Exhibit 4.2

  

   

    EXECUTION VERSION

  

  

  

  
    ASSIGNMENT, ASSUMPTION AND AMENDMENT AGREEMENT

     

    This Assignment, Assumption and Amendment Agreement (this “Agreement”) is
      made and entered into as of November 20, 2019, by and among Celgene Corporation, a Delaware corporation (“Assignor”), Bristol-Myers Squibb Company, a Delaware corporation (“Assignee”), American Stock Transfer & Trust Company, LLC, a New York limited liability company, as trustee (the “Existing Trustee”), and Equiniti Trust Company, a limited trust organized under the laws of the State of New York (the “New Trustee”).  All
      capitalized terms used but not defined in this Agreement have the meanings given to them in the CVR Agreement (as defined below).

     

    WHEREAS, Assignor and the Existing Trustee entered into a Contingent Value Rights Agreement, dated as of October 15, 2010 (as amended, supplemented or
      otherwise modified from time to time in accordance with its terms, the “CVR Agreement”);

     

    WHEREAS, Assignor, Assignee and Burgundy Merger Sub, Inc., a Delaware corporation and a direct wholly-owned subsidiary of Assignee (“Merger Sub”), are parties to that certain Agreement and Plan of Merger, dated as of January 2, 2019 (as amended, supplemented or otherwise modified from time to time in
      accordance with its terms, the “Merger Agreement”), pursuant to which, among other things, Merger Sub merged with and into Assignor at the Merger Effective Time (as defined
      in the Merger Agreement), with Assignor continuing as the surviving corporation and a direct wholly-owned subsidiary of Assignee (the “Merger”);

     

    WHEREAS, substantially contemporaneously with the execution and delivery of this Agreement, Assignee has, in accordance with Section 1.2 and Section
      9.3 of the CVR Agreement, delivered an Officer’s Certificate and Opinion of Counsel to the Trustee, as conclusive evidence that the matters contemplated by Section 1 or Section 2 below, respectively, comply with the applicable provisions of the CVR
      Agreement and that there has been compliance with all conditions precedent provided for or relating to the foregoing under the CVR Agreement;

     

    WHEREAS, pursuant to Section 6.1 of the CVR Agreement, the Company and the Trustee may, without the consent of the Holders, enter into one or more
      amendments to the CVR Agreement to, among other things, make any change that does not adversely affect the interests of the Holders or to evidence the succession of another Person to the Company and the assumption by any such successor of the
      covenants of the Company herein and in the Securities;

     

    WHEREAS, in connection with the Merger, (a) Assignor and the Existing Trustee desire to amend the CVR Agreement to clarify that the calculation of the
      combined capital and surplus of the Trustee shall include the Trustee and its affiliates; (b) Assignor and the Existing Trustee desire to amend the CVR Agreement to allow for the Securities to be listed on the New York Stock Exchange or any other
      national securities exchange following the Merger Effective Time; (c) Assignor and the Existing Trustee desire to amend the CVR Agreement to allow for Assignee, the parent company of Assignor following the Merger, to assume all of its rights, duties,
      obligations, liabilities and interests in, to and under the CVR Agreement; and (d) the parties desire to execute and deliver this Agreement as evidence of the agreement and consent of such assignment and assumption to Assignee;

     

    

    
      
        


    

    
    WHEREAS, following the consummation of the Merger, Assignor desires to assign all of its rights, duties, obligations, liabilities and interests in, to
      and under the CVR Agreement to Assignee, and Assignee desires to assume all such rights, duties, obligations, liabilities and interests of Assignor in, to and under the CVR Agreement, which assignment shall be effective immediately following the
      listing of the Securities on the New York Stock Exchange;

     

    WHEREAS, Section 4.10(b) of the CVR Agreement provides that the Trustee may at any time resign by giving written notice to the Assignor, effective
      upon the appointment of a successor trustee pursuant to Section 4.11 of the CVR Agreement; and

     

    WHEREAS, immediately following the Merger Effective Time, the Existing Trustee desires to resign as trustee of the CVR Agreement, the Company desires
      to appoint the New Trustee as successor trustee of the CVR Agreement, and the New Trustee is willing to accept such appointment as successor trustee under the CVR Agreement.

     

    NOW, THEREFORE, in consideration of the mutual promises, covenants and agreements and other good and valuable consideration, the parties, each
      intending to be legally bound, hereby agree as follows:

     

    1. Amendment to Section 4.9, 7.7 and 9.4 of the CVR Agreement and Related Agreements.

     

    
      
        	

              	a)	
                On the date hereof, effective immediately following the Merger Effective Time, the Assignor and the Existing Trustee hereby agree to amend and restate the first sentence of
                  Section 4.9 of the CVR Agreement as follows:

              


      

    

     

    “There shall at all times be a Trustee hereunder which satisfies the applicable requirements of Sections 310(a)(1) and (5) of the Trust Indenture Act
      and which, along with its Affiliates, has a combined capital and surplus of at least one hundred fifty million dollars ($150,000,000).”

     

    
      
        	

              	b)	
                On the date hereof, effective immediately following the Merger Effective Time, the Assignor and the Existing Trustee hereby agree to amend and restate Section 7.7 of the CVR
                  Agreement in its entirety as follows:

              


      

    

     

    “The Company hereby covenants and agrees to use reasonable best efforts to cause the Securities to be approved for listing (subject to notice of
      issuance) for trading on the New York Stock Exchange or other national securities exchange and will use its reasonable best efforts to maintain such listing for so long as any CVRs remain Outstanding.”

     

    
      
        	

              	c)	
                Without limiting the generality of Section 1(b) above, each party hereto acknowledges and agrees that Assignee, subject to, and conditioned upon, the occurrence of the Merger
                  Effective Time, intends to delist the CVRs from the Nasdaq and list the CVRs on the New York Stock Exchange and consents to the same.

              


      

    

     

    
      
        	

              	d)	
                On the date hereof, effective immediately following the Merger Effective Time, the Assignor and the Existing Trustee hereby agree to amend and restate Section 9.4 of the CVR
                  Agreement in its entirety as follows:

              


         

        

      

    

    
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    “All covenants, provisions and agreements in this CVR Agreement by or for the benefit of the Company, the Trustee or the Holders shall bind and inure
      to the benefit of their respective successors, assigns, heirs and personal representatives, whether so expressed or not. The Company may assign this CVR Agreement without the prior written consent of the other Parties to this CVR Agreement to one or
      more of its Affiliates, provided, however, that in the event of any such assignment the Company shall, unless and to the extent performed by any such assignee, remain subject to its obligations and covenants hereunder, including but not limited to
      its obligation to make any Net Sales Payments and any Milestone Payments.”

     

    2. Assignment and Assumption.

     

    
      
        	

              	a)	
                Subject to, and conditioned upon the occurrence of the Merger Effective Time, and effective as of immediately following the listing of the Securities on the New York Stock
                  Exchange, Assignor hereby assigns all of its rights, duties, obligations, liabilities and interests in, to and under the CVR Agreement to Assignee, and Assignee hereby assumes all such rights, duties, obligations, liabilities and
                  interests of Assignor in, to and under the CVR Agreement, including, without limitation, the due and punctual payment of the Securities, according to their tenor, and the due and punctual performance and observance of all of the covenants
                  and conditions of the CVR Agreement to be performed or observed by Assignor (collectively, the “Assignment and Assumption”).

              


      

    

     

    
      
        	

              	b)	
                Each of the parties hereto acknowledges, agrees and consents to, subject to and conditioned upon the Assignment and Assumption, Assignor succeeding to and being substituted for
                  Assignee with the same effect as if Assignor had been named in the CVR Agreement as the “Company” for all purposes under the CVR Agreement.  Without limiting the generality of the foregoing, (i) each of the parties, for the avoidance of
                  doubt, acknowledges and agrees that Assignee shall succeed to and be substituted for Assignor automatically, without any further action of any party hereto, at the Merger Effective Time, (ii) the Existing Trustee (prior to the appointment
                  and acceptance of the New Trustee as trustee under the CVR Agreement pursuant to Section 3) and the New Trustee (from and after the appointment and acceptance of the New Trustee as trustee pursuant to Section 3) agree to take any of the
                  foregoing actions as if an assumption occurred pursuant to Section 9.1(i) and the other relevant provisions of the CVR Agreement in connection with the matters described by this Section 2 and (iii) the CVR Agreement shall automatically be
                  deemed to be modified accordingly to give effect to the matters described by this Section 2.

              


      

    

     

    3. Resignation of Existing Trustee; Appointment of New Trustee.

     

    
      
        	

              	a)	
                Subject to, and conditioned upon, and effective as of immediately following, the Merger Effective Time, pursuant to Section 4.10(b) of the CVR Agreement, the Existing Trustee
                  hereby notifies the Assignor that the Existing Trustee is resigning as trustee under the CVR Agreement.

              


      

    

     

    
      
        	

              	b)	
                Subject to, and conditioned upon, and effective as of immediately following, the Merger Effective Time, (i) the Assignor hereby accepts the resignation of the Existing Trustee as
                  trustee under the CVR Agreement and (ii) pursuant to Section 4.10(e) of the CVR Agreement, the Assignor hereby appoints the New Trustee as trustee under the CVR Agreement, to succeed to, and hereby vests the New Trustee with, all the
                  estates, properties, rights powers, trusts, duties and obligations of the Trustee under the CVR Agreement with like effect as if originally named as trustee in the CVR Agreement.

              


         

        

      

    

    
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              	c)	
                The New Trustee hereby accepts the appointment as trustee under the CVR Agreement and shall hereby be vested with all the estates, properties, rights powers, trusts, duties and
                  obligations of the Trustee under the CVR Agreement with like effect as if originally named as trustee in the CVR Agreement.  The New Trustee hereby represents and warrants that it is qualified and eligible under Article 4 of the CVR
                  Agreement to act as trustee under the CVR Agreement.

              


      

    

     

    
      
        	

              	d)	
                From and after giving effect to the appointment and acceptance of the New Trustee as trustee under the CVR Agreement until otherwise amended, modified or supplemented in
                  accordance with the CVR Agreement, references in the CVR Agreement to “Corporate Trust Office” or other similar terms shall be deemed to refer to the corporate trust office of the New Trustee at 1110 Centre Pointe Curve, Suite 101 Mendota
                  Heights, Minnesota 55120-4101 or any other office of the New Trustee at which, at any particular time, its corporate trust business shall be administered.

              


      

    

     

    4. Successors and Assigns. This Agreement shall be binding upon and shall inure to the
      benefit of the respective parties hereto and their respective successors and assigns.

     

    5. Governing Law. This Agreement shall be governed by and construed in accordance with the
      laws of the State of New York including, without limitation, Sections 5-1401 and 5-1402 of the New York General Obligations Law without regard to the conflict of laws principles thereof.

     

    6. No Further Amendment to CVR Agreement. Except as specifically modified or amended by
      this Agreement, the CVR Agreement shall remain unaltered and in full force and effect and the respective terms, conditions and covenants thereof are herein in all respects confirmed.  Whenever the CVR Agreement is referred to in any agreement,
      document or other instrument, such reference will be to the CVR Agreement as modified and/or amended by this Agreement.

     

    7. Amendment. This Agreement may not be changed, modified, discharged or terminated orally
      or in any manner other than by an agreement in writing signed by the parties hereto or their respective successors and assigns specifically identifying such writing as an amendment to this Agreement.

     

    8. Severability. In case any provision in this Agreement are held to be invalid, illegal or
      unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

     

    9. Counterparts. This Agreement may be signed in any number of counterparts with the same
      effect as if the signatures to each counterpart were upon a single instrument, and all such counterparts together will be deemed an original of this Agreement.

     

    [Signature Page Follows]

     

    

    
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    IN WITNESS WHEREOF, each of the undersigned has executed this Assignment and Assumption Agreement as of the date first written above.

    

    

    	 	
            ASSIGNOR:

          
	 	 
	 	
            CELGENE CORPORATION

          
	 	 	 
	 	
            By:

          	
            
              /s/ Katherine R. Kelly

            

          
	 	
            Name:

          	
            Katherine R. Kelly

          
	 	
            Title:

          	
            Secretary

          


    

    

    	 	
            ASSIGNEE:

          
	 	 
	 	
            BRISTOL-MYERS SQUIBB COMPANY

          
	 	 	 
	 	
            By:

          	
            
              /s/ Katherine R. Kelly

            

          
	 	
            Name:

          	
            Katherine R. Kelly

          
	 	
            Title:

          	
            Secretary

          


    

    

    	 	
            EXISTING TRUSTEE:

          
	 	 
	 	
            AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC

          
	 	 	 
	 	
            By:

          	
            
              /s/ Michael Nespoli

            

          
	 	
            Name:

          	
            Michael Nespoli

          
	 	
            Title:

          	
            Executive Director

          


    

    

    
      [Signature Page to Assignment and Assumption Agreement]

      

    

    
      
        


    

    	 	
            NEW TRUSTEE:

          
	 	 
	 	
            EQUINITI TRUST COMPANY

          
	 	 	 
	 	
            By:

          	
            
              /s/ Martin Knapp

            

          
	 	
            Name:

          	
            Martin Knapp

          
	 	
            Title:

          	
            Vice President

          


     

    

     
      [Signature Page to Assignment and Assumption Agreement]