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      FOURTH
        AMENDMENT TO

      CREDIT
        AGREEMENT

       

      THIS
        FOURTH AMENDMENT TO CREDIT AGREEMENT, dated effective as of January 25, 2007
        (the "Fourth Amendment"), is made and entered into between and among UNIT
        CORPORATION, SUPERIOR PIPELINE COMPANY, L.L.C., UNIT DRILLING COMPANY, UNIT
        PETROLEUM COMPANY, PETROLEUM SUPPLY COMPANY, UNIT ENERGY CANADA, INC. and
        UNIT
        TEXAS DRILLING, L.L.C. (collectively, the "Borrowers"), BANK OF OKLAHOMA,
        NATIONAL ASSOCIATION ("BOk"), BANK OF AMERICA ("B of A"), BMO CAPITAL MARKETS
        FINANCING, INC., formerly Harris Nesbitt Financing, Inc. ("BMO"), and COMPASS
        BANK ("Compass") (individually a "Lender" and collectively, the "Lenders")
        and
        BANK OF OKLAHOMA, NATIONAL ASSOCIATION, as agent for the Lenders now or
        hereafter signatory parties thereto (the "Agent").

       

      RECITALS:

       

      A. The
        Borrowers (other than Unit Texas Drilling, L.L.C. ("Unit Texas")), the Lenders
        and the Agent entered into that certain Credit Agreement dated as of January
        30,
        2004, as amended by the First Amendment thereto dated effective as of June
        1,
        2005, as further amended by the Second Amendment thereto dated as of November
        4,
        2005, between and among the Borrowers (other than Unit Texas), and as further
        amended by the Third Amendment thereto dated as of October 10, 2006, between
        and
        among the Borrowers, the Lenders and the Agent (collectively, the "Existing
        Credit Agreement"), pursuant to which the Lenders severally established certain
        Commitments set forth on the Lenders Schedule annexed thereto as Schedule
        2
        until the Facility Termination Date, subject to the Maximum Credit Amount
        and
        the Borrowing Base.

       

      B. The
        Borrowers have requested the Lenders' to extend the Facility Termination
        Date
        from January 31, 2008, to May 31, 2008.

       

      C. The
        Lenders are willing to so extend the existing Facility Termination Date (January
        31, 2008) for the Existing Credit Agreement until an extended Facility
        Termination Date of May 31, 2008, subject to the terms, provisions, conditions
        and limitations set forth in the Existing Credit Agreement and as hereinafter
        set forth.

       

      THEREFORE,
        subject to the terms, provisions, conditions and limitations hereinafter
        set
        forth, the Lenders are willing to extend the Facility Termination Date from
        January 31, 2008, to May 31, 2008, all subject to the terms, provisions,
        conditions and limitations hereof and of the Existing Credit
        Agreement;

       

      NOW,
        THEREFORE, in consideration of the mutual covenants and agreements contained
        herein, and other good and valuable consideration, receipt of which is
        acknowledged by the parties hereto, the parties agree as follows:

       

      1. The
        definition of "Facility Termination Date" in the Existing Credit Agreement
        is
        amended by deleting the reference therein to "the date which is four (4)
        years
        from the date of this Agreement" and substituting in lieu thereof the date
        "May
        31, 2008".

       

      
        
           

        

        
           

          
          

        

        
           

        

      

      2. The
        remaining terms, provisions and conditions set forth in the Existing Credit
        Agreement (including without limitation, the consents, waivers and other
        provisions of Article XVII thereof) shall remain in full force and effect
        and
        are incorporated and adopted herein by reference. The Borrowers restate,
        confirm
        and ratify the warranties, covenants and representations set forth therein
        and
        further represent to the Lenders and the Agent that, as of the date hereof,
        no
        uncured Default or Event of Default exists under the Existing Credit Agreement,
        as amended by this Fourth Amendment (collectively, the "Credit Agreement").
        The
        Borrowers further confirm, grant and re-grant, pledge and re-pledge to the
        Agent
        for the ratable benefit of the Lenders a continuing and continuous, first
        and
        prior mortgage lien against, security interest in and collateral pledge in
        the
        Collateral more particularly described in Article IX of the Existing Credit
        Agreement. 

       

      3. The
        Borrowers shall execute and deliver, or cause to be executed and delivered
        to
        the Agent for the benefit of the Lenders, each of the following as express
        conditions precedent to the effectiveness of the amendments and modifications
        contemplated by this Fourth Amendment:

       

      a. this
        Fourth Amendment;

       

      b. the
        replacement Notes in favor of and payable to the order of the respective
        Lenders
        in the respective original face principal amounts as set forth in Schedule
        2
        annexed hereto; and

       

      c. corporate
        incumbency and no default certificates from each of the Borrowers, with
        resolutions attached, in form, scope and content acceptable to the
        Agent.

       

      4. The
        Borrowers agree to pay to the Agent on demand all costs, fees and expenses
        (including without limitation) reasonable attorneys fees and legal expenses
        incurred or accrued by the Agent in connection with the preparation,
        negotiation, execution, closing, delivery, and administration of this Fourth
        Amendment. 

       

      5. Any
        capitalized term used herein but not otherwise defined shall have the meaning
        given to such term in the Existing Credit Agreement.

       

      

      SEE
        NEXT PAGE FOR SIGNATURES

       

      

       

      

       

      
        
          -2-

        

        
           

          
          

        

        
           

        

      

       

      IN
        WITNESS WHEREOF, the parties hereto have caused this Fourth Amendment to
        be duly
        executed and delivered in Tulsa, Oklahoma, effective as of the day and year
        first above written.

       

      UNIT
        CORPORATION,
        a
        Delaware corporation,

      SUPERIOR
        PIPELINE COMPANY, L.L.C.,

      an
        Oklahoma limited liability company,

      UNIT
        PETROLEUM COMPANY,
        an
        Oklahoma

      corporation,

      UNIT
        DRILLING COMPANY,
        an
        Oklahoma

      corporation,

      PETROLEUM
        SUPPLY COMPANY,
        an

      Oklahoma
        corporation,

      UNIT
        ENERGY CANADA INC.,
        an
        Alberta,

      Canada
        corporation, and

      UNIT
        TEXAS DRILLING, L.L.C.,
        an
        Oklahoma

      limited
        liability company

       

      By       
        /s/ Larry D.
        Pinkston                       

                 
        Larry D. Pinkston, President of each of

               
          UNIT CORPORATION,

                 
        UNIT PETROLEUM COMPANY,

                 
        UNIT DRILLING COMPANY,

                 
        PETROLEUM SUPPLY COMPANY,

                 
        UNIT ENERGY CANADA INC., 

                 
        as Manager of UNIT TEXAS DRILLING,

                  L.L.C.,
        and SUPERIOR PIPELINE

                 
        COMPANY, L.L.C.

       

                 
        7130 Sourth Lewis Avenue, Suite 1000

                 
        Tulsa, Oklahoma 74136

                 
        Attention: Larry Pinkston

                 
        Telephone: (918) 493-7700

                 
        Facsimile: (918) 493-7711

       

      
        
          -3-

        

        
          
          

          
          

        

        
          
          

        

      

      BANK
        OF OKLAHOMA, NATIONAL

      ASSOCIATION,
        in its
        individual corporate

      capacity
        as a Lender, as LC Issuer and as

      Administrative
        Agent for the Lenders

       

      By     
        /s/ Pam
        Schloeder                                      

                 
        Pam Schloeder

                 
        Senior Vice President

       

                 
        101 East Second Street

                 
        Bank of Oklahoma Tower

                 
        One Williams Center

                 
        Tulsa, Oklahoma 74192

                 
        Telephone: (918) 588-6012

                 
        Facsimile: (918) 588-6880

       

       

       

       

       

       

       

       

       

      
 

      
        -4-
          
          

        

        
          
          

          
          

        

        
          
          

        

      

      BANK
        OF AMERICA, N.A.,
        a
        Lender

       

      By      
        /s/ Christen A.
        Lacey                

                 
        Christen A. Lacey

                 
        Principal

       

                 
        100 Federal Street

                 
        Boston, MA 02110

                 
        Telephone: (617) 434-6816

                 
        Facsimile: (617) 434-3652

       

       

       

       

       

       

       

       

       

      
 

       

      
        
          -5-

        

        
          
          

          
          

        

        
          
          

        

      

      BMO
        CAPITAL MARKETS FINANCING,

      INC.,
        formerly
Harris
        Nesbitt Financing, Inc.,

      a
        Lender

       

      By       
        /s/ Mary Lou
        Allen                   

                 
        Mary Lou Allen,

                 
        Vice President

       

                 
        Bank of Montreal

                 
        Houston Agency

                 
        700 Louisiana Street

                 
        4400 Bank of America Center

                 
        Houston, Texas 77002

                 
        Telephone: (713) 546-9761

                 
        Facsimile: (713) 223-4007

       

       

       

       

       

       

       

       

       

       

       

       

      
        
          -6-

        

        
          
          

          
          

        

        
          
          

        

      

      COMPASS
        BANK,
        a
        Lender

       

      By     
        /s/ Kathleen J.
        Bowen               

                 
        Kathleen J. Bowen

                 
        Senior Vice President

       

                 
        24 Greenway Plaza

                 
        Suite 1400A

                 
        Houston, Texas 77046

                 
        Telephone: (713) 968-8273

                 
        Facsimile: (713) 968-8292

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

      
        
          -7-

        

        
          
          

          
          

        

        
          
          

        

      

      

        PROMISSORY
          NOTE

         

        (Bank
          of
          Oklahoma, National Association)

         

        $81,911,500.00

        January
          25, 2007

        Tulsa,
          Oklahoma

         

        FOR
          VALUE
          RECEIVED, the undersigned, UNIT CORPORATION, a Delaware corporation, SUPERIOR
          PIPELINE COMPANY, L.L.C., an Oklahoma limited liability company, UNIT DRILLING
          COMPANY, an Oklahoma corporation, UNIT PETROLEUM COMPANY, an Oklahoma
          corporation, PETROLEUM SUPPLY COMPANY, an Oklahoma corporation, UNIT ENERGY
          CANADA INC., an Alberta, Canada corporation, and UNIT TEXAS DRILLING, L.L.C.,
          an
          Oklahoma limited liability company (individually and collectively the
          "Borrowers"), jointly and severally promise to pay to the order of BANK
          OF
          OKLAHOMA, NATIONAL ASSOCIATION ("BOk"), with interest, the principal sum
          of
          EIGHTY ONE MILLION NINE HUNDRED ELEVEN THOUSAND FIVE HUNDRED and NO/100ths
          DOLLARS ($81,911,500.00) or, if less, the aggregate principal amount of
          all
          advances outstanding from time to time hereunder, made by BOk to Borrowers
          pursuant to the Credit Agreement (hereinafter defined) and unless otherwise
          provided in the Credit Agreement, the principal balance of this Note outstanding
          on the Facility Termination Date, with interest payments due on each applicable
          Payment Date. This Note is issued pursuant to and subject to the terms
          of a
          certain Credit Agreement dated as of January 30, 2004, as amended by the
          First
          Amendment thereto dated as of June 1, 2005, as further amended by the Second
          Amendment thereto dated as of November 4, 2005, as further amended by the
          Third
          Amendment thereto dated as of October 10, 2006, and as further amended
          by the
          Fourth Amendment thereto dated as of January 25, 2007, among Borrowers,
          and BOk,
          Bank of America, N.A., BMO Capital Markets Financing, Inc., formerly Harris
          Nesbitt Financing, Inc., and Compass Bank (collectively the "Lenders"),
          with BOk
          as the Administrative Agent (in such capacity, the "Administrative Agent")
          (such
          Credit Agreement, as amended by the First Amendment, the Second Amendment,
          the
          Third Amendment and the Fourth Amendment, respectively, and as hereafter
          amended, modified, supplemented or restated from time to time collectively
          referred to as the "Credit Agreement"). Capitalized terms used and not
          otherwise
          defined herein shall have the meanings assigned to them in the Credit
          Agreement.

         

        Except
          as
          hereinafter provided in connection with a Default, interest shall accrue
          on the
          outstanding principal balance hereof and on any past due interest to the
          Facility Termination Date at the rate or rates per annum determined pursuant
          to
          the Pricing Schedule annexed to the Credit Agreement, as provided in and
          calculated pursuant to the Credit Agreement.

         

        The
          rate
          of interest payable upon the indebtedness evidenced by this Note shall
          not at
          any time exceed the maximum rate of interest permitted under the laws of
          the
          State of Oklahoma or federal laws to the extent they apply to loans of
          the type
          and character evidenced by this Note.

         

        All
          payments under this Note shall be made in legal tender of the United States
          of
          America or in other immediately available funds at the offices of the
          Administrative Agent at Bank of Oklahoma Tower, One Williams Center, Seven
          East
          Second Street, Tulsa, Oklahoma 74172, and no credit shall be given for
          any
          payment received by check, draft or other instrument

         

        
          
             

          

          
             

            
            

          

          
             
or
            item
            until such time as the Administrative Agent or the holder hereof shall
            have
            received credit therefor from the Administrative Agent's or the holder's
            collecting agent or, in the event no collecting agent is used, from the
            bank or
            other financial institution upon which said check, draft or other instrument
            or
            item is drawn. If any payment is due upon a Saturday or Sunday or upon
            any other
            day on which state or national banks in the State of Oklahoma are closed
            for
            business by virtue of a legal holiday for such banks, such payment shall
            be due
            and payable on the next succeeding Business Day, and interest shall accrue
            to
            such day.

        

         

        The
          Borrowers may borrow and reborrow hereunder at any time and from time to
          time as
          provided in the Credit Agreement and may prepay this Note in whole or in
          part,
          subject to the prepayment limitations contained in the Credit Agreement;
          provided, however, that any partial prepayment shall be applied first to
          accrued
          interest, then to the unpaid principal balance hereof.

         

        From
          time
          to time the Borrowers and the Lenders may agree to extend the maturity
          date of
          this Note or to renew this Note, in whole or in part, or a new note of
          different
          form may be substituted for this Note and/or the rate of interest may be
          changed, or changes may be made in consideration of loan extensions, and
          the
          holder, from time to time, may waive or surrender, either in whole or in
          part,
          any rights, guarantees, security interests, or liens given for the benefit
          of
          the holder in connection with the payment and the securing the payment
          of this
          Note; but no such occurrences shall in any manner affect, limit, modify
          or
          otherwise impair any rights, guarantees or security of the holder not
          specifically waived, released or surrendered in writing, nor shall the
          Borrowers
          or any guarantor, endorser or any other person who is or might be liable
          hereon,
          either primarily or contingently, be released from such liability by reason
          of
          the occurrence of any such event. The holder hereof, from time to time,
          shall
          have the unlimited right to release any person who might be liable hereon;
          and
          such release shall not affect or discharge the liability of any other person
          who
          is or might be liable hereon.

         

        This
          Note
          is subject to and governed by the terms, provisions, conditions and limitations
          of the Credit Agreement concerning, among other matters, acceleration following
          a Default, imposition of default rates of interest during the continuance
          of a
          Default, methods of payment, minimum amounts of each Advance, selection
          of the
          type of Advance and applicable Interest Period for new Advances, Borrowing
          Base
          calculations, Maximum Credit Amount, Aggregate Commitment amounts, security
          interests in Rigs and deposit accounts of the Borrowers with the Administrative
          Agent and any of the Lenders, rights of set off or offset in connection
          therewith and all other matters terms, provisions and agreements therein
          prescribed or governed. 

         

        The
          Borrowers and all endorsers, guarantors and sureties hereby severally waive
          protest, presentment, demand, and notice of protest and nonpayment in case
          this
          Note or any payment due hereunder is not paid when due; and they agree
          to any
          renewal of this Note or to any extension, acceleration or postponement
          of the
          time of payment, or any other indulgence, to any substituting, exchange
          or
          release of collateral and to the release of any party or person primarily
          or
          contingently liable hereon without prejudice to the holder and without
          notice to
          the Borrowers or any endorser, guarantor or surety. In the event of any
          controversy, claim or dispute among the parties affecting or relating to
          the
          subject matter or performance of this Note, the prevailing party shall
          be
          entitled to recover from the non-prevailing party all of its reasonable
          costs,
          expenses, including reasonable attorneys' and accountants' fees. In the
          event
          the Administrative Agent or

         

        
          
            2

          

          
             

            
            

          

          
             
BOk
            is
            the prevailing party, the Borrowers, and any guarantor, endorser, surety
            or any
            other person who is or may become liable hereon, will, on demand, pay
            all such
            costs and expenses.

        

         

        This
          Note
          is secured by the Collateral described in the Credit Agreement, which provides,
          among other things, for prepayment of this Note upon the occurrence of
          certain
          events and for limitations on Advances that may be made hereunder. This
          Note is
          a replacement and extension of that certain promissory note dated as of
          October
          10, 2006, payable by the Borrowers to the order of BOk in the original
          principal
          amount of $81,911,500.00. 

         

        This
          Note
          is issued by the Borrowers in accordance with the provisions of Section
          2.14(iv)
          of the Credit Agreement and shall be governed by and construed in accordance
          with the laws of the State of Oklahoma. Borrowers agree that all suits
          or
          proceedings arising from or related to this Note or the Credit Agreement
          may be
          litigated in courts, state or federal, sitting in Tulsa County, State of
          Oklahoma. In furtherance of this provision, Borrowers hereby waive any
          objection
          to such venue.

         

        Notwithstanding
          the single execution of this Note by the undersigned President of each
          of the
          corporate Borrowers and the manager of the limited liability companies
          Borrower,
          as applicable, each of the Borrowers is jointly and severally bound by
          the terms
          of this Note.

         

        UNIT
          CORPORATION,
          a
          Delaware corporation,

        SUPERIOR
          PIPELINE COMPANY, L.L.C.,

        an
          Oklahoma limited liability company,

        UNIT
          PETROLEUM COMPANY,
          an
          Oklahoma

        corporation,

        UNIT
          DRILLING COMPANY,
          an
          Oklahoma

        corporation,

        PETROLEUM
          SUPPLY COMPANY,
          an

        Oklahoma
          corporation, 

        UNIT
          ENERGY CANADA INC.,
          an
          Alberta,

        Canada
          corporation, and 

        UNIT
          TEXAS DRILLING, L.L.C.,
          an
          Oklahoma

        limited
          liability company

         

        By      
          /s/ Larry D.
          Pinkston              

                   
          Larry D. Pinkston, President of each of

                   
          UNIT CORPORATION, 

                   
          UNIT PETROLEUM COMPANY, 

                   
          UNIT DRILLING COMPANY,

                   
          PETROLEUM SUPPLY COMPANY,

                   
          UNIT ENERGY CANADA INC.,

                   
          as Manager of UNIT TEXAS DRILLING,

                   
          L.L.C., and SUPERIOR PIPELINE

                    COMPANY,
          L.L.C.

         

        

        
          
            3

          

          
            
            

            
            

          

          
            
            

          

        

      

      

        PROMISSORY
          NOTE

         

        (Bank
          of
          America, N.A.)

         

        $76,065,000.00

        January
          25, 2007

        Tulsa,
          Oklahoma

         

        FOR
          VALUE
          RECEIVED, the undersigned, UNIT CORPORATION, a Delaware corporation, SUPERIOR
          PIPELINE COMPANY, L.L.C., an Oklahoma limited liability company, UNIT DRILLING
          COMPANY, an Oklahoma corporation, UNIT PETROLEUM COMPANY, an Oklahoma
          corporation, PETROLEUM SUPPLY COMPANY, an Oklahoma corporation, UNIT ENERGY
          CANADA INC., an Alberta, Canada corporation, and UNIT TEXAS DRILING, L.L.C.,
          an
          Oklahoma limited liability company (individually and collectively the
          "Borrowers"), jointly and severally promise to pay to the order of BANK
          OF
          AMERICA, N.A. ("B of A"), with interest, the principal sum of SEVENTY SIX
          MILLION SIXTY-FIVE THOUSAND and NO/100ths DOLLARS ($76,065,000.00) or,
          if less,
          the aggregate principal amount of all advances outstanding from time to
          time
          hereunder, made by B of A to Borrowers pursuant to the Credit Agreement
          (hereinafter defined) and unless otherwise provided in the Credit Agreement,
          the
          principal balance of this Note outstanding on the Facility Termination
          Date,
          with interest payments due on each applicable Payment Date. This Note is
          issued
          pursuant to and subject to the terms of a certain Credit Agreement dated
          as of
          January 30, 2004, as amended by the First Amendment thereto dated as of
          June 1,
          2005, and as further amended by the Second Amendment thereto dated as of
          November 4, 2005, as further amended by the Third Amendment thereto dated
          as of
          October 10, 2006, and as further amended by the Fourth Amendment thereto
          dated
          as of January 25, 2007, among Borrowers, and B of A, Bank of Oklahoma,
          National
          Association, BMO Capital Markets Financing, Inc., formerly Harris Nesbitt
          Financing, Inc., and Compass Bank (collectively the "Lenders"), with Bank
          of
          Oklahoma, National Association, as the Administrative Agent (in such capacity,
          the "Administrative Agent") (such Credit Agreement, as amended by the First
          Amendment, the Second Amendment, the Third Amendment, and the Fourth Amendment,
          respectively, and hereafter amended, modified, supplemented or restated
          from
          time to time collectively referred to as the "Credit Agreement"). Capitalized
          terms used and not otherwise defined herein shall have the meanings assigned
          to
          them in the Credit Agreement.

         

        Except
          as
          hereinafter provided in connection with a Default, interest shall accrue
          on the
          outstanding principal balance hereof and on any past due interest to the
          Facility Termination Date at the rate or rates per annum determined pursuant
          to
          the Pricing Schedule annexed to the Credit Agreement, as provided in and
          calculated pursuant to the Credit Agreement.

         

        The
          rate
          of interest payable upon the indebtedness evidenced by this Note shall
          not at
          any time exceed the maximum rate of interest permitted under the laws of
          the
          State of Oklahoma or federal laws to the extent they apply to loans of
          the type
          and character evidenced by this Note.

         

        All
          payments under this Note shall be made in legal tender of the United States
          of
          America or in other immediately available funds at the offices of the
          Administrative Agent at Bank of Oklahoma Tower, One Williams Center, Seven
          East
          Second Street, Tulsa, Oklahoma 74172, and no credit shall be given for
          any
          payment received by check, draft or other instrument

         

        
          
             

          

          
             

            
            

          

          
             
or
            item
            until such time as the Administrative Agent or the holder hereof shall
            have
            received credit therefor from the Administrative Agent's or the holder's
            collecting agent or, in the event no collecting agent is used, from the
            bank or
            other financial institution upon which said check, draft or other instrument
            or
            item is drawn. If any payment is due upon a Saturday or Sunday or upon
            any other
            day on which state or national banks in the State of Oklahoma are closed
            for
            business by virtue of a legal holiday for such banks, such payment shall
            be due
            and payable on the next succeeding Business Day, and interest shall accrue
            to
            such day.

        

         

        The
          Borrowers may borrow and reborrow hereunder at any time and from time to
          time as
          provided in the Credit Agreement and may prepay this Note in whole or in
          part,
          subject to the prepayment limitations contained in the Credit Agreement;
          provided, however, that any partial prepayment shall be applied first to
          accrued
          interest, then to the unpaid principal balance hereof.

         

        From
          time
          to time the Borrowers and the Lenders may agree to extend the maturity
          date of
          this Note or to renew this Note, in whole or in part, or a new note of
          different
          form may be substituted for this Note and/or the rate of interest may be
          changed, or changes may be made in consideration of loan extensions, and
          the
          holder, from time to time, may waive or surrender, either in whole or in
          part,
          any rights, guarantees, security interests, or liens given for the benefit
          of
          the holder in connection with the payment and the securing the payment
          of this
          Note; but no such occurrences shall in any manner affect, limit, modify
          or
          otherwise impair any rights, guarantees or security of the holder not
          specifically waived, released or surrendered in writing, nor shall the
          Borrowers
          or any guarantor, endorser or any other person who is or might be liable
          hereon,
          either primarily or contingently, be released from such liability by reason
          of
          the occurrence of any such event. The holder hereof, from time to time,
          shall
          have the unlimited right to release any person who might be liable hereon;
          and
          such release shall not affect or discharge the liability of any other person
          who
          is or might be liable hereon.

         

        This
          Note
          is subject to and governed by the terms, provisions, conditions and limitations
          of the Credit Agreement concerning, among other matters, acceleration following
          a Default, imposition of default rates of interest during the continuance
          of a
          Default, methods of payment, minimum amounts of each Advance, selection
          of the
          type of Advance and applicable Interest Period for new Advances, Borrowing
          Base
          calculations, Maximum Credit Amount, Aggregate Commitment amounts, security
          interests in Rigs and deposit accounts of the Borrowers with the Administrative
          Agent and any of the Lenders, rights of set off or offset in connection
          therewith and all other matters terms, provisions and agreements therein
          prescribed or governed. 

         

        The
          Borrowers and all endorsers, guarantors and sureties hereby severally waive
          protest, presentment, demand, and notice of protest and nonpayment in case
          this
          Note or any payment due hereunder is not paid when due; and they agree
          to any
          renewal of this Note or to any extension, acceleration or postponement
          of the
          time of payment, or any other indulgence, to any substituting, exchange
          or
          release of collateral and to the release of any party or person primarily
          or
          contingently liable hereon without prejudice to the holder and without
          notice to
          the Borrowers or any endorser, guarantor or surety. In the event of any
          controversy, claim or dispute among the parties affecting or relating to
          the
          subject matter or performance of this Note, the prevailing party shall
          be
          entitled to recover from the non-prevailing party all of its reasonable
          costs,
          expenses, including reasonable attorneys' and accountants' fees. In the
          event
          the Administrative Agent or

         

        
          
            2

          

          
             

            
            

          

          
             
BOk
            is
            the prevailing party, the Borrowers, and any guarantor, endorser, surety
            or any
            other person who is or may become liable hereon, will, on demand, pay
            all such
            costs and expenses.

        

         

        This
          Note
          is secured by the Collateral described in the Credit Agreement, which provides,
          among other things, for prepayment of this Note upon the occurrence of
          certain
          events and for limitations on Advances that may be made hereunder. This
          Note is
          a replacement and extension of that certain promissory note dated as of
          October
          10, 2006, payable by the Borrowers to the order of B of A in the original
          principal amount of $76,065,000.00. 

         

        This
          Note
          is issued by the Borrowers in accordance with the provisions of Section
          2.14(iv)
          of the Credit Agreement and shall be governed by and construed in accordance
          with the laws of the State of Oklahoma. Borrowers agree that all suits
          or
          proceedings arising from or related to this Note or the Credit Agreement
          may be
          litigated in courts, state or federal, sitting in Tulsa County, State of
          Oklahoma. In furtherance of this provision, Borrowers hereby waive any
          objection
          to such venue.

         

        Notwithstanding
          the single execution of this Note by the undersigned President of each
          of the
          corporate Borrowers and the Manager of the limited liability companies
          Borrower,
          as applicable, each of the Borrowers is jointly and severally bound by
          the terms
          of this Note.

         

        UNIT
          CORPORATION,
          a
          Delaware corporation,

        SUPERIOR
          PIPELINE COMPANY, L.L.C.,

        an
          Oklahoma limited liability company,

        UNIT
          PETROLEUM COMPANY,
          an
          Oklahoma

        corporation,

        UNIT
          DRILLING COMPANY,
          an
          Oklahoma

        corporation,

        PETROLEUM
          SUPPLY COMPANY,
          an

        Oklahoma
          corporation, 

        UNIT
          ENERGY CANADA INC.,
          an
          Alberta,

        Canada
          corporation, and

        UNIT
          TEXAS DRILLING, L.L.C.,
          an
          Oklahoma

        limited
          liability company

         

        By      
          /s/ Larry D.
          Pinkston               

                   
          Larry D. Pinkston, President of each of

                   
          UNIT CORPORATION,

                   
          UNIT PETROLEUM COMPANY, 

                   
          UNIT DRILLING COMPANY,

                   
          PETROLEUM SUPPLY COMPANY,

                   
          UNIT ENERGY CANADA INC.,

                   
          as Manager of UNIT TEXAS DRILLING,

                   
          L.L.C., and SUPERIOR PIPELINE

                   
          COMPANY, L.L.C.

         

         

        
          
            3

          

          
            
            

            
            

          

          
            
            

          

        

      

      

        PROMISSORY
          NOTE

         

        (BMO
          Capital Markets Financing, Inc.)

         

        $76,065,000.00

        January
          25, 2007

        Tulsa,
          Oklahoma

         

        FOR
          VALUE
          RECEIVED, the undersigned, UNIT CORPORATION, a Delaware corporation, SUPERIOR
          PIPELINE COMPANY, L.L.C., an Oklahoma limited liability company, UNIT DRILLING
          COMPANY, an Oklahoma corporation, UNIT PETROLEUM COMPANY, an Oklahoma
          corporation, PETROLEUM SUPPLY COMPANY, an Oklahoma corporation, UNIT ENERGY
          CANADA INC., an Alberta, Canada corporation, and UNIT TEXAS DRILING, L.L.C.,
          an
          Oklahoma limited liability company (individually and collectively the
          "Borrowers"), jointly and severally promise to pay to the order of BMO
          CAPITAL
          MARKETS FINANCING, INC formerly Harris Nesbitt Financing, Inc. ("BMO"),
          with
          interest, the principal sum of SEVENTY SIX MILLION SIXTY-FIVE THOUSAND
          and
          NO/100ths DOLLARS ($76,065,000.00) or, if less, the aggregate principal
          amount
          of all advances outstanding from time to time hereunder, made by BMO to
          Borrowers pursuant to the Credit Agreement (hereinafter defined) and unless
          otherwise provided in the Credit Agreement, the principal balance of this
          Note
          outstanding on the Facility Termination Date, with interest payments due
          on each
          applicable Payment Date. This Note is issued pursuant to and subject to
          the
          terms of a certain Credit Agreement dated as of January 30, 2004, as amended
          by
          the First Amendment thereto dated as of June 1, 2005, as further amended
          by the
          Second Amendment thereto dated as of November 4, 2005, as further amended
          by the
          Third Amendment thereto dated as of October 10, 2006, and as further amended
          by
          this Fourth Amendment thereto dated as of January 25, 2007, among Borrowers,
          and
          BMO, Bank of Oklahoma, National Association, Bank of America, N.A., and
          Compass
          Bank (collectively the "Lenders"), with Bank of Oklahoma, National Association,
          as the Administrative Agent (in such capacity, the "Administrative Agent")
          (such
          Credit Agreement, as amended by the First Amendment, the Second Amendment,
          the
          Third Amendment, and the Fourth Amendment, respectively, and as hereafter
          amended, modified, supplemented or restated from time to time referred
          to as the
          "Credit Agreement"). Capitalized terms used and not otherwise defined herein
          shall have the meanings assigned to them in the Credit Agreement.

         

        Except
          as
          hereinafter provided in connection with a Default, interest shall accrue
          on the
          outstanding principal balance hereof and on any past due interest to the
          Facility Termination Date at the rate or rates per annum determined pursuant
          to
          the Pricing Schedule annexed to the Credit Agreement, as provided in and
          calculated pursuant to the Credit Agreement.

         

        The
          rate
          of interest payable upon the indebtedness evidenced by this Note shall
          not at
          any time exceed the maximum rate of interest permitted under the laws of
          the
          State of Oklahoma or federal laws to the extent they apply to loans of
          the type
          and character evidenced by this Note.

         

        All
          payments under this Note shall be made in legal tender of the United States
          of
          America or in other immediately available funds at the offices of the
          Administrative Agent at Bank of Oklahoma Tower, One Williams Center, Seven
          East
          Second Street, Tulsa, Oklahoma 74172, and no credit shall be given for
          any
          payment received by check, draft or other instrument

         

        
          
             

          

          
             

            
            

          

          
             
or
            item
            until such time as the Administrative Agent or the holder hereof shall
            have
            received credit therefor from the Administrative Agent's or the holder's
            collecting agent or, in the event no collecting agent is used, from the
            bank or
            other financial institution upon which said check, draft or other instrument
            or
            item is drawn. If any payment is due upon a Saturday or Sunday or upon
            any other
            day on which state or national banks in the State of Oklahoma are closed
            for
            business by virtue of a legal holiday for such banks, such payment shall
            be due
            and payable on the next succeeding Business Day, and interest shall accrue
            to
            such day.

        

         

        The
          Borrowers may borrow and reborrow hereunder at any time and from time to
          time as
          provided in the Credit Agreement and may prepay this Note in whole or in
          part,
          subject to the prepayment limitations contained in the Credit Agreement;
          provided, however, that any partial prepayment shall be applied first to
          accrued
          interest, then to the unpaid principal balance hereof.

         

        From
          time
          to time the Borrowers and the Lenders may agree to extend the maturity
          date of
          this Note or to renew this Note, in whole or in part, or a new note of
          different
          form may be substituted for this Note and/or the rate of interest may be
          changed, or changes may be made in consideration of loan extensions, and
          the
          holder, from time to time, may waive or surrender, either in whole or in
          part,
          any rights, guarantees, security interests, or liens given for the benefit
          of
          the holder in connection with the payment and the securing the payment
          of this
          Note; but no such occurrences shall in any manner affect, limit, modify
          or
          otherwise impair any rights, guarantees or security of the holder not
          specifically waived, released or surrendered in writing, nor shall the
          Borrowers
          or any guarantor, endorser or any other person who is or might be liable
          hereon,
          either primarily or contingently, be released from such liability by reason
          of
          the occurrence of any such event. The holder hereof, from time to time,
          shall
          have the unlimited right to release any person who might be liable hereon;
          and
          such release shall not affect or discharge the liability of any other person
          who
          is or might be liable hereon.

         

        This
          Note
          is subject to and governed by the terms, provisions, conditions and limitations
          of the Credit Agreement concerning, among other matters, acceleration following
          a Default, imposition of default rates of interest during the continuance
          of a
          Default, methods of payment, minimum amounts of each Advance, selection
          of the
          type of Advance and applicable Interest Period for new Advances, Borrowing
          Base
          calculations, Maximum Credit Amount, Aggregate Commitment amounts, security
          interests in Rigs and deposit accounts of the Borrowers with the Administrative
          Agent and any of the Lenders, rights of set off or offset in connection
          therewith and all other matters terms, provisions and agreements therein
          prescribed or governed. 

         

        The
          Borrowers and all endorsers, guarantors and sureties hereby severally waive
          protest, presentment, demand, and notice of protest and nonpayment in case
          this
          Note or any payment due hereunder is not paid when due; and they agree
          to any
          renewal of this Note or to any extension, acceleration or postponement
          of the
          time of payment, or any other indulgence, to any substituting, exchange
          or
          release of collateral and to the release of any party or person primarily
          or
          contingently liable hereon without prejudice to the holder and without
          notice to
          the Borrowers or any endorser, guarantor or surety. In the event of any
          controversy, claim or dispute among the parties affecting or relating to
          the
          subject matter or performance of this Note, the prevailing party shall
          be
          entitled to recover from the non-prevailing party all of its reasonable
          costs,
          expenses, including reasonable attorneys' and accountants' fees. In the
          event
          the Administrative Agent or

         

        
          
            2

          

          
             

            
            

          

          
             
BOk
            is
            the prevailing party, the Borrowers, and any guarantor, endorser, surety
            or any
            other person who is or may become liable hereon, will, on demand, pay
            all such
            costs and expenses.

        

         

        This
          Note
          is secured by the Collateral described in the Credit Agreement, which provides,
          among other things, for prepayment of this Note upon the occurrence of
          certain
          events and for limitations on Advances that may be made hereunder. This
          Note is
          a replacement and extension of that certain promissory note from the Borrowers
          payable to the order BMO dated as of October 10, 2006, in the original
          principal
          amount of $76,065,000.00. 

         

        This
          Note
          is issued by the Borrowers in accordance with the provisions of Section
          2.14(iv)
          of the Credit Agreement and shall be governed by and construed in accordance
          with the laws of the State of Oklahoma. Borrowers agree that all suits
          or
          proceedings arising from or related to this Note or the Credit Agreement
          may be
          litigated in courts, state or federal, sitting in Tulsa County, State of
          Oklahoma. In furtherance of this provision, Borrowers hereby waive any
          objection
          to such venue.

         

        Notwithstanding
          the single execution of this Note by the undersigned President of each
          of the
          corporate Borrowers and the manager of the limited liability companies
          Borrower,
          as applicable, each of the Borrowers is jointly and severally bound by
          the terms
          of this Note.

         

        UNIT
          CORPORATION,
          a
          Delaware corporation,

        SUPERIOR
          PIPELINE COMPANY, L.L.C.,

        an
          Oklahoma limited liability company,

        UNIT
          PETROLEUM COMPANY,
          an
          Oklahoma

        corporation,

        UNIT
          DRILLING COMPANY,
          an
          Oklahoma

        corporation,

        PETROLEUM
          SUPPLY COMPANY,
          an

        Oklahoma
          corporation, 

        UNIT
          ENERGY CANADA INC.,
          an
          Alberta,

        Canada
          corporation, and 

        UNIT
          TEXAS DRILLING, L.L.C.,
          an
          Oklahoma

        limited
          liability company

         

        By      
          /s/ Larry D.
          Pinkston            

                   
          Larry D. Pinkston, President of each of

                   
          UNIT CORPORATION, 

                   
          UNIT PETROLEUM COPANY, 

                   
          UNIT DRILLING COMPANY, 

                   
          PETROLEUM SUPPLY COMPANY,

                   
          UNIT ENERGY CANADA INC., 

                   
          as Manager of UNIT TEXAS DRILLING,

                   
          L.L.C., and SUPERIOR PIPELINE

                   
          COMPANY, L.L.C.

         

        

        
          
            3

          

          
            
            

            
            

          

          
            
            

          

        

      

      

        PROMISSORY
          NOTE

         

        (Compass
          Bank)

         

        $40,958,500.00

        January
          25, 2007

        Tulsa,
          Oklahoma

         

        FOR
          VALUE
          RECEIVED, the undersigned, UNIT CORPORATION, a Delaware corporation, SUPERIOR
          PIPELINE COMPANY, L.L.C., an Oklahoma limited liability company, UNIT DRILLING
          COMPANY, an Oklahoma corporation, UNIT PETROLEUM COMPANY, an Oklahoma
          corporation, PETROLEUM SUPPLY COMPANY, an Oklahoma corporation, UNIT ENERGY
          CANADA INC., an Alberta, Canada corporation, and UNIT TEXAS DRILING, L.L.C.,
          an
          Oklahoma limited liability company (individually and collectively the
          "Borrowers"), jointly and severally promise to pay to the order of COMPASS
          BANK
          ("Compass"), with interest, the principal sum of FORTY MILLION NINE HUNDRED
          FIFTY EIGHT THOUSAND FIVE HUNDRED and NO/100ths DOLLARS ($40,958,500.00)
          or, if
          less, the aggregate principal amount of all advances outstanding from time
          to
          time hereunder, made by Compass to Borrowers pursuant to the Credit Agreement
          (hereinafter defined) and unless otherwise provided in the Credit Agreement,
          the
          principal balance of this Note outstanding on the Facility Termination
          Date,
          with interest payments due on each applicable Payment Date. This Note is
          issued
          pursuant to and subject to the terms of a certain Credit Agreement dated
          as of
          January 30, 2004, as amended by the First Amendment thereto dated as of
          June 1,
          2005, and as further amended by the Second Amendment thereto dated as of
          November 4, 2005, as further amended by the Third Amendment thereto dated
          as of
          October 10, 2006, and as further amended by the Fourth Amendment thereto
          dated
          as of January 25, 2007, among Borrowers, and Compass, Bank of Oklahoma,
          National
          Association, Bank of America, N.A., and BMO Capital Markets Financing,
          Inc.,
          formerly Harris Nesbitt Financing, Inc. (collectively the "Lenders"), with
          Bank
          of Oklahoma, National Association, as the Administrative Agent (in such
          capacity, the "Administrative Agent") (such Credit Agreement, as amended
          by the
          First Amendment, the Second Amendment, the Third Amendment, and the Fourth
          Amendment, respectively, and as hereafter amended, modified, supplemented
          or
          restated from time to time collectively referred to as the "Credit Agreement").
          Capitalized terms used and not otherwise defined herein shall have the
          meanings
          assigned to them in the Credit Agreement.

         

        Except
          as
          hereinafter provided in connection with a Default, interest shall accrue
          on the
          outstanding principal balance hereof and on any past due interest to the
          Facility Termination Date at the rate or rates per annum determined pursuant
          to
          the Pricing Schedule annexed to the Credit Agreement, as provided in and
          calculated pursuant to the Credit Agreement.

         

        The
          rate
          of interest payable upon the indebtedness evidenced by this Note shall
          not at
          any time exceed the maximum rate of interest permitted under the laws of
          the
          State of Oklahoma or federal laws to the extent they apply to loans of
          the type
          and character evidenced by this Note.

         

        All
          payments under this Note shall be made in legal tender of the United States
          of
          America or in other immediately available funds at the offices of the
          Administrative Agent at Bank of Oklahoma Tower, One Williams Center, Seven
          East
          Second Street, Tulsa, Oklahoma 74172, and no credit shall be given for
          any
          payment received by check, draft or other instrument

         

        
          
             

          

          
             

            
            

          

          
             
or
            item
            until such time as the Administrative Agent or the holder hereof shall
            have
            received credit therefor from the Administrative Agent's or the holder's
            collecting agent or, in the event no collecting agent is used, from the
            bank or
            other financial institution upon which said check, draft or other instrument
            or
            item is drawn. If any payment is due upon a Saturday or Sunday or upon
            any other
            day on which state or national banks in the State of Oklahoma are closed
            for
            business by virtue of a legal holiday for such banks, such payment shall
            be due
            and payable on the next succeeding Business Day, and interest shall accrue
            to
            such day.

        

         

        The
          Borrowers may borrow and reborrow hereunder at any time and from time to
          time as
          provided in the Credit Agreement and may prepay this Note in whole or in
          part,
          subject to the prepayment limitations contained in the Credit Agreement;
          provided, however, that any partial prepayment shall be applied first to
          accrued
          interest, then to the unpaid principal balance hereof.

         

        From
          time
          to time the Borrowers and the Lenders may agree to extend the maturity
          date of
          this Note or to renew this Note, in whole or in part, or a new note of
          different
          form may be substituted for this Note and/or the rate of interest may be
          changed, or changes may be made in consideration of loan extensions, and
          the
          holder, from time to time, may waive or surrender, either in whole or in
          part,
          any rights, guarantees, security interests, or liens given for the benefit
          of
          the holder in connection with the payment and the securing the payment
          of this
          Note; but no such occurrences shall in any manner affect, limit, modify
          or
          otherwise impair any rights, guarantees or security of the holder not
          specifically waived, released or surrendered in writing, nor shall the
          Borrowers
          or any guarantor, endorser or any other person who is or might be liable
          hereon,
          either primarily or contingently, be released from such liability by reason
          of
          the occurrence of any such event. The holder hereof, from time to time,
          shall
          have the unlimited right to release any person who might be liable hereon;
          and
          such release shall not affect or discharge the liability of any other person
          who
          is or might be liable hereon.

         

        This
          Note
          is subject to and governed by the terms, provisions, conditions and limitations
          of the Credit Agreement concerning, among other matters, acceleration following
          a Default, imposition of default rates of interest during the continuance
          of a
          Default, methods of payment, minimum amounts of each Advance, selection
          of the
          type of Advance and applicable Interest Period for new Advances, Borrowing
          Base
          calculations, Maximum Credit Amount, Aggregate Commitment amounts, security
          interests in Rigs and deposit accounts of the Borrowers with the Administrative
          Agent and any of the Lenders, rights of set off or offset in connection
          therewith and all other matters terms, provisions and agreements therein
          prescribed or governed. 

         

        The
          Borrowers and all endorsers, guarantors and sureties hereby severally waive
          protest, presentment, demand, and notice of protest and nonpayment in case
          this
          Note or any payment due hereunder is not paid when due; and they agree
          to any
          renewal of this Note or to any extension, acceleration or postponement
          of the
          time of payment, or any other indulgence, to any substituting, exchange
          or
          release of collateral and to the release of any party or person primarily
          or
          contingently liable hereon without prejudice to the holder and without
          notice to
          the Borrowers or any endorser, guarantor or surety. In the event of any
          controversy, claim or dispute among the parties affecting or relating to
          the
          subject matter or performance of this Note, the prevailing party shall
          be
          entitled to recover from the non-prevailing party all of its reasonable
          costs,
          expenses, including reasonable attorneys' and accountants' fees. In the
          event
          the Administrative Agent or

         

        
          
            2

          

          
             

            
            

          

          
             
BOk
            is
            the prevailing party, the Borrowers, and any guarantor, endorser, surety
            or any
            other person who is or may become liable hereon, will, on demand, pay
            all such
            costs and expenses.

        

         

        This
          Note
          is secured by the Collateral described in the Credit Agreement, which provides,
          among other things, for prepayment of this Note upon the occurrence of
          certain
          events and for limitations on Advances that may be made hereunder. This
          Note is
          a replacement and extension of that certain promissory note dated as of
          October
          10, 2006, payable by the Borrowers to the order of Compass in the original
          principal amount of $40,958,500.00.

         

        This
          Note
          is issued by the Borrowers in accordance with the provisions of Section
          2.14(iv)
          of the Credit Agreement and shall be governed by and construed in accordance
          with the laws of the State of Oklahoma. Borrowers agree that all suits
          or
          proceedings arising from or related to this Note or the Credit Agreement
          may be
          litigated in courts, state or federal, sitting in Tulsa County, State of
          Oklahoma. In furtherance of this provision, Borrowers hereby waive any
          objection
          to such venue.

         

        Notwithstanding
          the single execution of this Note by the undersigned President of each
          of the
          corporate Borrowers and the manager of the limited liability companies
          Borrower,
          as applicable, each of the Borrowers is jointly and severally bound by
          the terms
          of this Note.

         

        UNIT
          CORPORATION,
          a
          Delaware corporation,

        SUPERIOR
          PIPELINE COMPANY, L.L.C.,

        an
          Oklahoma limited liability company,

        UNIT
          PETROLEUM COMPANY,
          an
          Oklahoma

        corporation,

        UNIT
          DRILLING COMPANY,
          an
          Oklahoma

        corporation,

        PETROLEUM
          SUPPLY COMPANY,
          an
          Oklahoma

        corporation,
          

        UNIT
          ENERGY CANADA INC.,
          an
          Alberta,

        Canada
          corporation, and 

        UNIT
          TEXAS DRILLING, L.L.C.,
          an
          Oklahoma

        limited
          liability company

         

        By      
          /s/ Larry D.
          Pinkston                

                   
          Larry D. Pinkston, President of each of

                   
          UNIT CORPORATION, 

                   
          UNIT PETROLEUM COMPANY, 

                   
          UNIT DRILLING COMPANY,

                   
          PETROLEUM SUPPLY COMPANY,

                   
          UNIT ENERGY CANADA INC.,

                   
          as Manager of UNIT TEXAS DRILLING,

                   
          L.L.C., and SUPERIOR PIPELINE

                   
          COMPANY, L.L.C.

         

        

      

      3exv10w2

 

Exhibit 10.2

AMENDMENT TO

ISOTIS SA

STOCK OPTION PLAN 2003/1

     THIS AMENDMENT TO THE ISOTIS SA STOCK OPTION PLAN 2003/1, made as of January 24, 2007, is
adopted by IsoTis SA, a Swiss corporation (Aktiengesellschaft) pursuant to article 620 et seq. of
the Swiss Code of Obligations, registered in Lausanne, Switzerland (the “Company”).
Capitalized terms used but not otherwise defined herein shall have the respective meanings ascribed
to them in the Plan (as defined below).

     WHEREAS, the Company maintains the IsoTis SA Stock Option Plan 2003/1 (the “Plan”);

     WHEREAS, pursuant to Section 2 of the Plan, the Company reserves the right to amend the Plan
by action of its Board of Directors (the “Board”); and

     NOW, THEREFORE, in consideration of the foregoing, the Plan is hereby amended as follows:

	 	1.	 	Section 9 is hereby amended and restated to read as follows:

     “In the event or in view of a merger or a sale of all or substantially all of the assets of the Company to
another person or entity or a dissolution or liquidation of the
Company, or the like (a “Covered
Transaction”), all existing Options will be terminated as of the effective date of the Covered Transaction,
except as otherwise decided by the Board, and the following rules shall apply:

	 	a)	 	Subject to paragraph b) below, the Board may at its sole discretion, prior to
the effective date of the Covered Transaction, (i) make each existing Option
exercisable in full, and/or (ii) change the duration period of each exercisable Option
such as all exercisable Options must be exercised within a period of 30 days minimum.
	 
	 	b)	 	With respect to existing Options held by a Participant who, following the
Covered Transaction, will be employed by or otherwise providing services to a
corporation which is the surviving or acquiring corporation in such transaction or an
affiliate of such corporation, the Board may, in lieu of the actions described in
paragraph a) above, arrange to have such surviving or acquiring corporation or
affiliate grant to the Participant replacement Options, which in the judgment of the
Board, are substantially equivalent to the existing Options.”

	 	2.	 	A new Section 12 is added after Section 11 of the Plan to read as follows:

     “Notwithstanding any other provision of the Plan to the contrary, the
following provisions shall apply to the Plan and to any Option outstanding (an

 

 

“Outstanding Option”) under the Plan immediately prior to the closing (the
“Closing”) of the exchange of the outstanding shares of the Company’s common stock
(“SA Common Stock”) for newly issued shares of the Common Stock of IsoTis, Inc.
(“Inc. Common Stock”): (i) immediately upon the Closing, IsoTis, Inc. shall assume
the Plan and all Outstanding Options, (ii) no additional Options shall be granted under the
Plan after the Closing, (iii) immediately upon the Closing, each Outstanding Option shall
be adjusted automatically to be exercisable for shares of Inc. Common Stock, with a ratio
of one (1) share of Inc. Common Stock for every ten (10) shares of SA Common Stock shares
subject to the Outstanding Option immediately prior to the Closing and with a per share
exercise price equal to ten (10) times the per share exercise price of the Outstanding
Option immediately prior to the Closing and (iv) immediately upon the Closing, all
references in the Plan to IsoTis SA and the Company are amended to refer to IsoTis, Inc., a
Delaware corporation. All references in the Plan to the share capital of IsoTis SA are
amended to refer to the share capital of IsoTis, Inc.”

	 	3.	 	This Amendment shall be and is hereby incorporated in and forms a part of the Plan.

	 	4.	 	All other terms and provisions of the Plan shall remain unchanged except as specifically
modified herein.

(Signature Page Follows)

 

 

     I hereby certify that the foregoing Amendment to the IsoTis SA Stock Option Plan 2003/1 was
duly adopted by the Board of Directors of IsoTis SA on January 24, 2007.

     Executed on this 24th day of January, 2007.

	 	 	 	 	 
	 

	 	/s/ Robert J. Morocco
	 	 
	 

	 	 

Secretary

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