Exhibit 4.3

  

   

  

  
    Unless this certificate is presented by an authorized  representative of The Depository Trust Company, a New York corporation (“DTC”), to the issuer or its agent for registration of transfer,
      exchange or payment, and any certificate issued is registered in the name of Cede & Co. or in such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is
      requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein.

    

    

    INTERNATIONAL BUSINESS MACHINES CORPORATION

    

    

    2.850% Note due 2040

    CUSIP 459200 KK6

    ISIN US459200KK67

    

    

    

    

    No.: R-

    

    

    

    

    

    

    INTERNATIONAL BUSINESS MACHINES CORPORATION, a corporation duly organized and existing under the laws of the State of New York (herein called the “Company”, which term includes any successor corporation under the Indenture referred to on the
      reverse hereof), for value received, hereby promises to pay to Cede & Co. or registered assigns, the principal sum of $                 (                 ), at the office or agency of the Company in the Borough of Manhattan, The City and State of
      New York, or any other office or agency designated by the Company for that purpose, on May 15, 2040, in such coin or currency of the United States as at the time of payment shall be legal tender for the payment of public and private debts, and to pay
      interest, semi-annually on May 15 and November 15 of each year, commencing November 15, 2020, on said principal sum at said office or agency, in like coin or currency, at the rate of 2.850% per annum, from the May 15 or November 15 next preceding the
      date of this Note to which interest has been paid, unless the date hereof is a date to which interest has been paid, in which case from the date of this Note, or unless no interest has been paid on the Notes (as defined on the reverse hereof), in
      which case from May 7, 2020, until payment of said principal sum has been made or duly provided for.  Notwithstanding the foregoing, if the date hereof is after the fifteenth calendar day preceding a May 15 or November 15, as the case may be, and
      before such May 15 or November 15, this Note shall bear interest from such May 15 or November 15; provided however, that if the Company shall default in the payment of interest due on such May 15 or November 15, then this Note shall bear interest
      from the next preceding May 15 or November 15 to which interest has been paid, or, if no interest has been paid on the Notes, from May 7, 2020.  The interest so payable on May 15 or November 15 will, subject to certain exceptions provided in the
      Indenture referred to on the reverse hereof, be paid to the person in whose name this Note is registered at the close of business on the fifteenth calendar day preceding such May 15 or November 15, unless the Company shall default in the payment of
      interest due on such interest payment date,

    

    

    
      
        


    

    

    

    

    

    in which case such defaulted interest, at the option of the Company, may be paid to the person in whose name this Note is registered at the close of business on a special record date for the payment of such defaulted interest established by notice
      to the registered holders of Notes not less than ten days preceding such special record date or may be paid in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes may be listed.  Payment of
      interest may, at the option of the Company, be made by check mailed to the registered address of the person entitled thereto.  Interest on this Note will be calculated on the basis of a 360-day year consisting of twelve 30-day months.

    

    

    Reference is made to the further provisions of this Note set forth on the reverse hereof.  Such further provisions shall for all purposes have the same effect as though fully set forth at this place.

    

    

    [signatures follow]

    

    

    
      
        


    

    

    

    

    

    This Note shall not be valid or become obligatory for any purpose until the certificate of authentication hereon shall have been signed by the Trustee under the Indenture referred to on the reverse
      hereof.

    

    

    IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its corporate seal.

     

    

    
      	Dated:

            	INTERNATIONAL BUSINESS MACHINES CORPORATION	 
	 	 	 
	 	[SEAL]

            	 
	 	 	 	 
	

            	by

            	   

            	 
	 	 	

            	 
	 	 	

            	 
	 	by

            	 	 


    

    

    

    

    
      
        


    

     

    

    TRUSTEE’S CERTIFICATE

      OF AUTHENTICATION

    

    

    This is one of the

    Securities of the Series

    designated herein issued

    under the within-

    mentioned Indenture.

     

    

    

    

    
      	THE BANK OF NEW YORK MELLON, as Trustee	 
	 	 	 
	 	 	 
	
                by 

            	   

            	 
	 	Authorized Signatory	 
	 	 	 


      

    

     

    

    
      
        


    

     

    

    This security is one of a duly authorized issue of unsecured debentures, notes or other evidences of indebtedness of the Company (hereinafter called the “Securities”), of the series hereinafter
      specified, all issued or to be issued under an indenture dated as of October 1, 1993, duly executed and delivered by the Company to The Bank of New York Mellon, a New York banking corporation, as trustee (hereinafter called the “Trustee”), as
      supplemented by the First Supplemental Indenture dated as of December 15, 1995, between the Company and the Trustee, as trustee (hereinafter called the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made
      for a description of the respective rights and duties thereunder of the Trustee, the Company and the holders of the Securities.  The Securities may be issued in one or more series, which different series may be issued in various aggregate principal
      amounts, may mature at different times, may bear interest at different rates, may have different conversion prices (if any), may be subject to different redemption provisions, may be subject to different sinking, purchase or analogous funds, may be
      subject to different covenants and Events of Default and may otherwise vary as in the Indenture provided.  This Security is one of a series designated as the 2.850% Notes due 2040 of the Company (hereinafter called the “Notes”) issued under the
      Indenture.

    

    

    The Notes may be redeemed, as a whole or in part, at the Company’s option, at any time or from time to time, upon mailing a notice of such redemption not less than 30 days nor more than 60 days prior
      to the date fixed for redemption to holders of the Notes at their last registered addresses, all as provided in the Indenture. Prior to the Par Call Date, the redemption price for the Notes will be equal to the greater of: (i) 100% of the principal
      amount of the Notes to be redeemed, plus accrued interest, if any, to the redemption date; or (ii) the sum of the present values of the Remaining Scheduled Payments, as defined below, discounted, on a semiannual basis, assuming a 360-day year
      consisting of twelve 30-day months, at the Treasury Rate, as defined below, plus 25 basis points, plus accrued interest to the date of redemption which has not been paid. On and after the Par Call Date, the redemption price for the Notes will be
      equal to 100% of the principal amount of the Notes to be redeemed, plus accrued interest, if any, to the redemption date.

    

    

    “Treasury Rate” means, with respect to any redemption date for the Notes: (i) the yield, under the heading which represents the average for the immediately preceding week, appearing in the most
      recently published statistical release designated “H.15” or any successor publication which is published weekly by the Board of Governors of the Federal Reserve System and which establishes yields on actively traded United States Treasury securities
      adjusted to constant maturity under the caption “Treasury Constant Maturities,” for the maturity corresponding to the Comparable Treasury Issue; provided that if no maturity is within three months before or after the maturity date for the Notes
      (assuming, for this purpose, that the Notes matured on the Par Call Date), yields for the two published maturities most closely corresponding to the Comparable Treasury Issue will be determined and the Treasury Rate will be interpolated or
      extrapolated from those yields on a straight line basis rounding to the nearest month; or (ii) if that release, or any successor release, is not published during the week preceding the calculation date or does not contain such yields, the rate per
      annum equal to the semiannual equivalent yield to maturity of the Comparable Treasury Issue, calculated using a price for the Comparable

    

    

    
      
        


    

    

    

    

    

    Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for that redemption date. The Treasury Rate will be calculated on the third business day preceding the redemption date.

    

    

    “Comparable Treasury Issue” means the United States Treasury security selected by an Independent Investment Banker as having a maturity comparable to the remaining term of the Notes to be redeemed
      (assuming, for this purpose, that the Notes matured on the Par Call Date) that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity
      to the remaining term of such Notes.

    

    

    “Independent Investment Banker” means one of the Reference Treasury Dealers, to be appointed by the Company.

    

    

    “Comparable Treasury Price” means, with respect to any redemption date for the Notes: (i) the average of the Reference Treasury Dealer Quotations for that redemption date, after excluding the highest
      and lowest of such Reference Treasury Dealer Quotations; or (ii) if the Company obtains fewer than four Reference Treasury Dealer Quotations, the average of all quotations obtained by the Company.

    

    

    “Par Call Date” means November 15, 2039 (six months prior to the maturity date of the Notes).

    

    

    “Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any redemption date, the average, as determined by the Company, of the bid and asked prices for the
      Comparable Treasury Issue, expressed in each case as a percentage of its principal amount, quoted in writing to the Company by such Reference Treasury Dealer at 3:30 p.m., New York City time on the third business day preceding such redemption date.

    

    

    “Reference Treasury Dealer” means each of BofA Securities, Inc., Citigroup Global Markets Inc., Credit Suisse Securities (USA) LLC, Deutsche Bank Securities Inc., Goldman Sachs & Co. LLC,
      Santander Investment Securities Inc., SG Americas Securities, LLC and Wells Fargo Securities, LLC, or a Primary Treasury Dealer selected by any of them, and their respective successors; provided however, that if
      any of the foregoing shall cease to be a primary U.S. Government securities dealer (a “Primary Treasury Dealer”) the Company will substitute therefor another nationally recognized investment banking firm that is a Primary Treasury Dealer.

    

    

    “Remaining Scheduled Payments” means, with respect to each Note to be redeemed, the remaining scheduled payments of the principal thereof and interest thereon that would be due after the related
      redemption date but for such redemption (assuming, for this purpose, that the Notes matured on the Par Call Date); provided however, that, if such redemption date is not an interest payment date with respect to such Note, the amount of the next
      succeeding scheduled interest payment thereon will be deemed to be reduced by the amount of interest accrued thereon to such redemption date.

    

    

    
      
        


    

    

    

    

    

    On and after the redemption date, interest will cease to accrue on the Notes or any portion thereof called for redemption, unless the Company defaults in the payment of the redemption price and
      accrued interest. On or before the redemption date, the Company will deposit with a Paying Agent, or the Trustee, money sufficient to pay the redemption price of and accrued interest on the Notes to be redeemed on such date. If less than all of the
      Notes are to be redeemed, the Notes to be redeemed shall be selected by the Trustee by such method as the Trustee shall deem fair and appropriate.

    

    

    In case an Event of Default with respect to the Notes, as defined in the Indenture, shall have occurred and be continuing, the principal hereof together with interest accrued thereon, if any, may be
      declared, and upon such declaration shall become, due and payable, in the manner, with the effect and subject to the conditions provided in the Indenture.

    

    

    The Indenture contains provisions permitting the Company and the Trustee, with the consent of the holders of not less than a majority in aggregate principal amount of the Securities at the time
      outstanding of all series to be affected (acting as one class), to execute supplemental indentures adding any provisions to or changing in any manner or eliminating any of the provisions of the Indenture or of any supplemental indenture or modifying
      in any manner the rights of the holders of the Securities of such series to be affected; provided however, that no such supplemental indenture shall, among other things, (i) change the fixed maturity of the principal of, or any installment of
      principal of or interest on, or the currency of payment of, any Security; (ii) reduce the principal amount thereof or the rate of interest thereon or any premium payable upon the redemption thereof; (iii) impair the right to institute suit for the
      enforcement of any such payment on or after the fixed maturity thereof (or, in the case of redemption, on or after the redemption date); (iv) reduce the percentage in principal amount of the outstanding Securities of any series, the consent of whose
      holders is required for any such supplemental indenture, or the consent of whose holders is required for any waiver (of compliance with certain provisions of the Indenture or certain defaults thereunder and their consequences) provided for in the
      Indenture; (v) change any obligation of the Company, with respect to outstanding Securities of a series, to maintain an office or agency in the places and for the purposes specified in the Indenture for such series; or (vi) modify any of the
      foregoing provisions or the provisions for the waiver of certain covenants and defaults, except to increase any applicable percentage of the aggregate principal amount of outstanding Securities the consent of the holders of which is required or to
      provide with respect to any particular series the right to condition the effectiveness of any supplemental indenture as to that series on the consent of the holders of a specified percentage of the aggregate principal amount of outstanding Securities
      of such series or to provide that certain other provisions of the Indenture cannot be modified or waived without the consent of the holder of each outstanding Security affected thereby.  It is also provided in the Indenture that the holders of a
      majority in aggregate principal amount of the Securities of a series at the time outstanding may on behalf of the holders of all the Securities of such series waive any past default under the Indenture with respect to such series and its
      consequences, except a default in the payment of the principal of, premium, if any, or interest, if any, on any Security of such series or in respect of a covenant or provision which cannot be modified without the consent of the Holder of each

    

    

    
      
        


    

    

    

    

    

    outstanding Security of the series affected.  Any such consent or waiver by the holder of this Note shall be conclusive and binding upon such holder and upon all future holders and owners of this Note and any Notes which may be issued in exchange
      or substitution herefor, irrespective of whether or not any notation thereof is made upon this Note or such other Notes.

    

    

    No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal
      of, premium, if any, and interest on this Note at the place, at the respective times, at the rate and in the coin or currency herein prescribed.

    

    

    The Indenture permits the Company to Discharge its obligations with respect to the Notes on the 91st day following the satisfaction of the conditions set forth in the Indenture, which include the
      deposit with the Trustee of money or U.S. Government Obligations or a combination thereof sufficient to pay and discharge each installment of principal of (including premium, if any, on) and interest, if any, on the outstanding Notes.

    

    

    If the Company shall, in accordance with Section 901 of the Indenture, consolidate with or merge into any other corporation or convey or transfer its properties and assets substantially as an
      entirety to any Person, the successor shall succeed to, and be substituted for, the Person named as the “Company” on the face of this Note, all on the terms set forth in the Indenture.

    

    

    The Notes are issuable in registered form without coupons in denominations of $100,000 and any integral multiple of $1,000 in excess thereof.  In the manner and subject to the limitations provided in
      the Indenture, but without the payment of any service charge, Notes may be exchanged for an equal aggregate principal amount of Notes of other authorized denominations at the office or agency of the Company maintained for such purpose in the Borough
      of Manhattan, The City and State of New York.

    

    

    Upon due presentation for registration of transfer of this Note at the office or agency of the Company for such registration in the Borough of Manhattan, The City and State of New York, or any other
      office or agency designated by the Company for such purpose, a new Note or Notes of authorized denominations for an equal aggregate principal amount will be issued to the transferee in exchange herefor, subject to the limitations provided in the
      Indenture, without charge except for any tax or other governmental charge imposed in connection therewith.

    

    

    Prior to due presentment for registration of transfer of this Note, the Company, the Trustee and any agent of the Company or the Trustee may deem and treat the registered holder hereof as the
      absolute owner of this Note (whether or not this Note shall be overdue) for the purpose of receiving payment of the principal of, premium, if any, and interest on this Note, as herein provided, and for all other purposes, and neither the Company nor
      the Trustee nor any agent of the Company or the Trustee shall be affected by any notice of the contrary.  All payments made to or upon the order of such registered

    

    

    
      
        


    

    

    

    

    

    holder shall, to the extent of the sum or sums paid, effectually satisfy and discharge liability for moneys payable on this Note.

    

    

    No recourse for the payment of the principal of, premium, if any, or interest on this Note, or for any claim based hereon or otherwise in respect hereof, and no recourse under or upon any obligation,
      covenant or agreement of the Company in the Indenture or any indenture supplemental thereto or in any Note, or because of the creation of any indebtedness represented thereby, shall be had against any incorporator, stockholder, officer or director,
      as such, past, present or future, of the Company or of any successor corporation, either directly or through the Company or any successor corporation, whether by virtue of any constitution, statute or rule of law or by the enforcement of any
      assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issue hereof, expressly waived and released.

    

    

    Unless otherwise defined in this Note, all terms used in this Note which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

    

    

    THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.