PROOFPOINT, INC. as Issuer WELLS FARGO BANK, NATIONAL ASSOCIATION as Trustee, Note Registrar, Paying Agent, Transfer Agent, Authenticating Agent and Conversion Agent

Exhibit 4.1

PROOFPOINT, INC.

as Issuer

▇▇▇▇▇ FARGO BANK, NATIONAL ASSOCIATION

as Trustee, Note Registrar, Paying Agent, Transfer Agent,

Authenticating Agent and Conversion Agent

Indenture

Dated as of June 17, 2015

0.75% Senior Convertible Notes due 2020

TABLE OF CONTENTS

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EXHIBITS

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INDENTURE, dated as of June 17, 2015, among Proofpoint, Inc., a Delaware corporation (the “Company,” as more fully set forth in Section 1.02), ▇▇▇▇▇ Fargo Bank, National Association, in its capacity as trustee hereunder (the “Trustee,” as more fully set forth in Section 1.02) and as Note Registrar, Paying Agent, Transfer Agent, Authenticating Agent and Conversion Agent hereunder (each as defined herein and collectively, the “Agent”) (as amended or supplemented from time to time in accordance with the terms thereof, the “Indenture”).

RECITALS

WHEREAS, for its lawful corporate purposes, the Company has duly authorized the issuance of its 0.75% Senior Convertible Notes due 2020 (the “Notes”), in an aggregate principal amount not to exceed $230,000,000, and in order to provide the terms and conditions upon which the Notes are to be authenticated, issued and delivered, the Company has duly authorized the execution and delivery of this Indenture; and

WHEREAS, the Form of Note, the certificate of authentication to be borne by each Note, the Form of Notice of Conversion, the Form of Fundamental Change Purchase Notice and the Form of Assignment and Transfer to be borne by the Notes are to be substantially in the forms hereinafter provided for; and

WHEREAS, all acts and things necessary to make the Notes, when executed by the Company and authenticated and delivered by the Trustee or a duly authorized authenticating agent, as in this Indenture provided, the valid, binding and legal obligations of the Company, and to constitute these presents a valid agreement according to its terms, have been done and performed, and the execution of this Indenture and the issue hereunder of the Notes have in all respects been duly authorized;

NOW, THEREFORE, THIS INDENTURE WITNESSETH, for and in consideration of the premises and the purchases of the Notes by the Holders thereof, it is mutually agreed, for the benefit of the Company and the equal and proportionate benefit of all Holders of the Notes, as follows:

ARTICLE 1

DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

SECTION 1.01.                                                           General. The terms defined in Section 1.02 (except as herein otherwise expressly provided or unless the context otherwise requires) for all purposes of this Indenture and of any indenture supplemental hereto shall have the respective meanings specified in Section 1.02. All other terms used in this Indenture that are defined in the Securities Act (except as herein otherwise expressly provided or unless the context otherwise requires) shall have the meanings assigned to such terms in said Securities Act as in force at the date of the execution of this Indenture. The words “herein,” “hereof,” “hereunder,” and words of similar import refer to this Indenture as a whole and not to any particular Article, Section or other subdivision. The terms defined in this Article include the plural as well as the singular. All accounting terms not otherwise defined herein shall have the meanings assigned to them in accordance with generally accepted

accounting principles, and, except as otherwise herein expressly provided, the term “generally accepted accounting principles” with respect to any computation required or permitted hereunder shall mean such accounting principles as are generally accepted at the date of this instrument.

SECTION 1.02.                                                           Definitions.

“Additional Interest” has the meaning specified in Section 5.02.

“Additional Notes” has the meaning specified in Section 2.01.

“Additional Shares” has the meaning specified in Section 4.06(a).

“Affiliate” of any specified Person means any other Person directly or indirectly controlling or controlled by or under direct or indirect common control with such specified Person. For the purposes of this definition, “control,” when used with respect to any specified Person means the power to direct or cause the direction of the management and policies of such Person, directly or indirectly, whether through the ownership of voting securities, by contract or otherwise; and the terms “controlling” and “controlled” have meanings correlative to the foregoing.

“Authenticating Agent” has the meaning specified in Section 14.10.

“Bankruptcy Law” means Title 11, U.S. Code or any similar federal or state law for the relief of debtors.

“Bid Solicitation Agent” means the Company or such other Person as may be appointed, from time to time, by the Company to solicit market bid quotations for the Notes in accordance with Section 4.01(a)(ii).

“Board of Directors” means the board of directors of the Company or a committee of such board duly authorized to act for it hereunder.

“Board Resolution” means a copy of a resolution certified by the Secretary or an Assistant Secretary of the Company to have been duly adopted by the Board of Directors, and to be in full force and effect on the date of such certification, and delivered to the Trustee or an Agent, as the case may be.

“Business Day” means, with respect to any Note, any day other than a Saturday, a Sunday or a day on which the Federal Reserve Bank of New York or the Corporate Trust Office is authorized or required by law or executive order to close or to be closed.

“Capital Stock” means, for any entity, any and all shares, interests, rights to purchase, warrants, options, participations or other equivalents of or interests in (however designated) stock issued by that entity.

“Cash Settlement” has the meaning specified in Section 4.03(a).

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“Clause A Distribution” has the meaning specified in Section 4.04(c).

“Clause B Distribution” has the meaning specified in Section 4.04(c).

“Clause C Distribution” has the meaning specified in Section 4.04(c).

“close of business” means 5:00 p.m. (New York City time).

“Closing Date” means the date on which the Notes are originally issued under this Indenture.

“Combination Settlement” has the meaning specified in Section 4.03(a).

“Commission” means the Securities and Exchange Commission.

“Common Stock” means the shares of common stock, par value $0.0001 per share, of the Company as such shares of common stock exist on the date of this Indenture, subject to Section 4.07.

“Company” means Proofpoint, Inc., a Delaware corporation, and subject to the provisions of Article 6, shall include its successors and assigns but not any of their respective subsidiaries.

“Company Order” means a written request or order signed in the name of the Company by two Officers of the Company.

“Conversion Agent” means any conversion agent designated by the Company where Notes may be presented for conversion. The Conversion Agent shall initially be the Trustee.

“Conversion Date” has the meaning specified in Section 4.02(b).

“Conversion Notice” has the meaning specified in Section 4.02(b).

“Conversion Obligation” has the meaning specified in Section 4.03(a).

“Conversion Price” means, in respect of each Note, as of any date, $1,000, divided by the Conversion Rate as of such date.

“Conversion Rate” means, initially, 12.3108 shares of Common Stock per $1,000 principal amount of Notes, subject to adjustment as set forth herein.

“Conversion Redemption Observation Period” means the 20 consecutive trading-day period beginning on and including the 22nd scheduled trading day immediately preceding the applicable Redemption Date.

“Corporate Trust Office” means the principal office of the Trustee at which at any time its corporate trust business shall be administered, which office at the date hereof is located at ▇▇▇ ▇. ▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇ ▇▇, ▇▇▇ ▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇, Attention: Administrator of Proofpoint,

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Inc., except that for purposes of presentation of Notes for transfer or exchange the address is ▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇, or such other address as the Trustee may designate from time to time by notice to the Noteholders and the Company, or the principal corporate trust office of any successor Trustee (or such other address as such successor Trustee may designate from time to time by notice to the Holders and the Company).

“Custodian” means the Paying Agent, as custodian with respect to the Notes (so long as the Notes constitute Global Notes), or any successor entity.

“Daily Cash Amount” has the meaning specified in Section 4.03(d).

“Daily Conversion Value” means, for each of the 20 consecutive Trading Days during the Observation Period, 5% of the product of (i) the applicable Conversion Rate on such Trading Day and (ii) the Daily VWAP of the Common Stock on such Trading Day.

“Daily Settlement Amount” has the meaning specified in Section 4.03(d).

“Daily VWAP” means, for each of the 20 consecutive Trading Days during the Observation Period, the per share volume-weighted average price as displayed under the heading “Bloomberg VWAP” on Bloomberg page “PFPT <equity> AQR” (or any successor thereto) in respect of the period from the scheduled open of trading until the scheduled close of trading of the primary trading session on such Trading Day (or if such volume-weighted average price is unavailable, the market value of one share of Common Stock on such Trading Day, determined using a volume-weighted average method, by a nationally recognized independent investment banking firm retained for such purpose by the Company). The Daily VWAP will be determined without regard to afterhours trading or any other trading outside of the regular trading session trading hours.

“Default” means any event that is, or after notice or passage of time, or both, would be, an Event of Default.

“Defaulted Interest” means any interest on any Note that is payable, but is not punctually paid or duly provided for, on any Interest Payment Date.

“Depositary” or “Depository” means, with respect to the Global Notes the Person specified in Section 2.06 as the Depositary with respect to such Notes, until a successor shall have been appointed and become such pursuant to the applicable provisions of this Indenture, and thereafter, “Depositary” shall mean such successor Depositary.

“Effective Date” has the meaning specified in Section 4.06(c).

“Event of Default” has the meaning specified in Section 5.01.

“Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder.

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“Ex-Dividend Date” means, in respect of any dividend or distribution, the first date upon which the shares of Common Stock trade on the applicable exchange or in the applicable market, regular way, without the right to receive such issuance or distribution.

“Fiscal Year” means a fiscal year of the Company.

“Free Trade Date” means the date that is one year after the last date of the original issuance of the Notes.

“Fundamental Change” will be deemed to have occurred at the time after the Notes are originally issued if any of the following occurs:

(1)                                 a “person” or “group” within the meaning of Section 13(d) of the Exchange Act, other than the Company, its Subsidiaries, and its and their employee benefit plans, has become the direct or indirect “beneficial owner,” as defined in Rule 13d-3 under the Exchange Act, of the Company’s common equity representing more than 50% of the voting power of the Company’s outstanding common equity;

(2)                                 consummation of (A) any recapitalization, reclassification or change of the Company’s Common Stock (other than changes resulting from a subdivision or combination) as a result of which the Common Stock would be converted into, or exchanged for stock, other securities, other property or assets or (B) any share exchange, consolidation or merger of the Company pursuant to which the Common Stock will be converted into cash, securities or other property or any sale, lease or other transfer in one transaction or a series of transactions of all or substantially all of the consolidated assets of the Company and its Subsidiaries, taken as a whole, to any Person; provided, however, that a transaction where the holders of all classes of the Company’s common equity immediately prior to such transaction (each a “pre-transaction holder”) that is a share exchange, consolidation or merger own, directly or indirectly, more than 50% of all classes of common equity of the continuing or surviving corporation or transferee or the parent thereof immediately after such event shall not be a Fundamental Change, so long as the proportion of the respective ownership of each pre-transaction holder remains substantially the same relative to all other pre-transaction holders immediately following such event;

(3)                                 the Company’s stockholders approve any plan or proposal for the liquidation or dissolution of the Company; or

(4)                                 the Common Stock (or other common stock into which the Notes are then convertible) ceases to be listed or quoted on a national securities exchange in the United States.

For purposes of the foregoing definition, any transaction that constitutes a Fundamental Change pursuant to both clause (1) and clause (2) of the foregoing definition shall be deemed a Fundamental Change solely under clause (2) of such definition.

Notwithstanding the foregoing, a Fundamental Change as a result of clause (2) above will not be deemed to have occurred if at least 90% of the consideration received or to be received by the

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holders of the Common Stock, excluding cash payments for fractional shares, in connection with the transaction or transactions constituting the Fundamental Change consists of Publicly Traded Securities and as a result of such transaction or transactions the Notes become convertible into such Publicly Traded Securities, excluding cash payments for fractional shares, subject to the provisions set forth under Section 4.03 of this Indenture.

“Fundamental Change Company Notice” has the meaning specified in Section 3.01(b).

“Fundamental Change Purchase Date” has the meaning specified in Section 3.01(a).

“Fundamental Change Purchase Notice” has the meaning specified in Section 3.01(a)(i).

“Fundamental Change Purchase Offer” has the meaning specified in Section 3.01(a).

“Fundamental Change Purchase Price” has the meaning specified in Section 3.01(a).

“Global Note” shall have the meaning specified in Section 2.06(b).

“Holder” or “Noteholder” means a Person in whose name a Note is registered.

“Indenture” means this instrument, as originally executed and as supplemented from time to time by one or more indentures supplemental hereto.

“Initial Notes” has the meaning specified in Section 2.01.

“Initial Purchasers” means the initial purchasers set forth in Schedule 1 to the Purchase Agreement.

“Interest Payment Date” means, with respect to the payment of interest on the Notes, each June 15 and December 15 of each year, beginning on December 15, 2015.

“Last Reported Sale Price” of the Common Stock on any date means the closing sale price per share of Common Stock (or if no closing sale price is reported, the average of the bid and ask prices or, if more than one in either case, the average of the average bid and the average ask prices) on that date as reported in composite transactions for the principal U.S. securities exchange on which the Common Stock is traded. If the Common Stock is not listed for trading on a U.S. national or regional securities exchange on the relevant date, the “Last Reported Sale Price” shall be the last quoted bid price for the Common Stock in the over-the-counter market on the relevant date as reported by OTC Markets Group, Inc. or a similar organization. If the Common Stock is not so quoted, the “Last Reported Sale Price” shall be the average of the mid-point of the last bid and ask prices for the Common Stock on the relevant date from each of at least three nationally recognized independent investment banking firms selected by the Company for this purpose.

“Make-Whole Fundamental Change” means any transaction or event that constitutes a Fundamental Change (determined after giving effect to any exceptions or exclusions to such definition, but without regard to the proviso in clause (2) of the definition of Fundamental Change).

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“Market Disruption Event” means (i) a failure by the primary United States national or regional securities exchange or market on which the Common Stock is listed or admitted to trading to open for trading during its regular trading session or (ii) the occurrence or existence prior to 1:00 p.m., New York City time, on any Scheduled Trading Day for more than a one half-hour period in the aggregate during regular trading hours of any suspension or limitation imposed on trading (by reason of movements in price exceeding limits permitted by the relevant stock exchange or otherwise) in the Common Stock or in any options, contracts or future contracts relating to the Common Stock.

“Merger Event” has the meaning specified in Section 4.07(a).

“Note” or “Notes” has the meaning specified in the fourth paragraph of the recitals of this Indenture, and shall include any Additional Notes issued pursuant to Section 2.01 hereof.

“Note Register” shall have the meaning specified in Section 2.06(a).

“Note Registrar” shall have the meaning specified in Section 2.06(a).

“Observation Period” with respect to any Note means (i) if the relevant Conversion Date occurs prior to the 25th Scheduled Trading Day prior to June 15, 2020, and a Cash Settlement or a Combination Settlement applies, the 20 consecutive Trading Day period beginning on and including the second Scheduled Trading Day after such Conversion Date, (ii) if the relevant Conversion Date occurs on or after the 25th Scheduled Trading Day prior to June 15, 2020, and regardless of the Settlement Method, the 20 consecutive Trading Days beginning on and including the 22nd Scheduled Trading Day immediately preceding June 15, 2020, and (iii) notwithstanding the foregoing, if the relevant Conversion Date occurs after the date of the issuance of a Redemption Notice as described under Article 15 hereof, but prior to the close of business on the Business Day immediately preceding the applicable Redemption Date, the Conversion Redemption Observation Period.

“Offering Memorandum” means the offering memorandum dated June 11, 2015 relating to the purchase and resale of the Notes.

“Officer” means, with respect to the Company, the Chief Executive Officer, the President, the Chief Financial Officer, any Vice President, the Treasurer, any Assistant Treasurer, the Secretary or any Assistant Secretary.

“Officers’ Certificate” means a certificate signed by two Officers of the Company, one of whom must be the principal executive officer, the principal financial officer or the principal accounting officer of the Company.

“open of business” means 9:00 a.m. (New York City time).

“Opinion of Counsel” means an opinion in writing acceptable to the Trustee or the Agent (as the case may be) signed by legal counsel, who may be an employee of or counsel to the

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Company, that is delivered to the Trustee or the Agent, as the case may be. Each such opinion shall include the statements provided for in Section 14.05 if and to the extent required by the provisions of such Section.

“outstanding,” when used with reference to Notes, shall, subject to the provisions of Section 12.04, mean, as of any particular time, all Notes authenticated and delivered by the Authenticating Agent under this Indenture, except:

(a)                                 Notes theretofore canceled by the Authenticating Agent or accepted by the Authenticating Agent for cancellation;

(b)                                 Notes, or portions thereof, for the payment or repurchase of which monies in the necessary amount shall have been deposited in trust with the Paying Agent (other than the Company) or shall have been set aside and segregated in trust by the Company (if the Company shall act as its own Paying Agent);

(c)                                  Notes that have been paid pursuant to Section 2.07 or Notes in lieu of which, or in substitution for which, other Notes shall have been authenticated and delivered pursuant to the terms of Section 2.07 unless proof satisfactory to the Authenticating Agent is presented that any such Notes are held by protected purchasers in due course; and

(d)                                 Notes converted pursuant to Article 4.

“Paying Agent” shall have the meaning specified in Section 9.02.

“Person” means an individual, a corporation, a limited liability company, an association, a partnership, a joint venture, a joint stock company, a trust, an unincorporated organization or a government or an agency or a political subdivision thereof.

“Physical Notes” means certificated Notes in definitive form that are not Global Notes.

“Physical Settlement” has the meaning specified in Section 4.03(a).

“Predecessor Note” of any particular Note means every previous Note evidencing all or a portion of the same debt as that evidenced by such particular Note; and, for the purposes of this definition, any Note authenticated and delivered under Section 2.07 in lieu of or in exchange for a mutilated, lost, destroyed or stolen Note shall be deemed to evidence the same debt as the mutilated, lost, destroyed or stolen Note that it replaces.

“Publicly Traded Securities” means shares of common stock traded on a national securities exchange in the United States or which will be so traded or quoted when issued or exchanged in connection with a Fundamental Change.

“Purchase Agreement” means the purchase agreement dated as of June 11, 2015 between the Company and the Initial Purchasers.

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“Redemption Date” means the date specified for redemption of the Notes in accordance with the terms of the Notes and Article 15.

“Redemption Notice” has the meaning specified in Section 15.04.

“Redemption Price” has the meaning specified in Section 15.01.

“Regular Record Date” means, with respect to the payment of interest on the Notes, the June 1 (whether or not a Business Day) immediately preceding an Interest Payment Date on June 15 and the December 1 (whether or not a Business Day) immediately preceding an Interest Payment Date on December 15.

“Reference Property” has the meaning specified in Section 4.07(a).

“Resale Restriction Termination Date,” (i) with respect to the Notes, shall have the meaning specified in the legend set forth in Section 2.04(a), and (ii) with respect to the Common Stock issued upon conversion of the Notes, shall have the meaning specified in the legend set forth in Section 2.04(b).

“Responsible Officer” means, when used with respect to the Trustee or the Agent (as applicable), any officer within the corporate trust department of the Trustee or the Agent (as applicable), including any vice president, assistant vice president, trust officer or any other officer of the Trustee or the Agent (as applicable) who customarily performs functions similar to those performed by the persons who at the time shall be such officers, respectively, or to whom any corporate trust matter is referred because of such person’s knowledge of and familiarity with the particular subject and who shall have direct responsibility for the administration of this Indenture.

“Scheduled Trading Day” means a day that is scheduled to be a Trading Day on the primary United States national securities exchange or market on which the Common Stock is listed or admitted for trading. If the Common Stock is not so listed or admitted for trading, “Scheduled Trading Day” means a Business Day.

“Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder.

“Settlement Method” means any of Cash Settlement, Physical Settlement or Combination Settlement.

“Significant Subsidiary” of any Person means any “significant subsidiary” of such Person within the meaning of Article 1, Rule 1-02(w) of Regulation S-X promulgated under the Securities Act.

“Spin-Off” has the meaning specified in Section 4.04(c).

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“Stated Maturity” means, with respect to any Note and the payment of the principal amount thereof, June 15, 2020.

“Stock Price” has the meaning specified in Section 4.06(b).

“Subsidiary” means, with respect to any Person, any corporation, association, partnership or other business entity of which more than 50% of the total voting power of shares of Capital Stock or other interests (including partnership interests) entitled (without regard to the occurrence of any contingency) to vote in the election of directors, managers, general partners or trustees thereof is at the time owned or controlled, directly or indirectly, by (i) such Person; (ii) such Person and one or more Subsidiaries of such Person; or (iii) one or more Subsidiaries of such Person.

“Trading Day” means, except as otherwise provided in Section 4.03(g), a day on which (i) trading in the Common Stock generally occurs on The NASDAQ Global Market or, if the Common Stock is not then listed on The NASDAQ Global Market, on the principal other United States national or regional securities exchange on which the Common Stock is then listed or, if the Common Stock is not then listed on a United States national or regional securities exchange, in the principal other market on which the Common Stock is then traded, and (ii) a Last Reported Sale Price for the Common Stock is available on such securities exchange or market. If the Common Stock (or other security for which a closing sale price must be determined) is not so listed or traded, “Trading Day” means a Business Day.

“Trading Price” of the Notes on any date of determination means the average of the secondary market bid quotations obtained by the Bid Solicitation Agent for $2,000,000 principal amount of the Notes at approximately 3:30 p.m., New York City time, on such determination date from three independent nationally recognized securities dealers selected by the Company; provided that, if three bids cannot reasonably be obtained by the Bid Solicitation Agent but only two such bids are obtained, then the average of the two bids shall be used, and if only one such bid can reasonably be obtained by the Bid Solicitation Agent, that one bid shall be used. If the Bid Solicitation Agent cannot reasonably obtain at least one bid for $2,000,000 principal amount of the Notes from a nationally recognized securities dealer, then the Trading Price per $1,000 principal amount of Notes will be deemed to be less than 98% of the product of the Last Reported Sale Price of the Common Stock and the applicable Conversion Rate.

“Trading Price Condition” has the meaning specified in Section 4.01(a)(ii).

“Trigger Event” has the meaning specified in Section 4.04(c).

“Trustee” means the Person named as the “Trustee” in the first paragraph of this Indenture until a successor Trustee shall have become such pursuant to the applicable provisions of this Indenture, and thereafter “Trustee” shall mean or include each Person who is then a Trustee hereunder.

“U.S.” means the United States of America.

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“Valuation Period” has the meaning specified in Section 4.04(c).

ARTICLE 2

THE SECURITIES

SECTION 2.01.                    Designation and Amount.  The Notes shall be designated as the “0.75% Convertible Senior Notes due 2020.” The aggregate principal amount of Notes that may be authenticated and delivered under this Indenture is limited to $230,000,000 (the “Initial Notes”), except for Notes authenticated and delivered upon registration or transfer of, or in exchange for, or in lieu of other Notes pursuant to Section 2.06, Section 2.07, Section 3.04, Section 4.02 and Section 7.04 hereof.

The principal amount of Notes then outstanding shall be payable at Stated Maturity.

The Company may, without the consent of the Holders of the Notes, hereafter issue additional notes (“Additional Notes”) under the Indenture with the same terms (other than payment by the purchaser of interest accrued from the date hereof or the most recent Interest Payment Date, as applicable, to but excluding the issue date of such Additional Notes) and with the same CUSIP numbers (except to the extent necessary for securities law purposes) as the Initial Notes in an unlimited aggregate principal amount; provided that such Additional Notes must be fungible with the Initial Notes for federal income tax purposes. Any such Additional Notes shall constitute a single series together with the Initial Notes for all purposes hereunder, including, without limitation, for purposes of any waivers, supplements or amendments to the Indenture requiring the approval of Holders of the Notes and any offers to purchase the Notes.

SECTION 2.02.                    Form of Notes.  The Notes and the Authenticating Agent’s certificate of authentication to be borne by such Notes shall be substantially in the respective forms set forth in Exhibit A, which are incorporated in and made a part of this Indenture.

Any Global Note may be endorsed with or have incorporated in the text thereof such legends or recitals or changes not inconsistent with the provisions of this Indenture as may be required by the Custodian or the Depositary, or as may be required to comply with any applicable law or any regulation thereunder or with the rules and regulations of any securities exchange or automated quotation system upon which the Notes may be listed or traded or designated for issuance or to conform with any usage with respect thereto, or to indicate any special limitations or restrictions to which any particular Notes are subject.

Any of the Notes may have such letters, numbers or other marks of identification and such notations, legends or endorsements as the officers executing the same may approve (execution thereof to be conclusive evidence of such approval) and as are not inconsistent with the provisions of this Indenture, or as may be required to comply with any law or with any rule or regulation made pursuant thereto or with any rule or regulation of any securities exchange or automated quotation system on which the Notes may be listed or designated for issuance, or to conform to usage or to indicate any special limitations or restrictions to which any particular Notes are subject.

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The Global Note shall represent such 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 increased or reduced to reflect repurchases, conversions, transfers or exchanges permitted hereby. Any endorsement of the Global Note to reflect the amount of any increase or decrease in the amount of outstanding Notes represented thereby shall be made by the Transfer Agent or the Custodian, at the direction of the Paying Agent, in such manner and upon instructions given by the holder of such Notes in accordance with this Indenture. Payment of principal, accrued and unpaid interest, and premium, if any (including any Fundamental Change Purchase Price or the Redemption Price in connection with an optional redemption), on the Global Note shall be made to the holder of such Note on the date of payment, unless a record date or other means of determining holders eligible to receive payment is provided for herein.

The Form of Note, the Form of Notice of Conversion, the Form of Fundamental Change Purchase Notice and the Form of Assignment and Transfer shall be substantially as set forth in Exhibits A, B, C and D, respectively, hereto, which are incorporated into and shall be deemed a part of this Indenture, in each case 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 may be required to comply with the rules of any securities exchange or as may, consistently herewith, be determined to be necessary or appropriate by the officers of the Company executing such Notes, as evidenced by their execution of the Notes.

SECTION 2.03.                    Date and Denomination of Notes; Payments of Interest.  (a) The Notes shall be issuable in registered form without coupons in denominations of $1,000 principal amount and integral multiples thereof. Each Note shall be dated the date of its authentication and shall bear interest from the date specified on the face of the form of Note attached as Exhibit A hereto. Interest on the Notes shall be computed on the basis of a 360-day year comprised of twelve 30-day months.

The Person in whose name any Note (or its Predecessor Note) is registered on the Note Register at the close of business on any Regular Record Date with respect to any Interest Payment Date shall be entitled to receive the interest payable on such Interest Payment Date. Interest shall be payable at the office or agency of the Company maintained by the Company for such purposes, which shall initially be the Corporate Trust Office of the Trustee. The Company shall pay interest (a) on any Notes in certificated form (i) to Holders holding Notes in an aggregate principal amount of $1,000,000 or less, by check mailed to that Person and (ii) to Holders holding Notes in an aggregate principal amount of $1,000,000 or more, by wire transfer in immediately available funds to that Person’s account within the United States (which account is specified in writing by such Person at least three Business Days prior to such payment), which application shall remain in effect until such Person notifies, in writing, the Note Registrar to the contrary, or (b) on any Global Note by wire transfer of immediately available funds to the account of the Depositary or its nominee.

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Any Defaulted Interest shall forthwith cease to be payable to the Noteholder on the relevant Regular Record Date by virtue of its having been such Noteholder, and such Defaulted Interest shall be paid by the Company, at its election in each case, as provided in clause (1) or (2) below:

(1)           The Company may elect to make payment of any Defaulted Interest to the Persons in whose names the Notes (or their respective Predecessor Notes) are registered at the close of business on a special record date for the payment of such Defaulted Interest, which shall be fixed in the following manner. The Company shall notify the Trustee and the Paying Agent in writing of the amount of Defaulted Interest proposed to be paid on each Note and the date of the proposed payment (which shall be not less than 40 days after the receipt by the Trustee and the Paying Agent of such notice, unless the Trustee and the Paying Agent shall consent to an earlier date), and at the same time the Company shall deposit with the Paying Agent an amount of money equal to the aggregate amount to be paid in respect of such Defaulted Interest or shall make arrangements satisfactory to the Paying Agent for such deposit on or prior to the date of the proposed payment, such money when deposited to be held in trust for the benefit of the Persons entitled to such Defaulted Interest as in this clause provided. Thereupon the Company shall fix a special record date for the payment of such Defaulted Interest which shall be not more than fifteen days and not less than ten days prior to the date of the proposed payment, and not less than ten days after the receipt by the Trustee and the Paying Agent of the notice of the proposed payment. The Company shall promptly notify the Trustee and the Paying Agent in writing of such special record date and the Trustee and the Paying Agent, in the name and at the expense of the Company, shall cause notice of the proposed payment of such Defaulted Interest and the special record date therefor to be mailed, first-class postage prepaid, to each holder at its address as it appears in the Note Register, not less than ten days prior to such special record date. Notice of the proposed payment of such Defaulted Interest and the special record date therefor having been so mailed, such Defaulted Interest shall be paid to the Persons in whose names the Notes (or their respective Predecessor Notes) are registered at the close of business on such special record date and shall no longer be payable pursuant to the following clause (2) of this Section 2.03.

(2)           The Company may make payment of any Defaulted Interest in any other lawful manner not inconsistent with the requirements of any securities exchange or automated quotation system on which the Notes may be listed or designated for issuance, and upon such notice as may be required by such exchange or automated quotation system, if, after notice given by the Company to the Trustee and the Paying Agent of the proposed payment pursuant to this clause, such manner of payment shall be deemed practicable by the Paying Agent.

SECTION 2.04.                    Restrictive Legends.

(a)           Every Note that bears or is required under this Section 2.04(a) to bear the legend set forth in this Section 2.04(a) (together with any Common Stock issued upon conversion of the Notes and required to bear the legend set forth in Section 2.04(b), collectively, the “Restricted Securities”) shall be subject to the restrictions on transfer set forth in this Section 2.04(a) (including those contained in the legend set forth below), unless such restrictions on transfer shall be eliminated or otherwise waived by written consent of the Company with written notice to the Trustee and the

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Paying Agent as provided below. The Holder of each such Restricted Security, by such Holder’s acceptance thereof, agrees to be bound by all such restrictions on transfer. As used in this Section 2.04(a) and Section 2.04(b), the term “transfer” encompasses any sale, pledge, transfer or other disposition whatsoever of any Restricted Security.

Until the Resale Restriction Termination Date, any certificate evidencing such Note (and all securities issued in exchange therefor or substitution thereof, other than Common Stock, if any, issued upon conversion thereof, which shall bear the legend set forth in Section 2.04(b), if applicable) shall bear a legend in substantially the following form (unless such Notes have been transferred pursuant to a registration statement that has become or been declared effective under the Securities Act and that continues to be effective at the time of such transfer, or sold pursuant to the exemption from registration provided by Rule 144 or any similar provision then in force under the Securities Act, or unless otherwise agreed by the Company in writing, with notice thereof to the Trustee and the Paying Agent):

THIS NOTE AND THE COMMON STOCK, IF ANY, ISSUABLE UPON CONVERSION OF THIS NOTE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED PRIOR TO THE RESALE RESTRICTION TERMINATION DATE EXCEPT:

(A)          TO THE COMPANY OR ANY SUBSIDIARY THEREOF, OR

(B)          PURSUANT TO A REGISTRATION STATEMENT WHICH HAS BECOME EFFECTIVE UNDER THE SECURITIES ACT, OR

(C)          TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, OR

(D)          PURSUANT TO AN EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT OR ANY OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT.

PRIOR TO THE REGISTRATION OF ANY TRANSFER IN ACCORDANCE WITH CLAUSE (D) ABOVE, THE COMPANY, THE TRUSTEE, AND THE PAYING AGENT RESERVE THE RIGHT TO REQUIRE THE DELIVERY OF SUCH LEGAL OPINIONS, CERTIFICATIONS OR OTHER EVIDENCE AS MAY REASONABLY BE REQUIRED IN ORDER TO DETERMINE THAT THE PROPOSED TRANSFER IS BEING MADE IN COMPLIANCE WITH THE SECURITIES ACT AND APPLICABLE STATE SECURITIES LAWS. NO REPRESENTATION IS MADE AS TO THE AVAILABILITY OF ANY EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT.

THE “RESALE RESTRICTION TERMINATION DATE” MEANS THE LATER OF: (A) THE DATE THAT IS ONE YEAR AFTER THE LAST ORIGINAL ISSUANCE DATE OF THE NOTES OR SUCH SHORTER PERIOD OF TIME PERMITTED BY RULE 144 OR ANY

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SUCCESSOR PROVISION THERETO; AND (B) SUCH LATER DATE, IF ANY, AS MAY BE REQUIRED BY APPLICABLE LAW.

No transfer of any Note prior to the Resale Restriction Termination Date will be registered by the Note Registrar unless the applicable box on the Form of Assignment and Transfer has been checked.

Any Note (or security issued in exchange or substitution therefor) as to which such restrictions on transfer shall have expired in accordance with their terms may, upon surrender of such Note for exchange to the Note Registrar in accordance with the provisions of this Section 2.04(a), be exchanged for a new Note or Notes, of like tenor and aggregate principal amount, which shall not bear the restrictive legend required by this Section 2.04(a) and shall not be assigned a restricted CUSIP number. No later than the fifth day immediately following the Free Trade Date, the Company shall cause every beneficial interest in any Note represented by a Global Note that bears the restricted legend specified in this Section 2.04(a) to be automatically exchanged for beneficial interests in a Global Note that shall not bear such restrictive legend and shall not be assigned a restricted CUSIP number. To effect such exchange, the Company (A) will deliver to the Depositary an instruction letter for the Depositary’s mandatory exchange process at least 15 days immediately prior to the Free Trade Date and (B) will deliver to each of the Trustee and the Note Registrar a duly completed free transferability certificate in the form set forth on Exhibit E (the “Free Transferability Certificate”) promptly upon the occurrence of the Free Trade Date. Upon receipt of the Free Transferability Certificate by the Trustee and the Note Registrar, the legend set forth above shall be deemed removed from each Global Note specified in the Free Transferability Certificate and the restricted CUSIP number shall be deemed removed from each such Global Note and deemed replaced with an unrestricted CUSIP number, with no further action required by the Company, the Trustee, the Note Registrar, or, if applicable, the Depositary. Prior to the Company’s delivery of the Free Transferability Certificate and afterwards, the Company, the Trustee, and the Note Registrar will comply with the rules and procedures of the Depositary and otherwise use reasonable efforts to cause each Global Note to be identified by an unrestricted CUSIP number in the facilities of the Depositary by the Free Trade Date or as promptly as possible thereafter. In addition, on the Free Trade Date or promptly thereafter, the Company, or the Trustee upon written instruction by the Company, will provide Bloomberg L.P. with a copy of the Free Transferability Certificate and will use reasonable efforts to cause Bloomberg L.P. to adjust its screen page for the Notes to indicate that the Notes are no longer Restricted Securities and are now identified by an unrestricted CUSIP number.

The Company shall promptly notify the Trustee, the Agent, and the Holders in writing after any registration statement, if any, with respect to the Notes or any Common Stock issued upon conversion of the Notes has been declared effective under the Securities Act.

(b)           Until the Resale Restriction Termination Date, any stock certificate representing Common Stock issued upon conversion of such Note shall bear a legend in substantially the following form (unless the Note or such Common Stock has been transferred pursuant to a registration statement that has become or been declared effective under the Securities Act and that

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continues to be effective at the time of such transfer, or pursuant to the exemption from registration provided by Rule 144 or any similar provision then in force under the Securities Act, or such Common Stock has been issued upon conversion of Notes that have been transferred pursuant to a registration statement that has become or been declared effective under the Securities Act and that continues to be effective at the time of such transfer, or pursuant to the exemption from registration provided by Rule 144 or any similar provision then in force under the Securities Act, or unless otherwise agreed by the Company with written notice thereof to the Transfer Agent and any other transfer agent for the Common Stock):

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED PRIOR TO THE RESALE RESTRICTION TERMINATION DATE EXCEPT:

(A)          TO THE COMPANY OR ANY SUBSIDIARY THEREOF, OR

(B)          PURSUANT TO A REGISTRATION STATEMENT WHICH HAS BECOME EFFECTIVE UNDER THE SECURITIES ACT, OR

(C)          TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, OR

(D)          PURSUANT TO AN EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT OR ANY OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT.

PRIOR TO THE REGISTRATION OF ANY TRANSFER IN ACCORDANCE WITH CLAUSE (D) ABOVE, THE COMPANY AND THE TRANSFER AGENT FOR THE COMPANY’S COMMON STOCK RESERVE THE RIGHT TO REQUIRE THE DELIVERY OF SUCH LEGAL OPINIONS, CERTIFICATIONS OR OTHER EVIDENCE AS MAY REASONABLY BE REQUIRED IN ORDER TO DETERMINE THAT THE PROPOSED TRANSFER IS BEING MADE IN COMPLIANCE WITH THE SECURITIES ACT AND APPLICABLE STATE SECURITIES LAWS. NO REPRESENTATION IS MADE AS TO THE AVAILABILITY OF ANY EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT.

THE “RESALE RESTRICTION TERMINATION DATE” MEANS THE LATER OF: (A) THE DATE THAT IS ONE YEAR AFTER THE LAST ORIGINAL ISSUANCE DATE OF THE COMPANY’S 0.75% SENIOR CONVERTIBLE NOTES DUE 2020 OR SUCH SHORTER PERIOD OF TIME PERMITTED BY RULE 144 OR ANY SUCCESSOR PROVISION THERETO; AND (B) SUCH LATER DATE, IF ANY, AS MAY BE REQUIRED BY APPLICABLE LAW.

Any such Common Stock as to which such restrictions on transfer shall have expired in accordance with their terms may, upon surrender of the certificates representing such shares of

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Common Stock for exchange in accordance with the procedures of the transfer agent for the Common Stock, be exchanged for a new certificate or certificates for a like aggregate number of shares of Common Stock, which shall not bear the restrictive legend required by this Section 2.04(b).

(c)           The Company shall not, and shall not permit any of the “affiliates” (as defined in Rule 144) it controls to, resell any of the Notes that constitute “restricted securities” under Rule 144 that have been reacquired by any of them.

SECTION 2.05.                    Execution, Authentication and Delivery of Notes.  The Notes shall be signed in the name and on behalf of the Company by the manual or facsimile signature of its Chief Executive Officer, President, Treasurer, Secretary or any of its Vice Presidents.

At any time and from time to time after the execution and delivery of this Indenture, the Company may deliver Notes executed by the Company to the Authenticating Agent for authentication, together with a Company Order for the authentication and delivery of such Notes, which order shall set forth the number of separate Note certificates, the principal amount of each of the Notes to be authenticated, the date on which the original issuance of Notes is to be authenticated, the registered holders of the said Notes and delivery instructions, and the Authenticating Agent in accordance with such Company Order shall authenticate and deliver such Notes.

Only such Notes as shall bear thereon a certificate of authentication substantially in the form set forth on the form of Note attached as Exhibit A hereto, executed manually by an authorized signatory of the Authenticating Agent, shall be entitled to the benefits of this Indenture or be valid or obligatory for any purpose. Such certificate by the Authenticating Agent upon any Note executed by the Company shall be conclusive evidence that the Note so authenticated has been duly authenticated and delivered hereunder and that the holder is entitled to the benefits of this Indenture.

In case any officer of the Company who shall have signed any of the Notes shall cease to be such officer before the Notes so signed shall have been authenticated and delivered by the Authenticating Agent, or disposed of by the Company, such Notes nevertheless may be authenticated and delivered or disposed of as though the person who signed such Notes had not ceased to be such officer of the Company; and any Note may be signed on behalf of the Company by such persons as, at the actual date of the execution of such Note, shall be the proper officers of the Company, although at the date of the execution of this Indenture any such person was not such an officer.

SECTION 2.06.                    Exchange and Registration of Transfer of Notes; Depositary.

(a)           The Company shall cause to be kept at the Corporate Trust Office of the Trustee a register (the register maintained in such office or in any other office or agency of the Company designated pursuant to Section 9.02 being herein sometimes collectively referred to as the “Note Register”) in which, subject to such reasonable regulations as it may prescribe, the Company shall provide for the registration of Notes and of transfers of Notes. Such register shall be in written form or in any form capable of being converted into written form within a reasonable period of time.

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The Company initially appoints the Trustee as “Note Registrar” for the purpose of registering Notes and transfers of Notes as herein provided. The Company may appoint one or more co-registrars in accordance with Section 9.02.

Upon surrender for registration of transfer of any Note to the Note Registrar or any co-registrar, and satisfaction of the requirements for such transfer set forth in this Section 2.06, the Company shall execute, and the Authenticating Agent shall authenticate and deliver, in the name of the designated transferee or transferees, one or more new Notes of any authorized denominations and of a like aggregate principal amount and bearing such restrictive legends as may be required by this Indenture.

Notes may be exchanged for other Notes of any authorized denominations and of a like aggregate principal amount, upon surrender of the Notes to be exchanged at any such office or agency maintained by the Company pursuant to Section 9.02. Whenever any Notes are so surrendered for exchange, the Company shall execute, and the Authenticating Agent shall authenticate and deliver, the Notes that the holder making the exchange is entitled to receive, bearing registration numbers not contemporaneously outstanding.

All Notes presented or surrendered for registration of transfer or for exchange, repurchase or conversion shall (if so required by the Company, the Transfer Agent, the Paying Agent, the Conversion Agent, the Note Registrar or any co-registrar) be duly endorsed, or be accompanied by a written instrument or instruments of transfer in form satisfactory to the Company and duly executed by the holder thereof or its attorney-in-fact duly authorized in writing.

No service charge shall be charged to the Noteholder for any exchange or registration of transfer of Notes, but the Company, the Agent, or the Trustee may require payment of a sum sufficient to cover any tax, assessments or other governmental charges that may be imposed in connection therewith as a result of the name of the holder of the new Notes issued upon such exchange or registration of transfer of Notes being different from the name of the holder of the old Notes presented or surrendered for such exchange or registration of transfer.

None of the Company, the Trustee, the Agent, the Note Registrar or any co-registrar shall be required to exchange or register a transfer of (i) any Notes surrendered for conversion or, if a portion of any Note is surrendered for conversion, such portion thereof surrendered for conversion or (ii) any Notes, or a portion of any Note, surrendered for repurchase (and not withdrawn) in accordance with Article 3 hereof.

All Notes issued upon any registration of transfer or exchange of Notes in accordance with this Indenture shall be the valid obligations of the Company, evidencing the same debt, and entitled to the same benefits under this Indenture as the Notes surrendered upon such registration of transfer or exchange.

(b)           So long as the Notes are eligible for book-entry settlement with the Depositary, unless otherwise required by law, all Notes shall be represented by one or more Notes in global form (each, a “Global Note”) registered in the name of the Depositary or the nominee of the

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Depositary. The transfer and exchange of beneficial interests in a Global Note that does not involve the issuance of a Physical Note shall be effected through the Depositary (but not the Transfer Agent, the Paying Agent, the Trustee or the Custodian) in accordance with this Indenture and the procedures of the Depositary therefor.

(c)           Members of, or participants in, the Depositary shall have no rights under this Indenture with respect to any Global Note held on their behalf by the Depositary or under the Global Note, and the Depositary (including, for this purpose, its nominee) may be treated by the Company, the Transfer Agent, the Paying Agent, the Trustee and any agent of the Company or the Trustee as the absolute owner and Holder of such Global Note for all purposes whatsoever.

(d)           Notwithstanding any other provisions of this Indenture (other than the provisions set forth in this Section 2.04(a)), a Global Note may not be transferred as a whole or in part except (i) by the Depositary to a nominee of the Depositary or by a nominee of the Depositary to the Depositary or another nominee of the Depositary or by the Depositary or any such nominee to a successor Depositary or a nominee of such successor Depositary and (ii) for transfers of portions of a Global Note in certificated form made upon request of a member of, or a participant in, the Depositary (for itself or on behalf of a beneficial owner) by written notice given to the Trustee by or on behalf of the Depositary in accordance with customary procedures of the Depositary and in compliance with this Section 2.04(a).

The Depositary shall be a clearing agency registered under the Exchange Act. The Company initially appoints The Depository Trust Company (“DTC”) to act as Depositary with respect to each Global Note. Initially, each Global Note shall be issued to the Depositary, registered in the name of Cede & Co., as the nominee of the Depositary, and deposited with the Paying Agent as custodian for Cede & Co. Neither the Trustee, the Agent nor any agent thereof shall have any responsibility or liability for any actions taken or not taken by the Depositary.

If (i) the Depositary notifies the Company at any time that the Depositary is unwilling or unable to continue as depositary for the Global Notes and a successor depositary is not appointed within 90 days, (ii) the Depositary ceases to be registered as a clearing agency under the Exchange Act and a successor depositary is not appointed within 90 days, or (iii) an Event of Default with respect to the Notes has occurred and is continuing and a beneficial owner of any Note requests that its beneficial interest therein be issued as a Physical Note, the Company shall execute, and the Authenticating Agent, upon receipt of an Officers’ Certificate and a Company Order for the authentication and delivery of Notes, shall authenticate and deliver (x) in the case of clause (iii), a Physical Note to such beneficial owner in a principal amount equal to the principal amount of such Note corresponding to such beneficial owner’s beneficial interest and (y) in the case of clause (i) or (ii), Physical Notes to each beneficial owner of the related Global Notes (or a portion thereof) in an aggregate principal amount equal to the aggregate principal amount of such Global Notes in exchange for such Global Notes, and upon delivery of the Global Notes to the Paying Agent such Global Notes shall be canceled.

Physical Notes issued in exchange for all or a part of the Global Note pursuant to this Section 2.06(d) shall be registered in such names and in such authorized denominations as the

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Depositary, pursuant to instructions from its direct or indirect participants or otherwise, shall instruct the Note Registrar. Upon execution and authentication, the Agent shall deliver such Physical Notes to the Persons in whose names such Physical Notes are so registered.

At such time as all interests in a Global Note have been converted, canceled, repurchased or transferred, such Global Note shall be, upon receipt thereof, canceled by the Paying Agent in accordance with standing procedures and existing instructions between the Depositary and the Custodian. At any time prior to such cancellation, if any interest in a Global Note is exchanged for Physical Notes, converted, canceled, repurchased or transferred to a transferee who receives Physical Notes therefor or any Physical Note is exchanged or transferred for part of such Global Note, the principal amount of such Global Note shall, in accordance with standing procedures and existing instructions between the Depositary and the Custodian, be appropriately reduced or increased, as the case may be, and an endorsement shall be made on the Schedule of Exchanges of such Global Note, by the Transfer Agent or the Custodian, at the direction of the Paying Agent, to reflect such reduction or increase.

None of the Company, the Agent, the Trustee nor any agent of the Company, the Agent, or the Trustee shall have any responsibility or liability for any aspect of the records relating to or payments made on account of beneficial ownership interests of a Global Note or maintaining, supervising or reviewing any records relating to such beneficial ownership interests.

SECTION 2.07.                    Mutilated, Destroyed, Lost or Stolen Notes.  In case any Note shall become mutilated or be destroyed, lost or stolen, the Company in its discretion may execute, and upon its written request the Authenticating Agent shall authenticate and deliver, a new Note, bearing a number not contemporaneously outstanding, in exchange and substitution for the mutilated Note, or in lieu of and in substitution for the Note so destroyed, lost or stolen. In every case the applicant for a substituted Note shall furnish to the Company and the Agent such security or indemnity as may be required by them to save each of them harmless from any loss, liability, cost or expense caused by or connected with such substitution, and, in every case of destruction, loss or theft, the applicant shall also furnish to the Company, to the Agent and, if applicable, to such authenticating agent evidence to their satisfaction of the destruction, loss or theft of such Note and of the ownership thereof.

The Authenticating Agent may authenticate any such substituted Note and deliver the same upon the receipt of such security or indemnity as the Trustee, the Agent, and the Company may require. Upon the issuance of any substitute Note, the Company or the Agent may require the payment by the holder of a sum sufficient to cover any tax, assessment or other governmental charge that may be imposed in relation thereto and any other expenses connected therewith. In case any Note that has matured or is about to mature or has been tendered for repurchase upon a Fundamental Change or in connection with an optional redemption or is about to be converted into cash, shares of Common Stock or a combination of cash and shares of Common Stock, as applicable, shall become mutilated or be destroyed, lost or stolen, the Company may, in its sole discretion, instead of issuing a substitute Note, pay or authorize the payment of or convert or authorize the conversion of the same (without surrender thereof except in the case of a mutilated Note), as the case may be, if the

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applicant for such payment or conversion shall furnish to the Company, the Transfer Agent, the Paying Agent, the Conversion Agent, and, if applicable, to such authenticating agent such security or indemnity as may be required by them to save each of them harmless for any loss, liability, cost or expense caused by or connected with such substitution, including without limitation if a Note is replaced and subsequently presented or claimed for payment and, in every case of destruction, loss or theft, evidence satisfactory to the Company, the Transfer Agent, the Trustee and, if applicable, any Paying Agent or Conversion Agent evidence of their satisfaction of the destruction, loss or theft of such Note and of the ownership thereof.

Every substitute Note issued pursuant to the provisions of this Section 2.07 by virtue of the fact that any Note is destroyed, lost or stolen shall constitute an additional contractual obligation of the Company, whether or not the destroyed, lost or stolen Note shall be found at any time, and shall be entitled to all the benefits of (but shall be subject to all the limitations set forth in) this Indenture equally and proportionately with any and all other Notes duly issued hereunder. To the extent permitted by law, all Notes shall be held and owned upon the express condition that the foregoing provisions are exclusive with respect to the replacement or payment or conversion or repurchase of mutilated, destroyed, lost or stolen Notes and shall preclude any and all other rights or remedies notwithstanding any law or statute existing or hereafter enacted to the contrary with respect to the replacement or payment or conversion of negotiable instruments or other securities without their surrender.

SECTION 2.08.                    Temporary Notes.  Pending the preparation of Notes in certificated form, the Company may execute and the Authenticating Agent shall, upon written request of the Company, authenticate and deliver temporary Notes (printed or lithographed). Temporary Notes shall be issuable in any authorized denomination, and substantially in the form of the Notes in certificated form but with such omissions, insertions and variations as may be appropriate for temporary Notes, all as may be determined by the Company. Every such temporary Note shall be executed by the Company and authenticated by the Authenticating Agent upon the same conditions and in substantially the same manner, and with the same effect, as the Notes in certificated form. Without unreasonable delay the Company will execute and deliver to the Authenticating Agent Notes in certificated form (other than any Global Note) and thereupon any or all temporary Notes (other than any Global Note) may be surrendered in exchange therefor, at each office or agency maintained by the Company pursuant to Section 9.02 and the Authenticating Agent shall authenticate and deliver in exchange for such temporary Notes an equal aggregate principal amount of Notes in certificated form. Such exchange shall be made by the Company at its own expense and without any charge therefor. Until so exchanged, the temporary Notes shall in all respects be entitled to the same benefits and subject to the same limitations under this Indenture as Notes in certificated form authenticated and delivered hereunder.

SECTION 2.09.                    Cancellation of Notes Paid, Etc.  All Notes surrendered for the purpose of payment, repurchase, conversion, exchange or registration of transfer, shall, if surrendered to the Company or any Paying Agent or any Note Registrar or any Conversion Agent, be surrendered to the Trustee and promptly canceled by it, and no Notes shall be issued in lieu thereof except as expressly permitted by any of the provisions of this Indenture. The Trustee shall

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dispose of canceled Notes in accordance with its customary procedures. If the Company shall acquire any of the Notes, such acquisition shall not operate as satisfaction of the Indebtedness represented by such Notes unless and until the same are delivered to the Trustee for cancellation.

SECTION 2.10.                    CUSIP Numbers.  In issuing the Notes, the Company may use “CUSIP” numbers (if then generally in use), and, if so, the Trustee and/or any Agent shall use “CUSIP” numbers in notices issued to Holders of the Notes as a convenience to them; provided that any such notice may state that no representation is made as to the correctness of such numbers either as printed on the Notes or on such notice and that reliance may be placed only on the other identification numbers printed on the Notes. The Company will promptly notify the Trustee and all Agents in writing of any change in the “CUSIP” numbers.

SECTION 2.11.                    Repurchases.  Any Notes repurchased by the Company will be immediately retired and not be outstanding for any purpose under this Indenture.

ARTICLE 3

FUNDAMENTAL CHANGES AND PURCHASES THEREUPON

SECTION 3.01.                    Purchase at Option of Holders Upon a Fundamental Change.

(a)           Generally. If a Fundamental Change occurs at any time prior to June 15, 2020, then each Holder of Notes shall have the right, at such Holder’s option, to require the Company to purchase for cash any or all of such Holder’s Notes, or any portion of the principal amount thereof, that is equal to $1,000 or a multiple of $1,000, on a date specified by the Company that is no earlier than the 20th calendar day following the date of, and no later than the 35th calendar day following the date of, delivery of the Fundamental Change Company Notice (as defined below) (the “Fundamental Change Purchase Date”), at a purchase price equal to 100% of the principal amount thereof, together with accrued and unpaid interest thereon to, but excluding, the Fundamental Change Purchase Date (the “Fundamental Change Purchase Price”); provided, however, that if a Fundamental Change Purchase Date is after a Regular Record Date and on or prior to the Interest Payment Date to which such Regular Record Date relates, the interest payable in respect of such Interest Payment Date shall be payable to the Holders of record as of the corresponding Regular Record Date and the Fundamental Change Purchase Price shall be equal to 100% of the principal amount of the Notes to be purchased pursuant to this Article 3. Any Notes purchased by the Company will be paid for in cash. The requirement for the Company to purchase any Notes on the Fundamental Change Purchase Date will be subject to extension to comply with applicable law.

Purchases of Notes under this Section 3.01 shall be made, at the option of the Holder thereof, upon:

(i)            delivery to the Paying Agent by a Holder of a duly completed notice (the “Fundamental Change Purchase Notice”) in the form set forth on the reverse of the Note as Exhibit C thereto, if the Notes are Physical Notes, or in compliance with the Depositary’s procedures

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for tendering interests in Global Notes, if the Notes are not Physical Notes, in each case prior to the close of business on the Business Day immediately preceding the Fundamental Change Purchase Date; and

(ii)           delivery of the Notes, in the case of Physical Notes, to the Paying Agent appointed by the Company (together with all necessary endorsements for transfer), or book-entry transfer of the Notes, in compliance with the procedures of the Depositary, such delivery or transfer being a condition to receipt by the Holder of the Fundamental Change Purchase Price therefor; provided, however, that the Company shall have no obligation to deliver a Fundamental Change Company Notice or to purchase Notes pursuant to this Article 3 if:

(A)          a third party delivers such notice and makes a fundamental change purchase offer (a “Fundamental Change Purchase Offer”) in the manner, at the times and otherwise in compliance with the requirements set forth in this Article 3 applicable to a Fundamental Change Purchase Offer made by the Company and purchases all Notes properly tendered and not withdrawn under the fundamental change purchase offer;

(B)          prior to or simultaneously with the Fundamental Change a Redemption Notice has been given pursuant to Article 15 hereof (unless and until there is a default in the payment of the applicable Redemption Price); or

(C)          if the Company’s obligations under this Indenture are discharged as described under Section 13.01 hereof on or promptly following the Fundamental Change.

The Fundamental Change Purchase Notice in respect of any Notes to be purchased shall state:

(i)            if such Notes are Physical Notes, the certificate numbers of such Notes, or if such Notes are in global form, the Fundamental Change Purchase Notice must also comply with appropriate procedures of the Depositary;

(ii)           the portion of the principal amount of such Notes to be purchased, which must be $1,000 or a multiple thereof; and

(iii)          that such Notes are to be purchased by the Company pursuant to the applicable provisions of the Notes and this Indenture.

A Fundamental Change Purchase Offer may be made in advance of a Fundamental Change and may be conditional upon the occurrence of a Fundamental Change if a definitive agreement is in place for the Fundamental Change at the time the Fundamental Change Purchase Offer is made.

Notwithstanding anything herein to the contrary, any Holder delivering to the Paying Agent the Fundamental Change Purchase Notice contemplated by this Section 3.01 shall have the right to withdraw, in whole or in part, such Fundamental Change Purchase Notice at any time prior to the

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close of business on the Business Day immediately preceding the Fundamental Change Purchase Date by delivery of a written notice of withdrawal to the Paying Agent in accordance with Section 3.03 below.

The Paying Agent shall promptly notify the Company of the receipt by it of any Fundamental Change Purchase Notice or written notice of withdrawal thereof.

(b)           Fundamental Change Company Notice. On or before the 20th calendar day after the occurrence of a Fundamental Change, the Company shall provide to all Holders of the Notes, the Trustee and the Paying Agent (in the case of any Paying Agent other than the Trustee) a notice (the “Fundamental Change Company Notice”) of the occurrence of such Fundamental Change and of the purchase right at the option of the Holders arising as a result thereof. Such notice shall be sent by first class mail or, in the case of any Global Notes, in accordance with the procedures of the Depositary for providing notices. Simultaneously with providing such Fundamental Change Company Notice, the Company shall issue a press release and publish a notice containing the information included therein or shall publish such information on the Company’s website or through such other public medium as the Company may use at such time.

Each Fundamental Change Company Notice shall specify:

(i)    the events causing a Fundamental Change;

(ii)   the date of the Fundamental Change;

(iii)  the last date on which a Holder of Notes may exercise the repurchase right pursuant to this Article 3;

(iv)  the Fundamental Change Purchase Price;

(v)   the Fundamental Change Purchase Date;

(vi)  the name and address of the Paying Agent and the Conversion Agent, if applicable;

(vii) if applicable, the applicable Conversion Rate and any adjustments to the applicable Conversion Rate;

(viii) if applicable, that the Notes with respect to which a Fundamental Change Purchase Notice has been delivered by a Holder may be converted only if the Holder withdraws the Fundamental Change Purchase Notice in accordance with the Indenture; and

(ix)  the procedures that Holders must follow to require the Company to purchase their Notes.

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No failure of the Company to give the foregoing notices and no defect therein shall limit the purchase rights of the Holders of Notes or affect the validity of the proceedings for the purchase of the Notes pursuant to this Section 3.01.

(c)           No Payment During Events of Default. There shall be no purchase of any Notes pursuant to this Section 3.01 if there has occurred and is continuing an Event of Default with respect to the Notes (other than an Event of Default that is cured by the payment of the Fundamental Change Purchase Price of the Notes). The Paying Agent will promptly return to the respective Holders thereof any Physical Notes held by it during the continuance of an Event of Default (other than an Event of Default that is cured by the payment of the Fundamental Change Purchase Price with respect to the Notes) and shall deem canceled any instructions for book-entry transfer of the Notes in compliance with the procedures of the Depositary, in which case, upon such return and cancellation, the Fundamental Change Purchase Notice with respect thereto shall be deemed to have been withdrawn.

SECTION 3.02.                    Effect of Fundamental Change Purchase Notice.  Upon receipt by the Paying Agent of the Fundamental Change Purchase Notice specified in Section 3.01 hereof, the Holder of the Note in respect of which such Fundamental Change Purchase Notice was given shall (unless such Fundamental Change Purchase Notice is withdrawn in accordance with Section 3.03 hereof) thereafter be entitled to receive solely the Fundamental Change Purchase Price in cash with respect to such Note. Such Fundamental Change Purchase Price shall be paid to such Holder, subject to receipt of funds by the Paying Agent, on the later of (x) the Fundamental Change Purchase Date with respect to such Note (provided the conditions in Section 3.01 hereof have been satisfied) and (y) the time of delivery or book-entry transfer of such Note to the Paying Agent by the Holder thereof in the manner required by Section 3.01 hereof.

SECTION 3.03.                    Withdrawal of Fundamental Change Purchase Notice.  A Fundamental Change Purchase Notice may be withdrawn (in whole or in part) by means of a written notice of withdrawal delivered to the Paying Agent in accordance with the Fundamental Change Company Notice at any time prior to the close of business on the date that is at least two Business Days prior to the Fundamental Change Purchase Date, specifying:

(i)    the principal amount of the Notes with respect to which such notice of withdrawal is being submitted;

(ii)   if Physical Notes have been issued, the certificate numbers of the withdrawn Notes, or if Physical Notes have not been issued, the notice must comply with appropriate procedures of the Depositary; and

(iii)  the principal amount, if any, of such Notes that remains subject to the original Fundamental Change Purchase Notice, which portion must be in principal amounts of $1,000 or a multiple of $1,000.

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The Paying Agent will promptly return to the respective Holders thereof any Physical Notes with respect to which a Fundamental Change Purchase Notice has been withdrawn in compliance with the provisions of this Section 3.03.

SECTION 3.04.                    Deposit of Fundamental Change Purchase Price.  Prior to 10:00 a.m. (local time in The City of New York) on the Fundamental Change Purchase Date, the Company shall deposit with the Paying Agent (or, if the Company or a Subsidiary or an Affiliate of either of them is acting as the Paying Agent, shall segregate and hold in trust as provided herein) an amount of money (in immediately available funds if deposited on such Business Day) sufficient to pay the Fundamental Change Purchase Price of all the Notes or portions thereof that are to be purchased as of the Fundamental Change Purchase Date. If the Paying Agent holds cash sufficient to pay the Fundamental Change Purchase Price of the Notes for which a Fundamental Change Purchase Notice has been tendered and not withdrawn in accordance with this Indenture on the Fundamental Change Purchase Date, then as of such Fundamental Change Purchase Date, (a) such Notes will cease to be outstanding and interest will cease to accrue thereon (whether or not book-entry transfer of such Notes is made or such Notes have been delivered to the Paying Agent) and (b) all other rights of the Holders in respect thereof will terminate (other than the right to receive the Fundamental Change Purchase Price and previously accrued and unpaid interest upon delivery or book-entry transfer of such Notes).

SECTION 3.05.                    Notes Purchased in Whole or in Part.  Any Note that is to be purchased, whether in whole or in part, shall be surrendered at the office of the Paying Agent (with, if the Company or the Trustee so requires in the case of Physical Notes, due endorsement by, or a written instrument of transfer in form satisfactory to the Company and the Trustee duly executed by, the Holder thereof or such Holder’s attorney duly authorized in writing) and the Company shall execute and the Authenticating Agent shall authenticate and deliver to the Holder of such Note, without service charge, a new Note or Notes, of any authorized denomination as requested by such Holder in aggregate principal amount equal to, and in exchange for, the portion of the principal amount of the Note so surrendered that is not purchased.

SECTION 3.06.                    Covenant to Comply With Applicable Laws Upon Purchase of Notes.  In connection with any offer to purchase Notes under Section 3.01 hereof, the Company shall, in each case if required, (i) comply with Rule 13e-4, Rule 14e-1 and any other tender offer rules under the Exchange Act that may then be applicable, (ii) file a Schedule TO or any other required schedule under the Exchange Act and (iii) otherwise comply with all federal and state securities laws so as to permit the rights and obligations under Section 3.01 to be exercised in the time and in the manner specified in Section 3.01, and shall not be deemed to have breached its obligations under the Indenture by virtue of its compliance with such securities laws or regulations.

SECTION 3.07.                    Repayment to the Company.  To the extent that the aggregate amount of cash deposited by the Company pursuant to Section 3.04 exceeds the aggregate Fundamental Change Purchase Price of the Notes or portions thereof that the Company is obligated to purchase as of the Fundamental Change Purchase Date, then, following the Fundamental Change Purchase Date, the Paying Agent shall promptly return any such excess to the Company.

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ARTICLE 4
CONVERSION

SECTION 4.01.                    Right to Convert.

(a)           Subject to and upon compliance with the provisions of this Indenture, each Holder of Notes shall have the right, at such Holder’s option, to convert the principal amount of any such Notes, or any portion of such principal amount equal to $1,000 or a multiple of $1,000 thereof, at the Conversion Rate in effect on the Conversion Date for such Notes, (x) prior to December 15, 2019, only upon satisfaction of one or more of the conditions described in clauses (i) through (v) below and (y) on or after December 15, 2019, at any time prior to the close of business on the second Scheduled Trading Day immediately preceding June 15, 2020 irrespective of the conditions described in clauses (i) through (v) below:

(i)            Prior to December 15, 2019, a Holder of Notes may surrender all or a portion of its Notes for conversion during any calendar quarter (and only during such calendar quarter) commencing after September 30, 2015, if the Last Reported Sale Price of the Common Stock for at least 20 Trading Days (whether or not consecutive) during the period of 30 consecutive Trading Days ending on the last Trading Day of the immediately preceding calendar quarter is greater than or equal to 130% of the applicable Conversion Price in effect on each applicable Trading Day as determined by the Company. The Company shall notify the Trustee and the Conversion Agent if the Notes become convertible in accordance with this Section 4.01(a)(i).

(ii)           Prior to December 15, 2019, a Holder of Notes may surrender its Notes for conversion during the five Business Day period after any five consecutive Trading Day period in which the Trading Price per $1,000 principal amount of Notes, as determined following a request by a Holder of Notes in accordance with the procedures set forth in this Section 4.01(a)(ii), for each Trading Day of such period was less than 98% of the product of the Last Reported Sale Price of the Common Stock and the Conversion Rate on such Conversion Date (the “Trading Price Condition”). The Bid Solicitation Agent shall have no obligation to determine the Trading Price of the Notes in accordance with this Section 4.01(a)(ii) unless requested by the Company, and the Company shall have no obligation to make such request unless a Holder of Notes provides the Company with reasonable evidence that the Trading Price per $1,000 principal amount of Notes would be less than 98% of the product of the Last Reported Sale Price of the Common Stock and the applicable Conversion Rate. The Company shall instruct the Bid Solicitation Agent to determine (or, if the Company is then acting as Bid Solicitation Agent, the Company shall determine) the Trading Price of the Notes beginning on the next Trading Day promptly following the receipt of such evidence and on each successive Trading Day until such Trading Day on which the Trading Price per $1,000 principal amount of Notes is greater than or equal to 98% of the product of the Last Reported Sale Price of the Common Stock and the applicable Conversion Rate. If the Company does not so instruct the Bid Solicitation Agent to obtain (or, if the Company is then acting as Bid Solicitation Agent, the Company does not obtain) bids when required or (if the Bid Solicitation Agent is not the Company) the Company so instructs the Bid Solicitation Agent and the Bid Solicitation Agent fails to make such determination, the Trading Price per $1,000 principal amount

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of the Notes shall be deemed to be less than 98% of the product of the Last Reported Sale Price of the Common Stock and the applicable Conversion Rate on each day the Company or Bid Solicitation Agent, as applicable, fails to do so. If the Trading Price Condition has been met, the Company shall so notify Holders, the Trustee and the Conversion Agent. If, at any time after the Trading Price Condition has been met, the Trading Price per $1,000 principal amount of Notes is greater than or equal to 98% of the product of the Last Reported Sale Price of the Common Stock and the Conversion Rate for such date, the Company shall so notify Holders, the Trustee and the Conversion Agent.

(iii)          If the Company elects to:

(A)          issue to all or substantially all holders of Common Stock rights or warrants entitling them for a period of not more than 45 calendar days after the date of such issuance to subscribe for or purchase shares of Common Stock at a price per share less than the average of the Last Reported Sale Prices of a share of Common Stock for the 10 consecutive Trading Day period ending on the Trading Day immediately preceding the date of announcement of such issuance; or

(B)          distribute to all or substantially all holders of Common Stock assets, debt securities or rights to purchase securities of the Company, which distribution has a per share value, as reasonably determined by the Board of Directors, exceeding 10% of the Last Reported Sale Price of the Common Stock on the Trading Day preceding the date of announcement for such distribution, then, in each case, the Company shall notify the Holders of the Notes at least 45 Scheduled Trading Days prior to the Ex-Dividend Date for such issuance or distribution. Once the Company has given such notice, Holders may surrender Notes for conversion at any time until the earlier of the close of business on the Business Day immediately prior to such Ex-Dividend Date or the Company’s announcement that such issuance or distribution will not take place, even if the Notes are not otherwise convertible at such time.

(iv)          If a transaction or event that constitutes a Fundamental Change or a Make-Whole Fundamental Change occurs, regardless of whether a Holder has the right to require the Company to purchase the Notes pursuant to Article 3 hereof, or if the Company is a party to a consolidation, merger, binding share exchange, or sale, transfer or lease of all or substantially all of the Company’s assets, in each case, pursuant to which the Common Stock would be converted into cash, securities or other assets, Holders may surrender Notes for conversion at any time from or after the date which is 25 Scheduled Trading Days prior to the anticipated effective date of such transaction until 35 Trading Days after the actual effective date of such transaction (or, if such transaction also constitutes a Fundamental Change, until the related Fundamental Change Purchase Date). The Company shall notify Holders, the Conversion Agent (if other than the Trustee) and the Trustee as promptly as practicable following the date the Company publicly announces such transaction, but in no event (1) less than 25 Scheduled Trading Days prior to the anticipated effective date of such transaction in the case of transactions to which the Company is a party or (2) later than

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one Business Day after becoming aware of such transaction in the case of transactions to which the Company is not a party.

(v)           If, at any time after June 20, 2018, the Company calls any or all of the Notes for redemption as described under Article 15 hereof, Holders of the Notes will have the right to convert their Notes at any time until the close of business on the Business Day immediately preceding the Redemption Date, after which time Holders will no longer have the right to convert their Notes on account of the Company’s delivery of notice of such redemption, unless the Company defaults in the payment of the Redemption Price. If a Holder elects to convert its Notes in connection with a Redemption Notice issued by the Company, the Company shall:

(A)          increase the conversion rate for the Notes as described under Section 4.06 hereof; and

(B)          pay to such Holder an amount equal to accrued and unpaid interest (including additional amounts, if any) on the Notes that are surrendered for conversion to, but excluding, the conversion date; provided that if such conversion date occurs after a record date and on or prior to the corresponding Interest Payment Date, the Company shall pay the interest due (including Additional Interest, if any) on that Interest Payment Date to the Holder of record on the relevant record date and no additional payment will be made pursuant to this clause.

Failure by the Company to give any notice required by Section 4.01, or any defect therein, shall not affect the legality or validity of the relevant transaction or event.

(b)           Notes may not be converted after the close of business on the second Scheduled Trading Day immediately preceding the Stated Maturity.

SECTION 4.02.                    Conversion Procedures.

(a)           Each Note shall be convertible at the office of the Conversion Agent and, if applicable, in accordance with the procedures of the Depositary.

(b)           In order to exercise the conversion privilege with respect to any interest in a Global Note, the Holder must comply with the Depositary’s procedures for converting a beneficial interest in a Global Note and, if required, pay the funds required by Section 4.03(e) and pay any taxes or duties if required pursuant to Section 4.08, and the Conversion Agent must be informed of the conversion in accordance with the customary practice of the Depositary. In order to exercise the conversion privilege with respect to any Physical Notes, the Holder of any such Notes to be converted, in whole or in part, shall:

(i)            complete and manually sign the conversion notice provided on the back of the Note (the “Conversion Notice”) or a facsimile of the Conversion Notice;

(ii)           deliver the Conversion Notice, which is irrevocable, and the Note to the Conversion Agent;

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(iii)          if required, furnish appropriate endorsements and transfer documents,

(iv)          make any payment required under Section 4.03(e); and

(v)           if required, pay all transfer or similar taxes as set forth in Section 4.08.

The date on which the Holder satisfies all of the applicable requirements set forth above is the “Conversion Date.” The Conversion Agent will, as promptly as possible, and in any event within two Business Days of the receipt thereof, provide the Company and the Trustee with notice of any conversion by a Holder of the Notes.

(c)           Each Conversion Notice shall state the name or names (with address or addresses) in which any certificate or certificates for shares of Common Stock which shall be issuable on such conversion shall be issued. All such Notes surrendered for conversion shall, unless the shares issuable on conversion are to be issued in the same name as the registration of such Notes, be duly endorsed by, or be accompanied by instruments of transfer in form satisfactory to the Company duly executed by, the Holder or his duly authorized attorney.

(d)           In case any Notes of a denomination greater than $1,000 shall be surrendered for partial conversion, the Company shall execute and the Authenticating Agent shall authenticate and deliver to the Holder of the Notes so surrendered, without charge, new Notes in authorized denominations in an aggregate principal amount equal to the unconverted portion of the surrendered Notes.

(e)           Each conversion shall be deemed to have been effected as to any Notes (or portion thereof) surrendered for conversion on the relevant Conversion Date, and with respect to any shares of Common Stock that are issuable upon such conversion: (i) if such conversion was subject to a Physical Settlement, the Person in whose name the certificate or certificates for such shares of Common Stock will be registered, shall become the holder of record of such shares as of the close of business on the Conversion Date; and (ii) if such conversion was subject to a Combination Settlement, the Person in whose name the certificate or certificates for such shares of Common Stock will be registered, shall become the holder of record of such shares as of the close of business on the last Trading Day of the related Observation Period.

(f)            Upon the conversion of an interest in Global Notes, the Conversion Agent (or other Conversion Agent appointed by the Company) shall make a notation on such Global Notes as to the reduction in the principal amount represented thereby. The Company shall notify the Trustee in writing of any conversions of Notes effected through any Conversion Agent other than the Trustee.

(g)           Notwithstanding the foregoing, a Note in respect of which a Holder has delivered a Fundamental Change Purchase Notice exercising such Holder’s option to require the Company to purchase such Note may be converted only if such notice of exercise is withdrawn in accordance with Article 3 hereof prior to the close of business on the Business Day prior to the relevant Fundamental Change Purchase Date.

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SECTION 4.03.                    Settlement Upon Conversion.

(a)           Except as provided in Section 4.06(b), upon any conversion of any Note, the Company shall deliver to converting Holders, in respect of each $1,000 principal amount of Notes being converted, at the Company’s election, in full satisfaction of the Company’s Conversion Obligation, (1) shares of Common Stock, together with cash in lieu of fractional shares, if any (a “Physical Settlement”), (2) a cash payment without any delivery of shares of Common Stock (a “Cash Settlement”) or (3) a combination of cash and shares of Common Stock, together with cash in lieu of fractional shares, if any (a “Combination Settlement”), in each case, as set forth below (the amounts so deliverable upon conversion of the Notes, the “Conversion Obligation”):

For conversions:

(i)            that occur prior to December 15, 2019, by the close of business on the Business Day following the Conversion Date, the Company shall notify converting Holders of the relevant Settlement Method and, if the Company elects a Combination Settlement, the dollar amount of the conversion obligation (the “Cash Amount”) that will be settled in cash;

(ii)           that occur on or after December 15, 2019, the Company shall notify all Holders of the relevant Settlement Method and, if applicable, the related Cash Amount, by notice on or prior to December 15, 2019.

All conversions for which the relevant Conversion Date occurs during the period from, and including, December 15, 2019 to the close of business on the second Scheduled Trading Day immediately preceding the Stated Maturity will be settled using the same Settlement Method. Except for any conversions described in the preceding sentence, the Company shall use the same Settlement Method for all conversions occurring on the same Conversion Date, but will not have any obligation to use the same Settlement Method with respect to conversions that occur on different Conversion Dates.

If the Company does not specify a Settlement Method as set forth above, then Combination Settlement shall apply, and the related Cash Amount used in the settlement calculation set forth in paragraph (d) below will be $1,000. Any such notice of a Settlement Method may not be revoked.

(b)           If the Company has elected a Physical Settlement with respect to any Notes tendered for conversion, the Company shall deliver, for each $1,000 principal amount of Notes, a number of shares of Common Stock equal to the Conversion Rate, together with cash in lieu of fractional shares. Except for conversions upon a Make-Whole Fundamental Change as provided in Section 4.06, the Company shall deliver such shares of Common Stock on the third Business Day following the Conversion Date.

(c)           If the Company has elected a Cash Settlement with respect to any Notes tendered for conversion, the Company shall deliver, for each $1,000 principal amount of Notes, a cash payment equal to the sum of the Daily Conversion Values for each of the twenty (20) consecutive Trading Days during the relevant Observation Period. Except for conversions upon a

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Make-Whole Fundamental Change as provided in Section 4.06, the Company shall make such payment on the third Business Day following the last day of the applicable Observation Period.

(d)           If the Company has elected or is deemed to have elected a Combination Settlement with respect to any Notes tendered for conversion, the Company shall deliver, for each $1,000 principal amount of Notes, the sum of the Daily Settlement Amounts for each of the twenty (20) consecutive Trading Days during the relevant Observation Period.

The “Daily Settlement Amount” for each of the twenty (20) consecutive Trading Days during the Observation Period shall consist of:

(i)            cash in an amount equal to the lesser of (i) 5% of the cash amount specified by the Company in the notice regarding the chosen Settlement Method (the “Daily Cash Amount”) and (ii) the Daily Conversion Value on such Trading Day; and

(ii)           if the Daily Conversion Value on such Trading Day exceeds the Daily Cash Amount, a number of shares of Common Stock (together with cash in lieu of any fractional shares) equal to (i) the difference between such Daily Conversion Value and the Daily Cash Amount, divided by (ii) the Daily VWAP on such Trading Day.

Except for conversions upon a Make-Whole Fundamental Change as provided in Section 4.06, the Company shall deliver such cash and shares of Common Stock on the third Business Day following the last day of the applicable Observation Period.

(e)           Upon conversion of any Notes, Holders shall not receive any separate cash payment for accrued and unpaid interest, except to the extent specified below. The Company’s delivery to the Holder of Common Stock, cash or a combination of cash and Common Stock, as applicable, together with any cash payment for any fractional share of Common Stock, into which a Note is convertible shall be deemed to satisfy in full the Company’s obligation to pay (i) the principal amount of the Notes so converted and (ii) accrued and unpaid interest (including Additional Interest, if any), to, but not including, the Conversion Date. As a result, accrued and unpaid interest (including Additional Interest, if any) to, but not including, the Conversion Date shall be deemed to be paid in full rather than cancelled, extinguished or forfeited. Notes surrendered for conversion during the period from the close of business on any Regular Record Date to the open of business on the immediately following Interest Payment Date must be accompanied by funds equal to the amount of interest (including Additional Interest, if any) payable on the Notes so converted; provided that no such payment need be made (i) for conversions following the Regular Record Date immediately preceding June 15, 2020, (ii) if the Company has specified a Fundamental Change Purchase Date that is after a Regular Record Date and on or prior to the corresponding Interest Payment Date, (iii) if the Company has specified a date for redemption of Notes that is after a Regular Record Date and on or prior to the corresponding Interest Payment Date, or (iv) to the extent of any overdue interest, if any overdue interest exists at the time of conversion with respect to such Note.

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(f)            The Company shall not issue fractional shares of Common Stock upon conversion of Notes. If multiple Notes shall be surrendered for conversion at one time by the same Holder, the number of full shares of Common Stock which shall be issuable upon conversion shall be computed on the basis of the aggregate principal amount of the Notes (or specified portions thereof to the extent permitted hereby) so surrendered. If any fractional share of Common Stock would be issuable upon the conversion of any Notes, the Company shall make payment therefor in cash in lieu of fractional shares of Common Stock based on:

(i)            if Physical Settlement applies, on the Last Reported Sale Price of the Common Stock on the relevant Conversion Date, and

(ii)           if any other Settlement Method applies, the Daily VWAP of the Common Stock on the final Trading Day of the applicable Observation Period.

(g)           Solely for purposes of determining the payments and deliveries due upon conversion under this Section 4.03, and notwithstanding the definition of “Trading Day” contained in Section 1.02, “Trading Day” means a day on which (i) there is no Market Disruption Event and (ii) trading in the Common Stock generally occurs on The NASDAQ Global Market or, if the Common Stock is not then listed on The NASDAQ Global Market, on the principal other United States national or regional securities exchange on which the Common Stock is then listed or, if the Common Stock is not then listed on a United States national or regional securities exchange, on the principal other market on which the Common Stock is then traded. If the Common Stock (or other security for which a Daily VWAP must be determined) is not so listed or traded, “Trading Day” means a Business Day.

(h)           Upon surrender of Notes for conversion in connection with a Make-Whole Fundamental Change or Redemption Notice, the Company shall deliver shares of Common Stock, cash or a combination of cash and shares of Common Stock, as set forth above, at the increased Conversion Rate as described in Section 4.06.

SECTION 4.04.                    Adjustment of Conversion Rate.  The Conversion Rate shall be adjusted from time to time by the Company if any of the following events occurs, except that the Company will not make any adjustment to the Conversion Rate if Holders of Notes participate, as a result of holding the Notes, in any of the transactions described under Section 4.04(a) (but only with respect to stock dividends or distributions), Section 4.04(b), Section 4.04(c), and Section 4.04(d), at the same time as holders of the Common Stock participate, without having to convert their Notes, as if such Holders held a number of shares of Common Stock equal to the Conversion Rate in effect for each $1,000 principal amount of such Notes immediately prior to the Ex-Dividend Date for such event.

(a)           If the Company, at any time or from time to time while any of the Notes are outstanding, exclusively issues shares of its Common Stock as a dividend or distribution on shares of Common Stock, or if the Company effects a share split or share combination, then the Conversion Rate shall be adjusted based on the following formula:

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where

CR0  =                                                            The Conversion Rate in effect immediately prior to the open of business on the Ex-Dividend Date of such dividend or distribution, or immediately prior to the open of business on the effective date of such share split or share combination, as applicable;

CR1  =                                                            The Conversion Rate in effect immediately after the open of business on such Ex-Dividend Date or such effective date;

OS0  =                                                              The number of shares of Common Stock outstanding immediately prior to the open of business on such Ex-Dividend Date or such effective date; and

OS1  =                                                              The number of shares of Common Stock outstanding immediately after giving effect to such dividend, distribution, share split or share combination.

Such adjustment shall become effective immediately after the open of business on the Ex-Dividend Date for such dividend or distribution or the effective date for such share split or share combination. If any dividend or distribution of the type described in this Section 4.04(a) is declared but not so paid or made, the Conversion Rate shall be immediately readjusted, effective as of the date the Company’s Board of Directors determines not to pay such dividend or distribution, to the Conversion Rate which would then be in effect if such dividend or distribution had not been declared.

(b)           If the Company, at any time or from time to time while any of the Notes are outstanding, issues to all or substantially all holders of the Common Stock any rights or warrants entitling them for a period of not more than 45 calendar days after date of such issuance to subscribe for or purchase shares of the Common Stock at a price per share less than the average of the Last Reported Sale Prices of the Common Stock for the 10 consecutive Trading Day period ending on the Trading Day immediately preceding the Ex-Dividend Date for such issuance, the Conversion Rate shall be adjusted based on the following formula (provided that the Conversion Rate will be readjusted to the extent that such rights or warrants are not exercised prior to their expiration to the Conversion Rate that would be in effect had the adjustment been made on the basis of delivery of only the number of shares of Common Stock actually delivered):

where

CR0  =                                                            The Conversion Rate in effect immediately prior to the open of business on the Ex-Dividend Date for such issuance;

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CR1  =                                                            The Conversion Rate in effect immediately after the open of business on such Ex-Dividend Date;

OS0 =                                                                 The number of shares of Common Stock outstanding immediately prior to the open of business on such Ex-Dividend Date;

X =                                                                             The total number of shares of Common Stock issuable pursuant to such rights or warrants; and

Y =                                                                             The number of shares of Common Stock equal to the aggregate price payable to exercise such rights or warrants divided by the average of the Last Reported Sale Prices of the Common Stock over the 10 consecutive Trading Day period ending on the Trading Day immediately preceding the date of announcement of the issuance of such rights or warrants.

Such adjustment will be made under this Section 4.04(b) successively whenever any such rights, options or warrants are issued and shall become effective immediately after the open of business on the Ex-Dividend Date for Common Stock for such issuance. To the extent that shares of Common Stock are not delivered after the expiration of such rights, options or warrants, the Conversion Rate shall be decreased to the Conversion Rate which would then be in effect had the increase with respect to the issuance of such rights, options or warrants been made on the basis of delivery of only the number of shares of Common Stock actually delivered. In the event that such rights, options or warrants are not so issued, the Conversion Rate shall be decreased to the Conversion Rate that would then be in effect if the Ex-Dividend Date for Common Stock for such issuance had not occurred. For the purposes of this Section 4.04(b), in determining whether any rights, options or warrants entitle the holders to subscribe for or purchase shares of Common Stock at less than the average of the Last Reported Sale Prices of Common Stock for the 10 consecutive Trading Day period ending on, and including, the Trading Day immediately preceding the Ex-Dividend Date for such issuance, and in determining the aggregate offering price of such, there shall be taken into account any consideration received by the Company for such rights, options or warrants and any amount payable on exercise or conversion thereof, the value of such consideration, if other than cash, to be determined by the Board of Directors.

(c)           If the Company, at any time or from time to time while the Notes are outstanding, distributes shares of any class of capital stock of the Company, evidences of its indebtedness, other assets or property of the Company or rights or warrants to acquire the Company’s capital stock or other securities to all or substantially all holders of its Common Stock, excluding:

(i)            dividends or distributions and rights or warrants as to which an adjustment was effected pursuant to Section 4.04(a) or Section 4.04(b);

(ii)           dividends or distributions paid exclusively in cash (as set forth below in Section 4.04(d)); and

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(iii)          Spin-Offs to which the provisions set forth below in this Section 4.04(c) shall apply; then the Conversion Rate shall be adjusted based on the following formula:

CR0 =                                                               the Conversion Rate in effect immediately prior to the open of business on the Ex-Dividend Date for such distribution;

CR1 =                                                               the Conversion Rate in effect immediately after the open of business on such Ex-Dividend Date;

SP0 =                                                                   the average of the Last Reported Sale Prices of the Common Stock over the 10 consecutive Trading Day period ending on the Trading Day immediately preceding the Ex-Dividend Date for such distribution; and

FMV =                                                          the fair market value (as determined by the Board of Directors) of the shares of capital stock, evidences of indebtedness, assets, property, rights or warrants distributed with respect to each outstanding share of the Common Stock on the Ex-Dividend Date for such distribution

Such adjustment shall become effective immediately after the open of business on the Ex-Dividend Date for such distribution. If the Board of Directors determines the “FMV” (as defined above) of any distribution for purposes of this Section 4.04(c) by reference to the actual or when issued trading market for any securities, it must in doing so consider the prices in such market over the same period used in computing the average of the Last Reported Sale Prices of the Common Stock. Notwithstanding the foregoing, if “FMV” (as defined above) is equal to or greater than “SP0” (as defined above), in lieu of the foregoing adjustment, each Holder of Notes shall receive, at the same time and upon the same terms as holders of the Common Stock, the amount and kind of securities, assets and property such Holder would have received as if such Holder owned a number of shares of Common Stock equal to, for each $1,000 principal amount of Notes, the Conversion Rate in effect on the record date for the distribution of the securities, assets or property.

With respect to an adjustment pursuant to this Section 4.04(c) where there has been a payment of a dividend or other distribution on the Common Stock of shares of capital stock of any class or series, or similar equity interest, of or relating to a Subsidiary or other business unit and such dividend or distribution is listed for trading on a securities exchange (a “Spin-Off”), the Conversion Rate shall be increased based on the following formula:

where

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CR0 =                                                               the Conversion Rate in effect immediately prior to the end of the Valuation Period (as defined below);

CR1 =                                                               the Conversion Rate in effect immediately after the end of the Valuation Period;

FMV0 =                                                     the average of the Last Reported Sale Prices of the capital stock or similar equity interest distributed to holders of Common Stock applicable to one share of Common Stock (determined for purposes of the definition of Last Reported Sale Price as if such capital stock or similar equity interest were the Common Stock) over the first 10 consecutive Trading Day period after, and including, the Ex-Dividend Date of the Spin-Off (the “Valuation Period”); and

MP0 =                                                              the average of the Last Reported Sale Prices of Common Stock over the Valuation Period.

The adjustment to the Conversion Rate under the preceding paragraph will occur on the last day of the Valuation Period; provided that in respect of any conversion during the Valuation Period, references above to 10 Trading Days shall be deemed replaced with such lesser number of Trading Days as have elapsed between the Ex-Dividend Date of such Spin-Off and the Conversion Date in determining the applicable Conversion Rate.

For the purposes of this Section 4.04(c) (and subject in all respects to Section 4.12), rights or warrants distributed by the Company to all holders of its Common Stock entitling them to subscribe for or purchase shares of the Company’s capital stock (either initially or under certain circumstances), which rights or warrants, until the occurrence of a specified event or events (a “Trigger Event”): (1) are deemed to be transferred with such shares of Common Stock; (2) are not exercisable; and (3) are also issued in respect of future issuances of Common Stock, shall be deemed not to have been distributed for purposes of this Section 4.04(c), (and no adjustment to the Conversion Rate under this Section 4.04(c) will be required) until the occurrence of the earliest Trigger Event, whereupon such rights and warrants shall be deemed to have been distributed and an appropriate adjustment (if any is required) to the Conversion Rate shall be made under this Section 4.04(c). If any such right or warrant, including any such existing rights or warrants distributed prior to the date of this Indenture, are subject to events, upon the occurrence of which such rights or warrants become exercisable to purchase different securities, evidences of indebtedness or other assets, then the date of the occurrence of any and each such event shall be deemed to be the date of distribution and Ex-Dividend Date of such deemed distribution (in which case the original rights or warrants shall be deemed to terminate and expire on such date without exercise by any of the holders). In addition, in the event of any distribution or deemed distribution of rights or warrants, or any Trigger Event or other event (of the type described in the preceding sentence) with respect thereto that was counted for purposes of calculating a distribution amount for which an adjustment to the Conversion Rate under this Section 4.04(c) was made, (1) in the case of any such rights or warrants which shall all have been redeemed or purchased without exercise by any Holders thereof, upon such final redemption or repurchase (x) the Conversion Rate shall be readjusted as if such rights or warrants had not been issued and (y) the Conversion Rate shall then again be readjusted to give effect to such distribution, deemed distribution or Trigger Event, as the

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case may be, as though it were a cash distribution, equal to the per share redemption or purchase price received by holders of Common Stock with respect to such rights or warrants (assuming each such holder had retained such rights or warrants), made to all holders of Common Stock as of the date of such redemption or purchase, and (2) in the case of such rights or warrants which shall have expired or been terminated without exercise by any holders thereof, the Conversion Rate shall be readjusted as if such rights and warrants had not been issued.

For the purposes of this Section 4.04(c) and subsections (a) and (b) of this Section 4.04, any dividend or distribution to which this Section 4.04(c) applies which also includes one or both of:

(A)          a dividend or distribution of shares of Common Stock to which Section 4.04(a) applies (the “Clause A Distribution”); and

(B)          a dividend or distribution of rights or warrants to which Section 4.04(b) applies (the “Clause B Distribution”), then (1) such dividend or distribution, other than the Clause A Distribution and the Clause B Distribution, shall be deemed to be a dividend or distribution to which this Section 4.04(c) applies (the “Clause C Distribution”) and any Conversion Rate adjustment required by this Section 4.04(c) with respect thereto shall then be made, and (2) the Clause A Distribution and Clause B Distribution shall be deemed to immediately follow the Clause C Distribution and any Conversion Rate adjustment required by Section 4.04(a) and Section 4.04(b) with respect thereto shall then be made, except that, if determined by the Company, (I) the “Ex-Dividend Date” of the Clause A Distribution and the Clause B Distribution shall be deemed to be the Ex-Dividend Date of the Clause C Distribution and (II) any shares of Common Stock included in the Clause A Distribution or Clause B Distribution shall be deemed not to be “outstanding immediately prior to the open of business on such Ex-Dividend Date or such effective date” within the meaning of Section 4.04(a) or “outstanding immediately prior to the open of business on such Ex-Dividend Date” within the meaning of Section 4.04(b).

If any distribution of the type described in this Section 4.04(c) is declared but not so made, the Conversion Rate shall be immediately readjusted, effective as of the date the Board of Directors determines not to make such distribution, to the Conversion Rate that would then be in effect if such distribution had not been declared.

(d)           If the Company makes any cash dividend or distribution to all or substantially all holders of Common Stock, the Conversion Rate shall be adjusted based on the following formula:

where

CR0 =                                                               The Conversion Rate in effect immediately prior to the open of business on the Ex-Dividend Date for such dividend or distribution;

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CR1 =                                                               The Conversion Rate in effect immediately after the open of business on the Ex-Dividend Date for such dividend or distribution;

SP0 =                                                                   The Last Reported Sale Price of the Common Stock on the Trading Day immediately preceding the Ex-Dividend Date for such dividend or distribution; and

C =                                                                             The amount in cash per share the Company distributes to holders of the Common Stock.

In the case of an adjustment pursuant to this Section 4.04(d), such adjustment shall become effective immediately after the open of business on the Ex-Dividend Date or effective date for the relevant dividend or distribution. If the portion of the cash so distributed applicable to one share of the Common Stock is equal to or greater than the Last Reported Sale Price of a share of Common Stock on the Trading Day immediately preceding the Ex-Dividend Date for such dividend or distribution, in lieu of the adjustment set forth above, adequate provision shall be made so that each Holder of Notes shall have the right to receive on the date on which such cash dividend or distribution is distributed to holders of Common Stock, for each $1,000 principal amount of Notes, the amount of cash such Holder would have received had such Holder owned a number of shares of Common Stock equal to the Conversion Rate in effect immediately prior to the Ex-Dividend Date for such distribution.  If such dividend or distribution is not so paid, the Conversion Rate shall be decreased, effective as of the date the Board of Directors determines not to make or pay such dividend or distribution, to be the Conversion Rate that would then be in effect if such dividend or distribution had not been declared.

(e)           If the Company or any of its Subsidiaries makes a payment in respect of a tender offer or exchange offer for Common Stock, to the extent that the cash and value of any other consideration included in the payment per share of Common Stock exceeds the Last Reported Sale Price per share of Common Stock on the Trading Day next succeeding the last date on which tenders or exchanges may be made pursuant to such tender or exchange offer, the Conversion Rate shall be increased based on the following formula:

where

CR0 =                                                               the Conversion Rate in effect immediately prior to the close of business on the 10th Trading Day immediately following, and including, the Trading Day next succeeding the date such tender or exchange offer expires;

CR1 =                                                               the Conversion Rate in effect immediately after the close of business on the 10th Trading Day immediately following, and including, the Trading Day next succeeding the date such tender or exchange offer expires;

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AC =                                                                    the aggregate value of all cash and any other consideration (as determined by the Board of Directors) paid or payable for shares purchased in such tender or exchange offer;

OS0 =                                                                 the number of shares of Common Stock outstanding immediately prior to the date such tender or exchange offer expires;

OS1 =                                                                  the number of shares of Common Stock outstanding immediately after the date such tender or exchange offer expires (after giving effect to the purchase of all shares accepted for purchase or exchange in such tender or exchange offer); and

SP1 =                                                                    the average of the Last Reported Sale Prices of the Common Stock over the 10 consecutive Trading Day period commencing on the Trading Day next succeeding the date such tender or exchange offer expires.

The adjustment to the Conversion Rate under this Section 4.04(e) shall occur as of the close of business on the tenth Trading Day immediately following, and including, the Trading Day next succeeding the date such tender or exchange offer expires; provided that in respect of any conversion within 10 Trading Days immediately following, and including, the expiration date of any tender or exchange offer, references with respect to 10 Trading Days shall be deemed replaced with such lesser number of Trading Days as have elapsed between the expiration date of such tender or exchange offer and the Conversion Date in determining the applicable Conversion Rate.

(f)            Subject to the applicable listing standards of The NASDAQ Global Market, the Company from time to time may increase the Conversion Rate by any amount for any period of at least 20 Business Days if the Board of Directors determines that such increase would be in the Company’s best interest, which determination shall be conclusive. Whenever the Conversion Rate is increased pursuant to this Section 4.04(f), the Company shall mail to Holders of record of the Notes a notice of the increase at least one day prior to the date the increased Conversion Rate takes effect, and such notice shall state the increased Conversion Rate and the period during which it will be in effect.

(g)           Subject to the applicable listing standards of The NASDAQ Global Market, the Company may (but shall not be required to) increase the Conversion Rate, in addition to any adjustments pursuant to Section 4.04 (a), 4.04(b), 4.04(c), 4.04(d), 4.04(e) or 4.04(f), if the Board of Directors considers such increase to be advisable to avoid or diminish any income tax to holders of Common Stock or rights to purchase Common Stock in connection with a dividend or distribution of shares (or rights to acquire shares) or similar event.

(h)           All calculations under this Article 4 shall be made by the Company and shall be made to the nearest cent (including, in the case of any adjustment to the Conversion Rate, the resulting adjustment to the Conversion Price) or to the nearest one ten-thousandth of a share. No adjustment shall be required to be made for the Company’s issuance of Common Stock or any securities convertible into or exchangeable for shares of Common Stock or rights to purchase shares

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of Common Stock or such convertible or exchangeable securities, other than as provided in this Section 4.04 and in Section 4.11 hereof.

(i)            Whenever the Conversion Rate is adjusted as herein provided, the Company shall promptly file with the Trustee and any Conversion Agent an Officers’ Certificate setting forth the Conversion Rate after such adjustment and setting forth a brief statement of the facts requiring such adjustment. Unless and until a Responsible Officer of the Trustee and the Conversion Agent shall have received such Officers’ Certificate, neither the Trustee nor the Conversion Agent shall not be deemed to have knowledge of any adjustment of the Conversion Rate and may assume without inquiry that the last Conversion Rate of which it has knowledge is still in effect. Promptly after delivery of such certificate, the Company shall prepare a notice of such adjustment of the Conversion Rate setting forth the adjusted Conversion Rate and the date on which each adjustment becomes effective and shall mail such notice of such adjustment of the Conversion Rate to each Holder of the Notes. Failure to deliver such notice shall not affect the legality or validity of any such adjustment.

(j)            For purposes of this Section 4.04, the number of shares of Common Stock at any time outstanding shall not include shares held in the treasury of the Company so long as the Company does not pay any dividend or make any distribution on shares of Common Stock held in the treasury of the Company, but shall include shares issuable in respect of scrip certificates issued in lieu of fractions of shares of Common Stock.

(k)           Notwithstanding the foregoing, if the application of the foregoing formulas set forth in this Section 4.04 would result in a decrease in the Conversion Rate, no adjustment to the Conversion Rate shall be made (other than as a result of a reverse share split or share combination).

(l)            Notwithstanding anything to the contrary in this Article 4, no adjustment to the Conversion Rate shall be made:

(i)    upon the issuance of any shares of Common Stock pursuant to any present or future plan providing for the reinvestment of dividends or interest payable on the Company’s securities and the investment of additional optional amounts in shares of Common Stock under any plan;

(ii)   upon the issuance of any shares of Common Stock or options or rights to purchase those shares pursuant to any present or future employee, director or consultant benefit plan or program of or assumed by the Company or any of its Subsidiaries;

(iii)  upon the issuance of any shares of Common Stock pursuant to any option, warrant, right or exercisable, exchangeable or convertible security not described in clause (ii) above and outstanding as of the date the Notes were first issued;

(iv)  for a change in the par value of the Common Stock; or

(v)   for accrued and unpaid interest and Additional Interest on the Notes.

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(m)          If a Conversion Rate adjustment becomes effective on any Ex-Dividend Date as described above, and a Holder that has converted its Notes on or after such Ex-Dividend Date and on or prior to the related record date would be treated as the record holder of shares of Common Stock as of the related Conversion Date as set forth in Section 4.02(e) based on an adjusted Conversion Rate for such Ex-Dividend Date, then, notwithstanding the Conversion Rate adjustment provisions above, the Conversion Rate adjustment relating to such Ex-Dividend Date shall not be made for such converting Holder. Instead, such Holder shall be deemed to be the record owner of shares of Common Stock on an unadjusted basis on such Conversion Date and participate in the related dividend, distribution or other event giving rise to such adjustment.

(n)           In the event of an increase in the Conversion Rate that would result in the Notes, in the aggregate, becoming convertible into shares of Common Stock in excess of limitations imposed by the applicable certain listing standards of The New York Stock Exchange, the Company shall, at its option, either obtain stockholder approval of such issuances or pay cash in lieu of delivering any shares of Common Stock otherwise deliverable on the Conversion Date in excess of such limitations based on the Daily VWAP on each Trading Day of the relevant Observation Period in respect of which, in lieu of delivering shares of Common Stock, the Company delivers cash pursuant to this Section 4.04(n).

SECTION 4.05.                    Certain Other Adjustments.  Whenever a provision of this Indenture requires the calculation of Last Reported Sale Prices or Daily VWAP over a span of multiple days, the Board of Directors will make appropriate adjustments to such Last Reported Sale Prices or Daily VWAP, the Conversion Rate, or the amount due upon conversion to account for any adjustment to the Conversion Rate that becomes effective, or any event requiring an adjustment to the Conversion Rate where the Ex-Dividend Date of the event occurs, at any time during the period from which such Last Reported Sale Prices or Daily VWAP are to be calculated.

SECTION 4.06.                    Adjustments Upon Certain Fundamental Changes or Redemption Notices.

(a)           If (i) a Make-Whole Fundamental Change occurs or (ii) on or after June 20, 2018, the Company gives notice to Holders of the Company’s intention to redeem any or all of the Notes as provided under Article 15 hereof, and, in each case, a Holder elects to convert its Notes in connection with such Make-Whole Fundamental Change or Redemption Notice, as the case may be, the Company shall, under the circumstances described below, increase the Conversion Rate for the Notes so surrendered for conversion by a number of additional shares of Common Stock (the “Additional Shares”) as described below. A conversion of Notes shall be deemed for these purposes to be “in connection with” such Make-Whole Fundamental Change, if the notice of conversion of the Notes is received by the Conversion Agent from, and including, the Effective Date of the Make-Whole Fundamental Change up to, and including, the Business Day immediately prior to the related Fundamental Change Purchase Date (or, in the case of an event that would have been a Fundamental Change but for the proviso in clause (2) of the definition thereof, the 35th Trading Day immediately following the Effective Date of such Make-Whole Fundamental Change). A conversion of Notes will be deemed for these purposes to be “in connection with” a Redemption Notice if the

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notice of conversion of the Notes is received by the Conversion Agent from, and including, the date of the Redemption Notice until the close of business on the Business Day preceding the Redemption Date.

(b)           Upon surrender of Notes for conversion in connection with a Make-Whole Fundamental Change or redemption, the Company shall have the right to deliver a number of Additional Shares, cash or a combination of cash and shares of Common Stock as provided under Section 4.03(a); provided, however, that if the consideration for the Common Stock in any Make-Whole Fundamental Change described in clause (2) of the definition of Fundamental Change is comprised entirely of cash, then, for any conversion of Notes following the Effective Date of such Make-Whole Fundamental Change, the conversion obligation shall be calculated based solely on the Stock Price for the Make-Whole Fundamental Change and shall be deemed to be an amount equal to the applicable Conversion Rate (including any adjustment for Additional Shares described in this Section) multiplied by such Stock Price. In such event, the conversion obligation shall be determined and paid to holders in cash on the third Business Day following the Conversion Date.

(c)           The number of Additional Shares, if any, by which the Conversion Rate will be increased will be determined by reference to the table attached as Schedule A hereto, based on the date on which the Make-Whole Fundamental Change or the date of the Redemption Notice, as the case may be, occurs or becomes effective (each, an “Effective Date”), and the price (the “Stock Price”) paid (or deemed paid) per share of the Common Stock in the Make-Whole Fundamental Change or the redemption, as the case may be. If the holders of the Common Stock receive only cash in a Make-Whole Fundamental Change described in clause (2) of the definition of Fundamental Change, the Stock Price shall be the cash amount paid per share. Otherwise, the Stock Price shall be the average of the Last Reported Sale Prices of the Common Stock over the five Trading-Day period ending on, and including, the Trading Day preceding the Effective Date or the date of the Redemption Notice, as applicable.

The exact Stock Prices and Effective Dates may not be set forth in the table in Schedule A, in which case:

(i)            If the Stock Price is between two Stock Prices in the table or the Effective Date is between two Effective Dates in the table, the number of Additional Shares shall be determined by a straight-line interpolation between the number of Additional Shares set forth for the higher and lower Stock Prices and the earlier and later Effective Dates, as applicable, based on a 365-day year.

(ii)           If the Stock Price is greater than $220.00 per share (subject to adjustment in the same manner as the Stock Prices set forth in the column headings of the table in Schedule A pursuant to subsection (d) below), no Additional Shares shall be added to the Conversion Rate.

(iii)          If the Stock Price is less than $60.17 per share (subject to adjustments in the same manner as the Stock Prices set forth in the column headings of the table in Schedule A pursuant to subsection (d) below), no Additional Shares shall be added to the Conversion Rate.

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Notwithstanding the foregoing, in no event shall the Conversion Rate exceed 16.6195 shares of Common Stock per $1,000 principal amount of Notes, subject to adjustments in the same manner as the Conversion Rate as set forth in Section 4.04.

(d)           The Stock Prices set forth in the column headings of the table in Schedule A hereto shall be adjusted as of any date on which the Conversion Rate of the Notes is otherwise adjusted. The adjusted Stock Prices shall equal the Stock Prices applicable immediately prior to such adjustment, multiplied by a fraction, the numerator of which is the Conversion Rate immediately prior to such adjustment giving rise to the Stock Price adjustment and the denominator of which is the Conversion Rate as so adjusted. The number of Additional Shares set forth in such table shall be adjusted in the same manner as the Conversion Rate as set forth in Section 4.04.

(e)           The Company shall notify the Holders of Notes of the Effective Date of any Make-Whole Fundamental Change and issue a press release announcing such Effective Date no later than five Business Days after such Effective Date, such notice to specify the Additional Shares such Holders shall be entitled to receive if they convert in connection with such Make-Whole Fundamental Change.

SECTION 4.07.                    Effect of Recapitalization, Reclassification, Consolidation, Merger or Sale.

(a)           If any of the following events occur:

(i)            any recapitalization or reclassification of, or change in, the Common Stock (other than changes resulting from a subdivision or combination);

(ii)           a consolidation, merger or combination involving the Company; or

(iii)          a sale, lease or other transfer to a third party of the consolidated assets of the Company and its Subsidiaries substantially as an entirety, or

(iv)          any statutory share exchange;

in each case as a result of which the Common Stock would be converted into, or exchanged for, or would be reclassified or changed into, stock, other securities, other property or assets (including cash or any combination thereof) (any such event, a “Merger Event”), then at the effective time of such Merger Event, the Company or the successor or purchasing Person, as the case may be, shall execute with the Trustee, without the consent of Holders of the Notes, a supplemental indenture providing that at and after the effective time of such Merger Event, the right to convert a Note will be changed into a right to convert such Note as set forth in this Indenture into the kind and amount of shares of stock, other securities or other property or assets (including cash or any combination thereof) that a holder of a number of shares of Common Stock equal to the Conversion Rate prior to such Merger Event would have owned or been entitled to receive (the “Reference Property”, with each “unit of Reference Property” meaning the type and amount of Reference Property that a holder of one share of Common Stock is entitled to receive) upon such Merger Event; provided, however, that at and

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after the effective time of the Merger Event (i) the Company will continue to have the right to determine the form of consideration to be paid or delivered, as the case may be, upon conversion of the Notes as set forth in Section 4.03, (ii) the amount payable in cash upon conversion of the Notes as set forth under Section 4.03 will continue to be payable in cash, (iii) the number of shares of Common Stock (if the Company elects Physical Settlement or Combination Settlement) deliverable upon conversion of the Notes under Section 4.03 will be instead deliverable in the amount and type of Reference Property that a holder of that number of shares of Common Stock would have been entitled to receive in such Merger Event and (iv) the Daily VWAP will be calculated based on the value of a unit of Reference Property.

If, as a result of the Merger Event, each share of Common Stock is converted into, or exchanged for, the right to receive more than a single type of consideration (determined based in part upon any form of stockholder election), then (x) the Reference Property into which the Notes will be convertible will be deemed to be the weighted average of the types and amounts of consideration received by the holders of Common Stock that affirmatively make such an election, and (y) the unit of Reference Property for purposes of the foregoing sentence shall refer to the consideration referred to in clause (x) attributable to one share of Common Stock.  If no holders of Common Stock affirmatively make such an election, the Reference Property into which the Notes will be convertible will be the types and amounts of consideration actually received by the holders of Common Stock.  The Company will notify Holders, the Trustee and the Conversion Agent (if other than the Trustee) of the weighted average as soon as possible after such determination is made.

The Company shall not become a party to any such Merger Event unless its terms are consistent with this Section 4.07(a). Such supplemental indenture shall provide for adjustments which shall be as nearly equivalent as may be practicable to the adjustments provided for in this Article 4 in the judgment of the Board of Directors or the board of directors of the successor Person. If, in the case of any such recapitalization, reclassification, change, consolidation, merger, combination, sale, lease, other transfer or statutory share exchange, the Reference Property receivable thereupon by a holder of Common Stock includes shares of stock, securities or other property or assets (including cash or any combination thereof) of a Person other than the successor or purchasing Person, as the case may be, in such reorganization, reclassification, change, consolidation, merger, combination, sale, lease, other transfer or statutory share exchange, then such supplemental indenture shall also be executed by such other Person.

(b)           The Company shall cause notice of the execution of such supplemental indenture to be mailed to each Holder, at the address of such Holder as it appears on the register of the Notes maintained by the Note Registrar, within 20 calendar days after execution thereof. Failure to deliver such notice shall not affect the legality or validity of such supplemental indenture. The above provisions of this Section 4.07 shall similarly apply to successive reclassifications, changes, consolidations, mergers, combinations, sales and conveyances. If this Section 4.07 applies to any Merger Event, Section 4.04 shall not apply.

SECTION 4.08.                    Taxes on Shares Issued.  The Company will pay any documentary, stamp or similar issue or transfer tax due on the issue or delivery of shares of Common Stock on

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conversion of Notes pursuant hereto; provided, however, that if such documentary, stamp or similar issue or transfer tax is due because the Holder of such Notes has requested that shares of Common Stock be issued in a name other than that of the Holder of the Notes converted, then such taxes will be paid by the Holder, and the Company shall not be required to issue or deliver any stock certificate evidencing such shares unless and until the Holder shall have paid to the Company the amount of such tax or shall have established to the satisfaction of the Company that such tax has been paid.

SECTION 4.09.                    Reservation of Shares; Shares to be Fully Paid; Compliance With Governmental Requirements; Listing of Common Stock.  The Company shall reserve, out of its authorized but unissued shares or shares held in treasury, sufficient shares of Common Stock to satisfy conversion of the Notes from time to time as such Notes are presented for conversion (assuming that, at the time of the computation of such number of shares or securities, all such Notes would be converted by a single Holder and that Physical Settlement would apply).

The Company covenants that all shares of Common Stock that may be issued upon conversion of Notes shall be newly issued shares or treasury shares, shall be duly authorized, validly issued, fully paid and non-assessable and shall be free from preemptive rights and free from any tax, lien or charge (other than those created by the Holder).

The Company shall list or cause to have quoted any shares of Common Stock to be issued upon conversion of Notes on each national securities exchange or over-the-counter or other domestic market on which the Common Stock is then listed or quoted.

SECTION 4.10.                    Responsibility of Trustee and Conversion Agent.  The Trustee and any Conversion Agent shall not at any time be under any duty or responsibility to any Holder of Notes to determine or calculate the Conversion Rate, to determine whether any facts exist which may require any adjustment of the Conversion Rate or to determine whether the Notes are currently convertible. The Trustee and the Conversion Agent shall not be accountable with respect to the validity or value (or the kind or amount) of any shares of Common Stock or of any other securities or property that may at any time be issued or delivered upon the conversion of any Notes; and the Trustee and the Conversion Agent make no representations with respect thereto. Neither the Trustee nor the Conversion Agent shall be responsible for any failure of the Company to issue, transfer or deliver any shares of Common Stock or stock certificates or other securities or property or cash upon the surrender of any Notes for the purpose of conversion or to comply with any of the duties, responsibilities or covenants of the Company contained in this Article 4. The rights, privileges, protections, immunities and benefits given to the Trustee and the Conversion Agent, including without limitation its right to be compensated, reimbursed, and indemnified, are extended to, and shall be enforceable by, the Trustee and the Conversion Agent in any other capacity either may hold hereunder, including, if either, is so appointed by the Company and accepts such appointment, as Bid Solicitation Agent.

SECTION 4.11.                    Notice to Holders Prior to Certain Actions.  In case:

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(a)           the Company shall declare a dividend (or any other distribution) on its Common Stock that would require an adjustment in the Conversion Rate pursuant to Section 4.04; or

(b)           the Company shall authorize the granting to the holders of all or substantially all of its Common Stock of rights or warrants to subscribe for or purchase any share of any class or any other rights or warrants that would require an adjustment in the Conversion Rate pursuant to Section 4.04 or Section 4.12 hereof; or

(c)           of any reclassification or reorganization of the Common Stock of the Company (other than a change in par value, or from par value to no par value, or from no par value to par value), or of any consolidation or merger to which the Company is a party and for which approval of any stockholders of the Company is required, or of the sale, lease or transfer of all or substantially all of the assets of the Company and its consolidated Subsidiaries; or

(d)           of the voluntary or involuntary dissolution, liquidation or winding up of the Company or any of its Subsidiaries; then, in each case (unless notice of such event is otherwise required pursuant to another provision of this Indenture), the Company shall cause to be filed with the Trustee and the Conversion Agent and to be mailed to each Holder of Notes at such Holder’s address appearing on a list of Holders of Notes, which the Company shall provide to the Trustee and the Conversion Agent, as promptly as practicable but in any event at least 10 calendar days prior to the applicable date hereinafter specified, a notice stating (x) the date on which a record is to be taken for the purpose of such dividend (or any other distribution) or rights or warrants, or, if a record is not to be taken, the date as of which the holders of Common Stock of record to be entitled to such dividend, distribution or rights or warrants are to be determined, or (y) the date on which such reclassification, reorganization, consolidation, merger, sale, lease, transfer, dissolution, liquidation or winding up is expected to become effective or occur, and the date as of which it is expected that holders of Common Stock of record shall be entitled to exchange their Common Stock for securities or other property deliverable upon such reclassification, reorganization, consolidation, merger, sale, transfer, dissolution, liquidation or winding up. Failure to give such notice, or any defect therein, shall not affect the legality or validity of such dividend (or any other distribution), reclassification, reorganization, consolidation, merger, sale, transfer, dissolution, liquidation or winding up.

SECTION 4.12.                    Stockholder Rights Plan.  Each share of Common Stock issued upon conversion of Notes pursuant to this Article 4 shall be entitled to receive the appropriate number of rights, if any, and the certificates representing the Common Stock issued upon such conversion shall bear such legends, if any, in each case as may be provided by the terms of any stockholder rights plan adopted by the Company, as the same may be amended from time to time. Notwithstanding the foregoing, if prior to any conversion such rights have separated from the shares of Common Stock in accordance with the provisions of the applicable stockholder rights agreement, the Conversion Rate shall be adjusted at the time of separation as if the Company had distributed to all holders of the Common Stock, shares of the Company’s capital stock, evidences of indebtedness, assets, property, rights or warrants as described in Section 4.04(c) above, subject to readjustment in the event of the expiration, termination or redemption of such rights.

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ARTICLE 5

DEFAULTS AND REMEDIES

SECTION 5.01.                    Events of Default.  Each of the following shall be an “Event of Default”:

(a)           the Company defaults in the payment of interest, including any Additional Interest, on any Note when the same becomes due and payable and such default continues for a period of 30 days;

(b)           the Company defaults in the payment of the principal of any Note when the same becomes due and payable at its Maturity, upon acceleration, upon any required repurchase, upon optional redemption, or otherwise;

(c)           failure by the Company to comply with its obligation to convert the Notes in accordance with the Indenture upon exercise of a Holder’s conversion right in accordance with Article 4 hereof;

(d)           failure by the Company to provide a Fundamental Change Company Notice pursuant to Section 3.01(b) or notice of a specified corporate transaction required by Section 4.01(a)(iii) or Section 4.01(a)(iv) in accordance with the relevant Section, in each case when due;

(e)           failure by the Company to comply with its obligations under Section 6.01 hereof;

(f)            the Company fails to perform or observe with any of the covenants or agreements contained in the Notes or Indenture (other than a default set forth in clauses (a), (b), (c), (d) or (e) above) for 60 days after written notice to the Company from the Trustee or to the Trustee from the Holders of at least 25% in principal amount of the Notes then outstanding;

(g)           the entry by a court of competent jurisdiction of one or more judgments, orders or decrees against the Company or any subsidiary of the Company or any of their respective property or assets in an aggregate amount in excess of $20.0 million, which judgments, orders or decrees have not been vacated, discharged, satisfied or stayed pending appeal within 30 days from the entry thereof and with respect to which legal enforcement proceedings have been commenced;

(h)           default under any mortgage, indenture or instrument under which there may be issued or by which there may be secured or evidenced any indebtedness for money borrowed by the Company or any subsidiary of the Company (or the payment of which is guaranteed by the Company or any subsidiary of the Company), which default is caused by a failure to pay principal of or premium, if any, on such indebtedness upon its stated maturity or which default results in the acceleration of such indebtedness prior to its express maturity and the principal amount of any such indebtedness, together with the principal amount of any other such indebtedness the maturity of

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which has been so accelerated, aggregates $20.0 million or more and such acceleration has not been rescinded or annulled or such indebtedness discharged in full within 30 days;

(i)            the Company or any Significant Subsidiary of the Company pursuant to or within the meaning of any Bankruptcy Law:

(A)          commences a voluntary case,

(B)          consents to the entry of an order for relief against it in an involuntary case,

(C)          consents to the appointment of a Bankruptcy Custodian of it or for all or substantially all of its property, or

(D)          makes a general assignment for the benefit of its creditors; and

(j)            a court of competent jurisdiction enters an order or decree under any Bankruptcy Law that remains unstayed and in effect for 90 days and that:

(A)          is for the relief against the Company or any Significant Subsidiary of the Company as debtor in an involuntary case,

(B)          appoints a Bankruptcy Custodian of the Company or any Significant Subsidiary of the Company or a Bankruptcy Custodian for all or substantially all of the property of any Significant Subsidiary of the Company, or

(C)          orders the liquidation of the Company or any Significant Subsidiary of the Company.

SECTION 5.02.                    Additional Interest.  Notwithstanding any provisions of the Indenture to the contrary, if the Company so elects, the sole remedy for an Event of Default relating to any obligation to file documents and reports with the Trustee as required by Section 9.06 of this Indenture shall for the first 360 days following the occurrence of such Event of Default, which period shall not commence until the expiration of the 60-day period referred to in Section 5.01(f), consist exclusively of the right to receive additional interest on the Notes at a rate equal to 0.25% per annum of the principal amount of the Notes outstanding for each during the 180-day period beginning on, and including, the occurrence of such Event of Default during which such Event of Default is continuing, and at a rate equal to 0.50% per annum of the principal amount of the Notes outstanding for each day from the 181st day until the 360th day during which such Event of Default is continuing (in each case, and together with any additional interest described in Section 9.10, “Additional Interest”). In order to elect to pay Additional Interest as the sole remedy during the first 360 days after the occurrence of an Event of Default described in the preceding sentence, the Company must give notice to Holders of the Notes, the Trustee and the Paying Agent of such election on or prior to the close of business on the Business Day before the date on which such Event of Default would occur. If the Company so elects, such Additional Interest shall be payable in the

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same manner and on the same dates as the stated interest payable on the Notes. Upon the failure to timely give all Holders, the Trustee and the Paying Agent such notice, the Notes will be subject to immediate acceleration as provided in Section 5.03 of this Indenture. On the 361st day after such Event of Default occurs (if such Event of Default is not cured or waived prior to such 361st day), the Notes shall be subject to acceleration as provided in Section 5.03 of the Indenture. This Section 5.02 shall not affect the rights of Holders of Notes in the event of the occurrence of any other Event of Default. Whenever in the Indenture there is mentioned, in any context, the payment of interest on, or in respect of, any Note, such mention shall be deemed to include mention of the payment of Additional Interest provided for in this Section 5.02 to the extent that, in such context, Additional Interest is, was or would be payable in respect thereof pursuant to the provisions of this Section 5.02, and express mention of the payment of Additional Interest (if applicable) in any provision shall not be construed as excluding Additional Interest in those provisions where such express mention is not made.

In no event shall Additional Interest (including any Additional Interest that may accrue pursuant to Section 9.10) accrue at a rate per year in excess of 0.50%, regardless of the number of events or circumstances giving rise to the requirement to pay such Additional Interest.

SECTION 5.03.                    Acceleration.  Subject to the provisions of Section 5.02, if an Event of Default occurs and is continuing, the Trustee by notice to the Company, or the Holders of at least 25% in aggregate principal amount of the outstanding Notes by notice to the Company and the Trustee, may, and the Trustee at the request of such holders shall, declare 100% of the principal of and accrued and unpaid interest on all the Notes to be due and payable. Upon such a declaration of acceleration, all principal and accrued and unpaid interest (including any Additional Interest) on the Notes will be due and payable immediately. However, upon an Event of Default arising out of Sections 5.01(i) or 5.01(j), the aggregate principal amount and accrued and unpaid interest (including any Additional Interest) will be due and payable immediately, without any declaration, notice or other act on the part of the Trustee or Holder. The Holders of a majority in principal amount of the then outstanding Notes affected by such Event of Default, by written notice to the Trustee, may rescind an acceleration and its consequences (other than nonpayment of principal of or premium, if any, or interest on or any Additional Interest with respect to the Notes) if the rescission would not conflict with any judgment or decree and if all existing Events of Default with respect to the Notes have been cured or waived, except nonpayment of principal, premium, if any, interest or any Additional Interest that has become due solely because of the acceleration.

SECTION 5.04.                    Payments of Notes on Default; Suit Therefor.  If an Event of Default described in clause (a) or (b) of Section 5.01 shall have occurred and be continuing, the Company shall, upon demand of the Trustee, pay to it, for the benefit of the holders of the Notes, the whole amount then due and payable on the Notes for principal, premium, if any, and interest, with interest on any overdue principal, premium, if any, interest, at the rate borne by the Notes at such time, and, in addition thereto, such further amount as shall be sufficient to cover any amounts due to the Agent and the Trustee under Section 11.06. If the Company shall fail to pay such amounts forthwith upon such demand, the Trustee, in its own name and as trustee of an express trust, may institute a judicial proceeding for the collection of the sums so due and unpaid, may prosecute such proceeding to

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judgment or final decree and may enforce the same against the Company or any other obligor upon the Notes and collect the monies adjudged or decreed to be payable in the manner provided by law out of the property of the Company or any other obligor upon the Notes, wherever situated.

In the event there shall be pending proceedings for the bankruptcy or for the reorganization of the Company or any other obligor on the Notes under any Bankruptcy Law, or in case a receiver, assignee or trustee in bankruptcy or reorganization, liquidator, sequestrator or similar official shall have been appointed for or taken possession of the Company or such other obligor, the property of the Company or such other obligor, or in the event of any other judicial proceedings relative to the Company or such other obligor upon the Notes, or to the creditors or property of the Company or such other obligor, the Trustee, irrespective of whether the principal of the Notes shall then be due and payable as therein expressed or by declaration or otherwise and irrespective of whether the Trustee shall have made any demand pursuant to the provisions of this Section 5.04, shall be entitled and empowered, by intervention in such proceedings or otherwise, to file and prove a claim or claims for the whole amount of principal premium, if any, and accrued and unpaid interest in respect of the Notes, and, in case of any judicial proceedings, to file such proofs of claim and other papers or documents and to take such other actions as it may deem necessary or advisable in order to have the claims of the Trustee (including any claim for the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and counsel) and of the Holders of Notes allowed in such judicial proceedings relative to the Company or any other obligor on the Notes, its or their creditors, or its or their property, and to collect and receive any monies or other property payable or deliverable on any such claims, and to distribute the same after the deduction of any amounts due the Trustee under Section 11.06; and any receiver, assignee or trustee in bankruptcy or reorganization, liquidator, custodian or similar official is hereby authorized by each of the Holders of Notes to make such payments to the Trustee, as administrative expenses, and, in the event that the Trustee shall consent to the making of such payments directly to the Holders of Notes, to pay to the Trustee any amount due it for reasonable compensation, expenses, advances and disbursements, including agent’s and counsel fees and expenses, and including any other amounts due to the Trustee under Section 11.06 hereof, incurred by it up to the date of such distribution. To the extent that such payment of reasonable compensation, expenses, advances and disbursements out of the estate in any such proceedings shall be denied for any reason, payment of the same shall be secured by a lien on, and shall be paid out of, any and all distributions, dividends, monies, securities and other property that the holders of the Notes may be entitled to receive in such proceedings, whether in liquidation or under any plan of reorganization or arrangement or otherwise.

Nothing herein contained shall be deemed to authorize the Trustee to authorize or consent to or accept or adopt on behalf of any Holder of Notes any plan of reorganization, arrangement, adjustment or composition affecting the Holder of Notes or the rights of any Holder of Notes thereof, or to authorize the Trustee to vote in respect of the claim of any Holder of Notes in any such proceeding.

All rights of action and of asserting claims under this Indenture, or under any of the Notes, may be enforced by the Trustee without the possession of any of the Notes, or the production thereof at any trial or other proceeding relative thereto, and any such suit or proceeding instituted by the

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Trustee shall be brought in its own name as trustee of an express trust, and any recovery of judgment shall, after provision for the payment of the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and counsel, be for the ratable benefit of the holders of the Notes.

In any proceedings brought by the Trustee (and in any proceedings involving the interpretation of any provision of this Indenture to which the Trustee shall be a party) the Trustee shall be held to represent all the holders of the Notes, and it shall not be necessary to make any holders of the Notes parties to any such proceedings.

In case the Trustee shall have proceeded to enforce any right under this Indenture and such proceedings shall have been discontinued or abandoned because of such waiver or rescission and annulment or for any other reason or shall have been determined adversely to the Trustee, then and in every such case the Company, the Holders of Notes, and the Trustee shall, subject to any determination in such proceeding, be restored respectively to their several positions and rights hereunder, and all rights, remedies and powers of the Company, the Holders of Notes, and the Trustee shall continue as though no such proceeding had been instituted.

SECTION 5.05.                    Application of Monies Collected by the Agent or the Trustee.  Any monies collected by the Agent or the Trustee pursuant to this Article 5 with respect to the Notes shall be applied in the order following, at the date or dates fixed by the Agent or the Trustee for the distribution of such monies, upon presentation of the several Notes, and stamping thereon the payment, if only partially paid, and upon surrender thereof, if fully paid:

First, to the payment of all amounts due the Trustee and/or the Agent under this Indenture (including its agents and counsel);

Second, in case the principal of the outstanding Notes shall not have become due and be unpaid, to the payment of interest on the Notes, including any Additional Interest, in default in the order of the date due of the installments of such interest, with interest (to the extent that such interest has been collected by the Agent or the Trustee) upon the overdue installments of interest at the rate borne by the Notes at such time, such payments to be made ratably to the Persons entitled thereto;

Third, in case the principal of the outstanding Notes shall have become due, by declaration or otherwise, and be unpaid to the payment of the whole amount including the payment of the Fundamental Change Purchase Price, Redemption Price and the cash component of the Conversion Obligation, if any, then owing and unpaid upon the Notes for principal and premium, if any, and interest, including any Additional Interest, with interest on the overdue principal and premium, if any, and (to the extent that such interest has been collected by the Trustee) upon overdue installments of interest at the rate borne by the Notes at such time, and in case such monies shall be insufficient to pay in full the whole amounts so due and unpaid upon the Notes, then to the payment of such principal and premium, if any, and interest without preference or priority of principal and premium, if any, over interest, or of interest over principal and premium, if any, or of any installment of interest over any other installment of interest, or of any Note over any other Note, ratably to the aggregate of such principal and premium, if any, and accrued and unpaid interest; and

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Fourth, to the payment of the remainder, if any, to the Company.

SECTION 5.06.                    Proceedings by Holders of Notes.  No holder of any Note shall have any right by virtue of or by availing of any provision of this Indenture to institute any suit, action or proceeding in equity or at law upon or under or with respect to this Indenture, or for the appointment of a receiver, trustee, liquidator, custodian or other similar official, or for any other remedy hereunder, unless such holder previously shall have given to the Trustee written notice of an Event of Default and of the continuance thereof, as hereinbefore provided, and unless also the holders of not less than 25% in aggregate principal amount of the Notes then outstanding shall have made written request to the Trustee to institute such action, suit or proceeding in its own name as Trustee hereunder and shall have offered to the Trustee such security or indemnity reasonably satisfactory to it against any loss, liability or expense to be incurred therein or thereby, and the Trustee for 60 days after its receipt of such notice, request and offer of indemnity, shall have neglected or refused to institute any such action, suit or proceeding and no direction that, in the opinion of the Trustee, is inconsistent with such written request shall have been given to the Trustee by the holders of a majority in principal amount of the Notes outstanding within such 60-day period pursuant to Section 5.09; it being understood and intended, and being expressly covenanted by the taker and holder of every Note with every other taker and holder and the Trustee that no one or more Noteholders shall have any right in any manner whatever by virtue of or by availing of any provision of this Indenture to affect, disturb or prejudice the rights of any other Noteholder (it being understood that the Trustee does not have an affirmative duty to ascertain whether or not such actions or forbearances are unduly prejudicial to such Noteholders), or to obtain or seek to obtain priority over or preference to any other such holder, or to enforce any right under this Indenture, except in the manner herein provided and for the equal, ratable and common benefit of all Noteholders (except as otherwise provided herein). For the protection and enforcement of this Section 5.06, each and every Noteholder and the Trustee shall be entitled to such relief as can be given either at law or in equity.

Notwithstanding any other provision of this Indenture and any provision of any Note, the right of any Holder of Notes to (i) receive payment of principal of and premium, if any, and interest and any Additional Interest when due, (ii) receive payment or delivery of the consideration due upon conversion, (iii) receive the Fundamental Change Purchase Price when due, (iv) receive the Redemption Price when due in connection with an optional redemption or (v) bring suit for the enforcement of any of (i), (ii), (iii) and (iv) above, is absolute and unconditional and shall not be impaired or affected without the consent of such Holder.

Anything in this Indenture or the Notes to the contrary notwithstanding, the holder of any Note, without the consent of either the Trustee or the holder of any other Note, on its own behalf and for its own benefit, may enforce, and may institute and maintain any proceeding suitable to enforce, its rights of conversion as provided herein.

SECTION 5.07.                    Proceedings by Trustee.  In case of an Event of Default the Trustee may in its discretion proceed to protect and enforce the rights vested in it by this Indenture by such appropriate judicial proceedings as are necessary to protect and enforce any of such rights, either by

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suit in equity or by action at law or by proceeding in bankruptcy or otherwise, whether for the specific enforcement of any covenant or agreement contained in this Indenture or in aid of the exercise of any power granted in this Indenture, or to enforce any other legal or equitable right vested in the Trustee by this Indenture or by law.

SECTION 5.08.                    Remedies Cumulative and Continuing.  Except as provided in the last paragraph of Section 2.07 and Section 5.02, all powers and remedies given by this Article 5 to the Trustee or to the Noteholders shall, to the extent permitted by law, be deemed cumulative and not exclusive of any thereof or of any other powers and remedies available to the Trustee or the holders of the Notes, by judicial proceedings or otherwise, to enforce the performance or observance of the covenants and agreements contained in this Indenture, and no delay or omission of the Trustee or of any holder of any of the Notes to exercise any right or power accruing upon any Default or Event of Default shall impair any such right or power, or shall be construed to be a waiver of any such Default or any acquiescence therein; and, subject to the provisions of Section 5.06, every power and remedy given by this Article 5 or by law to the Trustee or to the Noteholders may be exercised from time to time, and as often as shall be deemed expedient, by the Trustee or by the Noteholders.

SECTION 5.09.                    Direction of Proceedings and Waiver of Defaults by Majority of Holders of Notes.  The Holders of a majority in aggregate principal amount of the Notes at the time outstanding determined in accordance with Section 12.04 shall have the right to direct the time, method and place of conducting any proceeding for any remedy available to the Trustee or exercising any trust or power conferred on the Trustee with respect to Notes; provided, however, that (a) such direction shall not be in conflict with any rule of law or with this Indenture, and (b) the Trustee may take any other action deemed proper by the Trustee that is not inconsistent with such direction. The Trustee may refuse to follow any direction that it determines is unduly prejudicial to the rights of any other holder or that would involve the Trustee in personal liability. The Holders of a majority in aggregate principal amount of the Notes at the time outstanding determined in accordance with Section 12.04 by notice to the Trustee may waive an existing or past Default or Event of Default with respect to such Notes and its consequences, except (1) a continuing Default or Event of Default in the payment of premium, accrued and unpaid interest or any accrued and unpaid Additional Interest on, or the principal (including any Fundamental Change Purchase Price in connection with a Fundamental Change or the Redemption Price in connection with an optional redemption) of, the Notes when due, (2) a continuing Default or Event of Default in the payment or delivery of any consideration due upon conversion of any Note, or (3) a continued Default in respect of a provision that under Article 7 cannot be amended or supplemented without the consent of each Holder affected. Upon any such waiver, such Default shall cease to exist, and any Event of Default arising therefrom shall be deemed to have been cured for every purpose of this Indenture, but no such waiver shall extend to any subsequent or other Default or impair any right consequent thereon. Whenever any Default or Event of Default hereunder shall have been waived as permitted by this Section 5.09, said Default or Event of Default shall for all purposes of the Notes and this Indenture be deemed to have been cured and to be not continuing; but no such waiver shall extend to any subsequent or other Default or Event of Default or impair any right consequent thereon.

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SECTION 5.10.                    Notice of Defaults.  The Trustee shall, within 90 days after the occurrence and continuance of a Default or Event of Default of which a Responsible Officer has actual knowledge, mail to all Noteholders as the names and addresses of such holders appear upon the Note Register, notice of all Defaults or Events of Default known to a Responsible Officer, unless such Defaults or Events of Default shall have been cured or waived before the giving of such notice; and provided that, except in the case of a Default or in the payment of the principal of, or premium, if any, accrued and unpaid interest including any accrued and unpaid Additional Interest on any of the Notes, including without limiting the generality of the foregoing any Default or Event of Default in the payment of any Fundamental Change Purchase Price, the Redemption Price in connection with an optional redemption, or a Default or Event of Default in the payment or delivery of consideration due upon conversion of the Notes, then in any such event the Trustee shall be protected in withholding such notice if and so long as the Trustee in good faith determines that the withholding of such notice is in the interests of the Noteholders.

SECTION 5.11.                    Undertaking to Pay Costs.  All parties to this Indenture agree, and each holder of any Note by its acceptance thereof shall be deemed to have agreed, that any court may, in its discretion, require, in any suit for the enforcement of any right or remedy under this Indenture, or in any suit against the Agent or the Trustee for any action taken or omitted by it as Agent or Trustee (as applicable), the filing by any party litigant in such suit of an undertaking to pay the costs of such suit and that such court may in its discretion assess reasonable costs, including reasonable attorneys’ fees and expenses, against any party litigant in such suit, having due regard to the merits and good faith of the claims or defenses made by such party litigant; provided that the provisions of this Section 5.11 (to the extent permitted by law) shall not apply to any suit instituted by the Trustee, to any suit instituted by any Noteholder, or group of Noteholders, holding in the aggregate more than 10% in principal amount of the Notes at the time outstanding determined in accordance with Section 12.04, or to any suit instituted by any Noteholder for the enforcement of the payment of the principal of or premium, if any, accrued and unpaid interest, if any, on any Note (including, but not limited to, the Fundamental Change Purchase Price with respect to the Notes being repurchased as provided in this Indenture or the Redemption Price with respect to the Notes submitted for Redemption as provided in this Indenture) on or after the due date expressed or provided for in such Note or to any suit for the enforcement of the right to convert any Note in accordance with the provisions of Article 4.

ARTICLE 6

MERGER, SALE, CONVEYANCE AND LEASE

SECTION 6.01.                    Company May Consolidate, Etc..  Subject to the provisions of Section 6.02, the Company shall not consolidate with, merge with or into, any other Person, or sell, convey, transfer or lease all or substantially all of its property and assets, to any Person or permit any Person to merge with or into the Company, unless:

(a)           the resulting, surviving or transferee Person (if not the Company) (the “Successor”) is a corporation organized and validly existing under the laws of the United States of

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America, any state thereof or the District of Columbia and such corporation (if not the Company) expressly assumes by an indenture supplemental hereto, all of the Company’s obligations for the due and punctual payment of the principal of and interest on all the Notes and the performance and observance of every covenant of this Indenture and the Notes on the part of the Company to be performed or observed;

(b)           immediately after giving effect to such transaction, no Default or Event of Default shall have occurred and be continuing;

(c)           if as a result of such transaction the Notes become convertible into Reference Property issued by a third party, such third party fully and unconditionally guarantees all obligations of the Company and such successor Person under the Notes and this Indenture; and

(d)           the Company or such successor Person shall have delivered to the Trustee and the Agent an Officers’ Certificate and an Opinion of Counsel, each stating that such consolidation, merger, conveyance, transfer or lease and such supplemental indenture comply with this Article and that all conditions precedent provided for in the Indenture relating to such transaction have been complied with.

SECTION 6.02.                    Successor Person Substituted.  Upon any consolidation or merger of the Company or any sale, lease, conveyance, transfer or other disposition of all or substantially all of the assets of the Company in accordance with Section 6.01, the Successor formed by such consolidation or into or with which the Company is merged or to which such sale, lease, conveyance, transfer or other disposition is made shall succeed to, and be substituted for, and may exercise every right and power of the Company under this Indenture and the Securities with the same effect as if such Successor had been named as the Company herein and the predecessor Company, in the case of a sale, conveyance, transfer or other disposition, shall be released from all obligations under this Indenture and the Securities.

ARTICLE 7

SUPPLEMENTAL INDENTURES

SECTION 7.01.                    Amendments or Supplements Without Consent of Holders.  The Company, when authorized by the resolutions of the Board of Directors, and the Trustee, at the Company’s expense, may amend or supplement this Indenture or the Notes or waive any provision hereof or thereof without the consent of any Holder for one or more of the following purposes:

(a)           cure any ambiguity, omission, defect or inconsistency;

(b)           provide for the assumption by a successor corporation of the obligations of the Company under the Indenture;

(c)           add guarantees with respect to the Notes;

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(d)           secure the Notes;

(e)           add to the covenants of the Company for the benefit of the Holders or surrender any right or power conferred upon the Company;

(f)            increase the Conversion Rate as provided for in this Indenture;

(g)           make any change that does not adversely affect the rights of any Holder;

(h)           appoint a successor trustee or agent with respect to the Notes;

(i)            irrevocably elect a Settlement Method or a Cash Amount of eliminate the right to elect a particular Settlement Method; or

(j)            conform the provisions of the Indenture to the “Description of notes” section in the Offering Memorandum, as supplemented by the related pricing term sheet, as evidenced in an Officers’ Certificate.

Upon the written request of the Company, the Trustee is hereby authorized to join with the Company in the execution of any such supplemental indenture, to make any further appropriate agreements and stipulations that may be therein contained, but the Trustee shall not be obligated to, but may in its discretion, enter into any supplemental indenture that affects its own rights, duties or immunities under this Indenture or otherwise.

Any supplemental indenture authorized by the provisions of this Section 7.01 may be executed by the Company, the Trustee and the Paying Agent without the consent of the Holders of any of the Notes at the time outstanding, notwithstanding any of the provisions of Section 7.02.

SECTION 7.02.                    Amendments, Supplements or Waivers With Consent of Holders.  With the consent of the Holders of at least a majority in aggregate principal amount of the Notes at the time outstanding (including, without limitation, consents obtained in connection with a purchase of, or tender offer or exchange offer for, Notes), the Company, when authorized by the resolutions of the Board of Directors, the Paying Agent and the Trustee, at the Company’s expense, may from time to time and at any time enter into an indenture or indentures supplemental hereto for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of this Indenture or any supplemental indenture or of modifying in any manner the rights of the Holders of the Notes or waiving any past default; provided, however, that no such supplemental indenture shall, without the consent of each Holder of an outstanding Note affected:

(a)           reduce the amount of Notes whose Holders must consent to an amendment;

(b)           reduce the rate of or extend the stated time for payment of interest, including Additional Interest, on any Note;

(c)           reduce the principal of or extend the stated maturity of any Note;

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(d)           make any change that adversely affects the conversion rights of any Notes;

(e)           reduce the Fundamental Change Purchase Price or Redemption Price of any Note or amend or modify in any manner adverse to the Holders of Notes the Company’s obligation to make such payments, whether through an amendment or waiver of provisions in the covenants, definitions or otherwise;

(f)            change the place or currency of payment of principal or interest including any Additional Interest in respect of any Note;

(g)           change the ranking of the Notes;

(h)           impair the right of any Holder to receive payment of principal and interest, including Additional Interest, on such Holder’s Notes on or after the due dates therefor or to institute suit for the enforcement of any payment on or with respect to such Holder’s Notes; or

(i)            make any change in this Section 7.02 or Section 5.09, except to increase any such percentage or to provide that certain other provisions of the Indenture cannot be modified or waived without the consent of the Holder of each Note so affected.

Upon the written request of the Company, and upon the filing with the Trustee of evidence of the consent of Noteholders as aforesaid and subject to Section 7.05, the Trustee shall join with the Company in the execution of such supplemental indenture unless such supplemental indenture affects the Trustee’s own rights, duties or immunities under this Indenture or otherwise, in which case the Trustee may in its discretion, but shall not be obligated to, enter into such supplemental indenture.

It shall not be necessary for the consent of the Noteholders under this Section 7.02 to approve the particular form of any proposed supplemental indenture, but it shall be sufficient if such consent shall approve the substance thereof. After an amendment under this Indenture becomes effective, the Company shall mail to the holders a notice briefly describing such amendment. However, the failure to give such notice to all the holders, or any defect in the notice, will not impair or affect the validity of the amendment.

SECTION 7.03.                    Effect of Supplemental Indentures.  Upon the execution of any supplemental indenture pursuant to the provisions of this Article 7, this Indenture shall be and be deemed to be modified and amended in accordance therewith and the respective rights, limitation of rights, obligations, duties and immunities under this Indenture of the Trustee, the Agent, the Company and the Noteholders shall thereafter be determined, exercised and enforced hereunder subject in all respects to such modifications and amendments and all the terms and conditions of any such supplemental indenture shall be and be deemed to be part of the terms and conditions of this Indenture for any and all purposes.

SECTION 7.04.                    Notation on Notes.  Notes authenticated and delivered after the execution of any supplemental indenture pursuant to the provisions of this Article 7.04 may, at the

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Company’s expense, bear a notation in form approved by the Authenticating Agent as to any matter provided for in such supplemental indenture. If the Company shall so determine, new Notes so modified as to conform, in the opinion of the Board of Directors, to any modification of this Indenture contained in any such supplemental indenture may, at the Company’s expense, be prepared and executed by the Company, authenticated by the Authenticating Agent and delivered in exchange for the Notes then outstanding, upon surrender of such Notes then outstanding.

SECTION 7.05.                    Evidence of Compliance of Supplemental Indenture to be Furnished to Trustee.  In addition to the documents required by Section 14.05, the Trustee and the Paying Agent shall receive an Officers’ Certificate and an Opinion of Counsel as conclusive evidence that any supplemental indenture executed pursuant hereto complies with the requirements of this Article 7 and is permitted or authorized by the Indenture and is the legal, valid and binding obligation of the Company, enforceable against it in accordance with its terms.

ARTICLE 8

RESERVED

ARTICLE 9

COVENANTS OF THE COMPANY

SECTION 9.01.                    Payment of Principal, Premium and Interest.  The Company covenants and agrees that it will cause to be paid the principal of and premium, if any (including the Fundamental Change Purchase Price), and accrued and unpaid interest on each of the Notes at the places, at the respective times and in the manner provided herein and in the Notes.

SECTION 9.02.                    Maintenance of Office or Agency.  The Company will maintain an office or agency where the Notes may be surrendered for registration of transfer or exchange or for presentation for payment or repurchase (“Paying Agent”) or for conversion (“Conversion Agent”) and where notices and demands to or upon the Company in respect of the Notes and this Indenture may be served. The Company will give prompt written notice to the Trustee and the Agent of the location, and any change in the location, of such office or agency. If at any time the Company shall fail to maintain any such required office or agency or shall fail to furnish the Trustee and the Agent with the address thereof, such presentations, surrenders, notices and demands may be made or served at the Corporate Trust Office.

The Company may also from time to time designate co-registrars, one or more other offices or agencies where the Notes may be presented or surrendered for any or all such purposes and may from time to time rescind such designations; provided that no such designation or rescission shall in any manner relieve the Company of its obligation to maintain an office or agency for such purposes. The Company will give prompt written notice to the Trustee and the Agent of any such designation or rescission and of any change in the location of any such other office or agency. The terms “Paying Agent” and “Conversion Agent” include any such additional or other offices or agencies, as applicable.

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The Company hereby initially designates the Trustee as the Paying Agent, Note Registrar and Conversion Agent and the Corporate Trust Office of the Agent shall be considered as one such office or agency of the Company for each of the aforesaid purposes.

SECTION 9.03.                    Appointments to Fill Vacancies in Trustee’s and the Agent’s Office.  The Company, whenever necessary to avoid or fill a vacancy in the office of Trustee or Agent, will appoint, in the manner provided in Section 11.10, a Trustee or Agent (as applicable), so that there shall at all times be a Trustee and Agent hereunder.

SECTION 9.04.                    Provisions as to Trustee.

(a)           If the Company shall appoint a Paying Agent other than the Trustee, the Company will cause such Paying Agent to execute and deliver to the Trustee an instrument in which such agent shall agree with the Trustee, subject to the provisions of this Section 9.04:

(i)            that it will hold all sums held by it as such agent for the payment of the principal of and premium, if any, and accrued and unpaid interest on the Notes in trust for the benefit of the holders of the Notes;

(ii)           that it will give the Trustee prompt notice of any failure by the Company to make any payment of the principal of and premium, if any, and accrued and unpaid interest on the Notes when the same shall be due and payable; and

(iii)          that at any time during the continuance of an Event of Default, upon request of the Trustee, it will forthwith pay to the Trustee all sums so held in trust.

The Company shall, by 10:00 a.m., New York City time on the due date of the principal of, or premium (including the Fundamental Change Purchase Price or the Redemption Price in connection with an optional redemption), if any, or accrued and unpaid interest on the Notes, deposit with the Paying Agent a sum sufficient to pay such principal, premium (including the Fundamental Change Purchase Price or the Redemption Price in connection with an optional redemption), if any, or accrued and unpaid interest and (unless such Paying Agent is the Trustee) the Company will promptly notify the Trustee of any failure to take such action.

(b)           If the Company shall act as its own Paying Agent, it will, on or before each due date of the principal of, premium (including the Fundamental Change Purchase Price or the Redemption Price in connection with an optional redemption), if any, accrued and unpaid interest on the Notes, set aside, segregate and hold in trust for the benefit of the holders of the Notes a sum sufficient to pay such principal, premium (including the Fundamental Change Purchase Price or the Redemption Price in connection with an optional redemption), if any, accrued and unpaid interest so becoming due and will promptly notify the Trustee in writing of any failure to take such action and of any failure by the Company to make any payment of the principal of, premium (including the Fundamental Change Purchase Price or the Redemption Price in connection with an optional redemption), if any, accrued and unpaid interest on the Notes when the same shall become due and payable.

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(c)           Anything in this Section 9.04 to the contrary notwithstanding, the Company may, at any time, for the purpose of obtaining a satisfaction and discharge of this Indenture, or for any other reason, pay or cause to be paid to the Agent all sums held in trust by the Company or any Paying Agent hereunder as required by this Section 9.04, such sums to be held by the Trustee upon the trusts herein contained, and upon such payment by the Company or any Paying Agent to the Trustee, the Company or such Paying Agent shall be released from all further liability with respect to such sums.

(d)           Any money deposited with the Trustee or any Paying Agent, or then held by the Company, in trust for the payment of the principal of or premium (including the Fundamental Change Purchase Price or the Redemption Price in connection with an optional redemption), if any, or accrued and unpaid interest on any Note and remaining unclaimed for two years after such principal, premium (including the Fundamental Change Purchase Price or the Redemption Price in connection with an optional redemption) or interest has become due and payable shall be paid to the Company on request of the Company contained in an Officers’ Certificate, or (if then held by the Company) shall be discharged from such trust; and the holder of such Note shall thereafter, as an unsecured general creditor, look only to the Company for payment thereof, and all liability of the Trustee or such Paying Agent with respect to such trust money, and all liability of the Company as trustee thereof, shall thereupon cease.

SECTION 9.05.               Existence.  Subject to Article 6, the Company will do or cause to be done all things necessary to preserve and keep in full force and effect its corporate existence.

SECTION 9.06.               Reports by the Company.

(a)           The Company shall deliver to the Trustee within 15 days after the same is required to be filed with the Commission, copies of the quarterly and annual reports and of the information, documents and other reports, if any, that the Company is required to file with the Commission pursuant to Section 13 or 15(d) of the Exchange Act (giving effect to any grace period provided by Rule 12b-25 under the Exchange Act). Any quarterly or annual report or other information, document or other report that the Company files with the Commission pursuant to Section 13 or 15(d) of the Exchange Act on the Commission’s ▇▇▇▇▇ system shall be deemed to constitute delivery of such filing to the Trustee as of the time such documents are filed with ▇▇▇▇▇, it being understood that the Trustee shall have no responsibility whatsoever to determine if such filings have been made.

(b)           Delivery of the reports, information and documents described in clause (a) above to the Trustee is for informational purposes only, and the Trustee does not have the duty to review such information, documents or reports, is not considered to have notice of the content of such information, documents or reports and does not have a duty to verify the accuracy of such information, documents or reports. The Trustee’s receipt of such shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including the Company’s compliance with any of its covenants hereunder (as to which the Trustee is entitled to rely exclusively on Officers’ Certificates).

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(c)           At any time the Company is not subject to Section 13 or 15(d) of the Exchange Act, the Company shall, so long as any of the Notes or any shares of Common Stock issuable upon conversion thereof shall, at such time, constitute “restricted securities” within the meaning of Rule 144(a)(3) under the Securities Act, promptly provide to the Agent and shall, upon written request, provide to any Holder, beneficial owner or prospective purchaser of such Notes or any shares of Common Stock issuable upon conversion of such Notes, the information required to be delivered pursuant to Rule 144A(d)(4) under the Securities Act to facilitate the resale of such Notes or shares of Common Stock pursuant to Rule 144A.

SECTION 9.07.               Stay, Extension and Usury Laws.  The Company covenants (to the extent that it may lawfully do so) that it shall not at any time insist upon, plead, or in any manner whatsoever claim or take the benefit or advantage of, any stay, extension or usury law or other law that would prohibit or forgive the Company from paying all or any portion of the principal of or interest on the Notes as contemplated herein, wherever enacted, now or at any time hereafter in force, or that may affect the covenants or the performance of this Indenture; and the Company (to the extent it may lawfully do so) hereby expressly waives all benefit or advantage of any such law, and covenants that it will not, by resort to any such law, hinder, delay or impede the execution of any power herein granted to the Trustee or the Agent, but will suffer and permit the execution of every such power as though no such law had been enacted.

SECTION 9.08.               Compliance Certificate; Statements as to Defaults.  The Company shall deliver to the Trustee and the Agent, (i) within 120 days after the end of each Fiscal Year (beginning with the Fiscal Year ending on December 31, 2015), an Officers’ Certificate indicating whether or not the signers thereof have knowledge of the occurrence of any Event of Default under the Indenture during such fiscal year, and (ii) within 30 days after the occurrence thereof, written notice of any events that would constitute an Event of Default under the Indenture, the status of such events and the action that the Company is taking or proposes to take in respect thereof.

SECTION 9.09.               Further Instruments and Acts.  The Company will execute and deliver such further instruments and do such further acts as may be reasonably necessary or proper to carry out more effectively the purposes of this Indenture.

SECTION 9.10.               Rule 144A Information.

(a)           If, at any time during the six-month period beginning on, and including, the date that is six months after the last date of original issuance of the Notes, the Company fails to timely file any document or report that it is required to file with the Commission pursuant to Section 13 or 15(d) of the Exchange Act, as applicable (after giving effect to all applicable grace periods thereunder and other than current reports on Form 8-K), or the Notes are not otherwise freely tradable by Holders other than the Company’s Affiliates or Holders that were the Company’s Affiliates at any time during the three months preceding (as a result of restrictions pursuant to U.S. securities laws or the terms of this Indenture or the Notes), the Company shall pay Additional Interest on the Notes. In such circumstances, Additional Interest shall accrue on the Notes at the rate of 0.50% per annum of the principal amount of the Notes outstanding for each day during such period for which the Company’s failure to file has occurred and is continuing or the Notes are not

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otherwise freely tradable by Holders other than the Company’s Affiliates (or Holders that have been the Company’s Affiliates at any time during the three months preceding) without restrictions pursuant to U.S. securities laws or the terms of this Indenture or the Notes. As used in this Section 9.10(a), documents or reports that the Company is required to “file” with the Commission pursuant to Section 13 or 15(d) of the Exchange Act does not include documents or reports that the Company furnishes to the Commission pursuant to Section 13 or 15(d) of the Exchange Act.

(b)           If, and for so long as, the restrictive legend on the Notes specified in Section 2.04(a) has not been removed (or deemed removed pursuant to this Indenture), the Notes are assigned a restricted CUSIP number or the Notes are not otherwise freely tradable by Holders other than the Company’s Affiliates or Holders that were the Company’s Affiliates at any time during the three months preceding as of the 370th day after the last date of original issuance of the Notes, the Company shall pay Additional Interest on the Notes at a rate equal to 0.50% per annum of the principal amount of Notes outstanding until the restrictive legend on the Notes has been removed (or deemed removed) in accordance with Section 2.05(c), the Notes are assigned an unrestricted CUSIP and the Notes are freely tradable by Holders other than the Company’s Affiliates (or Holders that were the Company’s Affiliates at any time during the three months preceding) (without restrictions pursuant to U.S. securities laws or the terms of this Indenture or the Notes).

(c)           Additional Interest will be payable in arrears on each Interest Payment Date following accrual in the same manner as regular interest on the Notes.

(d)           Notwithstanding anything herein to the contrary, at no time shall Additional Interest pursuant to Section 9.10(a) or Section 9.10(b) and any Additional Interest that may be payable as a result of the Company’s election pursuant to Section 5.02, taken together, exceed 0.50% per annum, regardless of the number of events or circumstances giving rise to the requirement to pay such Additional Interest.

(e)           If Additional Interest is payable by the Company pursuant to Section 9.10(a) or Section 9.10(b), the Company shall deliver to the Trustee and the Paying Agent an Officer’s Certificate to that effect stating (i) the amount of such Additional Interest that is payable and (ii) the date on which such Additional Interest is payable. Unless and until a Responsible Officer of the Trustee receives at the Corporate Trust Office such a certificate, the Trustee may assume without inquiry that no such Additional Interest is payable. If the Company has paid Additional Interest directly to the Persons entitled to it, the Company shall promptly deliver to the Trustee an Officer’s Certificate setting forth the particulars of such payment.

ARTICLE 10

LISTS OF NOTEHOLDERS AND REPORTS BY THE COMPANY AND THE TRUSTEE

SECTION 10.01.             Lists of Noteholders.  The Company covenants and agrees that it will furnish or cause to be furnished to the Trustee and the Paying Agent, semi-annually, not more than fifteen days after each January 15 and July 15 in each year, beginning with January 15, 2016, and at such other times as the Trustee and the Paying Agent may request in writing, within 30 days after

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receipt by the Company of any such request (or such lesser time as the Trustee and the Paying Agent may reasonably request in order to enable it to timely provide any notice to be provided by it hereunder), a list in such form as the Trustee and the Paying Agent may reasonably require of the names and addresses of the Noteholders as of a date not more than fifteen days (or such other date as the Trustee and the Paying Agent may reasonably request in order to so provide any such notices) prior to the time such information is furnished, except that no such list need be furnished so long as the Trustee is acting as Note Registrar.

SECTION 10.02.             Preservation and Disclosure of Lists.  The Trustee and the Paying Agent shall preserve, in as current a form as is reasonably practicable, all information as to the names and addresses of the Noteholders contained in the most recent list furnished to it as provided in Section 10.01 or maintained the Note Registrar. The Trustee and the Paying Agent may destroy any list furnished to it as provided in Section 10.01 upon receipt of a new list so furnished.

ARTICLE 11

CONCERNING THE TRUSTEE AND THE AGENT

SECTION 11.01.             Duties and Responsibilities of Trustee and Agent.  The Trustee, except during the occurrence of an Event of Default, undertakes to perform such duties and only such duties as are specifically set forth in this Indenture and no implied covenants or obligations shall be read into this Indenture against the Trustee. In case an Event of Default has occurred (which has not been cured or waived) the Trustee shall exercise such of the rights and powers vested in it by this Indenture, and use the same degree of care and skill in their exercise, as a prudent person would exercise or use under the circumstances in the conduct of such person’s own affairs. The Trustee will be under no obligation to exercise any of the rights or powers under this Indenture at the request or direction of any of the holders unless such holders have offered to the Trustee indemnity or security satisfactory to it against the costs, losses, expenses and liabilities that might be incurred by it in compliance with such request or direction.

No provision of this Indenture shall be construed to relieve the Trustee or the Agent from liability for its own negligent action, its own negligent failure to act or its own intentional misconduct, except that:

(a)           prior to the occurrence of an Event of Default and after the curing or waiving of all Events of Default that may have occurred:

(i)            the duties and obligations of the Trustee and the Agent shall be determined solely by the express provisions of this Indenture and the Trustee and the Agent shall not be liable except for the performance of such duties and obligations as are specifically set forth in this Indenture and no implied covenants or obligations shall be read into this Indenture against the Trustee or the Agent; and

(ii)           in the absence of intentional misconduct on the part of the Trustee or the Agent, the Trustee or the Agent may conclusively rely, as to the truth of the statements and the

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correctness of the opinions expressed therein, upon any certificates or opinions furnished to the Trustee or the Agent and conforming to the requirements of this Indenture; but, in the case of any such certificates or opinions that by any provisions hereof are specifically required to be furnished to the Trustee or the Agent, the Trustee or the Agent shall be under a duty to examine the same to determine whether or not they conform to the requirements of this Indenture (but need not confirm or investigate the accuracy of any mathematical calculations or other facts stated therein);

(b)           neither the Trustee nor the Agent shall be liable for any error of judgment made in good faith by a Responsible Officer or Officers of the Trustee or the Agent (as applicable), unless it shall be proved that the Trustee or the Agent, as applicable, was negligent in ascertaining the pertinent facts;

(c)           neither the Trustee nor the Agent shall be liable with respect to any action taken or omitted to be taken by it in good faith in accordance with the direction of the holders of not less than a majority in principal amount of the Notes at the time outstanding determined as provided in Section 12.04 relating to the time, method and place of conducting any proceeding for any remedy available to the Trustee or the Agent, or exercising any trust or power conferred upon the Trustee or the Agent, under this Indenture;

(d)           whether or not therein provided, every provision of this Indenture relating to the conduct or affecting the liability of, or affording protection to, the Trustee or the Agent shall be subject to the provisions of this Section;

(e)           neither the Trustee nor the Agent shall be liable in respect of any payment (as to the correctness of amount, entitlement to receive or any other matters relating to payment) or notice effected by the Company or any Paying Agent or any records maintained by any co-registrar with respect to the Notes;

(f)            if any party fails to deliver a notice relating to an event the fact of which, pursuant to this Indenture, requires notice to be sent to the Trustee or the Agent, the Trustee or the Agent may conclusively rely on its failure to receive such notice as reason to act as if no such event occurred, unless such Responsible Officer of the Trustee or the Agent had actual knowledge of such event;

(g)           in the absence of written investment direction from the Company, all cash received by the Trustee or the Agent shall be placed in a non-interest bearing trust account, and in no event shall the Trustee or the Agent be liable for the selection of investments or for investment losses incurred thereon or for losses incurred as a result of the liquidation of any such investment prior to its maturity date or the failure of the party directing such investments prior to its maturity date or the failure of the party directing such investment to provide timely written investment direction, and the Trustee or the Agent shall have no obligation to invest or reinvest any amounts held hereunder in the absence of such written investment direction from the Company;

(h)           in the event that the Trustee or the Agent is also acting as Custodian, Note Registrar, Paying Agent, Conversion Agent or transfer agent hereunder, the rights and protections

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afforded to the Trustee or the Agent pursuant to this Article 11 shall also be afforded to such Custodian, Note Registrar, Paying Agent, Conversion Agent or transfer agent, as applicable;

(i)            neither the Trustee nor the Agent shall have a duty to see to the payment or discharge of any tax, assessment, or other governmental charge or any lien or encumbrance of any kind;

(j)            neither the Trustee nor the Agent shall be required to give any bond or surety in respect of the powers granted hereunder;

(k)           none of the provisions contained in this Indenture shall require the Trustee or the Agent to expend or risk its own funds or otherwise incur personal financial liability in the performance of any of its duties or in the exercise of any of its rights or powers;

(l)            neither the Trustee nor the Agent shall be required to give any bond or surety in respect of the performance of its powers and duties hereunder;

(m)          the Trustee or the Agent may request that the Company deliver a certificate setting forth the names of individuals and/or titles of officers authorized at such time to take specified actions pursuant to this Indenture;

(n)           no provision of this Indenture shall be deemed to impose any duty or obligation on the Agent or the Trustee to take or omit to take any action, or suffer any action to be taken or omitted, in the performance of its duties or obligations, or the exercise any right or power, to the extent that taking or omitting to take such action or suffering such action to be taken or omitted would violate applicable law binding upon it (which determination may be based on the advice or opinion of counsel); and

(o)           under no circumstances shall the Trustee be liable in its individual capacity for the obligation evidenced under the Notes.

SECTION 11.02.             Reliance on Documents, Opinions, Etc.  Except as otherwise provided in Section 11.01:

(a)           the Trustee and the Agent may conclusively rely and shall be fully protected in acting upon any resolution, certificate, statement, instrument, opinion, report, notice, request, consent, order, bond, Note, coupon or other paper or document believed by it in good faith to be genuine and to have been signed or presented by the proper party or parties;

(b)           any request, direction, order or demand of the Company mentioned herein shall be sufficiently evidenced by an Officers’ Certificate (unless other evidence in respect thereof be herein specifically prescribed); and any Board Resolution may be evidenced to the Trustee and the Agent by a copy thereof certified by the Secretary or an Assistant Secretary of the Company;

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(c)           each of the Agent and the Trustee may consult with counsel of its selection and require an Opinion of Counsel and any advice of such counsel or Opinion of Counsel shall be full and complete authorization and protection in respect of any action taken or omitted by it hereunder in good faith and in accordance with such advice or Opinion of Counsel;

(d)           each of the Agent and the Trustee shall be under no obligation to exercise any of the rights or powers vested in it by this Indenture at the request, order or direction of any of the Noteholders pursuant to the provisions of this Indenture, unless such Noteholders shall have offered to the Trustee or the Agent, as applicable, security or indemnity satisfactory to it against the costs, expenses and liabilities that may be incurred therein or thereby;

(e)           neither the Agent nor the Trustee shall be bound to make any investigation into the facts or matters stated in any resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture or other paper or document, but the Trustee or the Agent, in their respective discretion, may make such further inquiry or investigation into such facts or matters as it may see fit, and, if the Trustee or Agent, as the case may be, shall determine to make such further inquiry or investigation, it shall be entitled to examine the books, records and premises of the Company at reasonable times, in a reasonable manner and upon reasonable advance notice, personally or by agent or attorney at the expense of the Company and shall incur no liability of any kind by reason of such inquiry or investigation;

(f)            each of the Agent and the Trustee may execute any of the trusts or powers hereunder or perform any duties hereunder either directly or by or through agents, custodians, nominees or attorneys and the Trustee or the Agent, as the case may be, shall not be responsible for any misconduct or negligence on the part of any agent, custodian, nominee or attorney appointed by it with due care hereunder;

(g)           the permissive rights of the Trustee and the Agent enumerated herein shall not be construed as duties; and

(h)           neither the Trustee nor the Agent shall not be liable for any action taken, suffered, or omitted to be taken by it in good faith and reasonably believed by it to be authorized or within the discretion or rights or powers conferred upon it by this Indenture.

In no event shall the Trustee or the Agent be liable for any special, punitive, indirect or consequential loss or damage of any kind whatsoever (including but not limited to lost profits), even if the Trustee or the Agent has been advised of the likelihood of such loss or damage and regardless of the form of action. The Trustee and the Agent shall not be charged with knowledge of any Default or Event of Default, except (1) any Default or Event of Default of which a Responsible Officer shall have actual knowledge or (2) any Default or Event of Default of which written notice shall have been received by the Trustee or the Agent at their respective Corporate Trust Offices by the Company or by any holder of the Notes during any period it is serving as Note Registrar and Paying Agent for the Notes and such notice references the Notes and the Indenture, any Event of Default occurring pursuant to Sections 5.01(a), 5.01(b), 5.01(i) or 5.01(j).

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SECTION 11.03.             No Responsibility for Recitals, Etc.  The recitals contained herein and in the Notes (except in the Trustee’s or the Agent’s certificate of authentication) shall be taken as the statements of the Company, and the Trustee and the Agent assume no responsibility for the correctness of the same. The Trustee and the Agent make no representations as to the validity or sufficiency of this Indenture or of the Notes. Neither the Trustee nor the Agent shall be accountable for the use or application by the Company of any Notes or the proceeds of any Notes authenticated and delivered by the Trustee in conformity with the provisions of this Indenture other than the Authenticating Agent’s certificate of authentication.

SECTION 11.04.             Trustee, Paying Agents, Conversion Agents or Note Registrar May Own Notes.  The Trustee, any Paying Agent, any Conversion Agent or Note Registrar, in its individual or any other capacity, may become the owner or pledgee of Notes with the same rights it would have if it were not the Trustee, Paying Agent, Conversion Agent or Note Registrar.

SECTION 11.05.             Monies to be Held in Trust.  All monies received by the Trustee or the Agent shall, until used or applied as herein provided, be held in trust for the purposes for which they were received. Money held by the Trustee or the Agent in trust hereunder need not be segregated from other funds except to the extent required by law. The Trustee and the Agent shall be under no liability for interest on any money received by it hereunder except as may be agreed in writing from time to time by the Company, the Trustee and the Agent.

SECTION 11.06.             Compensation and Expenses of Trustee and Agent.  The Company covenants and agrees to pay to the Trustee and the Agent from time to time, and the Trustee and the Agent shall be entitled to, such compensation as shall be agreed in writing between the Company and the Trustee or the Agent for all services rendered by them hereunder in any capacity (which shall not be limited by any provision of law in regard to the compensation of a trustee of an express trust), and the Company will pay or reimburse the Trustee and the Agent upon their request for all reasonable expenses, disbursements and advances reasonably incurred or made and reasonably documented by the Trustee and the Agent in accordance with any of the provisions of this Indenture in any capacity thereunder (including the reasonable compensation and the expenses and disbursements of its agents and counsel and of all Persons not regularly in its employ) except any such expense, disbursement or advance as shall have been caused by its gross negligence or intentional misconduct. The Company also covenants to indemnify the Trustee and the Agent in any capacity under this Indenture and any other document or transaction entered into in connection herewith and to protect and hold it harmless against, any and all loss, claim, damage, liability or expense, including taxes (other than taxes based on the income of the Trustee and the Agent), incurred without gross negligence or intentional misconduct on the part of the Trustee or the Agent, as the case may be, and arising out of or in connection with the acceptance or administration of this trust, including the costs and expenses of defending the Trustee or the Agent against any claim (whether asserted by the Company, a Noteholder or any other Person) of liability in the premises. The obligations of the Company under this Section 11.06 to compensate or indemnify the Trustee and the Agent and to pay or reimburse the Trustee and the Agent for expenses, disbursements and advances shall be secured by a senior claim to which the Notes are hereby made subordinate on all money or property held or collected by the Trustee or the Agent, except, subject to the effect of

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Section 5.05, funds held in trust herewith for the benefit of the holders of particular Notes. The Trustee’s or Agent’s right to receive payment of any amounts due under this Section 11.06 shall not be subordinate to any other liability or Indebtedness of the Company (even though the Notes may be so subordinated). The obligations of the Company under this Section 11.06 shall survive the satisfaction and discharge of this Indenture and the earlier resignation or removal or the Trustee or the Agent, as the case may be. The Company need not pay for any settlement made without its consent, which consent shall not be unreasonably withheld. The indemnification provided in this Section 11.06 shall survive the termination or defeasance of this Indenture and the resignation or removal of the Trustee or the Agent, as the case may be. The Trustee or the Agent shall notify the Company promptly of any claim of which a Responsible Officer receives written notice for which it may seek indemnity.

Without prejudice to any other rights available to the Trustee or the Agent under applicable law, when the Trustee, the Agent and their agents and any authenticating agent incur expenses or render services after an Event of Default specified in clauses (i) or (j) of Section 5.01 occurs, the expenses and the compensation for the services are intended to constitute expenses of administration under any bankruptcy, insolvency or similar laws.

SECTION 11.07.             Officers’ Certificate as Evidence.  Except as otherwise provided in Section 11.01, whenever in the administration of the provisions of this Indenture the Trustee or the Agent shall deem it necessary or desirable that a matter be proved or established prior to taking or omitting any action hereunder, such matter (unless other evidence in respect thereof be herein specifically prescribed) may be deemed to be conclusively proved and established by an Officers’ Certificate delivered to the Trustee or the Agent, and such Officers’ Certificate shall be full warrant to the Trustee or the Agent for any action taken or omitted by it under the provisions of this Indenture upon the faith thereof.

SECTION 11.08.             Eligibility of Trustee and Agent.  There shall at all times be a Trustee hereunder that is a corporation organized and doing business under the laws of the United States of America or of any state thereof that is authorized under such laws to exercise corporate trustee power, that is subject to supervision or examination by federal or state authorities and that has a combined capital and surplus of at least $100,000,000 as set forth in its most recent published annual report of condition. If such Person publishes reports of condition at least annually, pursuant to law or to the requirements of any supervising or examining authority, then for the purposes of this Section, the combined capital and surplus of such Person shall be deemed to be its combined capital and surplus as set forth in its most recent report of condition so published. If at any time the Trustee shall cease to be eligible in accordance with the provisions of this Section, it shall resign immediately in the manner and with the effect hereinafter specified in this Article.

SECTION 11.09.             Resignation or Removal of Trustee.

(a)           The Trustee and the Agent (as applicable) may at any time resign by giving written notice of such resignation to the Company and by mailing notice thereof to the Noteholders at their addresses as they shall appear on the Note Register. Upon receiving such notice of resignation, the Company shall promptly appoint a successor trustee or agent (as applicable) by

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written instrument, in duplicate, executed by order of the Board of Directors, one copy of which instrument shall be delivered to the resigning Trustee or Agent (as applicable) and one copy to the successor trustee or agent (as applicable). If no successor trustee or agent (as applicable) shall have been so appointed and have accepted appointment within 60 days after the mailing of such notice of resignation to the Noteholders, the resigning Trustee or Agent (as applicable) may, upon ten Business Days’ notice to the Company and the Noteholders, petition, at the expense of the Company, any court of competent jurisdiction for the appointment of a successor trustee or agent (as applicable), or any Noteholder who has been a bona fide holder of a Note or Notes for at least six months may, subject to the provisions of Section 5.11, on behalf of himself and all others similarly situated, petition any such court for the appointment of a successor trustee or agent (as applicable). Such court may thereupon, after such notice, if any, as it may deem proper and prescribe, appoint a successor trustee or agent (as applicable).

(b)           In case at any time any of the following shall occur:

(i)            the Trustee or Agent (as applicable) shall fail to comply with Section 11.08 within a reasonable time after written request therefor by the Company or by any Noteholder who has been a bona fide holder of a Note or Notes for at least six months, or

(ii)           the Trustee or Agent (as applicable) shall cease to be eligible in accordance with the provisions of Section 11.08 and shall fail to resign after written request therefor by the Company or by any such Noteholder, or

(iii)          the Trustee or Agent (as applicable) shall become incapable of acting, or shall be adjudged a bankrupt or insolvent, or a receiver of the Trustee or of its property shall be appointed, or any public officer shall take charge or control of the Trustee or of its property or affairs for the purpose of rehabilitation, conservation or liquidation, then, in any such case, the Company may by a Board Resolution remove the Trustee or Agent (as applicable) and appoint a successor trustee or agent (as applicable) by written instrument, in duplicate, executed by order of the Board of Directors, one copy of which instrument shall be delivered to the Trustee or Agent so removed and one copy to the successor trustee or agent (as applicable), or, subject to the provisions of Section 5.11, any Noteholder who has been a bona fide holder of a Note or Notes for at least six months may, on behalf of himself and all others similarly situated, petition any court of competent jurisdiction for the removal of the Trustee or Agent (as applicable) and the appointment of a successor trustee or agent (as applicable). Such court may thereupon, after such notice, if any, as it may deem proper and prescribe, remove the Trustee or Agent (as applicable) and appoint a successor trustee or agent (as applicable).

(c)           The holders of a majority in aggregate principal amount of the Notes at the time outstanding, as determined in accordance with Section 12.04, may at any time remove the Trustee or Agent (as applicable) and nominate a successor trustee or agent (as applicable) that shall be deemed appointed as successor trustee or agent (as applicable) unless within ten days after notice to the Company of such nomination the Company objects thereto, in which case the Trustee or Agent (as applicable) so removed or any Noteholder, upon the terms and conditions and otherwise as

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in Section 11.10(a) provided, may petition, at the expense of the Company, any court of competent jurisdiction for an appointment of a successor trustee or agent (as applicable).

(d)                                 Any resignation or removal of the Trustee or Agent (as applicable) and appointment of a successor trustee or agent (as applicable) pursuant to any of the provisions of this Section 11.10 shall become effective upon acceptance of appointment by the successor trustee or agent (as applicable) as provided in Section 11.10.

SECTION 11.10.                                      Acceptance by Successor Trustee or Agent.  Any successor trustee or agent appointed as provided in Section 11.09 shall execute, acknowledge and deliver to the Company and to its predecessor trustee or agent an instrument accepting such appointment hereunder, and thereupon the resignation or removal of the predecessor trustee or agent shall become effective and such successor trustee or agent, without any further act, deed or conveyance, shall become vested with all the rights, powers, duties and obligations of its predecessor hereunder, with like effect as if originally named as trustee or agent herein; but, nevertheless, on the written request of the Company or of the successor trustee or agent, the trustee or agent ceasing to act shall, upon payment of any amounts then due it pursuant to the provisions of Section 11.06, execute and deliver an instrument transferring to such successor trustee or agent all the rights and powers of the trustee or agent so ceasing to act.

Upon the reasonable written request of any such successor trustee or agent, the Company shall execute any and all instruments in writing for more fully and certainly vesting in and confirming to such successor trustee or agent all such rights and powers. Any trustee or Agent ceasing to act shall, nevertheless, retain a senior claim to which the Notes are hereby made subordinate on all money or property held or collected by such trustee or agent as such, except for funds held in trust for the benefit of holders of particular Notes, to secure any amounts then due it pursuant to the provisions of Section 11.06.

No successor trustee or agent shall accept appointment as provided in this Section 11.11 unless at the time of such acceptance such successor trustee or agent shall be qualified under the provisions of Section 11.08 and be eligible under the provisions of Section 11.09.

Upon acceptance of appointment by a successor trustee or agent as provided in this Section 11.10, each of the Company and the successor trustee or agent, at the written direction and at the expense of the Company, shall mail or cause to be mailed notice of the succession of such trustee or agent hereunder to the Noteholders at their addresses as they shall appear on the Note Register. If the Company fails to mail such notice within ten days after acceptance of appointment by the successor trustee or agent, the successor trustee or agent shall cause such notice to be mailed at the expense of the Company.

SECTION 11.11.                                      Succession by Merger, Etc.  Any corporation or other entity into which the Trustee or Agent may be merged or converted or with which it may be consolidated, or any corporation or other entity resulting from any merger, conversion or consolidation to which the Trustee or Agent shall be a party, or any corporation or other entity succeeding to all or substantially all of the corporate trust business of the Trustee or the Agent, as the case may be (including the

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administration of this Indenture), shall be the successor to the Trustee or the Agent hereunder without the execution or filing of any paper or any further act on the part of any of the parties hereto, provided that in the case of any corporation or other entity succeeding to all or substantially all of the corporate trust business of the Trustee or the Agent (as applicable), such corporation or other entity shall be eligible under the provisions of Section 11.08.

In case at the time such successor to the Trustee or the Agent, as the case may be, shall succeed to the trusts created by this Indenture, any of the Notes shall have been authenticated but not delivered, any such successor to the Trustee or Agent may adopt the certificate of authentication of any predecessor authenticating agent, and deliver such Notes so authenticated; and in case at that time any of the Notes shall not have been authenticated, any successor to the Authenticating Agent may authenticate such Notes either in the name of any predecessor trustee or agent hereunder or in the name of the successor trustee or agent; and in all such cases such certificates shall have the full force which it is anywhere in the Notes or in this Indenture provided that the certificate of the Authenticating Agent shall have; provided, however, that the right to adopt the certificate of authentication of any predecessor Authenticating Agent or to authenticate Notes in the name of any predecessor Authenticating Agent shall apply only to its successor or successors by merger, conversion or consolidation.

SECTION 11.12.                                      Trustee’s or Agent’s Application for Instructions from the Company.  Any application by the Trustee or Agent for written instructions from the Company (other than with regard to any action proposed to be taken or omitted to be taken by the Trustee or Agent that affects the rights of the holders of the Notes under this Indenture) may, at the option of the Trustee or the Agent, set forth in writing any action proposed to be taken or omitted by the Trustee or the Agent under this Indenture and the date on and/or after which such action shall be taken or such omission shall be effective. Neither the Trustee nor the Agent shall be liable for any action taken by, or omission of, the Trustee or the Agent, as the case may be, in accordance with a proposal included in such application on or after the date specified in such application (which date shall not be less than three Business Days after the date any officer that the Company has indicated to the Trustee and the Agent should receive such application actually receives such application, unless any such officer shall have consented in writing to any earlier date), unless, prior to taking any such action (or the effective date in the case of any omission), the Trustee and the Agent shall have received written instructions in accordance with this Indenture in response to such application specifying the action to be taken or omitted.

ARTICLE 12

CONCERNING THE NOTEHOLDERS

SECTION 12.01.                                      Action by Noteholders.  Whenever in this Indenture it is provided that the holders of a specified percentage in aggregate principal amount of the Notes may take any action (including the making of any demand or request, the giving of any notice, consent or waiver or the taking of any other action), the fact that at the time of taking any such action, the holders of such specified percentage have joined therein may be evidenced (a) by any instrument or any number of

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instruments of similar tenor executed by Noteholders in person or by agent or proxy appointed in writing, or (b) by the record of the Noteholders voting in favor thereof at any meeting of Noteholders, or (c) by a combination of such instrument or instruments and any such record of such a meeting of Noteholders. Whenever the Company, the Agent or the Trustee solicits the taking of any action by the holders of the Notes, the Company, the Agent or the Trustee may, but shall not be required to, fix in advance of such solicitation, a date as the record date for determining Noteholders entitled to take such action. The record date if one is selected shall be not more than fifteen days prior to the date of commencement of solicitation of such action.

SECTION 12.02.                                      Proof of Execution by Noteholders.  Subject to the provisions of Section 11.01 and Section 11.02, proof of the execution of any instrument by a Noteholder or its agent or proxy shall be sufficient if made in accordance with such reasonable rules and regulations as may be prescribed by the Trustee or the Agent or in such manner as shall be satisfactory to the Trustee or the Agent. The holding of Notes shall be proved by the Note Register or by a certificate of the Note Registrar.

SECTION 12.03.                                      Who Are Deemed Absolute Owners.  The Company, the Trustee, the Agent, any authenticating agent, any Paying Agent, any Conversion Agent and any Note Registrar may deem the Person in whose name a Note shall be registered upon the Note Register to be, and may treat it as, the absolute owner of such Note (whether or not such Note shall be overdue and notwithstanding any notation of ownership or other writing thereon made by any Person other than the Company or any Note Registrar) for the purpose of receiving payment of or on account of the principal of, premium, if any, and (subject to Section 2.03) accrued and unpaid interest on such Note, for conversion of such Note and for all other purposes; and neither the Company nor the Trustee nor any Paying Agent nor any Conversion Agent nor any Note Registrar shall be affected by any notice to the contrary. All such payments so made to any holder for the time being, or upon its order, shall be valid and, to the extent of the sum or sums so paid, effectual to satisfy and discharge the liability for monies payable upon any such Note. Notwithstanding anything to the contrary in this Indenture or the Notes following an Event of Default, any holder of a beneficial interest in a Global Note may directly enforce against the Company, without the consent, solicitation, proxy, authorization or any other action of the Depositary or any other Person, such holder’s right to exchange such beneficial interest for a Note in certificated form in accordance with the provisions of this Indenture.

SECTION 12.04.                                      Company-Owned Notes Disregarded.  In determining whether the holders of the requisite aggregate principal amount of Notes have concurred in any direction, consent, waiver or other action under this Indenture, Notes that are owned by the Company or by any Person directly or indirectly controlling or controlled by or under direct or indirect common control with the Company shall be disregarded and deemed not to be outstanding for the purpose of any such determination; provided that for the purposes of determining whether the Trustee or the Agent shall be protected in relying on any such direction, consent, waiver or other action only Notes that a Responsible Officer actually knows are so owned shall be so disregarded. Notes so owned that have been pledged in good faith may be regarded as outstanding for the purposes of this Section 12.04 if the pledgee shall establish to the satisfaction of the Trustee or the Agent the

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pledgee’s right to so act with respect to such Notes and that the pledgee is not the Company or a Person directly or indirectly controlling or controlled by or under direct or indirect common control with the Company. In the case of a dispute as to such right, any decision by the Trustee or the Agent taken upon the advice of counsel shall be full protection to the Trustee. Upon request of the Trustee, the Company shall furnish to the Trustee or the Agent promptly an Officers’ Certificate listing and identifying all Notes, if any, known by the Company to be owned or held by or for the account of any of the above described Persons; and, subject to Section 11.01, the Trustee or the Agent shall be entitled to accept such Officers’ Certificate as conclusive evidence of the facts therein set forth and of the fact that all Notes not listed therein are outstanding for the purpose of any such determination.

SECTION 12.05.                                      Revocation of Consents; Future Noteholders Bound.  At any time prior to (but not after) the evidencing to the Trustee, as provided in Section 12.01, of the taking of any action by the holders of the percentage in aggregate principal amount of the Notes specified in this Indenture in connection with such action, any holder of a Note that is shown by the evidence to be included in the Notes the holders of which have consented to such action may, by filing written notice with the Trustee and the Agent at their Corporate Trust Office and upon proof of holding as provided in Section 12.02, revoke such action so far as concerns such Note. Except as aforesaid, any such action taken by the holder of any Note shall be conclusive and binding upon such holder and upon all future holders and owners of such Note and of any Notes issued in exchange or substitution therefor or upon registration of transfer thereof, irrespective of whether any notation in regard thereto is made upon such Note or any Note issued in exchange or substitution therefor or upon registration of transfer thereof.

ARTICLE 13

SATISFACTION AND DISCHARGE

SECTION 13.01.                                      Satisfaction and Discharge of the Indenture.  When (i) the Company shall deliver to the Trustee for cancellation all Notes theretofore authenticated (other than any Notes that have been destroyed, lost or stolen and in lieu of or in substitution for which other Notes shall have been authenticated and delivered) and not theretofore canceled, or (ii) all the Notes not theretofore canceled or delivered to the Trustee for cancellation shall have become due and payable (whether at Stated Maturity for the payment of the principal amount thereof or on any Fundamental Change Purchase Date, optional redemption or upon conversion or otherwise or will become due and payable, due to the writing of a Redemption Notice or otherwise, in one year) and the Company shall irrevocably deposit with the Paying Agent, in trust, or deliver to the Holders, as applicable, cash funds and/or (in the case of conversion) shares of Common Stock (subject to the Company’s right to pay cash in lieu thereof), as applicable, sufficient to pay all amounts due or deliverable on all of such Notes (other than any Notes that shall have been mutilated, destroyed, lost or stolen and in lieu of or in substitution for which other Notes shall have been authenticated and delivered) not theretofore canceled or delivered to the Paying Agent for cancellation, including principal and interest due, accompanied, except in the event the Notes are due and payable solely in cash at the Stated Maturity of the Notes or upon an earlier Fundamental Change Purchase Date or upon an optional redemption, by a verification report as to the sufficiency of the deposited amount from an independent certified

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accountant or other financial professional reasonably satisfactory to the Paying Agent (which may include any of the Initial Purchasers), and if the Company shall also pay or cause to be paid all other sums payable hereunder by the Company, then this Indenture shall cease to be of further effect (except as to (A) rights hereunder of Holders of the Notes to receive all amounts owing upon the Notes and the other rights, duties and obligations of Holders of the Notes, as beneficiaries hereof with respect to the amounts, if any, so deposited with the Paying Agent and (B) the rights, obligations and immunities of the Paying Agent hereunder), and the Paying Agent, on written demand of the Company accompanied by an Officers’ Certificate and an Opinion of Counsel stating that all conditions precedent to the satisfaction and discharge of the Indenture have been complied with and at the cost and expense of the Company, shall execute proper instruments acknowledging satisfaction and discharge of this Indenture; the Company, however, hereby agrees to reimburse the Paying Agent for any costs or expenses thereafter reasonably and properly incurred by the Paying Agent, including the fees and expenses of its counsel, and to compensate the Paying Agent for any services thereafter reasonably and properly rendered by the Paying Agent in connection with this Indenture or the Notes. Notwithstanding the satisfaction and discharge of this Indenture, the obligations of the Company to the Agent and the Paying Agent under Section 11.06 shall survive.

SECTION 13.02.                                      Deposit of Monies to be Held in Trust by Trustee.  Subject to Section 13.04, all monies deposited with the Paying Agent pursuant to Section 13.01 shall be held in trust for the sole benefit of the Holders of the Notes, and such monies shall be applied by the Paying Agent to the payment to the Holders of the particular Notes for the payment or redemption of which such monies have been deposited with the Paying Agent, of all sums due and to become due thereon for principal and interest, if any.

SECTION 13.03.                                      Paying Agent to Repay Monies Held.  Upon the satisfaction and discharge of this Indenture, all monies then held by the Paying Agent shall, upon written request of the Company, be repaid to it, and thereupon such Paying Agent shall be released from all further liability with respect to such monies.

SECTION 13.04.                                      Return of Unclaimed Monies.  Subject to the requirements of applicable law, any monies deposited with or paid to the Paying Agent for payment of the principal of or interest, if any, on the Notes and not applied but remaining unclaimed by the Holders of the Notes for two years after the date upon which the principal of or interest, if any, on such Notes, as the case may be, shall have become due and payable, shall be repaid to the Company by the Paying Agent on demand, and all liability of the Paying Agent shall thereupon cease with respect to such monies; and the Holder of any of the Notes shall thereafter look only to the Company for any payment that such Holder of the Notes may be entitled to collect unless an applicable abandoned property law designates another Person.

SECTION 13.05.                                      Reinstatement.  If the Paying Agent is unable to apply any money in accordance with Section 13.02 by reason of any order or judgment of any court or governmental authority enjoining, restraining or otherwise prohibiting such application, the Company’s obligations under the Indenture and the Notes shall be revived and reinstated as though no deposit had occurred pursuant to Section 13.01 until such time as the Paying Agent is permitted to apply all such money

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in accordance with Section 13.02; provided, however, that if the Company makes any payment of interest on or principal of any Note following the reinstatement of its obligations, the Company shall be subrogated to the rights of the Holders of such Notes to receive such payment from the money held by the Paying Agent.

ARTICLE 14

MISCELLANEOUS

SECTION 14.01.                                      Provisions Binding on Company’s Successors.  All the covenants, stipulations, promises and agreements of the Company contained in this Indenture shall bind its successors and assigns whether so expressed or not.

SECTION 14.02.                                      Official Acts by Successor Corporation.  Any act or proceeding by any provision of this Indenture authorized or required to be done or performed by any board, committee or officer of the Company shall and may be done and performed with like force and effect by the like board, committee or officer of any corporation or other entity that shall at the time be the lawful successor of the Company.

SECTION 14.03.                                      Addresses for Notices, Etc.  Any notice or demand that by any provision of this Indenture is required or permitted to be given or served by the Trustee, the Agent or by the Noteholders on the Company shall be deemed to have been sufficiently given or made, for all purposes if given or served by being deposited postage prepaid by registered or certified mail in a post office letter box addressed (until another address is filed by the Company with the Agent and the Trustee) to Proofpoint, Inc., ▇▇▇ ▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇, Attention: General Counsel. Any notice, direction, request or demand hereunder to or upon the Trustee or the Agent shall be deemed to have been sufficiently given or made, for all purposes, if given or served by a facsimile transmission or by being deposited postage prepaid by registered or certified mail in a post office letter box addressed to its Corporate Trust Office. Any notice, direction, request or demand hereunder to or upon the Note Registrar, Paying Agent, Transfer Agent, Authenticating Agent or Conversion Agent shall be deemed to have been sufficiently given or made, for all purposes, if given or served by a facsimile transmission or by being deposited postage prepaid by registered or certified mail in a post office letter box addressed to its Corporate Trust Office.

The Trustee and the Agent, by notice to the Company, may designate additional or different addresses for subsequent notices or communications.

Any notice or communication mailed to a Noteholder shall be mailed to it by first class mail, postage prepaid, at its address as it appears on the Note Register and shall be sufficiently given to it if so mailed within the time prescribed.

Failure to mail a notice or communication to a Noteholder or any defect in it shall not affect its sufficiency with respect to other Noteholders. If a notice or communication is mailed in the manner provided above, it is duly given, whether or not the addressee receives it.

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In case by reason of the suspension of regular mail service or by reason of any other cause it shall be impracticable to give such notice to holders by mail, then such notification as shall be made with the approval of the Trustee or the Agent (as applicable) shall constitute a sufficient notification for every purpose hereunder.

Notwithstanding any other provision of this Indenture or any Note, whenever notice is required to be given to a holder of a Global Note, such notice shall be sufficiently given if given to the Depositary for such Note (or its designee), pursuant to customary procedures of such Depositary.

SECTION 14.04.                                      Governing Law.  THIS INDENTURE AND EACH OF THE NOTES SHALL BE GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.

SECTION 14.05.                                      Evidence of Compliance with Conditions Precedent; Certificates and Opinions of Counsel to Trustee and Agent.

(a)                                 Upon any request or application by the Company to the Trustee or the Agent to take any action under this Indenture, the Company shall furnish to the Trustee and the Agent:

(i)                       an Officers’ Certificate stating that, in the opinion of the signers, all conditions precedent, if any, provided for in this Indenture relating to the proposed action have been complied with; and

(ii)                    an Opinion of Counsel stating that, in the opinion of such counsel, all such conditions precedent have been complied with.

(b)                                 Each certificate or opinion with respect to compliance with a condition or covenant provided for in this Indenture shall include:

(i)                       a statement that each person signing such certificate or opinion has read such covenant or condition and the definitions herein relating thereto;

(ii)                    a brief statement as to the nature and scope of the examination or investigation upon which the statement or opinion contained in such certificate or opinion is based;

(iii)                 a statement that, in the opinion of each such person, the person has made such examination or investigation as is necessary to enable the person to express an informed opinion as to whether or not such covenant or condition has been complied with; and

(iv)                a statement as to whether or not, in the opinion of each such person, such condition or covenant has been complied with; provided, however, that, with respect to matters of fact, an Opinion of Counsel may rely on an Officers’ Certificate or certificates of public officials.

Notwithstanding anything to the contrary in this Section 14.05, (i) if any provision in this Indenture specifically provides that the Trustee or Agent shall or may receive an Opinion of Counsel in connection with any action to be taken by the Trustee, the Agent, or the Company hereunder, the

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Trustee or the Agent, as applicable, shall be entitled to, or entitled to request, such Opinion of Counsel.

SECTION 14.06.                                      Payments on Business Days.  If any Interest Payment Date or the Stated Maturity of the Notes or any earlier required repurchase date would fall on a day that is not a Business Day, the required payment shall be made on the next succeeding Business Day and no interest on such payment shall accrue in respect of the delay.

SECTION 14.07.                                      No Security Interest Created.  Nothing in this Indenture or in the Notes, expressed or implied, shall be construed to constitute a security interest under the Uniform Commercial Code or similar legislation, as now or hereafter enacted and in effect, in any jurisdiction.

SECTION 14.08.                                      [Reserved].

SECTION 14.09.                                      Benefits of Indenture.  Nothing in this Indenture or in the Notes, expressed or implied, shall give to any Person, other than the parties hereto, any Paying Agent, any Conversion Agent, any Bid Solicitation Agent, any authenticating agent, any Note Registrar and their successors hereunder or the Holders of the Notes, any benefit or any legal or equitable right, remedy or claim under this Indenture.

SECTION 14.10.                                      Authenticating Agent.  The Agent shall appoint an authenticating agent (together with its successors, assigns and validly appointed replacements, the “Authenticating Agent”) that shall be authorized to act on its behalf and subject to its direction in the authentication and delivery of Notes in connection with the original issuance thereof and transfers and exchanges of Notes hereunder, including under Section 2.05, Section 2.06, Section 2.07, Section 2.08, Section 3.04 and Section 7.04 as fully to all intents and purposes as though the authenticating agent had been expressly authorized by this Indenture and those Sections to authenticate and deliver Notes. For all purposes of this Indenture, the authentication and delivery of Notes by the authenticating agent shall be deemed to be authentication and delivery of such Notes “by the Agent” and a certificate of authentication executed on behalf of the Agent by an authenticating agent shall be deemed to satisfy any requirement hereunder or in the Notes for the Agent’s certificate of authentication. Such authenticating agent shall at all times be a Person eligible to serve as trustee hereunder pursuant to Section 11.08. The Agent initially appoints the Trustee as Authenticating Agent.

Any corporation or other entity into which any authenticating agent may be merged or converted or with which it may be consolidated, or any corporation or other entity resulting from any merger, consolidation or conversion to which any authenticating agent shall be a party, or any corporation or other entity succeeding to all or substantially all the corporate trust business of any authenticating agent, shall be the successor of the authenticating agent hereunder, if such successor corporation or other entity is otherwise eligible under this Section, without the execution or filing of any paper or any further act on the part of the parties hereto or the authenticating agent or such successor corporation or other entity.

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Any authenticating agent may at any time resign by giving written notice of resignation to the Trustee, the Agent and to the Company. The Agent may at any time terminate the agency of any authenticating agent by giving written notice of termination to such authenticating agent and to the Company. Upon receiving such a notice of resignation or upon such a termination, or in case at any time any authenticating agent shall cease to be eligible under this Section, the Agent may appoint a successor authenticating agent, shall give written notice of such appointment to the Company and shall mail notice of such appointment to all Noteholders as the names and addresses of such holders appear on the Note Register.

The Company agrees to pay to the authenticating agent from time to time reasonable compensation for its services although the Company may terminate the authenticating agent, if it determines such agent’s fees to be unreasonable.

The provisions of Section 11.02, Section 11.03, Section 11.04, Section 12.03 and this Section 14.10 shall be applicable to any authenticating agent.

SECTION 14.11.                                      Calculations.  Except as otherwise provided in this Indenture, the Company shall be responsible for making all calculations called for under the Notes. These calculations include, but are not limited to, determinations of any Last Reported Sale Price of the Common Stock, the Daily VWAP, accrued interest payable on the Notes and the Conversion Rate. The Company shall make all these calculations in good faith and, absent manifest error, the Company’s calculations shall be final and binding on Holders of Notes. The Company shall provide a schedule of its calculations to each of the Trustee, the Agent and the Conversion Agent (if different than the Trustee), and each of the Trustee, the Agent and Conversion Agent (if different than the Trustee) is entitled to rely conclusively upon the accuracy of the Company’s calculations without independent verification. The Trustee or the Paying Agent will forward the Company’s calculations to any Holder of Notes upon the written request of that Holder at the sole cost and expense of the Company.

SECTION 14.12.                                      Rules by Trustee, Paying Agent and Note Registrar.  The Trustee may make reasonable rules for action by, or a meeting of, Holders. The Note Registrar and the Paying Agent may make reasonable rules for their functions.

SECTION 14.13.                                      Table of Contents, Headings, Etc.  The table of contents and the titles and headings of the articles and sections of this 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 14.14.                                      Execution in Counterparts.  This Indenture may be executed in any number of counterparts, each of which shall be an original, but such counterparts shall together constitute but one and the same instrument.  The exchange of copies of this Indenture and of signature pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Indenture as to the parties hereto and may be used in lieu of the original

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Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes.

SECTION 14.15.                                      Severability.  In the event any provision of this Indenture or in the Notes shall be invalid, illegal or unenforceable, then (to the extent permitted by law) the validity, legality or enforceability of the remaining provisions shall not in any way be affected or impaired.

SECTION 14.16.                                      No Recourse Against Others.  No director, officer, employee, stockholder, incorporator or agent of the Company will have any liability for any obligations of the Company under the Notes, the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of the Notes by accepting a Note waives and releases all such liability.

SECTION 14.17.                                      Waiver of Jury Trial.  EACH OF THE COMPANY AND THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS INDENTURE, THE NOTES OR THE TRANSACTION CONTEMPLATED HEREBY.

SECTION 14.18.                                      Force Majeure.  In no event shall the Trustee or the Agent be responsible or liable for any failure or delay in the performance of its obligations hereunder arising out of or caused by, directly or indirectly, forces beyond its control, including, without limitation, strikes, work stoppages, accidents, acts of war or terrorism, civil or military disturbances, nuclear or natural catastrophes or acts of God, and interruptions, loss or malfunctions of utilities, communications or computer (software and hardware) services; it being understood that the Trustee and the Agent shall use reasonable efforts that are consistent with accepted practices in the banking industry to resume performance as soon as practicable under the circumstances.

SECTION 14.19.                                      U.S.A. Patriot Act.

The parties hereto acknowledge that in accordance with Section 326 of the U.S.A. Patriot Act, the Trustee, like all financial institutions and in order to help fight the funding of terrorism and money laundering, is required to obtain, verify, and record information that identifies each person or legal entity that establishes a relationship or opens an account with the Trustee.  The parties to this Indenture agree that they will provide the Trustee with such information as it may request in order for the Trustee to satisfy the requirements of the U.S.A. Patriot Act.

ARTICLE 15

REDEMPTION

SECTION 15.01.                                      Right to Redeem.  The Notes shall not be redeemable before June 20, 2018, and no sinking fund is provided for the Notes. On or after such date, the Company shall be entitled to redeem the Notes at its option, in whole or in part, provided that the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive)

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during the period of 30 consecutive trading days ending within 10 trading days immediately prior to the date of the Redemption Notice exceeds 130% of the applicable Conversion Price for the Notes on each applicable trading day as determined by the Company. The redemption price for the Notes to be redeemed on any Redemption Date (the “Redemption Price”) will equal (a) 100% of the principal amount of the Notes being redeemed plus (b) accrued and unpaid interest (including Additional Interest), if any, to, but excluding, the Redemption Date, unless the Redemption Date falls after a record date but on or prior to the immediately succeeding interest payment date, in which case the Company shall instead pay the full amount of accrued and unpaid interest, including any Additional Interest, to the Holder of record as of the close of business on such record date. If Notes are redeemed on a date that is after a Regular Record Date for the payment of interest and on or prior to the corresponding Interest Payment Date, accrued and unpaid interest will not be paid to the Holder of Notes being redeemed, and instead the full amount of the relevant interest payment will be paid on such interest payment date to the Holder of record on such Regular Record Date.

SECTION 15.02.                                      Notices to Trustee.  If the Company elects to redeem Notes pursuant to the optional redemption provisions of the Notes, it shall notify the Trustee in writing of the Redemption Date, the principal amount of Notes to be redeemed and the paragraph of the Notes pursuant to which the redemption will occur.

The Company shall give each notice to the Trustee provided for in this Section at least 35 days (or such longer notice period as required by Section 15.04) before the Redemption Date unless the Trustee consents to a shorter period; provided, however, that if the Company mails a Redemption Notice to Holders more than 30 days prior to the Redemption Date, in accordance with Section 15.05 hereto, the Company shall immediately give notice to the Trustee. Such notice shall be accompanied by an Officers’ Certificate and an Opinion of Counsel from the Company to the effect that such redemption will comply with the conditions herein.

SECTION 15.03.                                      Selection of Notes to Be Redeemed.  In the event that the Company chooses to redeem less than all of the Notes at any time, selection of the Notes for redemption shall be made by the Trustee by lot or by such method as the Trustee shall deem fair and appropriate in accordance with DTC procedures. The Trustee shall make the selection from outstanding Notes not previously called for redemption. Notes and portions of them the Trustee selects shall be in principal amounts of $1,000 or multiples of $1,000. Provisions of this Indenture that apply to Notes called for redemption also apply to portions of Notes called for redemption. The Trustee shall notify the Company promptly of the Notes or portions of Notes to be redeemed.

SECTION 15.04.                                      Notice of Redemption.  At least 30 days (or such longer notice period as required to provide that there is a sufficient number of Trading Days between the Redemption Notice and the Redemption Date (the “Redemption Period”) such that the entire Conversion Redemption Observation Period occurs within such Redemption Period and such Redemption Notice is delivered by the Company at least two Trading Days prior to the commencement of the related Conversion Redemption Observation Period) but not more than 60 days before a date for redemption of Notes, the Company shall mail a notice of redemption (a “Redemption Notice”) by first-class mail or electronic transmission to each Holder of Notes to be redeemed at such Holder’s registered

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address, except that Redemption Notices may be mailed more than 60 days prior to the Redemption Date if the notice is issued in connection with a defeasance of the Notes or a satisfaction and discharge of this Indenture. Any inadvertent defect in the Redemption Notice, including an inadvertent failure to give notice, to any Holder selected for redemption shall not impair or affect the validity of the redemption of any other Note redeemed in accordance with provisions of this Indenture. Simultaneously with providing such Redemption Notice, the Company shall issue a press release or publish a notice containing the information included therein or shall publish such information on the Company’s website or through such other public medium as the Company may use at such time.

The notice shall identify the Notes to be redeemed and shall state:

(i)                                     the Redemption Date;

(ii)                                  the Redemption Price;

(iii)                               the name and address of the Paying Agent;

(iv)                              that Notes called for redemption must be surrendered to the Paying Agent to collect the Redemption Price;

(v)                                 if fewer than all the outstanding Notes are to be redeemed, the identification and principal amounts of the particular Notes to be redeemed;

(vi)                              that, unless the Company defaults in making such redemption payment, interest on Notes (or portion thereof) called for redemption ceases to accrue on and after the Redemption Date;

(vii)                           the “CUSIP” number, ISIN or “Common Code” number, if any, printed on the Notes being redeemed;

(viii)                        that no representation is made as to the correctness or accuracy of the “CUSIP” number, ISIN, or “Common Code” number, if any, listed in such notice or printed on the Notes;

(ix)                              that such Holder has a right to convert the Notes called for redemption upon satisfaction of the requirements therefor set in the Indenture, and the conversion rate applicable to such conversion, including any Additional Shares to be received upon conversion of the Notes in connection with such Redemption Notice pursuant to Section 4.06; and

(x)                                 the time at which such Holders’ right to convert the Notes called for redemption will expire, which will be the close of business on the Business Day immediately preceding the Redemption Date.

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At the Company’s request (which request must be made at least 35 days prior to the Redemption Date), the Trustee shall give the Redemption Notice in the Company’s name and at the Company’s expense. In such event, the Company shall provide the Trustee with the information required by this Section.

SECTION 15.05.                                      Effect of Redemption Notice.  Once a Redemption Notice is mailed, Notes called for redemption become due and payable on the Redemption Date and at the Redemption Price stated in the Redemption Notice. Upon surrender to the Paying Agent, such Notes shall be paid at the Redemption Price stated in the Redemption Notice, plus accrued interest to the Redemption Date (subject to the right of Holders of record on the relevant record date to receive interest due on the related interest payment date), and such Notes shall be canceled by the Paying Agent. Failure to give notice or any defect in the notice to any Holder shall not affect the validity of the notice to any other Holder.

SECTION 15.06.                                      Deposit of Redemption Price.  Prior to 10:00 a.m. (local time in The City of New York) on the Redemption Date, the Company shall deposit with the Paying Agent (or, if the Company or a Subsidiary is the Paying Agent, shall segregate and hold in trust) money sufficient to pay the Redemption Price of and accrued interest on all Notes to be redeemed on that date other than Notes or portions of Notes called for redemption which have been delivered by the Company to the Paying Agent for cancellation.

SECTION 15.07.                                      Notes Redeemed in Part.  If a portion of Notes are selected for redemption and a Holder converts a portion of those Notes, the converted portion will be deemed to be of the portion selected for redemption to the extent that the converted portion does not exceed the portion selected for redemption.  Upon surrender of a Note that is redeemed in part, the Company shall execute and the Authenticating Agent shall authenticate for the Holder (at the Company’s expense) a new Note equal in principal amount to the unredeemed portion of the Note surrendered.

SECTION 15.08.                                      Effect of Redemptions in Part.  In the event of any redemption in part, the Company shall not be required to (i) issue, register the transfer of or exchange any notes during a period beginning at the open of business 15 days before the mailing of a Redemption Notice and ending at the close of business on the earliest date on which the relevant Redemption Notice is deemed to have been given to all Holders of Notes to be redeemed or (ii) register the transfer of or exchange any Notes so selected for redemption, in whole or in part, except the unredeemed portion of any Notes being redeemed in part.

SECTION 15.09.                                      Conditions to Redemption.  No Notes may be redeemed if the principal amount of the Notes has been accelerated, and such acceleration has not been rescinded, on or prior to the Redemption Date (except in the case of an acceleration resulting from a default by us in the payment of the applicable Redemption Price with respect to such Notes).

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IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be duly executed as of the day and year first above written.

[Indenture Signature Page]

[Indenture Signature Page]

SCHEDULE A

The following table sets forth the amount, if any, by which the Conversion Rate per $1,000 principal amount of Notes will increase pursuant to Section 4.06 of this Indenture for each Stock Price and Effective Date set forth below:

EXHIBIT A

[FORM OF FACE OF GLOBAL NOTE]

THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE OF A DEPOSITARY. THIS NOTE IS EXCHANGEABLE FOR NOTES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND NO TRANSFER OF THIS NOTE (OTHER THAN A TRANSFER OF THIS NOTE AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY) MAY BE REGISTERED EXCEPT IN LIMITED CIRCUMSTANCES.

UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY NOTE 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 HEREON 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.

THIS NOTE AND THE COMMON STOCK, IF ANY, ISSUABLE UPON CONVERSION OF THIS NOTE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED PRIOR TO THE RESALE RESTRICTION TERMINATION DATE EXCEPT:

(A)                               TO THE COMPANY OR ANY SUBSIDIARY THEREOF, OR

(B)                               PURSUANT TO A REGISTRATION STATEMENT WHICH HAS BECOME EFFECTIVE UNDER THE SECURITIES ACT, OR

(C)                               TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, OR

(D)                               PURSUANT TO AN EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT OR ANY OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT.

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PRIOR TO THE REGISTRATION OF ANY TRANSFER IN ACCORDANCE WITH CLAUSE (D) ABOVE, THE COMPANY, THE TRUSTEE, AND THE PAYING AGENT RESERVE THE RIGHT TO REQUIRE THE DELIVERY OF SUCH LEGAL OPINIONS, CERTIFICATIONS OR OTHER EVIDENCE AS MAY REASONABLY BE REQUIRED IN ORDER TO DETERMINE THAT THE PROPOSED TRANSFER IS BEING MADE IN COMPLIANCE WITH THE SECURITIES ACT AND APPLICABLE STATE SECURITIES LAWS. NO REPRESENTATION IS MADE AS TO THE AVAILABILITY OF ANY EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT.

THE “RESALE RESTRICTION TERMINATION DATE” MEANS THE LATER OF: (A) THE DATE THAT IS ONE YEAR AFTER THE LAST ORIGINAL ISSUANCE DATE OF THE NOTES OR SUCH SHORTER PERIOD OF TIME PERMITTED BY RULE 144 UNDER THE SECURITIES ACT OR ANY SUCCESSOR PROVISION THERETO; AND (B) SUCH LATER DATE, IF ANY, AS MAY BE REQUIRED BY APPLICABLE LAW.

PROOFPOINT, INC.

0.75% Senior Convertible Note due 2020

CUSIP No. [               ]

Proofpoint, Inc., a Delaware corporation (herein called the “Company”, which term includes any successor Person under the Indenture hereinafter referred to), for value received, hereby promises to pay CEDE & CO., or registered assigns, [                    ] DOLLARS ($[        ]) (or such greater or lesser principal amount as shall be specified in the “Schedule of Exchanges of Securities” attached hereto) on June 15, 2020 unless earlier converted or repurchased, and to pay interest thereon as set forth in the manner, at the rates and to the Persons set forth in the Indenture.

This Note shall bear interest at a rate of 0.75% per annum from June 17, 2015 or from the most recent date to which interest had been paid or provided to, but excluding, the next scheduled Interest Payment Date, until the principal hereof shall be repaid. Interest on this Note will be computed on the basis of a 360-day year composed of twelve 30-day months. Interest is payable semi-annually in arrears on each June 15 and December 15, commencing on December 15, 2015, 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. Additional Interest will be payable at the option of the Company on the terms set forth in Section 5.02 of the within-mentioned Indenture.

The Company will pay interest on overdue principal, and, to the extent lawful, on overdue interest, in each case at a rate of 0.75% per annum. Interest not paid when due and any interest on principal or interest not paid when due will be paid to Holders on a special record date, which will be the 15th day preceding the date fixed by the Company for the payment of such interest, whether or not such day is a Business Day. At least 15 days before a special record date, the Company will send

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to each Holder and to the Paying Agent a notice that sets forth the special record date, the payment date and the amount of interest to be paid.

The Company shall pay principal of and interest on this Note, so long as such Note is a Global Note, in immediately available funds to the Depositary or its nominee, as the case may be, as the registered Holder of such Note. The Company shall pay principal of any Notes (other than Notes that are Global Notes) at the office or agency designated by the Company for that purpose. The Company has initially designated the Trustee as its Paying Agent and Note Registrar in respect of the Notes and its agency in Minneapolis, Minnesota as a place where Notes may be presented for payment or for registration of transfer. The Company may, however, change the Paying Agent or Note Registrar for the Notes without prior notice to the Holders thereof, and the Company may act as Paying Agent or Note Registrar. Interest on the Notes (other than Notes that are Global Notes) will be payable (i) to Holders holding Notes in an aggregate principal amount of $1,000,000 or less, by check mailed to such Holder and (ii) to Holders holding Notes in an aggregate principal amount of $1,000,000 or more, by wire transfer in immediately available funds to that Holder’s account within the United States, which application shall remain in effect until that Holder notifies, in writing, the Note Registrar to the contrary.

Reference is hereby made to the further provisions of this Note set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place.

In the case of any conflict between this Note and the Indenture, the provisions of the Indenture shall control. This Note, for all purposes, shall be governed by and construed in accordance with the laws of the State of New York.

Unless the certificate of authentication hereon has been executed by the Authenticating Agent referred to on the reverse hereof by manual signature, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

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IN WITNESS WHEREOF, PROOFPOINT, INC. has caused this instrument to be signed manually or by facsimile by its duly authorized officer.

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CERTIFICATE OF AUTHENTICATION

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

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[FORM OF REVERSE OF GLOBAL NOTE]

PROOFPOINT, INC.

0.75% Senior Convertible Note due 2020

This Note is one of a duly authorized issue of Securities of the Company (herein called the “Notes”), issued under and pursuant to an Indenture dated as of June 17, 2015 (herein called the “Indenture”) by and among the Company, ▇▇▇▇▇ Fargo Bank, National Association, herein called the “Trustee” and as Note Registrar, Paying Agent, Transfer Agent, Authenticating Agent and Conversion Agent (the “Agent”), and reference is hereby made to the Indenture for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee, the Note Registrar, the Paying Agent, the Transfer Agent, the Authenticating Agent, the Conversion Agent and the Holders of the Notes and of the terms upon which the Notes are, and are to be, authenticated and delivered. Additional Notes may be issued in an unlimited aggregate principal amount, subject to certain conditions specified in the Indenture.

As provided in and subject to the provisions of the Indenture, upon the occurrence of a Fundamental Change, the Holder has the right, at such Holder’s option, to require the Company to repurchase all of such Holder’s Notes or any portion thereof (in principal amounts of $1,000 or integral multiples thereof) on the Fundamental Change Purchase Date at a price equal to the Fundamental Change Purchase Price.

Except as described below, the Notes shall not be redeemable before June 20, 2018, and no sinking fund is provided for the Notes. On or after such date, the Company shall be entitled to redeem the Notes at its option, in whole or in part, provided that the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending within 10 trading days immediately prior to the date of the Redemption Notice exceeds 130% of the applicable conversion price for the notes on each applicable trading day as determined by the Company. The Redemption Price for the Notes to be redeemed on any Redemption Date will equal (a) 100% of the principal amount of the Notes being redeemed plus (b) accrued and unpaid interest (including Additional Interest), if any, to, but excluding, the Redemption Date, unless the Redemption Date falls after a record date but on or prior to the immediately succeeding interest payment date, in which case we will instead pay the full amount of accrued and unpaid interest, including any Additional Interest, to the Holder of record as of the close of business on such record date. If Notes are redeemed on a date that is after a Regular Record Date for the payment of interest and on or prior to the corresponding Interest Payment Date, accrued and unpaid interest will not be paid to the Holder of Notes being redeemed, and instead the full amount of the relevant interest payment will be paid on such interest payment date to the Holder of record on such Regular Record Date.  If the Company elects to redeem all or part of the Notes on or after June 20, 2018, it will increase the Conversion Rate for Holders who convert Notes in connection with such redemption as set forth in the Indenture.

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Notice will be given not less than 30 (or such longer notice period such that the entire Conversion Redemption Observation Period occurs within the Redemption Period and such Redemption Notice is delivered by the Company at least two Trading Days prior to the commencement of the related Conversion Redemption Observation Period) nor more than 60 days prior to the Redemption Date, and such notice will state, among other things: (a) that such Holder has a right to convert the Notes called for redemption upon satisfaction of the requirements therefor set forth in the Indenture, and the conversion rate applicable to such conversion, including any Additional Shares to be received upon conversion of the Notes in connection with such Redemption Notice as provided in Section 4.06 of the Indenture; and (b) the time at which such Holder’s right to convert the Notes called for redemption will expire, which will be the close of business on the Business Day immediately preceding the Redemption Date. Any inadvertent defect in the Redemption Notice, including an inadvertent failure to give notice, to any Holder selected for redemption will not impair or affect the validity of the redemption of any other Note redeemed in accordance with provisions of the Indenture.

As provided in and subject to the provisions of the Indenture, the Holder hereof has the right, at its option, during certain periods and upon the occurrence of certain conditions specified in the Indenture, prior to the close of business on the second Scheduled Trading Day immediately preceding June 15, 2020, to convert this Note or a portion thereof that is $1,000 or an integral multiple thereof, into cash, shares of Common Stock or a combination thereof, at the Company’s discretion, at the applicable Conversion Rate specified in the Indenture, as adjusted from time to time as provided in the Indenture.

As provided in and subject to the provisions of the Indenture, the Company will make all payments and deliveries in respect of the Fundamental Change Purchase Price, Redemption Price and the principal amount of the Notes on the Stated Maturity thereof, as the case may be, to the holder who surrenders a Note to the Paying Agent to collect such payments in respect of the Note. The Company will pay cash amounts in money of the United States that at the time of payment is legal tender for payment of public and private debts.

The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Notes to be effected under the Indenture at any time by the Company, the Agent and the Trustee with the consent of the Holders of a majority in principal amount of the Notes at the time outstanding. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Notes at the time outstanding, on behalf of the Holders of all Notes, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Note shall be conclusive and binding upon such Holder and upon all future Holders of this Note and of any Note issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note.

As provided in and subject to the provisions of the Indenture, in case an Event of Default, as defined in the Indenture, shall have occurred and be continuing, the principal of and interest on all

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Notes may be declared due and payable, by either the Trustee or Holders of not less than 25% in aggregate principal amount of Notes then outstanding, and upon said declaration shall become due and payable, in the manner, with the effect and subject to the conditions provided in the Indenture; provided that upon the occurrence of an Event of Default specified in clauses (i) and (j) of Section 5.01 of the Indenture, the principal amount of, and interest on, all the Notes shall automatically become due and payable.

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 and any premium and interest on this Note at the time, place and rate, and in the coin and currency, herein prescribed.

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Note is registrable in the Note Register, upon surrender of this Note for registration of transfer at the office or agency of the Company in any place where the principal of and interest on this Note are payable, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Note Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Notes of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees.

The Notes are issuable only in registered form without coupons in denominations of $1,000 and any integral multiple thereof. As provided in the Indenture and subject to certain limitations therein set forth, the Notes are exchangeable for a like aggregate principal amount of Notes and of like tenor of a different authorized denomination, as requested by the Holder surrendering the same.

No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or other similar governmental charge required by laws or payable in connection therewith.

Prior to due presentment of this Note for registration of transfer, the Company, the Agent, the Trustee and any agent of the Company or Trustee may treat the Person in whose name the Note is registered as the owner hereof for all purposes, whether or not this Note be overdue, and neither the Company, the Agent, the Trustee nor any such agent shall be affected by notice to the contrary.

All defined terms used in this Note that are defined in the Indenture shall have the meanings assigned to them in the Indenture.

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ABBREVIATIONS

Customary abbreviations may be used in the name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian) and U/G/M/A/ (= Uniform Gifts to Minors Act).

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

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SCHEDULE A

SCHEDULE OF EXCHANGES OF SECURITIES

PROOFPOINT, INC.

0.75% Senior Convertible Notes due 2020

The initial principal amount of this Global Note is [                    ] DOLLARS ($[        ]). The following, exchanges, purchases or conversions of a part of this Global Note have been made:

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EXHIBIT B

[FORM OF NOTICE OF CONVERSION]

To:    Proofpoint, Inc. and ▇▇▇▇▇ Fargo Bank, National Association

The undersigned owner of this Note hereby irrevocably exercises the option to convert this Note, or a portion hereof (which is $1,000 or an integral multiple hereof) below designated, into cash, shares of Common Stock or a combination thereof, at the Company’s discretion, in accordance with the terms of the Indenture referred to in this Note, and directs that any cash payable and any shares of Common Stock issuable and deliverable upon conversion, together with any check in payment for fractional shares of Common Stock, and any Notes representing any unconverted principal amount hereof, be paid or issued and delivered, as the case may be, to the registered Holder hereof unless a different name has been indicated below. Subject to certain exceptions set forth in the Indenture, if this notice is being delivered on a date after the close of business on a Regular Record Date and prior to the open of business on the related Interest Payment Date, this notice is accompanied by payment of an amount equal to the interest payable on such Interest Payment Date of the principal of this Note to be converted. If any shares of Common Stock are to be issued in the name of a Person other than the undersigned, the undersigned will pay all transfer taxes payable with respect hereto. Any amount required to be paid by the undersigned on account of interest accompanies this Note.

Principal amount to be converted (in an integral multiple of $1,000, if less than all):

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Fill in for registration of any shares of Common Stock and Notes if to be issued otherwise than to the registered Holder.

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EXHIBIT C

[FORM OF FUNDAMENTAL CHANGE PURCHASE NOTICE]

To:    Proofpoint, Inc. and ▇▇▇▇▇ Fargo Bank, National Association

The undersigned registered owner of this Note hereby acknowledges receipt of a notice from Proofpoint, Inc. (the “Company”) as to the occurrence of a Fundamental Change with respect to the Company and specifying the Fundamental Change Purchase Date and requests and instructs the Company to repay to the registered holder hereof in accordance with the applicable provisions of this Note and the Indenture referred to in this Note (1) the entire principal amount of this Note, or the portion thereof (that is $1,000 principal amount or an integral multiple thereof) below designated, and (2) if such Fundamental Change Purchase Date does not fall during the period after a Regular Record Date and on or prior to the corresponding Interest Payment Date, accrued and unpaid interest thereon to, but excluding, such Fundamental Change Purchase Date.

In the case of certificated Notes, the certificate numbers of the Notes to be repurchased are as set forth below:

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EXHIBIT D

[FORM OF ASSIGNMENT AND TRANSFER]

For value received                      hereby sell(s), assign(s) and transfer(s) unto                      (Please insert social security or Taxpayer Identification Number of assignee) the within Note, and hereby irrevocably constitutes and appoints                      to transfer the said Note on the books of the Company, with full power of substitution in the premises.