HOLLYFRONTIER CORPORATION AS ISSUER and WELLS FARGO BANK, NATIONAL ASSOCIATION AS TRUSTEE _____________________ FIRST SUPPLEMENTAL INDENTURE Dated as of March 22, 2016 to Indenture dated as of March 22, 2016 _____________________ 5.875% Senior Notes due 2026

THIS FIRST SUPPLEMENTAL INDENTURE, dated as of March 22, 2016 (this “First Supplemental Indenture”), is between HollyFrontier Corporation, a Delaware corporation (the “Company”), and Wells Fargo Bank, National Association, a national banking association, as trustee (the “Trustee”).

WHEREAS, the Company has executed and delivered to the Trustee an Indenture, dated as of March 22, 2016 (the “Base Indenture”), providing for the issuance by the Company from time to time of its debentures, notes, or other evidences of indebtedness, in one or more series unlimited as to principal amount (the “Securities”); and

WHEREAS, the Base Indenture, as amended and supplemented from time to time, including without limitation pursuant to this First Supplemental Indenture, shall be referred to herein as the “Indenture”; and

WHEREAS, the Company has duly authorized and desires to cause to be issued pursuant to the Indenture, a series of Securities (collectively, the “Notes”), designated as set forth in this First Supplemental Indenture; and

WHEREAS, the Company desires to cause the issuance of the Notes pursuant to Sections 3.01 and 3.03 of the Base Indenture, which sections permit the execution of indentures supplemental thereto to establish the form and terms of Securities of any series; and

WHEREAS, the Company has requested that the Trustee join in the execution of this First Supplemental Indenture to establish the form and terms of the Notes; and

WHEREAS, all things necessary have been done to make the Notes, when issued and executed by the Company and authenticated and delivered under the Indenture, the valid obligations of the Company, and to make this First Supplemental Indenture a valid agreement of the Company, enforceable in accordance with the terms hereof;

NOW, THEREFORE, the Company and the Trustee hereby agree that the following provisions shall amend and supplement the Base Indenture, but only in relation to the Notes:

SECTION 1.1    Form.

The Notes and the related Trustee’s certificate of authentication shall be substantially in the respective forms thereof set forth in Exhibit A to this First Supplemental Indenture, with such appropriate insertions, omissions, substitutions and other variations as are required or permitted by the Indenture, and may have such letters, numbers or other marks of identification and such legends or endorsements placed thereon as the Company may deem appropriate or as may be required or appropriate to comply with any laws or with any rules made pursuant thereto or with the rules of any securities exchange or automated quotation system on which the Notes may be listed or traded,

or to conform to general usage, or as may, consistently with the Indenture, be determined by the officers executing such Notes, as evidenced by their execution thereof.

Exhibit A is hereby incorporated into this First Supplemental Indenture. The terms and provisions contained in the Notes shall constitute, and are hereby expressly made, a part of this First Supplemental Indenture, and to the extent applicable, the Company and the Trustee, by their execution and delivery of this First Supplemental Indenture, expressly agree to such terms and provisions and to be bound thereby.

The Notes shall be issued only as Registered Securities, and may not be exchanged for Bearer Securities. The Notes shall be issued upon original issuance in whole in the form of one or more global Securities (the “Book-Entry Notes”). Each Book-Entry Note shall represent such aggregate principal amount of the Outstanding Notes as shall be specified therein and shall provide that it shall represent the aggregate principal amount of Outstanding Notes from time to time endorsed thereon and that the aggregate principal amount of Outstanding Notes represented thereby may from time to time be reduced or increased, as appropriate, to reflect exchanges and redemptions. Any endorsement of a Book-Entry Note to reflect the aggregate principal amount, or any increase or decrease in the aggregate principal amount, of Outstanding Notes represented thereby shall be made by the Trustee in accordance with written instructions, or such other form of instructions as is customary for the Depository, from the Depository or its nominee on behalf of any Person having a beneficial interest in the Book-Entry Note. The Company initially appoints The Depository Trust Company to act as Depository with respect to the Book-Entry Notes.

SECTION 1.2    Title, Amount, Stated Maturity and Interest.

There is hereby established a new series of Securities to be issued under the Indenture, that is designated as the “5.875% Senior Notes due 2026.”

The Trustee shall initially authenticate and deliver for original issue 5.875% Senior Notes due 2026 in an initial aggregate principal amount of $250,000,000 upon delivery to the Trustee of a Company Order for the authentication and delivery of such Notes.

Notes may be issued on any Business Day on or after March 22, 2016. The aggregate principal amount of the Notes that may be authenticated and delivered pursuant to the Indenture is unlimited. The aggregate principal amount of the Notes to be issued under the Indenture may be increased at any time, and the Notes may be reopened for issuances of additional Notes, upon a Company Order, without the consent of any Holder and without any further supplement or amendment to the Indenture; provided that if such additional Notes are not fungible with the Notes issued on the date of this First Supplemental Indenture for U.S. federal income tax purposes, such additional Notes shall have a separate CUSIP number. Each such Company Order for the issuance of additional Notes shall specify the principal amount of the Notes to be authenticated, the date on which the additional Notes are to be authenticated, and the name or names of the initial Holder or Holders thereof. The Notes issued on the date of this First Supplemental Indenture and any additional Notes that may be issued after such date shall be part of the same series of Securities for all purposes under the Indenture.

The Stated Maturity of the Notes shall be April 1, 2026.

The rate at which the Notes shall bear interest, the date from which such interest shall accrue, the dates on which interest shall be payable and the Regular Record Date for interest payable on any Interest Payment Date, in each case, shall be as set forth in the form of the Notes attached as Exhibit A to this First Supplemental Indenture. All payments of principal of, premium, if any, and interest due on any Notes represented by Book-Entry Notes on any Interest Payment Date or at Maturity, will be made available to the Trustee by 11:00 a.m., New York City time, on such date, unless such date falls on a day that is not a Business Day, in which case such payments will be made available to the Trustee by 11:00 a.m., New York City time, on the next Business Day. As soon as practicable thereafter, the Trustee will make such payments to the Depository.

SECTION 1.3    Security Registrar and Paying Agent.

The Company initially appoints the Trustee as Security Registrar and Paying Agent with respect to the Notes. The office or agency where Notes may be presented for registration of transfer or exchange and the Place of Payment for the Notes shall initially be the Corporate Trust Office of the Trustee.

SECTION 1.4    Transfer and Exchange.

With respect to the Notes, the transfer and exchange of Book-Entry Notes or beneficial interests therein shall be effected through the Depository, in accordance with Section 3.05 of the Base Indenture and the rules and procedures of the Depository therefor.

SECTION 1.5    Discharge.

The Indenture shall be subject to satisfaction and discharge as contemplated by Article Four of the Base Indenture.

SECTION 2.1    Amendments to Certain Covenants.

With respect to the Notes, Sections 11.01 and 11.02 of Article Eleven of the Base Indenture are hereby amended to read as follows.

Nothing in the Indenture or in the Notes shall in any way restrict or prevent the Company or any Subsidiary from incurring any indebtedness; provided that the Company covenants and agrees that, so long as any Notes are Outstanding, neither it nor any Principal Domestic Subsidiary will create or assume any Liens upon any Principal Property or of or upon any capital stock of any Principal Domestic Subsidiary, whether now owned or hereafter acquired (all property and assets, tangible or intangible, real, personal or mixed, of whatsoever kind or description, being referred to herein as “property”) to secure any indebtedness for money borrowed, without effectively providing

for the Notes and any other series of Securities then Outstanding or thereafter created (together with, if the Company so determines, any other indebtedness or obligation then existing and any other indebtedness or obligation thereafter created ranking equally with the Notes) to be secured equally and ratably with (or prior to) such indebtedness for so long as such indebtedness shall be secured, except that the foregoing provision shall not apply to the following Liens (“Permitted Liens”):

(1)    Any Lien created by the Company or a Subsidiary to secure all or part of the purchase price of any property (or to refund or refinance all or part of such purchase price within 24 months of the acquisition of such property) or to secure a loan made to enable the Company or a Subsidiary to acquire the property described in such Lien; provided, however, that %6) such Lien shall not encumber any other property of the Company or a Subsidiary (other than property constituting substitutions or replacements for, or accessions to, property which is encumbered pursuant to after-acquired property provisions of the agreements in accordance with which such Liens were granted) and %6) the principal amount of the indebtedness secured by any such Lien, together with all other indebtedness secured by a Lien on such property, shall not exceed the purchase price of such property;

(2)    Any Lien existing on any property at the time of the acquisition thereof by the Company or a Subsidiary whether or not assumed by the Company or a Subsidiary, any Lien on any property acquired or constructed by the Company or a Subsidiary and created not later than 24 months after (a) such acquisition or completion of such construction or (b) commencement of full operation of such property, whichever is later, and any Lien on any property with respect to which the Company or a Subsidiary has made additions, substantial repairs, alterations or improvements and created not later than 24 months after completion of such additions, repairs, alterations or improvements; provided, however, that (A) the principal amount of the indebtedness secured by such Lien, together with all other indebtedness secured by a Lien on such property, shall not exceed the purchase price of the property acquired, the cost of the property constructed and/or the costs of such additions, repairs, alterations or improvements and (B) such Lien does not extend to or cover any property other than such property acquired, constructed, repaired, altered and/or improved (other than property constituting substitutions or replacements for, or accessions to, property which is encumbered pursuant to after-acquired property provisions of the agreements in accordance with which such Liens were granted);

(3)    Any Lien created or assumed by the Company or a Subsidiary on any contract for the sale of any product or service or any rights thereunder or any proceeds therefrom, including accounts and other receivables, related to the operation or use of any property acquired or constructed by the Company or a Subsidiary and created not later than 12 months after (a) such acquisition or completion of such construction or (b) commencement of full operation of such property, whichever is later;

(4)    Any Lien existing on any property or stock or other equity interests of an entity at the time it is acquired by the Company or any of its Subsidiaries, whether through merger, consolidation, purchase of assets or otherwise; provided, however, that such Lien does not extend to any other property of the Company or any of its Subsidiaries (other than property constituting substitutions or replacements for, or accessions to, property which is encumbered pursuant to after-acquired property provisions of the agreements in accordance with which such Liens were granted);

(5)    Any mechanic’s or materialmen’s Liens or any Lien arising by reason of pledges or deposits to secure payment of workmen’s compensation or other insurance, good faith deposits in connection with tenders or leases of real estate, bids or contracts, deposits to secure public or statutory obligations, deposits to secure or in lieu of surety, stay or appeal bonds and deposits as security for the payment of taxes or assessments or other similar charges, and Liens arising in connection with statutory or contractual set-off provisions granted or arising in the ordinary course of business;

(6)    Any Lien arising by reason of deposits with or the giving of any form of security to any governmental agency or any body created or approved by law or governmental regulation for any purpose at any time as required by law or governmental regulation as a condition to the transaction of any business or the exercise of any privilege or license, or to enable the Company or a Subsidiary to maintain self-insurance or to participate in any fund for liability on any insurance risks or in connection with workmen’s compensation, unemployment insurance, old age pensions or other social security or to share in the privileges or benefits required for companies participating in such arrangements;

(7)    Liens for taxes, assessments and governmental charges which are not at the time delinquent or which are being contested in good faith by appropriate proceedings by the Company or a Subsidiary;

(8)    Liens due to zoning, planning and environmental laws and ordinances and governmental regulations; minor defects or irregularities in or encumbrances on the titles to properties which in the aggregate do not materially impair the use of the property of the Company and its Subsidiaries, taken as a whole, for the purposes for which it is held in the operation of the business of the Company and its Subsidiaries; easements, exceptions or reservations in any property of the Company or a Subsidiary granted or reserved for the purpose of pipelines, roads, telecommunication equipment and cable, streets, alleys, highways, railroad purposes, the removal of oil, gas, coal or other minerals or timber, and other like purposes, or for the joint or common use of real property, facilities and equipment, which do not materially impair the use of the property of the Company and its Subsidiaries, taken as a whole, for the purposes for which it is held in the operation of the business of the Company and its Subsidiaries, or materially detract from the value of the property subject thereto;

(9)    Liens securing any obligation incurred in connection with the rendering of a final judgment or award the execution of which has been stayed or which has been appealed and secured, if necessary, by the filing of an appeal bond and the claims secured thereby are being contested in good faith by appropriate proceedings;

(10)    Liens on property of any Subsidiary to secure obligations of such Subsidiary to the Company or to another Subsidiary; provided, however, that the obligations secured by such Liens may not be assigned, sold or otherwise transferred to a Person other than the Company or a Subsidiary unless such Lien would otherwise be permitted to be granted to such Person under another exception in this Section;

(11)    Liens on current assets of the Company or any Subsidiary created to secure indebtedness and letter of credit reimbursement obligations incurred in connection with the extension of working capital financing;

(12)    Any Lien on any property of the Company or any Subsidiary existing at the date of the Indenture (or property constituting substitutions or replacements for, or accessions to, property which is encumbered pursuant to after-acquired property provisions of the agreements in accordance with which such Liens were granted);

(13)    Liens (which may include customary after-acquired property provisions relating to substitutions or replacements for, or accessions to, the property encumbered thereby) incurred in connection with the borrowing of funds if, within 120 days following the date of such borrowing, such funds are utilized to repay indebtedness in the same (or greater) principal amount secured by other Liens (other than Liens referred to in clause (11) above) on property of the Company or any Subsidiary having a fair market value (as determined in good faith by the chief financial officer of the Company) at least equal to the fair market value of the property which secures the new Lien;

(14)    Liens securing industrial development, pollution control or other revenue bonds issued or guaranteed by the United States of America, or any State, or any department, agency, instrumentality or political subdivision of either; and

(15)    Any renewal, refunding or extension of maturity, in whole or in part, of any Lien created or assumed in accordance with the provisions of subdivision (1),(2),(3),(4),(10),(11), or (12) above; provided, however, that the principal amount of the indebtedness secured by such renewal Lien, refunding Lien or extended Lien shall not exceed the principal amount of the indebtedness, plus any prepayment premium or accrued interest, secured by the Lien to be renewed, refunded or extended outstanding at the time of such renewal, refunding or extension, plus any premium or fee payable in connection with any such renewal, refunding or extension; provided, further, that in the case of any revolving credit or similar facility which allows the Company or any Subsidiary to borrow any money thereunder immediately prior to the time of such renewal, refunding or extension of maturity, the principal amount of indebtedness secured by the renewal Lien, refunding Lien or extended Lien shall not exceed the maximum stated amount which could be borrowed under such facility immediately prior to such renewal, refunding or extension (without regard to any borrowing base, collateral value, debt to equity, debt service or other provisions then purporting to limit any borrowings thereunder); and in any case the lien of such renewal Lien, refunding Lien or extended Lien shall be limited to the same property (or property constituting substitutions or replacements for, or accessions to, property which is encumbered pursuant to after-acquired property provisions of the agreements in accordance with which such Liens were granted) that secured the Lien so renewed, refunded or extended.

Notwithstanding the preceding provisions of this Section 11.01, the Company and any of its Principal Domestic Subsidiaries may create or assume any Lien upon any Principal Property or capital stock of any of the Company’s Principal Domestic Subsidiaries to secure any indebtedness for money borrowed (other than Securities issued under the Indenture), which Lien is not already excepted from this Section 11.01 as a Permitted Lien, without securing the Notes or any other series of Securities then Outstanding, provided that the aggregate principal amount of all such indebtedness then outstanding secured by such Lien and all other similar Liens other than Permitted Liens, together with all Attributable Indebtedness then outstanding from Sale and Leaseback Transactions, excluding Sale and Leaseback Transactions permitted by clauses (1) and

(2) of the first paragraph of Section 11.02 below or clause (a) of the second paragraph thereof, does not exceed 15% of the Consolidated Adjusted Net Assets of the Company and its Subsidiaries.

The Company covenants and agrees that, for so long as any Notes are Outstanding, neither it nor any Principal Domestic Subsidiary will enter into any arrangement with any Person, or to which any such Person is a party, providing for the leasing to the Company or a Principal Domestic Subsidiary for a period of more than three years of Principal Property which has been or is to be sold or transferred by the Company or such Principal Domestic Subsidiary to such Person or to any other Person, and with respect to which the funds have been or are to be advanced by such Person on the security of the leased Principal Property (in this Article Eleven called a “Sale and Leaseback Transaction”) unless either:

(1)    the Company or such Principal Domestic Subsidiary would be entitled, pursuant to Section 11.01 above, to incur indebtedness secured by a Lien on the Principal Property to be leased, without equally and ratably securing the Notes and any other series of Securities then Outstanding, or

(2)    the Company, within 12 months after the effective date of such Sale and Leaseback Transaction (whether made by the Company or a Principal Domestic Subsidiary) applies an amount equal to the Attributable Indebtedness from such Sale and Leaseback Transaction (i) to the indirect or direct acquisition, construction, improvement or expansion of other property that will constitute Principal Property, including through the acquisition of a Principal Domestic Subsidiary or (ii) to the voluntary retirement of Funded Debt; provided, however, that the amount to be applied to the retirement of Funded Debt shall be reduced by (A) the principal amount of Securities delivered, within 12 months after the effective date of such Sale and Leaseback Transaction, to the Trustee for retirement and cancellation and (B) the principal amount of other Funded Debt voluntarily retired by the Company within such 12-month period, excluding retirements of Securities and other Funded Debt pursuant to mandatory sinking fund or prepayment provisions or by payment at maturity.

Notwithstanding the preceding provisions of this Section 11.02, the Company and any Principal Domestic Subsidiary may enter into any Sale and Leaseback Transaction that is not excepted above (a) with any of HLS, HEP or any of their respective subsidiaries without any limitation, or (b) provided that the Attributable Indebtedness from such Sale and Leaseback Transaction, together with the aggregate principal amount of then outstanding indebtedness (other than Securities issued under the Indenture) secured by Liens (other than Permitted Liens) upon Principal Properties, does not exceed 15% of the Consolidated Adjusted Net Assets of the Company and its Subsidiaries.

SECTION 3.1    Optional Redemption.

(1)    At its option at any time prior to Maturity, the Company may choose to redeem all or any portion of the Notes, at once or from time to time, in accordance with the provisions of paragraph number 7 of the form of the Notes in Exhibit A hereto.

(2)    To redeem the Notes, the Company must pay a redemption price in an amount determined in accordance with the provisions of paragraph number 7 of the form of the Notes in Exhibit A hereto, plus accrued and unpaid interest, if any, to, but excluding, the Redemption Date (subject to the right of Holders on the relevant record date to receive interest due on an Interest Payment Date that is on or before the Redemption Date).

(3)    Any redemption pursuant to this Section 3.1 shall otherwise be made in accordance with the provisions of Article Twelve of the Base Indenture.

SECTION 4.1    Supplemental Indenture Without Consent of Holders.

With respect to the Notes, Section 9.01 of the Base Indenture is hereby amended, solely with respect to the Notes, to add the following clause (8) to the end of the initial paragraph, to delete the word "or" at the end of clause (6) and to substitute “; or” for the period at the end of clause (7):

“(8) to conform the text of this Indenture or the 5.875% Senior Notes due 2026 (the “5.875% Notes”) issued by the Company hereunder to any provision of the “Description of the Notes” section of the Company’s prospectus supplement, dated March 15, 2016, or the “Description of Debt Securities” section of the Company’s base prospectus, dated November 20, 2015, in each case, relating to the initial offering of the 5.875% Notes, to the extent that such provisions were intended to be a verbatim recitation of a provision of this Indenture or of the 5.875% Notes.”

SECTION 5.1    Definitions.

All capitalized terms used herein and not otherwise defined below shall have the meanings ascribed thereto in the Base Indenture. The following are additional definitions used in this First Supplemental Indenture:

“Attributable Indebtedness,” when used with respect to any Sale and Leaseback Transaction, means, as at the time of determination, the present value, discounted at the rate set forth or implicit in the terms of the lease included in such transaction, of the total obligations of the lessee for rental payments, other than amounts required to be paid on account of property taxes, maintenance, repairs, insurance, assessments, utilities, operating and labor costs and other items that do not constitute payments for property rights during the remaining term of the lease included in such Sale and Leaseback Transaction including any period for which such lease has been extended. In the case of

any lease that is terminable by the lessee upon the payment of a penalty or other termination payment, such amount shall be the lesser of the amount determined assuming termination upon the first date such lease may be terminated, in which case the amount shall also include the amount of the penalty or termination payment, but no rent shall be considered as required to be paid under such lease subsequent to the first date upon which it may be so terminated, or the amount determined assuming no such termination.

“Consolidated Adjusted Net Assets” means the total amount of assets of the Company and its Subsidiaries, less (i) all current liabilities (excluding the amount of those liabilities that are by their terms extendable or renewable at the Company’s option to a date more than 12 months after the date of calculation and excluding current maturities of long-term debt) and (ii) total prepaid expenses and deferred charges; all as set forth, or on a pro forma basis would be set forth, on the consolidated balance sheet of the Company and its Subsidiaries, for the most recently completed fiscal quarter, prepared in accordance with generally accepted accounting principles.

“Funded Debt” means any indebtedness of the Company or any of its Subsidiaries which would, in accordance with generally accepted accounting principles, be classified as long-term debt or capital lease obligations, but in any event including all indebtedness for money borrowed, whether secured or unsecured, maturing more than one year, or extendible at the option of the obligor to a date more than one year, after the date of determination thereof (excluding any amount thereof included in current liabilities).

“Liens” means mortgages, liens, pledges, security interests or other encumbrances.

SECTION 5.2    Table of Contents, Headings, etc.

The table of contents and headings of the Articles and Sections of this First Supplemental Indenture have been inserted for convenience of reference only, are not to be considered a part hereof and shall in no way modify or restrict any of the terms or provisions hereof.

SECTION 5.3    Counterpart Originals.

The parties may sign any number of copies of this First Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. The exchange of copies of this First Supplemental Indenture and of signature pages by facsimile or PDF transmission shall constitute effective execution and delivery of this First Supplemental Indenture as to the parties hereto.

SECTION 5.4    Governing Law.

SECTION 5.5    Certain Trustee Matters.

The recitals contained herein shall be taken as the statements of the Company, and the Trustee assumes no responsibility for their correctness. The Trustee makes no representations as to the validity or sufficiency of this First Supplemental Indenture or the Notes or the proper authorization or the due execution hereof or thereof by the Company.

IN WITNESS WHEREOF, the parties hereto have caused this First Supplemental Indenture to be duly executed as of the date first written above.

IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed by its duly authorized officers.

TRUSTEE’S CERTIFICATE OF AUTHENTICATION:

This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

This Note is one of a duly authorized issue of debentures, notes or other evidences of indebtedness of HOLLYFRONTIER CORPORATION, a Delaware corporation (the “Company”), issued under the Indenture hereinafter referred to and is one of a series of such debentures, notes or other evidences of indebtedness designated pursuant thereto as 5.875% Senior Notes due 2026 (the “Notes”) of the Company.

1.    Interest.

The Company promises to pay interest on the principal amount of this Note at the rate of 5.875% per annum from          until Maturity of the Notes. The Company will pay interest semiannually in arrears on April 1 and October 1 of each year (each an “Interest Payment Date”) and on the Maturity of the Notes, or if any such day is not a Business Day, on the next succeeding Business Day. Interest on the Notes will accrue from the most recent Interest Payment Date on which interest has been paid or, if no interest has been paid, from March 22, 2016; provided that if there is no existing Default in the payment of, or provisions for, interest, and if this Note is authenticated between a Regular Record Date referred to on the face hereof (whether or not a Business Day) and the next succeeding Interest Payment Date, interest shall accrue from such next succeeding Interest Payment Date; provided, further, that the first Interest Payment Date shall be October 1, 2016. The interest so payable, and punctually paid or provided for, on any Interest Payment Date will, as provided in the Indenture, be paid to the Person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date for such interest as set forth on the face hereof; provided, however, that interest payable at Maturity of this Note will be payable to the Person to whom the principal hereof shall be payable. Any such interest which is so payable, but is not punctually paid or duly provided for on any Interest Payment Date, shall forthwith cease to be payable to the Holder on such Regular Record Date, and may be paid as more fully provided in the Indenture. Interest will be computed on the basis of a 360-day year of twelve 30-day months.

2.    Method of Payment.

Payment of the principal of (and premium, if any) and interest on this Note will be made at the office or agency of the Company maintained for that purpose in the Borough of Manhattan, New York, New York, or at such other offices or agencies maintained for such purpose as the Company may from time to time and in accordance with the Indenture designate, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that (i) payment of interest may, at the option of the Company, be made (subject to collection) by check mailed to the address of the Person entitled thereto as such address shall appear on the Security Register or, with respect to Notes evidenced by a Book-Entry Note, if appropriate wire transfer instructions have been received in writing by the Trustee, not later than five Business Days prior to the record date for an applicable Interest Payment Date, be made by wire transfer of immediately available funds in accordance with such

wire transfer instructions; and (ii) payment of the principal (and premium, if any) of this Note will be made upon surrender of this Note at the office or agency of the Company maintained for that purpose in the Borough of Manhattan, New York, New York or at such additional offices or agencies maintained for such purpose as the Company may from time to time and in accordance with the Indenture designate.

3.    Paying Agent and Registrar.

Initially, Wells Fargo Bank, National Association will, at its Corporate Trust Office, act as the Company’s office or agency where the Securities may be presented or surrendered for payment, where the Securities may be surrendered for registration of transfer or exchange and where notices and demands to or upon the Company in respect of the Securities and the Indenture may be served. The Corporate Trust Office is currently located at 750 N. Saint Paul Place, Suite 1750, Dallas, Texas 75201.

4.    Indenture.

Reference is made hereby to (i) the Indenture dated as of March 22, 2016 (the “Base Indenture”) between the Company as issuer and Wells Fargo Bank, National Association, as trustee (the “Trustee”) and (ii) the First Supplemental Indenture thereto dated as of March 22, 2016 (the “First Supplemental Indenture”), between the Company and the Trustee, providing for the issuance of the Notes. The Base Indenture, as amended and supplemented by the First Supplemental Indenture, and as may be further duly amended and supplemented in accordance with the terms thereof, is referred to herein as the “Indenture.” The terms of the Notes include those stated in the Indenture (including terms defined therein, which terms when used herein, unless the context requires otherwise, shall have the meanings assigned to such terms in the Indenture) and those made part of the Indenture by reference to the Trust Indenture Act of 1939, as amended (the “TIA”), as in effect on the date of execution of the Indenture. The Notes are subject to all such terms, and Holders are referred to the Indenture and the TIA for a statement of such terms.

The Notes are unsecured general obligations of the Company initially limited to $250,000,000 in aggregate principal amount and will rank on a parity with all other unsubordinated indebtedness of the Company; provided, however, that the authorized aggregate principal amount of the Notes may be increased above such amount as provided in the Indenture. The Indenture provides for the issuance of other series of debentures, notes and other evidences of indebtedness (including the Notes, the “Securities”) thereunder.

5.    Denominations; Transfer; Exchange.

The Notes are to be issued in registered form, without coupons, in denominations of $2,000 and integral multiples of $1,000 in excess thereof. A Holder may register the transfer of, or exchange, Notes in accordance with the Indenture. The Security Registrar may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and to pay any taxes or other governmental charges and fees required by law or permitted by the Indenture. The Company hereby irrevocably undertakes to the Holder hereof to exchange this Note in accordance with the terms of the Indenture without service charge.

6.    Person Deemed Owner.

The registered Holder of a Note may be treated as the owner of such Note for all purposes.

7.    Optional Redemption.

The Notes are redeemable, in whole or in part, at the option of the Company at any time or from time to time prior to Stated Maturity.

If the Notes are redeemed at any time prior to the Par Call Date (as defined below), the Notes will be redeemed at a Redemption Price equal to the greater of (1) 100% of the principal amount of the Notes to be redeemed and (2) the sum of the present values of the remaining scheduled payments of principal and interest on such Notes that would have been made if the Notes matured on the Par Call Date (exclusive of interest accrued to the Redemption Date) discounted to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 50 basis points, plus, in either case, accrued and unpaid interest on the principal amount being redeemed to, but excluding, such Redemption Date.

If the Notes are redeemed on or after the Par Call Date, the Notes will be redeemed at a Redemption Price equal to 100% of the principal amount of the Notes to be redeemed plus accrued and unpaid interest thereon to, but excluding, the Redemption Date.

In either case, the redemption is subject to the right of Holders of record on the relevant record date to receive interest due on an Interest Payment Date that is on or before the Redemption Date.

For purposes of determining the redemption price, the following definitions will apply:

“Comparable Treasury Issue” means the United States Treasury security selected by the Quotation Agent as having an actual or interpolated maturity comparable to the remaining term of the Notes to be redeemed, calculated as if the maturity date of the Notes were the Par Call Date (the “Remaining Life”), 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 Life.

“Comparable Treasury Price” means, with respect to any Redemption Date, the average of the Reference Treasury Dealer Quotations for such redemption date.

“Par Call Date” means January 1, 2026 (three months prior to the Stated Maturity of the Notes).

“Quotation Agent” means one of the Reference Treasury Dealers appointed by the Company.

“Reference Treasury Dealer” means each of (i) Citigroup Global Markets Inc., (ii) Merrill Lynch, Pierce, Fenner & Smith Incorporated, (iii) a Primary Treasury Dealer (as defined herein) selected by Mitsubishi UFJ Securities (USA), Inc., and (iv) a Primary Treasury Dealer (as defined herein) selected by Wells Fargo Securities, LLC, and their respective successors; provided, however, that if any of the foregoing shall cease to be a primary U.S. Government securities dealer in New York

City (a “Primary Treasury Dealer”), the Company will substitute therefor another Primary Treasury Dealer.

“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.

“Treasury Rate” means, with respect to any Redemption Date, the rate per year equal to the semi-annual equivalent yield to maturity or interpolated yield (on a day count basis) 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 such Redemption Date. The Treasury Rate will be calculated by the Quotation Agent on the third business day preceding the Redemption Date.

Any such redemption may, at the discretion of the Company, be conditioned upon the closing of another transaction, including a sale of securities or other financing, in each case as specified in the notice in reasonable detail. A notice of conditional redemption will be of no effect unless all conditions to the redemption have occurred on or before the Redemption Date or have been waived by the Company on or before the Redemption Date. The Company will provide notice of the satisfaction of all conditions as soon as practicable following occurrence of the conditions. The Company will provide notice of any waiver of a condition or failure to meet such condition no later than the Redemption Date.

The Company will mail a notice of redemption at least 20 days but not more than 60 days before the Redemption Date to each Holder of the Notes to be redeemed. If the Company elects to partially redeem the Notes, the Trustee will select the Notes to be redeemed in accordance with the provisions of Section 12.03 of the Indenture.

Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date, interest will cease to accrue on the Notes or portions thereof called for redemption.

8.    Amendment; Supplement; Waiver.

Subject to certain exceptions and limitations set forth below and in Section 9.02 of the Indenture, the Indenture may be supplemented with the consent of the Holders of not less than a majority in aggregate principal amount of the Outstanding Securities of each series affected by such supplemental indenture, and any past default under the Indenture with respect to the Notes, and its consequences, may be waived (other than a default in the payment of the principal of (or premium, if any) or interest on the Notes or in respect of a covenant or provision of the Indenture which under Article Nine thereof cannot be modified or amended without the consent of the Holder of each Outstanding Note) by the Holders of not less than a majority in aggregate principal amount of the Outstanding Notes in accordance with the terms of the Indenture. Without the consent of any Holder, the Company and the Trustee may supplement the Indenture (i) to cure any ambiguity, defect or inconsistency, in each case which shall not be inconsistent with the provisions of the Indenture and

which shall not adversely affect the interest of the Holders of any Securities in any material respect; (ii) to evidence the assumption by a successor Person of the obligations of the Company under the Indenture and this Note; (iii) to permit the issuance of Notes in uncertificated form, provided any such action shall not adversely affect the interest of the Holders of any Securities in any material respect; (iv) to add to the covenants of the Company for the benefit of the Holders of the Notes or Holders of other series of Securities, or to surrender any right or power conferred by the Indenture upon the Company; (v) to add to, delete from or revise the conditions, limitations and restrictions on the authorized amount, terms or purpose of issue, authentication and delivery of Securities as set forth in the Indenture; (vi) to evidence and provide for the acceptance of appointment under the Indenture by a successor Trustee with respect to the Notes and to add to or change any of the provisions of the Indenture as shall be necessary to provide for or facilitate the administration of the trusts thereunder by more than one Trustee, pursuant to the requirements of the Indenture; or (vii) to conform the text of the Indenture or the Notes to any provision of the “Description of the Notes” section of the Company’s prospectus supplement dated March 15, 2016, or the “Description of Debt Securities” section of the Company’s base prospectus dated November 20, 2015, to the extent that such provisions were intended to be a verbatim recitation of the Indenture or the Notes.

A supplemental indenture that changes or eliminates any covenant or other provision of the Indenture which has expressly been included solely for the benefit of one or more particular series of Securities under the Indenture, or which modifies the rights of the Holders of Securities of such series with respect to such covenant or other provision, shall be deemed not to affect the rights under the Indenture of the Holders of Securities of any other series.

9.    Defaults and Remedies.

Events of Default are defined in Section 5.01 of the Indenture and generally include: (i) failure to pay principal of or any premium on any Note when due and payable; (ii) failure to pay any interest on any Note when due and payable, and the continuation of the default for 30 days; (iii) failure to perform any other covenant of the Company in the Indenture, continued for 60 days (or, in the case of a default under Section 7.04 of the Indenture, 180 days) after written notice is given as provided in the Indenture; and (iv) certain events of bankruptcy, insolvency or reorganization in respect of the Company. If any Event of Default with respect to the Notes at any time outstanding occurs and is continuing (other than an Event of Default referred to in the preceding clause (iv)), either the Trustee or the Holders of at least 25% in aggregate principal amount of the then Outstanding Notes may declare the principal amount of all of the Notes to be due and payable immediately. If an Event of Default referred to in such clause (iv) occurs, such amount shall ipso facto become immediately due and payable. At any time after a declaration or occurrence of acceleration with respect to the Notes has been made, but before a judgment or decree based on such acceleration has been obtained, the Event of Default giving rise to such declaration of acceleration shall, under certain circumstances, be deemed to have been waived, and such declaration and its consequences shall be deemed to have been rescinded and annulled.

Holders may not enforce the Indenture or the Notes except as provided in the Indenture. The Trustee may require indemnity reasonably satisfactory to it before it enforces the Indenture or the Notes. Subject to certain limitations, Holders of a majority in aggregate principal amount of the

then Outstanding Notes may direct the Trustee in its exercise of any trust or power with respect to the Notes. The Trustee may withhold from Holders notice of any continuing default (except a default in payment of principal, premium (if any) or interest) if in good faith it determines that withholding notice is in their interests. The Company must furnish an annual compliance certificate to the Trustee.

10.    Discharge Prior to Maturity.

The Indenture shall be satisfied and discharged and the Notes canceled upon the payment of all Notes and, as provided in Article Four of the Indenture, shall be satisfied and discharged except for certain obligations upon the irrevocable deposit with the Trustee of funds sufficient for such payment.

11.    Trustee Dealings with Company.

The Trustee under the Indenture, in its individual or any other capacity, may make loans to, accept deposits from, and perform services for the Company or its Affiliates or any subsidiary of the Company’s Affiliates, and may otherwise deal with the Company or its Affiliates as if it were not the Trustee.

12. Authentication. 

This Note shall not be valid until authenticated by the manual signature of an authorized signer of the Trustee.

13. CUSIP Numbers. 

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Company has caused CUSIP numbers to be printed on the Notes as a convenience to the Holders of the Notes. No representation is made as to the correctness of such numbers as printed on the Notes and reliance may be placed only on the other identification numbers printed thereon.

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

Additional abbreviations may also be used though not in the above list.

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto

The following increases or decreases in the principal amount of this Book-Entry Note have been made: