Exhibit 4.1


 


EXECUTION VERSION


 


 









PLUG POWER INC.





AND







WILMINGTON TRUST, NATIONAL ASSOCIATION,







as Trustee







INDENTURE







Dated as of May 18, 2020


 


3.75% Convertible Senior Notes due 2025


 


 








     


     


    




 


             TABLE
OF CONTENTS            


 




Page




	Article 1 

Definitions
	Section 1.01 .  Definitions	1
	Section 1.02 .  References to Interest	14
	Article 2 

Issue, Description, Execution, Registration and Exchange of Notes
	Section 2.01 .  Designation and Amount	14
	Section 2.02 .  Form of Notes	14
	Section 2.03 .  Date and Denomination of Notes; Payments of Interest and Defaulted Amounts	15
	Section 2.04 .  Execution, Authentication and Delivery of Notes	16
	Section 2.05 .  Exchange and Registration of Transfer of Notes; Restrictions on Transfer; Depositary	17
	Section 2.06 .  Mutilated, Destroyed, Lost or Stolen Notes	24
	Section 2.07 .  Temporary Notes	25
	Section 2.08 .  Cancellation of Notes Paid, Converted, Etc.	26
	Section 2.09 .  CUSIP Numbers	26
	Section 2.10 .  Additional Notes; Repurchases	26
	Article 3 

Satisfaction and Discharge
	Section 3.01 .  Satisfaction and Discharge	27
	Article 4 

Particular Covenants of the Company
	Section 4.01 .  Payment of Principal and Interest	27
	Section 4.02 .  Maintenance of Office or Agency	28
	Section 4.03 .  Appointments to Fill Vacancies in Trustee’s Office	28
	Section 4.04 .  Provisions as to Paying Agent	28
	Section 4.05 .  Existence	30
	Section 4.06 .  Rule 144A Information Requirement and Annual Reports	30
	Section 4.07 .  Stay, Extension and Usury Laws	32
	Section 4.08 .  Compliance Certificate; Statements as to Defaults	32
	Section 4.09 .  Further Instruments and Acts	32



 


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	Article 5 

Lists of Holders and Reports by the Company and the Trustee
	Section 5.01 .  Lists of Holders	32
	Section 5.02 .  Preservation and Disclosure of Lists	33
	Article 6 

Defaults and Remedies
	Section 6.01 .  Events of Default	33
	Section 6.02 .  Acceleration; Rescission and Annulment	34
	Section 6.03 .  Additional Interest	35
	Section 6.04 .  Payments of Notes on Default; Suit Therefor	36
	Section 6.05 .  Application of Monies Collected by Trustee	38
	Section 6.06 .  Proceedings by Holders	39
	Section 6.07 .  Proceedings by Trustee	40
	Section 6.08 .  Remedies Cumulative and Continuing	40
	Section 6.09 .  Direction of Proceedings and Waiver of Defaults by Majority of Holders	40
	Section 6.10 .  Notice of Defaults	41
	Section 6.11 .  Undertaking to Pay Costs	41
	Article 7

 Concerning the Trustee
	Section 7.01 .  Duties and Responsibilities of Trustee	42
	Section 7.02 .  Reliance on Documents, Opinions, Etc	43
	Section 7.03 .  No Responsibility for Recitals, Etc	45
	Section 7.04 .  Trustee, Paying Agents, Conversion Agents, Bid Solicitation Agent or Note Registrar May Own Notes	45
	Section 7.05 .  Monies to Be Held in Trust	45
	Section 7.06 .  Compensation and Expenses of Trustee	45
	Section 7.07 .  Officer’s Certificate as Evidence	46
	Section 7.08 .  Eligibility of Trustee	47
	Section 7.09 .  Resignation or Removal of Trustee	47
	Section 7.10 .  Acceptance by Successor Trustee	48
	Section 7.11 .  Succession by Merger, Etc	48
	Section 7.12 .  Trustee’s Application for Instructions from the Company	49
	Article 8

 Concerning the Holders
	Section 8.01 .  Action by Holders	49
	Section 8.02 .  Proof of Execution by Holders	50
	Section 8.03 .  Who Are Deemed Absolute Owners	50






	Section 8.04 .  Company-Owned Notes Disregarded	50
	Section 8.05 .  Revocation of Consents; Future Holders Bound	51



 


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	Article 9

 Holders’ Meetings
	Section 9.01 .  Purpose of Meetings	51
	Section 9.02 .  Call of Meetings by Trustee	52
	Section 9.03 .  Call of Meetings by Company or Holders	52
	Section 9.04 .  Qualifications for Voting	52
	Section 9.05 .  Regulations	52
	Section 9.06 .  Voting	53
	Section 9.07 .  No Delay of Rights by Meeting	53
	Article 10 

Supplemental Indentures
	Section 10.01 .  Supplemental Indentures Without Consent of Holders	53
	Section 10.02 .  Supplemental Indentures with Consent of Holders	55
	Section 10.03 .  Effect of Supplemental Indentures	56
	Section 10.04 .  Notation on Notes	56
	Section 10.05 .  Evidence of Compliance of Supplemental Indenture to Be Furnished Trustee	56
	Article 11 

Consolidation, Merger, Sale, Conveyance and Lease
	Section 11.01 .  Company May Consolidate, Etc. on Certain Terms	56
	Section 11.02 .  Successor Corporation to Be Substituted	57
	Section 11.03 .  Opinion of Counsel to Be Given to Trustee	58
	Article 12 

Immunity of Incorporators, Stockholders, Officers and Directors
	Section 12.01 .  Indenture and Notes Solely Corporate Obligations	58
	Article 13 

Intentionally Omitted
	Article 14 

Conversion of Notes
	Section 14.01 .  Conversion Privilege	58
	Section 14.02 .  Conversion Procedure; Settlement Upon Conversion.	62






	Section 14.03 .  Increased Conversion Rate Applicable to Certain Notes Surrendered in Connection with Make-Whole Fundamental
Changes or During a Redemption Period	67
	Section 14.04 .  Adjustment of Conversion Rate	69
	Section 14.05 . Adjustments of Prices	79



 






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	Section 14.06 .  Shares to Be Fully Paid	79
	Section 14.07 .  Effect of Recapitalizations, Reclassifications and Changes of the Common Stock.	79
	Section 14.08 .  Certain Covenants	81
	Section 14.09 .  Responsibility of Trustee	81
	Section 14.10 .  Reserved.	82
	Section 14.11 . Stockholder Rights Plans	82
	Section 14.12 .  Exchange In Lieu Of Conversion	82
	Article 15 

Repurchase of Notes at Option of Holders
	Section 15.01 .  Intentionally Omitted.	83
	Section 15.02 .  Repurchase at Option of Holders Upon a Fundamental Change	83
	Section 15.03 .  Withdrawal of Fundamental Change Repurchase Notice	86
	Section 15.04 .  Deposit of Fundamental Change Repurchase Price	87
	Section 15.05 .  Covenant to Comply with Applicable Laws Upon Repurchase of Notes	87
	Article 16 

Optional Redemption
	Section 16.01 .  Optional Redemption	88
	Section 16.02 .  Notice of Optional Redemption; Selection of Notes	88
	Section 16.03 .  Payment of Notes Called for Redemption	90
	Section 16.04 .  Restrictions on Redemption	90
	Article 17 

Miscellaneous Provisions
	Section 17.01 .  Provisions Binding on Company’s Successors	90
	Section 17.02 .  Official Acts by Successor Corporation	90
	Section 17.03 .  Addresses for Notices, Etc	90
	Section 17.04 .  Governing Law; Jurisdiction	91
	Section 17.05 .  Evidence of Compliance with Conditions Precedent; Certificates and Opinions of Counsel to Trustee	92
	Section 17.06 .  Legal Holidays	92
	Section 17.07 .  No Security Interest Created	93
	Section 17.08 .  Benefits of Indenture	93
	Section 17.09 .  Table of Contents, Headings, Etc	93






	Section 17.10 .  Authenticating Agent	93
	Section 17.11 .  Execution in Counterparts	94
	Section 17.12 .  Severability	94
	Section 17.13 .  Waiver of Jury Trial	94
	Section 17.14 .  Force Majeure	94
	Section 17.15 .  Calculations	95
	Section 17.16 .  U.S.A. PATRIOT Act	95
	Section 17.17 .  Tax Withholding	95


 


EXHIBIT


Exhibit AForm of NoteA-1


 




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INDENTURE, dated as of May 18, 2020, between
PLUG POWER INC., a Delaware corporation, as issuer (the “Company”, as more fully set forth in ‎Section
1.01) and WILMINGTON TRUST, NATIONAL ASSOCIATION, a national banking association, as trustee (the “Trustee”,
as more fully set forth in ‎Section 1.01).


 


W I T N E S E T H:


 


WHEREAS, for its lawful corporate purposes,
the Company has duly authorized the issuance of its 3.75% Convertible Senior Notes due 2025 (the “Notes”), initially
in an aggregate principal amount not to exceed $200,000,000 (as increased by an amount equal to the aggregate principal amount
of any additional Notes purchased by the Initial Purchasers pursuant to the exercise of their option to purchase additional Notes
as set forth in the Purchase Agreement), 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 Repurchase Notice
and the Form of Assignment and Transfer to be borne by the Notes are to be substantially in the forms hereinafter provided; 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 this Indenture a valid, binding
and legal agreement of the Company and the Trustee, have been done and performed, and the execution of this Indenture and the issuance
hereunder of the Notes have in all respects been duly authorized.


 


NOW, THEREFORE, THIS INDENTURE WITNESSETH:


 


That in order to declare the terms and conditions
upon which the Notes are, and are to be, authenticated, issued and delivered, and in consideration of the premises and of the purchase
and acceptance of the Notes by the Holders thereof, the Company covenants and agrees with the Trustee for the equal and proportionate
benefit of the respective Holders from time to time of the Notes (except as otherwise provided below), as follows:


 


Article
1

Definitions


 


Section 1.01. Definitions. The
terms defined in this ‎Section 1.01 (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 this ‎Section 1.01. 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.


 






    


     


    




 


“Additional Interest”
means all amounts, if any, payable pursuant to ‎Section 4.06(d), ‎Section 4.06(e) and ‎Section 6.03, as applicable.


 


“Additional Shares” shall
have the meaning specified in ‎Section 14.03(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. Notwithstanding anything to the contrary herein, the determination of whether one Person
is an “Affiliate” of another Person for purposes of this Indenture shall be made based on the facts at the time such
determination is made or required to be made, as the case may be, hereunder.


 


“Bid Solicitation Agent”
means the Company or the Person appointed by the Company to solicit bids for the Trading Price of the Notes in accordance with
 ‎Section 14.01(b)(i). The Company shall initially act as the Bid Solicitation Agent.


 


“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.


 


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


 


“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; provided that debt securities that are convertible into or
exchangeable for Capital Stock shall not constitute Capital Stock prior to their conversion or exchange, as the case may be.


 


“Cash Settlement” shall
have the meaning specified in ‎Section 14.02(a).


 


“Certain Distributions Notification”
shall have the meaning specified in ‎Section 14.01(b)(ii).


 




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“Certain Distributions Conversion
Period End Date” shall have the meaning specified in ‎Section 14.01(b)(ii).


 


“Clause A Distribution”
shall have the meaning specified in ‎Section 14.04(c).


 


“Clause B Distribution”
shall have the meaning specified in ‎Section 14.04(c).


 


“Clause C Distribution”
shall have the meaning specified in ‎Section 14.04(c).


 


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


 


“Combination Settlement”
shall have the meaning specified in ‎Section 14.02(a).


 


“Commission” means the
U.S. Securities and Exchange Commission.


 


“Common Equity” of any
Person means Capital Stock of such Person that is generally entitled (a) to vote in the election of directors of such Person or
(b) if such Person is not a corporation, to vote or otherwise participate in the selection of the governing body, partners, managers
or others that will control the management or policies of such Person.


 


“Common Stock” means
the common stock of the Company, par value $0.01 per share, at the date of this Indenture, subject to ‎Section 14.07.


 


“Company” shall have
the meaning specified in the first paragraph of this Indenture, and subject to the provisions of ‎Article 11, shall include
its successors and assigns.


 


“Company Order” means
a written order of the Company, signed on behalf of the Company by an Officer.


 


“Conversion Agent” shall
have the meaning specified in ‎Section 4.02.


 


“Conversion Consideration”
shall have the meaning specified in ‎Section 14.12(a).


 


“Conversion Date” shall
have the meaning specified in ‎Section 14.02(c).


 


“Conversion Obligation”
shall have the meaning specified in ‎Section 14.01(a).


 


“Conversion Price” means
as of any time, $1,000, divided by the Conversion Rate as of such time.


 


“Conversion Rate” shall
have the meaning specified in ‎Section 14.01(a).


 


“Corporate Event” shall
have the meaning specified in ‎Section 14.01(b).


 




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“Corporate Trust Office”
means the designated office of the Trustee at which at any time this Indenture shall be administered, which office at the date
hereof is located at 50 South Sixth Street, Suite 1290, Minneapolis, MN 55402, Attention: Plug Power Inc. Account Manager or such
other address as the Trustee may designate from time to time by notice to the Holders and the Company, or the designated 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
Trustee, as custodian for The Depository Trust Company, with respect to the Global Notes, or any successor entity thereto.


 


“Daily Conversion Value”
means, for each of the 40 consecutive Trading Days during the relevant Observation Period, 2.5% of the product of (a) the Conversion
Rate on such Trading Day and (b) the Daily VWAP on such Trading Day.


 


“Daily Measurement Value”
means the Specified Dollar Amount (if any), divided by 40.


 


“Daily Settlement Amount,”
for each of the 40 consecutive Trading Days during the relevant Observation Period, shall consist of:


 


(a)       cash
in an amount equal to the lesser of (i) the Daily Measurement Value and (ii) the Daily Conversion Value on such Trading Day; and


 


(b)       if
the Daily Conversion Value on such Trading Day exceeds the Daily Measurement Value, a number of shares of Common Stock equal to
(i) the difference between the Daily Conversion Value and the Daily Measurement Value, divided by (ii) the Daily VWAP for
such Trading Day.


 


“Daily VWAP” means the
per share volume-weighted average price as displayed under the heading “Bloomberg VWAP” on Bloomberg page “PLUG
 <equity> AQR” (or its equivalent successor if such page is not available) 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 the Common Stock on such Trading Day determined, using a volume-weighted
average method, by a nationally recognized independent investment banking firm retained for this purpose by the Company). The “Daily
VWAP” shall be determined without regard to after-hours 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 Amounts” means
any amounts on any Note (including, without limitation, the Redemption Price, the Fundamental Change Repurchase Price, principal
and interest) that are payable but are not punctually paid or duly provided for.


 


“Default Settlement Method”
means Combination Settlement with a Specified Dollar Amount of $1,000 per $1,000 principal amount of Notes; provided, however,
that the Company may, from time to time, change the Default Settlement Method by sending written notice of the new Default Settlement
Method to the Holders, the Trustee and the Conversion Agent subject to Section 14.02.


 






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“delivered” with respect
to any notice to be delivered, given or mailed to a Holder pursuant to this Indenture, shall mean notice (x) given to the Depositary
(or its designee) pursuant to the standing instructions from the Depositary or its designee, including by electronic mail in accordance
with accepted practices or procedures at the Depositary (in the case of a Global Note) or (y) mailed to such Holder by first class
mail, postage prepaid, at its address as it appears on the Note Register, in each case in accordance with ‎Section 17.03.
Notice so “delivered” shall be deemed to include any notice to be “mailed” or “given,” as applicable,
under this Indenture.


 


“Depositary” means, with
respect to each Global Note, the Person specified in ‎Section 2.05(c) 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 or include such successor.


 


“Designated Institution”
shall have the meaning specified in ‎Section 14.12(a).


 


“Distributed Property”
shall have the meaning specified in ‎Section 14.04(c).


 


“Effective Date” shall
have the meaning specified in ‎Section 14.03(c), except that, as used in ‎Section 14.04 and ‎Section 14.05, “Effective
Date” means the first date on which shares of the Common Stock trade on the applicable exchange or in the applicable
market, regular way, reflecting the relevant share split or share combination, as applicable.


 


“Event of Default” shall
have the meaning specified in ‎Section 6.01.


 


“expiration date” shall
have the meaning specified in ‎Section 14.04(e).


 


“Ex-Dividend Date” means
the first date on which shares of the Common Stock trade on the applicable exchange or in the applicable market, regular way, without
the right to receive the issuance, dividend or distribution in question, from the Company or, if applicable, from the seller of
the Common Stock on such exchange or market (in the form of due bills or otherwise) as determined by such exchange or market.


 


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


 


“Exchange Election” shall
have the meaning specified in ‎Section 14.12(a).


 


“Form of Assignment and Transfer”
shall mean the “Form of Assignment and Transfer” attached as Attachment 3 to the Form of Note attached hereto as Exhibit
A.


 






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“Form of Fundamental Change Repurchase
Notice” shall mean the “Form of Fundamental Change Repurchase Notice” attached as Attachment 2 to the Form
of Note attached hereto as Exhibit A.


 


“Form of Note” shall
mean the “Form of Note” attached hereto as Exhibit A.


 


“Form of Notice of Conversion”
shall mean the “Form of Notice of Conversion” attached as Attachment 1 to the Form of Note attached hereto as Exhibit
A.


 


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


 


(a)       except
as described in clause (b) below, a “person” or “group” within the meaning of Section 13(d) of the Exchange
Act, other than the Company, its direct or indirect Wholly Owned Subsidiaries and the employee benefit plans of the Company and
its Wholly Owned Subsidiaries, files a Schedule TO or any schedule, form or report under the Exchange Act disclosing that such
person or group has become the direct or indirect “beneficial owner,” as defined in Rule 13d-3 under the Exchange Act,
of the Common Stock representing more than 50% of the voting power of the Common Stock;


 


(b)       the
consummation of (A) any recapitalization, reclassification or change of the Common Stock (other than changes resulting from a subdivision
or combination or solely a change in par value) as a result of which the Common Stock would be converted into, or exchanged for,
stock, other securities, other property or assets (other than a transaction described in clause (B)); (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 assets;
or (C) 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 other than one of the Company’s direct or indirect
Wholly Owned Subsidiaries (other than a lease of any of the Company’s or the Company’s Subsidiaries’ products
pursuant to “Power Purchase Agreements” as described in the Company’s Annual Report on Form 10-K for the year
ended December 31, 2019 and any similar agreements entered into after such date); provided, however, that a transaction
described in clause (B) in which the holders of all classes of the Company’s Common Equity immediately prior to such transaction
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 transaction in substantially the same proportions (relative to each other) as such
ownership immediately prior to such transaction shall not be a Fundamental Change pursuant to this clause (b);


 


(c)       the
stockholders of the Company approve any plan or proposal for the liquidation or dissolution of the Company; or


 






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(d)       the
Common Stock (or other Common Equity underlying the Notes) ceases to be listed or quoted on any of The New York Stock Exchange,
The Nasdaq Global Select Market, The Nasdaq Global Market or The Nasdaq Capital Market (or any of their respective successors);


 


provided, however, that a transaction or transactions
described in (b) above shall not constitute a Fundamental Change if at least 90% of the consideration received or to be received
by the common stockholders of the Company, excluding cash payments for fractional shares and cash payments made in respect of dissenters’
appraisal rights, in connection with such transaction or transactions consists of shares of common stock (or other Common Equity)
that are listed or quoted on any of The New York Stock Exchange, The Nasdaq Global Select Market or The Nasdaq Global Market, or
The Nasdaq Capital Market (or any of their respective successors) or will be so listed or quoted when issued or exchanged in connection
with such transaction or transactions and as a result of such transaction or transactions such consideration, excluding cash payments
for fractional shares and cash payments made in respect of dissenters’ appraisal rights, becomes Reference Property for the
Notes. If any transaction in which the Common Stock is replaced by the securities of another entity occurs, following completion
of any related Make-Whole Fundamental Change Period (or, in the case of a transaction that would have been a Fundamental Change
or a Make-Whole Fundamental Change but for the proviso in the immediately preceding paragraph, following the effective date
of such transaction) references to the Company in this definition shall instead be references to such other entity.


 


“Fundamental Change Company Notice”
shall have the meaning specified in ‎Section 15.02(c).


 


“Fundamental Change Repurchase
Date” shall have the meaning specified in ‎Section 15.02(a).


 


“Fundamental Change Repurchase
Notice” shall have the meaning specified in ‎Section 15.02(b)(i).


 


“Fundamental Change Repurchase
Price” shall have the meaning specified in ‎Section 15.02(a).


 


“Global Note” shall have
the meaning specified in ‎Section 2.05(b).


 


“Holder,” as applied
to any Note, or other similar terms (but excluding the term “beneficial holder”), shall mean any Person in whose name
at the time a particular Note is registered on the Note Register.


 


“Indenture” means this
instrument as originally executed or, if amended or supplemented as herein provided, as so amended or supplemented.


 


“Initial Purchasers”
means Morgan Stanley & Co. LLC, Cowen and Company, LLC, Oppenheimer & Co. Inc., SunTrust Robinson Humphrey, Inc., Canaccord
Genuity LLC, H.C. Wainwright & Co., LLC and Roth Capital Partners, LLC.


 






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“Interest Payment Date”
means each June 1 and December 1 of each year, beginning on December 1, 2020.


 


“Last Reported Sale Price”
of the Common Stock on any date means the closing sale price per share (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. national or regional 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. The “Last Reported Sale Price” shall be determined without regard to after-hours trading
or any other trading outside of regular trading session hours.


 


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


 


“Make-Whole Fundamental Change
Period” shall have the meaning specified in ‎Section 14.03(a).


 


“Market Disruption Event”
means, for the purposes of determining amounts due upon conversion (a) a failure by the primary U.S. national or regional securities
exchange or market on which the Common Stock is listed or admitted for trading to open for trading during its regular trading session
or (b) the occurrence or existence prior to 1:00 p.m., New York City time, on any Scheduled Trading Day for the Common Stock for
more than 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 futures contracts traded on any U.S. exchange relating to the Common Stock.


 


“Maturity Date” means
June 1, 2025.


 


“Measurement Period”
shall have the meaning specified in ‎Section 14.01(b)(i).


 


“Note” or “Notes”
shall have the meaning specified in the first paragraph of the recitals of this Indenture.


 


“Note Register” shall
have the meaning specified in ‎Section 2.05(a).


 


“Note Registrar” shall
have the meaning specified in ‎Section 2.05(a).


 






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“Notice of Conversion”
shall have the meaning specified in ‎Section 14.02(b).


 


“Observation Period”
with respect to any Note surrendered for conversion means: (i) subject to clause (ii), if the relevant Conversion Date occurs
prior to December 1, 2024, the 40 consecutive Trading Day period beginning on, and including, the second Trading Day immediately
succeeding such Conversion Date; (ii) if the relevant Conversion Date occurs during a Redemption Period pursuant to ‎‎Section
16.02, the 40 consecutive Trading Days beginning on, and including, the 41st Scheduled Trading Day immediately preceding the such
Redemption Date; and (iii) subject to clause (ii), if the relevant Conversion Date occurs on or after December 1, 2024, the 40
consecutive Trading Days beginning on, and including, the 41st Scheduled Trading Day immediately preceding the Maturity Date.


 


“Offering Memorandum”
means the preliminary offering memorandum dated May 13, 2020, as supplemented by the related pricing term sheet dated May 13, 2020,
relating to the offering and sale of the Notes.


 


“Officer” means, with
respect to the Company, the Chief Executive Officer, the Chief Financial Officer, the Chief Legal Officer, the Chief Accounting
Officer, the Treasurer, any assistant Treasurer, the Secretary, any assistant Secretary, or any President or Vice President (whether
or not designated by a number or numbers or word or words added before or after the title “President” or “Vice
President”).


 


“Officer’s Certificate,”
when used with respect to the Company, means a certificate that is delivered to the Trustee and that is signed by an Officer of
the Company. Each such certificate shall include the statements provided for in ‎Section 17.05 if and to the extent required
by the provisions of such Section. The Officer giving an Officer’s Certificate pursuant to ‎Section 4.08 shall be the
principal executive, financial or accounting officer of the Company.


 


“1% Provision” shall
have the meaning specified in ‎Section 14.04(j).


 


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


 


“Opinion of
Counsel” means an opinion in writing signed by legal counsel, who may be an employee of or counsel to the Company,
or other counsel who is reasonably acceptable to the Trustee, that is delivered to the Trustee, which opinion may contain
customary exceptions and qualifications as to the matters set forth therein. Each such opinion shall include the statements
provided for in ‎Section 17.05 if and to the extent required by the provisions of such ‎Section 17.05.


 


“Optional Redemption”
shall have the meaning specified in ‎‎Section 16.01.


 


“outstanding,” when used
with reference to Notes, shall, subject to the provisions of ‎Section 8.04, mean, as of any particular time, all Notes authenticated
and delivered by the Trustee under this Indenture, except:


 






    9


     


    

 


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


 


(b)       Notes,
or portions thereof, that have become due and payable and in respect of which monies in the necessary amount shall have been deposited
in trust with the Trustee or with any 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 2.06 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 2.06 unless proof satisfactory to the Trustee is
presented that any such Notes are held by protected purchasers in due course;


 


(d)       Notes
surrendered for purchase in accordance with Article 15 for which Paying Agent holds money sufficient to pay the Fundamental Change
Repurchase Price, in accordance with ‎Section 15.04(b);


 


(e)       Notes
converted pursuant to ‎Article 14 and required to be cancelled pursuant to ‎Section 2.08;


 


(f)       Notes
redeemed pursuant to ‎‎Article 16; and


 


(g)       Notes
repurchased by the Company pursuant to the penultimate sentence of ‎Section 2.10.


 


“Paying Agent” shall
have the meaning specified in ‎Section 4.02.


 


“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
permanent certificated Notes in registered form issued in minimum denominations of $1,000 principal amount and integral multiples
in excess thereof.


 


“Physical Settlement”
shall have the meaning specified in ‎Section 14.02(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 2.06 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.


 


“Purchase Agreement”
means that certain Purchase Agreement, dated as of May 13, 2020, among the Company and the Initial Purchasers.


 






    10


     


    

 


“Record Date” means,
with respect to any dividend, distribution or other transaction or event in which the holders of Common Stock (or other applicable
security) have the right to receive any cash, securities or other property or in which the Common Stock (or such other security)
is exchanged for or converted into any combination of cash, securities or other property, the date fixed for determination of holders
of the Common Stock (or such other security) entitled to receive such cash, securities or other property (whether such date is
fixed by the Board of Directors, by statute, by contract or otherwise).


 


“Redemption Date” shall
have the meaning specified in ‎Section 16.02(a).


 


“Redemption Notice” shall
have the meaning specified in ‎Section 16.02(a).


 


“Redemption Notice Date”
means the date on which a Redemption Notice is delivered pursuant to ‎Section 16.02.


 


“Redemption Period” means
the period from, and including, the relevant Redemption Notice Date until the close of business on the second Scheduled Trading
Day immediately preceding the related Redemption Date.


 


“Redemption Price” means,
for any Notes to be redeemed pursuant to ‎Section 16.01, 100% of the principal amount of such Notes, plus accrued
and unpaid interest, if any, to, but excluding, the Redemption Date (unless the Redemption Date falls after a Regular Record Date
but on or prior to the immediately succeeding Interest Payment Date, in which case interest accrued to the Interest Payment Date
will be paid to Holders of record of such Notes on such Regular Record Date, and the Redemption Price will be equal to 100% of
the principal amount of such Notes).


 


“Reference Property”
shall have the meaning specified in ‎Section 14.07(a).


 


“Regular Record Date,”
with respect to any Interest Payment Date, shall mean the May 15 or November 15 (whether or not such day is a Business Day) immediately
preceding the applicable June 1 or December 1 Interest Payment Date, respectively.


 


“Resale Restriction Termination
Date” shall have the meaning specified in ‎Section 2.05(c).


 


“Responsible Officer”
means, when used with respect to the Trustee, any officer within the Corporate Trust Office of the Trustee, including any vice
president, assistant vice president, assistant secretary, assistant treasurer, trust officer or any other officer of the Trustee
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 relating to this Indenture is referred because of such person’s knowledge of and familiarity
with the particular subject and who, in each case, shall have direct responsibility for the administration of this Indenture.


 


“Restrictive Legend”
shall have the meaning specified in ‎Section 2.05(c).


 






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“Restricted Securities”
shall have the meaning specified in ‎Section 2.05(c).


 


“Rule 144” means Rule
144 as promulgated under the Securities Act.


 


“Rule 144A” means Rule
144A as promulgated under the Securities Act.


 


“Scheduled Trading Day”
means a day that is scheduled to be a Trading Day on the principal U.S. national or regional 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 Amount” has
the meaning specified in ‎Section 14.02(a)(iv).


 


“Settlement Method” means,
with respect to any conversion of Notes, Physical Settlement, Cash Settlement or Combination Settlement, as elected (or deemed
to have been elected) by the Company.


 


“Settlement Notice” has
the meaning specified in ‎Section 14.02(a)(iii).


 


“Share Exchange Event”
shall have the meaning specified in ‎Section 14.07(a).


 


“Significant
Subsidiary” means a Subsidiary of the Company that meets the definition of “significant subsidiary” in
Article 1, Rule 1-02 of Regulation S-X promulgated by the Commission; provided that, in the case of a Subsidiary of
the Company that meets the criteria of clause (3) of the definition thereof but not clause (1) or (2) thereof, in each case
as such rule is in effect on the issue date of the Notes, such Subsidiary shall not be deemed to be a Significant Subsidiary
unless such Subsidiary’s income from continuing operations before income taxes, exclusive of amounts attributable to
any non-controlling interests, for the last completed fiscal year prior to the date of such determination exceeds
$15,000,000. For the avoidance of doubt, to the extent any such Subsidiary would not be deemed to be a Significant Subsidiary
under the relevant definition set forth in Article 1, Rule 1-02 of Regulation S-X (or any successor rule) as in effect on the
relevant date of determination, such Subsidiary shall not be deemed to be a “Significant Subsidiary” under this
Indenture irrespective of whether such Subsidiary would otherwise be deemed to be a “Significant Subsidiary”
pursuant to the immediately preceding sentence.


 


“Specified Dollar Amount”
means the maximum cash amount per $1,000 principal amount of Notes to be received upon conversion as specified in the Settlement
Notice related to any converted Notes (or deemed specified pursuant to ‎Section 14.02(a)).


 


“Spin-Off” shall have
the meaning specified in ‎Section 14.04(c).


 


“Stock Price” shall have
the meaning specified in ‎Section 14.03(c).


 






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“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.


 


“Successor Company” shall
have the meaning specified in ‎Section 11.01(a).


 


“Trading Day”,
except for determining amounts due upon conversion, means a day on which (i) trading in the Common Stock (or other security
for which a closing sale price must be determined) generally occurs on The Nasdaq Capital Market or, if the Common Stock (or
such other security) is not then listed on The Nasdaq Capital Market, on the principal other U.S. national or regional
securities exchange on which the Common Stock (or such other security) is then listed or, if the Common Stock (or such other
security) is not then listed on a U.S. national or regional securities exchange, on the principal other market on which the
Common Stock (or such other security) is then traded and (ii) a Last Reported Sale Price for the Common Stock (or closing
sale price for such other security) is available on such securities exchange or market; provided that if the Common
Stock (or such other security) is not so listed or traded, “Trading Day” means a Business Day; and provided, further,
that for purposes of determining amounts due upon conversion only, “Trading Day” means a day on which (x)
there is no Market Disruption Event and (y) trading in the Common Stock generally occurs on The Nasdaq Capital Market or, if
the Common Stock is not then listed on The Nasdaq Capital Market, on the principal other U.S. national or regional securities
exchange on which the Common Stock is then listed or, if the Common Stock is not then listed on a U.S. national or regional
securities exchange, on the principal other market on which the Common Stock is then listed or admitted for trading, except
that if the Common Stock is not so listed or admitted for trading, “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 per $1,000 principal amount of the
Notes obtained by the Bid Solicitation Agent for $2,000,000 principal amount of Notes at approximately 3:30 p.m., New York City
time, on such determination date from three independent nationally recognized securities dealers the Company selects for this purpose;
provided that if three such bids cannot reasonably be obtained by the Bid Solicitation Agent but 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 Notes from a nationally recognized securities dealer on any determination date, then the Trading Price per $1,000 principal
amount of Notes on such determination date shall be deemed to be less than 98% of the product of the Last Reported Sale Price of
the Common Stock and the Conversion Rate.


 


“Trading Price Condition”
shall have the meaning specified in ‎Section 14.01(b).


 






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“transfer” shall have
the meaning specified in ‎Section 2.05(c).


 


“Trigger Event” shall
have the meaning specified in ‎Section 14.04(c).


 


“Trust Indenture Act”
means the Trust Indenture Act of 1939, as amended, as it was in force at the date of execution of this Indenture; provided,
however, that in the event the Trust Indenture Act of 1939 is amended after the date hereof, the term “Trust Indenture
Act” shall mean, to the extent required by such amendment, the Trust Indenture Act of 1939, as so amended.


 


“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.


 


“unit of Reference Property”
shall have the meaning specified in ‎Section 14.07(a).


 


“Valuation Period” shall
have the meaning specified in ‎Section 14.04(c).


 


“Wholly Owned Subsidiary”
means, with respect to any Person, any Subsidiary of such Person, except that, solely for purposes of this definition, the reference
to “more than 50%” in the definition of “Subsidiary” shall be deemed replaced by a reference to “100%”.


 


Section 1.02. References to
Interest. Unless the context otherwise requires, any reference to interest on, or in respect of, any Note in this
Indenture shall be deemed to include Additional Interest if, in such context, Additional Interest is, was or would be payable
pursuant to any of ‎Section 4.06(d), ‎Section 4.06(e) and ‎Section 6.03. Unless the context otherwise
requires, any express mention of Additional Interest in any provision hereof shall not be construed as excluding Additional
Interest in those provisions hereof where such express mention is not made.


 


Article
2

Issue, Description, Execution, Registration and Exchange of Notes


 


Section 2.01. Designation and Amount.
The Notes shall be designated as the “3.75% Convertible Senior Notes due 2025.” The aggregate principal amount of Notes
that may be authenticated and delivered under this Indenture is initially limited to $200,000,000 (as increased by an amount equal
to the aggregate principal amount of any additional Notes purchased by the Initial Purchasers pursuant to the exercise of their
option to purchase additional Notes as set forth in the Purchase Agreement), subject to ‎Section 2.10 and except for Notes
authenticated and delivered upon registration or transfer of, or in exchange for, or in lieu of other Notes to the extent permitted
hereunder.


 


Section 2.02. Form of Notes. The
Notes and the Trustee’s certificate of authentication to be borne by such Notes shall be substantially in the respective
forms set forth in Exhibit A, the terms and provisions of which shall constitute, and are hereby expressly incorporated in and
made a part of this Indenture. To the extent applicable, the Company and the Trustee, by their execution and delivery of this Indenture,
expressly agree to such terms and provisions and to be bound thereby. In the case of any conflict between this Indenture and a
Note, the provisions of this Indenture shall control and govern to the extent of such conflict.


 







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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 Officer 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.


 


Each 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 redemptions, repurchases, cancellations, conversions, transfers
or exchanges permitted hereby. Any endorsement of a Global Note to reflect the amount of any increase or decrease in the amount
of outstanding Notes represented thereby shall be made by the Trustee or the Custodian, at the direction of the Trustee, in such
manner and upon instructions given by the Holder of such Notes in accordance with this Indenture. Payment of principal (including
the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, and accrued and unpaid interest on, a 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.


 


Section 2.03. Date and Denomination
of Notes; Payments of Interest and Defaulted Amounts. (a) The Notes shall be issuable in registered form without coupons
in minimum denominations of $1,000 principal amount and integral multiples in excess thereof. Each Note shall be dated the
date of its authentication and shall bear interest from the date specified on the face of such Note. Accrued interest on the
Notes shall be computed on the basis of a 360-day year composed of twelve 30-day months and, for partial months, on the basis
of the number of days actually elapsed in a 30-day month.


 






    15


     


    

 


(b)           
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. The principal amount of any Note (x) in the case of any Physical Note, shall be payable at the office or
agency of the Company designated by the Company for such purposes in the continental United States of America, which shall initially
be the Corporate Trust Office and (y) in the case of any Global Note, shall be payable by wire transfer of immediately available
funds to the account of the Depositary or its nominee. The Company shall pay or cause the Paying Agent to pay interest (i)
on any Physical Notes (A) to Holders holding Physical Notes having an aggregate
principal amount of $5,000,000 or less, by check mailed to the Holders of these Notes at their address as it appears in the Note
Register and (B) to Holders holding Physical Notes having an aggregate principal
amount of more than $5,000,000, either by check mailed to each such Holder or, upon application by such a Holder to the Note Registrar
(containing the requisite information for the Trustee or Paying Agent to make such wire transfer) not later than the relevant Regular
Record Date, by wire transfer in immediately available funds to that Holder’s account within the United States of America,
which application shall remain in effect until the Holder notifies, in writing, the Note Registrar to the contrary or (ii)
on any Global Note by wire transfer of immediately available funds to the account of the Depositary or its nominee.


 


(c)            Any
Defaulted Amounts shall forthwith cease to be payable to the Holder on the relevant payment date but shall accrue interest
per annum at the rate borne by the Notes from, and including, such relevant payment date, and such Defaulted Amounts together
with such interest thereon shall be paid by the Company, at its election in each case, as provided in clause ‎(i) or
 ‎(ii) below:


 


(i)           
The Company may elect to make payment of any Defaulted Amounts 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 Amounts,
which shall be fixed in the following manner. The Company shall notify the Trustee in writing of the amount of the Defaulted Amounts
proposed to be paid on each Note and the date of the proposed payment (which shall be not less than 25 days after the receipt by
the Trustee of such notice, unless the Trustee shall consent to an earlier date), and at the same time the Company shall deposit
with the Trustee an amount of money equal to the aggregate amount to be paid in respect of such Defaulted Amounts or shall make
arrangements satisfactory to the Trustee 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 Amounts as in this clause provided. Thereupon the
Company shall fix a special record date for the payment of such Defaulted Amounts which shall be not more than 15 days and not
less than 10 days prior to the date of the proposed payment, and not less than 10 days after the receipt by the Trustee of the
notice of the proposed payment. The Company shall promptly notify the Trustee in writing of such special record date at least 5
Business Days before notice is to be sent to Holders and the Trustee, in the name and at the expense of the Company, shall cause
notice of the proposed payment of such Defaulted Amounts and the special record date therefor to be delivered to each Holder at
its address as it appears in the Note Register, or by electronic means to the Depositary in the case of Global Notes, not less
than 10 days prior to such special record date. Notice of the proposed payment of such Defaulted Amounts and the special record
date therefor having been so delivered, such Defaulted Amounts 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 (ii) of this ‎Section 2.03‎(c). The Trustee shall have no responsibility whatsoever
for the calculation of the Defaulted Amounts.


 






    16


     


    

 


(ii)           
The Company may make payment of any Defaulted Amounts 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 written notice given by the Company to
the Trustee of the proposed payment pursuant to this clause, such manner of payment shall be deemed practicable by the Trustee.


 


Section 2.04. Execution,
Authentication and Delivery of Notes. The Notes shall be signed in the name and on behalf of the Company by the manual
digital, electronic or facsimile signature of any of its Chief Executive Officer, President, Chief Financial Officer,
Treasurer, Secretary or any of its Executive or Senior 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 Trustee for authentication,
together with a Company Order for the authentication and delivery of such Notes, and the Trustee in accordance with such Company
Order shall authenticate and deliver such Notes, without any further action by the Company hereunder; provided that the
Trustee shall be entitled to receive an Officer’s Certificate and an Opinion of Counsel of the Company with respect to the
issuance, authentication and delivery of 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 Trustee (or an authenticating agent appointed by the Trustee as provided by ‎Section 17.10),
shall be entitled to the benefits of this Indenture or be valid or obligatory for any purpose. Such certificate by the Trustee
(or such an 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 Trustee, 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 Officers of the Company, although at
the date of the execution of this Indenture any such Person was not such an Officer.


 






    17


     


    

 


Section 2.05. Exchange and Registration
of Transfer of Notes; Restrictions on Transfer; Depositary. (a) The Company
shall cause to be kept at the Corporate Trust Office a register (the register maintained in such office or in any other office
or agency of the Company designated pursuant to ‎Section 4.02, 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. The Trustee is hereby initially appointed the “Note Registrar” for the purpose of registering Notes
and transfers of Notes as herein provided. The Company may appoint one or more co-Note Registrars in accordance with ‎Section
4.02.


 


Upon surrender for registration of
transfer of any Note to the Note Registrar or any co-Note Registrar, and satisfaction of the requirements for such transfer
set forth in this ‎Section 2.05, the Company shall execute, and the Trustee 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 4.02. Whenever any Notes are so surrendered for exchange,
the Company shall execute, and the Trustee 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 Trustee, the Note Registrar or
any co-Note Registrar) be duly endorsed, or be accompanied by a written instrument or instruments of transfer in form satisfactory
to the Note Registrar and duly executed, by the Holder thereof or its attorney-in-fact duly authorized in writing.


 


No service charge shall be imposed by the
Company, the Trustee, the Note Registrar, any co-Note Registrar or the Paying Agent for any exchange or registration of transfer
of Notes, but the Company may require a Holder to pay a sum sufficient to cover any documentary, stamp or similar issue or transfer
tax or other similar governmental charge required in connection therewith as a result of the name of the Holder of new Notes issued
upon such exchange or registration of transfer being different from the name of the Holder of the old Notes surrendered for exchange
or registration of transfer or otherwise required by law.


 


None of the Company, the Trustee, the Note
Registrar or any co-Note 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, (ii) any Notes, or
a portion of any Note, surrendered for repurchase (and not withdrawn) in accordance with ‎Article 15 or (iii) any Notes selected
for redemption in accordance with ‎Article 16, except the unredeemed portion of any Note being redeemed in part or (iv) any
Notes between a Regular Record Date and corresponding Interest Payment Date.


 






    18


     


    

 


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, subject to
the fourth paragraph from the end of ‎Section 2.05(c) 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 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 Trustee or the Custodian) in accordance with this Indenture (including
the restrictions on transfer set forth herein) and the procedures of the Depositary therefor.


 


(c)           
Every Note that bears or is required under this ‎Section 2.05(c) to bear the legend set forth in this ‎Section
2.05(c) (together with any Common Stock issued upon conversion of the Notes that is required to bear the legend set forth in ‎Section
2.05(d), collectively, the “Restricted Securities”) shall be subject to the restrictions on transfer set forth
in this ‎Section 2.05(c) (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, and 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
2.05(c) and ‎Section 2.05(d), the term “transfer” encompasses any sale, pledge, transfer or other disposition
whatsoever of any Restricted Security.


 


Until the date (the “Resale Restriction
Termination Date”) that is the later of (1) the date that is one year after the last date of original issuance of the
Notes, or such shorter period of time as permitted by Rule 144 or any successor provision thereto, and (2) such later date, if
any, as may be required by applicable law, 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 2.05(d), if applicable) shall bear a legend in substantially the following form (the “Restrictive Legend”)
(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):


 


THIS SECURITY AND THE COMMON STOCK, IF ANY,
ISSUABLE UPON CONVERSION OF THIS SECURITY 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 EXCEPT IN ACCORDANCE WITH THE FOLLOWING SENTENCE.
BY ITS ACQUISITION HEREOF OR OF A BENEFICIAL INTEREST HEREIN, THE ACQUIRER:


 






    19


     


    

 


(1)       REPRESENTS
THAT IT AND ANY ACCOUNT FOR WHICH IT IS ACTING IS A “QUALIFIED INSTITUTIONAL BUYER” (WITHIN THE MEANING OF RULE 144A
UNDER THE SECURITIES ACT) AND THAT IT EXERCISES SOLE INVESTMENT DISCRETION WITH RESPECT TO EACH SUCH ACCOUNT, AND


 


(2)       AGREES
FOR THE BENEFIT OF PLUG POWER INC. (THE “COMPANY”) THAT IT WILL NOT OFFER, SELL, PLEDGE OR OTHERWISE
TRANSFER THIS SECURITY OR ANY BENEFICIAL INTEREST HEREIN PRIOR TO THE DATE THAT IS THE LATER OF (X) ONE YEAR AFTER THE LAST
ORIGINAL ISSUE DATE HEREOF OR SUCH SHORTER PERIOD OF TIME AS PERMITTED BY RULE 144 UNDER THE SECURITIES ACT OR ANY SUCCESSOR
PROVISION THERETO AND (Y) SUCH LATER DATE, IF ANY, AS MAY BE REQUIRED BY APPLICABLE LAW, 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 (2)(D) ABOVE, THE COMPANY AND THE TRUSTEE RESERVE THE RIGHT TO REQUIRE THE DELIVERY OF SUCH LEGAL OPINIONS,
CERTIFICATIONS OR OTHER EVIDENCE AS MAY REASONABLY BE REQUIRED IN ORDER FOR THE COMPANY 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.


 


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.


 






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Any Note (or security issued in
exchange or substitution therefor) (i) as to which such restrictions on transfer shall have expired in accordance with their
terms, (ii) that has been transferred pursuant to a registration statement that has become effective or been declared
effective under the Securities Act and that continues to be effective at the time of such transfer or (iii) that has been
sold pursuant to the exemption from registration provided by Rule 144 or any similar provision then in force under the
Securities Act, may, upon surrender of such Note for exchange to the Note Registrar in accordance with the provisions of this
 ‎‎Section 2.05, 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 2.05(c) and shall not be assigned (or deemed assigned)
a restricted CUSIP number. The Restrictive Legend set forth above and affixed on any Note will be deemed, in accordance with
the terms of the certificate representing such Note, to be removed therefrom upon the Company’s delivery to the Trustee
of written notice to such effect, without further action by the Company, the Trustee, the Holder(s) thereof or any other
Person; at such time, such Note will be deemed to be assigned an unrestricted CUSIP number as provided in the certificate
representing such Note, it being understood that the Depositary of any Global Note may require a mandatory exchange or other
process to cause such Global Note to be identified by an unrestricted CUSIP number in the facilities of such Depositary.
Without limiting the generality of any other provision of this Indenture, the Trustee will be entitled to receive an
instruction letter from the Company before taking any action with respect to effecting any such mandatory exchange or other
process. The Company and the Trustee 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 any proposed transfer of any Note is being made in
compliance with the Securities Act and applicable state securities laws.


 


The Company shall be entitled to instruct
the Custodian in writing to so surrender any Global Note as to which any of the conditions set forth in clause (i) through (iii)
of the immediately preceding sentence have been satisfied, and, upon such instruction, the Custodian shall so surrender such Global
Note for exchange; and any new Global Note so exchanged therefor shall not bear the Restrictive Legend specified in this ‎Section
2.05(c) and shall not be assigned (or deemed assigned) a restricted CUSIP number. The Company shall promptly notify the Trustee
in writing upon the occurrence of the Resale Restriction Termination Date and promptly after a 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.


 


Notwithstanding any other provisions of
this Indenture (other than the provisions set forth in this ‎Section 2.05(c)), 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 exchange of a Global Note or a portion thereof for one or more Physical Notes in accordance with the second
immediately succeeding paragraph.


 


The Depositary shall be a clearing agency
registered under the Exchange Act. The Company initially appoints The Depository Trust Company 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 Trustee as custodian for Cede & Co.


 






    21


     


    

 


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, subject to the Depositary’s applicable procedures, a beneficial owner of any
Note requests that its beneficial interest therein be issued as a Physical Note, the Company shall execute, and the Trustee,
upon receipt of an Officer’s 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 Trustee such Global Notes shall be canceled.


 


Physical Notes issued in exchange for all
or a part of the Global Note pursuant to this ‎Section 2.05(c) shall be registered in such names and in such authorized denominations
as the Depositary, pursuant to instructions from its direct or indirect participants or otherwise, or, in the case of clause (iii)
of the immediately preceding paragraph, the relevant beneficial owner, shall instruct the Trustee. Upon execution and authentication,
the Trustee 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, redeemed, repurchased or transferred, such Global Note shall be, upon receipt thereof, canceled
by the Trustee 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, redeemed,
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 the standing procedures and instructions
existing between the Depositary and the Custodian, be appropriately reduced or increased, as the case may be, and an endorsement
shall be made on such Global Note, by the Trustee or the Custodian, at the direction of the Trustee, to reflect such reduction
or increase.


 


None of the Company, the Trustee, the Paying
Agent, the Conversion Agent or any other agent of the Company or the Trustee shall have any responsibility or liability for the
payment of amounts to owners of beneficial interest in a Global Note, for any aspect of the records relating to or payments made
on account of those interests by the Depositary, or for maintaining, supervising or reviewing any records of the Depositary relating
to such beneficial ownership those interests.


 


Neither the Company nor the Trustee shall
have any responsibility or liability for any act or omission of the Depositary. All notices and communications to be given to the
Holders and all payments to be made to Holders in respect of the Notes shall be given or made only to, or upon the order of, the
registered Holder(s) (which shall be the Depositary or its nominee in the case of a Global Note).


 



    22


     


    




 


The rights of beneficial owners in any
Global Note shall be exercised only through the Depositary subject to the Applicable Procedures of the Depositary. The
Trustee may rely and shall be fully protected in relying upon information furnished by the Depositary with respect to its
members, participants and any beneficial owners.


 


(d)           
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 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 a Note that has 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 Trustee and any
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 EXCEPT IN ACCORDANCE WITH THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF OR OF A BENEFICIAL INTEREST HEREIN, THE
ACQUIRER:


 


(1)       REPRESENTS
THAT IT AND ANY ACCOUNT FOR WHICH IT IS ACTING IS A “QUALIFIED INSTITUTIONAL BUYER” (WITHIN THE MEANING OF RULE 144A
UNDER THE SECURITIES ACT) AND THAT IT EXERCISES SOLE INVESTMENT DISCRETION WITH RESPECT TO EACH SUCH ACCOUNT, AND


 


(2)       AGREES
FOR THE BENEFIT OF PLUG POWER INC. (THE “COMPANY”) THAT IT WILL NOT OFFER, SELL, PLEDGE OR OTHERWISE TRANSFER
THIS SECURITY OR ANY BENEFICIAL INTEREST HEREIN PRIOR TO THE DATE THAT IS THE LATER OF (X) ONE YEAR AFTER THE LAST ORIGINAL ISSUE
DATE OF THE SERIES OF NOTES UPON THE CONVERSION OF WHICH THIS SECURITY WAS ISSUED OR SUCH SHORTER PERIOD OF TIME AS PERMITTED BY
RULE 144 UNDER THE SECURITIES ACT OR ANY SUCCESSOR PROVISION THERETO AND (Y) SUCH LATER DATE, IF ANY, AS MAY BE REQUIRED BY APPLICABLE
LAW, EXCEPT:


 






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(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 (2)(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 FOR THE
COMPANY 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.


 


Any such Common Stock (i) as to which such
restrictions on transfer shall have expired in accordance with their terms, (ii) that has 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 (iii) that has been sold pursuant to the exemption from registration provided by Rule 144 or any similar provision
then in force under the Securities Act, may, upon surrender of the certificates representing such shares of 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
2.05(d).


 


(e)           
Any Note that is owned by any Affiliate of the Company (or any Person who was an Affiliate of the Company at any time during
the three months immediately preceding) may not be resold by such Affiliate (or such Person, as the case may be) unless registered
under the Securities Act or resold pursuant to an exemption from the registration requirements of the Securities Act in a transaction
that results in such Note or Common Stock, as the case may be, no longer being a “restricted security” (as defined
under Rule 144).


 


(f)           
The Trustee shall have no obligation or duty to monitor, determine or inquire as to compliance with any securities laws
or restrictions on transfer imposed under this Indenture or under applicable law with respect to any transfer of any interest in
any Note (including any transfers between or among Depositary participants or beneficial owners of interests in any Global Note)
other than to require delivery of such certificates and other documentation or evidence as are expressly required by, and to do
so if and when expressly required by the terms of, this Indenture, and to examine the same to determine substantial compliance
as to form with the express requirements hereof.


 






    24


     


    

 


(g)            Neither
the Trustee nor any agent shall have any responsibility or liability for any actions taken or not taken by the Depositary.
The Trustee may rely and shall be fully protected in relying upon information furnished by the Depositary with respect to its
members, participants and beneficial owners.


 


None of the Company, the Trustee, the Paying
Agent, the Conversion Agent or any other agent of the Company 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.


 


Neither the Company nor the Trustee shall
have any responsibility or liability for any act or omission of the Depositary. All notices and communications to be given to the
Holders and all payments to be made to Holders in respect of the Notes shall be given or made only to, or upon the order of, the
registered Holder(s) (which shall be the Depositary or its nominee in the case of a Global Note).


 


Section 2.06. 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 receipt of a Company Order the Trustee or an authenticating agent appointed by the Trustee shall authenticate
and deliver, a new Note, bearing a registration 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, to the Trustee and, if applicable, to such authenticating 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
Trustee 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 Trustee or such authenticating
agent may authenticate any such substituted Note and deliver the same upon the receipt of a Company Order and of such
security or indemnity as the Trustee, the Company and, if applicable, such authenticating agent may require. No service
charge shall be imposed by the Company, the Trustee, the Note Registrar, any co-Note Registrar or the Paying Agent upon the
issuance of any substitute Note, but the Company may require a Holder to pay a sum sufficient to cover any documentary, stamp
or similar issue or transfer tax or other similar governmental charge required in connection therewith as a result of the
name of the Holder of the new substitute Note being different from the name of the Holder of the old Note that became
mutilated or was destroyed, lost or stolen. In case any Note that has matured or is about to mature or has been surrendered
for required repurchase or is about to be converted in accordance with ‎Article 14 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 applicant for such payment or conversion shall furnish to the Company, to the
Trustee 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, and, in every case
of destruction, loss or theft, evidence satisfactory to the Company, the Trustee and, if applicable, any Paying Agent or
Conversion Agent of the destruction, loss or theft of such Note and of the ownership thereof.


 






    25


     


    

 


Every substitute Note issued pursuant to
the provisions of this ‎Section 2.06 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, payment, conversion,
redemption 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, payment, conversion,
redemption or repurchase of negotiable instruments or other securities without their surrender.


 


Section 2.07. Temporary Notes. Pending
the preparation of Physical Notes, the Company may execute and the Trustee or an authenticating agent appointed by the Trustee
shall, upon receipt of a Company Order, authenticate and deliver temporary Notes (printed or lithographed). Temporary Notes shall
be issuable in any authorized denomination, and substantially in the form of the Physical Notes 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 Trustee or such authenticating agent upon the same conditions and in substantially
the same manner, and with the same effect, as the Physical Notes. Without unreasonable delay, the Company shall execute and deliver
to the Trustee or such authenticating agent Physical Notes (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 4.02 and the Trustee or such authenticating agent shall, upon receipt of a Company Order, authenticate and deliver
in exchange for such temporary Notes an equal aggregate principal amount of Physical Notes. 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 Physical Notes authenticated and delivered hereunder.


 


Section 2.08. Cancellation of Notes
Paid, Converted, Etc. The Company shall cause all Notes surrendered for payment at maturity, redemption, repurchase upon
a Fundamental Change, registration of transfer or exchange or conversion, if surrendered to any Person that the Company
controls, to be delivered to the Trustee for cancellation. All Notes delivered to the Trustee shall be canceled promptly by
it, and no Notes shall be authenticated in exchange therefor except for Notes surrendered for registration of transfer or
exchange. The Trustee shall dispose of canceled Notes in accordance with its customary procedures and, after such
cancellation, shall deliver a certificate of such cancellation to the Company upon the Company’s written request in a
Company Order.


 







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Section 2.09. CUSIP Numbers. The
Company in issuing the Notes may use “CUSIP” numbers (if then generally in use), and, if so, the Trustee shall use
 “CUSIP” numbers in all notices issued to Holders as a convenience to such Holders; 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 shall promptly notify
the Trustee in writing of any change in the “CUSIP” numbers.


 


Section 2.10. Additional Notes; Repurchases.
The Company may, without the consent of, or notice to, the Holders and notwithstanding ‎Section 2.01, issue additional Notes
hereunder with the same terms as the Notes initially issued hereunder (other than differences in the issue date, the issue price,
interest accrued prior to the issue date of such additional Notes in an unlimited aggregate principal amount); provided
that if any such additional Notes are not fungible with the Notes initially issued hereunder for U.S. federal securities law and
income tax purposes, such additional Notes shall have one or more separate CUSIP numbers. The Notes offered by the Offering Memorandum
and any additional Notes would rank equally and ratably and would be treated as a single series for all purposes under this Indenture.
Prior to the issuance of any such additional Notes, the Company shall deliver to the Trustee a Company Order, an Officer’s
Certificate and an Opinion of Counsel, such Officer’s Certificate and Opinion of Counsel to cover such matters required by
 ‎Section 17.05. In addition, the Company may, to the extent permitted by law, and directly or indirectly (regardless of whether
such Notes are surrendered to the Company), repurchase Notes in the open market or otherwise, whether by the Company or its Subsidiaries
or through a private or public tender or exchange offer or through counterparties to private agreements, including by cash-settled
swaps or other derivatives, in each case, without prior written notice to or consent of the Holders. The Company may, at its option
and to the extent permitted by applicable law, reissue, resell or surrender to the Trustee for cancellation in accordance with
Section 2.08 any Notes that the Company may repurchase, in the case of a reissuance or resale, so long as such Notes do not constitute
 “restricted securities” (as defined under Rule 144) upon such reissuance or resale. Any Notes that the Company may
repurchase shall be considered outstanding for all purposes under this Indenture (other than, at any time when such Notes are held
by the Company, any of the Company’s Subsidiaries or Affiliates or any Subsidiary of any of the Company’s Affiliates,
for the purpose of determining whether Holders of the requisite aggregate principal amount of Notes have concurred in any direction,
consent, waiver or other action under this Indenture) unless and until such time as the Company surrenders them to the Trustee
for cancellation in accordance with Section 2.08 and, upon receipt of a written order from the Company, the Trustee shall cancel
all Notes so surrendered and such Notes shall no longer be considered outstanding under this Indenture.


 






    27


     


    

 


Article
3

Satisfaction and Discharge


 


Section 3.01. Satisfaction and Discharge.
This Indenture and the Notes shall upon request of the Company contained in an Officer’s Certificate cease to be of
further effect, and the Trustee, at the expense of the Company, shall execute such instruments reasonably requested by the Company
acknowledging satisfaction and discharge of this Indenture, when (a) (i) all Notes theretofore authenticated and delivered (other
than (x) Notes which have been destroyed, lost or stolen and which have been replaced, paid or converted as provided in ‎Section
2.06 and (y) Notes for whose payment money has theretofore been deposited in trust or segregated and held in trust by the Company
and thereafter repaid to the Company or discharged from such trust, as provided in ‎Section 4.04(d)) have been delivered
to the Trustee for cancellation; or (ii) the Company has deposited with the Trustee or delivered to Holders, as applicable, after
the Notes have (x) become due and payable, whether on the Maturity Date, Redemption Date or Fundamental Change Repurchase Date,
and/or (y) been converted (and the related consideration due upon conversion has been determined), cash or cash, shares of Common
Stock or a combination thereof, as applicable, solely to satisfy the Conversion Obligation, sufficient, without consideration
of reinvestment, to pay all of the outstanding Notes and all other sums due and payable under this Indenture by the Company; and
(b) the Company has delivered to the Trustee an Officer’s Certificate
and an Opinion of Counsel, each stating that all conditions precedent herein provided for relating to the satisfaction and discharge
of this Indenture have been complied with. Notwithstanding the satisfaction and discharge of this Indenture, the obligations of
the Company to the Trustee under ‎Section 7.06 shall survive.


 


Article
4

Particular Covenants of the Company


 


Section 4.01. Payment of Principal and
Interest. The Company covenants and agrees that it will cause to be paid the principal (including the Redemption Price, the
Fundamental Change Repurchase Price, if applicable) of, 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 4.02. Maintenance of Office or
Agency. The Company will maintain in the contiguous United States of America an office or agency where the Notes may be presented
for registration of transfer or exchange or for payment or repurchase (“Paying Agent”) or for conversion (“Conversion
Agent”) and where notices in respect of the Notes and this Indenture may be served. The Company will give prompt written
notice to the Trustee 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 with the address thereof, such presentations,
surrenders and notices may be made at the Corporate Trust Office in the United States of America as a place where Notes may be
presented for payment or for registration of transfer.


 




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The Company may also from time to time designate
as co-Note 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 in the contiguous United States of America so designated
by the Trustee as a place for such purposes. The Company will give prompt written notice to the Trustee 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.


 


The Company hereby initially designates
the Trustee as the Paying Agent, Note Registrar, Custodian and Conversion Agent and the Corporate Trust Office as the office or
agency in the contiguous United States of America where Notes may be presented for registration of transfer or exchange or for
payment or repurchase (if applicable) or for conversion and where notices in respect of the Notes and this Indenture may be presented;
provided that the Trustee shall not be considered an agent of the Company for service of legal process.


 


Section 4.03. Appointments to Fill Vacancies
in Trustee’s Office. The Company, whenever necessary to avoid or fill a vacancy in the office of Trustee, will appoint,
in the manner provided in ‎Section 7.09, a Trustee, so that there shall at all times be a Trustee hereunder.


 


Section 4.04. Provisions as to
Paying Agent. (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 4.04:


 


(i)           
that it will hold all sums held by it as such agent for the payment of the principal (including the Redemption Price, the
Fundamental Change Repurchase Price, if applicable) of, 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 written notice of any failure by the Company to make any payment of the principal (including
the Redemption Price, the Fundamental Change Repurchase Price, if applicable) of, 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, on or before each
due date of the principal (including the Redemption Price, the Fundamental Change Repurchase Price, if applicable) of, or
accrued and unpaid interest on, the Notes, deposit with the Paying Agent a sum in immediately available U.S. Dollars
sufficient to pay such principal (including the Redemption Price, the Fundamental Change Repurchase Price, if applicable) or
accrued and unpaid interest and (unless such Paying Agent is the Trustee) the Company will promptly notify the Trustee in
writing of any failure to take such action; provided that if such deposit is made on the due date, such deposit must
be received by the Paying Agent by 11:00 a.m., New York City time, on such date.


 






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(b)           
If the Company shall act as its own Paying Agent, it will, on or before each due date of the principal (including the Redemption
Price, the Fundamental Change Repurchase Price, if applicable) of, and 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 (including the Redemption
Price, the Fundamental Change Repurchase Price, if applicable) and 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
(including the Redemption Price, the Fundamental Change Repurchase Price, if applicable) of, or accrued and unpaid interest on,
the Notes when the same shall become due and payable.


 


(c)           
Anything in this ‎Section 4.04 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, cause to be paid or deliver to the Trustee all sums
or amounts held in trust by the Company or any Paying Agent hereunder as required by this ‎Section 4.04, such sums or amounts
to be held by the Trustee upon the trusts herein contained and upon such payment or delivery by the Company or any Paying Agent
to the Trustee, the Company or such Paying Agent shall be released from all further liability but only with respect to such sums
or amounts. Upon the occurrence of any event specified in ‎Section 6.01(i) or ‎Section 6.01(j), the Trustee shall automatically
become the Paying Agent.


 


(d)           
Subject to applicable escheatment laws, any money deposited with the Trustee, the Conversion Agent or any Paying Agent,
or any money and shares of Common Stock then held by the Company, in trust for the payment of the principal (including the Redemption
Price, the Fundamental Change Repurchase Price, if applicable) of, accrued and unpaid interest on and the consideration due upon
conversion of any Note and remaining unclaimed for two years after such principal (including the Redemption Price, the Fundamental
Change Repurchase Price, if applicable), interest or consideration due upon conversion has become due and payable shall be paid
to the Company on request of the Company contained in an Officer’s Certificate, or (if then held by the Company) shall be
discharged from such trust and the Trustee shall have no further liability with respect to such funds; 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 shares of Common Stock, and all liability of the Company as trustee thereof,
shall thereupon cease.


 


Section 4.05. Existence. Subject
to ‎Article 11, the Company shall do or cause to be done all things necessary to preserve and keep in full force and effect
its corporate existence.


 


Section 4.06. Rule 144A Information
Requirement and Annual Reports. (a) 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 Trustee and will, 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.


 






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(b)           
The Company shall file with the Trustee, within 15 days after the same are required to be filed with the Commission (giving
effect to any grace period provided by Rule 12b-25 (or any successor rule) under the Exchange Act, copies of any documents or reports
that the Company is required to file with the Commission pursuant to Section 13 or 15(d) of the Exchange Act). Notwithstanding
the foregoing, the Company shall in no event be required to file with, or otherwise provide or disclose to, the Trustee or any
Holder any information for which the Company is requesting (assuming such request has not been denied), or has received, confidential
treatment from the Commission, or any correspondence with the Commission. Any such document or report that the Company files with
the Commission via the Commission’s EDGAR system (or any successor thereto) shall be deemed to be filed with the Trustee
for purposes of this ‎Section 4.06(b) at the time such documents are filed via the EDGAR system (or any successor thereto);
provided that the Trustee shall have no obligation to determine whether such documents or reports have been filed via the EDGAR
system.


 


(c)           
Delivery of the documents and reports described in subsection ‎(b) above to the Trustee is for information purposes
only, and the Trustee’s receipt of such shall not constitute actual or constructive notice of any information contained therein,
including the Company’s compliance with any of covenants under this Indenture (as to which the Trustee is entitled to rely
on Officer’s Certificates).


 


(d)            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 (including any Notes issued pursuant to the Initial Purchasers’ option to purchase
additional Notes as set forth in the Purchase Agreement), 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 reports on Form 8-K), or the Notes are not otherwise freely
tradable pursuant to Rule 144 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. Such 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 otherwise freely
tradable pursuant to Rule 144 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. As used in this Section 4.06‎(d), 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.


 






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(e)           
If, and for so long as, the Restrictive Legend on the Notes specified in ‎Section 2.05(c) has not been removed, the
Notes are assigned a restricted CUSIP number or the Notes are not otherwise freely tradable pursuant to Rule 144 by Holders other
than the Company’s Affiliates or Holders that were the Company’s Affiliates at any time during the three months immediately
preceding (without restrictions pursuant to U.S. securities laws or the terms of this Indenture or the Notes) as of the 375th day
after the last date of original issuance of such Notes (including any such Notes issued pursuant to the Initial Purchasers’
option to purchase additional Notes as set forth in the Purchase Agreement), the Company shall pay Additional Interest on such
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 in accordance with ‎Section 2.05(c), the Notes are assigned an unrestricted CUSIP number and the Notes are
freely tradable pursuant to Rule 144 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 Restrictive Legend on the Notes shall be deemed removed pursuant to the terms of this
Indenture as provided in ‎Section 2.05(c), and, at such time, the Notes will, pursuant to, and subject to the provisions
of, such Section, be deemed assigned an unrestricted CUSIP number. However, for the avoidance of doubt, for Notes that are not
in certificated form, the Notes will continue to bear Additional Interest pursuant to this paragraph until such time as they are
identified by an unrestricted CUSIP in the facilities of the Depositary or any successor depositary for the Notes, as a result
of completion of the Depositary’s mandatory exchange process or otherwise.


 


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


 


(g)            The
Additional Interest that is payable in accordance with Section 4.06‎(d) or Section 4.06‎(e) shall be in addition
to any Additional Interest that may accrue on the Notes as a result of the Company’s election pursuant to
 ‎Section 6.03. However, in no event shall any Additional Interest that may accrue as a result of the Company’s
failure to timely file any document or report that the Company 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
reports on Form 8-K), as described in Section 4.06(d), together with any Additional Interest payable at the Company’s
election as the remedy for an Event of Default relating to the Company’s failure to comply with its obligations as set
forth in Section 4.06(b), accrue at a rate in excess of 0.50% per annum, regardless of the number of events or circumstances
giving rise to the requirement to pay such Additional Interest.


 


The Company will send written notice to
the Holder of each Note and the Trustee of the commencement and termination of any period on which Additional Interest accrues
on such Note.


 


(h)           
If Additional Interest is payable by the Company pursuant to Section 4.06‎(d) or Section 4.06‎(e), the Company
shall deliver to the Trustee 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.


 






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Section 4.07. 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, but will
suffer and permit the execution of every such power as though no such law had been enacted.


 


Section 4.08. Compliance Certificate;
Statements as to Defaults. The Company shall deliver to the Trustee within 120 days after the end of each fiscal year of the
Company (beginning with the fiscal year ending on December 31, 2020) an Officer’s Certificate stating whether the signer
thereof knows of any Default or Event of Default that occurred during the previous year.


 


In addition, the Company shall deliver to
the Trustee, within 30 days after an Officer of the Company obtains knowledge of the occurrence thereof, written notice of any
Event of Default or Default under this Indenture, its status and what action the Company is taking or proposing to take in respect
thereof; provided that the Company will not be required to deliver such notice if such Event of Default or Default is no
longer continuing or has been cured within the applicable grace period (if any) provided in this Indenture.


 


Section 4.09. Further Instruments and
Acts. Upon request of the Trustee, Paying Agent or Conversion Agent, 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.


 


Article
5

Lists of Holders and Reports by the Company and the Trustee


 


Section 5.01. Lists of Holders. The
Company covenants and agrees that it will furnish or cause to be furnished to the Trustee, semi-annually, not more than 5 days
after each May 15 and November 15 in each year beginning with November 15, 2020, and at such other times as the Trustee may request
in writing, within 5 days after receipt by the Company of any such request (or such lesser time as the Trustee 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 may reasonably
require of the names and addresses of the Holders as of a date not more than 15 days (or such other date as the Trustee 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.


 






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Section 5.02. Preservation and Disclosure
of Lists. The Trustee shall preserve, in as current a form as is reasonably practicable, all information as to the names and
addresses of the Holders contained in the most recent list furnished to it as provided in ‎Section 5.01 or maintained by
the Trustee in its capacity as Note Registrar, if so acting. The Trustee may destroy any list furnished to it as provided in ‎Section
5.01 upon receipt of a new list so furnished.


 


Article
6

Defaults and Remedies


 


Section 6.01. Events of Default.
Each of the following events shall be an “Event of Default” with respect to the Notes:


 


(a)           
default in any payment of interest on any Note when due and payable, and the default continues for a period of 30 days;


 


(b)           
default in the payment of principal of any Note when due and payable on the Maturity Date, upon Optional Redemption, upon
any required repurchase, upon declaration of acceleration or otherwise;


 


(c)           
failure by the Company to comply with its obligation to convert the Notes in accordance with this Indenture upon exercise
of a Holder’s conversion right, and such failure continues for five (5) Business Days;


 


(d)           
failure by the Company to (i) issue a Fundamental Change Company Notice in accordance with ‎Section 15.02(c) when
due, (ii) a Certain Distributions Notification in accordance with ‎Section 14.01(b)(ii) when due or (iii) notice of a Corporate
Event when due and, in the case of this clause (iii), such failure continues for three (3) Business Days;


 


(e)           
failure by the Company to comply with its obligations under ‎Article 11;


 


(f)           
failure by the Company for 60 days after written notice from the Trustee or the Holders of at least 25% in aggregate principal
amount of the Notes then outstanding has been received by the Company and the Trustee to comply with any of its other agreements
contained in the Notes or this Indenture;


 


(g)           
default by the Company or any Significant Subsidiary of the Company with respect to any mortgage, agreement or other instrument
under which there may be outstanding, or by which there may be secured or evidenced, any indebtedness for money borrowed in excess
of $25,000,000 (or its foreign currency equivalent) in the aggregate of the Company and/or any such Significant Subsidiary, whether
such indebtedness now exists or shall hereafter be created (i) resulting in such indebtedness becoming or being declared due and
payable prior to its stated maturity or (ii) constituting a failure to pay the principal or interest of any such indebtedness when
due and payable at its stated maturity, upon required repurchase, upon declaration of acceleration or otherwise, in each case,
after the expiration of any applicable grace period if such acceleration shall not have been rescinded or annulled or such failure
to pay or default shall not have been cured or waived, or such indebtedness shall not have been paid or discharged, as the case
may be, within 30 days after written notice to the Company by the Trustee or to the Company and the Trustee by Holders of at least
25% in aggregate principal amount of Notes then outstanding in accordance with this Indenture;


 






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(h)           
a final judgment or judgments for the payment of $25,000,000 (or its foreign currency equivalent) or more (excluding any
amounts covered by insurance) in the aggregate rendered against the Company or any of the Significant Subsidiaries, which judgment
is not discharged, bonded, paid, waived or stayed within 60 days after (i) the date on which the right to appeal thereof has expired
if no such appeal has commenced, or (ii) the date on which all rights to appeal have been extinguished;


 


(i)           
the Company or any Significant Subsidiary shall commence a voluntary case or other proceeding seeking liquidation, reorganization
or other relief with respect to the Company or any such Significant Subsidiary or its debts under any bankruptcy, insolvency or
other similar law now or hereafter in effect or seeking the appointment of a trustee, receiver, liquidator, custodian or other
similar official of the Company or any such Significant Subsidiary or any substantial part of its property, or shall consent to
any such relief or to the appointment of or taking possession by any such official in an involuntary case or other proceeding commenced
against it, or shall make a general assignment for the benefit of creditors, or shall fail generally to pay its debts as they become
due; or


 


(j)            an
involuntary case or other proceeding shall be commenced against the Company or any Significant Subsidiary seeking
liquidation, reorganization or other relief with respect to the Company or such Significant Subsidiary or its debts under any
bankruptcy, insolvency or other similar law now or hereafter in effect or seeking the appointment of a trustee, receiver,
liquidator, custodian or other similar official of the Company or such Significant Subsidiary or any substantial part of its
property, and such involuntary case or other proceeding shall remain undismissed and unstayed for a period of 60 consecutive
days.


 


Section 6.02. Acceleration; Rescission
and Annulment. If one or more Events of Default shall have occurred and be continuing (whatever the reason for such Event of
Default and whether it shall be voluntary or involuntary or be effected by operation of law or pursuant to any judgment, decree
or order of any court or any order, rule or regulation of any administrative or governmental body), then, and in each and every
such case (other than an Event of Default specified in ‎Section 6.01(i) or ‎Section 6.01(j) with respect to the Company),
unless the principal of all of the Notes shall have already become due and payable, either the Trustee or the Holders of at least
25% in aggregate principal amount of the Notes then outstanding determined in accordance with ‎Section 8.04, by notice in
writing to the Company (and to the Trustee if given by Holders) may declare 100% of the principal of, and accrued and unpaid interest
on, all the then outstanding Notes to be due and payable immediately, and upon any such declaration the same shall become and shall
automatically be immediately due and payable, anything in this Indenture or in the Notes contained to the contrary notwithstanding.
If an Event of Default specified in ‎Section 6.01(i) or ‎Section 6.01(j) with respect to the Company occurs and is
continuing, 100% of the principal of, and accrued and unpaid interest, if any, on, all Notes shall become and shall automatically
be immediately due and payable without any declaration or other act on the part of the Trustee or any Holder.


 






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The immediately preceding paragraph,
however, is subject to the conditions that if, at any time after the principal of the Notes shall have been so declared due
and payable, and before any judgment or decree for the payment of the monies due shall have been obtained or entered as
hereinafter provided, the Company shall pay or shall deposit with the Trustee a sum sufficient to pay installments of accrued
and unpaid interest upon all Notes and the principal of any and all Notes that shall have become due otherwise than by
acceleration (with interest on overdue installments of accrued and unpaid interest, and on such principal at the rate borne
by the Notes at such time) and amounts due to the Trustee pursuant to ‎Section 7.06, and if (1) rescission would not
conflict with any judgment or decree of a court of competent jurisdiction and (2) any and all existing Events of Default
under this Indenture, other than the nonpayment of the principal of and accrued and unpaid interest, if any, on Notes that
shall have become due solely by such acceleration, shall have been cured or waived pursuant to ‎Section 6.09, then and
in every such case (except as provided in the immediately succeeding sentence) the Holders of a majority in aggregate
principal amount of the Notes then outstanding, by written notice to the Company and to the Trustee, may waive all Defaults
or Events of Default with respect to the Notes and rescind and annul such declaration and its consequences and 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 or rescission and annulment shall extend to or shall affect any subsequent Default or Event of
Default, or shall impair any right consequent thereon. Notwithstanding anything to the contrary herein, no such waiver or
rescission and annulment shall extend to or shall affect any Default or Event of Default resulting from (i) the nonpayment of
the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, or accrued and
unpaid interest on, any Notes, (ii) a failure to repurchase any Notes when required or (iii) a failure to pay or deliver, as
the case may be, the consideration due upon conversion of the Notes.


 


Section 6.03. Additional Interest.
Notwithstanding anything in this Indenture or in the Notes to the contrary, to the extent the Company elects, the sole remedy for
an Event of Default relating to the Company’s failure to comply with its obligations as set forth in ‎Section 4.06(b)
shall after the occurrence of such an Event of Default, consist exclusively of the right to receive Additional Interest on the
Notes at a rate equal to (i) 0.25% per annum of the principal amount of the Notes outstanding for each day during the period
beginning on, and including, the date on which such Event of Default first occurs and ending on the earlier of (x) the date on
which such Event of Default is cured or validly waived in accordance with this Indenture and (y) the 180th day immediately following,
and including, the date on which such Event of Default first occurs and (ii) if such Event of Default has not been cured or validly
waived prior to the 181st day immediately following, and including, the date on which such Event of Default first occurs, 0.50%
per annum of the principal amount of the Notes outstanding for each day during the period beginning on, and including, the 181st
calendar day immediately following, and including, the date on which such Event of Default first occurs and ending on the earlier
of (x) the date of which such Event of Default is cured or validly waived in accordance with Indenture and (y) the 360th day immediately
following, and including, the date on which such Event of Default first occurs (in addition to any Additional Interest that may
accrue as a result of a Default as described ‎in ‎Section 4.06(d) or ‎Section 4.06(e), subject to the second
succeeding paragraph). If the Company so elects, such Additional Interest shall be payable in the same manner and on the same dates
as the stated interest payable on the Notes and will accrue on all outstanding Notes from, and including, the date on which the
Event of Default relating to the Company’s failure to comply with its obligations as set forth in ‎Section 4.06(b)
first occurs to, and including, the 360th day thereafter (or such earlier date on which such Event of Default is cured or validly
waived in accordance with this Indenture). On the 361st day after such an Event of Default first occurs (if such Event of Default
is not cured or validly waived in accordance with this Indenture prior to such 361st day), such Additional Interest will cease
to accrue and the Notes shall be subject to acceleration as provided in ‎Section 6.02. The provisions of this paragraph will
not affect the rights of Holders in the event of the occurrence of any Event of Default other than the Company’s failure
to comply with its obligations as set forth in ‎‎‎Section 4.06(b). In the event the Company does not elect to
pay Additional Interest following an Event of Default in accordance with this ‎Section 6.03 or the Company has elected to
make such payment but does not pay the Additional Interest when due, the Notes shall be immediately subject to acceleration as
provided in ‎Section 6.02.


 






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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 relating to the
Company’s failure to comply with its obligations as set forth in ‎Section 4.06(b) in accordance with the
immediately preceding paragraph, the Company must notify all Holders, the Trustee and the Paying Agent in an Officer’s
Certificate of such election on or before the open of business on the Business Day immediately succeeding the date on which
such Event of Default first occurs. Upon the failure to timely give such notice, the Notes shall be immediately subject to
acceleration as provided in ‎Section 6.02.


 


In no event shall Additional Interest payable
at the Company’s election as the remedy for an Event of Default relating to the Company’s failure to comply with its
obligations as set forth in Section 4.06(b) together with any Additional Interest that may accrue as a result of the Company’s
failure to timely file any document or report that the Company 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 reports
on Form 8-K), in accordance with ‎Section 4.06(d) accrue at a rate in excess of 0.50% per annum pursuant to this Indenture,
regardless of the number of events or circumstances giving rise to the requirement to pay such Additional Interest.


 


Section 6.04. Payments of Notes on Default;
Suit Therefor. If an Event of Default described in clause ‎(a) or ‎(b) of ‎Section 6.01 shall have occurred
and be continuing, the Company shall, upon demand of the Trustee, pay to the Trustee, for the benefit of the Holders of the Notes,
the whole amount then due and payable on the Notes for principal and interest, if any, with interest on any overdue principal and
interest, if any, 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 Trustee under ‎Section 7.06. 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 judgment or final decree and may enforce the same against the Company
or any other obligor upon the Notes and collect the moneys 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.


 






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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 Title 11 of
the United States Code, or any other applicable 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 6.04, 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 and accrued and unpaid interest, if any, 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
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 to the Trustee under ‎Section 7.06; and any receiver,
assignee or trustee in bankruptcy or reorganization, liquidator, custodian or similar official is hereby authorized by each
of the Holders 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, to pay to the Trustee any amount due it for reasonable
compensation, expenses, advances and disbursements, including agents and counsel fees, and including any other amounts due to
the Trustee under ‎Section 7.06, 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 any plan of reorganization, arrangement,
adjustment or composition affecting such Holder or the rights of any Holder thereof, or to authorize the Trustee to vote in respect
of the claim of any Holder in any such proceeding.


 






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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 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
any waiver pursuant to ‎Section 6.09 or any rescission and annulment pursuant to ‎Section 6.02 or for any other
reason or shall have been determined adversely to the Trustee, then and in every such case the Company, the Holders 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 and the Trustee shall continue as though no
such proceeding had been instituted.


 


Section 6.05. Application of Monies Collected
by Trustee. Any monies or property collected by the Trustee pursuant to this ‎Article 6 with respect to the Notes shall
be applied in the following order, at the date or dates fixed by 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 (including its agents and counsel) under ‎Section 7.06;


 


Second, in case the principal of
the outstanding Notes shall not have become due and be unpaid, to the payment of interest on, and any cash due upon conversion
of, the Notes in default in the order of the date due of the payments of such interest and cash due upon conversion, as the case
may be, with interest (to the extent that such interest has been collected by the Trustee) upon such overdue payments 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,
if applicable, the payment of the Redemption Price, the Fundamental Change Repurchase Price and any cash due upon conversion) then
owing and unpaid upon the Notes for principal and interest, if any, with interest on the overdue principal 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 (including, if applicable, the Redemption Price, the Fundamental Change Repurchase Price and any cash due upon
conversion) and interest without preference or priority of principal over interest, or of interest over principal 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
(including, if applicable, the Redemption Price, the Fundamental Change Repurchase Price and any cash due upon conversion) and
accrued and unpaid interest; and


 






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


 


Section 6.06. Proceedings by
Holders. Except to enforce the right to receive payment of principal (including, if applicable, the Redemption Price and
the Fundamental Change Repurchase Price) or interest when due, or the contractual right to receive payment or delivery of the
consideration due upon conversion, no Holder of any Note shall have any right by virtue of or by availing of any provision of
this Indenture or the Notes 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:


 


(a)           
such Holder previously shall have given to the Trustee written notice of an Event of Default and of the continuance thereof,
as herein provided;


 


(b)           
Holders of at least 25% in aggregate principal amount of the Notes then outstanding shall have made written request upon
the Trustee to institute such action, suit or proceeding in its own name as Trustee hereunder;


 


(c)           
such Holders shall have offered, and if requested, provided to the Trustee such security or indemnity satisfactory to the
Trustee against any loss, liability or expense to be incurred therein or thereby;


 


(d)           
the Trustee for 60 days after its receipt of such notice, request and offer of such security or indemnity, shall have neglected
or refused to institute any such action, suit or proceeding; and


 


(e)           
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 of the aggregate principal amount of the Notes then outstanding within such 60-day period
pursuant to ‎Section 6.09,


 


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
Holders 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 Holder (it being understood that the Trustee shall not have an affirmative duty to ascertain
whether or not any such direction is unduly prejudicial to any other Holder), 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 Holders (except as otherwise provided herein). For the protection and enforcement of this ‎Section
6.06, each and every Holder and the Trustee shall be entitled to such relief as can be given either at law or in equity.


 






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Notwithstanding any other provision of this
Indenture and any provision of any Note, the contractual right of any Holder to receive payment or delivery, as the case may be,
of (x) the principal (including the Redemption Price, the Fundamental Change Repurchase Price, if applicable) of, (y) accrued and
unpaid interest, if any, on, and (z) the consideration due upon conversion of, such Note, on or after the respective due dates
expressed or provided for in such Note or in this Indenture, and the contractual right to institute suit for the enforcement of
any such payment or delivery, as the case may be, on or after such respective dates, and such rights against the Company shall
not be amended without the consent of such Holder.


 


Section 6.07 . 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 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. The Trustee may maintain a proceeding even if it does
not possess any Notes or does not produce any Notes in the proceeding.


 


Section 6.08. Remedies Cumulative and
Continuing. Except as provided in the last paragraph of ‎Section 2.06, all powers and remedies given by this ‎Article
6 to the Trustee or to the Holders 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 Event of Default or any acquiescence
therein; and, subject to the provisions of ‎Section 6.06, every power and remedy given by this ‎Article 6 or by law
to the Trustee or to the Holders may be exercised from time to time, and as often as shall be deemed expedient, by the Trustee
or by the Holders.


 


Section 6.09. Direction of
Proceedings and Waiver of Defaults by Majority of Holders. The Holders of a majority of the aggregate principal amount of
the Notes at the time outstanding determined in accordance with ‎Section 8.04 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 the 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 (it being
understood that the Trustee shall not have an affirmative duty to ascertain whether or not any such direction is unduly
prejudicial to any other Holder). The Holders of a majority in aggregate principal amount of the Notes at the time
outstanding determined in accordance with ‎Section 8.04 may on behalf of the Holders of all of the Notes waive any past
Default or Event of Default hereunder and its consequences except (i) a default in the payment of accrued and unpaid
interest, if any, on, or the principal (including any Redemption Price, any Fundamental Change Repurchase Price) of, the
Notes when due that has not been cured pursuant to the provisions of ‎Section 6.01, (ii) a failure by the Company to
pay or deliver, as the case may be, the consideration due upon conversion of the Notes or (iii) a default in respect of a
covenant or provision hereof which under ‎Article 10 cannot be modified or amended without the consent of each Holder
of an outstanding Note affected. Upon any such waiver the Company, the Trustee and the Holders of the Notes shall be restored
to their former positions and rights hereunder; but no such waiver shall extend to any subsequent or other Default or Event
of Default or impair any right consequent thereon. Whenever any Default or Event of Default hereunder shall have been waived
as permitted by this ‎Section 6.09, 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 6.10. Notice of Defaults.
The Trustee shall, within 90 days after the occurrence and continuance of a Default of which a Responsible Officer of the Trustee
has actual knowledge deliver to all Holders notice of all such Defaults, unless such Defaults shall have been cured or waived before
the giving of such notice; provided that, except in the case of a Default in the payment of the principal of (including
the Redemption Price, the Fundamental Change Repurchase Price, if applicable), or accrued and unpaid interest on, any of the Notes
or a Default in the payment or delivery of the consideration due upon conversion, the Trustee shall be protected in withholding
such notice if and so long as it in good faith determines that the withholding of such notice is in the interests of the Holders.


 


Section 6.11. 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 Trustee for any action taken or omitted by it as Trustee, 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 6.11 (to the extent
permitted by law) shall not apply to any suit instituted by the Trustee, to any suit instituted by any Holder, or group of Holders,
holding in the aggregate more than 10% in principal amount of the Notes at the time outstanding determined in accordance with ‎Section
8.04, or to any suit instituted by any Holder for the enforcement of the payment of the principal of or accrued and unpaid interest,
if any, on any Note (including, but not limited to, the Redemption Price, the Fundamental Change Repurchase Price with respect
to the Notes being repurchased 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 or receive the consideration due upon conversion in accordance
with the provisions of ‎Article 14.


 






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Article
7

Concerning the Trustee


 


Section 7.01. Duties and
Responsibilities of Trustee. The Trustee, prior to the occurrence of an Event of Default of which a Responsible Officer
of the Trustee has actual knowledge and after the curing or waiver of all Events of Default that may have occurred,
undertakes to perform such duties and only such duties as are specifically set forth in this Indenture. In the event an Event
of Default has occurred and is continuing of which a Responsible Officer of the Trustee has written notice or actual
knowledge, 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 its exercise, as a prudent person would exercise or use in the conduct of such person’s own
affairs under the same circumstances.


 


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


 


(a)           
prior to the occurrence of an Event of Default of which a Responsible Officer of the Trustee has written notice or actual
knowledge and after the curing or waiving of all Events of Default that may have occurred:


 


(i)           
the duties and obligations of the Trustee shall be determined solely by the express provisions of this Indenture, and the
Trustee 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; and


 


(ii)           
in the absence of gross negligence or willful misconduct on the part of the Trustee, the Trustee may conclusively rely,
as to the truth of the statements and the correctness of the opinions expressed therein, upon any certificates or opinions furnished
to the Trustee 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, the Trustee 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);


 






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(b)           
the Trustee shall not be liable for any error of judgment made in good faith by a Responsible Officer or Officers of the
Trustee, unless it shall be proved that the Trustee was grossly negligent in ascertaining the pertinent facts;


 


(c)           
the Trustee shall not 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 of the aggregate principal amount of the Notes at the time outstanding
determined as provided in ‎Section 8.04 relating to the time, method and place of conducting any proceeding for any remedy
available to the Trustee, or exercising any trust or power conferred upon the Trustee, 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 shall be subject to the provisions of this Section;


 


(e)           
the Trustee shall not 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-Note
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, the Trustee may conclusively rely on its failure to receive such notice as reason to act as if no such
event occurred;


 


(g)           
in the event that the Trustee is also acting as Custodian, Note Registrar, Paying Agent, Conversion Agent, Bid Solicitation
Agent or transfer agent hereunder, the rights and protections afforded to the Trustee pursuant to this ‎Article 7 shall also
be afforded to such Custodian, Note Registrar, Paying Agent, Conversion Agent, Bid Solicitation Agent or transfer agent;


 


(h)           
under no circumstances shall the Trustee be liable in its individual capacity for the obligations evidenced by the Notes;
and


 


(i)           
in the absence of written investment direction from the Company, all cash received by the Trustee shall be placed in a non-interest
bearing trust account, and in no event shall the Trustee 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 shall have no written obligation to invest or reinvest any amounts held hereunder
in the absence of such written investment direction from the Company.


 


None of the provisions contained in this
Indenture shall require the Trustee 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. Prior to taking any action under this indenture, the Trustee
will be entitled to, and if requested, be provided, indemnification or security satisfactory to the Trustee against any loss, liability
or expense caused by taking or not taking such action.


 






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Section 7.02. Reliance on Documents,
Opinions, Etc. Except as otherwise provided in ‎Section 7.01:


 


(a)           
the Trustee may conclusively rely and shall be fully protected in acting upon any resolution, certificate, statement, instrument,
opinion, report, notice, request, consent, order, judgment, bond, note, coupon or other paper or document (whether in its original
or facsimile form) 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 Officer’s
Certificate (unless other evidence in respect thereof be herein specifically prescribed); and any Board Resolution may be evidenced
to the Trustee by a copy thereof certified by the Secretary or an Assistant Secretary of the Company;


 


(c)           
the Trustee may consult with counsel of its selection and require an Opinion of Counsel and any written or verbal 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)           
the Trustee shall not 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, judgment, bond, debenture or other paper or
document, but the Trustee, in its discretion, may make such further inquiry or investigation into such facts or matters as it may
see fit, and, if the Trustee shall determine to make such further inquiry or investigation, it shall be entitled to examine the
books, records and premises of the Company, 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;


 


(e)           
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 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;


 


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


 


(g)           
the Trustee shall not be required to give any bond or surety in respect of the performance of its powers and duties hereunder;


 


(h)           
the Trustee 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; and


 






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(i)           
before the Trustee acts or refrains from acting, it may require an Officer’s Certificate or an Opinion of Counsel
or both. The Trustee shall not be liable for any action it takes or omits to take in good faith reliance on such Officer’s
Certificate or Opinion of Counsel;


 


(j)           
the Trustee shall not be responsible or liable for any action it takes or omits to take in good faith which it reasonably
believes to be authorized or within its rights or powers; and


 


(k)            neither
the Trustee nor any of its directors, officers, employees, agents or affiliates shall be responsible for nor have any duty to
monitor the performance or any action of the Company, or any of their respective directors, members, officers, agents,
affiliates or employees, nor shall it have any liability in connection with the malfeasance or nonfeasance by such party. The
Trustee shall not be responsible for any inaccuracy in the information obtained from the Company or for any inaccuracy or
omission in the information obtained from the Company or for any inaccuracy or omission in the records which may result from
such information or any failure by the Trustee to perform its duties as set forth herein as a result of any inaccuracy or
incompleteness.


 


In no event shall the Trustee be liable
for any consequential, punitive, incidental, special or indirect loss or damage of any kind whatsoever (including but not limited
to lost profits), even if the Trustee has been advised of the likelihood of such loss or damage and regardless of the form of action.
The Trustee shall not be charged with knowledge of any Default or Event of Default with respect to the Notes, unless either (1)
a Responsible Officer shall have actual knowledge of such Default or Event of Default or (2) written notice of such Default or
Event of Default shall have been actually received by a Responsible Officer of the Trustee at the Corporate Trust Office of the
Trustee, from the Company or any Holder of the Notes and such notice references the Notes and this Indenture and states that it
is a notice of Default or Event of Default.


 


Section 7.03. No Responsibility for Recitals,
Etc. The recitals contained herein and in the Notes (except in the Trustee’s certificate of authentication) shall be
taken as the statements of the Company, and the Trustee assumes no responsibility for the correctness of the same. The Trustee
makes no representations as to the validity or sufficiency of this Indenture or of the Notes or other transaction documents relating
to the Notes and this Indenture. The Trustee shall not 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 or any
money paid to the Company or upon the Company’s direction under any provision of this Indenture.


 


Section 7.04. Trustee, Paying Agents,
Conversion Agents, Bid Solicitation Agent or Note Registrar May Own Notes. The Trustee, any Paying Agent, any Conversion Agent,
Bid Solicitation Agent (if other than the Company or any Affiliate thereof) 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, Bid Solicitation Agent or Note Registrar.


 






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Section 7.05. Monies to Be Held in Trust.
All monies received by the Trustee 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 in trust hereunder need not be segregated from other funds except to the extent required
by law. The Trustee shall be under no liability for interest on any money received by it hereunder except as may be agreed from
time to time by the Company and the Trustee.


 


Section 7.06. Compensation and Expenses
of Trustee. The Company covenants and agrees to pay to the Trustee, in any capacity under this Indenture, from time to time,
and the Trustee shall be entitled to, compensation for all services rendered by it 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) as mutually agreed to in writing
between the Trustee and the Company, and the Company will pay or reimburse the Trustee upon its request for all reasonable expenses,
disbursements and advances reasonably incurred or made by the Trustee in accordance with any of the provisions of this Indenture
in any capacity hereunder (including the reasonable compensation and the reasonable expenses and disbursements of its agents and
counsel and of all Persons not regularly in its employ and including reasonable attorneys’ fees in connection with enforcement
of its rights to indemnity herein) except any such expense, disbursement or advance as shall have been caused by its gross negligence
or willful misconduct as determined by a final, non-appealable decision of a court of competent jurisdiction. The Company also
covenants to indemnify the Trustee in any capacity under this Indenture and any other document or transaction entered into in
connection herewith and its officers, directors, attorneys, employees and agents and any authenticating agent for, and to hold
them harmless against, any loss, claim (whether asserted by the Company, a Holder or any Person), damage, liability or expense
(including reasonable attorneys’ fees) incurred without gross negligence or willful misconduct on the part of the Trustee,
its officers, directors, attorneys, agents or employees, or such agent or authenticating agent, as the case may be, as determined
by a final, non-appealable decision of a court of competent jurisdiction, and arising out of or in connection with the acceptance
or administration of this Indenture or in any other capacity hereunder, including the costs and expenses of defending themselves
against any claim of liability in the premises. The obligations of the Company under this ‎Section 7.06 to compensate or
indemnify the Trustee and to pay or reimburse the Trustee for expenses, disbursements and advances shall be secured by a senior
lien to which the Notes are hereby made subordinate on all money or property held or collected by the Trustee, except, subject
to the effect of ‎Section 6.05, funds held in trust herewith for the benefit of the Holders of particular Notes. The Trustee’s
right to receive payment of any amounts due under this ‎Section 7.06 shall not be subordinate to any other liability or
indebtedness of the Company. The obligation of the Company under this ‎Section 7.06 shall survive the satisfaction and discharge
of this Indenture, the payment or conversions of the Notes and the earlier resignation or removal of the Trustee. 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 7.06 shall extend to the officers, directors, attorneys, agents and employees of the Trustee.


 


Without prejudice to any other rights available
to the Trustee under applicable law, when the Trustee and its agents and any authenticating agent incur expenses or render services
after an Event of Default specified in ‎Section 6.01(i) or ‎Section 6.01(j) occurs, the expenses and the compensation
for the services are intended to constitute expenses of administration under any bankruptcy, insolvency or similar laws.


 






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Section 7.07. Officer’s Certificate
as Evidence. Except as otherwise provided in ‎Section 7.01, whenever in the administration of the provisions of this
Indenture the Trustee 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, in the absence
of gross negligence and willful misconduct on the part of the Trustee, be deemed to be conclusively proved and established by
an Officer’s Certificate delivered to the Trustee, and such Officer’s Certificate, in the absence of gross negligence
or willful misconduct on the part of the Trustee, shall be full warrant to the Trustee for any action taken or omitted by it under
the provisions of this Indenture upon the faith thereof.


 


Section 7.08. Eligibility of Trustee.
There shall at all times be a Trustee hereunder which shall be a Person that is eligible pursuant to the Trust Indenture Act (as
if, for this purpose, the Trust Indenture Act were applicable hereto) to act as such and has a combined capital and surplus of
at least $50,000,000. 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 7.09. Resignation or Removal
of Trustee. (a) The Trustee may at any time resign by giving written notice
of such resignation to the Company. Upon receiving such notice of resignation, the Company shall promptly appoint a successor trustee
by written instrument, in duplicate, executed by order of the Board of Directors, one copy of which instrument shall be delivered
to the resigning Trustee and one copy to the successor trustee. If no successor trustee shall have been so appointed and have accepted
appointment within 60 days after the giving of such notice of resignation to the Company, the resigning Trustee may, upon ten Business
Days’ notice to the Company and the Holders and at the expense of the Company, petition any court of competent jurisdiction
for the appointment of a successor trustee, or any Holder who has been a bona fide holder of a Note or Notes for at least six months
(or since the date of this Indenture) may, subject to the provisions of ‎Section 6.11, on behalf of himself or herself and
all others similarly situated, petition any such court for the appointment of a successor trustee. Such court may thereupon, after
such notice, if any, as it may deem proper and prescribe, appoint a successor trustee.


 


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


 


(i)           
the Trustee shall cease to be eligible in accordance with the provisions of ‎Section 7.08 and shall fail to resign
after written request therefor by the Company or by any such Holder, or


 




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(ii)           
the Trustee 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 either case, the Company may by a Board Resolution
remove the Trustee and appoint a successor trustee by written instrument, in duplicate, executed by order of the Board of Directors,
one copy of which instrument shall be delivered to the Trustee so removed and one copy to the successor trustee, or, subject to
the provisions of ‎Section 6.11, any Holder who has been a bona fide holder of a Note or Notes for at least six months (or
since the date of this Indenture) may, on behalf of himself or herself and all others similarly situated, petition any court of
competent jurisdiction for the removal of the Trustee and the appointment of a successor trustee. Such court may thereupon, after
such notice, if any, as it may deem proper and prescribe, remove the Trustee and appoint a successor trustee.


 


(c)           
The Holders of a majority in aggregate principal amount of the Notes at the time outstanding, as determined in accordance
with ‎Section 8.04, may at any time, upon 30 days’ prior written notice remove the Trustee and nominate a successor
trustee that shall be deemed appointed as successor trustee unless within ten days after notice to the Company of such nomination
the Company objects thereto, in which case the Trustee so removed or any Holder, upon the terms and conditions and otherwise as
in ‎Section 7.09(a) provided, may petition any court of competent jurisdiction for an appointment of a successor trustee.


 


(d)           
Any resignation or removal of the Trustee and appointment of a successor trustee pursuant to any of the provisions of this
 ‎Section 7.09 shall become effective upon acceptance of appointment by the successor trustee as provided in ‎Section
7.10.


 


Section 7.10. Acceptance by Successor
Trustee. Any successor trustee appointed as provided in ‎Section 7.09 shall execute, acknowledge and deliver to the Company
and to its predecessor trustee an instrument accepting such appointment hereunder, and thereupon the resignation or removal of
the predecessor trustee shall become effective and such successor trustee, 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 herein; but, nevertheless, on the written request of the Company or of the successor trustee, the trustee ceasing to
act shall, upon payment of any amounts then due it pursuant to the provisions of ‎Section 7.06, execute and deliver an instrument
transferring to such successor trustee all the rights and powers of the trustee so ceasing to act. Upon request of any such successor
trustee, the Company shall execute any and all instruments in writing for more fully and certainly vesting in and confirming to
such successor trustee all such rights and powers. Any trustee ceasing to act shall, nevertheless, retain a senior lien to which
the Notes are hereby made subordinate on all money or property held or collected by such trustee 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
7.06.


 




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No successor trustee shall accept appointment
as provided in this ‎Section 7.10 unless at the time of such acceptance such successor trustee shall be eligible under the
provisions of ‎Section 7.08.


 


Upon acceptance of appointment by a successor
trustee as provided in this ‎Section 7.10, each of the Company and the successor trustee, at the written direction and at
the expense of the Company shall deliver or cause to be delivered notice of the succession of such trustee hereunder to the Holders.
If the Company fails to deliver such notice within ten days after acceptance of appointment by the successor trustee, the successor
trustee shall cause such notice to be delivered at the expense of the Company.


 


Section 7.11. Succession by Merger, Etc.
Any corporation or other entity into which the Trustee 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 shall be a party, or any
corporation or other entity succeeding to all or substantially all of the corporate trust business of the Trustee (including the
administration of this Indenture), shall be the successor to the Trustee 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 such corporation or other entity shall be
eligible under the provisions of ‎Section 7.08.


 


In case at the time such successor to the
Trustee 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 may adopt the certificate of authentication of any predecessor trustee or authenticating agent
appointed by such predecessor trustee, 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 Trustee or an authenticating agent appointed by such successor trustee may authenticate
such Notes either in the name of any predecessor trustee hereunder or in the name of the successor trustee; 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 Trustee shall have; provided, however, that the right to adopt the certificate of authentication of any predecessor
trustee or to authenticate Notes in the name of any predecessor trustee shall apply only to its successor or successors by merger,
conversion or consolidation.


 


Section 7.12. Trustee’s
Application for Instructions from the Company. Any application by the Trustee 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 that affects the rights of
the Holders of the Notes under this Indenture) may, at the option of the Trustee, set forth in writing any action proposed to
be taken or omitted by the Trustee under this Indenture and the date on and/or after which such action shall be taken or such
omission shall be effective. The Trustee shall not be liable for any action taken by, or omission of, the Trustee 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 notice to the Company has been deemed to have been given pursuant to
 ‎Section 17.03, 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 shall have received written instructions in
accordance with this Indenture in response to such application specifying the action to be taken or omitted.


 






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Article
8

Concerning the Holders


 


Section 8.01. Action by Holders.
Whenever in this Indenture it is provided that the Holders of a specified percentage of the 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 instruments of similar tenor executed by Holders in person or
by agent or proxy appointed in writing, or (b) by the record of the Holders voting in favor thereof at any meeting of Holders
duly called and held in accordance with the provisions of ‎Article 9, or (c)
by a combination of such instrument or instruments and any such record of such a meeting of Holders. Whenever the Company or the
Trustee solicits the taking of any action by the Holders of the Notes, the Company or the Trustee may fix, but shall not be required
to, in advance of such solicitation, a date as the record date for determining Holders 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 8.02. Proof of Execution by Holders.
Subject to the provisions of ‎Section 7.01, ‎Section 7.02 and ‎Section 9.05, proof of the execution of any instrument
by a Holder 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 in such manner as shall be satisfactory to the Trustee. The holding of Notes shall be proved by the
Note Register or by a certificate of the Note Registrar. The record of any Holders’ meeting shall be proved in the manner
provided in ‎Section 9.06.


 


Section 8.03. Who Are Deemed
Absolute Owners. The Company, the Trustee, 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 (including any Redemption Price and any Fundamental Change Repurchase Price) of and (subject to
 ‎Section 2.03) accrued and unpaid interest on such Note, for conversion of such Note and for all other purposes under
this Indenture; 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. The sole registered holder of a Global Note shall be the Depositary or its
nominee. All such payments or deliveries so made to any Holder for the time being, or upon its order, shall be valid, and, to
the extent of the sums or shares of Common Stock so paid or delivered, effectual to satisfy and discharge the liability for
monies payable or shares deliverable upon any such Note. Notwithstanding anything to the contrary in this Indenture or the
Notes following an Event of Default, any owner 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 8.04. 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, by any Subsidiary thereof or by any Person directly
or indirectly controlling or controlled by or under direct or indirect common control with the Company or any Subsidiary thereof
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 shall be protected in relying on any such direction, consent, waiver or other action, only Notes
with respect to which a Responsible Officer has received an Officer’s Certificate that such Notes 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
8.04 if the pledgee shall establish to the satisfaction of the Trustee the pledgee’s right to so act with respect to such
Notes and that the pledgee is not the Company, a Subsidiary thereof or a Person directly or indirectly controlling or controlled
by or under direct or indirect common control with the Company or a Subsidiary thereof. In the case of a dispute as to such right,
any decision or indecision by the Trustee 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 promptly an Officer’s 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
7.01, the Trustee shall be entitled to accept such Officer’s 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.


 






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Section 8.05. Revocation of Consents;
Future Holders Bound. At any time prior to (but not after) the evidencing to the Trustee, as provided in ‎Section 8.01,
of the taking of any action by the Holders of the percentage of the 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 at its Corporate Trust Office and upon proof of holding
as provided in ‎Section 8.02, 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
9

Holders’ Meetings


 


Section 9.01. Purpose of Meetings.
A meeting of Holders may be called at any time and from time to time pursuant to the provisions of this ‎Article 9 for any
of the following purposes:


 


(a)           
to give any notice to the Company or to the Trustee or to give any directions to the Trustee permitted under this Indenture,
or to consent to the waiving of any Default or Event of Default hereunder (in each case, as permitted under this Indenture) and
its consequences, or to take any other action authorized to be taken by Holders pursuant to any of the provisions of ‎Article
6;


 


(b)           
to remove the Trustee and nominate a successor trustee pursuant to the provisions of ‎Article 7;


 


(c)           
to consent to the execution of an indenture or indentures supplemental hereto pursuant to the provisions of ‎Article
10; or


 


(d)           
to take any other action authorized to be taken by or on behalf of the Holders of any specified aggregate principal amount
of the Notes under any other provision of this Indenture or under applicable law.


 


Section 9.02. Call of Meetings by Trustee.
The Trustee may at any time call a meeting of Holders to take any action specified in ‎Section 9.01, to be held at such time
and at such place as the Trustee shall determine. Notice of every meeting of the Holders, setting forth the time and the place
of such meeting and in general terms the action proposed to be taken at such meeting and the establishment of any record date pursuant
to ‎Section 8.01, shall be delivered to Holders of such Notes. Such notice shall also be delivered to the Company. Such notices
shall be delivered not less than 20 nor more than 90 days prior to the date fixed for the meeting.


 


Any meeting of Holders shall be valid without
notice if the Holders of all Notes then outstanding are present in person or by proxy or if notice is waived before or after the
meeting by the Holders of all Notes then outstanding, and if the Company and the Trustee are either present by duly authorized
representatives or have, before or after the meeting, waived notice.


 


Section 9.03. Call of Meetings by Company
or Holders. In case at any time the Company, pursuant to a Board Resolution, or the Holders of at least 10% of the aggregate
principal amount of the Notes then outstanding, shall have requested the Trustee to call a meeting of Holders, by written request
setting forth in reasonable detail the action proposed to be taken at the meeting, and the Trustee shall not have delivered the
notice of such meeting within 20 days after receipt of such request, then the Company or such Holders may determine the time and
the place for such meeting and may call such meeting to take any action authorized in ‎Section 9.01, by delivering notice
thereof as provided in ‎Section 9.02.


 


Section 9.04. Qualifications for Voting.
To be entitled to vote at any meeting of Holders a Person shall (a) be a Holder of one or more Notes on the record date pertaining
to such meeting or (b) be a Person appointed by an instrument in writing as proxy by a Holder of one or more Notes on the record
date pertaining to such meeting. The only Persons who shall be entitled to be present or to speak at any meeting of Holders shall
be the Persons entitled to vote at such meeting and their counsel and any representatives of the Trustee and its counsel and any
representatives of the Company and its counsel.


 






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Section 9.05. Regulations. Notwithstanding
any other provisions of this Indenture, the Trustee may make such reasonable regulations as it may deem advisable for any meeting
of Holders, in regard to proof of the holding of Notes and of the appointment of proxies, and in regard to the appointment and
duties of inspectors of votes, the submission and examination of proxies, certificates and other evidence of the right to vote,
and such other matters concerning the conduct of the meeting as it shall think fit.


 


The Trustee shall, by an instrument in writing,
appoint a temporary chairman of the meeting, unless the meeting shall have been called by the Company or by Holders as provided
in ‎Section 9.03, in which case the Company or the Holders calling the meeting, as the case may be, shall in like manner
appoint a temporary chairman. A permanent chairman and a permanent secretary of the meeting shall be elected by vote of the Holders
of a majority in aggregate principal amount of the Notes represented at the meeting and entitled to vote at the meeting.


 


Subject to the provisions of ‎Section
8.04, at any meeting of Holders each Holder or proxyholder shall be entitled to one vote for each $1,000 principal amount of Notes
held or represented by him or her; provided, however, that no vote shall be cast or counted at any meeting in respect
of any Note challenged as not outstanding and ruled by the chairman of the meeting to be not outstanding. The chairman of the meeting
shall have no right to vote other than by virtue of Notes held by it or instruments in writing as aforesaid duly designating it
as the proxy to vote on behalf of other Holders. Any meeting of Holders duly called pursuant to the provisions of ‎Section
9.02 or ‎Section 9.03 may be adjourned from time to time by the Holders of a majority of the aggregate principal amount of
Notes represented at the meeting, whether or not constituting a quorum, and the meeting may be held as so adjourned without further
notice.


 


Section 9.06. Voting. The vote
upon any resolution submitted to any meeting of Holders shall be by written ballot on which shall be subscribed the
signatures of the Holders or of their representatives by proxy and the outstanding aggregate principal amount of the Notes
held or represented by them. The permanent chairman of the meeting shall appoint two inspectors of votes who shall count all
votes cast at the meeting for or against any resolution and who shall make and file with the secretary of the meeting their
verified written reports in duplicate of all votes cast at the meeting. A record in duplicate of the proceedings of each
meeting of Holders shall be prepared by the secretary of the meeting and there shall be attached to said record the original
reports of the inspectors of votes on any vote by ballot taken thereat and affidavits by one or more Persons having knowledge
of the facts setting forth a copy of the notice of the meeting and showing that said notice was delivered as provided in
 ‎Section 9.02. The record shall show the aggregate principal amount of the Notes voting in favor of or against any
resolution. The record shall be signed and verified by the affidavits of the permanent chairman and secretary of the meeting
and one of the duplicates shall be delivered to the Company and the other to the Trustee to be preserved by the Trustee, the
latter to have attached thereto the ballots voted at the meeting.


 


Any record so signed and verified shall
be conclusive evidence of the matters therein stated.


 






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Section 9.07. No Delay of Rights by Meeting.
Nothing contained in this ‎Article 9 shall be deemed or construed to authorize or permit, by reason of any call of a meeting
of Holders or any rights expressly or impliedly conferred hereunder to make such call, any hindrance or delay in the exercise of
any right or rights conferred upon or reserved to the Trustee or to the Holders under any of the provisions of this Indenture or
of the Notes. Nothing contained in this ‎Article 9 shall be deemed or construed to limit any Holder’s actions pursuant
to the applicable procedures of the Depositary so long as the Notes are Global Notes.


 


Article
10

Supplemental Indentures


 


Section 10.01. Supplemental Indentures
Without Consent of Holders. Without the consent of any Holder, the Company 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 one or more of the following
purposes:


 


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


 


(b)           
to provide for the assumption by a Successor Company of the obligations of the Company under this Indenture pursuant to
 ‎Article 11;


 


(c)           
to add guarantees with respect to the Notes;


 


(d)           
to secure the Notes;


 


(e)           
to add to the covenants or Events of Default of the Company for the benefit of the Holders or surrender any right or power
conferred upon the Company under this Indenture or the Notes;


 


(f)           
to make any change that does not adversely affect the rights of any Holder under this Indenture or the Notes;


 


(g)           
in connection with any Share Exchange Event, to provide that the Notes are convertible into Reference Property, subject
to the provisions of ‎Section 14.02 and in accordance with ‎Section 14.07;


 


(h)           
to increase the Conversion Rate as provided in this Indenture;


 


(i)           
to provide for the acceptance of appointment by a successor trustee, registrar, Paying Agent, Bid Solicitation Agent or
Conversion Agent pursuant to ‎Section 7.09 or to facilitate the administration of the trusts under this Indenture by more
than one trustee;


 


(j)           
to irrevocably elect or eliminate a Settlement Method or a Specified Dollar Amount, or eliminate the Company’s right
to elect a Settlement Method;


 






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(k)        make
provisions with respect to conversion rights of the Holders pursuant to ‎Section 14.07 and make certain related changes to
the terms of the Notes as required by such Section;


 


(l)        provide
for the issuance of additional Notes;


 


(m)       comply
with the rules of any applicable securities depositary, including the Depositary; or


 


(n)        to
conform the provisions of this Indenture or the Notes to any provision of the “Description of Notes” section of the
Offering Memorandum.


 


Upon the written request of the Company,
the Trustee is hereby authorized to, and shall 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, except that the Trustee shall not be obligated
to, but may in its discretion, enter into any supplemental indenture that affects the Trustee’s own rights, duties, liabilities
or immunities under this Indenture or otherwise.


 


Any supplemental indenture authorized by
the provisions of this ‎Section 10.01 may be executed by the Company and the Trustee without the consent of the Holders of
any of the Notes at the time outstanding, notwithstanding any of the provisions of ‎Section 10.02.


 


Section 10.02. Supplemental
Indentures with Consent of Holders. With the consent (evidenced as provided in ‎Article 8) of the Holders of at
least a majority of the aggregate principal amount of the Notes then outstanding (determined in accordance with
 ‎Article 8 and including, without limitation, consents obtained in connection with a repurchase of, or tender or
exchange offer for, the Notes), the Company 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, the Notes or any supplemental indenture or of modifying in any
manner the rights of the Holders; provided, however, that, without the consent of each Holder of an outstanding
Note affected, no such supplemental indenture shall:


 


(a)           
reduce the principal amount of Notes whose Holders must consent to an amendment, supplement or waiver;


 


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


 


(c)           
reduce the principal of or extend the Maturity Date of any Note other than as permitted or required by this Indenture;


 


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


 


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


 






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(f)           
make any Note payable in money, or at a place of payment, other than that stated in the Note;


 


(g)           
change the ranking of the Notes;


 


(h)           
eliminate the contractual right of any Holder to institute suit for the enforcement of its right to receive payment or delivery,
as the case may be, of the principal (including the Redemption Price or Fundamental Change Repurchase Price, if applicable) of,
accrued and unpaid interest, if any, on, and the consideration due upon conversion of, its Notes, on or after the respective due
dates expressed or provided for in the Notes or this Indenture; or


 


(i)           
make any change in this ‎Article 10 that requires each Holder’s consent or in the waiver provisions in ‎Section
6.02 or ‎Section 6.09.


 


Upon the written request of the Company,
and upon the filing with the Trustee of evidence of the consent of the requisite Holders as aforesaid and subject to ‎Section
10.05, 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, liabilities 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.


 


Holders do not need under this
 ‎Section 10.02 to approve the particular form of any proposed supplemental indenture. It shall be sufficient if such
Holders approve the substance thereof. After any such supplemental indenture becomes effective, the Company shall deliver to
the Holders (with a copy to the Trustee) a notice briefly describing such supplemental indenture. 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 supplemental
indenture.


 


Section 10.03. Effect of Supplemental
Indentures. Upon the execution of any supplemental indenture pursuant to the provisions of this ‎Article 10, 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 Company and the Holders 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 10.04. Notation on Notes.
Notes authenticated and delivered after the execution of any supplemental indenture pursuant to the provisions of this ‎Article
10 may, at the Company’s request and expense, bear a notation as to any matter provided for in such supplemental indenture.
If the Company or the Trustee shall so determine, new Notes so modified as to conform, in the opinion of the Trustee and the Company,
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 upon receipt of a Company Order by the Trustee (or an authenticating agent duly appointed
by the Trustee pursuant to ‎Section 17.10) and delivered in exchange for the Notes then outstanding, upon surrender of such
Notes then outstanding.


 






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Section 10.05. Evidence of Compliance
of Supplemental Indenture to Be Furnished Trustee. In addition to the documents required by ‎Section 17.05, the Trustee
shall receive an Officer’s Certificate and an Opinion of Counsel as conclusive evidence that any supplemental indenture executed
pursuant hereto complies with the requirements of this ‎Article 10 and is permitted or authorized by this Indenture and,
with respect to such Opinion of Counsel, subject to customary exceptions and qualifications, that the supplemental indenture constitutes
the legal, valid and binding obligation of the Company enforceable in accordance with its terms.


 


Article
11

Consolidation, Merger, Sale, Conveyance and Lease


 


Section 11.01. Company May Consolidate,
Etc. on Certain Terms. Subject to the provisions of ‎Section 11.02, the Company shall not consolidate with, merge with
or into, or sell, convey, transfer or lease all or substantially all of its consolidated properties and assets to another Person,
unless:


 


(a)            the
resulting, surviving or transferee Person (the “Successor Company”), if not the Company, shall be a
corporation organized and existing under the laws of the United States of America, any State thereof or the District of
Columbia, and the Successor Company (if not the Company) shall expressly assume, by supplemental indenture all of the
obligations of the Company under the Notes and this Indenture; and


 


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


 


Notwithstanding anything to the contrary
in the foregoing, this ‎Section 11.01 shall not apply to the lease of any of the Company’s or its Subsidiaries’
products pursuant to “Power Purchase Agreements” as described in the Company’s Annual Report on Form 10-K for
the year ended December 31, 2019 or any similar agreements entered into after such date.


 


Section 11.02. Successor Corporation
to Be Substituted. In case of any such consolidation, merger, sale, conveyance, transfer or lease and upon the assumption by
the Successor Company, by supplemental indenture, executed and delivered to the Trustee, of all of the obligations of the Company
under the Notes and this Indenture, such Successor Company (if not the Company) shall succeed to and, except in the case of a lease
of all or substantially all of the Company’s properties and assets, shall be substituted for the Company, with the same effect
as if it had been named herein as the party of the first part, and may thereafter exercise every right and power of, the Company
under this Indenture. Such Successor Company thereupon may cause to be signed, and may issue either in its own name or in the name
of the Company any or all of the Notes issuable hereunder which theretofore shall not have been signed by the Company and delivered
to the Trustee; and, upon the order of such Successor Company instead of the Company and subject to all the terms, conditions and
limitations in this Indenture prescribed, the Trustee shall authenticate and shall deliver, or cause to be authenticated and delivered,
any Notes that previously shall have been signed and delivered by the Officers of the Company to the Trustee for authentication,
and any Notes that such Successor Company thereafter shall cause to be signed and delivered to the Trustee for that purpose. All
the Notes so issued shall in all respects have the same legal rank and benefit under this Indenture as the Notes theretofore or
thereafter issued in accordance with the terms of this Indenture as though all of such Notes had been issued at the date of the
execution hereof. In the event of any such consolidation, merger, sale, conveyance or transfer (but not in the case of a lease),
upon compliance with this ‎Article 11 the Person named as the “Company” in the first paragraph of this Indenture
(or any successor that shall thereafter have become such in the manner prescribed in this ‎Article 11) may be dissolved,
wound up and liquidated at any time thereafter and, except in the case of a lease, such Person shall be released from its liabilities
as obligor and maker of the Notes and from its obligations under this Indenture and the Notes.


 






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In case of any such consolidation, merger,
sale, conveyance, transfer or lease, such changes in phraseology and form (but not in substance) may be made in the Notes thereafter
to be issued as may be appropriate.


 


Section 11.03. Opinion of Counsel
to Be Given to Trustee. If the Company is not the Successor Company, no such consolidation, merger, sale, conveyance,
transfer or lease shall be effective unless the Trustee shall receive an Officer’s Certificate and an Opinion of
Counsel as conclusive evidence that any such consolidation, merger, sale, conveyance, transfer or lease and any such
assumption and, if a supplemental indenture is required in connection with such transaction, such supplemental indenture,
complies with the provisions of this ‎Article 11, that all conditions precedent to such consolidation, merger, sale,
conveyance, transfer or lease have been complied with, and such Opinion of Counsel shall state that this Indenture, the
Notes, and such supplemental indenture, if any, are the legal, valid and binding obligations of the Successor Company,
enforceable against it in accordance with their terms subject to customary qualifications and exceptions.


 


Article
12

Immunity of Incorporators, Stockholders, Officers and Directors


 


Section 12.01. Indenture and Notes Solely
Corporate Obligations. No recourse for the payment of the principal of or accrued and unpaid interest on or the payment or
delivery of consideration due upon conversion of any Note, or the payment or delivery of consideration due upon conversion, nor
for any claim based thereon or otherwise in respect thereof, and no recourse under or upon any obligation, covenant or agreement
of the Company in this Indenture or in any supplemental indenture or in any Note, nor because of the creation of any indebtedness
represented thereby, shall be had against any incorporator, stockholder, employee, agent, Officer or director or Subsidiary, as
such, past, present or future, of the Company or of any successor corporation, either directly or through the Company or any successor
corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty
or otherwise; it being expressly understood that all such liability is hereby expressly waived and released as a condition of,
and as a consideration for, the execution of this Indenture and the issue of the Notes.


 







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Article
13

Intentionally Omitted


 


Article
14

Conversion of Notes


 


Section 14.01. Conversion
Privilege. (a) Subject to and upon compliance with the provisions of this ‎Article 14, each Holder of a Note shall
have the right, at such Holder’s option, to convert all or any portion (if the portion to be converted is $1,000
principal amount or a multiple thereof) of such Note (i) subject to satisfaction of the conditions described in
 ‎Section 14.01(b), at any time prior to the close of business on the Business Day immediately preceding December 1,
2024 under the circumstances and during the periods set forth in ‎Section 14.01(b), and (ii) regardless of the
conditions described in ‎Section 14.01(b), on or after December 1, 2024 and prior to the close of business on the
second Scheduled Trading Day immediately preceding the Maturity Date, in each case, at an initial conversion rate of 198.6196
shares of Common Stock (subject to adjustment as provided in this ‎Article 14, the “Conversion
Rate”) per $1,000 principal amount of Notes (subject to, and in accordance with, the settlement provisions of
 ‎Section 14.02, the “Conversion Obligation”).


 


(b)            (i)
Prior to the close of business on the Business Day immediately preceding December 1, 2024, a Holder may surrender all or any
portion of its Notes for conversion at any time during the five Business Day period immediately after any five consecutive
Trading Day period (the “Measurement 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 this ‎Section 14.01(b)(i), for each
Trading Day of the Measurement Period was less than 98% of the product of the Last Reported Sale Price of the Common Stock
and the Conversion Rate on each such Trading Day (the “Trading Price Condition”). The Trading Prices shall
be determined by the Bid Solicitation Agent pursuant to this ‎Section 14.01(b)(i) and the definition of Trading Price
set forth in this Indenture. The Bid Solicitation Agent (if other than the Company) shall have no obligation to solicit bids
as described above unless the Company has requested such solicitation in writing, and the Company shall have no obligation to
make such request (or, if the Company is acting as Bid Solicitation Agent, the Company shall have no obligation to solicit
such bids) unless a Holder of at least $2,000,000 aggregate principal amount 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 Conversion Rate, at which time the Company shall instruct the Bid
Solicitation Agent in writing (if other than the Company) to solicit, or if the Company is acting as Bid Solicitation Agent,
the Company shall solicit such bids beginning on the next Trading Day and on each successive Trading Day until 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 and the Company shall instruct the three independent nationally recognized
securities dealers to deliver bids to the Bid Solicitation Agent. The Company shall determine the Trading Price per $1,000
principal amount of the Notes for each Trading Day in accordance with the bids so solicited. If (x) the Company is not acting
as Bid Solicitation Agent, and the Company does not, when the Company is required to, instruct the Bid Solicitation Agent in
writing to obtain bids, or if the Company so instructs the Bid Solicitation Agent in writing to obtain bids and the Bid
Solicitation Agent fails to obtain such bids, or (y) the Company is acting as Bid Solicitation Agent and the Company fails to
obtain such bids, then, in either case, the Trading Price per $1,000 principal amount of Notes shall be deemed to be less
than 98% of the product of the Last Reported Sale Price of the Common Stock and the Conversion Rate on each Trading Day of
such failure. At such time as the Company directs the Bid Solicitation Agent (if other than the Company) in writing to
solicit bid quotations, the Company shall provide the Bid Solicitation Agent (if other than the Company) with the names and
contact details of the three independent nationally recognized securities dealers selected by the Company and the Company
shall direct these securities dealers to provide bids to the Bid Solicitation Agent. If the Trading Price condition set forth
above has been met, the Company shall so notify the Holders, the Trustee and the Conversion Agent (if other than the Trustee)
in writing on or within one Business Day of such determination. If, at any time after the Trading Price condition set forth
above 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 Trading Day, the Company shall so notify
the Holders, the Trustee and the Conversion Agent (if other than the Trustee) in writing that the Trading Price Condition is
no longer met and thereafter neither the Company nor the Bid Solicitation Agent (if other than the Company) shall be required
to solicit bids again until another qualifying request is made as provided above.


 






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(ii)           
If, prior to the close of business on the Business Day immediately preceding December 1, 2024, the Company elects to:


 


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


 


(B)             distribute
to all or substantially all holders of the Common Stock the Company’s assets, securities or rights to purchase
securities of the Company (other than in connection with a stockholder rights plan), 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 either case, the
Company shall notify the Holders of the Notes in writing (with a copy to the Trustee and the Conversion Agent (if other than
the Trustee)) (such notification, the “Certain Distributions Notification”) (x) at least 45 Scheduled
Trading Days prior to or (y) if in the Certain Distributions Notification the Company elects Physical Settlement in respect
of any conversions with Conversion Dates that occur after delivery to the Holders of the Certain Distributions Notification
until the Certain Distributions Conversion Period End Date, at least 10 Scheduled Trading Days prior to, in either case, the
Ex-Dividend Date for such issuance or distribution. Once the Company has given such notice, a Holder may surrender all or any
portion of its Notes for conversion at any time until the earlier of (1) the close of business on the Business Day
immediately preceding the Ex-Dividend Date for such issuance or distribution and (2) the Company’s announcement that
such issuance or distribution will not take place (such earlier date and time, the “Certain Distributions Conversion
Period End Date”). Holders may not convert their Notes pursuant to this provision if they participate (other than
in the case of a share split or share combination), at the same time and upon the same terms as holders of Common Stock and
solely as a result of holding the Notes, in any of the transactions described above without having to convert their Notes as
if they held a number of shares of Common Stock equal to the applicable Conversion Rate, as of the Record Date for such
issuance or distribution, multiplied by the principal amount (expressed in thousands) of Notes held by such Holder.


 



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(iii)           
If (i) a transaction or event that constitutes (x) a Fundamental Change or (y) a Make-Whole Fundamental Change
occurs prior to the close of business on the Business Day immediately preceding December 1, 2024, regardless of whether a Holder
has the right to require the Company to repurchase the Notes pursuant to ‎Section 15.02, or (ii) if the Company is a
party to a Share Exchange Event (other than a Share Exchange Event that is solely for the purpose of changing the Company’s
jurisdiction of organization) that (x) does not constitute a Fundamental Change or a Make-Whole Fundamental Change and (y) results
in a reclassification, conversion or exchange of outstanding shares of Common Stock solely into shares of common stock of the surviving
entity and such common stock becomes Reference Property) that occurs prior to the close of business on the Business Day immediately
preceding December 1, 2024 (each such Fundamental Change, Make-Whole Fundamental Change or Share Exchange Event, a “Corporate
Event”)), then, in each case, all or any portion of a Holder’s Notes may be surrendered for conversion at any time
from or after the effective date of the Corporate Event until the earlier of (i) 35 Trading Days after the effective date of such
Corporate Event or if such Corporate Event also constitutes a Fundamental Change, the related Fundamental Change Repurchase Date
and (ii) the second Scheduled Trading Day immediately preceding the Maturity Date. The Company shall notify in writing Holders,
the Trustee and the Conversion Agent (if other than the Trustee) no later than the effective date of such Corporate Event.


 


(iv)           
Prior to the close of business on the Business Day immediately preceding December 1, 2024, a Holder may surrender all or
any portion of its Notes for conversion at any time during any calendar quarter commencing after the calendar quarter ending on
September 30, 2020 (and only during such calendar quarter), 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, and including, the last Trading
Day of the immediately preceding calendar quarter is greater than or equal to 130% of the Conversion Price on each applicable Trading
Day.


 


(v)            If
the Company calls any Notes for redemption, the Holder of the Notes called for redemption pursuant to ‎Article 16, then
a Holder may surrender all or any portion of such Notes for conversion at any time prior to the close of business on the
second Scheduled Trading Day prior to the Redemption Date, even if the Notes are not otherwise convertible at such time.
After that time, the right to convert such Notes on account of the Company’s delivery of the Notice of Redemption shall
expire, unless the Company defaults in the payment of the Redemption Price, in which case a Holder of the Notes called for
redemption may convert such Notes or a portion of such Notes until the Redemption Price has been paid or duly provided for.
Notwithstanding the foregoing, if the Company elects to redeem fewer than all outstanding Notes for Optional Redemption and a
Holder (including, for this purpose, the owner of a beneficial interest in a Global Note) is not able to reasonably
determine, prior to the close of business on the 41st Scheduled Trading Day immediately preceding the relevant Redemption
Date, whether the Notes owned by such Holder (or beneficially owned by such owner of a beneficial interest, as applicable)
are subject to such partial Optional Redemption (and, as a result thereof, convertible in accordance with this ‎Section
14.01(b)(v)) for any reason, then such Holder (or such owner of a beneficial interest, as applicable) shall be entitled to
convert such Notes (or such beneficial interests, as applicable) after the date of the Notice of Redemption until the close
of business on the second Scheduled Trading Day prior to the Redemption Date, regardless of whether such Notes (or such
beneficial interests, as applicable) are subject to such partial Optional Redemption. After that time, the right to convert
Notes on account of the Company’s delivery of a Notice of Redemption shall expire, unless the Company defaults in the
payment of the Redemption Price, in which case such Holder of the Notes (or such owner of a beneficial interest, as
applicable) called for such partial Optional Redemption may convert such Notes (or such beneficial interests, as applicable)
until the Redemption Price has been paid or duly provided for. Any such conversion will be deemed to be of a Note called for
Optional Redemption for purposes of Section 14.03. The Trustee shall not be obligated to make any determination in connection
with this Section 14.01(b)(v).


 






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Section 14.02. Conversion Procedure;
Settlement Upon Conversion.


 


(a)           
Subject to this ‎Section 14.02, ‎Section 14.03(b) and ‎Section 14.07(a), upon conversion of any Note,
the Company shall satisfy its Conversion Obligation by paying or delivering, as the case may be, to the converting Holder, in respect
of each $1,000 principal amount of Notes being converted, cash (“Cash Settlement”), shares of Common Stock,
together with cash, if applicable, in lieu of delivering any fractional share of Common Stock in accordance with subsection ‎(j)
of this ‎Section 14.02 (“Physical Settlement”) or a combination of cash and shares of Common Stock, together
with cash, if applicable, in lieu of delivering any fractional share of Common Stock in accordance with subsection ‎(j) of
this ‎Section 14.02 (“Combination Settlement”), at its election, as set forth in this ‎Section 14.02.


 


(i)           
All conversions occurring (x) on or after December 1, 2024, (y) during a Redemption Period or (z) during the period
after delivery to the Holders of a Certain Distributions Notification until the related Certain Distributions Conversion Period
End Date shall be settled using the same Settlement Method.


 


(ii)           
Except for any conversions for which the relevant Conversion Date occurs (x) on or after December 1, 2024, (y) during a
Redemption Period or (z) during the period after delivery to the Holders of a Certain Distributions Notification until the related
Certain Distributions Conversion Period End Date, the Company shall use the same Settlement Method for all conversions occurring
on the same Conversion Date, but the Company shall not have any obligation to use the same Settlement Method with respect to conversions
that occur on different Conversion Dates.


 


(iii)           
If, in respect of any Conversion Date (or one of the periods described in the fourth immediately succeeding set of parentheses,
as the case may be), the Company elects a Settlement Method, the Company shall deliver a written notice (the “Settlement
Notice”) of the Settlement Method so elected in respect of such Conversion Date (or such period, as the case may be)
to converting Holders, the Trustee and the Conversion Agent (if other than the Trustee) no later than the close of business on
the Trading Day immediately following the relevant Conversion Date (or, in the case of any conversions occurring (x) during a Redemption
Period, in such Redemption Notice, (y) during the period after delivery to the Holders of a Certain Distributions Notification
until the related Certain Distributions Conversion Period End Date in such Certain Distributions Notification or (z) on or after
December 1, 2024, no later than the close of business on the Business Day immediately preceding December 1, 2024). If the Company
does not timely elect a Settlement Method with respect to any conversion prior to the deadline set forth in the immediately preceding
sentence, then the Company shall be deemed to have elected the Default Settlement Method with respect to such Conversion. Such
Settlement Notice shall specify the relevant Settlement Method and in the case of an election of Combination Settlement, the relevant
Settlement Notice shall indicate the Specified Dollar Amount per $1,000 principal amount of Notes. If the Company delivers a Settlement
Notice electing Combination Settlement in respect of its Conversion Obligation but does not indicate a Specified Dollar Amount
then the Specified Dollar Amount for such conversion will be deemed to be $1,000 per $1,000 principal amount of Notes in such Settlement
Notice. For the avoidance of doubt, the Company’s failure to timely elect a Settlement Method or specify the applicable Specified
Dollar Amount will not constitute a default under this Indenture.


 






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In addition, the Company may,
by notice to the Holders of the Notes, the Trustee and the Conversion Agent (if other than the Trustee), irrevocably fix the
Settlement Method to any Settlement Method that the Company is then permitted to elect in accordance with this Indenture that
will apply to all conversions of Notes with a Conversion Date that is on or after the date the Company sends such notice.
Concurrently with providing notice to all the Holders of a change in the Default Settlement Method or an election to
irrevocably fix the Settlement Method, the Company shall promptly issue a report on Form 8-K or press release announcing that
the Company has made such change to the Default Settlement Method or elected to irrevocably fix the Settlement Method, as the
case may be. Notwithstanding the foregoing, no such change in the Default Settlement method or irrevocable election will
affect any Settlement Method theretofore elected (or deemed to be elected) with respect to any Note pursuant to
 ‎Section 14.02. For the avoidance of doubt, such an irrevocable election, if made, will be effective without the need
to amend this Indenture or the Notes, including pursuant to Section 10.01(j). However, the Company may nonetheless choose to
execute such an amendment at its option.


 


(iv)           
The cash, shares of Common Stock or combination of cash and shares of Common Stock in respect of any conversion of Notes
(the “Settlement Amount”) shall be computed as follows:


 


(A)            
if the Company elects to satisfy its Conversion Obligation in respect of such conversion by Physical Settlement, the Company
shall deliver to the converting Holder in respect of each $1,000 principal amount of Notes being converted a number of shares of
Common Stock equal to the Conversion Rate in effect on the Conversion Date (plus cash in lieu of any fractional share of Common
Stock issuable upon conversion);


 


(B)            
if the Company elects to satisfy its Conversion Obligation in respect of such conversion by Cash Settlement, the Company
shall pay to the converting Holder in respect of each $1,000 principal amount of Notes being converted cash in an amount equal
to the sum of the Daily Conversion Values for each of the 40 consecutive Trading Days during the related Observation Period; and


 


(C)            
if the Company elects (or is deemed to have elected) to satisfy its Conversion Obligation in respect of such conversion
by Combination Settlement, the Company shall pay or deliver, as the case may be, in respect of each $1,000 principal amount of
Notes being converted, a Settlement Amount equal to the sum of the Daily Settlement Amounts for each of the 40 consecutive Trading
Days during the related Observation Period.


 






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(v)           
The Daily Settlement Amounts (if applicable) and the Daily Conversion Values (if applicable) shall be determined by the
Company promptly following the last day of the Observation Period. Promptly after such determination of the Daily Settlement Amounts
or the Daily Conversion Values, as the case may be, and the amount of cash payable in lieu of delivering any fractional share of
Common Stock, the Company shall notify the Trustee and the Conversion Agent (if other than the Trustee) in writing of the Daily
Settlement Amounts or the Daily Conversion Values, as the case may be, and the amount of cash payable in lieu of delivering fractional
shares of Common Stock. The Trustee and the Conversion Agent (if other than the Trustee) shall have no responsibility for any such
determination.


 


(b)           
Subject to ‎Section 14.02(e), before any Holder of a Note shall be entitled to convert a Note as set forth above,
such Holder shall (i) in the case of a Global Note, comply with the procedures of the Depositary in effect at that time for converting
a beneficial interest in a Global Note and, if required, pay funds equal to interest payable on the next Interest Payment Date
to which such Holder is not entitled as set forth in ‎Section 14.02(h) and, if required, pay all transfer or similar taxes,
if any, as set forth in Section 14.02‎(d) and Section 14.02 ‎(e) and (ii) in the case of a Physical Note (1) complete,
manually sign and deliver an irrevocable notice to the Conversion Agent as set forth in the Form of Notice of Conversion (a “Notice
of Conversion”) at the office of the Conversion Agent and state in writing therein the principal amount of Notes to
be converted and the name or names (with addresses) in which such Holder wishes the certificate or certificates for any shares
of Common Stock to be delivered upon settlement of the Conversion Obligation to be registered, (2) surrender such Notes, duly
endorsed to the Company or in blank (and accompanied by appropriate endorsement and transfer documents), at the office of the
Conversion Agent, (3) if required, furnish appropriate endorsements and transfer documents and (4) if required, pay funds equal
to the interest payable on the next Interest Payment Date to which such Holder is not entitled as set forth in ‎Section
14.02(h). The Trustee (and, if different, the Conversion Agent) shall notify the Company of any conversion pursuant to this ‎Article
14 on the Conversion Date for such conversion. No Notes may be surrendered for conversion by a Holder thereof if such Holder has
also delivered a Fundamental Change Repurchase Notice to the Company in respect of such Notes and has not validly withdrawn such
Fundamental Change Repurchase Notice in accordance with ‎Section 15.03.


 


If more than one Note shall be surrendered
for conversion at one time by the same Holder, the Conversion Obligation with respect to such Notes shall be computed on the basis
of the aggregate principal amount of the Notes (or specified portions thereof to the extent permitted thereby) so surrendered.


 


(c)           
A Note shall be deemed to have been converted immediately prior to the close of business on the date (the “Conversion
Date”) that the Holder has complied with the requirements set forth in subsection ‎(b) above. Except as set forth
in ‎‎Section 14.03(b) and ‎Section 14.07(a), the Company shall pay or deliver, as the case may be, the consideration
due in respect of the Conversion Obligation on the second Business Day immediately following the relevant Conversion Date, if the
Company elects to satisfy the Conversion Obligation through Physical Settlement, or on the second Business Day immediately following
the last Trading Day of the relevant Observation Period, in the case of any other Settlement Method. If any shares of Common Stock
are due to converting Holders, the Company shall issue or cause to be issued, and deliver to such Holder, or such Holder’s
nominee or nominees, certificates or a book-entry transfer through the Depositary for the full number of shares of Common Stock
to which such Holder shall be entitled in satisfaction of the Company’s Conversion Obligation.


 






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(d)            In
respect of certificated Notes, any Note shall be surrendered for partial conversion, the Company shall execute and the
Trustee shall authenticate and deliver to or upon the written order of the Holder of the Note so surrendered a new Note or
Notes in authorized denominations in an aggregate principal amount equal to the unconverted portion of the surrendered Note,
without payment of any service charge by the converting Holder but, if required by the Company or Trustee, with payment of a
sum sufficient to cover any documentary, stamp or similar issue or transfer tax or similar governmental charge required by
law or that may be imposed in connection therewith as a result of the name of the Holder of the new Notes issued upon such
conversion being different from the name of the Holder of the old Notes surrendered for such conversion.


 


(e)           
If a Holder submits a Note for conversion, the Company shall pay any documentary, stamp or similar issue or transfer tax
or other similar governmental charge due on any issuance of any shares of Common Stock upon conversion, unless the tax is due because
the Holder requests any such shares to be issued in a name other than the Holder’s name, in which case the Holder shall pay
that tax. The Conversion Agent may refuse to deliver the certificates representing the shares of Common Stock being issued in a
name other than the Holder’s name until the Trustee receives a sum sufficient to pay any tax that is due by such Holder in
accordance with the immediately preceding sentence.


 


(f)           
Except as provided in ‎Section 14.04, no adjustment shall be made for dividends on any shares of Common Stock issued
upon the conversion of any Note as provided in this Article 14.


 


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


 


(h)            Upon
conversion, a Holder shall not receive any separate cash payment for accrued and unpaid interest, if any, except as set forth
below and the Company shall not adjust the Conversion Rate for any accrued and unpaid interest on the Notes. The
Company’s settlement of the full Conversion Obligation shall be deemed to satisfy in full its obligation to pay the
principal amount of the Note and accrued and unpaid interest, if any, to, but excluding, the relevant Conversion Date. As a
result, accrued and unpaid interest, if any, to, but excluding, the relevant Conversion Date shall be deemed to be paid in
full rather than cancelled, extinguished or forfeited. Upon a conversion of Notes into a combination of cash and shares of
Common Stock, accrued and unpaid interest will be deemed to be paid first out of the cash paid upon such conversion.
Notwithstanding the foregoing, if Notes are converted after the close of business on a Regular Record Date and prior to the
open of business on the corresponding Interest Payment Date, Holders of such Notes as of the close of business on such
Regular Record Date will receive the full amount of interest payable on such Notes (to, but not including such Interest
Payment Date) on the corresponding Interest Payment Date notwithstanding the conversion. 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, however, must be accompanied by funds equal to the amount of interest payable on the Notes so
converted on the corresponding Interest Payment Date (regardless of whether the converting Holder was the Holder of Record on
such Regular Record Date); provided that no such payment shall be required (1) for conversions following the Regular
Record Date immediately preceding the Maturity Date; (2) if the Company has specified a Fundamental Change Repurchase Date
that is after a Regular Record Date and on or prior to the Business Day immediately succeeding the corresponding Interest
Payment Date; (3) if the Company has specified a Redemption Date that is after a Regular Record Date and on or prior to the
Business Day immediately succeeding the corresponding Interest Payment Date; or (4) to the extent of any overdue
interest, if any overdue interest exists at the time of conversion with respect to such Note. Therefore, for the avoidance of
doubt, all Holders of record on the Regular Record Date immediately preceding the Maturity Date shall receive the full
interest payment due on the Maturity Date in cash regardless of whether their Notes have been converted following such
Regular Record Date.


 






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(i)           
The Person in whose name the certificate for any shares of Common Stock delivered upon conversion is registered shall be
treated as a stockholder of record as of the close of business on the relevant Conversion Date (if the Company elects to satisfy
the related Conversion Obligation by Physical Settlement) or the last Trading Day of the relevant Observation Period (if the Company
elects to satisfy the related Conversion Obligation by Combination Settlement), as the case may be. Upon a conversion of Notes,
such Person shall no longer be a Holder of such Notes surrendered for conversion.


 


(j)           
The Company shall not issue any fractional share of Common Stock upon conversion of the Notes and shall instead pay cash
in lieu of delivering any fractional share of Common Stock issuable upon conversion based on the Daily VWAP on the relevant Conversion
Date (in the case of Physical Settlement) or based on the Daily VWAP on the last Trading Day of the relevant Observation Period
(in the case of Combination Settlement). For each Note surrendered for conversion, if the Company has elected (or is deemed to
have elected) Combination Settlement, the full number of shares that shall be issued upon conversion thereof shall be computed
on the basis of the aggregate Daily Settlement Amounts for the relevant Observation Period and any fractional shares remaining
after such computation shall be paid in cash.


 


Section 14.03. Increased Conversion
Rate Applicable to Certain Notes Surrendered in Connection with Make-Whole Fundamental Changes or During a Redemption Period.
(a) If (x) the Effective Date of a Make-Whole Fundamental Change occurs prior to the Maturity Date and a Holder elects
to convert its Notes in connection with such Make-Whole Fundamental Change or (y) the Company issues a Redemption Notice with
respect to any or all of the Notes pursuant to ‎Section 16.02 (provided that, if the Company sends a Notice of
Redemption for fewer than all of the Notes outstanding, then the Conversion Rate will be increased as set forth herein only
with respect to the Notes called (or deemed called ) for Optional Redemption that are converted in connection therewith, and
not with respect to the Notes not called for Optional Redemption, so that in that circumstance, Holders of Notes not called
for Optional Redemption will not be entitled to an increased Conversion Rate for such Notes as set forth in this Section
14.03 on account of the Optional Redemption; provided further that, notwithstanding the foregoing and for the
avoidance of doubt, Notes (or beneficial interests in a Global Note, as applicable) that are deemed to be called for such
partial Optional Redemption in the circumstances described under Section 14.01(b)(v) and are converted in connection
therewith in accordance with the provisions of this Article 14 will be entitled to an increased Conversion Rate for such
Notes as set forth herein on account of such deemed partial Optional Redemption) and, in each case, a Holder elects to
convert its Notes in connect with such Male-Whole Fundamental Change or during the related Redemption Period, 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 relevant Conversion Date occurs during the period from, and including, the Effective Date of the Make-Whole
Fundamental Change up to, and including, the close of business on the Business Day immediately prior to the related
Fundamental Change Repurchase Date (or, in the case of a Make-Whole Fundamental Change that would have been a Fundamental
Change but for the proviso in clause (b) of the definition thereof, the 35th Trading Day immediately following the Effective
Date of such Make-Whole Fundamental Change) (such period, the “Make-Whole Fundamental Change Period”). For
the avoidance of doubt, the Company may not increase the Conversion Rate pursuant to the provisions of this Section 14.03 on
account of an anticipated Fundamental Change that does not occur.


 






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(b)           
Upon surrender of Notes for conversion in connection with a Make-Whole Fundamental Change pursuant to ‎Section 14.01(b)(iii)
or during a Redemption Period pursuant to ‎Section 14.01(b)(v), the Company shall, at its option, satisfy the related Conversion
Obligation by Physical Settlement, Cash Settlement or Combination Settlement in accordance with ‎Section 14.02 based on the
Conversion Rate as increased to reflect the Additional Shares pursuant to the table below; provided, however, that
if, the Reference Property in any Make-Whole Fundamental Change described in clause (b) of the definition of Fundamental Change
is composed entirely of cash, 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 transaction and shall be deemed to be an amount
of cash per $1,000 principal amount of converted Notes equal to the Conversion Rate (including any increase to reflect the Additional
Shares), multiplied by such Stock Price. In such event, the Conversion Obligation shall be determined and paid to Holders
in cash on the second Business Day following the Conversion Date. The Company shall notify in writing the Holders, the Trustee
and the Conversion Agent (if other than the Trustee) of the Effective Date of any Make-Whole Fundamental Change no later than five
Business Days after such Effective Date.


 


(c)            The
number of Additional Shares, if any, by which the Conversion Rate shall be increased for conversions during the Make-Whole
Fundamental Change Period or during the Redemption Period shall be determined by reference to the table below, based on the
date on which the Make-Whole Fundamental Change occurs or becomes effective (the “Effective Date”) or the
Redemption Notice Date, as applicable and the price (the “Stock Price”) paid (or deemed to be paid) per
share of Common Stock in the Make-Whole Fundamental Change or on the Redemption Notice Date, as applicable, as set forth in
this ‎Section 14.03. If the holders of the Common Stock receive in exchange for their Common Stock only cash in a
Make-Whole Fundamental Change described in clause (b) of the definition of Fundamental Change, the Stock Price shall be the
cash amount paid per share. In the case of any other Make-Whole Fundamental Change or in the case of any Optional Redemption,
the Stock Price shall be the average of the Last Reported Sale Prices of the Common Stock over the five consecutive Trading
Day period ending on, and including, the Trading Day immediately preceding the Effective Date of the Make-Whole Fundamental
Change or the Redemption Notice Date, as the case may be. In the event that a Conversion Date occurs during both a Redemption
Period and a Make-Whole Fundamental Change Period, a Holder of any such Notes to be converted will be entitled to a single
increase to the Conversion Rate with respect to the first to occur of the applicable Redemption Notice Date or Effective
Date, and the later event shall be deemed not to have occurred for purposes of this ‎Section 14.03.


 


(d)           
The Stock Prices set forth in the column headings of the table below shall be adjusted as of any date on which the Conversion
Rate for 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 the table below shall be adjusted in the same manner and at the same time as the Conversion Rate as set forth
in ‎Section 14.04.


 


(e)           
The following table sets forth the number of Additional Shares by which the Conversion Rate shall be increased per $1,000
principal amount of Notes pursuant to this ‎Section 14.03 for each Stock Price and Effective Date or Redemption Notice Date,
as applicable, set forth below:


 


	Effective Date/	 	Stock Price	 
	Redemption Notice Date	 	$4.11	 	 	$4.50	 	 	$5.03	 	 	$6.00	 	 	$7.50	 	 	$10.00	 	 	$15.00	 	 	$20.00	 	 	$25.00	 
	May 18, 2020	 	44.6894	 	 	37.1933	 	 	29.5845	 	 	20.4633	 	 	12.6653	 	 	6.4620	 	 	1.7587	 	 	0.2275	 	 	0.0000	 
	June 1, 2021	 	44.6894	 	 	35.7667	 	 	27.7097	 	 	18.4350	 	 	11.0000	 	 	5.4840	 	 	1.4593	 	 	0.1640	 	 	0.0000	 
	June 1, 2022	 	44.6894	 	 	33.8489	 	 	25.1769	 	 	15.7500	 	 	8.8920	 	 	4.3220	 	 	1.1260	 	 	0.0955	 	 	0.0000	 
	June 1, 2023	 	44.6894	 	 	31.3222	 	 	21.6978	 	 	12.1467	 	 	6.2747	 	 	3.0010	 	 	0.7740	 	 	0.0350	 	 	0.0000	 
	June 1, 2024	 	44.6894	 	 	27.7622	 	 	16.3917	 	 	7.0483	 	 	3.1533	 	 	1.5660	 	 	0.4073	 	 	0.0050	 	 	0.0000	 
	June 1, 2025	 	44.6894	 	 	23.6022	 	 	0.0000	 	 	0.0000	 	 	0.0000	 	 	0.0000	 	 	0.0000	 	 	0.0000	 	 	0.0000	 



 


The exact Stock Prices and Effective Dates
or Redemption Notice Dates, may not be set forth in the table above, in which case:


 






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(i)            if
the Stock Price is between two Stock Prices in the table above or the Effective Date or the Redemption Notice Date, as the
case may be, is between two Effective Dates or Redemption Notice Dates, as applicable, in the table above, the number of
Additional Shares by which the Conversion Rate shall be increased 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 or Redemption Notice Dates, as applicable, based on a 365-day year;


 


(ii)           
if the Stock Price is greater than $25.00 per share (subject to adjustment in the same manner as the Stock Prices set forth
in the column headings of the table above pursuant to subsection (d) above), no Additional Shares shall be added to the Conversion
Rate; and


 


(iii)           
if the Stock Price is less than $4.11 per share (subject to adjustment in the same manner as the Stock Prices set forth
in the column headings of the table above pursuant to subsection (d) above), no Additional Shares shall be added to the Conversion
Rate.


 


Notwithstanding the foregoing, in no event
shall the Conversion Rate per $1,000 principal amount of Notes exceed $243.3090 shares of Common Stock, subject to adjustment in
the same manner as the Conversion Rate pursuant to ‎Section 14.04.


 


(f)           
Nothing in this ‎Section 14.03 shall prevent an adjustment to the Conversion Rate that would otherwise be required
pursuant to ‎Section 14.04.


 


Section 14.04. 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 shall not make any adjustments to the Conversion Rate if Holders of the Notes participate (other than in the case
of (x) a share split or share combination or (y) a tender or exchange offer), at the same time and upon the same terms as
holders of the Common Stock and solely as a result of holding the Notes, in any of the transactions described in this ‎Section
14.04, without having to convert their Notes, as if they held a number of shares of Common Stock equal to the Conversion Rate,
multiplied by the principal amount (expressed in thousands) of Notes held by such Holder.


 


(a)           
If the Company exclusively issues shares of Common Stock as a dividend or distribution on all or substantially all of the
shares of the Common Stock, or if the Company effects a share split or share combination, the Conversion Rate shall be adjusted
based on the following formula:


 





 






    68


     


    

 


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;



 


	CR'	=	the Conversion Rate in effect immediately after the open of business on such Ex-Dividend Date or Effective Date;



 


	OS0	=	the number of shares of Common Stock outstanding
immediately prior to the open of business on such Ex-Dividend Date or Effective Date (before giving effect to any such dividend,
distribution, share split or share combination); and



 


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



 


Any adjustment made under this ‎Section 14.04(a) shall
become effective immediately after the open of business on the Ex-Dividend Date for such dividend or distribution, or immediately
after the open of business on the Effective Date for such share split or share combination, as applicable. If any dividend or distribution
of the type described in this ‎Section 14.04(a) is declared but not so paid or made, the Conversion Rate shall be immediately
readjusted, effective as of the date the Company determines not to pay such dividend or distribution, to the Conversion Rate that
would then be in effect if such dividend or distribution had not been declared.


 


(b)           
If the Company issues to all or substantially all holders of Common Stock any rights, options or warrants (other than in
connection with a stockholder rights plan) entitling them, for a period of not more than 45 calendar days after the announcement
date of such issuance, to subscribe for or purchase shares of Common Stock at a price per share that is 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 date of announcement of such issuance, the Conversion Rate shall be increased 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 issuance;



 


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



 






    69


     


    

 


	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, options or warrants; and



 


	Y	=	the number of shares of Common Stock equal to the aggregate price payable to exercise such rights, options 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, and including, the Trading Day immediately preceding the date of announcement of the issuance of such rights, options or warrants.



 


Any increase made under this ‎Section 14.04(b) shall be
made 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 such issuance. To the extent that shares of the Common Stock are not delivered after the
expiration of such rights, options or warrants, the Conversion Rate shall be decreased to the Conversion Rate that 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. If 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 such Ex-Dividend Date for such issuance had not
occurred.


 


For purposes of this ‎Section 14.04(b)
and ‎Section 14.01(b)(ii)(A), in determining whether any rights, options or warrants entitle the holders of Common Stock
to subscribe for or purchase shares of the Common Stock at a price per share that is less than such average of the Last Reported
Sale Prices of the Common Stock for the 10 consecutive Trading Day period ending on, and including, the Trading Day immediately
preceding the date of announcement of such issuance, and in determining the aggregate offering price of such shares of Common Stock,
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 distributes shares of its Capital Stock, evidences of its indebtedness, other assets or property of the
Company or rights, options or warrants to acquire its Capital Stock or other securities of the Company, to all or substantially
all holders of the Common Stock, excluding (i) dividends, distributions or issuances (including share splits) as to which an adjustment
was effected or will be so effected in accordance with the 1% Provision pursuant to ‎Section 14.04(a) or ‎Section
14.04(b), (ii) except as otherwise described in this Section 14.04(c) and Section 14.11, rights issued pursuant to a stockholder
rights plan of the Company; (iii) dividends or distributions paid exclusively in cash as to which an adjustment was effected pursuant
to ‎Section 14.04(d), (iv) dividends or distributions of Reference Property in a transaction described in ‎Section
14.07 and (iv) Spin-Offs as to which the provisions set forth below in this ‎Section 14.04(c) shall apply (any of such
shares of Capital Stock, evidences of indebtedness, other assets or property or rights, options or warrants to acquire Capital
Stock or other securities, the “Distributed Property”), then the Conversion Rate shall be increased based on
the following formula:


 




    70


     


    

 


 





 


where,


 


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



 


	CR'	=	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, and including, the Trading Day immediately preceding
the Ex-Dividend Date for such distribution; and



 


	FMV	=	the fair market value (as determined by the Company) of the Distributed Property with respect to each outstanding share
of the Common Stock on the Ex-Dividend Date for such distribution.



 


Any increase made under the portion of this
 ‎Section 14.04(c) above shall become effective immediately after the open of business on the Ex-Dividend Date for such distribution.
If such distribution is not paid or made, the Conversion Rate shall be decreased to the Conversion Rate that would then be in effect
if such distribution had not been declared. If the Company issues rights, options or warrants, the Company shall readjust the Conversion
Rate to the extent any of these rights, options or warrants are not exercised before they expire. Notwithstanding the foregoing,
if “FMV” (as defined above) is equal to or greater than “SP0” (as defined above), in lieu of
the foregoing increase, each Holder of a Note shall receive, in respect of each $1,000 principal amount thereof, at the same time
and upon the same terms as holders of the Common Stock receive the Distributed Property, the amount and kind of Distributed Property
such Holder would have received if such Holder owned a number of shares of Common Stock equal to the Conversion Rate in effect
on the Ex-Dividend Date for the distribution.


 


With respect to an adjustment pursuant to
this ‎Section 14.04(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 any Subsidiary or other business unit of the
Company, that are, or, when issued, will be, listed or admitted for trading on a U.S. national securities exchange (a “Spin-Off”),
the Conversion Rate shall be increased based on the following formula:


 





 




    71


     


    

 


where,




 


	CR0	=	the Conversion Rate in effect immediately prior
to the end of the Valuation Period;



 


	CR'	=	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 the Common Stock applicable to one share of the Common
Stock (determined by reference to the definition of Last Reported Sale Price as set forth in ‎Section 1.01 as if references
therein to Common Stock were to such Capital Stock or similar equity interest) over the first 10 consecutive Trading Day period
after, and including, the Ex-Dividend Date of the Spin-Off (the “Valuation Period”); provided that if
there is no Last Reported Sale Price of the Capital Stock or similar equity interest distributed to holders of Common Stock on
such Ex-Dividend Date, the “Valuation Period” shall be the first 10 consecutive Trading Day period after, and
including, the first date such Last Reported Sale Price is available; and



 


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



 


The increase to the Conversion Rate under the preceding paragraph
shall occur at the close of business on the last Trading Day of the Valuation Period; provided that (x) in respect of any
conversion of Notes for which Physical Settlement is applicable, if the relevant Conversion Date occurs during the Valuation Period,
references to “10” in the portion of this ‎Section 14.04(c) related to Spin-Offs 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 Conversion Rate and (y) in respect of any conversion of Notes for which Cash Settlement or Combination Settlement is applicable,
for any Trading Day that falls within the relevant Observation Period for such conversion and within the Valuation Period, references
to “10” in the portion of this ‎Section 14.04(c) related to Spin-Offs shall be deemed replaced with such lesser
number of Trading Days as have elapsed between the Ex-Dividend Date of such Spin-Off and such Trading Day in determining the Conversion
Rate as of such Trading Day. If any dividend or distribution that constitutes a Spin-Off is declared but not so paid or made, the
Conversion Rate shall be immediately decreased, effective as of the date the Board of Directors determines not to pay or make such
dividend or distribution, to the Conversion Rate that would then be in effect if such dividend or distribution had not been declared
or announced.


 






    72


     


    

 


For purposes of this ‎Section 14.04(c)
(and subject in all respect to ‎Section 14.11), rights, options or warrants distributed by the Company to all holders of
the Common Stock entitling them to subscribe for or purchase shares of the Company’s Capital Stock, including Common Stock
(either initially or under certain circumstances), which rights, options or warrants, until the occurrence of a specified event
or events (“Trigger Event”): (i) are deemed to be transferred with such shares of the Common Stock; (ii) are
not exercisable; and (iii) are also issued in respect of future issuances of the Common Stock, shall be deemed not to have been
distributed for purposes of this ‎Section 14.04(c) (and no adjustment to the Conversion Rate under this ‎Section 14.04(c)
will be required) until the occurrence of the earliest Trigger Event, whereupon such rights, options or 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
14.04(c). If any such right, option or warrant, including any such existing rights, options or warrants distributed prior to the
date of this Indenture, are subject to events, upon the occurrence of which such rights, options 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 with respect to new rights, options or warrants with
such rights (in which case the existing rights, options or warrants shall be deemed to terminate and expire on such date without
exercise by any of the holders thereof). In addition, in the event of any distribution (or deemed distribution) of rights, options
or warrants, or any Trigger Event or other event (of the type described in the immediately 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
14.04(c) was made, (1) in the case of any such rights, options or warrants that shall all have been redeemed or purchased without
exercise by any holders thereof, upon such final redemption or purchase (x) the Conversion Rate shall be readjusted as if such
rights, options 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 case may be, as though it were a cash distribution, equal to the per
share redemption or purchase price received by a holder or holders of Common Stock with respect to such rights, options or warrants
(assuming such holder had retained such rights, options 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, options or warrants that shall have expired or been terminated without
exercise by any holders thereof, the Conversion Rate shall be readjusted as if such rights, options and warrants had not been
issued.


 


For purposes of ‎Section 14.04(a),
 ‎Section 14.04(b) and this ‎Section 14.04(c), if any dividend or distribution to which this ‎Section 14.04(c)
is applicable also includes one or both of:


 


(A)       a
dividend or distribution of shares of Common Stock to which ‎Section 14.04(a) is applicable (the “Clause A Distribution”);
or


 


(B)       a
dividend or distribution of rights, options or warrants to which ‎Section 14.04(b) is applicable (the “Clause B
Distribution”),


 


then, in either case, (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 14.04(c) is applicable (the “Clause C Distribution”) and any
Conversion Rate adjustment required by this ‎Section 14.04(c) with respect to such Clause C Distribution 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 14.04(a) and ‎Section 14.04(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 Effective Date” within the
meaning of ‎Section 14.04(a) or “outstanding immediately prior to the open of business on such Ex-Dividend
Date” within the meaning of ‎Section 14.04(b).


 






    73


     


    

 


(d)           
If the Company pays or makes any cash dividend or distribution to all or substantially all holders of the 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;



 


	CR'	=	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 all or substantially all holders of the Common Stock.



 


Any increase pursuant to this ‎Section 14.04(d) shall
become effective immediately after the open of business on the Ex-Dividend Date for such dividend or 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. Notwithstanding the foregoing, if “C” (as defined above) is equal to or greater than “SP0”
(as defined above), in lieu of the foregoing increase, each Holder of a Note shall receive, for each $1,000 principal amount of
Notes it holds, at the same time and upon the same terms as holders of shares of the Common Stock, the amount of cash that such
Holder would have received if such Holder owned a number of shares of Common Stock equal to the Conversion Rate in effect on the
Ex-Dividend Date for such cash dividend or distribution.


 


(e)            If
the Company or any of its Subsidiaries make a payment in respect of a tender or exchange offer for the Common Stock that is
subject to the then-applicable tender offer rules under the Exchange Act, other than any odd-lot tender offer, to the extent
that the cash and value of any other consideration included in the payment per share of the Common Stock exceeds the average
of the Last Reported Sale Prices of the Common Stock over the 10 consecutive Trading Day period commencing on, and including,
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:


 






    74


     


    

 





 


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 (the “expiration date”);



 


	CR'	=	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 expiration date;



 


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



 


	OS0	=	the number of shares of Common Stock outstanding
immediately prior to the expiration date (prior to giving effect to the purchase of all shares of Common Stock accepted for purchase
or exchange in such tender or exchange offer);



 


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



 


	SP'	=	the average of the Last Reported Sale Prices of the Common Stock over the 10 consecutive Trading Day period commencing
on, and including, the Trading Day next succeeding the expiration date.



 


The increase to the Conversion Rate under this ‎Section
14.04(e) shall occur at the close of business on the 10th Trading Day immediately following, and including, the Trading Day next
succeeding the expiration date; provided that (x) in respect of any conversion of Notes for which Physical Settlement is
applicable, if the relevant Conversion Date occurs during the 10 Trading Days immediately following, and including, the Trading
Day next succeeding the expiration date of any tender or exchange offer, references to “10” or “10th” in
this ‎Section 14.04(e) shall be deemed replaced with such lesser number of Trading Days as have elapsed between the date
that such tender or exchange offer expires and the Conversion Date
in determining the Conversion Rate and (y) in respect of any conversion of Notes for which Cash Settlement or Combination Settlement
is applicable, for any Trading Day that falls within the relevant Observation Period for such conversion and within the 10 Trading
Days immediately following, and including, the Trading Day next succeeding the expiration date of any tender or exchange offer,
references to “10” or “10th” in this ‎Section 14.04(e) 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 such Trading Day in determining
the Conversion Rate as of such Trading Day. In the event that the Company or the Subsidiaries is obligated to purchase shares of
Common Stock pursuant to any such tender offer or exchange offer, but the Company or such Subsidiary is permanently prevented by
applicable law from consummating any such purchases, or any such purchases are rescinded, then the Conversion Rate shall be decreased
to be the Conversion Rate that would then be in effect if such tender offer or exchange offer had not been made or had been made
only in respect of the purchases that have been consummated and not rescinded.


 




    75


     


    




 


(f)           
Notwithstanding this ‎Section 14.04 or any other provision of this Indenture or the Notes, if a Conversion Rate adjustment
becomes effective on any Ex-Dividend Date, 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 the shares of Common Stock as of the related Conversion
Date as described under ‎Section 14.02(i) based on an adjusted Conversion Rate for such Ex-Dividend Date, then, notwithstanding
the Conversion Rate adjustment provisions in this ‎Section 14.04, the Conversion Rate adjustment relating to such Ex-Dividend
Date shall not be made for such converting Holder. Instead, such Holder shall be treated as if such Holder were the record owner
of the shares of Common Stock on an unadjusted basis and participate in the related dividend, distribution or other event giving
rise to such adjustment.


 


(g)           
Except as stated herein, the Company shall not adjust the Conversion Rate for the issuance of shares of the Common Stock
or any securities convertible into or exchangeable for shares of the Common Stock or the right to purchase shares of the Common
Stock or such convertible or exchangeable securities.


 


(h)           
In addition to those adjustments required by clauses ‎(a), ‎(b), ‎(c), ‎(d) and ‎(e) of this
 ‎Section 14.04, and subject to the applicable listing standards of The Nasdaq Capital Market, the Company from time to time
may increase the Conversion Rate by any amount for a period of at least 20 Business Days if the Board of Directors determines that
such increase would be in the Company’s best interest. In addition, subject to the applicable listing standards of The Nasdaq
Capital Market, the Company may (but is not required to) increase the applicable Conversion Rate to avoid or diminish income tax
to holders of Common Stock or rights to purchase shares of Common Stock in connection with a dividend or distribution of shares
of Common Stock (or rights to acquire shares of Common Stock) or similar event.


 


(i)            Except
as stated herein, the Company shall not adjust the Conversion Rate for the issuance of shares of the Common Stock or any
securities convertible into or exchangeable for shares of Common Stock or the right to purchase shares of Common Stock or
such convertible or exchangeable securities. For example, the Conversion Rate shall not be adjusted:


 


(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;


 






    76


     


    

 


(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 or incentive plan or program of or assumed by the Company or any of the Company’s
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) of this subsection and outstanding as of the date the Notes were first issued (other
than a rights plan as described in Section 14.04(c) and Section 14.11);


 


(iv)           
upon the repurchase of shares of Common Stock pursuant to an open-market share repurchase program or other buy-back transaction
(including, without limitation, through any structured derivative transactions such as accelerated share purchase derivatives)
that is not a tender offer or exchange offer of the nature described in ‎Section 14.04(e);


 


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


 


(vi)           
for accrued and unpaid interest, if any.


 


(j)           
If an adjustment to the Conversion Rate otherwise required by this Section 14.04 would result in a change of less than 1%
to the Conversion Rate, then, notwithstanding the foregoing, the Company may, at its election by written notice in the form of
an Officer’s Certificate to the Holders, the Trustee and the Conversion Agent (if other than the Trustee) promptly after
the date such adjustment is otherwise required to be made, defer and carry forward such adjustment, except that all such deferred
adjustments must be given effect immediately upon the earliest to occur of the following: (i) when all such deferred adjustments
would result in an aggregate change of at least 1% to on the Conversion Rate; (ii) on the Conversion Date of (if Physical Settlement
applies to such conversion) or, each Trading Day of the applicable Observation Period for (if Cash or Combination Settlement applies
to such conversion) any Note; (iii) the date a Fundamental Change or a Make-Whole Fundamental Change occurs; and (iv) December
1, 2024. The provisions described in this Section 14.04(j) are referred to herein as the “1% Provision.” All
the calculations and other determinations under this Article 14 shall be made by the Company and shall be made to the nearest one
ten thousandth (1/10,000th) of a share.


 


(k)           
Whenever the Conversion Rate is adjusted as herein provided, the Company shall promptly file with the Trustee (and the Conversion
Agent if not the Trustee) an Officer’s Certificate setting forth (i) the adjusted Conversion Rate, (ii) the subsection of
this Section 14.04 pursuant to which such adjustment has been made, showing in reasonable detail the facts upon which such adjustment
is based and (iii) the date as of which such adjustment is effective (which certificates shall be conclusive evidence of the accuracy
of such adjustment absent manifest error). Unless and until a Responsible Officer of the Trustee shall have received such Officer’s
Certificate, the Trustee 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 written 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 deliver such notice of such adjustment of the Conversion Rate
to each Holder (with a copy to the Trustee). Failure to deliver such notice shall not affect the legality or validity of any such
adjustment.


 






    77


     


    

 


(l)           
For purposes of this ‎Section 14.04, the number of shares of Common Stock at any time outstanding shall not include
shares of Common Stock 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 of Common Stock issuable in respect of
scrip certificates issued in lieu of fractions of shares of Common Stock.


 


Section 14.05. Adjustments of Prices.
Whenever any provision of this Indenture requires the Company to calculate the Last Reported Sale Prices, the Daily VWAPs,
the Daily Conversion Values or the Daily Settlement Amounts over a span of multiple days (including, without limitation, an Observation
Period and the period, if any, for determining the Stock Price for purposes of a Make-Whole Fundamental Change or Notice of Redemption),
the Company shall make appropriate adjustments to each 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, Effective Date or expiration date of the
event occurs, at any time during the period when the Last Reported Sale Prices, the Daily VWAPs, the Daily Conversion Values or
the Daily Settlement Amounts are to be calculated.


 


Section 14.06. Shares to Be Fully Paid.
The Company shall provide, free from preemptive rights, out of its authorized but unissued shares or shares held in treasury, sufficient
shares of Common Stock to provide for conversion of the Notes from time to time as such Notes are presented for conversion (assuming
delivery of the maximum number of Additional Shares pursuant to ‎Section 14.03 and that at the time of computation of such
number of shares, all such Notes would be converted by a single Holder and that Physical Settlement is applicable).


 


Section 14.07. Effect of Recapitalizations,
Reclassifications and Changes of the Common Stock.


 


(a)           
In the case of:


 


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


 


(ii)           
any consolidation, merger or combination involving the Company,


 


(iii)           
any sale, lease or other transfer to a third party of all or substantially all of the Company’s and the Company’s
Subsidiaries’ consolidated assets, taken as a whole or


 






    78


     


    

 


(iv)            any
statutory share exchange, in each case, as a result of which the Common Stock would be converted into, or exchanged for,
stock, other securities, other property or assets (including cash or any combination thereof) (any such event, a
 “Share Exchange Event”), then, at the effective time of such Share Exchange Event, the Company or the
Successor Company, as the case may be, will execute with the Trustee a supplemental indenture, without the consent of
Holders, providing that at and after the effective time of such Share Exchange Event, the right to convert each $1,000
principal amount of Notes shall be changed into a right to convert such principal amount of Notes 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 immediately prior to such Share Exchange Event would have owned
or been entitled to receive (the “Reference Property”, with each “unit of Reference
Property” meaning the kind and amount of Reference Property that a holder of one share of Common Stock is entitled
to receive) upon such Share Exchange Event. However, at and after the effective time of the Share Exchange Event (A) the
Company or the Successor Company, as the case may be, shall continue to have the right to determine the form of consideration
to be paid or delivered, as the case may be, upon conversion of Notes in accordance with ‎Section 14.02 and (B) (I) any
amount payable in cash upon conversion of the Notes in accordance with ‎Section 14.02 shall continue to be payable in
cash, (II) any shares of Common Stock that the Company would have been required to deliver upon conversion of the Notes in
accordance with ‎Section 14.02 shall instead be deliverable in the amount and type of Reference Property that a holder
of that number of shares of Common Stock would have received in such Share Exchange Event and (III) the Daily VWAP shall be
calculated based on the value of a unit of Reference Property.


 


If the Share Exchange Event causes the
Common Stock to be 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 (i) the Reference Property into which the Notes will
be convertible shall be deemed to be the weighted average of the types and amounts of consideration actually received by the
holders of Common Stock, and (ii) the unit of Reference Property for purposes of the immediately preceding paragraph shall
refer to the consideration referred to in clause (i) attributable to one share of Common Stock. If the holders of the Common
Stock receive only cash in such Share Exchange Event, then for all conversions for which the relevant Conversion Date occurs
after the effective date of such Share Exchange Event (A) the consideration due upon conversion of each $1,000 principal
amount of Notes shall be solely cash in an amount equal to the Conversion Rate in effect on the Conversion Date (as may be
increased by any Additional Shares pursuant to ‎Section 14.03), multiplied by the price paid per share of Common
Stock in such Share Exchange Event and (B) the Company shall satisfy the Conversion Obligation by paying such cash amount to
converting Holders on the second Business Day immediately following the relevant Conversion Date. The Company shall notify
Holders, the Trustee and the Conversion Agent (if other than the Trustee) in writing of such weighted average as soon as
reasonably practicable after such determination is made.


 






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If the Reference Property in respect of
any Share Exchange Event includes, in whole or in part, shares of Common Equity or securities convertible into or exchangeable
for shares of Common Equity, the such supplemental indenture described in the second immediately preceding paragraph shall provide
for anti-dilution and other adjustments that are as nearly equivalent as possible to the adjustments provided for in this ‎Article
14 with respect to the portion of Reference Property consisting of such Common Equity or securities convertible into or exchangeable
for shares of Common Equity. If, in the case of any Share Exchange Event, the Reference Property includes shares of stock, securities
or other property or assets (other than cash and/or cash equivalents) of a Person other than the Company or the Successor Company,
as the case may be, in such Share Exchange Event, then if such other Person is an Affiliate of the Company or such Successor Company,
such supplemental indenture shall also be executed by such other Person. Such supplemental indenture shall contain such additional
provisions to protect the interests of the Holders as the Board of Directors reasonably considers necessary by reason of the foregoing,
including the provisions providing for the purchase rights set forth in ‎Article 15.


 


(b)           
When the Company executes a supplemental indenture pursuant to subsection ‎(a) of this ‎Section 14.07, the Company
shall promptly file with the Trustee an Officer’s Certificate briefly stating the reasons therefor, the kind or amount of
cash, securities or property or asset that will comprise a unit of Reference Property after any such Share Exchange Event, any
adjustment to be made with respect thereto and that all conditions precedent have been complied with, and shall promptly deliver
or cause to be delivered notice thereof to all Holders. The Company shall cause notice of the execution of such supplemental indenture
to be delivered to each Holder within 20 days after execution thereof. Failure to deliver such notice shall not affect the legality
or validity of such supplemental indenture.


 


(c)           
The Company shall not become a party to any Share Exchange Event unless its terms are consistent with this ‎‎Section
14.07. None of the foregoing provisions shall affect the right of a holder of Notes to convert its Notes into cash, shares of Common
Stock or a combination of cash and shares of Common Stock, as applicable, as set forth in ‎Section 14.01 and ‎Section
14.02 prior to the effective date of such Share Exchange Event.


 


(d)           
The above provisions of this Section shall similarly apply to successive Share Exchange Events.


 


(e)           
Upon the consummation of any Share Exchange Event, references to “Common Stock” shall be deemed to refer to
any Reference Property that constitutes capital stock after giving effect to such Share Exchange Event.


 


Section 14.08. Certain Covenants.
(a) The Company covenants that all shares of Common Stock issued upon conversion
of Notes will be fully paid and non-assessable by the Company and free from all taxes, liens and charges with respect to the issue
thereof.


  






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(b)           
The Company covenants that, if any shares of Common Stock to be provided for the purpose of conversion of Notes hereunder
require registration with or approval of any governmental authority under any federal or state law before such shares of Common
Stock may be validly issued upon conversion, the Company will, to the extent then permitted by the rules and interpretations of
the Commission, secure such registration or approval, as the case may be.



 


(c)           
The Company further covenants that if at any time the Common Stock shall be listed on any national securities exchange or
automated quotation system the Company will list and keep listed, so long as the Common Stock shall be so listed on such exchange
or automated quotation system, any Common Stock issuable upon conversion of the Notes.


 


Section 14.09. Responsibility of
Trustee. The Trustee and any other Conversion Agent shall not at any time be under any duty or responsibility to any
Holder to determine the Conversion Rate (or any adjustment thereto) or whether any facts exist that may require any
adjustment (including any increase) of the Conversion Rate, or with respect to the nature or extent or calculation of any
such adjustment when made, or with respect to the method employed, or herein or in any supplemental indenture provided to be
employed, in making the same. The Trustee and any other 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 securities, property or cash that may at
any time be issued or delivered upon the conversion of any Note; and the Trustee and any other Conversion Agent make no
representations with respect thereto. Neither the Trustee nor any 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 Note for the purpose of conversion or to comply with any of the duties, responsibilities or
covenants of the Company contained in this Article. Without limiting the generality of the foregoing, neither the Trustee nor
any Conversion Agent shall be under any responsibility to determine the correctness of any provisions contained in any
supplemental indenture entered into pursuant to ‎Section 14.07 relating either to the kind or amount of shares of stock
or securities or property (including cash) receivable by Holders upon the conversion of their Notes after any event referred
to in such ‎Section 14.07 or to any adjustment to be made with respect thereto, but, subject to the provisions of
 ‎Section 7.01, may accept (without any independent investigation) as conclusive evidence of the correctness of any such
provisions, and shall be protected in conclusively relying upon, the Officer’s Certificate (which the Company shall be
obligated to file with the Trustee prior to the execution of any such supplemental indenture) with respect thereto. Neither
the Trustee nor the Conversion Agent shall be responsible for determining whether any event contemplated by ‎Section
14.01(b) has occurred that makes the Notes eligible for conversion or no longer eligible therefor until the Company has
delivered to the Trustee and the Conversion Agent the notices referred to in ‎Section 14.01(b) with respect to the
commencement or termination of such conversion rights, on which notices the Trustee and the Conversion Agent may conclusively
rely, and the Company agrees to deliver such notices to the Trustee and the Conversion Agent immediately after the occurrence
of any such event or at such other times as shall be provided for in ‎Section 14.01(b). Neither the Trustee nor any
other agent acting under this Indenture (other than the Company, if acting in such capacity) shall have any obligation to
make any calculation or to determine whether the Notes may be surrendered for conversion pursuant to this Indenture, or to
notify the Company or the Depositary or any of the Holders if the Notes have become convertible pursuant to the terms of this
Indenture.


 






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Section 14.10. Reserved.


 






Section 14.11. Stockholder Rights Plans.
If the Company has a stockholder rights plan in effect upon conversion of the Notes, each share of Common Stock, if any, issued
upon such conversion 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 such
stockholder rights plan, as the same may be amended from time to time. However, if, prior to any conversion of Notes, the rights
have separated from the shares of Common Stock in accordance with the provisions of the applicable stockholder rights plan so that
the Holders would not be entitled to receive any rights in respect of Common Stock, if any, issuable upon conversion of the Notes,
the Conversion Rate shall be adjusted at the time of separation as if the Company distributed to all or substantially all holders
of the Common Stock Distributed Property as provided in ‎Section 14.04(c), subject to readjustment in the event of the expiration,
termination or redemption of such rights.


 


Section 14.12. Exchange In Lieu Of
Conversion. (a) When a Holder surrenders its Notes for conversion, the Company may, at its election, cause the Notes
to be delivered, on or prior to the close of business on the Trading Day immediately following the relevant Conversion Date,
such Notes to a financial institution designated by the Company (the “Designated Institution”) for
exchange in lieu of conversion (an “Exchange Election”). In order to accept any Notes surrendered for
conversion for exchange in lieu of conversion, the Designated Institution must agree to timely pay or deliver, as the case
may be, in exchange for such Notes, cash, shares of Common Stock or a combination of cash and shares of Common Stock, at the
Company’s election, that would otherwise be due upon conversion as described in ‎Section 14.02 above or such
other consideration agreed to by the converting Holder and the Designated Institution (the “Conversion
Consideration”). If the Company makes the election described above, the Company shall, by the close of business on
the Trading Day following the relevant Conversion Date, notify in writing the Holder surrendering Notes for conversion, the
Trustee and the Conversion Agent (if other than the Trustee), that it has made such election, and the Company shall notify
the Designated Institution of the relevant deadline for delivery of the Conversion Consideration and the type of Conversion
Consideration to be paid and/or delivered (unless the form of Conversion Consideration has been otherwise agreed by the
Holder and the Designated Institution as set forth in this ‎Section 14.12). Any Notes exchanged by any Designated
Institution will remain outstanding, subject to applicable procedures of the Depositary.


 


The Company, the Conversion Agent and the
converting Holders shall cooperate to cause such Notes to be delivered to the Designated Institution and the Conversion Agent shall
be entitled to conclusively rely on the Company’s instruction in connection with effecting any Exchange Election and shall
not be liable for such Exchange Election outside of its control.


 


(b)           
Any Notes exchanged by the Designated Institution shall remain outstanding, notwithstanding the surrender of such Notes
and shall be subject to the procedures of the Depositary. If any Designated Institution agrees to accept any Notes for exchange
but does not timely pay and/or deliver, as the case may be, the related Conversion Consideration to the Conversion Agent, or if
such Designated Institution does not accept such Notes for exchange, the Company shall, within the time period specified in ‎Section
14.02(c), notify in writing the Trustee, the Conversion Agent and the Holders surrendering their Notes and shall pay or deliver,
as the case may be, the Conversion Consideration in accordance with the provisions of ‎Section 14.02 as if the Company had
not made the Exchange Election.


 






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(c)           
For the avoidance of doubt, in no event will the Company’s designation of a Designated Institution pursuant to this
 ‎Section 14.12 require such Designated Institution to accept any Notes for exchange. The Company may, but will not be obligated
to, enter into a separate agreement with any Designated Institution that would compensate it for any such transaction.


 


Article
15

Repurchase of Notes at Option of Holders


 


Section 15.01. Intentionally Omitted.


 


Section 15.02. Repurchase at Option
of Holders Upon a Fundamental Change. (a) If a Fundamental Change occurs at any time prior to the Maturity Date, each
Holder shall have the right, at such Holder’s option, to require the Company to repurchase for cash all of such
Holder’s Notes, or any portion of the principal amount thereof properly surrendered and not validly withdrawn pursuant
to Section 15.03 that is equal to $1,000 or a multiple of $1,000. The date of such repurchase (the “Fundamental
Change Repurchase Date”) shall be specified by the Company that is not less than 20 or more than 35 Business Days
following the date of the Fundamental Change Company Notice at a repurchase price equal to 100% of the principal amount
thereof, plus accrued and unpaid interest thereon to, but excluding, the Fundamental Change Repurchase Date (the
 “Fundamental Change Repurchase Price”), unless the Fundamental Change Repurchase Date falls after a
Regular Record Date but on or prior to the Interest Payment Date to which such Regular Record Date relates, in which case the
Company shall instead pay the full amount of accrued and unpaid interest (to, but not including Interest Payment Date) to the
Holder of record as of such Regular Record Date, and the Fundamental Change Repurchase Price shall be equal to 100% of the
principal amount of Notes to be repurchased pursuant to this ‎Article 15. Any Notes so repurchased by the Company shall
be paid for in cash. The Fundamental Change Repurchase Date shall be subject to postponement in order to allow the Company to
comply with applicable law as a result of changes to such applicable law occurring after the date of this Indenture.


 


(b)           
Repurchases of Notes under this ‎Section 15.02 shall be made, at the option of the Holder thereof, upon:


 


(i)           
delivery to the Paying Agent or the tender agent appointed by the Company to facilitate the repurchase, by a Holder of a
duly completed written notice (the “Fundamental Change Repurchase Notice”) in the form set forth in Attachment
2 to the Form of Note attached hereto as Exhibit A, if the Notes are Physical Notes, or in compliance with the Depositary’s
procedures for surrendering interests in Global Notes, if the Notes are Global Notes, in each case on or before the close of business
on the Business Day immediately preceding the Fundamental Change Repurchase Date; and


 






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(ii)           
delivery of the Notes, if the Notes are Physical Notes, to the Paying Agent or any such tender agent at any time after delivery
of the Fundamental Change Repurchase Notice (together with all necessary endorsements for transfer) at the Corporate Trust Office
of the Paying Agent, or book-entry transfer of the Notes, if the Notes are Global Notes, in compliance with the procedures of the
Depositary, in each case such delivery being a condition to receipt by the Holder of the Fundamental Change Repurchase Price therefor.


 


The Fundamental Change Repurchase Notice
in respect of any Notes to be repurchased shall state:


 


(i)           
in the case of Physical Notes, the certificate numbers of the Notes to be delivered for repurchase;


 


(ii)           
the portion of the principal amount of Notes to be repurchased, which must be $1,000 or an integral multiple thereof; and


 


(iii)           
that the Notes are to be repurchased by the Company pursuant to the applicable provisions of the Notes and this Indenture;


 


provided, however, that if the Notes are Global
Notes, the Fundamental Change Repurchase Notice must comply with appropriate Depositary procedures.


 


Notwithstanding anything herein to the contrary,
any Holder delivering to the Paying Agent or any such tender agent the Fundamental Change Repurchase Notice contemplated by this
 ‎Section 15.02 shall have the right to withdraw, in whole or in part, such Fundamental Change Repurchase Notice at any time
prior to the close of business on the Business Day immediately preceding the Fundamental Change Repurchase Date by delivery of
a written notice of withdrawal to the Paying Agent or any such tender agent in accordance with ‎Section 15.03.


 


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


 


(c)           
On or before the 20th calendar day after the occurrence of the effective date of a Fundamental Change, the Company shall
provide to all Holders, the Trustee, the Conversion Agent and any such tender agent (if other than the Trustee) and the Paying
Agent (in the case of a Paying Agent other than the Trustee) a written notice (the “Fundamental Change Company Notice”)
of the occurrence of the effective date of the Fundamental Change and of the resulting repurchase right at the option of the Holders
arising as a result thereof. In the case of Physical Notes, such notice shall be by first class mail or, in the case of Global
Notes, such notice shall be delivered in accordance with the applicable procedures of the Depositary. Each Fundamental Change Company
Notice shall specify:


 


(i)           
the events causing the Fundamental Change;


 






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(ii)           
the effective date of the Fundamental Change;


 


(iii)           
the last date on which a Holder may exercise the repurchase right pursuant to this ‎Article 15;


 


(iv)           
the Fundamental Change Repurchase Price;


 


(v)           
the Fundamental Change Repurchase Date;


 


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


 


(vii)           
if applicable, the Conversion Rate and any adjustments to the Conversion Rate as a result of such Fundamental Change (or
related Make-Whole Fundamental Change);


 


(viii)           
that the Notes with respect to which a Fundamental Change Repurchase Notice has been delivered by a Holder may be converted
only if the Holder validly withdraws the Fundamental Change Repurchase Notice in accordance with the terms of this Indenture; and


 


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


 


No failure of the Company to give the foregoing
notices and no defect therein shall limit the Holders’ repurchase rights or affect the validity of the proceedings for the
repurchase of the Notes pursuant to this ‎Section 15.02.


 


At the Company’s request, given at
least five days prior to the date the Fundamental Change Company Notice is to be sent (or such shorter period of time as may be
acceptable to the Trustee), the Paying Agent or tender agent appointed for such repurchase shall give such notice in the Company’s
name and at the Company’s expense; provided, however, that, in all cases, the text of such Fundamental Change
Company Notice shall be prepared by the Company.


 


(d)           
Notwithstanding the foregoing, no Notes may be repurchased by the Company on any date at the option of the Holders upon
a Fundamental Change if the principal amount of the Notes has been accelerated, and such acceleration has not been rescinded, on
or prior to such date (except in the case of an acceleration resulting from a Default by the Company in the payment of the Fundamental
Change Repurchase Price with respect to such Notes). The Paying Agent will promptly return to the respective Holders thereof any
Physical Notes held by it during the acceleration of the Notes (except in the case of an acceleration resulting from a Default
by the Company in the payment of the Fundamental Change Repurchase Price with respect to such Notes), or any instructions for book-entry
transfer of the Notes in compliance with the procedures of the Depositary shall be deemed to have been cancelled, and, upon such
return or cancellation, as the case may be, the Fundamental Change Repurchase Notice with respect thereto shall be deemed to have
been withdrawn.


 






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(e)           
The Company shall not be required to repurchase or make an offer to repurchase Notes upon the occurrence of a Fundamental
Change otherwise required under this ‎‎Section 15.02 if a third party makes such an offer to purchase Notes in the
same manner, at the same time and otherwise in compliance with the requirements for an offer made by the Company as set forth in
this Indenture and such third party purchases all Notes properly surrendered and not validly withdrawn under such offer to purchase
in the same manner, at the same time and otherwise in compliance with the requirements for an offer made by Company as set forth
in this Article 15.


 


Section 15.03. Withdrawal of Fundamental
Change Repurchase Notice. (a) A Fundamental Change Repurchase Notice may
be withdrawn (in whole or in part) by means of a written notice of withdrawal delivered to the Paying Agent or the tender agent
appointed to facilitate the repurchase, in accordance with this ‎Section 15.03 at any time prior to the close of business
on the Business Day immediately preceding the relevant Fundamental Change Repurchase 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 Notes in respect of which such notice of withdrawal is
being submitted, and


 


(iii)           
the principal amount, if any, of such Notes that remains subject to the original Fundamental Change Repurchase Notice;


 


provided, however, that if the Notes are Global
Notes, the notice of withdrawal must comply with appropriate procedures of the Depositary.


 


Section 15.04. Deposit of Fundamental
Change Repurchase Price. (a) The Company will deposit with the Paying Agent
appointed by the Company, or if the Company is acting as its own Paying Agent, set aside, segregate and hold in trust as provided
in ‎Section 4.04 on or prior to 11:00 a.m., New York City time, on the Fundamental Change Repurchase Date an amount of money
sufficient to repurchase all of the Notes to be repurchased at the appropriate Fundamental Change Repurchase Price. Subject to
receipt of funds and/or Notes by the Paying Agent appointed by the Company, payment for Notes surrendered for repurchase (and not
withdrawn prior to the close of business on the Business Day immediately preceding the Fundamental Change Repurchase Date) will
be made on the later of (i) the Fundamental Change Repurchase Date (provided the Holder has satisfied the conditions in
 ‎Section 15.02) and (ii) the time of book-entry transfer or the delivery of such Note to the Paying Agent appointed by the
Company by the Holder thereof in the manner required by ‎Section 15.02 by mailing checks for the amount payable to the Holders
of such Notes entitled thereto as they shall appear in the Note Register; provided, however, that payments to the
Depositary shall be made by wire transfer of immediately available funds to the account of the Depositary or its nominee. The Paying
Agent shall, promptly after such payment and upon written demand by the Company, return to the Company any funds in excess of the
Fundamental Change Repurchase Price.


 






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(b)           
If by 11:00 a.m. New York City time, on the Fundamental Change Repurchase Date, the Paying Agent appointed by the Company
holds money sufficient to pay the Fundamental Change Repurchase Price of the Notes to be repurchased on the Fundamental Change
Repurchase Date, then, with respect to the Notes that have been properly surrendered for repurchase and have not been validly withdrawn
in accordance with the provisions of this Indenture, (i) such Notes will cease
to be outstanding, (ii) interest will cease to accrue on such Notes (whether
or not book-entry transfer of the Notes has been made or the Notes have been delivered to the Paying Agent) and (iii)
all other rights of the Holders of such Notes will terminate (other than the right to receive the Fundamental Change Repurchase
Price).


 


(c)           
Upon surrender of a certificated Note that is to be repurchased in part pursuant to ‎Section 15.02, the Company shall
execute and the Trustee shall authenticate and deliver to the Holder a new certificated Note in an authorized denomination equal
in principal amount to the unrepurchased portion of the certificated Note surrendered.


 


Section 15.05. Covenant to Comply with
Applicable Laws Upon Repurchase of Notes. In connection with any repurchase offer pursuant to this ‎Article 15, the
Company will, if required:


 


(a)           
comply with the provisions of and any tender offer rules under the Exchange Act that may then be applicable;


 


(b)           
file a Schedule TO (if applicable under the Exchange Act at such time) or any other required schedule under the Exchange
Act; and


 


(c)            otherwise
comply in all material respects with all federal and state securities laws in connection with any offer by the Company to
repurchase the Notes; in each case, so as to permit the rights and obligations under this ‎Article 15 to be exercised
in the time and in the manner specified in this ‎Article 15.


 


For purposes of this Article 15, the Paying
Agent may be any agent, depositary, tender agent, paying agent or other agent appointed by the Company to accomplish the purposes
set forth herein.


 


Article
16

Optional Redemption


 


Section 16.01. Optional Redemption.
The Notes shall not be redeemable by the Company prior to June 5, 2023. On or after June 5, 2023, and prior to the 41st Scheduled
Trading Day immediately preceding the Maturity Date, the Company may redeem (an “Optional Redemption”) for cash
all or any portion of the Notes, at the Redemption Price, if the Last Reported Sale Price of the Common Stock has been at least
130% of the Conversion Price then in effect for at least 20 Trading Days (whether or not consecutive), including at least one of
the three Trading Days immediately preceding the date on which the Company provides Notice of Redemption during any 30 consecutive
Trading Day period ending on, and including, the Trading Day immediately preceding the date on which the Company provides the Redemption
Notice in accordance with ‎Section 16.02.


 






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Section 16.02. Notice of Optional
Redemption; Selection of Notes. (a) In case the Company exercises its Optional Redemption right to redeem all or, as the
case may be, any part of the Notes pursuant to ‎Section 16.01, it shall fix a date for redemption (each, a
 “Redemption Date”) and it or, at its written request received by the Trustee not less than 5 Business Days
prior to the date such Redemption Notice is to be sent (or such shorter period of time as may be acceptable to the Trustee),
the Trustee, in the name of and at the expense of the Company, shall deliver or cause to be delivered a written notice of
such Optional Redemption (a “Redemption Notice”) not less than 45 nor more than 60 Scheduled Trading Days
prior to the Redemption Date (provided that if the Company elects Physical Settlement for conversions that occur
during the related Redemption Period, the Company may provide not less than 15 nor more than 45 calendar days’ written
notice) to the Trustee, the Conversion Agent (if other than the Trustee), the Paying Agent, and each Holder of Notes so to be
redeemed as a whole or in part; provided that, if the Company shall give such notice, it shall also give written
notice of the Redemption Date to the Trustee. The Redemption Date must be a Business Day.


 


(b)           
The Redemption Notice, if delivered in the manner herein provided, shall be conclusively presumed to have been duly given,
whether or not the Holder receives such notice. In any case, failure to give such Redemption Notice or any defect in the Redemption
Notice to the Holder of any Note designated for redemption as a whole or in part shall not affect the validity of the proceedings
for the redemption of any other Note.


 


(c)           
Each Redemption Notice shall specify:


 


(i)           
the Redemption Date;


 


(ii)           
the Redemption Price;


 


(iii)           
that on the Redemption Date, the Redemption Price will become due and payable upon each Note to be redeemed, and that interest
thereon, if any, shall cease to accrue on and after the Redemption Date;


 


(iv)           
the place or places where such Notes are to be surrendered for payment of the Redemption Price;


 


(v)           
that Holders may surrender their Notes for conversion at any time prior to the close of business on the second Scheduled
Trading Day immediately preceding the Redemption Date;


 


(vi)           
the procedures a converting Holder must follow to convert its Notes and the Settlement Method;


 






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(vii)          
the Conversion Rate and, if applicable, the number of Additional Shares added to the Conversion Rate in accordance with
 ‎Section 14.03;


 


(viii)         
the Settlement Method in respect of Notes converted during the Redemption Period and, if applicable, the Specified Dollar
Amount;


 


(ix)           
the CUSIP, ISIN or other similar numbers, if any, assigned to such Notes; and


 


(x)             in
case any Note is to be redeemed in part only, the portion of the principal amount thereof to be redeemed and on and after the
Redemption Date, upon surrender of such a certificated Note, a new certificated Note in principal amount equal to the
unredeemed portion thereof shall be issued, which principal amount must be $1,000 or a multiple thereof.


 


A Redemption Notice shall be irrevocable.


 


(d)           
If fewer than all of the outstanding Notes are to be redeemed, the Notes to be redeemed will be selected according to the
Depositary’s applicable procedures, in the case of Notes represented by a Global Note, or, in the case of Notes represented
by Physical Notes, the Trustee shall select, in such manner as it shall deem appropriate and fair, Notes to be redeemed in whole
or in part. If any Note selected for partial redemption is submitted for conversion in part after such selection, the portion of
the Note submitted for conversion shall be deemed (so far as may be possible) to be the portion selected for redemption, subject,
in the case of Notes represented by a Global Note, to the Depositary’s applicable procedures.


 


Section 16.03. Payment of Notes Called
for Redemption. (a) If any Redemption Notice has been given in respect
of the Notes in accordance with ‎Section 16.02, the Notes shall become due and payable on the Redemption Date at the place
or places stated in the Redemption Notice and at the applicable Redemption Price. On presentation and surrender of the Notes at
the place or places stated in the Redemption Notice, the Notes shall be paid and redeemed by the Company at the applicable Redemption
Price.


 


(b)           
Prior to 11:00 a.m. New York City time on the Redemption Date, the Company shall deposit with the Paying Agent or, if the
Company or a Subsidiary of the Company is acting as the Paying Agent, shall segregate and hold in trust as provided in ‎Section
7.05 an amount of cash (in immediately available funds if deposited on the Redemption Date), sufficient to pay the Redemption Price
of all of the Notes to be redeemed on such Redemption Date. Subject to receipt of funds by the Paying Agent, payment for the Notes
to be redeemed shall be made on the Redemption Date for such Notes. The Paying Agent shall, promptly after such payment and upon
written demand by the Company, return to the Company any funds in excess of the Redemption Price.


 


Section 16.04. Restrictions on Redemption.
The Company may not redeem any Notes on any date if the principal amount of the Notes has been accelerated in accordance with the
terms of this Indenture, 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 the Company in the payment of the Redemption Price with respect to such Notes).


 






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Article
17

Miscellaneous Provisions


 


Section 17.01. 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 17.02. 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 sole successor of the Company.


 


Section 17.03. Addresses for Notices,
Etc. Any notice that by any provision of this Indenture is required or permitted to be given by the Trustee or by the Holders
to the Company shall be deemed to have been sufficiently given or made, for all purposes if given by being deposited postage prepaid
by registered or certified mail via overnight courier or sent electronically in PDF format addressed to Plug Power Inc., 968 Albany
Shaker Road, Latham, New York 12110, Attention: Chief Financial Officer, with a copy to Goodwin Procter LLP, 100 Northern Avenue,
Boston, MA 02210, Attention: James Barri and Tim Nguyen. Any notice, direction, request, document or demand hereunder to or upon
the Trustee shall be deemed to have been sufficiently given or made or filed with, for all purposes, if it is in writing and actually
received by the Trustee (including electronically in PDF format). In no event shall the Trustee or Conversion Agent be obligated
to monitor any website maintained by the Company or any press releases issued by the Company.


 


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


 


Any notice or communication delivered or
to be delivered to a Holder of Physical Notes 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. Any notice or communication
delivered or to be delivered to a Holder of Global Notes shall be delivered in accordance with the applicable procedures of the
Depositary and shall be sufficiently given to it if so delivered within the time prescribed.


 


Failure to mail or deliver a notice or communication
to a Holder or any defect in it shall not affect its sufficiency with respect to other Holders. If a notice or communication is
mailed or delivered, as the case may be, 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 shall constitute a sufficient notification for every
purpose hereunder.


 


Section 17.04. Governing Law; Jurisdiction.
THIS INDENTURE AND EACH NOTE, AND ANY CLAIM, CONTROVERSY OR DISPUTE ARISING UNDER OR RELATED TO THIS INDENTURE AND EACH NOTE, SHALL
BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.


 


The Company irrevocably consents and agrees,
for the benefit of the Holders from time to time of the Notes and the Trustee, that any legal action, suit or proceeding against
it with respect to obligations, liabilities or any other matter arising out of or in connection with this Indenture or the Notes
may be brought in the courts of the State of New York or the courts of the United States located in the Borough of Manhattan, New
York City, New York and, until amounts due and to become due in respect of the Notes have been paid, hereby irrevocably consents
and submits to the non-exclusive jurisdiction of each such court in personam, generally and unconditionally with respect
to any action, suit or proceeding for itself in respect of its properties, assets and revenues.


 


The Company irrevocably and unconditionally
waives, to the fullest extent permitted by law, any objection which it may now or hereafter have to the laying of venue of any
of the aforesaid actions, suits or proceedings arising out of or in connection with this Indenture brought in the courts of the
State of New York or the courts of the United States located in the Borough of Manhattan, New York City, New York and hereby further
irrevocably and unconditionally waives and agrees not to plead or claim in any such court that any such action, suit or proceeding
brought in any such court has been brought in an inconvenient forum.


 


Section 17.05. Evidence of Compliance
with Conditions Precedent; Certificates and Opinions of Counsel to Trustee. Upon any application or demand by the Company to
the Trustee to take any action under any of the provisions of this Indenture, the Company shall furnish to the Trustee an Officer’s
Certificate and, if requested by the Trustee, an Opinion of Counsel stating that such action is permitted by the terms of this
Indenture and that all conditions precedent to such action have been compiled with; provided that no Opinion of Counsel
shall be required to be delivered in connection with the removal of the restricted CUSIP of the Restricted Securities to an unrestricted
CUSIP pursuant to the applicable procedures of the Depositary upon the Notes becoming freely tradable by non-Affiliates of the
Company under Rule 144, unless either a new Note is to be issued and authenticated (in which case the Opinion of Counsel required
by Section 2.04 shall be delivered) or the Note is deemed to be represented by the unrestricted CUSIP pursuant to the procedures
set forth in footnote 1 of the Note (in which case an Opinion of Counsel with respect to those procedures shall be delivered);
provided further that no Opinion of Counsel shall be required to be delivered in connection with a request by the Company
that the Trustee deliver a notice to Holders under this Indenture where the Trustee receives an Officer’s Certificate with
respect to such notice. With respect to matters of fact, an Opinion of Counsel may rely on an Officer’s Certificate or certificates
of public officials.


 






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Each Officer’s Certificate and Opinion
of Counsel provided for, by or on behalf of the Company in this Indenture and delivered to the Trustee with respect to compliance
with this Indenture (other than the Officer’s Certificates provided for in ‎Section 4.08) shall include (a)
a statement that the person signing such certificate is familiar with the requested action and this Indenture; (b)
a brief statement as to the nature and scope of the examination or investigation upon which the statement contained in such certificate
is based; (c) a statement that, in the judgment of such person, he or she has
made such examination or investigation as is necessary to enable him or her to express an informed judgment as to whether or not
such action is permitted by this Indenture and whether all conditions precedent to such action have been complied with; and (d)
a statement as to whether or not, in the judgment of such person, such action is permitted by this Indenture and that all conditions
precedent thereto have been complied with.


 


Notwithstanding anything to the contrary
in this ‎Section 17.05, if any provision in this Indenture specifically provides that the Trustee shall or may receive an
Opinion of Counsel in connection with any action to be taken by the Trustee or the Company hereunder, the Trustee shall be entitled
to such Opinion of Counsel.


 


Section 17.06. Legal Holidays. In
any case where any Interest Payment Date, Fundamental Change Repurchase Date or Maturity Date is not a Business Day, then any action
to be taken on such date need not be taken on such date, but may be taken on the next succeeding Business Day with the same force
and effect as if made on the relevant scheduled payment date, and no interest shall accrue in respect of the delay.


 


Section 17.07. 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 17.08. Benefits of Indenture.
Nothing in this Indenture or in the Notes, expressed or implied, shall give to any Person, other than the Holders, the parties
hereto, any Paying Agent, any Conversion Agent, any authenticating agent, any Note Registrar and their successors hereunder, any
benefit or any legal or equitable right, remedy or claim under this Indenture.


 


Section 17.09. 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 17.10. Authenticating Agent.
The Trustee may appoint an 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 2.04, ‎Section 2.05, ‎Section 2.06, ‎Section 2.07, ‎Section 10.04 and ‎Section
15.04 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 Trustee” and a
certificate of authentication executed on behalf of the Trustee by an authenticating agent shall be deemed to satisfy any requirement
hereunder or in the Notes for the Trustee’s certificate of authentication. Such authenticating agent shall at all times be
a Person eligible to serve as trustee hereunder pursuant to ‎Section 7.08.


 






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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 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 17.10, 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.


 


Any authenticating agent may at any time
resign by giving written notice of resignation to the Trustee and to the Company. The Trustee 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 Trustee may appoint a successor authenticating agent (which may be the Trustee), shall give written notice
of such appointment to the Company.


 


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 7.02, ‎Section
7.03, ‎Section 7.04, ‎Section 8.03 and this ‎Section 17.10 shall be applicable to any authenticating agent.


 


If an authenticating agent is appointed
pursuant to this ‎Section 17.10, the Notes may have endorsed thereon, in addition to the Trustee’s certificate of authentication,
an alternative certificate of authentication in the following form:


 


 


	 	,	 
	as Authenticating Agent, certifies that this is one of the Notes described

in the within-named Indenture.	 
	 	 
	By: 	               	 	 
	Authorized Signatory	 




 






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Section 17.11. 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 or other electronic transmission shall constitute effective execution and delivery of this Indenture as to the parties
hereto and may be used in lieu of the original 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 17.12. Severability; Entire Agreement.
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. This
Indenture and the exhibits hereto set forth the entire agreement and understanding of the parties related to the transactions contemplated
hereby and supersedes all prior agreements and understandings, written and oral.


 


Section 17.13. 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 TRANSACTIONS CONTEMPLATED
HEREBY.


 


Section 17.14. Force Majeure. In
no event shall the Trustee 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, pandemics,
epidemics, and interruptions, loss or malfunctions of utilities, communications or computer (software and hardware) services or
the unavailability of the Federal Reserve Bank wire or telex or other wire or communication facility; it being understood that
the Trustee 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 17.15. Calculations.
The Company shall be responsible for making all calculations called for under the Notes. These calculations include, but are
not limited to, determinations of the Stock Price, the Last Reported Sale Prices of the Common Stock, the Daily VWAPs, the
Daily Conversion Values, the Daily Settlement Amounts, accrued interest payable on the Notes (including, for the avoidance of
doubt, any Additional Interest payable under this Indenture), the Conversion Rate and the Conversion Price of the Notes. 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. The Company shall provide a schedule of its calculations to each of the Trustee and the
Conversion Agent, and each of the Trustee and Conversion Agent is entitled to rely conclusively upon the accuracy of the
Company’s calculations without independent verification. The Trustee will forward the Company’s calculations to
any Holder upon the written request of that Holder at the sole cost and expense of the Company.


 


Section 17.16. 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.


 






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Section 17.17. Tax Withholding. The
Company or the Trustee, as the case may be, shall be entitled to make a deduction or withholding from any payment which it makes
under this Indenture for or on account of any present or future taxes, duties or charges if and to the extent so required by any
applicable law and any current or future regulations or agreements thereunder or official interpretations thereof or any law implementing
an intergovernmental approach thereto or by virtue of the relevant Holder failing to satisfy any certification or other requirements
in respect of the Notes, in which event the Company or the Trustee, as the case may be, shall make such payment after such withholding
or deduction has been made and shall account to the relevant authorities for the amount so withheld or deducted and shall have
no obligation to gross up any payment hereunder or pay any additional amount as a result of such withholding tax.


 


Section 17.18 Electronic Signatures.
The words “execution,” “signed,” “signature,” and words of similar import in this Indenture
and the Note shall be deemed to include electronic or digital signatures or the keeping of records in electronic form, each of
which shall be of the same effect, validity, and enforceability as manually executed signatures or a paper-based recordkeeping
system, as the case may be, to the extent and as provided for under applicable law, including the Electronic Signatures in Global
and National Commerce Act of 2000 (15 U.S.C. §§ 7001-7006), the Electronic Signatures and Records Act of 1999 (N.Y. State
Tech. §§ 301-309), or any other similar state laws based on the Uniform Electronic Transactions Act; provided
that, notwithstanding anything herein to the contrary, the Trustee is not under any obligation to agree to accept electronic signatures
in any form or in any format unless expressly agreed to by the Trustee pursuant to procedures approved by the Trustee.


 





[Remainder
of page intentionally left blank]


 



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


 


		PLUG POWER INC.
	 	 	 
		By:	/s/ Paul B. Middleton
	 	 	Name: Paul B. Middleton
	 	 	Title: Chief Financial Officer




 


[Signature Page to Indenture]


 



    


     


    




 


	 	WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee
	 	 
	 	By:	/s/ Quinton M. DePompolo
	 	 	Name:	Quinton M. DePompolo
	 	 	Title:	Banking Officer



 


[Signature Page to Indenture]


 



    


     


    




 


EXHIBIT A


 


[FORM OF FACE OF NOTE]


 


[INCLUDE FOLLOWING LEGEND
IF A GLOBAL NOTE]


 


[UNLESS THIS CERTIFICATE
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 CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF
CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT HEREUNDER 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.]


 


[INCLUDE FOLLOWING LEGEND
IF A RESTRICTED SECURITY]


 


[THIS SECURITY AND
THE COMMON STOCK, IF ANY, ISSUABLE UPON CONVERSION OF THIS SECURITY 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 EXCEPT IN ACCORDANCE
WITH THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF OR OF A BENEFICIAL INTEREST HEREIN, THE ACQUIRER:


 


(1) REPRESENTS
THAT IT AND ANY ACCOUNT FOR WHICH IT IS ACTING IS A “QUALIFIED INSTITUTIONAL BUYER” (WITHIN THE MEANING OF RULE 144A
UNDER THE SECURITIES ACT) AND THAT IT EXERCISES SOLE INVESTMENT DISCRETION WITH RESPECT TO EACH SUCH ACCOUNT, AND


 


(2) AGREES
FOR THE BENEFIT OF PLUG POWER INC. (THE “COMPANY”) THAT IT WILL NOT OFFER, SELL, PLEDGE OR OTHERWISE TRANSFER THIS
SECURITY OR ANY BENEFICIAL INTEREST HEREIN PRIOR TO THE DATE THAT IS THE LATER OF (X) ONE YEAR AFTER THE LAST ORIGINAL ISSUE DATE
HEREOF OR SUCH SHORTER PERIOD OF TIME AS PERMITTED BY RULE 144 UNDER THE SECURITIES ACT OR ANY SUCCESSOR PROVISION THERETO AND
(Y) SUCH LATER DATE, IF ANY, AS MAY BE REQUIRED BY APPLICABLE LAW, EXCEPT:


 


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


 






    A-1


     


    




 





(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 (2)(D) ABOVE, THE COMPANY AND THE TRUSTEE RESERVE THE RIGHT TO REQUIRE THE DELIVERY OF
SUCH LEGAL OPINIONS, CERTIFICATIONS OR OTHER EVIDENCE AS MAY REASONABLY BE REQUIRED IN ORDER FOR THE COMPANY 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.]1


 





 






1 The Restrictive
Legend set forth on this page [Insert if a Global Note: (other than the first paragraph hereof)] shall be deemed removed from
the face of this Note, without further action of the Company, the Trustee or the Holder(s) of this Note, at such time when the
Company delivers written notice to the Trustee of such deemed removal pursuant to Section 2.05(c) of the within-mentioned Indenture.


 







    A-2


     


    

 





Plug Power Inc.

3.75% Convertible Senior Note due 2025


 


No. [__]Initially $200,000,000


 


CUSIP No. [_____]2


 


Plug Power Inc., a corporation duly organized
and validly existing under the laws of the State of Delaware (the “Company,” which term includes any successor
corporation or other entity under the Indenture referred to on the reverse hereof), for value received hereby promises to pay to
CEDE & CO., or registered assigns, the principal sum as set forth in the “Schedule of Exchanges of Notes” attached
hereto, which amount, taken together with the principal amounts of all other outstanding Notes, shall not, unless permitted by
the Indenture, exceed $200,000,000 (as increased by an amount equal to the aggregate principal amount of any additional Notes purchased
by the Initial Purchasers pursuant to the exercise of their option to purchase additional Notes as set forth in the Purchase Agreement),
in aggregate at any time, in accordance with the rules and procedures of the Depositary, on June 1, 2025, and interest thereon
as set forth below.


 


This Note shall bear interest at the rate
of 3.75% per year from and including May 18 2020, or from and including the most recent date to which interest has been paid or
provided for to, but excluding, the next scheduled Interest Payment Date until June 1, 2025. Accrued interest on this Note shall
be computed on the basis of a 360-day year composed of twelve 30-day months and, for partial months, on the basis of the number
of days actually elapsed in a 30-day month. Interest is payable semi-annually in arrears on each June 1 and December 1, commencing
on December 1, 2020, to Holders of record at the close of business on the preceding May 15 and November 15 (whether or not such
day is a Business Day), respectively. Additional Interest will be payable as set forth in ‎Section 4.06(d), ‎Section
4.06(e) and ‎Section 6.03 of the within-mentioned Indenture, and any reference to interest on, or in respect of, any Note
therein shall be deemed to include Additional Interest if, in such context, Additional Interest is, was or would be payable pursuant
to any of such ‎Section 4.06(d), ‎Section 4.06(e) or ‎Section 6.03, and any express mention of the payment of
Additional Interest in any provision therein shall not be construed as excluding Additional Interest in those provisions thereof
where such express mention is not made.


 


Any Defaulted Amounts shall accrue interest
per annum at the rate borne by the Notes, from, and including, the relevant payment date to, but excluding, the date on which such
Defaulted Amounts shall have been paid by the Company, at its election, in accordance with ‎Section 2.03(c) of the Indenture.





 


 






2 At such time as the Company
notifies the Trustee of the deemed removal of the legend set forth on the immediately preceding page [Insert if a Global Note:
(other than the first paragraph thereof)] pursuant to Section 2.05(c) of the within- mentioned Indenture, the CUSIP number for
this Note shall be deemed to be CUSIP No. [____].


 






    A-3


     


    

 





The Company shall pay the principal of and
interest on this Note, if and so long as such Note is a Global Note, in immediately available funds in lawful money of the United
States at the time to the Depositary or its nominee, as the case may be, as the registered Holder of such Note. As provided in
and subject to the provisions of the Indenture, the Company shall pay the 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 the Corporate Trust Office in the contiguous United States of America,
as a place where Notes may be presented for payment or for registration of transfer and exchange.


 


Reference is made to the further provisions
of this Note set forth on the reverse hereof, including, without limitation, provisions giving the Holder of this Note the right
to convert this Note into cash, shares of Common Stock or a combination of cash and shares of Common Stock, as applicable, on the
terms and subject to the limitations set forth in the Indenture. Such further provisions shall for all purposes have the same effect
as though fully set forth at this place.


 


This Note, and any claim, controversy
or dispute arising under or related to this Note, shall be construed in accordance with and governed by the laws of the State of
New York.


 


In the case of any conflict between this
Note and the Indenture, the provisions of the Indenture shall control and govern.


 


This Note shall not be valid or become obligatory
for any purpose until the certificate of authentication hereon shall have been signed manually by the Trustee or a duly authorized
authenticating agent under the Indenture.


 


[Remainder of page intentionally left
blank]


 






    A-4


     


    

 


IN WITNESS WHEREOF, the Company has caused
this Note to be duly executed.


 


	 	PLUG POWER INC.
	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:



 





Dated:


 


TRUSTEE’S CERTIFICATE OF AUTHENTICATION



WILMINGTON TRUST, NATIONAL ASSOCIATION

as Trustee, certifies that this is one of the Notes described

in the within-named Indenture.


 


	By:	 	 
	 	Authorized Signatory	 




 






    


     


    




 


[FORM OF REVERSE OF NOTE]


 


Plug Power Inc.

3.75% Convertible Senior Note due 2025


 


This Note is one of a duly authorized issue
of Notes of the Company, designated as its 3.75% Convertible Senior Notes due 2025 (the “Notes”), initially
limited to the aggregate principal amount of $200,000,000 (as increased by an amount equal to the aggregate principal amount of
any additional Notes purchased by the Initial Purchasers pursuant to the exercise of their option to purchase additional Notes
as set forth in the Purchase Agreement) all issued or to be issued under and pursuant to an Indenture dated as of May 18, 2020
(the “Indenture”), between the Company and Wilmington Trust, National Association, as trustee (the “Trustee”),
to which Indenture and all indentures supplemental thereto reference is hereby made for a description of the rights, limitations
of rights, obligations, duties and immunities thereunder of the Trustee, the Company and the Holders of the Notes. Additional Notes
may be issued in an unlimited aggregate principal amount, subject to certain conditions specified in the Indenture. Capitalized
terms used in this Note and not defined in this Note shall have the respective meanings set forth in the Indenture.


 


In case certain Events of Default, as defined
in the Indenture, shall have occurred and be continuing, the principal of, and interest on, all Notes may be declared, by either
the Trustee or Holders of at least 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 and certain exceptions set forth in the Indenture.


 


Subject to the terms and conditions of the
Indenture, the Company will make all payments and deliveries in respect of the Fundamental Change Repurchase Price on the Fundamental
Change Repurchase Date and the principal amount on the Maturity Date, as the case may be, to the Holder who surrenders a Note to
a 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 contains provisions permitting
the Company and the Trustee in certain circumstances, without the consent of the Holders of the Notes, and in certain other circumstances,
with the consent of the Holders of not less than a majority in aggregate principal amount of the Notes at the time outstanding,
evidenced as in the Indenture provided, to execute supplemental indentures modifying the terms of the Indenture and the Notes as
described therein. It is also provided in the Indenture that, subject to certain exceptions, the Holders of a majority in aggregate
principal amount of the Notes at the time outstanding may on behalf of the Holders of all of the Notes waive any past Default or
Event of Default under the Indenture and its consequences.


 


Notwithstanding any other provision of
the Indenture or any provision of this Note, each Holder shall have the contractual right to receive payment or delivery, as
the case may be, of (x) the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if
applicable) of, (y) accrued and unpaid interest, if any, on, and (z) the consideration due upon conversion of, this Note, on
or after the respective due dates expressed or provided for in this Note or in the Indenture, and the contractual right to
institute suit for the enforcement of any such payment or delivery, as the case may be, on or after such respective dates,
shall not be amended without the consent of each Holder.


 






    R-1


     


    

 


The Notes are issuable in registered form
without coupons in minimum denominations of $1,000 principal amount and integral multiples in excess thereof. At the office or
agency of the Company referred to on the face hereof, and in the manner and subject to the limitations provided in the Indenture,
Notes may be exchanged for a like aggregate principal amount of Notes of other authorized denominations, without payment of any
service charge but, if required by the Company or Trustee, with payment of a sum sufficient to cover any transfer or similar tax
that may be imposed in connection therewith as a result of the name of the Holder of the new Notes issued upon such exchange of
Notes being different from the name of the Holder of the old Notes surrendered for such exchange.


 


The Notes shall be redeemable at the Company’s
option on or after June 5, 2023, in accordance with the terms and subject to the conditions specified in the Indenture. No sinking
fund is provided for the Notes.


 


Upon the occurrence of a Fundamental Change,
the Holder has the right, at such Holder’s option, to require the Company to repurchase for cash all of such Holder’s
Notes or any portion thereof (in principal amounts of $1,000 or multiples thereof) on the Fundamental Change Repurchase Date at
a price equal to the Fundamental Change Repurchase Price.


 


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 the Maturity Date, to
convert any Notes or portion thereof that is $1,000 or a multiple thereof, into cash, shares of Common Stock or a combination of
cash and shares of Common Stock, as applicable, at the Conversion Rate specified in the Indenture, as adjusted from time to time
as provided in the Indenture.


 


Terms used in this Note and defined in the
Indenture are used herein as therein defined.


 






    R-2


     


    

 


ABBREVIATIONS


 


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


 


TEN COM = as tenants in common


 


UNIF GIFT MIN ACT = Uniform Gifts to Minors Act


 


CUST = Custodian


 


TEN ENT = as tenants by the entireties




JT TEN = joint tenants with right of survivorship and not as tenants in common


 





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


 



    R-3


     


    




 


 


SCHEDULE A


 


SCHEDULE OF EXCHANGES OF NOTES



Plug Power Inc.

3.75% Convertible Senior Notes due 2025


 


The initial principal amount of this Global
Note is TWO HUNDRED MILLION DOLLARS ($200,000,000). The following increases or decreases in this Global Note have been made:


 


	Date of exchange
	 	Amount of 
 decrease in
 principal amount 
 of this Global Note	 	Amount of 
 increase in
 principal amount 
 of this Global Note	 	Principal amount 
 of this Global Note
 following such 
 decrease or increase	 	Signature of 
 authorized 
 signatory of 
 Trustee or 
 Custodian
	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	 	 	 




 



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ATTACHMENT 1


 


[FORM OF NOTICE OF CONVERSION]


 


To: Plug Power Inc.


 


To: Wilmington Trust, National Association

50 South Sixth Street, Suite 1290


Minneapolis, MN 55402


Attn: Plug Power Inc. Account Manager


 


The undersigned registered owner of this
Note hereby exercises the option to convert this Note, or the portion hereof (that is $1,000 principal amount or a multiple thereof)
below designated, into cash, shares of Common Stock or a combination of cash and shares of Common Stock, as applicable, 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 such conversion, together with any cash for any fractional share, and any Notes representing any unconverted
principal amount hereof, be issued and delivered to the registered Holder hereof unless a different name has been indicated below.
If any shares of Common Stock or any portion of this Note not converted are to be issued in the name of a Person other than the
undersigned, the undersigned will pay all documentary, stamp or similar issue or transfer taxes, if any in accordance with ‎Section
14.02(d) and ‎Section 14.02(e) of the Indenture. Any amount required to be paid to the undersigned on account of interest
accompanies this Note. Capitalized terms used herein but not defined shall have the meanings ascribed to such terms in the Indenture.


 


	Dated:	 	 	 
	 	 	 	 
	 	 	 	 
	
	 	 	 	Signature(s)
	



 


	 	 
	Signature Guarantee	 
	 	 
	Signature(s) must be guaranteed by an eligible Guarantor
                                                         Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an
                                                         approved signature guarantee medallion program pursuant to Securities and Exchange Commission Rule 17Ad-15 if
                                                         shares	 







 






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	of Common Stock are to be issued, or Notes
    are to be delivered, other than to and in the name of the registered holder.	 
	 	 
	Fill in for registration of shares if to
    be issued, and Notes if to be delivered, other than to and in the name of the registered holder:	 
	 	 
	 	 
	(Name)	 
	 	 
	 	 
	(Street Address)	 
	 	 
	 	 
	(City, State and Zip Code)	 
	Please print name and address	 
	 	 
	 	Principal amount to be converted (if less than all): $______,000
	 	 
	 	NOTICE: The above signature(s) of the Holder(s) hereof must correspond with the name as
    written upon the face of the Note in every particular without alteration or enlargement or any change whatever.
	 	 
	 	 
	 	Social Security or Other Taxpayer

    Identification Number




 









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ATTACHMENT 2


 


[FORM OF FUNDAMENTAL CHANGE REPURCHASE NOTICE]


 


To: Plug Power Inc.


 




To: Paying Agent/Tender Agent


 


The undersigned registered owner of this
Note hereby acknowledges receipt of a notice from Plug Power Inc. (the “Company”) as to the occurrence of a
Fundamental Change with respect to the Company and specifying the Fundamental Change Repurchase Date and requests and instructs
the Company to pay to the registered holder hereof in accordance with ‎Section 15.02 of 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 a multiple thereof)
below designated, and (2) if such Fundamental Change Repurchase 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, if any, thereon to, but excluding, such
Fundamental Change Repurchase Date. Capitalized terms used herein but not defined shall have the meanings ascribed to such terms
in the Indenture.


 


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


 





	Dated:	 	 	 
	 	 	 	 
	 	 	 	 
	
	 	 	 	Signature(s)
	


 


	 	 
	 	Social Security or Other Taxpayer

    Identification Number
	 	 
	 	Principal amount to be repurchased (if less than all): $______,000
	 	 
	 	NOTICE: The above signature(s) of the Holder(s) hereof must correspond with the name as
    written upon the face of the Note in every particular without alteration or enlargement or any change whatever.






 






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ATTACHMENT 3


 


[FORM OF ASSIGNMENT AND TRANSFER]


 


Wilmington Trust, National Association

50 South Sixth Street, Suite 1290


Minneapolis, MN 55402


Attn: Plug Power Inc. Account Manager


 


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 _____________________ attorney to transfer the said Note on the
books of the Company, with full power of substitution in the premises.


 


In connection with any transfer of the within Note occurring
prior to the Resale Restriction Termination Date, as defined in the Indenture governing such Note, the undersigned confirms that
such Note is being transferred:


 


 ̈         To Plug Power Inc. or a subsidiary thereof; or


 


 ̈         Pursuant to a registration statement that has become
or been declared effective under the Securities Act of 1933, as amended; or


 


 ̈         Pursuant to and in compliance with Rule 144A under
the Securities Act of 1933, as amended; or


 


 ̈         Pursuant to and in compliance with Rule 144 under
the Securities Act of 1933, as amended, or any other available exemption from the registration requirements of the Securities Act
of 1933, as amended.


 






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	Dated:	 	 
	 	 	 
	 	 
	Signature(s)	 
	 	 
	 	 
	Signature Guarantee	 



 


Signature(s) must be guaranteed by an

eligible Guarantor Institution (banks, stock

brokers, savings and loan associations and

credit unions) with membership in an approved

signature guarantee medallion program pursuant

to Securities and Exchange Commission

Rule 17Ad-15 if Notes are to be delivered, other

than to and in the name of the registered holder.


 


NOTICE: The signature on the assignment must correspond with
the name as written upon the face of the Note in every particular without alteration or enlargement or any change whatever.


 



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