a Participant evidencing the terms and conditions of a
          Stock Award grant. Each Stock Award Agreement will be subject to the terms and conditions of the Plan.

      

      

      (zz)        “Subsidiary” means, with respect to the Company, (i) any corporation of which more than 50% of the outstanding capital stock
          having ordinary voting power to elect a majority of the board of directors of such corporation (irrespective of whether, at the time, stock of any other class or classes of such corporation will have or might have voting power by reason of the
          happening of any contingency) is at the time, directly or indirectly, Owned by the Company, and (ii) any partnership, limited liability company or other entity in which the Company has a direct or indirect interest (whether in the form of voting
          or participation in profits or capital contribution) of more than 50%.

      

      

      (aaa)     “Ten Percent Stockholder” means a person who Owns (or is deemed to Own pursuant to Section 424(d) of the Code) stock possessing
          more than 10% of the total combined voting power of all classes of stock of the Company or any Affiliate.

      

      

      (bbb)     “Transaction” means a Corporate Transaction or a Change in Control.

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