Document:

Exhibit 4.1

    

     

    

     
      

      

      
        THIS CERTIFIES THAT is the owner of CUSIP DATED COUNTERSIGNED AND REGISTERED: COMPUTERSHARE TRUST COMPANY, N.A. TRANSFER AGENT
          AND REGISTRAR, FULLY-PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK OF Lumos Pharma, Inc. (hereinafter called the “Corporation”), transferable on the books of the Corporation in person or by duly authorized attorney, upon surrender of this
          Certificate properly endorsed. This Certificate and the shares represented hereby, are issued and shall be held subject to all of the provisions of the Articles of Incorporation, as amended, and the By-Laws, as amended, of the Corporation (copies
          of which are on file with the Corporation and with the Transfer Agent), to all of which each holder, by acceptance hereof, assents. This Certificate is not valid unless countersigned and registered by the Transfer Agent and Registrar. Witness the
          facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers. COMMON STOCK PAR VALUE $.01 COMMON STOCK SEE REVERSE FOR CERTAIN DEFINITIONS Certificate Number Shares . LUMOS PHARMA, INC. INCORPORATED UNDER THE
          LAWS OF THE STATE OF DELAWARE Chief Executive Officer Chief Financial Officer and Secretary By AUTHORIZED SIGNATURE March 18, 2020 DEL AWAR E CO R PO RATE LUMOS PHARMA, INC. ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS# 55028X 10 9
          DD-MMM-YYYY * * 000000* * * * * * * * * * * * * * * * * * * * * 000000* * * * * * * * * * * * * * * * * * * * * 000000* * * * * * * * * * * * * * * * * * * * * 000000* * * * * * * * * * * * * * * * * * * * * 000000* * * * * * * * * * * * * * **
          Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David
          Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.
          Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample
          **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander
          David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.
          Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample
          **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Sample **** Mr. Sample
          **000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares***
          *000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****
          000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0
          00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00
          0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000
          000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0000
          00**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00000
          0**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000
          **Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000*
          *Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**
          Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S ***ZERO HUNDRED THOUSAND ZERO HUNDRED AND ZERO*** MR. SAMPLE & MRS. SAMPLE & MR. SAMPLE
          & MRS. SAMPLE ZQ00000000 Certificate Numbers 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 Total Transaction Num/No. 123456 Denom. 123456 Total 1234567 MR A
          SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 PO BOX 505006, Louisville, KY 40233-5006 CUSIP/IDENTIFIER XXXXXX XX X Holder ID XXXXXXXXXX Insurance Value 1,000,000.00 Number of Shares 123456 DTC 12345678 123456789012345 THIS CERTIFICATE IS
          TRANSFERABLE IN CITIES DESIGNATED BY THE TRANSFER AGENT, AVAILABLE ONLINE AT www.computershare.com

         

        

        
          
            

        

         
          

          

          
            

            

            
              The IRS requires that the named transfer agent (“we”) report the cost basis of certain shares or units acquired after
                January 1, 2011. If your shares or units are covered by the legislation, and you requested to sell or transfer the shares or units using a specific cost basis calculation method, then we have processed as you requested. If you did not
                specify a cost basis calculation method, then we have defaulted to the first in, first out (FIFO) method. Please consult your tax advisor if you need additional information about cost basis. If you do not keep in contact with the issuer or
                do not have any activity in your account for the time period specified by state law, your property may become subject to state unclaimed property laws and transferred to the appropriate state. For value received,
                _____________________________hereby sells, assigns and transfers unto ________________________________________________________________________________________________________________________________
                ________________________________________________________________________________________________________________________________
                ________________________________________________________________________________________________________________________________
                _______________________________________________________________________________________________________________________ Shares
                _______________________________________________________________________________________________________________________ Attorney Dated: __________________________________________20__________________ Signature:
                ____________________________________________________________ Signature: ____________________________________________________________ Notice: The signature to this assignment must correspond with the name as written upon the face of the
                certificate, in every particular, without alteration or enlargement, or any change whatever. PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE, OF
                ASSIGNEE) of the common stock represented by the within Certificate, and does hereby irrevocably constitute and appoint to transfer the said stock on the books of the within-named Corporation with full power of substitution in the premises.
                . LUMOS PHARMA, INC. Signature(s) Guaranteed: Medallion Guarantee Stamp THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (Banks, Stockbrokers, Savings and Loan Associations and Credit Unions) WITH MEMBERSHIP IN AN
                APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15. The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according
                to applicable laws or regulations: TEN COM - as tenants in common UNIF GIFT MIN ACT - ............................................Custodian ................................................ (Cust) (Minor) TEN ENT - as tenants by the
                entireties under Uniform Gifts to Minors Act ........................................................ (State) JT TEN - as joint tenants with right of survivorship UNIF TRF MIN ACT - ............................................Custodian
                (until age ................................) and not as tenants in common (Cust) .............................under Uniform Transfers to Minors Act ................... (Minor) (State) Additional abbreviations may also be used though not in
                the above list.Exhibit 10.1

  

  
     

      

    LUMOS PHARMA, INC. 2012 EQUITY INCENTIVE PLAN

     

    
      	
              1.

            	
              Purposes.

            

    

     

    (a)   Eligible Stock Award Recipients. The persons eligible to receive Stock Awards are
        the Employees, Directors and Consultants of the Company and its Affiliates.

     

    (b)   Available Stock Awards. The purpose of the Plan is to provide a means by which
        eligible recipients of Stock Awards may have the opportunity to benefit from increases in value of the Company’s Common Stock through the granting of the following Stock Awards: (i) Incentive Stock Options, (ii) Nonstatutory Stock Options, (iii)
        stock appreciation rights, (iv) stock bonuses and stock units, (v) rights to acquire restricted shares of stock and restricted stock units, and (vi) convertible warrants.

     

    (c)   General Purpose. The Company, by means of the Plan, seeks to attract and retain
        the services of eligible persons, to provide incentives for such persons to exert maximum efforts for the success of the Company and its Affiliates, and to align the interests of such persons and those of the Company’s stockholders.

     

    
      	
              2.

            	
              Definitions.

            

    

     

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

     

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

     

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

     

    (d)  “Committee” means a committee comprised or one or more persons appointed by the
        Board in accordance with subsection 3(c) to whom certain administrative authority with respect to this Plan has been delegated.

     

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

     

    (f)   “Company” means Lumos Pharma, Inc., a Texas corporation, and any successor.

     

    (g)  “Consultant” means any individual consultant or advisor who renders or has rendered
        valuable services to the Company or one of its Affiliates and who is selected to participate in the Plan by the Board; provided, however, that a person who is otherwise a Consultant shall be eligible to participate in the Plan only if such
        participation would not adversely affect the Company’s compliance with applicable laws. Mere service as a Director or receipt of payment for service as a Director shall not confer “Consultant” status.

     

    
      1

      
        

    

    (h)  “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. The Participant’s Continuous Service shall not be deemed to have terminated merely because of 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 Continuous Service. For example, a change in status from an Employee of the Company to a Consultant of an Affiliate or to a Director of the Company will not constitute an interruption of Continuous Service. For purposes of the
        Plan and any award, if an Affiliate ceases to be a parent corporation or subsidiary corporation of the Company, as those terms are defined in Sections 424(e) and (f), respectively, of the Code (a “Change in Status”), a break in Continuous Service
        shall be deemed to have occurred with respect to each Participant providing services to that entity who does not thereafter continue to provide services to the Company or another entity that remains an Affiliate of the Company after the Change in
        Status. The Board or the chief executive officer of the Company, in that party’s sole discretion, may determine whether Continuous Service shall be considered interrupted in the case of any approved leave of absence, including sick leave, military
        leave or any other personal leave.

     

    (i)   “Covered Employee” means the chief executive officer and the four (4) other
        highest compensated officers of the Company for whom total compensation would be required to be reported to stockholders under the Exchange Act, as determined for purposes of Section 162(m) of the Code.

     

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

     

    (k)  “Disability” means, except as more specifically defined in a Stock Award Agreement,
        the inability of a person, in the opinion of a qualified physician acceptable to the Company, or as provided in such person’s service agreement with the Company, to perform the major duties of that person’s position with the Company or an Affiliate
        of the Company because of sickness or injury.

     

    (l)   “Employee” means any person employed by the Company or an Affiliate. Mere service
        as a Director or payment of a director’s fee by the Company or an Affiliate shall not constitute “employment” by the Company or an Affiliate.

     

    (m) “Exchange Act” means the Securities Exchange Act of 1934, as amended.

     

    (n)  “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 the NASDAQ National Market or the NASDAQ SmallCap Market, the Fair Market Value of
      a share of Common Stock shall be the closing sales price for such stock (or the closing bid, if no sales were reported) as quoted on such exchange or market (or the exchange or market with the greatest volume of trading in the Common Stock) on the
      market trading day on the day of determination, as reported in The Wall Street Journal or such other source as the Board deems reliable.

     

    (ii) In the absence of such markets for the Common Stock, the Fair Market Value shall be determined in good faith by the Board.

     

    (o)  “Incentive Stock Option” means an Option intended to qualify as an incentive stock option within the meaning of Section 422 of the Code and the
      regulations promulgated thereunder.

     

    
      2

      
        

    

    (p)  “Non-Employee Director” means a Director of the Company (or an Affiliate) who either

     

    (i) is not a current Employee or Officer of the Company (or an Affiliate), does not receive compensation (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 under the Securities Act (“Regulation S-K”)), does not possess an interest in any other
      transaction as to which disclosure would be required under Item 404(a) of Regulation S-K, and is not engaged in a business relationship as to which disclosure would be required under Item 404(b) of Regulation S-K; or (ii) is otherwise considered a
      “non-employee director” for purposes of Rule 16b-3 (as defined below).

     

    (q)  “Nonstatutory Stock Option” means an Option that is not intended to or does not qualify as an Incentive Stock Option.

     

    (r)   “Officer” means a person who is an officer of the Company within the meaning of Section 16 of the Exchange Act and the rules and regulations promulgated
      thereunder.

     

    (s)   “Option” means an Incentive Stock Option or a Nonstatutory Stock Option granted pursuant to the Plan.

     

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

     

    (u)  “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.

     

    (v)  “Outside Director” means a Director of the Company or an Affiliate who either (i) is not a current Employee of the Company or an “affiliated
      corporation” (within the meaning of Treasury Regulations promulgated under Section 162(m) of the Code), is not a former Employee of the Company or an “affiliated corporation” receiving compensation for prior services (other than benefits under a tax
      qualified pension plan), was not an officer of the Company or an “affiliated corporation” at any time and is not currently receiving direct or indirect remuneration from the Company or an “affiliated corporation” for services in any capacity other
      than as a Director or

     

    (ii) is otherwise considered an “Outside Director” for purposes of Section 162(m) of the Code.

     

    (w) “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.

     

    (x)  “Plan” means this 2012 Equity Incentive Plan.

     

    (y)  “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.

     

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

     

    
      3

      
        

    

    (aa) “Stock Award” means any right granted under the Plan, including an Option, restricted shares, a stock appreciation right, a stock bonus right, a stock
      unit or restricted stock unit, or a convertible warrant.

     

    (bb) “Stock Award Agreement” means a written agreement between the Company and a holder of a Stock Award evidencing the terms and conditions of an individual
      Stock Award. Each Stock Award Agreement shall be subject to the terms and conditions of the Plan.

     

    (cc) “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 of any of its Affiliates.

     

    
      	
              3.

            	
              Administration.

            

    

     

    (a)   Administration by Board. The Board will administer the Plan
        unless and until the Board delegates administration to a Committee, as provided in subsection 3(c).

     

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

     

    (i)  To determine from time to time which of the persons eligible under the Plan shall be granted Stock
        Awards; when and how each Stock Award shall be granted; what type (or combination of types) of Stock Award shall be granted; the provisions of each Stock Award granted (which need not be identical), including the time or times when a person shall
        be permitted to receive stock or units pursuant to a Stock Award; the form(s) of the applicable Stock Award Agreement(s) (which need not be identical either as to type of award or among Participants); and the number of shares or units with respect
        to which a Stock Award shall be granted to each such person.

     

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

     

    (iii)  To amend the Plan as provided in Section 12.

     

    (iv) 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 to the extent not in conflict with the provisions of the Plan.

     

    
      4

      
        

    

    (c)   Delegation to Committee.

     

    (i) General. The Board may delegate administration of the Plan to one or more Committees. Any such Committee shall be
      comprised solely of one or more Directors as may be required under applicable law. The Board or a Committee comprised solely of Directors may also delegate, to the extent permitted by applicable law, to one or more Officers of the Company, its powers
      under this Plan (i) to designate the Officers and Employees of the Company and its Affiliates who will receive Stock Awards under the Plan, and (ii) to determine the number of shares or units subject to, and the other terms and conditions of, such
      awards. The Board may delegate different levels of authority to different Committees with administrative and grant authority under the Plan. Unless otherwise provided in the Bylaws of the Company or the applicable charter of any Committee: (i) a
      majority of the members of the acting Committee shall constitute a quorum, and (b) once the requirement of a quorum is satisfied, the vote of a majority of the members or the unanimous written consent of the members of the Committee shall constitute
      action by the Committee. If administration of the Plan is delegated to a Committee, the Committee shall have, with respect thereto, the powers theretofore possessed by the Board, including the authority to delegate to a subcommittee any of the
      administrative powers the Committee is authorized to exercise (and references in this Plan to the Board shall hereafter include the Committee or subcommittee so authorized), subject, however, to such resolutions, not inconsistent with the provisions
      of the Plan, as may be adopted from time to time by the Board. The Board may suspend or abolish the Committee at any time and re-vest in the Board authority for the administration of the Plan.

     

    (ii) Committee Composition. With respect to awards intended to satisfy the requirements for performance-based compensation under Section
      162(m) of the Code, the Plan shall be administered by a Committee consisting solely of two or more Outside Directors; provided, however, that the failure to satisfy such requirement shall not affect the validity of the action of any Committee
      otherwise duly authorized and acting in the matter. Awards, and transactions in or involving awards, intended to be exempt under Rule 16b-3 must be duly and timely authorized by the Board or a Committee consisting solely of two or more Non-Employee
      Directors. To the extent required by any applicable listing agency, the Plan shall be administered by a Committee composed entirely of independent Directors (within the meaning of the applicable listing agency).

     

    (d)  Effect of Administrator’s Decision. The determinations,
        interpretations and constructions made by the Board or Committee in good faith shall not be subject to review by anyone and shall be final, binding and conclusive on all Participants. Neither the Board nor any Committee, nor any member thereof or
        person acting at the direction thereof, shall be liable for any act, omission, interpretation or determination made in good faith in connection with the Plan (or any Stock Award), and all such persons shall be entitled to indemnification and
        reimbursement by the Company in respect of any claim, loss, damage or expense (including, without limitation, attorneys’ fees) arising or resulting therefrom to the fullest extent permitted by law and/or under any directors and officers liability
        insurance coverage that may be in effect from time to time.

     

    
      	
              4.

            	
              Shares Subject to the Plan.

            

    

     

    (a)  Share Reserve. Subject to the provisions of Section 11
        relating to adjustments upon changes in stock, Stock Awards shall not exceed in the aggregate, rights to more than the number of shares of Common Stock reflected from time to time in the Board’s authorization of this Plan (the “Share Limit”).

     

    
      5

      
        

    

    (b)  Reversion of Shares to the Share Reserve. If any Stock
        Award lapses for any reason, in whole or in part, without having been exercised in full (or without vesting in the case of restricted shares of stock and stock units), the stock not acquired under such Stock Award shall revert to and again become
        available for issuance under the Plan. To the extent that a Stock Award is ultimately satisfied in cash or a form other than shares of Common Stock, the shares that would have been delivered had there been no such cash or other settlement shall not
        reduce the number of shares thereafter available for issuance under this Plan. In the event that shares are delivered in respect of a stock appreciation right award, only the actual number of shares delivered to satisfy the award shall be counted
        against the share limit of this Plan. Shares that are exchanged by a Participant or withheld by the Company as full or partial payment in connection with any award, as well as any shares exchanged by a Participant or withheld by the Company to
        satisfy the tax withholding obligations related to any Stock Award, shall be available for subsequent Awards under the Plan. The foregoing adjustments to the share limits of the Plan are subject to any applicable limitations under Section 162(m) of
        the Code with respect to awards intended as performance-based compensation thereunder.

     

    (c)   Source of Shares. The stock subject to the Plan may
        be unissued shares, treasury shares, or other reacquired shares, bought on the market or otherwise.

     

    
      	
              5.

            	
              Eligibility.

            

    

     

    (a)   Eligibility for Specific Stock Awards. Incentive
        Stock Options may be granted only to Employees. Stock Awards other than Incentive Stock Options may be granted to Employees, Directors and Consultants.

     

    (b)  Ten Percent Stockholders. No Ten Percent Stockholder
        shall be eligible for the grant of an Incentive Stock Option unless the exercise price of such Option is at least one hundred ten percent (110%) of the Fair Market Value of the Common Stock at the date of grant and the Option is not exercisable
        after the expiration of five (5) years from the date of grant.

     

    (c)  Section 162(m) Limitation. During any period when the
        Company is required to file public reports under the Exchange Act and subject to the provisions of Section 11 relating to adjustments upon changes in stock, no Employee shall be eligible to receive Options and/or stock appreciation rights under the
        Plan covering more than the following applicable limit: (i) two million (2,000,000) shares in the aggregate as to awards granted to the Employee during the fiscal year of the Company in which the Employee is initially employed by the Company or an
        Affiliate, or (ii) one million (1,000,000) shares in the aggregate as to awards granted to the Employee during any subsequent fiscal year of the Company.

     

    
      	
              6.

            	
              Option Provisions.

            

    

     

    Each Option shall be in such form and shall contain such terms and conditions as the Board shall deem appropriate. All Options shall be separately designated Incentive Stock
      Options or Nonstatutory Stock Options at the time of grant, and a separate certificate or certificates will be issued for shares purchased on exercise of each type of Option, unless the shares are to be issued pursuant to a vesting plan under a Stock
      Award Agreement, in which case such certificates shall be issued in accordance with such agreement. Any Option not so designated shall be deemed to be a Nonstatutory Stock Option. The provisions of separate Options need not be identical, but each
      Option shall be deemed to include (through incorporation by reference or otherwise) the substance of each of the following provisions:

     

    
      6

      
        

    

    (a)  Term. Subject to the limitations of subsection 5(b)
        regarding Ten Percent Stockholders, no Option shall be exercisable after the expiration of ten (10) years from the date it was granted.

     

    (b)  Exercise Price of an Incentive Stock Option. Subject
        to the limitations of subsection 5(b) regarding Ten Percent Stockholders, the exercise price of each Incentive Stock Option shall be not less than one hundred percent (100%) of the Fair Market Value of the stock subject to the Option on the date
        the Option is granted. Notwithstanding the foregoing, an Incentive Stock Option may be granted with an exercise price lower than that set forth in the preceding sentence if such Option is granted pursuant to an assumption of or substitution for
        another option in a manner satisfying the provisions of Section 424(a) of the Code.

     

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

     

    (d)  Consideration. The purchase price of stock acquired
        pursuant to an Option shall be paid, to the extent permitted by applicable statutes and regulations, either (i) in cash at the time the Option is exercised or (ii) at the discretion of the Board at the time of the grant of the Option (or
        subsequently, in the case of a Nonstatutory Stock Option), and subject to compliance with all applicable laws, by delivery to the Company of other Common Stock, according to a deferred payment or other arrangement (which may include, without
        limiting the generality of the foregoing, the use of other Common Stock) with the Participant or in any other form of legal consideration that may be acceptable to the Board; provided, however, that payment of the Common Stock’s “par value,” as
        defined in the Texas Business Corporation Act, shall not be made by deferred payment. In the case of any deferred payment arrangement, interest shall be compounded at least annually and shall be charged at the minimum rate of interest (i.e., the
        current applicable federal rate) necessary to avoid imputed interest under the Code resulting from the deferred payment arrangement.

     

    (e)  Transferability of an Incentive Stock Option. An
        Incentive Stock Option shall not be transferable except by will or by the laws of descent and distribution and shall be exercisable during the lifetime of the Optionholder only by the Optionholder. Notwithstanding the foregoing provisions of this
        subsection 6(e), the Optionholder may, by delivering written notice to the Company, in a form satisfactory to the Company, designate a third party who, in the event of the death of the Optionholder, shall thereafter be entitled to exercise the
        Option. Absent such designation, the duly appointed legal representative of the Optionholder’s estate may exercise the Option.

     

    (f)   Transferability of a Nonstatutory Stock Option. A
        Nonstatutory Stock Option shall be transferable to the extent provided in the Option Agreement. If the Nonstatutory Stock Option does not provide for transferability, then the Nonstatutory Stock Option shall not be transferable except by will or by
        the laws of descent and distribution and shall be exercisable during the lifetime of the Optionholder only by the Optionholder. Notwithstanding the foregoing provisions of this subsection 6(f), the Optionholder may, by delivering written notice to
        the Company, in a form satisfactory to the Company, designate a third party who, in the event of the death of the Optionholder, shall thereafter be entitled to exercise the Option. Absent such designation, the duly appointed legal representative of
        the Optionholder’s estate may exercise the Option.

     

    
      7

      
        

    

    (g)  Vesting Generally. The total number of shares of
        Common Stock subject to an Option may be fully vested or may vest and become exercisable in periodic installments which may, but need not, be equal. The Option may be subject to such other terms and conditions as to the time(s) when it may be
        exercised (which may be based on performance or other criteria) as the Board deems appropriate. The vesting provisions of individual Options may vary. The provisions of this subsection 6(g) are subject to any Option provisions governing the minimum
        number of shares as to which an Option may be exercised at any given time.

     

    (h)  Termination of Continuous Service. In the event an
        Optionholder’s Continuous Service terminates (other than upon the Optionholder’s death or Disability), the Optionholder may exercise his or her Option (to the extent that the Optionholder was entitled to exercise it as of the date of termination)
        but only within such period of time ending on the earlier of (i) the date three (3) months following the termination of the Optionholder’s Continuous Service (or such longer or shorter period as may be specified in the Option Agreement), or (ii)
        the expiration of the term of the Option as set forth in the Option Agreement. If the Optionholder does not exercise his or her Option within the time specified in the Option Agreement (or herein), the Option shall terminate.

     

    (i)   Extension of Termination Date. An Option Agreement
        may also provide that if the exercise of the Option following the termination of the Optionholder’s Continuous Service (other than upon the Optionholder’s death or Disability) would be prohibited at any time solely because the issuance of shares
        would violate the registration requirements under the Securities Act, then the Option shall terminate on the earlier of (i) expiration of the term of the Option set forth in the Option Agreement or (ii) the expiration of a period of three (3)
        months next following the termination of the Optionholder’s Continuous Service during which the exercise of the Option would not violate such registration requirements.

     

    (j)   Disability of Optionholder. In the event an
        Optionholder’s Continuous Service terminates as a result of the Optionholder’s Disability, the Optionholder may exercise his or her Option (to the extent that the Optionholder was entitled to exercise it as of the date of termination), but only
        within such period of time ending on the earlier of (i) the date twelve (12) months following such termination of Continuous Service (or such longer or shorter period specified in the Option Agreement) or (ii) the expiration of the term of the
        Option as set forth in the Option Agreement. If, after termination, the Optionholder does not exercise his or her Option within the time specified herein, the Option shall terminate.

     

    (k)   Death of Optionholder. In the event (i) an
        Optionholder’s Continuous Service terminates as a result of his death or (ii) the Optionholder dies after the termination of his Continuous Service but during a permitted exercise period, then the Option may be exercised (to the extent the
        Optionholder was entitled to exercise the Option as of the date of death) by a person designated to exercise the option upon the Optionholder’s death pursuant to subsection 6(e) or 6(f), but only within the period ending on the earlier of (1) the
        date eighteen (18) months following the date of death (or such longer or shorter period specified in the Option Agreement) or (2) expiration of the term of such Option as set forth in the Option Agreement. If, after death, the Option is not
        exercised within the time specified herein, the Option shall terminate.

     

    
      8

      
        

    

    (l)   Re-Load Options. Without limiting the Board’s
        authority to make or not to make grants of Options hereunder, the Board shall have the authority (but not an obligation) to include as part of any Option Agreement a provision entitling the Optionholder to a further Option (a “Re-Load Option”) in
        the event the Optionholder exercises the Option evidenced by the Option Agreement, in whole or in part, by surrendering other shares of Common Stock in accordance with this Plan and the terms and conditions of the Option Agreement. Any such Re-Load
        Option shall (i) cover a number of shares equal to the number of shares surrendered as part or all of the exercise price of the original Option; (ii) have an expiration date which is the same as the expiration date of the Option the exercise of
        which gave rise to such Re-Load Option; and (iii) have an exercise price which is equal to one hundred percent (100%) of the Fair Market Value of the Common Stock subject to the Re-Load Option determined as of the date of exercise of the original
        Option. Notwithstanding the foregoing, a Re-Load Option shall otherwise be subject to the same exercise price and term restrictions described above for Options under the Plan. Any such Re-Load Option may be an Incentive Stock Option or a
        Nonstatutory Stock Option, as the Board may designate in the Option Agreement; provided, however, that the designation of any Re-Load Option as an Incentive Stock Option shall be subject to the one hundred thousand dollars ($100,000) annual
        limitation on exercisability of Incentive Stock Options described in subsection 10(d) below and in Section 422(d) of the Code. There shall be no further Re-Load Options on a Re-Load Option. Any Re-Load Option shall be subject to the availability of
        sufficient shares under subsection 4(a) and the “Section 162(m) Limitation” on the grants of Options under subsection 5(c), and shall be subject to such other terms and conditions as the Board may determine to the extent consistent with the express
        provisions of the Plan regarding the terms of Options.

     

    
      
        	7.	
                Provisions of Stock Awards Other than Options.

              

      

    

     

    (a)  Stock Bonus and Stock Unit Awards. The Company may implement a cash bonus program pursuant to which cash bonuses under the program
      for a specified period of time are determined based on the achievement of performance targets established by the Board with respect to the relevant period. To the extent that a cash bonus is otherwise payable to an Employee, Director or Consultant
      pursuant to such a program, the Board may (subject to any contrary commitment in the Service Agreement) grant a stock bonus or stock unit award under the Plan to one or more of such persons in lieu of all or a portion of any cash bonus that such
      Participant would have otherwise received for the related performance period. Each stock bonus agreement and stock unit award agreement shall be in such form and shall contain such terms and conditions as the Board shall deem appropriate. The terms
      and conditions of stock bonus agreements and stock unit award agreements may change from time to time, and the terms and conditions of separate stock bonus agreements and stock unit award agreements need not be identical, but each such agreement
      shall include (through incorporation of provisions hereof by reference in the agreement or otherwise) the substance of each of the following provisions:

     

    (i)   Consideration. A stock bonus shall be awarded in
        consideration for past services actually rendered to the Company for its benefit.

     

    (ii)  Vesting. Shares of Common Stock awarded under the
        stock bonus agreement may, but need not, be subject to a share reacquisition option in favor of the Company in accordance with a vesting schedule to be determined by the Board. Stock units awarded under the stock unit award agreement may, but need
        not, be subject to forfeiture to the Company in accordance with a vesting schedule to be determined by the Board.

     

    
      9

      
        

    

    (iii) Termination of Participant’s Continuous Service. In
        the event a Participant’s Continuous Service terminates, (a) the Company may reacquire any or all of the shares of Common Stock held by the Participant that have not vested as of the date of termination under the terms of the stock bonus agreement,
        and (b) stock units that have not vested as of the date of termination under the stock unit award agreement may be forfeited to the Company without consideration.

     

    (iv) Transferability. Rights to acquire shares under the
        stock bonus agreement, as well as stock units, shall be transferable by the Participant only upon such terms and conditions as are set forth in the applicable Stock Award Agreement, as the Board shall determine in its discretion, so long as stock
        or units awarded remain subject to the terms of the applicable Stock Award Agreement.

     

    (v)  Payout of Stock Units. Each stock unit award shall be
        payable in an equivalent number of shares of Common Stock at the time specified by the Board in the applicable Stock Award Agreement and subject to such other conditions or procedures as the Board may impose in the Stock Award Agreement.

     

    (vi) Dividend and Voting Rights. Unless otherwise provided
        in the applicable Stock Award Agreement, a Participant receiving a stock bonus award shall be entitled to cash dividend and voting rights for all shares issued even though they are not vested, provided that such rights shall terminate immediately as to any shares subject to the stock bonus that are forfeited, reacquired by the Company or otherwise cease to be eligible for vesting (if applicable). Stock bonuses (to the extent not also entitled to
        receive cash dividends) and stock unit awards may include rights to receive dividend equivalents to the extent authorized, and on the terms and conditions established, by the Board. If the Participant shall have paid or received cash (including any
        cash payments in respect of dividends) in connection with the stock bonus or stock unit award, the Stock Award Agreement shall specify the extent (if any) to which such amounts shall be returned (with or without an earnings factor) as to any stock
        bonus or stock unit awards that cease to be eligible for vesting.

     

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

     

    
      10

      
        

    

    (i)   Restricted Stock Awards.

     

    (1)  Grants. Stock acquired pursuant to each restricted stock purchase award shall be issued and registered in the name of the
      Participant to whom such restricted stock award was granted; provided, however, that such unvested stock shall be held by the Company or its agent for the account of such Participant during the applicable
      vesting period, and the Company may make stock ledger entries in the Participant’s name rather than issuing a certificate evidencing unvested shares. If certificates are issued representing unvested shares of stock, as a condition to the receipt of
      such certificates, each Participant shall deliver to the Company stock powers duly endorsed in blank by the Participant. None of the restricted stock may be sold, exchanged, transferred, assigned, pledged or otherwise encumbered or disposed of by the
      Participant before such restricted stock is vested. The vesting period for restricted stock must be at least (a) one (1) year in the case of a restricted stock award subject to a vesting schedule based upon the achievement of specified performance
      goals by the Participant or (b) three (3) years in the case of a restricted stock award absent such performance-based vesting; provided that the Board may provide (in the applicable Stock Award Agreement or by an amendment thereto) that the award
      shall vest in full upon the occurrence of a Change in Control of the Company (as defined in Section 11(c) of this Plan) and the Board may provide for pro-rata vesting over the applicable period; further provided that restricted stock awards may be
      granted under this Plan that do not comply with the preceding minimum vesting requirement as long as the aggregate number of shares of Common Stock issued with respect to such non-conforming awards granted under this Plan does not exceed 10% of the
      Share Limit. Except with respect to any share repurchase option in favor of the Company in accordance with an effective agreement or any restricted stock serving as security for indebtedness of the Participant to the Company under the terms of a
      pledge agreement (as may be applicable), at the end of the applicable vesting period with respect to any shares of restricted stock, or at such earlier time as otherwise provided for herein, all restrictions under the Stock Award Agreement with
      respect to such restricted stock shall terminate, and the appropriate number of shares of Common Stock shall be transferred as soon as practicable to the Participant or the Participant’s beneficiary or estate, as the case may be. However, nothing
      herein shall preclude the continued application of further restrictions to such vested shares of Common Stock under other agreements with the Company, or by reason of restrictive legends applicable to such stock.

     

    (2)  Purchase Price. The purchase price under each
        restricted stock award agreement shall be such amount as the Board shall determine and designate in such restricted stock award agreement, but not less than the par value of each share subject to the award.

     

    (3)  Consideration. The purchase price of stock acquired
        pursuant to the restricted stock award agreement shall be paid either: (i) in cash at the time of purchase; (ii) at the discretion of the Board and subject to compliance with all applicable laws, according to a deferred payment or other arrangement
        with the Participant; or (iii) in any other form of legal consideration that may be acceptable to the Board in its discretion; provided, however, that while the Company is incorporated in Texas payment of the Common Stock’s “par value,” as defined
        in the Texas Business Organizations Code shall not be made by deferred payment.

     

    (4)  Vesting. Shares of Common Stock acquired under the
        restricted stock award agreement may, but need not, be subject to a share repurchase option in favor of the Company in accordance with a vesting schedule to be determined by the Board.

     

    
      11

      
        

    

    (ii)  Restricted Stock Unit Awards

     

    (1)  Grants. A restricted stock unit shall represent a non-voting unit of measurement which is deemed for bookkeeping and payment
      purposes to represent one outstanding share of Stock upon the terms and conditions set forth by the Board. None of the rights with respect to restricted stock units may be sold, exchanged, transferred, assigned, pledged or otherwise encumbered or
      disposed of by the Participant before such restricted stock units have vested and, unless otherwise expressly provided in the applicable Stock Award Agreement, the Stock subject to such restricted stock units has been issued. The vesting period for
      restricted stock units must be at least (a) one (1) year in the case of a restricted stock unit award subject to a vesting schedule based upon the achievement of specified performance goals by the Participant or (b) three (3) years in the case of a
      restricted stock unit award absent such performance-based vesting; provided that the Board may provide (in the applicable restricted stock unit award agreement or by an amendment thereto) that the award shall vest in full upon the occurrence of a
      change in control of the Company and the Board may provide for pro-rata vesting over the applicable period; further provided that restricted stock unit awards may be granted under this Plan that do not comply with the preceding minimum vesting
      requirement as long as the aggregate number of shares of Common Stock issued with respect to such non-conforming awards granted under this Plan does not exceed 10% of the Share Limit. At the end of the applicable vesting period with respect to any
      restricted stock unit, or at such earlier time as otherwise provided for herein, all restrictions with respect to such restricted stock unit shall terminate, and the appropriate number of shares of Stock shall be delivered as soon as practicable to
      the Participant or the Participant’s beneficiary or estate, as the case may be. However, nothing herein shall preclude the application of restrictions to shares of stock issued in satisfaction of vested restricted stock units under other agreements
      with the Company, or by reason of restrictive legends applicable to such stock. The Participant’s restricted stock unit award agreement may permit the Participant to elect the time of payout of vested restricted stock units on such conditions or
      subject to such procedures as the Board may impose.

     

    (iii) Termination of Participant’s Continuous Service. In
        the event a Participant’s Continuous Service terminates, (A) the Company may forfeit, repurchase or otherwise reacquire any or all of the shares of Common Stock held by the Participant that have not vested as of the date of termination under the
        terms of the restricted stock award agreement and (B) restricted stock units that have not vested as of the date of termination under the restricted stock unit award agreement shall terminate.

     

    (iv) Dividend and Voting Rights. Unless otherwise provided
        in the applicable restricted stock award agreement, a Participant receiving a restricted stock award shall be entitled to cash dividend and voting rights for all shares issued even though they are not vested, provided that such rights shall
        terminate immediately as to any restricted shares that cease to be eligible for vesting. Restricted stock awards (to the extent not also entitled to receive cash dividends) may include rights to receive dividend equivalents to the extent
        authorized, and on the terms and conditions established, by the Board. If the Participant shall have paid or received cash (including any payments in respect of dividends) in connection with the Stock Award Agreement, the Agreement shall specify
        the extent (if any) to which such amounts shall be returned (with or without an earnings factor) as to any shares of restricted stock that cease to be eligible for vesting.

     

    (c) Stock Appreciation Rights.

     

    (i)   Authorized Rights. The following three types of stock appreciation rights shall be authorized for issuance under the Plan:

     

    
      12

      
        

    

    (1)  Tandem Rights. A “Tandem Right” means a stock
        appreciation right granted appurtenant to, and subject to the same terms and conditions applicable to, an Option, with the following exceptions: The Tandem Right shall require the holder to elect between the exercise of the underlying Option for
        shares of Common Stock and the surrender, in whole or in part, of such Option in exchange for an appreciation distribution. The appreciation distribution payable on the exercised Tandem Right shall be in cash (or, if so provided, in an equivalent
        number of shares of Common Stock based on their Fair Market Value on the date of the Option surrender) in an amount up to the excess of (A) the aggregate Fair Market Value (on the date of the Option surrender) of the number of shares of Common
        Stock covered by that portion of the surrendered Option in which the Optionholder is vested over (B) the aggregate exercise price payable for such vested shares.

     

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

     

    (3)  Independent Rights. An “Independent Right” means a stock appreciation right granted independently of any Option but which is
      subject to the same terms and conditions applicable to a Nonstatutory Stock Option with the following exceptions: An Independent Right shall be denominated in share equivalents. The appreciation distribution payable on the exercised Independent Right
      shall be not greater than an amount equal to the excess of (a) the aggregate Fair Market Value (on the date of the exercise of the Independent Right) of a number of shares of Company stock equal to the number of share equivalents in which the holder
      is vested under such Independent Right, and as to which the holder is exercising the Independent Right on such date, over (b) the aggregate Fair Market Value (on the date of the grant of the Independent Right) of such number of shares of Company
      stock. The appreciation distribution payable on the exercised Independent Right shall be in cash or, if so provided, in an equivalent number of shares of Common Stock based on Fair Market Value on the date of the exercise of the Independent Right.

     

    (ii)   Relationship to Options. Stock appreciation rights appurtenant to Incentive Stock
        Options may be granted only to Employees. The “Section 162(m) Limitation” provided in subsection 5(c) shall apply as well to the grant of stock appreciation rights.

     

    (iii) Exercise. To exercise any outstanding stock appreciation right, the holder shall
        provide written notice of exercise to the Company in compliance with the provisions of the Stock Award Agreement evidencing such right. Except as provided in subsection 5(c) regarding the “Section 162(m) Limitation,” no limitation shall exist on
        the aggregate amount of cash payments that the Company may make under the Plan in connection with the exercise of a stock appreciation right.

     

    
      13

      
        

    

    (d)  Convertible Warrants. The Company may issue Stock Awards consisting of warrants convertible into shares of the Company’s Common Stock to Consultants,
      advisors and other third-party providers who have performed or agreed to perform actual services for the benefit of the Company. The conditions and terms of exercise shall be set forth in the warrant agreement. The term of exercise shall not exceed
      five (5) years, and the exercise price shall not be less than the Fair Market Value of the underlying Common Stock on the date of the Stock Award.

     

    
      
        	8.	
                Covenants of the Company.

              

      

    

     

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

     

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

     

    
      
        	9.	
                Use of Proceeds from Stock.

              

      

    

     

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

     

    
      
        	10.	
                Miscellaneous.

              

      

    

     

    (a)   Acceleration of Exercisability and Vesting. In its
        sole discretion, the Board shall have the power to accelerate the time at which a Stock Award may first be exercised or the time during which a Stock Award or any part thereof will vest or be delivered in accordance with the Plan, notwithstanding
        the provisions in the Stock Award Agreement stating the time at which it may first be exercised or the time during which it will vest.

     

    (b)  Stockholder Rights. Except as otherwise expressly
        authorized by the Committee or this Plan, no Participant shall be deemed to be the holder of, or to have any of the rights of a holder with respect to, any shares subject to such Stock Award unless and until such shares of stock have been delivered
        to and are held of record by the Participant, or such shares have been duly registered in the name of the Participant by the Company. No adjustments shall be made for dividends or other rights accruing in favor of a stockholder for whom the record
        date is prior to the date of delivery or constructive delivery by registration of the shares of Stock.

     

    
      14

      
        

    

    (c)  No Employment or other Service Rights. Subject only to
        the provision of any applicable Service Agreement, nothing in the Plan or any instrument executed or Stock Award granted pursuant thereto shall confer upon any Participant or other holder of Stock Awards 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 in any other capacity, or shall 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.

     

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

     

    (e)  Investment Assurances. The Company may require a
        Participant, as a condition of exercising or acquiring stock under any Stock Award, (i) to give written assurances satisfactory to the Company (A) 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 (B) 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 the stock subject to the Stock Award for the Participant’s own account and not with any present
        intention of selling or otherwise distributing the stock. The foregoing assurances may not be required if the issuance of the shares upon the exercise or acquisition of stock under the Stock Award has been registered under a then currently
        effective registration statement filed under the Securities Act or, as to any particular requirement, a determination is made by counsel for the Company that such requirement is not necessary under 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
        further transfer of the stock.

     

    (f)  Withholding Obligations. Without limiting any other
        withholding obligation incumbent upon the Company, upon any exercise, vesting, or payment of any Stock Award or upon the disposition of shares of Common Stock acquired pursuant to the exercise of an Incentive Stock Option prior to satisfaction of
        the holding period requirements of Section 422 of the Code, the Company or one of its Affiliates shall have the right at its option to:

     

    (i)   require the Participant (or the Participant’s personal representative or beneficiary, as the case may be) to pay or
        provide for payment of any taxes that the Company or one of its Affiliates may be required to withhold with respect to such award event or payment; or

     

    
      15

      
        

    

    (ii)  deduct from any amount otherwise payable in cash to the Participant (or the Participant’s personal representative
        or beneficiary, as the case may be) any taxes that the Company or one of its Affiliates may be required to withhold with respect to such cash payment.

     

    In any case where a tax or other governmental assessment is required to be withheld in connection with the delivery of shares of Common Stock under the Plan, the Board or
      applicable Committee may in its sole discretion (subject to compliance with applicable law) grant (either at the time of the award or thereafter) to the Participant the right to elect, pursuant to such rules and subject to such conditions as the
      Board or applicable Committee may establish, to have the Company reduce the number of shares to be delivered by (or otherwise reacquire) the appropriate number of shares, valued in a consistent manner at their Fair Market Value or at the sales price
      in accordance with authorized procedures for cashless exercises, necessary to satisfy withholding tax obligations on exercise, vesting or payment. In no event shall the shares withheld exceed the number of shares required for tax withholding under
      applicable law.

     

    
      
        	11.	
                Adjustments upon Changes in Stock.

              

      

    

     

    (a)  Capitalization Adjustments. If any material change is made in the stock subject to the Plan, or subject to any Stock Award (a “Material
      Change”), without the receipt of consideration by the Company (whether through merger, consolidation, reorganization, other change in corporate structure, recapitalization, reincorporation, stock dividend, dividend in property other than cash, stock
      split, liquidating dividend, combination of shares, exchange of shares, or other transaction not involving the receipt of consideration by the Company), the Plan may be appropriately adjusted as to the class(es) and maximum number of securities
      subject to the Plan pursuant to subsection 4(a) and as to the maximum number of securities subject to award to any person pursuant to subsection 5(c), and the outstanding Stock Awards may be appropriately adjusted as to the class(es) and number of
      securities and price per share of stock subject to such outstanding Stock Awards, and (ii) in the event such Material Change involves any distribution or alienation of the Company’s assets, the Stock Awards then outstanding shall be equitably
      adjusted as to pricing and/or number of shares/units subject to such Awards in order to fairly take into consideration the nature of the Material Change and its effect on the value of such Stock Awards. Such adjustments shall be final, binding and
      conclusive unless shown to be grossly unreasonable. (The conversion of any convertible securities of the Company shall not be treated as a transaction “without receipt of consideration” by the Company, however.)

     

    (b)   Liquidation or Termination. In the event of a liquidation or
        termination of the Company, all Stock Awards shall be terminated if not exercised (if applicable) prior to such event.

     

    (c)  Change in Control. The term “Change of Control” shall mean a
        merger or consolidation in which (1) the Company is not the surviving corporation or (2) the shareholders of the Company immediately prior to such transaction will not own, in the aggregate, a majority of the voting equity of the surviving entity
        immediately after consummation of the transaction. If, in the context of a Change of Control, the surviving or acquiring corporation does not agree in writing to assume or continue any Stock Awards outstanding under the Plan (or to substitute
        similar stock awards) of substantially equivalent value for those outstanding under the Plan (which may require the issuance of securities or consideration substantially identical to that issued to holders of the Company’s Common Stock in
        connection with the Change of Control), then with respect to Stock Awards held by Participants whose Continuous Service has not terminated prior to the Change of Control, the vesting of such Stock Awards (and, if applicable, the time during which
        such Stock Awards may be exercised) shall be fully accelerated effective as of the date on which the Change of Control occurred, and any such Stock Awards as to which exercise is still required and permitted shall terminate if not exercised by a
        time reasonably established by the Board on written notice to the holders of such Stock Awards given in connection with such Change of Control. With respect to any other Stock Awards outstanding under the Plan, such Stock Awards shall terminate if
        not exercised (if applicable) at or prior to such event. This provision shall not be deemed to limit, however, any provision contained in a Stock Award Agreement that affords more favorable acceleration treatment to a Participant.  In the event of
        a Change of Control, the surviving, continuing, successor, or purchasing corporation or other business entity or parent thereof, as the case may be (the “Acquiror”), may, without the consent of any Participant, assume or continue the Company’s rights and obligations under each or any Stock Award or portion thereof outstanding immediately prior to the Change of Control or
        substitute for each or any such outstanding Stock Award or portion thereof a substantially equivalent award with respect to the Acquiror’s stock. For purposes of this Section 11, any Stock Award or portion thereof which is neither assumed or
        continued in connection with the Change of Control nor exercised as of the time of consummation of the Change of Control shall terminate and cease to be outstanding effective as of the time of consummation of the Change of Control.

     

    
      16

      
        

    

    
      
        	12.	
                Amendment of the Plan and Stock Awards.

              

      

    

     

    (a)  Amendment of Plan. The Board at any time, and from time to time, may amend the Plan. However, except as provided in Section 11
      relating to adjustments upon changes in stock, no amendment shall be effective unless approved by the stockholders of the Company to the extent stockholder approval is necessary to satisfy the requirements of (i) Section 422 of the Code, and (ii) if
      the Company has then registered an initial public offering of securities, Rule 16b-3 and any NASDAQ or securities exchange listing requirements. In addition, if the Board determines that any amendment to the Plan would materially increase the
      benefits accruing to Participants under the Plan, materially increase the number of securities that may be issued under the Plan, and/or materially modify the requirements for participation in the Plan, then the Board shall submit such those proposed
      features of the proposed amendment for approval by the stockholders of the Company.

     

    (b)  Stockholder Approval. The Board may, in its sole
        discretion, submit any other amendment to the Plan for stockholder approval, including, but not limited to, amendments to the Plan intended to satisfy the requirements of Sections 162(m) and 409A of the Code and the regulations thereunder
        (including those regarding deferred compensation, and the exclusion of performance-based compensation from the limit on corporate deductibility of compensation paid to certain executive officers).

     

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

     

    (d)  No Impairment of Rights. Rights under any Stock Award
        granted before amendment of the Plan shall not be materially impaired by any amendment of the Plan unless (a) the Participant consents in writing or (b) such amendment is required in order to assure this Plan’s compliance with applicable law and
        regulations.

     

    
      17

      
        

    

    (e)  No Re-pricings Without Stockholder Approval. Notwithstanding
        anything else in this Plan to the contrary, and except for an adjustment contemplated by Section 11(a) or any re-pricing that may be approved by the Company’s stockholders, the exercise price or base price, as applicable, of an Option or stock
        appreciation right granted under the Plan shall not be re-priced (by amendment, cancellation and re-grant, exchange or other means) after the date the award is granted.

     

    
      
        	13.	
                Termination or Suspension of the Plan.

              

      

    

     

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

     

    (b)   No Impairment of Rights. Rights and obligations under any Stock Award granted while the Plan is in effect shall not be impaired
      by suspension or termination of the Plan, except with the written consent of the Participant.

     

    
      
        	14.	
                Effective Date of Plan.

              

      

    

     

    The Plan shall become effective as determined by the Board, but no Stock Award shall be exercised or shares thereunder shall be delivered (or, in the case of a stock bonus or
      restricted stock award, shall be granted) unless and until the Plan has been approved by the stockholders of the Company, which approval shall occur within twelve (12) months before or after the date the Plan is adopted by the Board.

     

    
      
        	15.	
                Governing Law, Severability.

              

      

    

     

    (a)  Choice of Law. The Plan, the awards, all documents
        evidencing awards and all other related documents shall be governed by and construed in accordance with the laws of the State of Texas.

     

    (b)  Severability. If a court of competent jurisdiction
        holds any provision invalid and unenforceable, the remaining provisions of the Plan shall continue in effect, and the Plan shall be reformed to the minimal extent necessary to render the otherwise invalid provision enforceable.

     

    (c)   Captions. Captions are used solely as a convenience
        to facilitate reference and shall not be deemed to affect the construction of the Plan or any provision thereof.

     

    (d)   Non-Exclusivity of Plan. Nothing in this Plan shall be deemed to limit the authority of the Board or any Committee to grant awards
      or authorize any other compensation, with or without reference to the Common Stock, under any other plan or authority.

     

     

    

  

  18

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