Document:

Indenture

 Exhibit 4.1 
  

 DIVERSA CORPORATION

 and 
 WELLS FARGO BANK,
NATIONAL ASSOCIATION 
 as Trustee 
  

 INDENTURE 
 Dated as of March 28, 2007 
  

 $100,000,000 Principal Amount 
 5.50% CONVERTIBLE SENIOR NOTES
DUE 2027 

  

 CROSS-REFERENCE TABLE 
  

			
	 TIA
 Section
	  	 Indenture
 Section

	 310(a)(1)
	  	7.10
	 (a)(2)
	  	7.10
	 (a)(3)
	  	N.A.
	 (a)(4)
	  	N.A.
	 (a)(5)
	  	N.A.
	 (b)
	  	7.08; 7.10; 11.02
	 (c)
	  	N.A.
	 311(a)
	  	7.11
	 (b)
	  	7.11
	 (c)
	  	N.A.
	 312(a)
	  	2.05
	 (b)
	  	11.03
	 (c)
	  	11.03
	 313(a)
	  	7.06
	 (b)(1)
	  	N.A.
	 (b)(2)
	  	7.06
	 (c)
	  	7.06; 11.02
	 (d)
	  	7.06
	 314(a)
	  	4.03
	 (b)
	  	N.A.
	 (c)(1)
	  	11.04
	 (c)(2)
	  	11.04
	 (c)(3)
	  	N.A.
	 (d)
	  	N.A.
	 (e)
	  	11.05
	 (f)
	  	N.A.
	 315(a)
	  	7.01(B)
	 (b)
	  	7.05; 11.02
	 (c)
	  	7.01(A)
	 (d)
	  	7.01(C)
	 (e)
	  	6.11
	 316(a) (last sentence)
	  	2.09
	 (a)(1)(A)
	  	6.05
	 (a)(1)(B)
	  	6.04
	 (a)(2)
	  	N.A.
	 (b)
	  	6.07
	 (c)
	  	N.A.
	 317(a)(1)
	  	6.08
	 (a)(2)
	  	6.09
	 (b)
	  	2.04
	 318(a)
	  	11.01

  

 I 

 TABLE OF CONTENTS 
  

					
	 	  	Page
		  	 I. DEFINITIONS AND INCORPORATION BY REFERENCE
	  	
			
	1.01	  	Definitions.	  	1
	1.02	  	Other Definitions.	  	5
	1.03	  	Incorporation by Reference of Trust Indenture Act.	  	7
	1.04	  	Rules of Construction.	  	7
			
		  	 II. THE SECURITIES
	  	
			
	2.01	  	Form and Dating.	  	8
	2.02	  	Execution and Authentication.	  	8
	2.03	  	Registrar, Paying Agent and Conversion Agent.	  	9
	2.04	  	Paying Agent to Hold Money in Trust.	  	10
	2.05	  	Securityholder Lists.	  	10
	2.06	  	Transfer and Exchange.	  	10
	2.07	  	Replacement Securities.	  	11
	2.08	  	Outstanding Securities.	  	11
	2.09	  	Securities Held by the Company or an Affiliate.	  	12
	2.10	  	Temporary Securities.	  	12
	2.11	  	Cancellation.	  	12
	2.12	  	Defaulted Interest.	  	13
	2.13	  	CUSIP Numbers.	  	13
	2.14	  	Deposit of Moneys.	  	13
	2.15	  	Book-Entry Provisions for Global Securities.	  	13
	2.16	  	Special Transfer Provisions.	  	14
	2.17	  	Restrictive Legends.	  	15
	2.18	  	Ranking.	  	16
	2.19	  	Additional Securities.	  	16
			
		  	 III. REDEMPTION AND REPURCHASE
	  	
			
	3.01	  	Right of Redemption.	  	16
	3.02	  	Notices to Trustee.	  	17
	3.03	  	Selection of Securities to Be Redeemed.	  	17
	3.04	  	Notice of Redemption.	  	18
	3.05	  	Effect of Notice of Redemption.	  	19
	3.06	  	Deposit of Redemption Price.	  	19
	3.07	  	Securities Redeemed in Part.	  	20
	3.08	  	Purchase of Securities at Option of the Holder.	  	20
	3.09	  	Repurchase at Option of Holder Upon a Fundamental Change.	  	24

  

 -i- 

					
			
		  	 IV. COVENANTS
	  	
			
	4.01	  	Payment of Securities.	  	30
	4.02	  	Maintenance of Office or Agency.	  	31
	4.03	  	Rule 144A Information and Annual Reports.	  	31
	4.04	  	Compliance Certificate.	  	32
	4.05	  	 Stay, Extension and Usury Laws.
	  	32
	4.06	  	Corporate Existence.	  	33
	4.07	  	Notice of Default.	  	33
	4.08	  	Further Instruments and Acts.	  	33
	4.09	  	Additional Interest Notice.	  	33
			
		  	 V. SUCCESSORS
	  	
			
	5.01	  	When Company May Merge, etc.	  	34
	5.02	  	Successor Substituted.	  	34
			
		  	 VI. DEFAULTS AND REMEDIES
	  	
			
	6.01	  	Events of Default.	  	34
	6.02	  	Acceleration.	  	36
	6.03	  	Other Remedies.	  	38
	6.04	  	Waiver of Past Defaults.	  	38
	6.05	  	Control by Majority.	  	38
	6.06	  	Limitation on Suits.	  	38
	6.07	  	Rights of Holders to Receive Payment.	  	39
	6.08	  	Collection Suit by Trustee.	  	39
	6.09	  	Trustee May File Proofs of Claim.	  	39
	6.10	  	Priorities.	  	40
	6.11	  	Undertaking for Costs.	  	40
			
		  	 VII. TRUSTEE
	  	
			
	7.01	  	Duties of Trustee.	  	40
	7.02	  	Rights of Trustee.	  	41
	7.03	  	Individual Rights of Trustee.	  	43
	7.04	  	Trustee’s Disclaimer.	  	43
	7.05	  	Notice of Defaults.	  	43
	7.06	  	Reports by Trustee to Holders.	  	43
	7.07	  	Compensation and Indemnity.	  	43
	7.08	  	Replacement of Trustee.	  	44
	7.09	  	Successor Trustee by Merger, etc.	  	45
	7.10	  	Eligibility; Disqualification.	  	45
	7.11	  	Preferential Collection of Claims Against Company.	  	45
			
		  	 VIII. DISCHARGE OF INDENTURE
	  	
			
	8.01	  	Termination of the Obligations of the Company.	  	45

  

 -ii- 

					
	8.02	  	Application of Trust Money.	  	46
	8.03	  	Repayment to Company.	  	46
	8.04	  	Reinstatement.	  	47
			
		  	 IX. AMENDMENTS
	  	
			
	9.01	  	Without Consent of Holders.	  	47
	9.02	  	With Consent of Holders.	  	48
	9.03	  	Compliance with Trust Indenture Act.	  	49
	9.04	  	Revocation and Effect of Consents.	  	49
	9.05	  	Notation on or Exchange of Securities.	  	49
	9.06	  	Trustee Protected.	  	49
	9.07	  	Effect of Supplemental Indentures.	  	50
			
		  	 X. CONVERSION
	  	
			
	10.01	  	Conversion Privilege; Restrictive Legends.	  	50
	10.02	  	Conversion Procedure.	  	50
	10.03	  	Fractional Shares.	  	52
	10.04	  	Taxes on Conversion.	  	52
	10.05	  	Company to Provide Stock.	  	52
	10.06	  	Adjustment of Conversion Rate.	  	52
	10.07	  	No Adjustment.	  	58
	10.08	  	Other Adjustments.	  	59
	10.09	  	Adjustments for Tax Purposes.	  	60
	10.10	  	Notice of Adjustment.	  	60
	10.11	  	Notice of Certain Transactions.	  	60
	10.12	  	Effect of Reclassifications, Consolidations, Mergers, Binding Share Exchanges or Sales on Conversion Privilege.	  	61
	10.13	  	Trustee’s Disclaimer.	  	62
	10.14	  	Rights Distributions Pursuant to Stockholders’ Rights Plans.	  	63
	10.15	  	Adjustment to the Conversion Rate on April 1, 2008.	  	63
	10.16	  	Increased Conversion Rate Applicable to Certain Notes Surrendered in Connection With Make-Whole Fundamental Changes.	  	64
			
		  	 XI. MISCELLANEOUS
	  	
			
	11.01	  	Trust Indenture Act Controls.	  	67
	11.02	  	Notices.	  	67
	11.03	  	Communication by Holders with Other Holders.	  	68
	11.04	  	Certificate and Opinion as to Conditions Precedent.	  	68
	11.05	  	Statements Required in Certificate or Opinion.	  	69
	11.06	  	Rules by Trustee and Agents.	  	69
	11.07	  	Legal Holidays.	  	69
	11.08	  	Duplicate Originals.	  	69
	11.09	  	Governing Law.	  	70
	11.10	  	No Adverse Interpretation of Other Agreements.	  	70

  

 -iii- 

					
	11.11	  	Successors.	  	70
	11.12	  	Separability.	  	70
	11.13	  	Table of Contents, Headings, etc.	  	70
	11.14	  	Calculations in Respect of the Securities.	  	70
	11.15	  	No Personal Liability of Directors, Officers, Employees or Stockholders.	  	70

  

					
	Exhibit A	  	-         Form of Global Security
	Exhibit B-1	  	-         Form of Private Placement Legend
	Exhibit B-2	  	-         Form of Legend for Global Security
	Exhibit C	  	-         Form of Notice of Transfer Pursuant to Registration Statement

  

 -iv- 

 INDENTURE, dated as of March 28, 2007, between Diversa Corporation, a Delaware corporation
(the “Company”), and Wells Fargo Bank, National Association, as trustee (the “Trustee”). 
 Each party
agrees as follows for the benefit of the other party and for the equal and ratable benefit of the Holders of the Company’s 5.50% Convertible Senior Notes due 2027 (the “Securities”). 
 I. DEFINITIONS AND INCORPORATION BY REFERENCE 
 1.01
DEFINITIONS. 
 The term “additional interest” has the meaning ascribed to it in the Registration
Rights Agreement. 
 “Affiliate” means any person directly or indirectly controlling or controlled by or under direct or
indirect common control with the Company. For this purpose, “control” shall mean the power to direct the management and policies of a person through the ownership of securities, by contract or otherwise. 
 “Asset Sale Make-Whole Fundamental Change” means a sale, transfer, lease, conveyance or other disposition of all or substantially all of
the property or assets of the Company, or of the Company and the Subsidiaries on a consolidated basis, to any “person” or “group” (as such terms are used in Sections 13(d) and 14(d) of the Exchange Act), including any group
acting for the purpose of acquiring, holding, voting or disposing of securities within the meaning of Rule 13d-5(b)(1) under the Exchange Act. 
 “Board of Directors” means the Board of Directors of the Company or any committee thereof 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. 
 “Capital Stock” of any Person means any and all
shares, interests, participations or other equivalents (however designated) of capital stock of such Person and all warrants or options to acquire such capital stock. 
 “Closing Sale Price” means the price of a share of Common Stock on the relevant date, determined (a) on the basis of the closing sale price per share of Common Stock (or if no closing sale price
per share of Common Stock is reported, the average of the bid and ask prices per share of Common Stock or, if more than one in either case, the average of the average bid and the average ask prices per share of Common Stock) on such date on the U.S.
principal national securities exchange on which the Common Stock is listed; or (b) if the Common Stock is not listed on a U.S. national securities exchange, as reported by National Quotation Bureau, Incorporated or a similar organization. In
the absence of a quotation, the Closing Sale Price shall be such price as the Company shall reasonably determine on the basis of such quotations as most accurately reflecting the price that a fully informed buyer, acting on 

  

 -1- 

 
his own accord, would pay to a fully informed seller, acting on his own accord in an arms-length transaction, for a share of such Common Stock. 

“Common Stock” means the common stock, $0.001 par value per share, of the Company, or such other Capital Stock of the Company into
which the Company’s common stock is reclassified or changed. 
 “Common Stock Change Make-Whole Fundamental Change”
means any transaction or series of related transactions (other than a Listed Stock Business Combination), in connection with which (whether by means of an exchange offer, liquidation, tender offer, consolidation, merger, combination,
reclassification, recapitalization, asset sale, lease of assets or otherwise) the Common Stock is exchanged for, converted into, acquired for or constitutes solely the right to receive other securities, other property, assets or cash. 
 “Company” means the party named as such above until a successor replaces it pursuant to the applicable provision hereof and thereafter
means the successor. The foregoing sentence shall likewise apply to any such successor or subsequent successor. 
 “Company
Order” or “Company Request” means a written request or order signed on behalf of the Company by any Officer and delivered to the Trustee. 
 “Conversion Price” means, as of any date of determination, the dollar amount derived by dividing one thousand dollars ($1,000) by the Conversion Rate in effect on such date. 
 “Conversion Rate” means the number of shares of Common Stock issuable upon conversion of a Security per $1,000 principal amount, which
Conversion Rate shall initially be 122.5490 shares of Common Stock per $1,000 principal amount of Securities, subject to adjustment as provided in Article X. 
 “Corporate Trust Office of the Trustee” shall be at the address of the Trustee specified in Section 11.02 or such other address as the Trustee may give notice of to the Company.

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

“Depositary” means The Depository Trust Company, its nominees and successors. 
 “Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations of the SEC thereunder. 

“Holder” or “Securityholder” means a person in whose name a Security is registered on the Registrar’s books.

 “Indebtedness” of a person means the principal of, premium, if any, and interest on, and all other obligations in respect
of (a) all indebtedness of such person for borrowed money (including all indebtedness evidenced by notes, bonds, debentures or other securities), (b) all obligations (other than trade payables) incurred by such person in the acquisition
(whether by way of purchase, 

  

 -2- 

 
merger, consolidation or otherwise and whether by such person or another person) of any business, real property or other assets, (c) all reimbursement
obligations of such person with respect to letters of credit, bankers’ acceptances or similar facilities issued for the account of such person, (d) all capital lease obligations of such person, (e) all net obligations of such person
under interest rate swap, currency exchange or similar agreements of such person, (f) all obligations and other liabilities, contingent or otherwise, under any lease or related document, including a purchase agreement, conditional sale or other
title retention agreement, in connection with the lease of real property or improvements thereon (or any personal property included as part of any such lease) which provides that such person is contractually obligated to purchase or cause a third
party to purchase the leased property or pay an agreed-upon residual value of the leased property, including such person’s obligations under such lease or related document to purchase or cause a third party to purchase such leased property or
pay an agreed-upon residual value of the leased property to the lessor, (g) guarantees by such person of indebtedness described in clauses (a) through (f) of another person, and (h) all renewals, extensions, refundings,
deferrals, restructurings, amendments and modifications of any indebtedness, obligation, guarantee or liability of the kind described in clauses (a) through (g). 
 “Indenture” means this Indenture as amended or supplemented from time to time. 
 “Initial Purchasers” means UBS Securities LLC, Jefferies & Company, Inc., Canaccord Adams Inc. and Cantor Fitzgerald &
Co. 
 “Issue Date” means March 28, 2007. 
 “Make-Whole Fundamental Change” means an Asset Sale Make-Whole Fundamental Change or a Common Stock Change Make-Whole Fundamental Change
that occurs before April 5, 2012. 
 “Market Disruption Event” means either (i) a failure by the primary United
States national securities exchange or market on which the Common Stock is listed or admitted to trading to open for trading during its regular trading session; or (ii) the occurrence or existence prior to 1:00 p.m. on any Trading Day for the
Common Stock for an aggregate of at least thirty (30) minutes of any suspension or limitation imposed on trading (by reason of movements in price exceeding limits permitted by the stock exchange or otherwise) in the Common Stock or in any
options, contracts or future contracts relating to the Common Stock. 
 “Maturity Date” means April 1, 2027.

 “Offering Memorandum” means the final Offering Memorandum of the Company, dated March 22, 2007, relating to the
Securities and the Company’s 5.50% Convertible Senior Notes due 2027. 
 “Officer” means the Chairman of the Board, the
Chief Executive Officer, the President, the Chief Operating Officer, the Chief Financial Officer, any Executive Vice President, any Vice President, the Treasurer, any Assistant Treasurer, the Secretary or any Assistant Secretary of the Company.

 “Officer’s Certificate” means a certificate signed by one Officer of the Company. 
  

 -3- 

 “Opinion of Counsel” means a written opinion from legal counsel who may be an employee
of or counsel for the Trustee or the Company, or other counsel reasonably acceptable to the Trustee. 
 “Option” means the
Initial Purchasers’ option to acquire up to $20,000,000 aggregate principal amount of additional Securities (“Additional Securities”) as provided for in the Purchase Agreement. 
 “Person” or “person” means any individual, corporation, partnership, limited liability company, joint venture,
association, joint-stock company, trust, unincorporated organization or government or other agency or political subdivision thereof. 
 “Purchase Agreement” means the Purchase Agreement dated March 22, 2007 among the Company and the Initial Purchasers. 
 “Purchase Notice” means a Purchase Notice in the form set forth in the Securities. 
 “QIB” means
a “qualified institutional buyer” within the meaning of Rule 144A under the Securities Act. 
 “Redemption Date”
means the date specified for Redemption of the Securities in accordance with the terms of the Securities and this Indenture. 
 “Redemption Price” means, with respect to a Security to be redeemed by the Company in accordance with Article III, one hundred percent (100%) of the outstanding principal amount of such Security to be redeemed.

 “Registration Rights Agreement” means the Registration Rights Agreement dated as of the date hereof among the Company and
the Initial Purchasers. 
 “Responsible Officer” shall mean, when used with respect to the Trustee, any officer within the
corporate trust department 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 is referred because of such person’s knowledge of and familiarity with the particular subject and who shall have direct
responsibility for the administration of this Indenture. 
 “Restricted Security” means a Security that constitutes a
“restricted security” within the meaning of Rule 144(a)(3) under the Securities Act; provided, however, that the Trustee shall be entitled to request and conclusively rely on an Opinion of Counsel with respect to whether any
Security constitutes a Restricted Security. 
 “Rights Agreement” means that certain Rights Agreement by and between the
Company and American Stock Transfer and Trust Company, as Rights Agent dated December 13, 2000, as the same may be amended, supplemented or superseded. 
 “Rule 144A” means Rule 144A under the Securities Act. 
  

 -4- 

 “SEC” means the Securities and Exchange Commission. 
 “Securities” means the 5.50% Convertible Senior Notes due 2027 issued by the Company pursuant to this Indenture. 
 “Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations of the SEC thereunder. 
 “Securities Agent” means any Registrar, Paying Agent, Conversion Agent or co-Registrar or co-agent. 
 “Significant Subsidiary” with respect to any person means any subsidiary (as defined in Rule 1-02(x) of Regulation S-X under the
Securities Act) of such person that constitutes a “significant subsidiary” within the meaning of Rule 1-02(w) of Regulation S-X under the Securities Act, as such regulation is in effect on the date of this Indenture. 
 “Subsidiary” means (i) a corporation a majority of whose Capital Stock with voting power, under ordinary circumstances, to elect
directors is at the time, directly or indirectly, owned by the Company, by one or more subsidiaries of the Company or by the Company and one or more of its subsidiaries or (ii) any other person (other than a corporation) in which the Company,
one or more of its subsidiaries, or the Company and one or more of its subsidiaries, directly or indirectly, at the date of determination thereof, own at least a majority ownership interest. 
 “TIA” means the Trust Indenture Act of 1939 (15 U.S. Code §§ 77aaa-77bbbb) as amended and in effect from time to time.

 “Trading Day” means any day during which all of the following conditions are satisfied: (i) trading in the Common
Stock generally occurs; (ii) there is no Market Disruption Event; and (iii) a closing sale price for the Common Stock is provided on the NASDAQ Global Market or, if the Common Stock is not then listed on the NASDAQ Global 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 listed on a U.S. national or regional securities exchange, on the principal other market on which the Common Stock
is then traded. 
 “Trustee” means the party named as such in this Indenture until a successor replaces it in accordance
with the provisions hereof and thereafter means the successor. 
 “Voting Stock” of any Person means the total voting power
of all classes of the Capital Stock of such Person entitled to vote generally in the election of directors of such Person. 
 1.02 OTHER
DEFINITIONS. 
  

			
	 Term
	  	Defined in Section
	 “Acquisition of Voting Control”
	  	3.09
	 “Additional Securities”
	  	1.01
	 “Aggregate Amount”
	  	10.06

  

 -5- 

			
	 “Applicable Price”
	  	10.16
	 “Bankruptcy Law”
	  	6.01
	 “BCF Adjustment Cap”
	  	10.07
	 “BCF Make-Whole Cap”
	  	10.16
	 “Business Day”
	  	11.07
	 “Celunol Merger”
	  	3.09
	 “Change in Control”
	  	3.09
	 “Collective Election”
	  	10.12
	 “Conversion Agent”
	  	2.03
	 “Conversion Date”
	  	10.02
	 “Conversion Shares”
	  	10.06
	 “Custodian”
	  	6.01
	 “Effective Date”
	  	10.16
	 “Event of Default”
	  	6.01
	 “Ex Date”
	  	10.06
	 “Expiration Date”
	  	10.06
	 “Expiration Time”
	  	10.06
	 “Floor Price”
	  	10.15
	 “Fundamental Change”
	  	3.09
	 “Fundamental Change Notice”
	  	3.09
	 “Fundamental Change Repurchase Date”
	  	3.09
	 “Fundamental Change Repurchase Price”
	  	3.09
	 “Fundamental Change Repurchase Right”
	  	3.09
	 “Global Security”
	  	2.01
	 “Legal Holiday”
	  	11.07
	 “Listed Stock Business Combination”
	  	3.09
	 “Make-Whole Applicable Increase”
	  	10.16
	 “Make-Whole Conversion Period”
	  	10.16
	 “Make-Whole Consideration”
	  	10.16
	 “Notice of Default”
	  	6.01
	 “Option Purchase Date”
	  	3.08
	 “Option Purchase Notice”
	  	3.08
	 “Option Purchase Price”
	  	3.08
	 “Participants”
	  	2.15
	 “Paying Agent”
	  	2.03
	 “Physical Securities”
	  	2.01
	 “Private Placement Legend”
	  	2.17
	 “Purchase at Holder’s Option”
	  	3.01
	 “Purchased Shares”
	  	10.06
	 “Redemption”
	  	3.01
	 “Reference Property”
	  	10.12
	 “Registrar”
	  	2.03
	 “Repurchase Upon Fundamental Change”
	  	3.01
	 “Resale Restriction Termination Date”
	  	2.17
	 “Rights”
	  	10.06
	 “Spin-Off”
	  	10.06

  

 -6- 

			
	 “Special Interest”
	  	6.02
	 “Termination of Trading”
	  	3.09
	 “Trigger Event”
	  	10.06
	 “Underlying Shares”
	  	10.06
	 “Volume Weighted Average Price”
	  	10.15

 1.03 INCORPORATION BY REFERENCE OF
TRUST INDENTURE ACT. 
 Whenever this Indenture refers to a provision of the TIA, the
provision is incorporated by reference in and made a part of this Indenture. 
 The following TIA terms used in this Indenture have the
following meanings: 
 “Commission” means the SEC; 
 “indenture securities” means the Securities; 
 “indenture security holder” means a Securityholder or a Holder; 
 “indenture to be
qualified” means this Indenture; 
 “indenture trustee” or “institutional trustee” means the
Trustee; and 
 “obligor” on the indenture securities means the Company or any successor. 
 All other terms used in this Indenture that are defined by the TIA, defined by the TIA by reference to another statute or defined by SEC rule under the
TIA and not otherwise defined herein have the meanings so assigned to them. 
 1.04 RULES OF
CONSTRUCTION. 
 Unless the context otherwise requires: 
 (i) a term has the meaning assigned to it; 
 (ii) an accounting term not otherwise defined has the meaning assigned to it in accordance with generally accepted accounting principles in effect from time to time; 
 (iii) “or” is not exclusive; 
 (iv) “including” means “including without limitation”; 
 (v) words in the
singular include the plural and in the plural include the singular; 
 (vi) provisions apply to successive events and
transactions; 
 (vii) the term “interest” includes additional interest, unless the context otherwise
requires or unless the terms of the Registration Rights Agreement provide otherwise; 
  

 -7- 

 (viii) “herein,” “hereof” and other words of similar import refer to
this Indenture as a whole and not to any particular Article, Section or other subdivision of this Indenture; and 
 (ix)
references to currency shall mean the lawful currency of the United States of America, unless the context requires otherwise. 
 II. THE
SECURITIES 
 2.01 FORM AND DATING. 
 The Securities and the Trustee’s certificate of authentication shall be substantially in the form set forth in Exhibit A, which is
incorporated in and forms a part of this Indenture. The Securities may have notations, legends or endorsements required by law, stock exchange rule or usage. Each Security shall be dated the date of its authentication. 
 Securities offered and sold in reliance on Rule 144A shall be issued initially in the form of one or more Global Securities, substantially in the form
set forth in Exhibit A (the “Global Security”), registered in the name of the Depositary or a nominee thereof, deposited with the Trustee, as custodian for the Depositary, duly executed by the Company and authenticated by the
Trustee as hereinafter provided and bearing the legends set forth in Exhibits B-1 and B-2. The aggregate principal amount of the Global Security may from time to time be increased or decreased by adjustments made on the records of the
Trustee, as custodian for the Depositary, as hereinafter provided; provided, that, except as permitted by Section 2.19, in no event shall the aggregate principal amount of the Global Security or Securities exceed $100,000,000 (or
$120,000,000 if the Initial Purchasers elect to purchase all of the Additional Securities pursuant to the Option). 
 Securities issued in
exchange for interests in a Global Security pursuant to Section 2.15 may be issued in the form of permanent certificated Securities in registered form in substantially the form set forth in Exhibit A (the “Physical
Securities”) and, if applicable, bearing any legends required by Section 2.17. 
 2.02 EXECUTION AND
AUTHENTICATION. 
 One duly authorized Officer shall sign the Securities for the Company by manual or facsimile signature.

 A Security’s validity shall not be affected by the failure of an Officer whose signature is on such Security to hold, at the time the
Security is authenticated, the same office at the Company. 
 A Security shall not be valid until authenticated by the manual signature of
the Trustee. The signature shall be conclusive evidence that the Security has been authenticated under this Indenture. 
  

 -8- 

 Upon a written order of the Company signed by one Officer of the Company, the Trustee shall authenticate
Securities for original issue in the aggregate principal amount of $100,000,000 and such additional principal amount, if any, as shall be determined pursuant to the next sentence of this Section 2.02. Upon receipt by the Trustee of an
Officer’s Certificate stating that the Initial Purchasers have elected to purchase from the Company a specified principal amount of Additional Securities, not to exceed $20,000,000, pursuant to the Option, the Trustee shall authenticate and
deliver such specified principal amount of Additional Securities to or upon the written order of the Company signed as provided in the immediately preceding sentence. Such Officer’s Certificate must be received by the Trustee not later than the
proposed date for delivering of such Additional Securities. The aggregate principal amount of Securities outstanding at any time may not exceed $100,000,000 except as provided in this Section 2.02 or in Section 2.19.

 Upon a Company Order, the Trustee shall authenticate Securities not bearing the Private Placement Legend to be issued to the transferee
when sold pursuant to an effective registration statement under the Securities Act as set forth in Section 2.16(B). 
 The
Trustee shall act as the initial authenticating agent. Thereafter, the Trustee may appoint an authenticating agent acceptable to the Company to authenticate Securities. An authenticating agent may authenticate Securities whenever the Trustee may do
so. Each reference in this Indenture to authentication by the Trustee includes authentication by such authenticating agent. An authenticating agent has the same rights as a Securities Agent to deal with the Company and its Affiliates. 
 If a Company Order pursuant to this Section 2.02 has been, or simultaneously is, delivered, any instructions by the Company to the Trustee
with respect to endorsement, delivery or redelivery of a Security issued in global form shall be in writing but need not comply with Section 11.04 hereof and need not be accompanied by an Opinion of Counsel. 
 The Securities shall be issuable only in registered form without interest coupons and only in denominations of $1,000 principal amount and any integral
multiple thereof. 
 2.03 REGISTRAR, PAYING AGENT AND CONVERSION
AGENT. 
 The Company shall maintain, or shall cause to be maintained, an office or agency in the United States where
Securities may be presented for registration of transfer or for exchange (“Registrar”), an office or agency in the United States where Securities may be presented for payment (“Paying Agent”) and an office or agency
in the United States where Securities may be presented for conversion (“Conversion Agent”). The Registrar shall keep a register of the Securities and of their transfer and exchange. The Company may appoint or change one or more
co-Registrars, one or more additional paying agents and one or more additional conversion agents without notice and may act in any such capacity on its own behalf. The term “Registrar” includes any co-Registrar; the term
“Paying Agent” includes any additional paying agent; and the term “Conversion Agent” includes any additional conversion agent. 
 The Company shall enter into an appropriate agency agreement with any Securities Agent not a party to this Indenture. The agreement shall implement the provisions of this Indenture that relate to such Securities
Agent. The Company shall notify the Trustee 

  

 -9- 

 
of the name and address of any Securities Agent not a party to this Indenture. If the Company fails to maintain a Registrar, Paying Agent or Conversion
Agent, the Trustee shall act as such. 
 The Company initially appoints the Trustee as Paying Agent, Registrar and Conversion Agent.

 2.04 PAYING AGENT TO HOLD MONEY IN TRUST.

 Each Paying Agent shall hold in trust for the benefit of the Securityholders or the Trustee all moneys held by the Paying Agent for the
payment of the Securities, and shall notify the Trustee of any Default by the Company in making any such payment. While any such Default continues, the Trustee may require a Paying Agent to pay all money held by it to the Trustee. The Company at any
time may require a Paying Agent to pay all money held by it to the Trustee. Upon payment over to the Trustee, the Paying Agent shall have no further liability for such money. If the Company acts as Paying Agent, it shall segregate and hold as a
separate trust fund all money and, if applicable, other property held by it as Paying Agent. 
 2.05 SECURITYHOLDER
LISTS. 
 The Trustee shall preserve in as current a form as is reasonably practicable the most recent list available to it
of the names and addresses of Securityholders. If the Trustee is not the Registrar, the Company shall furnish, or shall cause to be furnished, to the Trustee no later than three Business Days before each interest payment date, and at such other
times as the Trustee may request in writing, a list, in such form and as of such date as the Trustee may reasonably require, of the names and addresses of Securityholders. 
 2.06 TRANSFER AND EXCHANGE. 
 Subject to Sections
2.15 and 2.16 hereof, where Securities are presented to the Registrar with a request to register their transfer or to exchange them for an equal principal amount of Securities of other authorized denominations, the Registrar shall
register the transfer or make the exchange if its requirements for such transaction are met. To permit registrations of transfer and exchanges, the Trustee shall authenticate Securities at the Registrar’s request or upon the Trustee’s
receipt of a Company Order therefor. The Company or the Trustee, as the case may be, shall not be required to register the transfer of or exchange any Security (i) for a period of fifteen (15) days before selecting, pursuant to
Section 3.03, Securities to be redeemed or (ii) during a period beginning at the opening of business fifteen (15) days before the delivery of a notice of redemption of the Securities selected for Redemption under
Section 3.04 and ending at the close of business on the day of such delivery or (iii) that has been selected for Redemption or for which a Purchase Notice has been delivered, and not withdrawn, in accordance with this Indenture,
except the unredeemed or unrepurchased portion of Securities being redeemed or repurchased in part. 
 No service charge shall be made for
any transfer, exchange or conversion of Securities, but the Company may require payment of a sum sufficient to cover any transfer tax or similar governmental charge that may be imposed in connection with any transfer, exchange or conversion of
Securities, other than exchanges pursuant to Sections 2.10, 9.05 or 10.02, or Article III, not involving any transfer. 
  

 -10- 

 2.07 REPLACEMENT SECURITIES. 
 If the Holder of a Security claims that the Security has been mutilated, lost, destroyed or wrongfully taken, the Company shall issue and the Trustee
shall authenticate a replacement Security upon surrender to the Trustee of the mutilated Security, or upon delivery to the Trustee of evidence of the loss, destruction or theft of the Security satisfactory to the Trustee and the Company. In the case
of a lost, destroyed or wrongfully taken Security, if required by the Trustee or the Company, an indemnity bond must be provided by the Holder that is reasonably satisfactory to the Trustee and the Company to indemnify and hold harmless the Company,
the Trustee or any Securities Agent from any loss which any of them may suffer if such Security is replaced. The Trustee and the Company may charge such Holder for their expenses in replacing a Security. 
 In case any such mutilated, lost, destroyed or wrongfully taken Security has become or is about to become due and payable, the Company in its discretion
may, instead of issuing a new Security, pay such Security when due. 
 Every replacement Security is an additional obligation of the Company
only as provided in Section 2.08. 
 2.08 OUTSTANDING SECURITIES. 
 Securities outstanding at any time are all the Securities authenticated by the Trustee except for those converted, those cancelled by it, those delivered
to it for cancellation and those described in this Section 2.08 as not outstanding. Except to the extent provided in Section 2.09, a Security does not cease to be outstanding because the Company or one of its Subsidiaries or
Affiliates holds the Security. 
 If a Security is replaced pursuant to Section 2.07, it ceases to be outstanding unless the
Trustee receives proof satisfactory to it, or a court holds, that the replaced Security is held by a protected purchaser. 
 If the Paying
Agent (other than the Company) holds on an Option Purchase Date, Redemption Date, Fundamental Change Repurchase Date or Maturity Date, money sufficient to pay the aggregate Option Purchase Price, Redemption Price, Fundamental Change Repurchase Price
or principal amount, as the case may be, with respect to all Securities to be redeemed, purchased or paid upon Purchase at Holder’s Option, Redemption, Repurchase Upon Fundamental Change or maturity, as the case may be, in each case plus, if
applicable, accrued and unpaid interest, if any, payable as herein provided upon Purchase at Holder’s Option, Redemption, Repurchase Upon Fundamental Change or maturity, then (unless there shall be a Default in the payment of such aggregate
Option Purchase Price, Redemption Price, Fundamental Change Repurchase Price or principal amount, or of such accrued and unpaid interest), except as otherwise provided herein, on and after such date such Securities shall be deemed to be no longer
outstanding, interest on such Securities shall cease to accrue, and such Securities shall be deemed paid whether or not such Securities are delivered to the Paying Agent. Thereafter, all rights of the Holders of such Securities shall terminate with
respect to such Securities, other than 

  

 -11- 

 
the right to receive the Option Purchase Price, Redemption Price, Fundamental Change Repurchase Price or principal amount, as the case may be, plus, if
applicable, such accrued and unpaid interest, in accordance with this Indenture. 
 If a Security is converted in accordance with Article
X, then, from and after the time of such conversion on the Conversion Date, such Security shall cease to be outstanding, and interest, if any, shall cease to accrue on such Security unless there shall be a Default in the payment or delivery of
the consideration payable hereunder upon such conversion. 
 2.09 SECURITIES HELD BY THE
COMPANY OR AN AFFILIATE. 
 In determining whether the Holders of the required
aggregate principal amount of Securities have concurred in any direction, waiver or consent, Securities owned by the Company or any of its Subsidiaries or Affiliates shall be considered as though not outstanding, except that, for the purposes of
determining whether a Responsible Officer of the Trustee shall be protected in relying on any such direction, waiver or consent, only Securities which the Trustee knows are so owned shall be so disregarded. Securities so owned which have been
pledged in good faith may be considered to be outstanding for purposes of this Section 2.09 if the pledgee establishes, to the satisfaction of the Trustee, the pledgee’s right so to concur with respect to such Securities and that
the pledgee is not, and is not acting at the direction or on behalf of, the Company, any other obligor on the Securities, an Affiliate of the Company or an affiliate of any such other obligor. In the event of a dispute as to whether the pledgee has
established the foregoing, the Trustee may rely on the advice of counsel or on an Officer’s Certificate. 
 2.10 TEMPORARY
SECURITIES. 
 Until definitive Securities are ready for delivery, the Company may prepare and the Trustee shall
authenticate temporary Securities. Temporary Securities shall be substantially in the form of definitive Securities but may have variations that the Company considers appropriate for temporary Securities. Without unreasonable delay, the Company
shall prepare and the Trustee shall authenticate definitive Securities in exchange for temporary Securities. Until so exchanged, each temporary Security shall in all respects be entitled to the same benefits under this Indenture as definitive
Securities, and such temporary Security shall be exchangeable for definitive Securities in accordance with the terms of this Indenture. 
 2.11
CANCELLATION. 
 The Company at any time may deliver Securities to the Trustee for cancellation. The Registrar, Paying
Agent and Conversion Agent shall forward to the Trustee any Securities surrendered to them for transfer, exchange, payment or conversion. The Trustee shall promptly cancel all Securities surrendered for transfer, exchange, payment, conversion or
cancellation in accordance with its customary procedures. The Company may not issue new Securities to replace Securities that it has paid or delivered to the Trustee for cancellation or that any Securityholder has converted pursuant to Article
X. 
  

 -12- 

 2.12 DEFAULTED INTEREST. 
 If and to the extent the Company defaults in a payment of interest on the Securities, the Company shall pay in cash the defaulted interest in any lawful
manner plus, to the extent not prohibited by applicable statute or case law, interest on such defaulted interest at the rate provided in the Securities. The Company may pay the defaulted interest (plus interest on such defaulted interest) to the
persons who are Securityholders on a subsequent special record date. The Company shall fix such record date and payment date. At least fifteen (15) calendar days before the record date, the Company shall deliver or cause to be delivered to
Securityholders a notice that states the record date, payment date and amount of interest to be paid. Upon the due payment in full, interest shall no longer accrue on such defaulted interest pursuant to this Section 2.12. 
 2.13 CUSIP NUMBERS. 
 The Company in
issuing the Securities may use one or more “CUSIP” numbers, and, if so, the Trustee shall use the CUSIP numbers in notices of redemption or exchange as a convenience to Holders; provided, however, that no representation is
hereby deemed to be made by the Trustee as to the correctness or accuracy of the CUSIP numbers printed on the notice or on the Securities; provided further, that reliance may be placed only on the other identification numbers printed on the
Securities, and the effectiveness of any such notice shall not be affected by any defect in, or omission of, such CUSIP numbers. The Company shall promptly notify the Trustee of any change in the CUSIP numbers. 
 2.14 DEPOSIT OF MONEYS. 
 Prior to 11:00 A.M., New York City time, on each interest payment date, Maturity Date, Redemption Date, Option Purchase Date or Fundamental Change Repurchase Date, the Company shall deposit with a Paying Agent (or, if
the Company is acting as its own Paying Agent, segregate and hold in trust in accordance with Section 2.04) money, in funds immediately available on such date, sufficient to make cash payments, if any, due on such interest payment date,
Maturity Date, Redemption Date, Option Purchase Date or Fundamental Change Repurchase Date, as the case may be, in a timely manner which permits the Paying Agent to remit payment to the Holders on such interest payment date, Maturity Date,
Redemption Date, Option Purchase Date or Fundamental Change Repurchase Date, as the case may be. 
 2.15 BOOK-ENTRY
PROVISIONS FOR GLOBAL SECURITIES. 
 (A) The Global Securities initially shall
(i) be registered in the name of the Depositary or the nominee of the Depositary, (ii) be delivered to the Trustee as custodian for the Depositary and (iii) bear legends as set forth in Section 2.17. 
 Members of, or participants in, the Depositary (“Participants”) shall have no rights under this Indenture with respect to any Global
Security held on their behalf by the Depositary, or the Trustee as its custodian, or under the Global Security, and the Depositary may be treated by the Company, the Trustee and any agent of the Company or the Trustee as the absolute owner of the
Global Security for all purposes whatsoever. Notwithstanding the foregoing, nothing herein shall prevent the Company, the Trustee or any agent of the Company or the Trustee from giving effect to any written certification, proxy or other
authorization furnished by the 

  

 -13- 

 
Depositary or impair, as between the Depositary and Participants, the operation of customary practices governing the exercise of the rights of a Holder of
any Security. 
 (B) Transfers of Global Securities shall be limited to transfers in whole, but not in part, to the Depositary, its
successors or their respective nominees. In addition, Physical Securities shall be transferred to all beneficial owners, as identified by the Depositary, in exchange for their beneficial interests in Global Securities only if (i) the Depositary
notifies the Company that the Depositary is unwilling or unable to continue as depositary for any Global Security (or the Depositary ceases to be a “clearing agency” registered under Section 17A of the Exchange Act) and a successor
Depositary is not appointed by the Company within ninety (90) days of such notice or cessation or (ii) an Event of Default has occurred and is continuing and the Registrar has received a written request from the Depositary to issue
Physical Securities. 
 (C) In connection with the transfer of a Global Security in its entirety to beneficial owners pursuant to
Section 2.15(B), such Global Security shall be deemed to be surrendered to the Trustee for cancellation, and the Company shall execute, and the Trustee shall upon written instructions from the Company authenticate and deliver, to each
beneficial owner identified by the Depositary in exchange for its beneficial interest in such Global Security, an equal aggregate principal amount of Physical Securities of authorized denominations. 
 (D) Any Physical Security constituting a Restricted Security delivered in exchange for an interest in a Global Security pursuant to
Section 2.15(B) shall, except as otherwise provided by Section 2.16, bear the Private Placement Legend. 
 (E) The
Holder of any Global Security may grant proxies and otherwise authorize any Person, including Participants and Persons that may hold interests through Participants, to take any action which a Holder is entitled to take under this Indenture or the
Securities. 
 2.16 SPECIAL TRANSFER PROVISIONS. 
 (A) Restrictions on Transfer and Exchange of Global Securities. Notwithstanding any other provisions of this Indenture, but except as provided in
Section 2.15(B), a Global Security may not be transferred except as a whole by the Depositary to a nominee of the Depositary or by a nominee of the Depositary to the Depositary or another nominee of the Depositary or by the Depositary or
any such nominee to a successor Depositary or a nominee of such successor Depositary. 
 (B) Private Placement Legend. Upon the
transfer, exchange or replacement of Securities not bearing the Private Placement Legend, the Registrar or co-Registrar shall deliver Securities that do not bear the Private Placement Legend. Upon the transfer, exchange or replacement of Securities
bearing the Private Placement Legend, the Registrar or co-Registrar shall deliver only Securities that bear the Private Placement Legend unless (i) the requested transfer is after the Resale Restriction Termination Date, (ii) there is
delivered to the Trustee and the Company an opinion of counsel reasonably satisfactory to the Company and addressed to the Company to the effect that neither such legend nor the related restrictions on transfer are required in order to maintain
compliance with the provisions of the Securities Act or (iii) such Security has been sold pursuant to an effective registration statement under the 

  

 -14- 

 
Securities Act and the Holder selling such Securities has delivered to the Registrar or co-Registrar a notice in the form of Exhibit C hereto. Upon
the effectiveness, under the Securities Act, of the “Shelf Registration Statement” (as defined in the Registration Rights Agreement), the Company shall deliver to the Trustee a notice of effectiveness, a Global Security or Global
Securities, which do not bear the Private Placement Legend and an authentication order in accordance with Section 2.02 and, if required by the Depositary, the Company shall deliver to the Depositary a letter of representations in a form
reasonably acceptable to the Depositary. Upon the effectiveness of any post-effective amendment to the “Shelf Registration Statement” (as defined in the Registration Rights Agreement) and upon the effectiveness, under the Securities Act,
of any “Subsequent Shelf Registration Statement” (as defined in the Registration Rights Agreement), the Company shall deliver to the Trustee a notice of effectiveness. Upon any sale, pursuant to a Shelf Registration Statement, of a
beneficial interest in a Global Security that theretofore constituted a Restricted Security and delivery of appropriate evidence thereof to the Trustee, and upon any sale or transfer of a beneficial interest in connection with which the Private
Placement Legend will be removed in accordance with this Indenture, the Trustee shall increase the principal amount of the Global Security that does not constitute a Restricted Security by the principal amount of such sale or transfer and likewise
reduce the principal amount of the Global Security that does constitute a Restricted Security. 
 (C) General. By its acceptance of
any Security bearing the Private Placement Legend, each Holder of such a Security acknowledges the restrictions on transfer of such Security set forth in this Indenture and in the Private Placement Legend and agrees that it will transfer such
Security only as provided in this Indenture and as permitted by applicable law. 
 The Registrar shall retain copies of all letters, notices
and other written communications received pursuant to Section 2.15 or this Section 2.16. The Company shall have the right to inspect and make copies of all such letters, notices or other written communications at any
reasonable time upon the giving of reasonable written notice to the Registrar. 
 (D) Transfers of Securities Held by Affiliates. Any
Securities or shares of Common Stock issued upon the conversion of Securities that are purchased or owned by the Company or any Affiliate thereof may not be resold by the Company or such Affiliate 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 Securities or shares of Common Stock, as the case may be, no longer being Restricted Securities. For the avoidance of doubt,
solely with respect to Affiliates, the aforementioned sentence shall not constitute a covenant of the Company under this Indenture. 
 2.17
RESTRICTIVE LEGENDS. 
 Each Global Security and Physical Security that constitutes a Restricted Security
shall bear the legend (the “Private Placement Legend”) as set forth in Exhibit B-1 on the face thereof (1) until after the second anniversary of the later of (i) the Issue Date and (ii) the last date on which
the Company or any Affiliate was the owner of such Security (or any predecessor security) (or such shorter period of time as permitted by Rule 144(k) under the Securities Act or any successor provision thereunder) (or such longer period of time as
may be required under the Securities Act or applicable state securities laws, as set forth in an Opinion of Counsel, unless 

  

 -15- 

 
otherwise agreed between the Company and the Holder thereof) (such date, the “Resale Restriction Termination Date”); or (2) as
otherwise provided in or permitted by Section 2.16(B). 
 Each Global Security shall also bear the legend as set forth in
Exhibit B-2. 
 2.18 RANKING. 
 The indebtedness of the Company arising under or in connection with this Indenture and every outstanding Security issued under this Indenture from time to time constitutes and will constitute a senior unsecured
obligation of the Company, ranking equally with other existing and future senior unsecured indebtedness of the Company and ranking senior to any existing or future subordinated indebtedness of the Company. 
 2.19 ADDITIONAL SECURITIES. 
 The Company may, without the consent of the Holders and notwithstanding Sections 2.01 and 2.02 hereof, reopen the Securities and issue additional Securities hereunder with the same terms and conditions (except for any
difference in the issue price therefor and interest accrued prior to the date of issuance thereof) and with the same CUSIP number as the Securities initially issued hereunder in an unlimited aggregate principal amount, which will form the same
series with the Securities initially issued hereunder, provided that such additional Securities constitute the same issue as the Securities initially issued hereunder for U.S. federal income tax purposes. The Securities initially issued hereunder
and any such additional Securities would rank equally and ratably and would be treated as a single series of debt securities for all purposes under the Indenture. 
 III. REDEMPTION AND REPURCHASE 
 3.01 RIGHT OF REDEMPTION.

 (A) Redemption of the Securities, as permitted by any provision of this Indenture, shall be made: 
 (i) with respect to a repurchase at the Company’s option, in accordance with paragraphs 6 and 7 of the Securities (a
“Redemption”), 
 (ii) with respect to a repurchase at the Holder’s option, in accordance with
paragraph 8 of the Securities (a “Purchase at Holder’s Option”) and 
 (iii) with respect to any
repurchase upon a Fundamental Change, in accordance with paragraph 9 of the Securities (a “Repurchase Upon Fundamental Change”), 
 in each case in accordance with the applicable provisions of this Article III. 
  

 -16- 

 (B) The Company will comply with all federal and state securities laws, and the applicable laws of any
foreign jurisdiction, in connection with any offer to sell or solicitations of offers to buy Securities pursuant to this Article III. 
 (C) The Company shall not have the right to redeem any Securities prior to April 5, 2012. The Company shall have the right, at the Company’s option, at any time, and from time to time, on a Redemption Date on or after
April 5, 2012, to redeem all or any part of the Securities at a price payable in cash equal to the Redemption Price plus accrued and unpaid interest, if any, to, but excluding, the Redemption Date; provided, however, that in no
event shall any Redemption Date be a Legal Holiday; provided further, that if the Redemption Date with respect to a Security is after a record date for the payment of an installment of interest and on or before the related interest payment
date, then accrued and unpaid interest to, but excluding, such interest payment date shall be paid, on such interest payment date, to the Holder of record of such Security at the close of business on such record date, and the Holder surrendering
such Security for Redemption shall not be entitled to any such interest unless such Holder was also the Holder of record of such Security at the close of business on such record date. 
 (D) Securities in denominations larger than $1,000 principal amount may be redeemed in part but only in integral multiples of $1,000 principal amount.

 3.02 NOTICES TO TRUSTEE. 
 If the Company elects to redeem Securities pursuant to paragraph 6 of the Securities, it shall notify the Trustee of the Redemption Date, the applicable provision of this Indenture pursuant to which the
Redemption is to be made and the aggregate principal amount of Securities to be redeemed, which notice shall be provided to the Trustee by the Company at least fifteen (15) days prior to the delivery, in accordance with
Section 3.04, of the notice of Redemption (unless a shorter notice period shall be satisfactory to the Trustee). 
 3.03
SELECTION OF SECURITIES TO BE REDEEMED. 
 If
the Company has elected to redeem less than all the Securities pursuant to paragraph 6 of the Securities, the Trustee shall, within five (5) Business Days after receiving the notice specified in Section 3.02, select the
Securities to be redeemed by lot, on a pro rata basis or in accordance with any other method the Trustee considers fair and appropriate. The Trustee shall make such selection from Securities then outstanding and not already to be redeemed by
virtue of having been previously called for Redemption. The Trustee may select for Redemption portions of the principal amount of Securities that have denominations larger than $1,000 principal amount. Securities and portions of them the Trustee
selects for Redemption shall be in amounts of $1,000 principal amount or integral multiples of $1,000 principal amount. The Trustee shall promptly notify the Company in writing of the Securities selected for Redemption and the principal amount
thereof to be redeemed. 
 The Registrar need not register the transfer of or exchange any Securities that have been selected for Redemption,
except the unredeemed portion of the Securities being redeemed in part. 
  

 -17- 

 3.04 NOTICE OF REDEMPTION. 
 At least thirty (30) days but not more than sixty (60) days before a Redemption Date, the Company shall deliver, or cause to be delivered, a
notice of Redemption to each Holder whose Securities are to be redeemed, at the address of such Holder appearing in the security register. 
 The notice shall identify the Securities and the aggregate principal amount thereof to be redeemed pursuant to the Redemption and shall state: 
 (i) the Redemption Date; 
 (ii) the Redemption Price plus accrued and unpaid interest, if
any, to, but excluding, the Redemption Date; 
 (iii) the Conversion Rate and the Conversion Price; 
 (iv) the names and addresses of the Paying Agent and the Conversion Agent; 
 (v) that the right to convert the Securities called for Redemption will terminate at the close of business on the Business Day immediately
preceding the Redemption Date, unless there shall be a Default in the payment of the Redemption Price or accrued and unpaid interest, if any, payable as herein provided upon Redemption; 
 (vi) that Holders who want to convert Securities must satisfy the requirements of Article X; 
 (vii) the paragraph of the Securities pursuant to which the Securities are to be redeemed; 
 (viii) that Securities called for Redemption must be surrendered to the Paying Agent to collect the Redemption Price plus accrued and
unpaid interest, if any, payable as herein provided upon Redemption; 
 (ix) that, unless there shall be a Default in the
payment of the Redemption Price or accrued and unpaid interest, if any, payable as herein provided upon Redemption (including, where the Redemption Date is after a record date for the payment of an installment of interest and on or before the
related interest payment date, the payment, on such interest payment date, of accrued and unpaid interest to, but excluding, such interest payment date to the Holder of record at the close of business on such record date), interest on Securities
called for Redemption ceases to accrue on and after the Redemption Date, except as otherwise provided herein, such Securities will cease to be convertible after the close of business on the Business Day immediately preceding the Redemption Date, and
all rights of the Holders of such Securities shall terminate on and after the Redemption Date, other than the right to receive, upon surrender of such Securities and in accordance with this Indenture, the amounts due hereunder on such Securities
upon Redemption (and the rights of the Holder(s) of record of such Securities to receive, on the 

  

 -18- 

 
applicable interest payment date, accrued and unpaid interest in accordance herewith in the event the Redemption Date is after a record date for the payment
of an installment of interest and on or before the related interest payment date); and 
 (x) the CUSIP number or numbers, as
the case may be, of the Securities. 
 The right, pursuant to Article X, to convert Securities called for Redemption shall terminate
at the close of business on the Business Day immediately preceding the Redemption Date, unless there shall be a Default in the payment of the Redemption Price or accrued and unpaid interest, if any, payable as herein provided upon Redemption”.

 At the Company’s request, upon reasonable prior notice, the Trustee shall deliver the notice of Redemption in the Company’s name
and at the Company’s expense; provided, however, that the form and content of such notice shall be prepared by the Company. 
 3.05
EFFECT OF NOTICE OF REDEMPTION. 
 Once notice of Redemption
is delivered, Securities called for Redemption become due and payable on the Redemption Date at the consideration set forth herein, and, on and after such Redemption Date (unless there shall be a Default in the payment of such consideration), except
as otherwise provided herein, such Securities shall cease to bear interest, and all rights of the Holders of such Securities shall terminate, other than the right to receive such consideration upon surrender of such Securities to the Paying Agent.

 If any Security shall not be fully and duly paid in accordance herewith upon Redemption, the principal of, and accrued and unpaid interest
on, such Security shall, until paid, bear interest at the rate borne by such Security on the principal amount of such Security, and such Security shall continue to be convertible pursuant to Article X. 
 Notwithstanding anything herein to the contrary, there shall be no purchase of any Securities pursuant to a Redemption if the principal amount of the
Securities has been accelerated pursuant to Section 6.02 and such acceleration shall not have been rescinded on or before the applicable Redemption Date. The Paying Agent will promptly return to the respective Holders thereof any
Securities tendered to it for Redemption during the continuance of such an acceleration. 
 3.06 DEPOSIT OF
REDEMPTION PRICE. 
 Prior to 11:00 A.M., New York City time on the Redemption Date, the Company shall
deposit with a Paying Agent (or, if the Company is acting as its own Paying Agent, segregate and hold in trust in accordance with Section 2.04) money, in funds immediately available on the Redemption Date, sufficient to pay the
consideration payable as herein provided upon Redemption on all Securities to be redeemed on that date. The Paying Agent shall return to the Company, as soon as practicable, any money not required for that purpose. 
  

 -19- 

 3.07 SECURITIES REDEEMED IN PART. 
 Any Security to be submitted for Redemption only in part shall be delivered pursuant to Section 3.05 (with, if the Company or the Trustee so
requires, due endorsement by, or a written instrument of transfer in form satisfactory to the Company and the Trustee duly executed by, the Holder thereof or its attorney duly authorized in writing), and the Company shall execute, and the Trustee
shall authenticate and make available for delivery to the Holder of such Security without service charge, a new Security or Securities, of any authorized denomination as requested by such Holder, of the same tenor and in aggregate principal amount
equal to the portion of such Security not submitted for Redemption. 
 If any Security selected for partial Redemption is converted in part,
the principal of such Security subject to Redemption shall be reduced by the principal amount of such Security that is converted. 
 3.08
PURCHASE OF SECURITIES AT OPTION OF THE HOLDER. 
 (A) At the option of the Holder thereof, Securities (or portions thereof that are integral multiples of $1,000 in principal amount) shall be purchased by
the Company pursuant to paragraph 8 of the Securities on April 1, 2012, April 1, 2017 and April 1, 2022 (each, an “Option Purchase Date”), at a purchase price payable in cash, equal to one hundred percent
(100%) of the principal amount of the Securities (or such portions thereof) to be so purchased (the “Option Purchase Price”), plus accrued and unpaid interest, if any, to, but excluding, the applicable Option Purchase Date
(provided, that such accrued and unpaid interest shall be paid to the Holder of record of such Securities at the close of business on the record date immediately preceding such Option Purchase Date), upon: 
 (i) delivery to the Company (if it is acting as its own Paying Agent), or to a Paying Agent designated by the Company for such purpose in
the Option Purchase Notice, by such Holder, at any time from the opening of business on the date that is twenty (20) Business Days prior to the applicable Option Purchase Date until the close of business on the Business Day immediately
preceding the applicable Option Purchase Date, of a Purchase Notice, in the form set forth in the Securities or any other form of written notice substantially similar thereto, in each case, duly completed and signed, with appropriate signature
guarantee, stating: 
 (a) the certificate number(s) of the Securities which the Holder will deliver to be purchased, if such
Securities are in certificated form; 
 (b) the principal amount of Securities to be purchased, which must be $1,000 or an
integral multiple thereof; and 
 (c) that such principal amount of Securities are to be purchased as of the applicable Option
Purchase Date pursuant to the terms and conditions specified in paragraph 8 of the Securities and in this Indenture; and 
 (ii) delivery to the Company (if it is acting as its own Paying Agent), or to a Paying Agent designated by the Company for such purpose in the Option Purchase Notice, at any time after delivery of such Purchase Notice, of such Securities
(together 

  

 -20- 

 
with all necessary endorsements), such delivery being a condition to receipt by the Holder of the Option Purchase Price therefor plus accrued and unpaid
interest, if any, payable as herein provided upon Purchase at Holder’s Option (provided, however, that the Holder of record of such Securities on the record date immediately preceding such Option Purchase Date need not surrender
such Securities in order to be entitled to receive, on the Option Purchase Date, the accrued and unpaid interest due thereon). 
 If such
Securities are held in book-entry form through the Depositary, the Purchase Notice shall comply with applicable procedures of the Depositary. 
 Upon such delivery of Securities to the Company (if it is acting as its own Paying Agent) or such Paying Agent, such Holder shall be entitled to receive from the Company or such Paying Agent, as the case may be, a nontransferable receipt of
deposit evidencing such delivery. 
 Notwithstanding anything herein to the contrary, any Holder that has delivered the Purchase Notice
contemplated by this Section 3.08(A) to the Company (if it is acting as its own Paying Agent) or to a Paying Agent designated by the Company for such purpose in the Option Purchase Notice shall have the right to withdraw such Purchase
Notice by delivery, at any time prior to the close of business on the Business Day immediately preceding the applicable Option Purchase Date, of a written notice of withdrawal to the Company (if acting as its own Paying Agent) or the Paying Agent,
which notice shall contain the information specified in Section 3.08(B)(vii). 
 The Paying Agent shall promptly notify the
Company of the receipt by it of any Purchase Notice or written notice of withdrawal thereof. 
 (B) The Company shall deliver, or cause to be
delivered, written notice (the “Option Purchase Notice”) on a date not less than twenty (20) Business Days prior to each Option Purchase Date to each Holder at its address shown in the register of the Registrar. Such notice
shall state: 
 (i) the Option Purchase Price plus accrued and unpaid interest, if any, to, but excluding, such Option
Purchase Date and the Conversion Rate; 
 (ii) the names and addresses of the Paying Agent and the Conversion Agent;

 (iii) that Securities with respect to which a Purchase Notice is given by a Holder may be converted pursuant to Article
X only if such Purchase Notice has been withdrawn in accordance with this Section 3.08 or if there shall be a Default in the payment of such Option Purchase Price or in accrued and unpaid interest, if any, payable as herein provided
upon Purchase at Holder’s Option; 
 (iv) that Securities must be surrendered to the Paying Agent to collect payment of
the Option Purchase Price plus (if such Holder was the Holder of record of the applicable Security at the close of business on the record date immediately preceding the Option Purchase Date) accrued and unpaid interest, if any, payable as herein
provided upon Purchase at Holder’s Option; 
  

 -21- 

 (v) that the Option Purchase Price, plus accrued and unpaid interest, if any, to, but
excluding, such Option Purchase Date, for any Security as to which a Purchase Notice has been given and not withdrawn will be paid as promptly as practicable, but in no event later than the later of such Option Purchase Date or the time of delivery
of the Security as described in clause (iv) above; provided, however, that such accrued and unpaid interest shall be paid, on the applicable interest payment date, to the Holder of record of such Security at the close of
business on the record date immediately preceding such Option Purchase Date; 
 (vi) the procedures the Holder must follow to
exercise rights under this Section 3.08 (including the name and address of the Paying Agent) and a brief description of those rights; 
 (vii) that a Holder will be entitled to withdraw its election in the Purchase Notice if the Company (if acting as its own Paying Agent) or the Paying Agent receives, at any time prior to the close of business on the
Business Day immediately preceding the applicable Option Purchase Date, or such longer period as may be required by law, a letter or telegram, telex or facsimile transmission (receipt of which is confirmed and promptly followed by a letter) setting
forth (I) the name of such Holder, (II) a statement that such Holder is withdrawing its election to have Securities purchased by the Company on such Option Purchase Date pursuant to a Purchase at Holder’s Option, (III) the certificate
number(s) of such Securities to be so withdrawn, if such Securities are in certificated form, (IV) the principal amount of the Securities of such Holder to be so withdrawn, which amount must be $1,000 or an integral multiple thereof and (V) the
principal amount, if any, of the Securities of such Holder that remain subject to the Purchase Notice delivered by such Holder in accordance with this Section 3.08, which amount must be $1,000 or an integral multiple thereof; 

(viii) that, except as otherwise provided herein, on and after the applicable Option Purchase Date (unless there shall be a Default in
the payment of the consideration payable as herein provided upon a Purchase at Holder’s Option), interest on Securities subject to Purchase at Holder’s Option will cease to accrue, and all rights of the Holders of such Securities shall
terminate, other than the right to receive, in accordance herewith, the consideration payable as herein provided upon a Purchase at Holder’s Option; and 
 (ix) the CUSIP number or numbers, as the case may be, of the Securities. 
 At the Company’s request, upon reasonable prior notice, the Trustee shall deliver such Option Purchase Notice in the Company’s name and at the
Company’s expense; provided, however, that the form and content of such Option Purchase Notice shall be prepared by the Company. 
  

 -22- 

 No failure of the Company to give an Option Purchase Notice shall limit any Holder’s right to
exercise its rights to require the Company to purchase such Holder’s Securities pursuant to a Purchase at Holder’s Option. 
 (C)
Subject to the provisions of this Section 3.08, the Company shall pay, or cause to be paid, the Option Purchase Price, plus accrued and unpaid interest, if any, to, but excluding, the applicable Option Purchase Date, with respect to each
Security subject to Purchase at Holder’s Option to the Holder thereof as promptly as practicable, but in no event later than the later of the applicable Option Purchase Date and the time such Security (together with all necessary endorsements)
is surrendered to the Paying Agent; provided, however, that such accrued and unpaid interest shall be paid, on the applicable interest payment date, to the Holder of record of such Security at the close of business on the record date
immediately preceding such Option Purchase Date. 
 (D) Prior to 11:00 A.M., New York City time on the applicable Option Purchase Date, the
Company shall deposit with a Paying Agent (or, if the Company is acting as its own Paying Agent, segregate and hold in trust in accordance with Section 2.04) money, in funds immediately available on the applicable Option Purchase Date,
sufficient to pay the Option Purchase Price, plus accrued and unpaid interest, if any, to, but excluding, such Option Purchase Date, of all of the Securities that are to be purchased by the Company on such Option Purchase Date pursuant to a Purchase
at Holder’s Option. The Paying Agent shall return to the Company, as soon as practicable, any money not required for that purpose. 
 (E) Once the Purchase Notice has been duly delivered in accordance with this Section 3.08, the Securities to be purchased pursuant to the Purchase at Holder’s Option shall, on the applicable Option Purchase Date, become due
and payable in accordance herewith, and, on and after such date (unless there shall be a Default in the payment of the consideration payable as herein provided upon a Purchase at Holder’s Option), except as otherwise herein provided, such
Securities shall cease to bear interest, and all rights of the Holders of such Securities shall terminate, other than the right to receive, in accordance herewith, the such consideration. 
 (F) Securities with respect to which a Purchase Notice has been duly delivered in accordance with this Section 3.08 may be converted pursuant
to Article X, if otherwise convertible in accordance with Article X, only if such Purchase Notice has been withdrawn in accordance with this Section 3.08 or if there shall be a Default in the payment of the consideration
payable as herein provided upon a Purchase at Holder’s Option. 
 (G) If any Security subject to Purchase at Holder’s Option shall
not be paid in accordance herewith, the principal of, and accrued and unpaid interest on, such Security shall, until paid, bear interest, payable in cash, at the rate borne by such Security on the principal amount of such Security, and such Security
shall continue to be convertible pursuant to Article X. 
 (H) Any Security which is to be submitted for Purchase at Holder’s
Option only in part shall be delivered pursuant to this Section 3.08 (with, if the Company or the Trustee so requires, due endorsement by, or a written instrument of transfer in form satisfactory to the Company and the Trustee duly
executed by, the Holder thereof or its attorney duly authorized in writing), and the 

  

 -23- 

 
Company shall execute, and the Trustee shall authenticate and make available for delivery to the Holder of such Security without service charge, a new
Security or Securities, of any authorized denomination as requested by such Holder, of the same tenor and in aggregate principal amount equal to the portion of such Security not submitted for Purchase at Holder’s Option. 
 (I) Notwithstanding anything herein to the contrary, there shall be no purchase of any Securities pursuant to this Section 3.08 if the
principal amount of the Securities has been accelerated pursuant to Section 6.02 and such acceleration shall not have been rescinded on or before the applicable Option Purchase Date. The Paying Agent will promptly return to the
respective Holders thereof any Securities tendered to it for Purchase at Holder’s Option during the continuance of such an acceleration. 
 (J) Notwithstanding anything herein to the contrary, if the option granted to Holders to require the purchase of the Securities on the applicable Option Purchase Date is determined to constitute a tender offer, the Company shall comply with
all applicable tender offer rules under the Exchange Act, including Rule 13e-4 and Regulation 14E thereunder, and with all other applicable laws, and will file a Schedule TO or any other schedules required under the Exchange Act or any other
applicable laws. 
 3.09 REPURCHASE AT OPTION OF HOLDER UPON
A FUNDAMENTAL CHANGE. 
 (A) In the event any Fundamental Change (as defined below) shall
occur, each Holder of Securities shall have the right (the “Fundamental Change Repurchase Right”), at such Holder’s option, to require the Company to repurchase all of such Holder’s Securities (or portions thereof that are
integral multiples of $1,000 in principal amount), on a date selected by the Company (the “Fundamental Change Repurchase Date”), which Fundamental Change Repurchase Date shall be no later than thirty five (35) days, nor earlier
than twenty (20) days, after the date the Fundamental Change Notice (as defined below) is delivered in accordance with Section 3.09(B), at a price, payable in cash, equal to one hundred percent (100%) of the principal amount of
the Securities (or portions thereof) to be so repurchased (the “Fundamental Change Repurchase Price”), plus accrued and unpaid interest, if any, to, but excluding, the Fundamental Change Repurchase Date, upon: 
 (i) delivery to the Company (if it is acting as its own Paying Agent), or to a Paying Agent designated by the Company for such purpose in
the Fundamental Change Notice, no later than the close of business on the third Business Day immediately preceding the Fundamental Change Repurchase Date, of a Purchase Notice, in the form set forth in the Securities or any other form of written
notice substantially similar thereto, in each case, duly completed and signed, with appropriate signature guarantee, stating: 
 (a) the certificate number(s) of the Securities which the Holder will deliver to be repurchased, if such Securities are in certificated form; 
 (b) the principal amount of Securities to be repurchased, which must be $1,000 or an integral multiple thereof; and 
  

 -24- 

 (c) that such principal amount of Securities are to be repurchased pursuant to the terms
and conditions specified in paragraph 9 of the Securities and in this Indenture; and 
 (ii) delivery to the Company
(if it is acting as its own Paying Agent), or to a Paying Agent designated by the Company for such purpose in the Fundamental Change Notice, at any time after the delivery of such Purchase Notice, of such Securities (together with all necessary
endorsements) with respect to which the Fundamental Change Repurchase Right is being exercised; 
 provided, however, that if such Fundamental
Change Repurchase Date is after a record date for the payment of an installment of interest and on or before the related interest payment date, then the accrued and unpaid interest, if any, to, but excluding, such interest payment date will be paid
on such interest payment date to the Holder of record of such Securities at the close of business on such record date (without any surrender of such Securities by such Holder), and the Holder surrendering such Securities for repurchase will not be
entitled to any such accrued and unpaid interest unless such Holder was also the Holder of record of such Securities at the close of business on such record date. 
 If such Securities are held in book-entry form through the Depositary, the Purchase Notice shall comply with applicable procedures of the Depositary. 
 If such Securities are in certificated form, upon delivery of certificated Securities to the Company (if it is acting as its own Paying Agent) or such
Paying Agent, such Holder shall be entitled to receive from the Company or such Paying Agent, as the case may be, a nontransferable receipt of deposit evidencing such delivery. 
 Notwithstanding anything herein to the contrary, any Holder that has delivered the Purchase Notice contemplated by this Section 3.09(A) to
the Company (if it is acting as its own Paying Agent) or to a Paying Agent designated by the Company for such purpose in the Fundamental Change Notice shall have the right to withdraw such Purchase Notice by delivery, at any time prior to the close
of business on the Business Day immediately preceding the Fundamental Change Repurchase Date, of a written notice of withdrawal to the Company (if acting as its own Paying Agent) or the Paying Agent, which notice shall contain the information
specified in Section 3.09(B)(xi). 
 The Paying Agent shall promptly notify the Company of the receipt by it of any Purchase
Notice or written notice of withdrawal thereof. 
 (B) Within twenty (20) Business Days after the occurrence of a Fundamental Change,
the Company shall deliver, or cause to be delivered, to all Holders of record of the Securities at their addresses shown in the register of the Registrar a notice (the “Fundamental Change Notice”) of the occurrence of such
Fundamental Change and the Fundamental Change Repurchase Right arising as a result thereof. The Company shall deliver a copy of the Fundamental Change Notice to the Trustee and shall publicly release, through a reputable national newswire service,
such Fundamental Change Notice. 
 Each Fundamental Change Notice shall state: 
 (i) the events causing the Fundamental Change; 
  

 -25- 

 (ii) the date of such Fundamental Change; 
 (iii) the Fundamental Change Repurchase Date; 
 (iv) the date by which the Fundamental Change Repurchase Right must be exercised; 
 (v) the Fundamental Change Repurchase Price plus accrued and unpaid interest, if any, to, but excluding, the Fundamental Change Repurchase
Date; 
 (vi) the names and addresses of the Paying Agent and the Conversion Agent; 
 (vii) a description of the procedures which a Holder must follow to exercise the Fundamental Change Repurchase Right; 
 (viii) that, in order to exercise the Fundamental Change Repurchase Right, the Securities must be surrendered for payment of the
Fundamental Change Repurchase Price plus accrued and unpaid interest, if any, payable as herein provided upon Repurchase Upon Fundamental Change; 
 (ix) that the Fundamental Change Repurchase Price, plus accrued and unpaid interest, if any, to, but excluding, the Fundamental Change Repurchase Date, for any Security as to which a Purchase Notice has been given and
not validly withdrawn will be paid as promptly as practicable, but in no event later than the later of such Fundamental Change Repurchase Date and the third Business Day after the time of delivery of the Security (together with all necessary
endorsements) as described in clause (viii) above; provided, however, that if such Fundamental Change Repurchase Date is after a record date for the payment of an installment of interest and on or before the related
interest payment date, then the accrued and unpaid interest, if any, to, but excluding, such interest payment date will be paid on such interest payment date to the Holder of record of such Security at the close of business on such record date
(without any surrender of such Securities by such Holder), and the Holder surrendering such Security for repurchase will not be entitled to any such accrued and unpaid interest unless such Holder was also the Holder of record of such Security at the
close of business on such record date; 
 (x) that, except as otherwise provided herein, on and after such Fundamental Change
Repurchase Date (unless there shall be a Default in the payment of the consideration payable as herein provided upon Repurchase Upon Fundamental Change), interest on Securities subject to Repurchase Upon Fundamental Change will cease to accrue, and
all rights of the Holders of such Securities shall terminate, other than the right to receive, in accordance herewith, the consideration payable as herein provided upon Repurchase Upon Fundamental Change; 
  

 -26- 

 (xi) that a Holder will be entitled to withdraw its election in the Purchase Notice if
the Company (if acting as its own Paying Agent), or the Paying Agent receives, prior to the close of business on the Business Day immediately preceding the Fundamental Change Repurchase Date, or such longer period as may be required by law, a letter
or telegram, telex or facsimile transmission (receipt of which is confirmed and promptly followed by a letter) setting forth (I) the name of such Holder, (II) a statement that such Holder is withdrawing its election to have Securities purchased
by the Company on such Fundamental Change Repurchase Date pursuant to a Repurchase Upon Fundamental Change, (III) the certificate number(s) of such Securities to be so withdrawn, if such Securities are in certificated form, (IV) the principal amount
of the Securities of such Holder to be so withdrawn, which amount must be $1,000 or an integral multiple thereof and (V) the principal amount, if any, of the Securities of such Holder that remain subject to the Purchase Notice delivered by such
Holder in accordance with this Section 3.09, which amount must be $1,000 or an integral multiple thereof; 
 (xii)
the Conversion Rate and any adjustments to the Conversion Rate that will result from such Fundamental Change; 
 (xiii) that
Securities with respect to which a Purchase Notice is given by a Holder may be converted pursuant to Article X only if such Purchase Notice has been withdrawn in accordance with this Section 3.09 or if there shall be a Default in
the payment of the Fundamental Change Repurchase Price or in the accrued and unpaid interest, if any, payable as herein provided upon Repurchase Upon Fundamental Change; and 
 (xiv) the CUSIP number or numbers, as the case may be, of the Securities. 
 At the Company’s request, upon reasonable prior notice, the Trustee shall deliver such Fundamental Change Notice in the Company’s name and at
the Company’s expense; provided, however, that the form and content of such Fundamental Change Notice shall be prepared by the Company. 
 No failure of the Company to give a Fundamental Change Notice shall limit any Holder’s right to exercise a Fundamental Change Repurchase Right. 
 (C) Subject to the provisions of this Section 3.09, the Company shall pay, or cause to be paid, the Fundamental Change Repurchase Price, plus accrued and unpaid interest, if any, to, but excluding, the
Fundamental Change Repurchase Date, with respect to each Security as to which the Fundamental Change Repurchase Right shall have been exercised to the Holder thereof as promptly as practicable, but in no event later than the later of the Fundamental
Change Repurchase Date and the third Business Day after the time such Security is surrendered to the Paying Agent; provided, however, that if such Fundamental Change Repurchase Date is after a record date for the payment of an
installment of interest and on or before the related interest payment date, then the accrued and unpaid interest, if any, to, but excluding, such interest payment date will be paid on such interest payment date to the Holder of record of such
Security at the close of business on such record date, and the Holder surrendering such Security for repurchase will not be entitled to any such accrued and unpaid interest unless such Holder was also the Holder of record of such Security at the
close of business on such record date. 
  

 -27- 

 (D) Prior to 11:00 A.M., New York City time on a Fundamental Change Repurchase Date, the Company shall
deposit with a Paying Agent (or, if the Company is acting as its own Paying Agent, segregate and hold in trust in accordance with Section 2.04) money, in funds immediately available on the Fundamental Change Repurchase Date, sufficient
to pay the consideration payable as herein provided upon Repurchase Upon Fundamental Change for all of the Securities that are to be repurchased by the Company on such Fundamental Change Repurchase Date pursuant to a Repurchase Upon Fundamental
Change. The Paying Agent shall return to the Company, as soon as practicable, any money not required for that purpose. 
 (E) Once the
Fundamental Change Notice and the Purchase Notice have been duly given in accordance with this Section 3.09, the Securities to be repurchased pursuant to a Repurchase Upon Fundamental Change shall, on the Fundamental Change Repurchase
Date, become due and payable in accordance herewith, and, on and after such date (unless there shall be a Default in the payment of the consideration payable as herein provided upon Repurchase Upon Fundamental Change), except as otherwise herein
provided, such Securities shall cease to bear interest, and all rights of the Holders of such Securities shall terminate, other than the right to receive, in accordance herewith, such consideration. 
 (F) Securities with respect to which a Purchase Notice has been duly delivered in accordance with this Section 3.09 may be converted pursuant
to Article X, if otherwise convertible in accordance with Article X, only if such Purchase Notice has been withdrawn in accordance with this Section 3.09 or if there shall be a Default in the payment of the consideration
payable as herein provided upon Repurchase Upon Fundamental Change. 
 (G) If any Security shall not be paid upon surrender thereof for
Repurchase Upon Fundamental Change, the principal of, and accrued and unpaid interest on, such Security shall, until paid, bear interest, payable in cash, at the rate borne by such Security on the principal amount of such Security, and such Security
shall continue to be convertible pursuant to Article X. 
 (H) Any Security which is to be submitted for Repurchase Upon Fundamental
Change only in part shall be delivered pursuant to this Section 3.09 (with, if the Company or the Trustee so requires, due endorsement by, or a written instrument of transfer in form satisfactory to the Company and the Trustee duly
executed by, the Holder thereof or its attorney duly authorized in writing), and the Company shall execute, and the Trustee shall authenticate and make available for delivery to the Holder of such Security without service charge, a new Security or
Securities, of any authorized denomination as requested by such Holder, of the same tenor and in aggregate principal amount equal to the portion of such Security not duly submitted for Repurchase Upon Fundamental Change. 
 (I) Notwithstanding anything herein to the contrary, there shall be no purchase of any Securities pursuant to this Section 3.09 on a
Fundamental Change Repurchase Date if, on or prior to such date, the principal amount of the Securities has been accelerated pursuant to Section 6.02 and such acceleration shall not have been rescinded on or before the applicable
Fundamental Change 

  

 -28- 

 
Repurchase Date. The Paying Agent will promptly return to the respective Holders thereof any Securities tendered to it for Repurchase Upon Fundamental Change
during the continuance of such an acceleration. 
 (J) Notwithstanding anything herein to the contrary, if the option granted to Holders to
require the repurchase of the Securities upon the occurrence of a Fundamental Change is determined to constitute a tender offer, the Company shall comply with all applicable tender offer rules under the Exchange Act, including Rule 13e-4 and
Regulation 14E thereunder, and with all other applicable laws, and will file a Schedule TO or any other schedules required under the Exchange Act or any other applicable laws. 
 (K) As used herein and in the Securities, a “Fundamental Change” shall be deemed to have occurred upon the occurrence of either a
“Change in Control” or a “Termination of Trading.” 
 (i) A “Change in Control” shall be
deemed to have occurred at such time as: 
 (a) any “person” or “group” (as such terms are used in
Sections 13(d) and 14(d) of the Exchange Act) is or becomes the “beneficial owner” (as such term is used in Rule 13d-3 under the Exchange Act), directly or indirectly, of fifty percent (50%) or more of the total outstanding voting
power of all classes of the Company’s Capital Stock entitled to vote generally in the election of directors (such an event, an “Acquisition of Voting Control”); or 
 (b) there occurs a sale, transfer, lease, conveyance or other disposition of all or substantially all of the property or assets of the
Company, or of the Company and the Subsidiaries on a consolidated basis, to any “person” or “group” (as such terms are used in Sections 13(d) and 14(d) of the Exchange Act), including any group acting for the purpose of
acquiring, holding, voting or disposing of securities within the meaning of Rule 13d-5(b)(1) under the Exchange Act; or 
 (c)
the Company consolidates with, or merges with or into, another person or any person consolidates with, or merges with or into, the Company, unless either: 
 (1) the persons that “beneficially owned” (as such term is used in Rule 13d-3 under the Exchange Act), directly or indirectly, the shares of the Company’s Voting Stock immediately prior to such
consolidation or merger, “beneficially own,” directly or indirectly, immediately after such consolidation or merger, shares of the surviving or continuing corporation’s Voting Stock representing at least a majority of the total
outstanding voting power of all outstanding classes of the Voting Stock of the surviving or continuing corporation in substantially the same proportion as such ownership immediately prior to such consolidation or merger; or 
  

 -29- 

 (2) at least ninety percent (90%) of the consideration (other than cash payments
for fractional shares or pursuant to statutory appraisal rights) in such consolidation or merger consists of common stock and any associated rights traded on a U.S. national securities exchange (or which will be so traded when issued or exchanged in
connection with such consolidation or merger), and, as a result of such consolidation or merger, the Securities become convertible solely into such common stock and associated rights (such a consolidation or merger that satisfies the conditions set
forth in this clause (2), a “Listed Stock Business Combination”); or 
 (d) the following persons
cease for any reason to constitute a majority of the Company’s Board of Directors: 
 (1) individuals who on the Issue
Date constituted the Company’s Board of Directors, which shall be deemed to include any new directors joining the Company’s Board of Directors as a result of Company’s contemplated merger with Celunol Corp., as described in the
Company’s Current Report on Form 8-K filed with the SEC on February 12, 2007 (the “Celunol Merger”); and 
 (2) any new directors whose election to the Company’s Board of Directors or whose nomination for election by the Company’s stockholders was approved by at least a majority of the directors of the Company then still in office
either who were directors of the Company on the Issue Date or whose election or nomination for election was previously so approved; or 
 (e) the Company is liquidated or dissolved or the holders of the Company’s Capital Stock approve any plan or proposal for the liquidation or dissolution of the Company. 
 Notwithstanding anything herein or in the Securities to the contrary, the Celunol Merger shall not constitute a “Change in Control.” 

(ii) A “Termination of Trading” shall occur if the Common Stock of the Company (or other common stock into which the
Securities are then convertible) is no longer listed for trading on a U.S. national securities exchange. 
 IV. COVENANTS 

4.01 PAYMENT OF SECURITIES. 
 The Company shall pay all amounts due with respect to the Securities on the dates and in the manner provided in the Securities and in this Indenture. All such amounts shall be considered paid on the date due if the
Paying Agent holds (or, if the Company is acting as Paying Agent, the Company has segregated and holds in trust in accordance with Section 2.04) on that date money 

  

 -30- 

 
sufficient to pay the amount then due with respect to the Securities (unless there shall be a Default in the payment of such amounts to the respective
Holder(s)). The Company will pay, in money of the United States that at the time of payment is legal tender for payment of public and private debts, all amounts due in cash with respect to the Securities, which amounts shall be paid (A) in the
case of a Security that is in global form, by wire transfer of immediately available funds to the account designated by the Depositary or its nominee; (B) in the case of a Security that is held, other than global form, by a Holder of more than
five million dollars ($5,000,000) in aggregate principal amount of Securities, by wire transfer of immediately available funds to the account specified by such Holder or, if such Holder does not specify an account, by mailing a check to the address
of such Holder set forth in the register of the Registrar; and (C) in the case of a Security that is held, other than global form, by a Holder of five million dollars ($5,000,000) or less in aggregate principal amount of Securities, by mailing
a check to the address of such Holder set forth in the register of the Registrar. 
 The Company shall pay, in cash, interest on any overdue
amount (including, to the extent permitted by applicable law, overdue interest) at the rate borne by the Securities. 
 4.02 MAINTENANCE
OF OFFICE OR AGENCY. 
 The Company will maintain, or cause to be maintained,
in the United States an office or agency (which may be an office of the Trustee or an affiliate of the Trustee, Registrar or co-Registrar) where Securities may be surrendered for registration of transfer or exchange, payment or conversion and where
notices and demands to or upon the Company in respect of the Securities 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, notices and demands may be made or served at the Corporate Trust Office of the
Trustee. 
 The Company may also from time to time designate one or more other offices or agencies where the Securities may be presented or
surrendered for any or all such purposes and may from time to time rescind such designations; provided, however, that no such designation or rescission shall in any manner relieve the Company of its obligation to maintain an office or
agency in the United States 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 Company hereby designates the Corporate Trust Office of the Trustee as an agency of the Company in accordance with Section 2.03.

 4.03 RULE 144A INFORMATION AND ANNUAL REPORTS. 
 (A) At any time when the Company is not subject to, or is in violation of, Sections 13 or 15(d) of the Exchange Act, the Company shall promptly provide to
the Trustee and shall, upon request, provide to any Holder or prospective purchaser of Securities or shares of Common Stock issued upon conversion of any Securities, the information required to be delivered pursuant to Rule 144A(d)(4) under the
Securities Act to facilitate the resale of such Securities or shares of Common Stock pursuant to Rule 144A. The 

  

 -31- 

 
Company shall take such further action as any Holder or beneficial holder of such Securities or shares of Common Stock may reasonably request to the extent
required from time to time to enable such Holder or beneficial holder to sell its Securities or shares of Common Stock in accordance with Rule 144A, as such rule may be amended from time to time. 
 (B) The Company shall deliver to the Trustee, no later than the time such report is required to be filed with the SEC pursuant to the Exchange Act
(including, without limitation, to the extent applicable, any extension permitted by Rule 12b-25 under the Exchange Act), a copy of each report the Company is required to file with the SEC pursuant to Section 13 or 15(d) of the Exchange Act;
provided, however, that the Company shall not be required to deliver to the Trustee any material for which the Company has sought and received confidential treatment by the SEC; provided further, each such report will be deemed to be
so delivered to the Trustee if the Company files such report with the SEC through the SEC’s EDGAR database no later than the time such report is required to be filed with the SEC pursuant to the Exchange Act (including, without limitation, to
the extent applicable, any extension permitted by Rule 12b-25 under the Exchange Act). In the event the Company is at any time while any Securities are outstanding no longer subject to the reporting requirements of Section 13 or
Section 15(d) of the Exchange Act, the Company shall continue to provide to the Trustee and, upon request, to each Holder, no later than the date the Company would have been required to file the same with the SEC, the reports the Company would
have been required to file with the SEC pursuant to Section 13 or 15(d) of the Exchange if the Company were subject to the reporting requirements of such sections. The Company also shall comply with the other provisions of TIA § 314(a).
Delivery of such reports, information and documents to the Trustee is for informational purposes only, and the Trustee’s receipt thereof shall not constitute constructive notice of any information contained therein or determinable from
information contained therein, including the Company’s compliance with any of its covenants hereunder (as to which the Trustee is entitled to rely exclusively on Officer’s Certificates). 
  

	4.04	Compliance Certificate. 

 The Company shall deliver to the
Trustee, within ninety (90) calendar days after the end of each fiscal year of the Company, an Officer’s Certificate stating whether or not the signatory to such Officer’s Certificate knows of any Default or Event of Default by the
Company in performing any of its obligations under this Indenture or the Securities. If such signatory does know of any such Default or Event of Default, then such Officer’s Certificate shall describe the Default or Event of Default and its
status. 
  

	4.05	Stay, Extension and Usury Laws. 

 The Company covenants
(to the extent that it may lawfully do so) that it will 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 wherever enacted, now or at any time hereafter in
force, which may affect the covenants or the performance of this Indenture; and the Company (in each case, to the extent that 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 has been enacted. 
  

 -32- 

 4.06 CORPORATE EXISTENCE. 
 Subject to Article V, the Company will do or cause to be done all things necessary to preserve and keep in full force and effect its corporate
existence and the corporate existence of each of its Subsidiaries, in accordance with the respective organizational documents of the Company and of each Subsidiary, and the rights (charter and statutory), licenses and franchises of the Company and
its Subsidiaries; provided, however, that the Company shall not be required to preserve any such right, license or franchise, or the corporate existence of any Subsidiary, if in the good faith judgment of the Board of Directors
(i) such preservation or existence is not material to the conduct of business of the Company and (ii) the loss of such right, license or franchise or the dissolution of such Subsidiary does not have a material adverse impact on the
Holders. 
 4.07 NOTICE OF DEFAULT. 
 Upon the Company becoming aware of the occurrence of any Default or Event of Default, the Company shall give prompt written notice to the Trustee of such
Default or Event of Default, and any remedial action proposed to be taken. 
 4.08 FURTHER INSTRUMENTS AND
ACTS. 
 Upon request of the Trustee, the Company shall 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. 
 4.09 ADDITIONAL
INTEREST NOTICE. 
 In the event that the Company is required to pay additional interest to holders of
Securities pursuant to the Registration Rights Agreement, the Company will provide written notice (“Additional Interest Notice”) to the Trustee of its obligation to pay additional interest no later than fifteen (15) calendar days
prior to the proposed payment date for the additional interest (or, if the applicable Event (as defined in the Registration Rights Agreement) giving rise to the obligation to pay such additional interest occurs on or after the fifteenth
(15th) calendar day before such payment date, no later than the Business Day after the date such Event occurs). Each Additional Interest Notice shall set forth the amount of Additional Interest to be paid by the Company on such payment date.
The Trustee shall not at any time be under any duty or responsibility to any Holder to determine the amount of additional interest, or with respect to the nature, extent or calculation of the amount of additional interest owed, or with respect to
the method employed in such calculation of the additional interest. 
  

 -33- 

 V. SUCCESSORS 
 5.01 WHEN COMPANY MAY MERGE, ETC. 
 The Company
shall not consolidate with, or merge with or into, or sell, transfer, lease, convey or otherwise dispose of all or substantially all of the property or assets of the Company, or of the Company and the Subsidiaries on a consolidated basis, to,
another person, whether in a single transaction or series of related transactions, unless (i) if the surviving person is not the Company, the surviving person is a corporation organized and existing under the laws of the United States, any
State thereof or the District of Columbia; (ii) such person assumes by supplemental indenture all the obligations of the Company under the Securities and this Indenture; and (iii) immediately after giving effect to such transaction or
series of transactions, no Default or Event of Default shall exist. 
 The Company shall deliver to the Trustee prior to the consummation of
the proposed transaction an Officer’s Certificate to the foregoing effect and an Opinion of Counsel (which may rely upon such Officer’s Certificate as to the absence of Defaults and Events of Default) stating that the proposed transaction
and such supplemental indenture will, upon consummation of the proposed transaction, comply with this Indenture. 
 5.02 SUCCESSOR
SUBSTITUTED. 
 Upon any consolidation, merger or any sale, transfer, lease, conveyance or other disposition of all or
substantially all of the property or assets of the Company, or of the Company and the Subsidiaries on a consolidated basis, the successor person formed by such consolidation or into which the Company is merged or to which such sale, transfer, lease,
conveyance or other disposition is made shall succeed to, and, except in the case of a lease, be substituted for, and may exercise every right and power of, and shall assume every duty and obligation of, the Company under this Indenture with the
same effect as if such successor had been named as the Company herein. When the successor assumes all obligations of the Company hereunder, except in the case of a lease, all obligations of the predecessor shall terminate. 
 VI. DEFAULTS AND REMEDIES 
 6.01
EVENTS OF DEFAULT. 
 An “Event of Default” occurs if: 
 (i) the Company fails to pay the principal of, or premium, if any, on, any Security when the same becomes due and payable, whether at
maturity, upon Redemption, on an Option Purchase Date with respect to a Purchase at Holder’s Option, on a Fundamental Change Repurchase Date with respect to a Repurchase Upon Fundamental Change or otherwise; 
 (ii) the Company fails to pay an installment of interest or additional interest on any Security when due, if such failure continues for
thirty (30) days after the date when due; 
  

 -34- 

 (iii) the Company fails to satisfy its conversion obligations upon exercise of a
Holder’s conversion rights pursuant hereto; 
 (iv) the Company fails to timely provide a Fundamental Change Notice or an
Option Purchase Notice, as required by the provisions of this Indenture, or fails to timely provide any notice pursuant to, and in accordance with, Section 10.16(E); 
 (v) the Company fails to comply with any other term, covenant or agreement set forth in the Securities or this Indenture and such failure
continues for the period, and after the notice, specified below; 
 (vi) the Company or any of its Subsidiaries defaults in
the payment when due, after the expiration of any applicable grace period, of principal of, or premium, if any, or interest on, Indebtedness for money borrowed, in the aggregate principal amount then outstanding of fifteen million dollars
($15,000,000) or more, or the acceleration of Indebtedness of the Company or any of its Subsidiaries for money borrowed in such aggregate principal amount or more so that it becomes due and payable prior to the date on which it would otherwise
become due and payable and such default is not cured or waived, or such acceleration is not rescinded, within sixty (60) days after notice to the Company by the Trustee or to the Company and the Trustee by Holders of at least twenty five
percent (25%) in aggregate principal amount of the Securities then outstanding, each in accordance with this Indenture; 
 (vii) the Company or any of its Subsidiaries fails to pay, bond or otherwise discharge any final, non-appealable judgments, the aggregate uninsured portion of which is at least fifteen million dollars ($15,000,000), and such judgments are
not paid, stayed or discharged within sixty (60) days; 
 (viii) the Company or any of its Significant Subsidiaries or
any group of Subsidiaries that in the aggregate would constitute a Significant Subsidiary of the Company, pursuant to, or within the meaning of, any Bankruptcy Law, insolvency law, or other similar law now or hereafter in effect or otherwise,
either: 
 (A) commences a voluntary case, 
 (B) consents to the entry of an order for relief against it in an involuntary case, 
 (C) consents to the appointment of a Custodian of it or for all or substantially all of its property, or 
 (D) makes a general assignment for the benefit of its creditors; or 
 (ix) a court of competent jurisdiction enters an order or decree under any Bankruptcy Law that: 
 (A) is for relief against the Company or any of its Significant Subsidiaries or any group of Subsidiaries that in the aggregate would
constitute a Significant Subsidiary of the Company in an involuntary case or proceeding, or adjudicates 

  

 -35- 

 
the Company or any of its Significant Subsidiaries or any group of Subsidiaries that in the aggregate would constitute a Significant Subsidiary of the
Company insolvent or bankrupt, 
 (B) appoints a Custodian of the Company or any of its Significant Subsidiaries or any group
of Subsidiaries that in the aggregate would constitute a Significant Subsidiary of the Company for all or substantially all of the property of the Company or any such Significant Subsidiary or any group of Subsidiaries that in the aggregate would
constitute a Significant Subsidiary of the Company, as the case may be, or 
 (C) orders the winding up or liquidation of the
Company or any of its Significant Subsidiaries or any group of Subsidiaries that in the aggregate would constitute a Significant Subsidiary of the Company, 
 and, in the case of each of the foregoing clauses (A), (B) and (C) of this Section 6.01(ix), the order or decree remains unstayed and in effect for at least ninety (90) consecutive days.

 The term “Bankruptcy Law” means Title 11, U.S. Code or any similar Federal or State law for the relief of debtors. The
term “Custodian” means any receiver, trustee, assignee, liquidator or similar official under any Bankruptcy Law. 
 A
Default under clause (v) above is not an Event of Default until (I) the Trustee notifies the Company, or the Holders of at least twenty five percent (25%) in aggregate principal amount of the Securities then outstanding notify
the Company and the Trustee, of the Default and (II) the Default is not cured within sixty (60) days after receipt of such notice. Such notice must specify the Default, demand that it be remedied and state that the notice is a “Notice
of Default.” If the Holders of at least twenty five percent (25%) in aggregate principal amount of the outstanding Securities request the Trustee to give such notice on their behalf, the Trustee shall do so. When a Default is cured, it
ceases. 
 6.02 ACCELERATION. 
 If an Event of Default (excluding an Event of Default specified in Section 6.01(viii) or (ix) with respect to the Company (but including an Event of Default specified in Section 6.01(viii) or
(ix) solely with respect to a Significant Subsidiary of the Company or any group of Subsidiaries that in the aggregate would constitute a Significant Subsidiary of the Company)) occurs and is continuing, the Trustee by written notice to the
Company, or the Holders of at least twenty five percent (25%) in aggregate principal amount of the Securities then outstanding by written notice to the Company and the Trustee, may declare the Securities to be immediately due and payable in
full. Upon such declaration, the principal of, and any accrued and unpaid interest (including any additional interest) on, all Securities shall be due and payable immediately. If an Event of Default specified in Section 6.01(viii) or
(ix) with respect to the Company (excluding, for purposes of this sentence, an Event of Default specified in Section 6.01(viii) or (ix) solely with respect to a Significant Subsidiary of the Company or any group of
Subsidiaries that in the aggregate would constitute a Significant Subsidiary of 

  

 -36- 

 
the Company) occurs, the principal of, and accrued and unpaid interest (including any additional interest) on, all the Securities shall ipso facto
become and be immediately due and payable without any declaration or other act on the part of the Trustee or any Holder. The Holders of a majority in aggregate principal amount of the Securities then outstanding by written notice to the Trustee
may rescind or annul an acceleration and its consequences if (A) the rescission would not conflict with any order or decree, (B) all existing Events of Default, except the nonpayment of principal or interest (including additional interest)
that has become due solely because of the acceleration, have been cured or waived and (C) all amounts due to the Trustee under Section 7.07 have been paid. 
 Notwithstanding the foregoing, at the election of the Company, the sole remedy for an Event of Default specified in Section 6.01(v) relating
to the failure by the Company to comply with its obligations under Section 4.03 and for any failure by the Company to comply with the requirements of Section 314(a)(1) of the Trust Indenture Act, shall for the first 60 days after
the occurrence of such an Event of Default consist exclusively of the right to receive special interest on the Securities at an annual rate equal to 0.25% of the principal amount of the outstanding Securities (the “Special
Interest”). The Special Interest will accrue on all outstanding Securities from and including the date on which an Event of Default relating to a failure to comply with the obligations under Section 4.03 or the failure to comply
with the requirements of Section 314(a)(1) of the Trust Indenture Act first occurs to but not including the 60th day thereafter (or such earlier date on which the Event of Default relating to such obligations shall have been cured or waived
pursuant to Section 6.04). On such 60th day (or earlier, if such Event of Default is cured or waived pursuant to Section 6.04 prior to such 60th day), such Special Interest will cease to accrue and, if such Event of Default
has not been cured or waived pursuant to Section 6.04 prior to such 60th day, then the Trustee or the Holders of not less than 25% in principal amount of the outstanding Securities may declare the principal of and accrued and unpaid
interest and Special Interest on all such Securities to be due and payable immediately. This provision shall not affect the rights of the Holders in the event of the occurrence of any other Event of Default. If the Company elects to pay Special
Interest as the sole remedy for an Event of Default specified in Section 6.01(v) relating to the failure by the Company to comply with its obligations under Section 4.03 and for any failure by the Company to comply with the
requirements of Section 314(a)(1) of the Trust Indenture Act, the Company shall notify, in the manner provided for in Section 11.02, the Holders and the Trustee of such election at any time on or before the close of business on the
date on which such Event of Default first occurs. If Special Interest is payable under this Section 6.02, the Company shall deliver to the Trustee a certificate to that effect stating (i) the amount of Special Interest that is
payable and (ii) the date on which Special 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 Special Interest is
payable. If Special Interest has been paid by the Company directly to the persons entitled to them, the Company shall deliver to the Trustee a certificate setting forth the particulars of such payment. In no event shall Special Interest, together
with any additional interest payable pursuant to the Registration Rights Agreement, be calculated at an aggregate rate exceeding 0.50% per annum. 
  

 -37- 

 6.03 OTHER REMEDIES. 
 Notwithstanding any other provision of this Indenture, if an Event of Default occurs and is continuing, the Trustee may pursue any available remedy by
proceeding at law or in equity to collect the payment of amounts due with respect to the Securities or to enforce the performance of any provision of the Securities or this Indenture. 
 The Trustee may maintain a proceeding even if it does not possess any of the Securities or does not produce any of them in the proceeding. A delay or
omission by the Trustee or any Holder in exercising any right or remedy accruing upon an Event of Default shall not impair the right or remedy or constitute a waiver of or acquiescence in the Event of Default. All remedies are cumulative.

 6.04 WAIVER OF PAST DEFAULTS. 
 Subject to Sections 6.07 and 9.02, the Holders of a majority in aggregate principal amount of the Securities then outstanding may, by notice
to the Trustee, waive any past Default or Event of Default and its consequences, other than (A) a Default or Event of Default in the payment of the principal of, or premium, if any, or interest or additional interest on, any Security, or in the
payment of the Redemption Price, the Option Purchase Price or the Fundamental Change Repurchase Price (or accrued and unpaid interest, if any, payable as herein provided, upon Redemption, Purchase at Holder’s Option or Repurchase Upon
Fundamental Change), (B) a Default or Event of Default arising from a failure by the Company to convert any Securities into shares of Common Stock in accordance with this Indenture or (C) any Default or Event of Default in respect of any
provision of this Indenture or the Securities which, under Section 9.02, cannot be modified or amended without the consent of the Holder of each outstanding Security affected. When a Default or an Event of Default is waived, it is cured
and ceases. This Section 6.04 shall be in lieu of TIA § 316(a)(1)(B), and, as permitted by the TIA, TIA § 316(a)(1)(B) is hereby expressly excluded from this Indenture. 
 6.05 CONTROL BY MAJORITY. 
 The Holders of a majority in aggregate principal amount of the Securities then outstanding may 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 it. However, the Trustee may refuse to follow any direction that conflicts with law or this Indenture, is unduly prejudicial to the rights of other Holders or would involve the Trustee in personal liability unless the
Trustee is offered indemnity reasonably satisfactory to it; provided, that the Trustee may take any other action deemed proper by the Trustee which is not inconsistent with such direction. This Section 6.05 shall be in lieu of TIA
§ 316(a)(1)(A), and, as permitted by the TIA, TIA § 316(a)(1)(A) is hereby expressly excluded from this Indenture. 
 6.06
LIMITATION ON SUITS. 
 Except as provided in Section 6.07, a Securityholder
may not institute any proceeding under this Indenture, or for the appointment of a receiver or a trustee, or for any other remedy under this Indenture unless: 
 (i) the Holder gives to the Trustee written notice of a continuing Event of Default; 
  

 -38- 

 (ii) the Holders of at least twenty five percent (25%) in aggregate principal amount
of the Securities then outstanding make a written request to the Trustee to pursue the remedy; 
 (iii) such Holder or Holders
offer and, if requested, provide to the Trustee indemnity reasonably satisfactory to the Trustee against any loss, liability or expense to or of the Trustee in connection with pursuing such remedy; 
 (iv) the Trustee does not comply with the request within sixty (60) days after receipt of such notice, request and offer of
indemnity; and 
 (v) during such sixty (60) day period, the Holders of a majority in aggregate principal amount of the
Securities then outstanding do not give the Trustee a direction inconsistent with the request. 
 A Securityholder may not use this Indenture
to prejudice the rights of another Securityholder or to obtain a preference or priority over another Securityholder. 
 6.07 RIGHTS
OF HOLDERS TO RECEIVE PAYMENT. 
 Notwithstanding any other
provision of this Indenture, the right of any Holder to receive payment of all amounts due with respect to the Securities, on or after the respective due dates as provided herein, or to bring suit for the enforcement of any such payment on or after
such respective dates, shall not be impaired or affected without the consent of the Holder. 
 Notwithstanding any other provision of this
Indenture, the right of any Holder to convert the Security in accordance with this Indenture, or to bring suit for the enforcement of such right, shall not be impaired or affected without the consent of the Holder. 
 6.08 COLLECTION SUIT BY TRUSTEE. 
 If an Event of Default specified in Section 6.01(i) or (ii) occurs and is continuing, the Trustee may recover judgment in its own
name and as trustee of an express trust against the Company for the whole amount due with respect to the Securities, including any unpaid and accrued interest. 
 6.09 TRUSTEE MAY FILE PROOFS OF CLAIM. 
 The Trustee may file such proofs of claim and other papers or documents as may be necessary or advisable in order to have the claims of the Trustee, any predecessor Trustee and the Securityholders allowed in any judicial proceedings
relative to the Company or its creditors or properties. 
 The Trustee may collect and receive any moneys or other property payable or
deliverable on any such claims and to distribute the same, and any custodian, receiver, assignee, trustee, liquidator, sequestrator or similar official in any judicial proceeding is hereby 

  

 -39- 

 
authorized by each Holder to make such payments to the Trustee and, in the event that the Trustee shall consent to the making of such payments directly to
the Holders, to pay the Trustee any amount due it for the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and counsel, and any other amounts due the Trustee under Section 7.07. 
 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 the Securities 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. 
 6.10 PRIORITIES. 
 If the Trustee
collects any money pursuant to this Article VI, it shall pay out the money in the following order: 
  

			
	 First:
	  	to the Trustee for amounts due under Section 7.07;
		
	 Second:
	  	to Securityholders for all amounts due and unpaid on the Securities, without preference or priority of any kind, according to the amounts due and payable on the Securities;
and
		
	 Third:
	  	to the Company for the balance, if any.

 The Trustee, upon prior written notice to the Company, may fix a record date and payment date for
any payment by it to Securityholders pursuant to this Section 6.10. At least fifteen (15) days before each such record date, the Trustee shall deliver to each Holder and the Company a written notice that states such record date and
payment date and the amount of such payment. 
 6.11 UNDERTAKING FOR COSTS. 
 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, a court in its discretion may require the filing by any party litigant in the suit other than the Trustee of an undertaking to pay the costs of the suit, and the court in its discretion may assess reasonable costs, including reasonable
attorneys’ fees, against any party litigant in the suit, having due regard to the merits and good faith of the claims or defenses made by the party litigant. This Section 6.11 does not apply to a suit by the Trustee, a suit by a
Holder pursuant to Section 6.07 or a suit by Holders of more than ten percent (10%) in aggregate principal amount of the outstanding Securities. 
 VII. TRUSTEE 
 7.01 DUTIES OF TRUSTEE. 
 (A) If an Event of Default has occurred and is continuing, the Trustee shall exercise such of the rights and powers vested in it by this Indenture, and
use the same degree of care and skill in their exercise, as a prudent person would exercise or use under the circumstances in the conduct of his or her own affairs. 
  

 -40- 

 (B) Except during the continuance of an Event of Default: 
 (i) the Trustee need perform only those duties that 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 bad faith, willful misconduct or
negligence on its part, the Trustee may conclusively rely, as to the truth of the statements and the correctness of the opinions expressed therein, upon 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 which by any provision hereof are specifically required to be furnished to the Trustee, the Trustee shall examine the certificates and opinions to determine whether or not they conform
to the requirements of this Indenture (but need not confirm or investigate the accuracy of mathematical calculations or other facts stated therein). 
 (C) The Trustee may not be relieved from liability for its own negligent action, its own negligent failure to act or its own willful misconduct, except that: 
 (i) the Trustee shall not be liable for any error of judgment made in good faith by a Responsible Officer, unless it is proved that the
Trustee was negligent in ascertaining the pertinent facts; and 
 (ii) the Trustee shall not be liable with respect to any
action it takes or omits to take in good faith in accordance with a direction received by it pursuant to Section 6.05. 
 (D)
Every provision of this Indenture that in any way relates to the Trustee is subject to the provisions of this Section 7.01. 
 (E) The Trustee shall not be liable for interest on any money received by it except as the Trustee may agree in writing with the Company. Money held in trust by the Trustee need not be segregated from other funds except to the extent
required by law. 
 7.02 RIGHTS OF TRUSTEE. 
 (A) Subject to Section 7.01, the Trustee may conclusively rely on any document believed by it to be genuine and to have been signed or
presented by the proper person. The Trustee need not investigate any fact or matter stated in the document; if, however, the Trustee shall determine to make such further inquiry or investigation, it shall be entitled during normal business hours to
examine the relevant books, records and premises of the Company, personally or by agent or attorney upon reasonable prior notice. 
  

 -41- 

 (B) Before the Trustee acts or refrains from acting, it may require an Officer’s Certificate and/or
an Opinion of Counsel. The Trustee shall not be liable for any action it takes or omits to take in good faith in reliance on such Officer’s Certificate or Opinion of Counsel. 
 (C) Any request or direction of the Company mentioned herein shall be sufficiently evidenced by a Company Request or Company Order, and any resolution of
the Board of Directors shall be sufficiently evidenced by a Board Resolution. 
 (D) The Trustee may consult with counsel (such counsel to be
reasonably acceptable to the Company), and the advice of such counsel or any Opinion of Counsel shall be full and complete authorization and protection in respect of any action taken, suffered or omitted by it hereunder in good faith and in reliance
thereon. 
 (E) The Trustee may act through agents or attorneys and shall not be responsible for the misconduct or negligence of any agent or
attorney appointed with due care. 
 (F) The Trustee shall not be liable for any action it takes or omits to take in good faith which it
believes to be authorized or within its discretion, rights or powers conferred upon it by this Indenture. 
 (G) Except with respect to
Section 6.01, the Trustee shall have no duty to inquire as to the performance of the Company with respect to the covenants contained in Article IV. In addition, the Trustee shall not be deemed to have knowledge of an Event of
Default except (i) any Default or Event of Default occurring pursuant to Sections 6.01(i) or (ii) or (ii) any Default or Event of Default of which a Responsible Officer of the Trustee shall have received written
notification or obtained actual knowledge. Delivery of reports, information and documents to the Trustee under Article IV (other than Sections 4.04 and 4.07) is for informational purposes only and the Trustee’s receipt of
the foregoing shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including the Company’s compliance with any of its covenants hereunder (as to which the Trustee is
entitled to rely on Officer’s Certificates). 
 (H) Subject to Section 7.01(A), the Trustee shall be under no obligation to
exercise any of the rights or powers vested by this Indenture at the request or direction of any of the Holders pursuant to this Indenture unless such Holders shall have offered to the Trustee security or indemnity reasonably satisfactory to the
Trustee against the costs, expenses and liabilities which might be incurred by it in compliance with such request or direction. 
 (I) The
rights, privileges, protections, immunities and benefits given to the Trustee, including without limitation, its right to be indemnified, are extended to, and shall be enforceable by, the Trustee in each of its capacities hereunder, and each agent,
custodian and other Person employed to act hereunder. 
 (J) The Trustee may request that the Company deliver an Officer’s Certificate
setting forth the names of individuals and/or titles of officers authorized at such time to take specified actions pursuant to this Indenture, which Officer’s Certificate may be signed by any person authorized to sign an Officer’s
Certificate, including any person specified as so authorized in any such certificate previously delivered and not superseded. 
  

 -42- 

 7.03 INDIVIDUAL RIGHTS OF TRUSTEE. 
 The Trustee in its individual or any other capacity may become the owner or pledgee of Securities and may otherwise deal with the Company or any of its
Affiliates with the same rights the Trustee would have if it were not Trustee. Any Securities Agent may do the same with like rights. The Trustee, however, must comply with Sections 7.10 and 7.11. 
 7.04 TRUSTEE’S DISCLAIMER. 
 The Trustee makes no representation as to the validity or adequacy of this Indenture or the Securities; the Trustee shall not be accountable for the Company’s use of the proceeds from the Securities; and the
Trustee shall not be responsible for any statement in the Securities other than its certificate of authentication. 
 7.05 NOTICE
OF DEFAULTS. 
 If a Default or Event of Default occurs and is continuing as to which the Trustee has
received notice pursuant to the provisions of this Indenture, or as to which a Responsible Officer of the Trustee shall have actual knowledge, then the Trustee shall deliver to each Holder a notice of the Default or Event of Default within thirty
(30) days after receipt of such notice or after acquiring such knowledge, as applicable, unless such Default or Event of Default has been cured or waived; provided, however, that, except in the case of a Default or Event of
Default in payment of any amounts due with respect to any Security, the Trustee may withhold such notice if, and so long as it in good faith determines that, withholding such notice is in the best interests of Holders. 
 7.06 REPORTS BY TRUSTEE TO HOLDERS. 
 Within sixty (60) days after each May 15, beginning with May 15, 2008, the Trustee shall deliver to each Securityholder if required by TIA
§ 313(a) a brief report dated as of such May 15 that complies with TIA § 313(c). In such event, the Trustee also shall comply with TIA § 313(b). 
 A copy of each report at the time of its delivering to Securityholders shall be mailed by first class mail to the Company and filed by the Trustee with the SEC and each stock exchange, if any, on which the Securities
are listed. The Company shall promptly notify the Trustee of the listing or delisting of the Securities on or from any stock exchange. 
 7.07
COMPENSATION AND INDEMNITY. 
 The Company shall pay to the Trustee from time to time such
compensation for its services as shall be agreed upon in writing. The Trustee’s compensation shall not be limited by any law on compensation of a trustee of an express trust. The Company shall reimburse the Trustee upon request for all
reasonable out-of-pocket expenses incurred by it. Such expenses shall include the reasonable compensation and out-of-pocket expenses of the Trustee’s agents and counsel. 
  

 -43- 

 The Company shall indemnify the Trustee against any and all loss, liability, damage, claim or expense
(including the reasonable fees and expenses of counsel and taxes other than those based upon the income of the Trustee) incurred by it in connection with the acceptance or administration of this trust and the performance of its duties hereunder,
including the reasonable costs and expenses of defending itself against any claim (whether asserted by the Company, any Holder or any other Person) or liability in connection with the exercise or performance of any of its powers and duties
hereunder. The Company need not pay for any settlement made without its consent. The Trustee shall notify the Company promptly of any claim for which it may seek indemnification. The Company need not reimburse any expense or indemnify against any
loss or liability incurred by the Trustee through the Trustee’s negligence, bad faith or willful misconduct. 
 To secure the
Company’s payment obligations in this Section 7.07, the Trustee shall have a lien prior to the Securities on all money or property held or collected by the Trustee, except as otherwise required by law. 
 The indemnity obligations of the Company with respect to the Trustee provided for in this Section 7.07 shall survive any resignation or
removal of the Trustee. 
 When the Trustee incurs expenses or renders services after an Event of Default specified in
Section 6.01(viii) or (ix) occurs, the expenses and the compensation for the services are intended to constitute expenses of administration under any Bankruptcy Law. 
 7.08 REPLACEMENT OF TRUSTEE. 
 A resignation or removal of the Trustee and appointment of a successor Trustee shall become effective only upon the successor Trustee’s acceptance of appointment as provided in this Section 7.08.

 The Trustee may resign by so notifying the Company in writing thirty (30) Business Days prior to such resignation. The Holders of a
majority in aggregate principal amount of the Securities then outstanding may remove the Trustee by so notifying the Trustee and the Company in writing and may appoint a successor Trustee with the Company’s consent. The Company may remove the
Trustee if: 
 (i) the Trustee fails to comply with Section 7.10; 
 (ii) the Trustee is adjudged a bankrupt or an insolvent; 
 (iii) a receiver or other public officer takes charge of the Trustee or its property; or 
 (iv) the Trustee becomes incapable of acting. 
 If the Trustee resigns or is removed or if a vacancy exists in the office of Trustee for any reason, the Company shall promptly appoint a successor Trustee. 
  

 -44- 

 If a successor Trustee does not take office within thirty (30) days after the retiring Trustee
resigns or is removed, the retiring Trustee (at the Company’s expense), the Company or the Holders of at least ten percent (10%) in aggregate principal amount of the outstanding Securities may petition any court of competent jurisdiction
for the appointment of a successor Trustee. 
 If the Trustee fails to comply with Section 7.10, the Company or any Holder may
petition any court of competent jurisdiction for the removal of the Trustee and the appointment of a successor Trustee. 
 A successor
Trustee shall deliver a written acceptance of its appointment to the retiring Trustee and to the Company. Thereupon the resignation or removal of the retiring Trustee shall become effective, and the successor Trustee shall have all the rights,
powers and duties of the Trustee under this Indenture. The successor Trustee shall deliver a notice of its succession to Securityholders. The retiring Trustee shall promptly transfer all property held by it as Trustee to the successor Trustee,
subject to the lien provided for in Section 7.07. 
 7.09 SUCCESSOR TRUSTEE BY
MERGER, ETC. 
 If the Trustee consolidates with, merges or converts into, or transfers all or substantially
all of its corporate trust business to, another corporation, the successor corporation without any further act shall be the successor Trustee, if such successor corporation is otherwise eligible hereunder. 
 7.10 ELIGIBILITY; DISQUALIFICATION. 
 There shall at all times be a Trustee hereunder that is a corporation organized and doing business under the laws of the United States of America or of any state thereof, which Trustee (A) is authorized under
such laws to exercise corporate trustee power, (B) is subject to supervision or examination by federal or state authorities and (C) has a combined capital and surplus of at least $100 million as set forth in its most recent published
annual report of condition. The Trustee shall comply with TIA § 310(b). Nothing in this Indenture shall prevent the Trustee from filing with the SEC the application referred to in the penultimate paragraph of TIA § 310(b). 
 7.11 PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY. 
 The Trustee shall comply with TIA § 311(a), excluding any creditor relationship listed in TIA § 311(b). A Trustee who has resigned or been
removed shall be subject to TIA § 311(a) to the extent indicated. 
 VIII. DISCHARGE OF INDENTURE 
 8.01 TERMINATION OF THE OBLIGATIONS OF THE COMPANY.

 This Indenture shall cease to be of further effect if (a) either (i) all outstanding Securities (other than Securities replaced
pursuant to Section 2.07 hereof) have been delivered to the Trustee for cancellation or (ii) all outstanding Securities have become due 

  

 -45- 

 
and payable at their scheduled maturity or upon Purchase at Holder’s Option, Redemption or Repurchase Upon Fundamental Change, and in either case the
Company irrevocably deposits, prior to the applicable due date, with the Trustee or the Paying Agent (if the Paying Agent is not the Company or any of its Affiliates) cash sufficient to pay all amounts due and owing on all outstanding Securities
(other than Securities replaced pursuant to Section 2.07 hereof) on the Maturity Date or an Option Purchase Date, Redemption Date or Fundamental Change Repurchase Date, as the case may be; (b) the Company pays to the Trustee all
other sums payable hereunder by the Company; (c) no Default or Event of Default with respect to the Securities shall exist on the date of such deposit; (d) such deposit will not result in a breach or violation of, or constitute a Default
or Event of Default under, this Indenture or any other agreement or instrument to which the Company is a party or by which it is bound; and (e) the Company has delivered to the Trustee an Officer’s Certificate and an Opinion of Counsel,
each stating that all conditions precedent provided for herein relating to the satisfaction and discharge of this Indenture have been complied with; provided, however, that Sections 2.02, 2.03, 2.04, 2.05,
2.06, 2.07, 2.08, 2.15, 2.16, 2.17, 3.05, 3.08, 3.09, 4.01, 4.02, 4.05, 7.07 and 7.08 and Articles VIII and X shall survive any discharge
of this Indenture until such time as the Securities have been paid in full and there are no Securities outstanding. 
 8.02 APPLICATION
OF TRUST MONEY. 
 The Trustee shall hold in trust all money deposited with it pursuant to
Section 8.01 and shall apply such deposited money through the Paying Agent and in accordance with this Indenture to the payment of amounts due on the Securities. 
 8.03 REPAYMENT TO COMPANY. 
 The Trustee and the Paying
Agent shall promptly notify the Company of, and pay to the Company upon the request of the Company, any excess money held by them at any time. The Trustee or the Paying Agent, as the case may be, shall provide written notice to the Company of any
money that has been held by it and has, for a period of two (2) years, remained unclaimed for the payment of the principal of, or any accrued and unpaid interest on, the Securities. The Trustee and the Paying Agent shall pay to the Company upon
the written request of the Company any money held by them for the payment of the principal of, premium, if any, or any accrued and unpaid interest or additional interest on, the notes that remains unclaimed for two (2) years; provided,
however, that the Trustee or such Paying Agent, before being required to make any such repayment, may, at the expense of the Company, cause to be published once in a newspaper of general circulation in the City of New York or cause to be
delivered to each Holder, notice stating that such money remains unclaimed and that, after a date specified therein, which shall not be less than thirty (30) days from the date of such publication or delivery, any unclaimed balance of such
money then remaining will be repaid to the Company. After payment to the Company, Securityholders entitled to the money must look to the Company for payment as general creditors, subject to applicable law, and all liability of the Trustee and the
Paying Agent with respect to such money and payment shall, subject to applicable law, cease. 
  

 -46- 

 8.04 REINSTATEMENT. 
 If the Trustee or Paying Agent is unable to apply any money in accordance with Sections 8.01 and 8.02 by reason of any legal proceeding or by reason of any order or judgment of any court or governmental
authority enjoining, restraining or otherwise prohibiting such application, the obligations of the Company under this Indenture and the Securities shall be revived and reinstated as though no deposit had occurred pursuant to Sections 8.01 and
8.02 until such time as the Trustee or Paying Agent is permitted to apply all such money in accordance with Sections 8.01 and 8.02; provided, however, that if the Company has made any payment of amounts due with
respect to any Securities because of the reinstatement of its obligations, then the Company shall be subrogated to the rights of the Holders of such Securities to receive such payment from the money held by the Trustee or Paying Agent. 

IX. AMENDMENTS 
 9.01 Without Consent of
Holders. 
 The Company, with the consent of the Trustee, may amend or supplement this Indenture or the Securities without notice to or
the consent of any Securityholder: 
 (i) to comply with Sections 5.01 and 10.12; 
 (ii) to make any changes or modifications to this Indenture necessary in connection with the registration of the public offer and sale of
the Securities under the Securities Act pursuant to the Registration Rights Agreement or the qualification of this Indenture under the TIA; 
 (iii) to secure the obligations of the Company in respect of the Securities; 
 (iv) to add to
the covenants of the Company described in this Indenture for the benefit of Securityholders or to surrender any right or power conferred upon the Company; and 
 (v) to make provisions with respect to adjustments to the Conversion Rate as required by this Indenture or to increase the Conversion Rate
in accordance with this Indenture. 
 In addition, the Company and the Trustee may enter into a supplemental indenture without the consent of
Holders of the Securities to (i) cure any ambiguity, defect, omission or inconsistency in this Indenture in a manner that does not, individually or in the aggregate with all other modifications made or to be made to the Indenture, adversely
affect the rights of any Holder in any material respect; or (ii) conform this Indenture to the description of the Securities contained in the Offering Memorandum of the Company, dated March 22, 2007. 
  

 -47- 

 9.02 WITH CONSENT OF HOLDERS. 
 The Company, with the consent of the Trustee, may amend or supplement this Indenture or the Securities without notice to any Securityholder but with the
written consent of the Holders of at least a majority in aggregate principal amount of the outstanding Securities. Subject to Sections 6.04 and 6.07, the Holders of a majority in aggregate principal amount of the outstanding Securities may,
by notice to the Trustee, waive compliance by the Company with any provision of this Indenture or the Securities without notice to any other Securityholder. Notwithstanding anything herein to the contrary, without the consent of each Holder of each
outstanding Security affected, an amendment, supplement or waiver, including a waiver pursuant to Section 6.04, may not: 
 (a) change the stated maturity of the principal of, or the payment date of any installment of interest or additional interest on, any Security; 
 (b) reduce the principal amount of, or any premium, interest or additional interest on, any Security; 
 (c) change the place, manner or currency of payment of principal of, or any premium, interest or additional interest on, any Security; 
 (d) impair the right to institute suit for the enforcement of any payment on, or with respect to, or of the conversion of, any Security;

 (e) modify, in a manner adverse to Holders, the provisions with respect to the right of Holders pursuant to Article
III to require the Company to purchase Securities on an Option Purchase Date or to repurchase Securities upon the occurrence of a Fundamental Change; 
 (f) modify the provisions of Section 2.18 in a manner adverse to Holders; 
 (g)
adversely affect the right of Holders to convert Securities in accordance with Article X; 
 (h) reduce the percentage
of the aggregate principal amount of the outstanding Securities whose Holders must consent to a modification to or amendment of any provision of this Indenture or the Securities; 
 (i) reduce the percentage of the aggregate principal amount of the outstanding Securities whose Holders must consent to a waiver of
compliance with any provision of this Indenture or the Securities or a waiver of any Default or Event of Default; or 
 (j)
modify the provisions of this Indenture with respect to modification and waiver (including waiver of a Default or an Event of Default), except to increase the percentage required for modification or waiver or to provide for the consent of each
affected Holder. 
  

 -48- 

 Promptly after an amendment, supplement or waiver under Section 9.01 or this
Section 9.02 becomes effective, the Company shall deliver, or cause to be delivered, to Securityholders a notice briefly describing such amendment, supplement or waiver. Any failure of the Company to deliver such notice shall not in any
way impair or affect the validity of such amendment, supplement or waiver. 
 It shall not be necessary for the consent of the Holders under
this Section 9.02 to approve the particular form of any proposed amendment, supplement or waiver, but it shall be sufficient if such consent approves the substance thereof. 
 9.03 COMPLIANCE WITH TRUST INDENTURE ACT. 
 Every amendment, waiver or supplement to this Indenture or the Securities shall comply with the TIA as then in effect. 
 9.04 REVOCATION AND EFFECT OF CONSENTS. 
 Until an
amendment, supplement or waiver becomes effective, a consent to it by a Holder is a continuing consent by the Holder and every subsequent Holder of a Security or portion of a Security that evidences the same debt as the consenting Holder’s
Security, even if notation of the consent is not made on any Security. However, any such Holder or subsequent Holder may revoke the consent as to its Security or portion of a Security if the Trustee receives the notice of revocation before the date
the amendment, supplement or waiver becomes effective. An amendment, supplement or waiver becomes effective in accordance with its terms and thereafter binds every Holder. 
 After an amendment, supplement or waiver becomes effective with respect to the Securities, it shall bind every Holder unless such amendment, supplement
or waiver makes a change that requires, pursuant to Section 9.02, the consent of each Holder affected. In that case, the amendment, supplement or waiver shall bind each Holder of a Security who has consented to it and, provided that
notice of such amendment, supplement or waiver is reflected on a Security that evidences the same debt as the consenting Holder’s Security, every subsequent Holder of a Security or portion of a Security that evidences the same debt as the
consenting Holder’s Security. 
 9.05 NOTATION ON OR EXCHANGE OF
SECURITIES. 
 If an amendment, supplement or waiver changes the terms of a Security, the Trustee may require the Holder of
the Security to deliver it to the Trustee. The Trustee may place an appropriate notation on the Security as directed and prepared by the Company about the changed terms and return it to the Holder. Alternatively, if the Company so determines, the
Company in exchange for the Security shall issue and the Trustee shall authenticate a new Security that reflects the changed terms. 
  

	9.06	TRUSTEE PROTECTED. 

 The Trustee shall sign any amendment, supplemental indenture or waiver authorized pursuant to this Article IX; provided, however, that the Trustee need not sign any amendment, supplement or waiver authorized pursuant to
this Article IX that adversely 

  

 -49- 

 
affects the Trustee’s rights, duties, liabilities or immunities. The Trustee shall be entitled to receive and conclusively rely upon an Opinion of
Counsel as to legal matters and an Officer’s Certificate as to factual matters that any supplemental indenture, amendment or waiver is permitted or authorized pursuant to this Indenture. 
 9.07 EFFECT OF SUPPLEMENTAL INDENTURES. 
 Upon the due execution and delivery of any supplemental indenture in accordance with this Article IX, this Indenture shall be modified in
accordance therewith, and such supplemental indenture shall form a part of this Indenture for all purposes, and, except as set forth in Sections 9.02 and 9.04, every Holder of Securities shall be bound thereby. 
 X. CONVERSION 
 10.01 CONVERSION
PRIVILEGE; RESTRICTIVE LEGENDS. 
 (A) Subject to the provisions of Article III, the
Securities shall be convertible into shares of Common Stock in accordance with this Article X at any time prior to stated maturity. 
 (B) Notwithstanding anything herein to the contrary, the right to convert the Securities pursuant to this Article X shall terminate at the close of business on the Business Day immediately preceding the Maturity Date. 
 (C) The initial Conversion Rate shall be 122.5490 shares of Common Stock per $1,000 principal amount of Securities. The Conversion Rate shall be subject
to adjustment in accordance with Sections 10.06 through 10.15. 
 (D) A Holder may convert a portion of the principal amount of
a Security if such portion is $1,000 principal amount or an integral multiple of $1,000 principal amount. Provisions of this Indenture that apply to conversion of all of a Security also apply to conversion of a portion of such Security. 

(E) Any shares of Common Stock that are issued upon conversion of a Security shall bear the Private Placement Legend until the earlier of the second
anniversary of the later of the Issue Date and the last date on which the Company or any Affiliate was the owner of such shares or the Security (or any predecessor security) from which such shares were converted (or such shorter period of time as
permitted by Rule 144(k) under the Securities Act or any successor provision thereunder) (or such longer period of time as may be required under the Securities Act or applicable state securities laws, as set forth in an Opinion of Counsel, unless
otherwise agreed by the Company and the Holder thereof) (or, if earlier, the date such shares are sold pursuant to Rule 144 or pursuant to an effective registration statement under the Securities Act). 
 10.02 CONVERSION PROCEDURE. 
 (A) To convert a Security, a Holder must satisfy the requirements of paragraph 10 of the Securities. As soon as practicable on or after the date (the “Conversion Date”) on which the Holder satisfies all those
requirements, the Company shall deliver to the 

  

 -50- 

 
Holder through the Conversion Agent a certificate for the number of full shares of Common Stock issuable upon the conversion, as provided in paragraph
10 of the Securities, and a check for the amount of cash payable in lieu of any fractional share; provided, however, that any Make-Whole Consideration payable pursuant to Section 10.16 shall be delivered by the Company
within the time period specified in Section 10.16(D). 
 (B) On and after the Conversion Date of a Security submitted for
conversion, the person in whose name any certificate representing the shares of Common Stock due in respect of such conversion is to be registered shall be treated as a stockholder of record of the Company, and all rights of the Holder of such
Security shall terminate, other than the right to receive the consideration deliverable upon conversion of such Security as provided herein. A Holder of Securities is not entitled, as such, to any rights of a holder of Common Stock until such Holder
has converted its Securities into shares of Common Stock (to the extent such Securities are convertible into Shares of Common Stock) or is deemed to be a stockholder of record of the Company, as provided in this Section 10.02(B).

 (C) Except as provided in the Securities or in this Article X, no payment or adjustment will be made for accrued interest or
additional interest on a converted Security or for dividends on any Common Stock issued on or prior to conversion, and accrued interest and additional interest, if any, will be deemed to be paid by the consideration paid to the Holder upon
conversion. Such accrued interest and additional interest, if any, shall be deemed to be paid in full rather than cancelled, extinguished or forfeited. If any Holder surrenders a Security for conversion after the close of business on the record date
for the payment of an installment of interest and prior to the related interest payment date, then, notwithstanding such conversion, the interest payable with respect to such Security on such interest payment date shall be paid on such interest
payment date to the Holder of record of such Security at the close of business on such record date; provided, however, that such Security, when surrendered for conversion, must be accompanied by payment to the Conversion Agent on behalf of
the Company of an amount equal to the interest payable on such interest payment date on the portion so converted unless either (i) such Security is called for Redemption pursuant to Section 3.04 and paragraphs 6 and 7 of the
Securities; (ii) the Company shall have, in respect of a Fundamental Change, specified a Fundamental Change Repurchase Date which is after such record date and on or before such interest payment date; or (iii) such Security is surrendered
for conversion after the close of business on the record date immediately preceding the Maturity Date; provided further, however, that, if the Company shall have, prior to the Conversion Date with respect to a Security, defaulted in a payment
of interest on such Security, then in no event shall the Holder of such Security who surrenders such Security for conversion be required to pay such defaulted interest or the interest that shall have accrued on such defaulted interest pursuant to
Section 2.12 or otherwise (it being understood that nothing in this Section 10.02(C) shall affect the Company’s obligations under Section 2.12). 
 (D) If a Holder converts more than one Security at the same time, the number of full shares of Common Stock issuable upon such conversion shall be based
on the total principal amount of all Securities converted. 
  

 -51- 

 (E) Upon surrender of a Security that is converted in part, the Trustee shall authenticate for the Holder
a new Security equal in principal amount to the unconverted portion of the Security surrendered. 
 (F) If the last day on which a Security
may be converted is a Legal Holiday in a place where a Conversion Agent is located, the Security may be surrendered to that Conversion Agent on the next succeeding day that is not a Legal Holiday. 
 10.03 FRACTIONAL SHARES. 
 The Company will not issue fractional shares of Common Stock upon conversion of Securities and instead will deliver a check in an amount equal to the value of such fraction computed on the basis of the Closing Sale Price on the Trading Day
immediately before the Conversion Date. 
 10.04 TAXES ON CONVERSION. 
 If a Holder converts its Security, the Company shall pay any documentary, stamp or similar issue or transfer tax or duty due on the issue, if any, of
shares of Common Stock upon the conversion. However, such Holder shall pay any such tax or duty which is due because such shares are issued in a name other than such Holder’s name. The Conversion Agent may refuse to deliver a certificate
representing the shares of Common Stock to be issued in a name other than such Holder’s name until the Conversion Agent receives a sum sufficient to pay any tax or duty which will be due because such shares are to be issued in a name other than
such Holder’s name. Nothing herein shall preclude any tax withholding required by law or regulation. 
 10.05 COMPANY
TO PROVIDE STOCK. 
 The Company shall at all times reserve out of its authorized but
unissued Common Stock or Common Stock held in its treasury enough shares of Common Stock to permit the conversion, in accordance herewith, of all of the Securities into shares of Common Stock. 
 All shares of Common Stock which may be issued upon conversion of the Securities shall be validly issued, fully paid and non-assessable and shall be free
of preemptive or similar rights and free of any lien or adverse claim. 
 The Company shall comply with all securities laws regulating the
offer and delivery of shares of Common Stock upon conversion of Securities and shall list such shares on each national securities exchange or automated quotation system on which the Common Stock is listed. 
 10.06 ADJUSTMENT OF CONVERSION RATE. 
 The Conversion Rate shall be subject to adjustment from time to time as follows: 
 (a) In case the Company shall (1) pay a dividend in shares of Common Stock to all holders of Common Stock, (2) make a
distribution in shares of Common Stock to all holders of Common Stock, (3) subdivide the outstanding 

  

 -52- 

 
shares of Common Stock into a greater number of shares of Common Stock or (4) combine the outstanding shares of Common Stock into a smaller number of
shares of Common Stock, the Conversion Rate shall be adjusted by multiplying the Conversion Rate in effect immediately prior to close of business on the Ex Date or effective date, as applicable, of such dividend, distribution, subdivision or
combination, by the number of shares of Common Stock that a person who owns only one share of Common Stock immediately before such Ex Date or effective date, as applicable, of such dividend, distribution, subdivision or combination and who is
entitled to participate in such dividend, distribution, subdivision or combination would own immediately after giving effect to such dividend, distribution, subdivision or combination (without giving effect to any arrangement pursuant to such
dividend, distribution, subdivision or combination not to issue fractional shares of Common Stock). Any adjustment made pursuant to this Section 10.06(a) shall become effective immediately after such Ex Date, in the case of a dividend or
distribution, and shall become effective immediately after such effective date, in the case of a subdivision or combination. 
 (b) In case the Company shall issue rights or warrants to all or substantially all holders of Common Stock, entitling them, for a period expiring not more than sixty (60) days immediately following the record date for the determination
of holders of Common Stock entitled to receive such rights or warrants, to subscribe for or purchase shares of Common Stock (or securities convertible into or exchangeable or exercisable for Common Stock), at a price per share (or having a
conversion, exchange or exercise price per share) that is less than the current market price (as determined pursuant to Section 10.06(g)) per share of Common Stock on the record date for the determination of holders of Common Stock
entitled to receive such rights or warrants, the Conversion Rate shall be increased by multiplying the Conversion Rate in effect immediately prior to the Ex Date corresponding to such record date by a fraction of which (A) the numerator shall
be the sum of (I) the number of shares of Common Stock outstanding immediately prior to the open of business on such Ex Date and (II) the aggregate number of shares (the “Underlying Shares”) of Common Stock underlying all such
issued rights or warrants (whether by exercise, conversion, exchange or otherwise), and (B) the denominator shall be the sum of (I) number of shares of Common Stock outstanding immediately prior to the open of business on such Ex Date and
(II) the number of shares of Common Stock which the aggregate exercise, conversion, exchange or other price at which the Underlying Shares may be subscribed for or purchased pursuant to such rights or warrants would purchase at such current market
price per share of Common Stock; provided, however, no adjustment shall be made pursuant to this Section 10.06(b) solely by reason of a distribution of rights pursuant to a stockholders’ rights plan, provided the Company has
complied with the provisions of Section 10.14 with respect to such stockholders’ rights plan and distribution. Such increase shall become effective immediately prior to the open of business on such Ex Date. In no event shall the
Conversion Rate be decreased pursuant to this Section 10.06(b). 
  

 -53- 

 (c) Except as set forth in the immediately following paragraph, in case the Company shall
dividend or distribute to all or substantially all holders of Common Stock shares of Capital Stock of the Company or any existing or future Subsidiary (other than Common Stock), evidences of Indebtedness or other assets (other than dividends or
distributions requiring an adjustment to the Conversion Rate in accordance with Sections 10.06(d) or 10.06(e)), or shall dividend or distribute to all or substantially all holders of Common Stock rights or warrants to subscribe for or
purchase securities (other than dividends or distributions of rights or warrants requiring an adjustment to the Conversion Rate in accordance with Section 10.06(b)), then in each such case the Conversion Rate shall be increased by
multiplying the Conversion Rate in effect immediately prior to the open of business on the Ex Date corresponding to the record date for the determination of stockholders entitled to such dividend or distribution by a fraction of which (A) the
numerator shall be the current market price per share of Common Stock (as determined pursuant to Section 10.06(g)) on such record date and (B) the denominator shall be an amount equal to (I) such current market price per share
of Common Stock less (II) the fair market value (as determined in good faith by the Board of Directors, whose determination shall be conclusive and described in a Board Resolution), on such Ex Date, of the portion of the shares of Capital Stock,
evidences of Indebtedness, assets, rights and warrants to be dividended or distributed applicable to one share of Common Stock, such increase to become effective immediately prior to the open of business on such Ex Date; provided,
however, that if such denominator is equal to or less than zero, then, in lieu of the foregoing adjustment to the Conversion Rate, adequate provision shall be made so that each Holder shall have the right to receive upon conversion of its
Securities, in addition to any consideration otherwise payable as herein provided upon such conversion, an amount of shares of Capital Stock, evidences of Indebtedness, assets, rights and/or warrants that such Holder would have received had such
Holder converted all of its Securities on such record date. Notwithstanding the foregoing, in the event that the Company shall distribute rights or warrants (other than distributions of rights or warrants requiring an adjustment to the Conversion
Rate in accordance with Section 10.06(b) and other than rights under the Rights Agreement or any other stockholders’ rights plan the Company may have in effect at such time) (collectively, “Rights”) pro rata
to holders of Common Stock, the Company may, in lieu of making any adjustment pursuant to this Section 10.06(c), make proper provision so that each Holder of a Security who converts such Security (or any portion thereof) on or after the
record date for such distribution and prior to the expiration or redemption of the Rights shall be entitled to receive upon such conversion, in addition to the shares of Common Stock issuable (and cash, if any, payable) upon such conversion (the
“Conversion Shares”), the same number of Rights to which a holder of a number of shares of Common Stock equal to the number of shares of Conversion Shares would be entitled at the time of such conversion in accordance with the terms
and provisions of and applicable to the Rights. Notwithstanding the first sentence of this Section 10.06(c), a distribution of rights pursuant to a stockholders’ rights plan shall not constitute a dividend or distribution requiring
an adjustment to the Conversion Rate pursuant to the first sentence of this Section 10.06(c), provided 

  

 -54- 

 
that (1) such rights have not separated from the Common Stock at the time of such distribution; and (2) the Company has made adequate provision in
accordance with Section 10.14 for Holders to receive such rights upon conversion. In no event shall the Conversion Rate be decreased pursuant to this Section 10.06(c). 
 Notwithstanding anything to the contrary in this Section 10.06(c), if, in a distribution requiring an adjustment to the
Conversion Rate pursuant to the immediately preceding paragraph, the property distributed by the Company to all Holders of Common Stock consists solely of Capital Stock, or similar equity interests in, a Subsidiary or other business unit of the
Company, which Capital Stock or interests are, or will be upon completion of such distribution, listed on a national securities exchange or quoted on an automated quotation system and closing sale prices for such Capital Stock or interests are
readily available (a “Spin-Off”), then in lieu of adjusting the Conversion Rate in accordance with the immediately preceding paragraph, the Conversion Rate shall be increased (subject to the other terms of this Indenture) by
multiplying the Conversion Rate in effect immediately prior to the opening of business on the thirteenth (13th) Trading Day following the record date for such distribution by a fraction (I) whose numerator is the sum of (A) the
average of the Closing Sale Prices per share of Common Stock for the ten (10) consecutive Trading Days commencing on, and including, the third (3rd) Trading Day after the record date for such distribution and (B) the product of
(i) the average of the Closing Sale Prices per share or unit, as applicable, of such Capital Stock or interests (determined as if such shares or units were shares of Common Stock for purposes of the definition of “Closing Sale Price”)
for the for the ten (10) consecutive Trading Days commencing on, and including, the third (3rd) Trading Day after the record date for such distribution and (ii) number of shares or units, as applicable, of such Capital Stock or
interests distributed per share of Common Stock; and (II) whose denominator is the average of the Closing Sale Prices per share of Common Stock for the ten (10) consecutive Trading Days commencing on, and including, the third (3rd) Trading
Day after the record date for such distribution. The average Closing Sale Prices referred to in the immediately preceding sentence shall be subject to appropriate adjustments, in the Company’s good faith determination, to account for other
distributions, stock splits and combinations, stock dividends, reclassifications and similar events. Each adjustment to the Conversion Rate made pursuant to this paragraph shall become effective immediately after the open of business on the
thirteenth (13th) Trading Day following the record date for such distribution. 
 Rights or warrants distributed by the
Company to all holders of Common Stock entitling the holders thereof to subscribe for or purchase shares of the Company’s Capital 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 Common Stock; (ii) are not exercisable; and (iii) are also issued in respect of future issuances of Common Stock,
shall be deemed not to have been distributed for purposes of this Section 10.06 (and no adjustment to the Conversion Rate under this Section 10.06 will be required) until the occurrence of the earliest Trigger 

  

 -55- 

 
Event, whereupon such rights, options and warrants shall be deemed to have been distributed and an appropriate adjustment (if any is required) to the
Conversion Rate shall be made under this Section 10.06(c). In no event shall the Conversion Rate be decreased pursuant to this Section 10.06(c). 
 (d) In case the Company shall, by dividend or otherwise, at any time make a distribution of cash (excluding any cash that is distributed
as part of a distribution requiring a Conversion Rate adjustment pursuant to Section 10.06(e)) to all or substantially all holders of Common Stock, the Conversion Rate shall be increased by multiplying the Conversion Rate in effect
immediately prior to the open of business on the Ex Date for such distribution by a fraction (A) whose numerator shall be the current market price per share of Common Stock (as determined pursuant to Section 10.06(g)) on such Ex
Date and (B) whose denominator shall be an amount equal to (I) such current market price per share of Common Stock less (II) the amount of the distribution per share of Common Stock; provided, however, that the Conversion
Rate shall not be adjusted pursuant to this Section 10.06(d) to the extent, and only to the extent, such adjustment would cause the Conversion Price to be less than $0.001 (which minimum amount shall be subject to appropriate
adjustments, in the good faith determination of the Board of Directors), to account for stock splits and combinations, stock dividends, reclassifications and similar events); provided further that, if the denominator of such fraction shall be
equal to or less than zero, the Conversion Rate shall be instead adjusted so that the Conversion Price is equal to $0.001 (as adjusted in accordance with the immediately preceding proviso). An adjustment to the Conversion Rate pursuant to this
Section 10.06(d) shall become effective immediately prior to the open of business on such Ex Date. In no event shall the Conversion Rate be decreased pursuant to this Section 10.06(d). 
 (e) In case the Company or any Subsidiary shall distribute cash or other consideration in respect of a tender offer or exchange offer made
by the Company or any Subsidiary for all or any portion of the Common Stock where the sum of the aggregate amount of such cash distributed and the aggregate fair market value (as determined in good faith by the Company), as of the Expiration Date
(as defined below), of such other consideration distributed (such sum, the “Aggregate Amount”) expressed as an amount per share of Common Stock validly tendered or exchanged, and not withdrawn, pursuant to such tender offer or
exchange offer as of the Expiration Time (as defined below) (such tendered or exchanged shares of Common Stock, the “Purchased Shares”) exceeds the Closing Sale Price per share of Common Stock on the first Trading Day after the last
date (such last date, the “Expiration Date”) on which tenders or exchanges could have been made pursuant to such tender offer or exchange offer (as the same may be amended through the Expiration Date), then the Conversion Rate shall
be increased by multiplying the Conversion Rate in effect immediately prior to the close of business on the first Trading Day after the Expiration Date by a fraction (A) whose numerator is equal to the sum of (I) the Aggregate Amount and
(II) the product of (a) the Closing Sale Price per share of Common Stock on the first Trading Day 

  

 -56- 

 
after the Expiration Date and (b) an amount equal to (i) the number of shares of Common Stock outstanding as of the last time (the
“Expiration Time”) at which tenders or exchanges could have been made pursuant to such tender offer or exchange offer (including all Purchased Shares) less (ii) the Purchased Shares and (B) whose denominator is equal to
the product of (I) the number of shares of Common Stock outstanding as of the Expiration Time (including all Purchased Shares) and (II) such Closing Sale Price per share of Common Stock. 
 An increase, if any, to the Conversion Rate pursuant to this Section 10.06(e) shall become effective immediately prior to the
open of business on the Business Day following the first Trading Day after the Expiration Date. In the event that the Company or a Subsidiary 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 effecting any such purchases, or all such purchases are rescinded, then the Conversion Rate shall again be adjusted to be the Conversion Rate which would then be in
effect if such tender offer or exchange offer had not been made. If the application of this Section 10.06(e) to any tender offer or exchange offer would result in a decrease in the Conversion Rate, no adjustment shall be made for such
tender offer or exchange offer under this Section 10.06(e). 
 (f) In addition to the foregoing adjustments in
subsections (a), (b), (c), (d) and (e) above, the Company, from time to time and to the extent permitted by law and by the continued listing requirements of the NASDAQ Global Market or any other
securities exchange in which the Common Stock may then be listed, may increase the Conversion Rate by any amount for a period of at least twenty (20) days or such longer period as may be permitted or required by law, if the Board of Directors
has made a determination, which determination shall be conclusive, that such increase would be in the best interests of the Company, provided, that such increase will not cause the then effective Conversion Price to be less than $0.001. Such
Conversion Rate increase shall be irrevocable during such period. The Company shall give notice to the Trustee and cause notice of such increase to be delivered to each Holder of Securities at such Holder’s address as the same appears on the
registry books of the Registrar, at least fifteen (15) days prior to the date on which such increase commences. 
 (g)
For the purpose of any computation under subsections (a), (b), (c) or (d) above of this Section 10.06, the “current market price” per share of Common Stock on any date shall be deemed to be the
average of the Closing Sale Prices for the ten (10) consecutive Trading Days ending on, but excluding, the earlier of such date and the Ex Date with respect to the issuance or distribution requiring such computation; provided,
however, that such current market price per share of Common Stock shall be appropriately adjusted by the Company, in its good faith determination, to account for any adjustment, pursuant hereto, to the Conversion Rate that shall become
effective, or any event requiring, pursuant hereto, an 

  

 -57- 

 
adjustment to the Conversion Rate where the Ex Date of such event occurs, at any time during the period that begins on, and includes, the first day of such
ten (10) consecutive Trading Days and ends on, and includes, the date when the adjustment to the Conversion Rate on account of the event requiring the computation of such current market price becomes effective. 
 The term “Ex Date,” (i) when used with respect to any issuance or distribution, means the first date on which the
Common Stock trades the regular way on the relevant exchange or in the relevant market from which the Closing Sale Price was obtained without the right to receive such issuance or distribution, (ii) when used with respect to any subdivision or
combination of shares of Common Stock, means the first date on which the Common Stock trades the regular way on such exchange or in such market after the time at which such subdivision or combination becomes effective, and (iii) when used with
respect to any tender offer or exchange offer means the first date on which the Common Stock trades the regular way on such exchange or in such market after the expiration time of such tender offer or exchange offer (as it may be amended or
extended). For purposes of determining the Ex Date with respect to an issuance or distribution under this Indenture, the Company may conclusively assume (and such assumption shall be binding upon the Holders) that purchases and sales of the relevant
security with respect to which such issuance or distribution is being made will settle based on the customary settlement cycle for purchases or sales of such security. 
 Unless the context requires otherwise, the term “record date” means, with respect to any dividend, distribution or other
transaction or event in which the holders of shares of Common Stock have the right to receive any cash, securities or other property or in which the shares of Common Stock (or other applicable security) is exchanged for or converted into any
combination of cash, securities or other property, the date fixed for determination of stockholders entitled to receive such cash, securities or other property (whether such date is fixed by the Board of Directors or by statute, contract or
otherwise). 
 10.07 NO ADJUSTMENT. 
 Notwithstanding anything herein or in the Securities to the contrary, in no event shall the Conversion Rate be adjusted pursuant to this Indenture or the Securities to the extent such adjustment shall reduce the
Conversion Price to an amount that is less than the par value per share of Common Stock. 
 No adjustment in the Conversion Rate pursuant to
Section 10.06 shall be required until cumulative adjustments amount to one percent (1%) or more of the Conversion Rate as last adjusted (or, if never adjusted, the initial Conversion Rate); provided, however, that any
adjustments to the Conversion Rate which by reason of this Section 10.07 are not required to be made shall be carried forward and taken into account in any subsequent adjustment to the Conversion Rate; provided further, that at
the end of each fiscal year of the Company, beginning with the fiscal year ending on December 31, 2007, any adjustments to the Conversion Rate that 

  

 -58- 

 
have been, and at such time remain, deferred pursuant to this Section 10.07 shall be given effect, and such adjustments, if any, shall no longer
be carried forward and taken into account in any subsequent adjustment to the Conversion Rate; provided further, that if the Company shall deliver a notice of Redemption pursuant to Section 3.04, or if a Fundamental Change or
Make-Whole Fundamental Change occurs, then, in each case, any adjustments to the Conversion Rate that have been, and at such time remain, deferred pursuant to this Section 10.07 shall be given effect, and such adjustments, if any, shall
no longer be carried forward and taken into account in any subsequent adjustment to the Conversion Rate. All calculations under this Article X shall be made to the nearest cent or to the nearest one-millionth of a share, as the case may be.

 If any rights, options or warrants issued by the Company and requiring an adjustment to the Conversion Rate in accordance with
Section 10.06 are only exercisable upon the occurrence of certain triggering events, then the Conversion Rate will not be adjusted as provided in Section 10.06 until the earliest of such triggering event occurs. Upon the
expiration or termination of any such rights, options or warrants without the exercise of such rights, options or warrants, the Conversion Rate then in effect shall be adjusted immediately to the Conversion Rate which would have been in effect at
the time of such expiration or termination had such rights, options or warrants, to the extent outstanding immediately prior to such expiration or termination, never been issued. 
 If any dividend or distribution is declared and the Conversion Rate is adjusted pursuant to Section 10.06 on account of such dividend or
distribution, but such dividend or distribution is thereafter not paid or made, the Conversion Rate shall again be adjusted to the Conversion Rate which would then be in effect had such dividend or distribution not been declared. 
 No adjustment to the Conversion Rate need be made pursuant to Section 10.06 for a transaction if each Holder is to participate in the
transaction, at substantially the same time that holders of Common Stock participate in such transaction, without conversion as if such Holder held a number of shares of Common Stock equal to a fraction whose numerator is the product of the
Conversion Rate in effect at the Ex Date or effective date, as applicable, of the transaction (without giving effect to any adjustment pursuant to Section 10.06 on account of such transaction) and the aggregate principal amount of
Securities held by such Holder and whose denominator is one thousand (1,000). 
 Notwithstanding anything herein to the contrary, in no event
shall the Conversion Rate be increased pursuant to Section 10.06(b), Section 10.06(c), Section 10.06(d) or Section 10.06(e) to the extent, but only to the extent, such increase shall cause the Conversion Rate
applicable to such Security to exceed 156.2500 shares per $1,000 principal amount (the “BCF Adjustment Cap”); provided, however, that the BCF Adjustment Cap shall be adjusted in the same manner in which the Conversion
Rate is to be adjusted pursuant to this Article X for stock splits and combinations, stock dividends, reclassifications and similar events. 
 10.08
OTHER ADJUSTMENTS. 
 In the event that, as a result of an adjustment made pursuant to this Article
X, the Holder of any Security thereafter surrendered for conversion shall become entitled to receive any shares of Capital Stock other than shares of Common Stock, thereafter the Conversion Rate of such other shares so receivable upon conversion
of any Security shall be subject to adjustment from time to time in a manner and on terms as nearly equivalent as practicable to the provisions with respect to Common Stock contained in this Article X. 
  

 -59- 

 10.09 ADJUSTMENTS FOR TAX PURPOSES. 
 Except as prohibited by law or by the continued listing requirements of the NASDAQ Global Market or any other securities exchange in which the Common
Stock may then be listed, the Company may (but is not obligated to) make such increases in the Conversion Rate, in addition to those required by Section 10.06 hereof, as it determines to be advisable in order that any stock dividend,
subdivision of shares, distribution of rights to purchase stock or securities or distribution of securities convertible into or exchangeable for stock made by the Company or to its stockholders will not be taxable to the recipients thereof or in
order to diminish any such taxation. 
 10.10 NOTICE OF ADJUSTMENT. 
 Whenever the Conversion Rate is adjusted, the Company shall promptly deliver, or cause to be delivered, to Holders at the addresses appearing on the
Registrar’s books a notice of the adjustment and file with the Trustee an Officer’s Certificate briefly stating the facts requiring the adjustment and the manner of computing it. The certificate shall be conclusive evidence of the
correctness of such adjustment. 
 10.11 NOTICE OF CERTAIN TRANSACTIONS. 
 In the event that: 
 (1) the
Company takes any action, or becomes aware of any event, which would require an adjustment in the Conversion Rate, 
 (2) the
Company takes any action that would require a supplemental indenture pursuant to Section 10.12, or 
 (3) there
is a dissolution or liquidation of the Company, 
 the Company shall deliver to Holders at the addresses appearing on the Registrar’s books and the
Trustee a written notice stating the proposed record, effective or expiration date, as the case may be, of any transaction referred to in clause (1), (2) or (3) of this Section 10.11. The Company shall
deliver such notice at least twenty (20) calendar days (or, in the case of any event that would require an adjustment in the Conversion Rate pursuant to Sections 10.06(b), 10.06(c), 10.06(d) or 10.06(e), forty five
(45) calendar days) before such date; however, failure to deliver such notice or any defect therein shall not affect the validity of any transaction referred to in clause (1), (2) or (3) of this
Section 10.11. 
  

 -60- 

 10.12 EFFECT OF RECLASSIFICATIONS, CONSOLIDATIONS,
MERGERS, BINDING SHARE EXCHANGES OR SALES ON CONVERSION PRIVILEGE. 
 If any of the following shall occur, namely: (i) any reclassification or change in the Common Stock issuable upon conversion of Securities (other
than a change only in par value, or from par value to no par value, or from no par value to par value, or as a result of a subdivision or combination of Common Stock), (ii) any consolidation, merger or binding share exchange to which the
Company is a party other than a merger in which the Company is the continuing Person and which does not result in any reclassification of, or change (other than a change in name, or par value, or from par value to no par value, or from no par value
to par value or as a result of a subdivision or combination) in, the Common Stock or (iii) any sale, transfer, lease, conveyance or other disposition of all or substantially all of the property or assets of the Company, or of the Company and
the Subsidiaries on a consolidated basis, in each case pursuant to which the Common Stock would be converted into or exchanged for, or would constitute solely the right to receive, cash, securities or other property, then the Company or such
successor or purchasing Person, as the case may be, shall execute and deliver to the Trustee a supplemental indenture in form reasonably satisfactory to the Trustee providing that, at and after the effective time of such reclassification, change,
consolidation, merger, binding share exchange, sale, transfer, lease, conveyance or disposition, the Holder of each Security then outstanding shall have the right to convert such Security into the kind and amount of cash, securities or other
property (collectively, “Reference Property”) receivable upon such reclassification, change, consolidation, merger, binding share exchange, sale, transfer, lease, conveyance or disposition by a holder of a number of shares of Common
Stock equal to a fraction whose denominator is one thousand (1,000) and whose numerator is the product of the principal amount of such Security and the Conversion Rate in effect immediately prior to such reclassification, change, consolidation,
merger, binding share exchange, sale, transfer, lease, conveyance or disposition (assuming, if holders of Common Stock shall have the opportunity to elect the form of consideration to receive pursuant to such reclassification, change, consolidation,
merger, binding share exchange, sale, transfer, lease, conveyance or disposition, that the Collective Election shall have been made with respect to such election. 
 If holders of Common Stock shall have the opportunity to elect the form of consideration to receive pursuant to such reclassification, change, consolidation, merger, binding share exchange, sale, transfer, lease,
conveyance or disposition, then the Company shall make adequate provision to give Holders, treated as a single class, a reasonable opportunity to elect (the “Collective Election”) the form of such consideration for purposes of
determining the composition of the Reference Property referred to in the immediately preceding sentence, and once such election is made, such election shall apply to all Holders after the effective time of such reclassification, change,
consolidation, merger, binding share exchange, sale, transfer, lease, conveyance or disposition. Such Collective Election shall be determined based on the weighted average of the elections made by Holders of the Securities who participate in such
determination, shall be subject to any limitations to which all of the holders of Common Stock are subject, such as pro-rata reductions applicable to any portion of the consideration payable in such reclassification, change, consolidation, merger,
binding share exchange, sale, transfer, lease, conveyance or disposition, and shall be conducted in such a manner as to be completed by the close of business on the actual effective date of such reclassification, change, consolidation, merger,
binding share exchange, sale, transfer, lease, conveyance or disposition. The Company shall provide notice of the opportunity to determine the form of such 

  

 -61- 

 
consideration, as well as notice of the determination made by Holders, by issuing a press release and providing a copy of such notice to the Trustee. The
Company shall not become a party to any reclassification, change, consolidation, merger, binding share exchange, sale, transfer, lease, conveyance or disposition, the terms of which are inconsistent with this paragraph and the immediately preceding
paragraph. 
 The supplemental indenture referred to in the first sentence of this Section 10.12 shall provide for adjustments of
the Conversion Rate which shall be as nearly equivalent as may be practicable to the adjustments of the Conversion Rate provided for in this Article X. The foregoing, however, shall not in any way affect the right a Holder of a Security may
otherwise have, pursuant to Section 10.06(b) or Section 10.14, to receive rights or warrants upon conversion of a Security. If, in the case of any such consolidation, merger, binding share exchange, sale, transfer, lease,
conveyance or disposition, the stock or other securities and property (including cash) receivable thereupon by a holder of Common Stock includes shares of stock or other securities and property of a Person other than the successor or purchasing
Person, as the case may be, in such consolidation, merger, binding share exchange, sale, transfer, lease, conveyance or disposition, then such supplemental indenture shall also be executed by such other Person and shall contain such additional
provisions to protect the interests of the Holders of the Securities as the Board of Directors in good faith shall reasonably determine necessary by reason of the foregoing (which determination shall be described in a Board Resolution). The
provisions of this Section 10.12 shall similarly apply to successive consolidations, mergers, binding share exchanges, sales, transfers, leases, conveyances or dispositions. 
 In the event the Company shall execute a supplemental indenture pursuant to this Section 10.12, the Company shall promptly file with the
Trustee an Officer’s Certificate briefly stating the reasons therefor, the kind or amount of shares of stock or securities or property (including cash) receivable by Holders of the Securities upon the conversion of their Securities after any
such reclassification, change, consolidation, merger, binding share exchange, sale, transfer, lease, conveyance or disposition and any adjustment to be made with respect thereto. 
 10.13 TRUSTEE’S DISCLAIMER. 
 The Trustee has no
duty to determine when an adjustment under this Article X should be made, how it should be made or what such adjustment should be, but may accept as conclusive evidence of the correctness of any such adjustment, and shall be protected in
relying upon, the Officer’s Certificate with respect thereto which the Company is obligated to file with the Trustee pursuant to Section 10.10 hereof. The Trustee makes no representation as to the validity or value of any securities
or assets issued upon conversion of Securities, and the Trustee shall not be responsible for the failure by the Company to comply with any provisions of this Article X. 
 The Trustee shall not be under any responsibility to determine the correctness of any provisions contained in any supplemental indenture executed
pursuant to Section 10.12, but may accept as conclusive evidence of the correctness thereof, and shall be protected in relying upon, the Officer’s Certificate with respect thereto which the Company is obligated to file with the
Trustee pursuant to Section 10.12 hereof. 
  

 -62- 

 10.14 RIGHTS DISTRIBUTIONS PURSUANT TO
STOCKHOLDERS’ RIGHTS PLANS. 
 Upon conversion of any Security or a portion thereof, the
Company shall make provision such that the Holder thereof shall, to the extent such Holder is to receive shares of Common Stock upon such conversion, receive, in addition to, and concurrently with the delivery of, the consideration otherwise payable
hereunder upon such conversion, the rights described in the Rights Agreement and any future stockholders’ rights plan(s) of the Company then in effect, unless such rights have separated from the Common Stock at the time of such conversion, in
which case the Conversion Rate shall be adjusted upon such separation in accordance with Section 10.06(c). 
 10.15 ADJUSTMENT
TO THE CONVERSION RATE ON APRIL 1, 2008. 
 If the arithmetic average of the daily “Volume Weighted Average Price” per share of Common Stock for each of the 20 consecutive Trading Days ending on April 1, 2008 is less than the “Floor Price,” the Conversion
Rate shall be increased such that the Conversion Price would represent the greater of (1) 127.5% of such arithmetic average of the daily Volume Weighted Average Price and (2) the Floor Price. This adjustment to the Conversion Rate will
become effective as of the open of business on April 1, 2008 or, if that date is not a business day, the next business day. However, we will not adjust the Conversion Price as described above if doing so would result in a Conversion Price that
is greater than the Conversion Price that would have otherwise been in effect on April 1, 2008. 
 Subject to the continued listing
standards of the NASDAQ Global Market, the Floor Price and the Volume-Weighted Average Price shall be adjusted in accordance with the adjustments to the Conversion Rate described under Section 10.06. No adjustment to the Floor Price or
the Volume-Weighted Average Price shall be made as a result of adjustments to the Conversion Rate described under Section 10.16. In no event will the limitations relating to the BCF Adjustment Cap, as set forth in
Section 10.07, affect the determination of the Floor Price or the Volume-Weighted Average Price. 
 The “Volume-Weighted
Average Price” per share of the Common Stock on a Trading Day is the volume-weighted average price per share of the Common Stock on the NASDAQ Global Market or, if the Common Stock is not then listed on the NASDAQ Global Market, on the
principal exchange or over-the-counter market on which the Common Stock is then listed or traded, from 9:30 a.m. to 4:00 p.m., New York City time, on that Trading Day, as displayed by Bloomberg. If such price is not available, the Volume-Weighted
Average Price means the market value per share of the Common Stock on such day as determined by a nationally recognized investment banking firm retained for this purpose by the Company. 
 The “Floor Price” shall initially mean $6.40, which is the closing sale price per share of the Common Stock on the date of the Offering
Memorandum. 
 The Company shall notify the Holders and the Trustee in the manner provided in Section 11.02 of any adjustment in
the Conversion Rate under this Section 10.15. 
  

 -63- 

 10.16 INCREASED CONVERSION RATE APPLICABLE
TO CERTAIN NOTES SURRENDERED IN CONNECTION WITH MAKE-WHOLE FUNDAMENTAL CHANGES.

 (A) Notwithstanding anything herein to the contrary, the Conversion Rate applicable to each Security that is surrendered for conversion, in
accordance with this Article X, at any time during the period (the “Make-Whole Conversion Period”) that begins on, and includes, the date that is thirty (30) calendar days prior to the date originally announced by the
Company as the anticipated effective date of a Make-Whole Fundamental Change (which anticipated effective date the Company shall disclose, in good faith, in the written notice, public announcement and publication referred to in
Section 10.16(E)) and ends on, and includes, the date that is thirty (30) Business Days after the actual effective date of such Make-Whole Fundamental Change (or, if such Make-Whole Fundamental Change also constitutes a Fundamental
Change, the Fundamental Change Repurchase Date applicable to such Fundamental Change) shall be increased to an amount equal to the Conversion Rate that would, but for this Section 10.16, otherwise apply to such Security pursuant to this
Article X, plus an amount equal to the Make-Whole Applicable Increase; provided, however, that such increase to the Conversion Rate shall not apply if such Make-Whole Fundamental Change is announced by the Company but shall not
be consummated. 
 The additional consideration payable hereunder on account of any Make-Whole Applicable Increase with respect to a Security
surrendered for conversion is herein referred to as the “Make-Whole Consideration.” For avoidance of doubt, the amount of the Make-Whole Consideration due upon the conversion of a Security shall be based on the Cash Settlement
Averaging Period and Volume-Weighted Average Prices applicable to such conversion pursuant to Section 10.02. 
 The Make-Whole
Consideration due upon a conversion of a Security by a Holder shall be paid as soon as practicable, but in no event later than third Business Day after the later of (1) the date such Holder surrenders such Security for such conversion; and
(2) the Effective Date of the applicable Make-Whole Fundamental Change. 
 (B) As used herein, “Make-Whole Applicable
Increase” shall mean, with respect to a Make-Whole Fundamental Change, the amount, set forth in the following table, which corresponds to the effective date of such Make-Whole Fundamental Change (the “Effective Date”) and
the Applicable Price of such Make-Whole Fundamental Change: 
  

													
	 	  	Effective Date
	 Applicable Price
	  	March 22,
2007	  	April 1,
2008	  	April 1,
2009	  	April 1,
2010	  	April 1,
2011	  	April 5,
2012
	 $6.40
	  	33.7010	  	33.7010	  	33.7010	  	33.7010	  	33.7010	  	33.7010
	 $7.50
	  	33.7010	  	31.4977	  	29.1359	  	25.8545	  	20.9465	  	10.7843
	 $10.00
	  	18.9988	  	17.1275	  	14.8785	  	11.7633	  	7.1582	  	0.0000
	 $12.50
	  	11.5574	  	10.2983	  	8.5525	  	6.2408	  	3.1720	  	0.0000
	 $15.00
	  	7.4683	  	6.5655	  	5.2883	  	3.6860	  	1.7779	  	0.0000
	 $17.50
	  	4.9940	  	4.3179	  	3.4018	  	2.3118	  	1.1213	  	0.0000
	 $20.00
	  	4.9696	  	2.8713	  	2.2189	  	1.4800	  	0.7244	  	0.0000

  

 -64- 

													
	 $22.50
	  	3.8947	  	1.8982	  	1.4358	  	0.9358	  	0.4511	  	0.0000
	 $25.00
	  	3.1206	  	1.2257	  	0.9004	  	0.5636	  	0.2530	  	0.0000
	 $27.50
	  	2.5622	  	0.7544	  	0.5282	  	0.3037	  	0.1072	  	0.0000
	 $30.00
	  	2.1510	  	0.4227	  	0.2683	  	0.1216	  	0.0090	  	0.0000
	 $32.50
	  	1.8425	  	0.1911	  	0.0883	  	0.0013	  	0.0000	  	0.0000
	 $35.00
	  	1.6081	  	0.0368	  	0.0000	  	0.0000	  	0.0000	  	0.0000
	 $37.50
	  	1.5319	  	0.0000	  	0.0000	  	0.0000	  	0.0000	  	0.0000
	 $40.00
	  	1.3867	  	0.0000	  	0.0000	  	0.0000	  	0.0000	  	0.0000

 provided, however, that: 
 (i) if the actual Applicable Price of such Make-Whole Fundamental Change is between two (2) prices listed in the table above under
the column titled “Applicable Price,” or if the actual Effective Date of such Make-Whole Fundamental Change is between two dates listed in the table above in the row immediately below the title “Effective Date,” then the
Make-Whole Applicable Increase for such Make-Whole Fundamental Change shall be determined by linear interpolation between the Make-Whole Applicable Increases set forth for such two prices, or for such two dates based on a three hundred and sixty
five (365) day year, as applicable; 
 (ii) if the actual Applicable Price of such Make-Whole Fundamental Change is
greater than $40.00 per share (subject to adjustment as provided in Section 10.16(B)(iii)), or if the actual Applicable Price of such Make-Whole Fundamental Change is less than $6.40 per share (subject to adjustment as provided in
Section 10.16(B)(iii)), then the Make-Whole Applicable Increase shall be equal to zero (0); 
 (iii) if an event
occurs that requires, pursuant to this Article X (other than solely pursuant to this Section 10.16), an adjustment to the Conversion Rate, then, on the date and at the time such adjustment is so required to be made, (A) each
price set forth in the table above under the column titled “Applicable Price” shall be deemed to be adjusted so that such price, at and after such time, shall be equal to the product of (1) such price as in effect immediately before
such adjustment to such price and (2) a fraction whose numerator is the Conversion Rate in effect immediately before such adjustment to the Conversion Rate and whose denominator is the Conversion Rate to be in effect, in accordance with this
Article X, immediately after such adjustment to the Conversion Rate; and (B) each Make-Whole Applicable Increase amount set forth in the table above shall be deemed to be adjusted so that such Make-Whole Applicable Increase, at and after
such time, shall be equal to the product of (1) such Make-Whole Applicable Increase as in effect immediately before such adjustment to such Make-Whole Applicable Increase and (2) a fraction whose numerator is the Conversion Rate to be in
effect, in accordance with this Article X, immediately after such adjustment to the Conversion Rate and whose denominator is the Conversion Rate in effect immediately before such adjustment to the Conversion Rate; 
 (iv) in no event shall the Conversion Rate applicable to any Security be increased pursuant to this Section 10.16 to the
extent, but only to the extent, such increase shall cause the Conversion Rate applicable to such Security to exceed 156.2500 

  

 -65- 

 
shares per $1,000 principal amount (the “BCF Make-Whole Cap”); provided, however, that the BCF Make-Whole Cap shall be
adjusted in the same manner in which, and for the same events for which, the Conversion Rate is to be adjusted pursuant to this Article X; and 
 (v) in no event shall the Conversion Rate applicable to any Security be increased pursuant to this Section 10.16 to the extent, but only to the extent, such increase shall not be permitted by the continued
listing standards of the NASDAQ Global Market; provided, however, that any reduction, pursuant to this Section 10.16(B)(v), in such increase to the Conversion Rate shall be made by the Company in good faith and, to the
extent practical, pro rata in accordance with the principal amount of Securities surrendered for conversion in connection with the applicable Make-Whole Fundamental Change. 
 (C) As used herein, “Applicable Price” shall have the following meaning with respect to a Make-Whole Fundamental Change: (a) if
such Make-Whole Fundamental Change constitutes a Common Stock Change Make-Whole Fundamental Change and the consideration (excluding cash payments for fractional shares or pursuant to statutory appraisal rights) for the Common Stock in such
Make-Whole Fundamental Change consists solely of cash, then the “Applicable Price” with respect to such Make-Whole Fundamental Change shall be equal to the cash amount paid per share of Common Stock in such Make-Whole Fundamental Change;
(b) if such Make-Whole Fundamental Change constitutes an Asset Sale Make-Whole Fundamental Change and the consideration paid for the property and assets of the Company or the Subsidiaries consists solely of cash, then the “Applicable
Price” with respect to such Make-Whole Fundamental Change shall be equal to the cash amount paid for the property and assets of the Company, expressed as an amount per share of Common Stock outstanding on the Effective Date of such Make-Whole
Fundamental Change; and (c) in all other circumstances, the “Applicable Price” with respect to such Make-Whole Fundamental Change shall be equal to the average of the Closing Sale Prices per share of Common Stock for the five
(5) consecutive Trading Days immediately preceding the Effective Date of such Make-Whole Fundamental Change, which average shall be appropriately adjusted by the Company, in its good faith determination, to account for any adjustment, pursuant
hereto, to the Conversion Rate that shall become effective, or any event requiring, pursuant hereto, an adjustment to the Conversion Rate where the Ex Date of such event occurs, at any time during such five (5) consecutive Trading Days.

 (D) The Make-Whole Consideration due upon a conversion of a Security by a Holder shall be paid as soon as practicable after the Conversion
Date of such conversion, but in no event later than the third (3rd) Business Day after the later of (1) the date such Holder surrenders such Security for such conversion; and (2) the Effective Date of the applicable Make-Whole
Fundamental Change. The consideration in which the Make-Whole Consideration is payable shall be determined in accordance herewith, including, without limitation, in accordance with, to the extent applicable, with Section 10.12.

 (E) At least thirty (30) calendar days before the anticipated effective date of each proposed Make-Whole Fundamental Change, the
Company shall deliver to each Holder and to the Trustee, in accordance with Section 11.02, written notice of, and shall publicly 

  

 -66- 

 
announce, through a reputable national newswire service, and publish on the Company’s website, the anticipated effective date of such proposed
Make-Whole Fundamental Change. Each such notice, announcement and publication shall also state that, in connection with such Make-Whole Fundamental Change, the Company shall increase, in accordance herewith, the Conversion Rate applicable to
Securities entitled as provided herein to such increase (along with a description of how such increase shall be calculated and the time periods during which Securities must be surrendered in order to be entitled to such increase). No later than the
third Business Day after the Effective Date of each Make-Whole Fundamental Change, the Company shall deliver, in accordance with Section 11.02, written notice to each Holder and to the Trustee of, and shall publicly announce, through a
reputable national newswire service, and publish on the Company’s website, such Effective Date and the Make-Whole Applicable Increase applicable to such Make-Whole Fundamental Change. 
 (F) For avoidance of doubt, the provisions of this Section 10.16 shall not affect or diminish the Company’s obligations, if any,
pursuant to Article IV with respect to a Make-Whole Fundamental Change. 
 (G) Nothing in this Section 10.16 shall prevent
an adjustment to the Conversion Rate pursuant to Section 10.06 in respect of a Make-Whole Fundamental Change. 
 XI.
MISCELLANEOUS 
 11.01 TRUST INDENTURE ACT CONTROLS. 
 If any provision of this Indenture limits, qualifies or conflicts with another provision which is required to be included in this Indenture by the TIA,
the required provision of the TIA shall control. 
 11.02 NOTICES. 
 Any notice or communication by the Company or the Trustee to the other shall be deemed to be duly given if made in writing and delivered: 
 (A) by hand (in which case such notice shall be effective upon delivery); 
 (B) by facsimile (in which case such notice shall be effective upon receipt of confirmation of good transmission thereof); or 
 (C) by overnight delivery by a nationally recognized courier service (in which case such notice shall be effective on the Business Day immediately after being deposited with such courier service), 
 in each case to the recipient party’s address or facsimile number, as applicable, set forth in this Section 11.02. The Company or the Trustee by notice
to the other may designate additional or different addresses or facsimile numbers for subsequent notices or communications. 
  

 -67- 

 Any notice or communication to a Holder shall be delivered to its address shown on the register kept by
the Registrar. Failure to 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 delivered in the manner provided above, it is duly given, whether or not the addressee receives it. 
 If the Company delivers a notice or communication to Holders, it shall deliver a copy to the Trustee and each Securities Agent at the same time. If the Trustee or the Securities Agent is required, pursuant to the
express terms of this Indenture or the Securities, to deliver a notice or communication to Holders, the Trustee or the Securities Agent, as the case may be, shall also deliver a copy of such notice or communication to the Company. 
 All notices or communications shall be in writing. 
 The Company’s address is: 
 Diversa Corporation 
 4955 Directors Place 
 San Diego, CA 92121 
 Attn: Chief Financial Officer 
 Facsimile:
(858) 526-5553 
 The Trustee’s address is: 
 Wells Fargo Bank, National Association 
 Corporate Trust Services 
 MAC N9303-120 
 680—2nd Avenue South

 Minneapolis, MN 55479 
 Attn:
Diversa Corporation Account Manager 
 Facsimile: (612) 667-9825 
 11.03 COMMUNICATION BY HOLDERS WITH OTHER HOLDERS. 
 Holders may communicate pursuant to TIA § 312(b) with other Holders with respect to their rights under this Indenture or the Securities. The Company,
the Trustee, the Registrar and anyone else shall have the protection of TIA § 312(c). 
 11.04 CERTIFICATE AND
OPINION AS TO CONDITIONS PRECEDENT. 
 Upon any request or
application by the Company to the Trustee to take any action under this Indenture, the Company shall furnish to the Trustee: 
 (i) an Officer’s Certificate stating that, in the opinion of the signatories to such Officer’s Certificate, all conditions precedent, if any, provided for in this Indenture relating to the proposed action have been complied with;
and 
  

 -68- 

 (ii) if requested by the Trustee, an Opinion of Counsel stating that, in the opinion of
such counsel, all such conditions precedent have been complied with. 
 Each signatory to an Officer’s Certificate or an Opinion of
Counsel may (if so stated) rely, effectively, upon an Opinion of Counsel as to legal matters and an Officer’s Certificate or certificates of public officials as to factual matters if such signatory reasonably and in good faith believes in the
accuracy of the document relied upon. 
 11.05 STATEMENTS REQUIRED IN CERTIFICATE
OR OPINION. 
 Each Officer’s Certificate or Opinion of Counsel with respect to compliance with a
condition or covenant provided for in this Indenture shall include: 
 (i) a statement that the person making such certificate
or opinion has read such covenant or condition; 
 (ii) a brief statement as to the nature and scope of the examination or
investigation upon which the statements or opinions contained in such certificate or opinion are based; 
 (iii) a statement
that, in the opinion of such person, he or she has made such examination or investigation as is necessary to enable him or her to express an informed opinion as to whether or not such covenant or condition has been complied with; and 
 (iv) a statement as to whether or not, in the opinion of such person, such condition or covenant has been complied with. 
 11.06 RULES BY TRUSTEE AND AGENTS. 
 The Trustee may make reasonable rules for action by or at a meeting of Holders. The Registrar, Paying Agent or Conversion Agent may make reasonable rules
and set reasonable requirements for their respective functions. 
 11.07 LEGAL HOLIDAYS. 
 A “Legal Holiday” is a Saturday, a Sunday or a day on which banking institutions are not required to be open in the City of New York, in
the State of New York or such other place of payment with respect to the Notes. If a payment date is a Legal Holiday at a place of payment, payment may be made at that place on the next succeeding day that is not a Legal Holiday, and no interest
shall accrue on that payment for the intervening period. 
 A “Business Day” is a day other than a Legal Holiday.

 11.08 DUPLICATE ORIGINALS. 
 The parties may sign any number of copies of this Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. Delivery of an executed counterpart by facsimile shall be
effective as delivery of a manually executed counterpart thereof. 
  

 -69- 

 11.09 GOVERNING LAW. 
 The laws of the State of New York, without regard to principles of conflicts of law, shall govern this Indenture and the Securities. 
 11.10 NO ADVERSE INTERPRETATION OF OTHER AGREEMENTS. 
 This Indenture may not be used to interpret another indenture, loan or debt agreement of the Company or any of its Subsidiaries. Any such indenture, loan
or debt agreement may not be used to interpret this Indenture. 
 11.11 SUCCESSORS. 
 All agreements of the Company in this Indenture and the Securities shall bind its successors. All agreements of the Trustee in this Indenture shall bind
its successors. 
 11.12 SEPARABILITY. 
 In case any provision in this Indenture or in the Securities shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or
impaired thereby and a Holder shall have no claim therefor against any party hereto. 
 11.13 TABLE OF
CONTENTS, HEADINGS, ETC. 
 The Table of Contents, Cross-Reference Table 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. 
 11.14 CALCULATIONS IN RESPECT OF THE SECURITIES. 
 The Company and its agents (including, without limitation, the Bid Solicitation Agent) shall make all calculations under this Indenture and the Securities
in good faith. In the absence of manifest error, such calculations shall be final and binding on all Holders. The Company shall provide a copy of such calculations to the Trustee as required hereunder, and, absent such manifest error, the Trustee
shall be entitled to conclusively rely on the accuracy of any such calculation without independent verification. 
 11.15 NO
PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES OR STOCKHOLDERS. 
 None of the Company’s past, present or future directors, officers, employees or stockholders, as such, shall have any liability for any of the
Company’s obligations under this Indenture or the Securities or for any claim based on, or in respect or by reason of, such obligations or their creation. By accepting a Security, each holder waives and releases all such liability. This waiver
and release is part of the consideration for the issue of the Securities. 
  

 -70- 

 [The Remainder of This Page Intentionally Left Blank; Signature Page Follows]

  

 -71- 

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

			
	DIVERSA CORPORATION
		
	By:	 	 /s/ Edward T. Shonsey

	Name:	 	Edward T. Shonsey
	Title:	 	Chief Executive Officer
	
	WELLS FARGO BANK, NATIONAL ASSOCIATION
		
	By:	 	 /s/ Lynn M. Steiner

	Name:	 	Lynn M. Steiner
	Title:	 	Vice President

 EXHIBIT A 
 [Face of Security] 
 DIVERSA CORPORATION 
 Certificate No.                  
 [INSERT PRIVATE PLACEMENT LEGEND AND GLOBAL SECURITY LEGEND 
 AS REQUIRED] 
 5.50% Convertible Senior Note due 2027 
 CUSIP No.
                         
 Diversa Corporation, a Delaware corporation (the “Company”), for value received, hereby promises to pay to Cede & Co., or its registered assigns, the principal sum of
                                 dollars
($                    ) on April 1, 2027 and to pay interest thereon, as provided on the reverse hereof, until the principal and any
unpaid and accrued interest are paid or duly provided for. 
 Interest Payment Dates: April 1 and October 1, with the first payment
to be made on October 1, 2007. 
 Record Dates: March 15 and September 15. 
 The provisions on the back of this certificate are incorporated as if set forth on the face hereof. 
 IN WITNESS WHEREOF, DIVERSA CORPORATION has caused this instrument to be duly signed. 
  

									
		 		 		 	DIVERSA CORPORATION
					
		 		 		 	By:	 	  

		 		 		 	Name:	 	
		 		 		 	Title:	 	
	 Dated:
	 	  
	 		 		 	

  

 A-1 

 TRUSTEE’S CERTIFICATE OF AUTHENTICATION 
 This is one of the Securities referred to 
 in the within-mentioned Indenture. 
  

							
	 WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee
	  	

			
		
	 By:
	 	  

		 	Authorized Signatory
		
	 Dated:
	 	  

  

 A-2 

 [REVERSE OF SECURITY] 
 DIVERSA CORPORATION 
 5.50% Convertible Senior Note due 2027 
 1. Interest. Diversa Corporation, a Delaware corporation (the “Company”), promises to pay interest on the principal amount of
this Security at the rate per annum shown above. The Company will pay interest, payable semi-annually in arrears, on April 1 and October 1 of each year, with the first payment to be made on October 1, 2007. Interest on the
Securities will accrue on the principal amount from, and including, the most recent date to which interest has been paid or provided for or, if no interest has been paid, from, and including, March 28, 2007, in each case to, but excluding, the
next interest payment date or Maturity Date, as the case may be. Interest will be computed on the basis of a 360-day year of twelve 30-day months. 
 2. Maturity. The Securities will mature on April 1, 2027. 
 3. Method of Payment. Except as provided in the
Indenture (as defined below), the Company will pay interest on the Securities to the persons who are Holders of record of Securities at the close of business on the record date set forth on the face of this Security next preceding the applicable
interest payment date. Holders must surrender Securities to a Paying Agent to collect the principal amount, Redemption Price, Option Purchase Price or Fundamental Change Repurchase Price of the Securities, plus, if applicable, accrued and unpaid
interest, if any, payable as herein provided on the Maturity Date or upon Redemption, Purchase at Holder’s Option or Repurchase Upon Fundamental Change, as the case may be. The Company will pay, in money of the United States that at the time of
payment is legal tender for payment of public and private debts, all amounts due in cash with respect to the Securities, which amounts shall be paid (A) in the case this Security is in global form, by wire transfer of immediately available
funds to the account designated by the Depositary or its nominee; (B) in the case this Security is held, other than global form, by a Holder of more than five million dollars ($5,000,000) in aggregate principal amount of Securities, by wire
transfer of immediately available funds to the account specified by such Holder or, if such Holder does not specify an account, by mailing a check to the address of such Holder set forth in the register of the Registrar; and (C) in the case
this Security is held, other than global form, by a Holder of five million dollars ($5,000,000) or less in aggregate principal amount of Securities, by mailing a check to the address of such Holder set forth in the register of the Registrar.

 4. Paying Agent, Registrar, Conversion Agent. Initially, Wells Fargo Bank, National Association (the “Trustee”)
will act as Paying Agent, Registrar and Conversion Agent. The Company may change any Paying Agent, Registrar or Conversion Agent without notice. 
 5. Indenture. The Company issued the Securities under an Indenture dated as of March 28, 2007 (the “Indenture”) between the Company and the Trustee. The terms of the Securities include those stated in the
Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S. Code §§ 77aaa-77bbbb) (the “TIA”) as amended and in effect from time to time. The Securities are subject to all such
terms, and Holders are referred to the Indenture and the TIA for a statement of such terms. The Securities are general unsecured senior obligations of the Company limited to $100,000,000 aggregate principal amount 

  

 A-3 

 
($120,000,000 if the Initial Purchasers have elected to exercise in full the Option to purchase up to an additional $20,000,000 aggregate principal amount of
the Securities), except as otherwise provided in the Indenture (except for Securities issued in substitution for destroyed, mutilated, lost or stolen Securities). Terms used herein without definition and which are defined in the Indenture have the
meanings assigned to them in the Indenture. 
 6. Optional Redemption. 
 The Company shall have the right, at the Company’s option, at any time, and from time to time, on a Redemption Date on or after April 5, 2012,
to redeem all or any part of the Securities at a price payable in cash equal to one hundred percent (100%) of the principal amount of the Securities to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the Redemption
Date. 
 Upon surrender to the Paying Agent of a Security subject to Redemption, such Security shall be paid, to the Holder surrendering such
Security, at the Redemption Price plus accrued and unpaid interest to, but excluding, the Redemption Date, unless the Redemption Date is after a record date for the payment of an installment of interest and on or before the related interest payment
date, in which case accrued and unpaid interest to, but excluding, such interest payment date will be paid, on such interest payment date, to the Holder of record of such Security at the close of business on such record date, and the Holder
surrendering such Security shall not be entitled to any such interest unless such Holder was also the Holder of record of such Security at the close of business on such record date. The Company will make at least ten (10) semi-annual interest
payments with respect to the Securities prior to redeeming any Securities under this paragraph 6. 
 7. Notice of Redemption.
Notice of Redemption will be delivered at least thirty (30) days but not more than sixty (60) days before the Redemption Date to each Holder of Securities to be redeemed at its address appearing in the security register. Securities in
denominations larger than $1,000 principal amount may be redeemed in part but only in integral multiples of $1,000 principal amount. 
 8.
Purchase by the Company at the Option of the Holder. Subject to the terms and conditions of the Indenture, the Company shall become obligated to purchase, at the option of each Holder, the Securities held by such Holder on April 1,
2012, April 1, 2017 and April 1, 2022 (each, an “Option Purchase Date”) at an Option Purchase Price, payable in cash, equal to one hundred percent (100%) of the principal amount of the Securities to be purchased,
plus accrued and unpaid interest, if any, to, but excluding, the applicable Option Purchase Date, upon delivery of a Purchase Notice containing the information set forth in the Indenture, at any time from the opening of business on the date that is
twenty (20) Business Days prior to the applicable Option Purchase Date until the close of business on the Business Day immediately preceding the applicable Option Purchase Date and upon delivery of the Securities to the Paying Agent by the
Holder as set forth in the Indenture; provided, however, that that such accrued and unpaid interest shall be paid to the Holder of record of such Securities at the close of business on the record date immediately preceding such Option
Purchase Date 
  

 A-4 

 9. Repurchase at Option of Holder Upon a Fundamental Change. Subject to the terms and conditions
of the Indenture, in the event of a Fundamental Change, each Holder of the Securities shall have the right, at the Holder’s option, to require the Company to repurchase such Holder’s Securities including any portion thereof which is $1,000
in principal amount or any integral multiple thereof on a date selected by the Company (the “Fundamental Change Repurchase Date”), which date is no later than thirty five (35) days, nor earlier than twenty (20) days, after
the date on which notice of such Fundamental Change is delivered in accordance with the Indenture, at a price payable in cash equal to one hundred percent (100%) of the principal amount of such Security, plus accrued and unpaid interest to, but
excluding, the Fundamental Change Repurchase Date; provided, however, that if such Fundamental Change Repurchase Date is after a record date for the payment of an installment of interest and on or before the related interest payment
date, then the accrued and unpaid interest, if any, to, but excluding, such interest payment date will be paid on such interest payment date to the Holder of record of such Securities at the close of business on such record date, and the Holder
surrendering such Securities for repurchase will not be entitled to any such accrued and unpaid interest unless such Holder was also the Holder of record of such Securities at the close of business on such record date. 
 10. Conversion. 
 Subject to earlier
Redemption, Purchase at Holder’s Option or Repurchase Upon Fundamental Change, Holders may surrender Securities in integral multiples of $1,000 principal amount for conversion into shares of Common Stock in accordance with Article X of
the Indenture at any time prior to stated maturity. 
 Notwithstanding anything herein to the contrary, the right to convert the Securities
pursuant to Article X of the Indenture shall terminate at the close of business on the Business Day immediately preceding the Maturity Date. 
 To convert a Security, a Holder must (1) complete and sign the Conversion Notice, with appropriate signature guarantee, on the back of the Security, (2) surrender the Security to a Conversion Agent, (3) furnish appropriate
endorsements and transfer documents if required by the Registrar or Conversion Agent, (4) pay the amount of interest, if any, the Holder must pay in accordance with the Indenture and (5) pay any tax or duty if required pursuant to the
Indenture. A Holder may convert a portion of a Security if the portion is $1,000 principal amount or an integral multiple of $1,000 principal amount. To convert interests in a Global Security, a Holder must comply with DTC’s then applicable
conversion program procedures. 
 The initial Conversion Rate is 122.5490 shares of Common Stock per $1,000 principal amount of Securities
(which results in an effective initial Conversion Price of $8.16 per share) subject to adjustment in the event of certain circumstances as specified in the Indenture. The Company will deliver a check in lieu of any fractional share. On conversion,
no payment or adjustment for any unpaid and accrued interest or additional interest on the Securities will be made. If any Holder surrenders a Security for conversion after the close of business on the record date for the payment of an installment
of interest and prior to the related interest payment date, then, notwithstanding such conversion, the interest payable with respect to such Security on such interest payment date shall be paid on such interest payment date to the Holder of record
of such Security at the close of business on such record date; provided, 

  

 A-5 

 
however, that such Security, when surrendered for conversion, must be accompanied by payment to the Conversion Agent on behalf of the Company of an
amount equal to the interest payable on such interest payment date on the portion so converted unless either (i) such Security is called for Redemption pursuant to Section 3.04 of the Indenture and paragraphs 6 and 7 hereof;
(ii) the Company shall have, in respect of a Fundamental Change, specified a Fundamental Change Repurchase Date which is after such record date and on or before such interest payment date; or (iii) such Security is surrendered for
conversion after the close of business on the record date immediately preceding the Maturity Date; provided further, however, that, if the Company shall have, prior to the Conversion Date with respect to a Security, defaulted in a payment of
interest on such Security, then in no event shall the Holder of such Security who surrenders such Security for conversion be required to pay such defaulted interest or the interest that shall have accrued on such defaulted interest pursuant to
Section 2.12 of the Indenture or otherwise (it being understood that nothing in paragraph shall affect the Company’s obligations under Section 2.12 of the Indenture). 
 The Conversion Rate may be increased on April 1, 2008, pursuant to Section 10.15 of the Indenture, if the arithmetic average of the
daily Volume Weighted Average Price per share of Common Stock for each of the 20 consecutive Trading Days ending on April 1, 2008 is less than the Floor Price. 
 The Conversion Rate applicable to each Security that is surrendered for conversion, in accordance with the Securities and Article X of the Indenture, at any time during the Make-Whole Conversion Period with
respect to a Make-Whole Fundamental Change shall be increased to an amount equal to the Conversion Rate that would, but for Section 10.16 of the Indenture, otherwise apply to such Security pursuant to Article X of the Indenture,
plus an amount equal to the Make-Whole Applicable Increase; provided, however, that such increase to the Conversion Rate shall not apply if such Make-Whole Fundamental Change is announced by the Company but shall not be consummated.

 11. Denominations, Transfer, Exchange. The Securities are in registered form, without coupons, in denominations of $1,000 principal
amount and integral multiples of $1,000 principal amount. The transfer of Securities may be registered and Securities may be exchanged as provided in the Indenture. The Registrar may require a Holder, among other things, to furnish appropriate
endorsements and transfer documents. No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or similar governmental charge that may be imposed in
connection with certain transfers or exchanges. The Company or the Trustee, as the case may be, shall not be required to register the transfer of or exchange any Security (i) during a period beginning at the opening of business fifteen
(15) days before the delivery of a notice of redemption of the Securities selected for Redemption under Section 3.04 of the Indenture and ending at the close of business on the day of such delivery or (ii) for a period of
fifteen (15) days before selecting, pursuant to Section 3.03 of the Indenture, Securities to be redeemed or (iii) that has been selected for Redemption or for which a Purchase Notice has been delivered, and not withdrawn, in
accordance with the Indenture, except the unredeemed or unrepurchased portion of Securities being redeemed or repurchased in part. 
  

 A-6 

 12. Persons Deemed Owners. The registered Holder of a Security may be treated as the owner of such
Security for all purposes. 
 13. Merger or Consolidation. The Company shall not consolidate with, or merge with or into, or sell,
transfer, lease, convey or otherwise dispose of all or substantially all of the property or assets of the Company, or of the Company and the Subsidiaries on a consolidated basis, to, another person, whether in a single transaction or series of
related transactions, unless (i) if the surviving person is not the Company, the surviving person is a corporation organized and existing under the laws of the United States, any State thereof or the District of Columbia; (ii) such person
assumes by supplemental indenture all the obligations of the Company under the Securities and the Indenture; and (iii) immediately after giving effect to the transaction, no Default or Event of Default shall exist. 
 14. Amendments, Supplements and Waivers. Subject to certain exceptions, the Indenture or the Securities may be amended or supplemented with the
consent of the Holders of at least a majority in aggregate principal amount of the outstanding Securities, and certain existing Defaults or Events of Default may be waived with the consent of the Holders of a majority in aggregate principal amount
of the Securities then outstanding. In accordance with the terms of the Indenture, the Company, with the consent of the Trustee, may amend or supplement this Indenture or the Securities without notice to or the consent of any Securityholder:
(i) to comply with Sections 5.01 and 10.12 of the Indenture; (ii) to make any changes or modifications to the Indenture necessary in connection with the registration of the Securities under the Securities Act pursuant to the
Registration Rights Agreement or the qualification of the Indenture under the TIA; (iii) to secure the obligations of the Company in respect of the Securities; (iv) to add to the covenants of the Company described in the Indenture for the
benefit of Securityholders or to surrender any right or power conferred upon the Company; and (v) to make provisions with respect to adjustments to the Conversion Rate as required by the Indenture or to increase the Conversion Rate in
accordance with the Indenture. In addition, the Company and the Trustee may enter into a supplemental indenture without the consent of Holders of the Securities to (i) cure any ambiguity, defect, omission or inconsistency in the Indenture in a
manner that does not, individually or in the aggregate with all other modifications made or to be made to the Indenture, adversely affect the rights of any Holder in any material respect; or (ii) conform the Indenture to the description of the
Securities contained in the Offering Memorandum of the Company, dated March 22, 2007. 
 15. Defaults and Remedies. 

If an Event of Default (excluding an Event of Default specified in Section 6.01(viii) or (ix) of the Indenture with respect to
the Company (but including an Event of Default specified in Section 6.01(viii) or (ix) of the Indenture solely with respect to a Significant Subsidiary of the Company or any group of Subsidiaries that in the aggregate would
constitute a Significant Subsidiary of the Company)) occurs and is continuing, the Trustee by notice to the Company or the Holders of at least twenty five percent (25%) in principal amount of the Securities then outstanding by notice to the
Company and the Trustee may declare the Securities to be due and payable. Upon such declaration, the principal of, and any accrued and unpaid interest (including any additional interest) on, all Securities shall be due and payable immediately. If an
Event of Default specified in Section 6.01(viii) or (ix) of the Indenture with 

  

 A-7 

 
respect to the Company (excluding, for purposes of this sentence, an Event of Default specified in Section 6.01(viii) or (ix) of the
Indenture solely with respect to a Significant Subsidiary of the Company or any group of Subsidiaries that in the aggregate would constitute a Significant Subsidiary of the Company) occurs, the principal of, and accrued and unpaid interest
(including any additional interest) on, all the Securities shall ipso facto become and be immediately due and payable without any declaration or other act on the part of the Trustee or any Holder. The Holders of a majority in aggregate
principal amount of the Securities then outstanding by written notice to the Trustee may rescind or annul an acceleration and its consequences if (A) the rescission would not conflict with any order or decree, (B) all existing Events of
Default, except the nonpayment of principal or interest (including additional interest) that has become due solely because of the acceleration, have been cured or waived and (C) all amounts due to the Trustee under Section 7.07 of
the Indenture have been paid. 
 Pursuant to Section 6.02 of the Indenture, notwithstanding the foregoing, at the election of the
Company, the sole remedy for an Event of Default specified in Section 6.01(v) of the Indenture relating to the failure by the Company to comply with its obligations under Section 4.03 of the Indenture and for any failure by
the Company to comply with the requirements of Section 314(a)(1) of the Trust Indenture Act, shall for the first 60 days after the occurrence of such an Event of Default consist exclusively of the right to receive special interest on the
Securities at an annual rate equal to 0.25% of the principal amount of the outstanding Securities. In no event shall such special interest, together with any additional interest payable pursuant to the Registration Rights Agreement, accrue at an
aggregate rate exceeding 0.50% per annum. 
 Holders may not enforce the Indenture or the Securities except as provided in the
Indenture. The Holders of a majority in aggregate principal amount of the Securities then outstanding may 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 it. However, the Trustee may refuse to follow any direction that conflicts with law or the Indenture, is unduly prejudicial to the rights of other Holders or would involve the Trustee in personal liability unless the Trustee is offered
indemnity reasonably satisfactory to it; provided, that the Trustee may take any other action deemed proper by the Trustee which is not inconsistent with such direction. 
 If a Default or Event of Default occurs and is continuing as to which the Trustee has received notice pursuant to the provisions of the Indenture, or as
to which a Responsible Officer of the Trustee shall have actual knowledge, the Trustee shall deliver to each Holder a notice of the Default or Event of Default within thirty (30) days after it occurs unless such Default or Event of Default has
been cured or waived. Except in the case of a Default or Event of Default in payment of any amounts due with respect to any Security, the Trustee may withhold the notice if, and so long as it in good faith determines that, withholding the notice is
in the best interests of Holders. The Company must deliver to the Trustee an annual compliance certificate. 
 16. Registration
Rights. The Holders are entitled to registration rights as set forth in the Registration Rights Agreement. The Holders shall be entitled to receive additional interest in certain circumstances, all as set forth in the Registration Rights
Agreement. 
  

 A-8 

 17. Trustee Dealings with the Company. The Trustee under the Indenture, or any banking institution
serving as successor Trustee thereunder, in its individual or any other capacity, may make loans to, accept deposits from, and perform services for, the Company or its Affiliates, and may otherwise deal with the Company or its Affiliates, as if it
were not Trustee. 
 18. No Recourse Against Others. No past, present or future director, officer, employee or stockholder, as such,
of the Company shall have any liability for any obligations of the Company under the Securities or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder, by accepting a Security,
waives and releases all such liability. The waiver and release are part of the consideration for the issue of the Securities. 
 19.
Authentication. This Security shall not be valid until authenticated by the manual signature of the Trustee or an authenticating agent in accordance with the Indenture. 
 20. Abbreviations. Customary abbreviations may be used in the name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (=
tenants by the entirety), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (Uniform Gifts to Minors Act). 
 THE COMPANY WILL FURNISH TO ANY HOLDER UPON WRITTEN REQUEST AND WITHOUT CHARGE A COPY OF THE INDENTURE. REQUESTS MAY BE MADE TO: 
 Diversa Corporation 
 4955 Directors Place 
 San Diego, CA 92121 
 Attn: Chief Financial Officer 
  

 A-9 

 [FORM OF ASSIGNMENT] 
 I or we assign to 
 PLEASE INSERT SOCIAL SECURITY OR 
 OTHER IDENTIFYING NUMBER 
  

			
	  
	  	
	
	  

	(please print or type name and address)
	
	  

	
	  

	
	the within Security and all rights thereunder, and hereby irrevocably constitute and appoint
	
	  

	
	Attorney to transfer the Security on the books of the Company with full power of substitution in the premises.

					
			
	 Dated:
	 	  
	  	  

			
		 		  	NOTICE: The signature on this assignment must correspond with the name as it appears upon the face of the within Security in every particular without alteration or enlargement or any change
whatsoever and be guaranteed by a guarantor institution participating in the Securities Transfer Agents Medallion Program or in such other guarantee program acceptable to the Trustee.

					
		
	 Signature Guarantee:
	 	  

  

 A-10 

 In connection with any transfer of this Security occurring prior to the date which is the earlier of (i) the date of
the declaration by the SEC of the effectiveness of a registration statement under the Securities Act of 1933, as amended, covering resales of this Security (which effectiveness shall not have been suspended or terminated at the date of the transfer)
and (ii) the Resale Restriction Termination Date, the undersigned confirms that it is making, and it has not utilized any general solicitation or general advertising in connection with, the transfer: 
 [Check One] 
  

			
	 (1)            
	  	to the Company or any Subsidiary thereof, or
		
	 (2)            
	  	pursuant to, and in compliance with, the exemption from registration provided by Rule 144A under the Securities Act of 1933, as amended, or
		
	 (3)            
	  	pursuant to, and in compliance with, the exemption from registration provided by Rule 144 under the Securities Act of 1933, as amended, or
		
	 (4)            
	  	pursuant to, and in compliance with, an exemption from registration under the Securities Act of 1933, as amended, other than Rule 144A or Rule 144, or
		
	 (5)            
	  	pursuant to an effective registration statement under the Securities Act of 1933, as amended,

 and, unless the box below is checked, the undersigned confirms that this Security is not being transferred to an
“affiliate” of the Company (an “Affiliate”) as defined in Rule 144 under the Securities Act of 1933, as amended: 
  ̈  The transferee is an Affiliate of the Company. (If the Security is transferred to an Affiliate, the restrictive legend
must remain on the Security for at least two (2) years following the date of the transfer.) 
 Unless one of the items (1) through (5) is
checked, the Trustee will refuse to register any of the Securities evidenced by this certificate in the name of any person other than the registered Holder thereof; provided, however, that if item (3) or (4) is checked, the
Company or the Trustee may require, prior to registering any such transfer of the Securities, in their sole discretion, such written legal opinions, certifications and other information as the Trustee or the Company have reasonably requested to
confirm that such transfer is being made pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act of 1933, as amended. If item (2) is checked, the purchaser must complete the
certification below. 
 If none of the foregoing items are checked, the Trustee or Registrar shall not be obligated to register this Security in the name of
any person other than the Holder hereof unless and until the conditions to any such transfer of registration set forth herein and in the Indenture shall have been satisfied. 
  

									
	 Dated:
	 	  
	 		 	Signed:	 	  

		 		 		 		 	(Sign exactly as name appears on the other side of this Security)

  

			
	 Signature Guarantee:
	 	  

  

 A-11 

 TO BE COMPLETED BY PURCHASER IF (2) ABOVE IS CHECKED 
 The undersigned represents and warrants that it is purchasing this Security for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a
“qualified institutional buyer” within the meaning of Rule 144A under the Securities Act of 1933, as amended, and is aware that the sale to it is being made in reliance on Rule 144A and acknowledges that it has received such information
regarding the Company as the undersigned has requested pursuant to Rule 144A and acknowledges that the transferor is relying upon the undersigned’s foregoing representations in order to claim the exemption from registration provided by Rule
144A. 
  

							
	 Dated:
	 	  
	 		 	  

		 		 		 	NOTICE: To be executed by an executive officer

  

 A-12 

 CONVERSION NOTICE 
 To convert this Security in accordance with the Indenture, check the box:  ̈ 
 To convert only part of this Security, state the principal amount to be converted (must be in multiples of $1,000): 
 $                                     
 If you want the stock certificate made out in another person’s name, fill in the form below: 
  

	
	  

	(Insert other person’s soc. sec. or tax I.D. no.)
	
	  

	
	  

	
	  

	
	  

	(Print or type other person’s name, address and zip code)

  

											
	 Date:
	 	  
	 	Signature(s):	 	  

				
		 		 		 	  

		 		 		 	 (Sign exactly as your name(s) appear(s) on the other side of this Security)

											
		
	 Signature(s) guaranteed by:
	 	  

		 	(All signatures must be guaranteed by a guarantor institution participating in the Securities Transfer Agents Medallion Program or in such other guarantee program acceptable to the
Trustee.)

  

 A-13 

 PURCHASE NOTICE 
 Certificate No. of Security:                      
 If you want to elect to have this Security purchased by the Company pursuant to Section 3.08 of the Indenture, check the box:   ̈ 
 If you want to elect to have this Security purchased by the Company
pursuant to Section 3.09 of the Indenture, check the box:   ̈ 
 If you want to elect to have only part of this Security purchased by the Company pursuant to Sections 3.08 or 3.09 of the Indenture, as
applicable, state the principal amount to be so purchased by the Company: 
 $
                                        
                                     
     (in an integral multiple of $1,000) 
  

									
	 Date:
	 	  
	 		 	Signature(s):	 	  

				
		 		 		 	  

		 		 		 	Sign exactly as your name(s) appear(s) on the other side of this Security)

  

					
	 Signature(s) guaranteed by:
	 		  	  

		 		  	(All signatures must be guaranteed by a guarantor institution participating in the Securities Transfer Agents Medallion Program or in such other guarantee program acceptable to the
Trustee.)

  

 A-14 

 SCHEDULE A 
 SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL SECURITYa 
 The following exchanges of a part of
this Global Security for an interest in another Global Security or for Securities in certificated form, have been made: 
  

									
	 Date of Exchange
	 	 Amount of decrease in
Principal amount of this
Global
Security
	 	 Amount of Increase in
Principal amount of this
Global
Security
	 	 Principal amount of this
Global
 Security following
 such
decrease
 or increase
	 	 Signature or authorized
signatory of Trustee or
Note
Custodian

	 a
	 This is included in Global Securities only. 

  

 A-15 

 EXHIBIT B-1 
 FORM OF PRIVATE PLACEMENT LEGEND 
 THIS SECURITY AND THE COMMON STOCK 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 THAT IT WILL NOT DIRECTLY OR INDIRECTLY ENGAGE IN ANY HEDGING TRANSACTIONS INVOLVING THIS SECURITY OR THE COMMON STOCK ISSUABLE UPON CONVERSION
OF THIS SECURITY UNLESS IN COMPLIANCE WITH THE SECURITIES ACT, AND 
 (3) AGREES FOR THE BENEFIT OF 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) TWO YEARS AFTER THE LATER OF THE ORIGINAL ISSUE DATE HEREOF AND THE LAST DATE ON WHICH THE COMPANY OR ANY AFFILIATE OF THE
COMPANY WAS THE OWNER OF THIS SECURITY (OR ANY PREDECESSOR OF THIS SECURITY) OR SUCH SHORTER PERIOD OF TIME AS PERMITTED BY RULE 144(K) UNDER THE SECURITIES ACT OR ANY SUCCESSOR PROVISION THEREUNDER, AND (Y) SUCH LATER DATE, IF ANY, AS MAY BE
REQUIRED BY APPLICABLE LAW, EXCEPT ONLY 
  

	 	(A)	TO THE COMPANY OR ANY SUBSIDIARY THEREOF, 

  

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

  

	 	(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 (3)(C) ABOVE, A DULY COMPLETED AND SIGNED CERTIFICATE (THE
FORM OF WHICH MAY BE OBTAINED FROM THE TRUSTEE) MUST BE DELIVERED TO THE TRUSTEE. PRIOR TO THE REGISTRATION OF ANY TRANSFER IN ACCORDANCE WITH (3)(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 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. 
  

 B-1-1 

 THIS SECURITY SHALL BE ENTITLED TO THE BENEFITS OF THAT CERTAIN REGISTRATION RIGHTS AGREEMENT, DATED
MARCH 28, 2007, AMONG DIVERSA CORPORATION AND THE OTHER PARTIES NAMED THEREIN. 
  

 B-1-2 

 EXHIBIT B-2 
 FORM OF LEGEND FOR GLOBAL SECURITY 
 Any Global Security authenticated and delivered hereunder shall bear a
legend (which would be in addition to any other legends required in the case of a Restricted Security) in substantially the following form: 
 THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE OF A DEPOSITARY OR A SUCCESSOR DEPOSITARY. THIS SECURITY IS NOT
EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND NO TRANSFER OF THIS SECURITY (OTHER THAN A TRANSFER OF THIS SECURITY AS A
WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY) MAY BE REGISTERED EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE. 
 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 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. 
 TRANSFERS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO
TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF CEDE & CO. OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR’S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE
RESTRICTIONS SET FORTH IN SECTION 2.16 OF THE INDENTURE. 
  

 B-2-1 

 EXHIBIT C 
 Form of Notice of Transfer Pursuant to Registration Statement 
 Diversa Corporation 
 4955 Directors Place 
 San Diego, CA 92121 
 Attention: Chief Financial Officer 
 Wells Fargo Bank, National Association

 Corporate Trust Services 
 MAC N9303-120 
 680—2nd Avenue South 
 Minneapolis, MN 55479 
 Attention: Diversa Corporation Account Manager 
 Re: Diversa Corporation (the
“Company”) 5.50% Convertible Senior Notes due 2027 (the “Securities”) 
 Ladies and Gentlemen: 
 Please be advised that _____________ has transferred $___________ aggregate principal amount of the Securities and ________ shares of the Common Stock,
$0.001 par value per share, of the Company issued on conversion of the Securities (“Stock”) pursuant to an effective Shelf Registration Statement on Form S-3 (File No. 333-________). 
 We hereby certify that the prospectus delivery requirements, if any, of the Securities Act of 1933 as amended, have been satisfied with respect to the
transfer described above and that the above-named beneficial owner of the Securities or Stock is named as a “Selling Security Holder” in the Prospectus dated _________, or in amendments or supplements thereto, and that the aggregate
principal amount of the Securities and the number of shares of Stock transferred are [a portion of] the Securities and Stock listed in such Prospectus, as amended or supplemented, opposite such owner’s name. 
 Very truly yours, 
  

	
	 (Name)

  

 C-1Registration Rights Agreement

 Exhibit 4.2 
  

 
 Diversa Corporation 
 REGISTRATION RIGHTS AGREEMENT 
  
  
 March 28, 2007

  

 REGISTRATION RIGHTS AGREEMENT 
 THIS REGISTRATION RIGHTS AGREEMENT (the “Agreement”) is made and entered
into as of March 28, 2007, by and among Diversa Corporation, a Delaware corporation (the “Company”), and UBS Securities LLC and the other Initial Purchasers named in the Purchase Agreement referred to below (collectively, the
“Initial Purchasers”) pursuant to that certain Purchase Agreement, dated March 22, 2007 (the “Purchase Agreement”), among the Company and the Initial Purchasers. 
 In order to induce the Initial Purchasers to enter into the Purchase Agreement, the Company has agreed to provide the registration rights set forth in
this Agreement. The execution of this Agreement is a condition to the closing under the Purchase Agreement. The terms “herein,” “hereof,” “hereto,” “hereinafter” and similar terms, as used in this Agreement,
shall in each case refer to this Agreement as a whole and not to any particular section, paragraph, sentence or other subdivision of this Agreement. 
 The Company agrees with the Initial Purchasers (i) for their benefit as Initial Purchasers and (ii) for the benefit of the beneficial owners (including the Initial Purchasers) from time to time of the
Covered Securities (as defined herein) (each of the foregoing a “Holder” and, together, the “Holders”), as follows: 
 1. Definitions. Capitalized terms used herein without definition shall have the respective meanings set forth in the Purchase Agreement. As used in this Agreement, the following terms shall have the following
meanings: 
 (a) “Additional Filing Deadline Date” has the meaning set forth in Section 2(e) hereof.

 (b) “additional interest” has the meaning set forth in Section 2(e) hereof. 
 (c) “Additional Interest Accrual Period” has the meaning set forth in Section 2(e) hereof. 
 (d) “Additional Interest Amount” has the meaning set forth in Section 2(e) hereof. 
 (e) “Additional Interest Payment Date” means each April 1 and October 1 of each year. 
 (f) “Affiliate” means, with respect to any specified person, an “affiliate,” as defined in Rule 144, of such
person. 
 (g) “Amendment Effectiveness Deadline Date” has the meaning set forth in Section 2(d) hereof.

 (h) “Business Day” means each day on which the New York Stock Exchange is open for trading. 
  

 1 

 (i) “Claim” has the meaning set forth in Section 9(o) hereof.

 (j) “Common Stock” means the shares of common stock, $0.001 par value per share, of the Company and any
other shares of capital stock as may constitute “Common Stock” for purposes of the Indenture, including the Underlying Common Stock. 
 (k) “Conversion Rate” has the meaning ascribed to it in the Indenture. 
 (l)
“Covered Security” has the meaning set forth in Section 1(rr) hereof. 
 (m) “Designated
Counsel” means one (1) counsel, if any, for the Holders in connection with the Shelf Registration Statement, which Designated Counsel shall be designated in writing to the Company by Holders of a majority of the Registrable Securities.

 (n) “Effectiveness Deadline Date” has the meaning set forth in Section 2(a) hereof. 
 (o) “Effectiveness Period” means a period (subject to extension pursuant to Section 3(i) hereof) that terminates
when there are no Registrable Securities outstanding. 
 (p) “Event” has the meaning set forth in
Section 2(e) hereof. 
 (q) “Event Date” has the meaning set forth in Section 2(e) hereof.

 (r) “Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations of
the SEC promulgated thereunder. 
 (s) “Filing Deadline Date” has the meaning set forth in Section 2(a)
hereof. 
 (t) “Form S-1” means Form S-1 under the Securities Act. 
 (u) “Form S-3” means Form S-3 under the Securities Act. 
 (v) “Holder” has the meaning set forth in the preamble hereto. 
 (w) “Holder Information” has the meaning set forth in Section 6(b) hereof. 
 (x) “Indemnified Party” has the meaning set forth in Section 6(c) hereof. 
 (y) “Indemnifying Party” has the meaning set forth in Section 6(c) hereof. 
 (z) “Indenture” means the Indenture, dated as of March 28, 2007, between the Company and the Trustee, pursuant to
which the Notes are being issued. 
  

 2 

 (aa) “Initial Purchasers” has the meaning set forth in the preamble
hereto. 
 (bb) “Initial Shelf Registration Statement” has the meaning set forth in Section 2(a) hereof.

 (cc) “Issue Date” means March 28, 2007. 
 (dd) “Managing Underwriters” has the meaning set forth in Section 8(a) hereof. 
 (ee) “Material Event” has the meaning set forth in Section 3(i) hereof. 
 (ff) “NASD Rules” has the meaning set forth in Section 3(s) hereof. 
 (gg) “Notes” means the 5.50% Convertible Senior Notes due 2027 of the Company to be purchased pursuant to the Purchase
Agreement. 
 (hh) “Notice and Questionnaire” means a written questionnaire containing substantially the
information called for by the Selling Securityholder Notice and Questionnaire attached as Annex A to the Offering Memorandum of the Company, dated March 22, 2007, relating to the Notes. 
 (ii) “Notice Holder” means, on a given date, any Holder that has delivered a Notice and Questionnaire to the Company on
or prior to such date, provided not all of such Holder’s Registrable Securities that have been registered for resale pursuant to a Notice and Questionnaire have been sold in accordance with a Shelf Registration Statement. 
 (jj) “Option Purchase Date” has the meaning ascribed to it in the Indenture. 
 (kk) “Proceeding” has the meaning set forth in Section 6(c) hereof. 
 (ll) “Prospectus” means the prospectus included in any Shelf Registration Statement (including, without limitation, a
prospectus that discloses information previously omitted from a prospectus filed as part of an effective registration statement in reliance upon Rule 415 under the Securities Act), as amended or supplemented by any amendment or prospectus
supplement, including post-effective amendments and any prospectus filed with respect to any Shelf Registration Statement pursuant to Rule 424 under the Securities Act, and all materials incorporated by reference or deemed to be incorporated by
reference in such Prospectus. 
 (mm) “Purchase Agreement” has the meaning set forth in the preamble hereof.

 (nn) “Record Date” means, (i) March 15, with respect to an Additional Interest Payment Date that
occurs on April 1 and (ii) September 15, with respect to an Additional Interest Payment Date that occurs on October 1. 
  

 3 

 (oo) “Record Holder” means, with respect to an Additional Interest
Payment Date relating to a Registrable Security for which any Additional Interest Amount has accrued, a Notice Holder that was the holder of record of such Registrable Security at the close of business on the Record Date relating to such Additional
Interest Payment Date. 
 (pp) “Redemption” has the meaning ascribed to it in the Indenture. 
 (qq) “Redemption Date” has the meaning ascribed to it in the Indenture. 
 (rr) “Registrable Securities” means the Notes, until such Notes have been converted into the Underlying Common Stock,
and, at all times, the Underlying Common Stock and any securities into or for which such Underlying Common Stock has been converted or exchanged, and any security issued with respect thereto upon any stock dividend, split or similar event (each of
the foregoing, a “Covered Security”) until, in the case of any such security, the earliest of: 
 (i) the
date on which such security has been effectively registered under the Securities Act and disposed of in accordance with the Registration Statement relating thereto; 
 (ii) the date on which such security may be resold without restriction pursuant to Rule 144(k) or any successor provision thereto; or

 (iii) the date on which such security has been publicly sold pursuant to Rule 144 or any successor provision thereto.

 (ss) “Registration Expenses” has the meaning set forth in Section 5 hereof. 
 (tt) “Registration Statement” means any registration statement, under the Securities Act, of the Company that covers any
of the Registrable Securities pursuant to this Agreement, including the Prospectus, amendments and supplements to such registration statement, including post-effective amendments, all exhibits and all materials incorporated by reference or deemed to
be incorporated by reference in such registration statement, Prospectus, amendment or supplement. 
 (uu) “Repurchase
at Holder’s Option” has the meaning ascribed to it in the Indenture. 
 (vv) “Repurchase Date”
has the meaning ascribed to it in the Indenture. 
 (ww) “Repurchase Upon Repurchase Event” has the meaning
ascribed to it in the Indenture. 
 (xx) “Rule 144” means Rule 144 under the Securities Act, as such Rule may
be amended from time to time, or any similar rule or regulation hereafter adopted by the SEC. 
  

 4 

 (yy) “Rule 144A” means Rule 144A under the Securities Act, as such Rule
may be amended from time to time, or any similar rule or regulation hereafter adopted by the SEC. 
 (zz)
“SEC” means the Securities and Exchange Commission. 
 (aaa) “Securities Act” means the
Securities Act of 1933, as amended, and the rules and regulations promulgated by the SEC thereunder. 
 (bbb) “Shelf
Registration Statement” means the Initial Shelf Registration Statement and any Subsequent Shelf Registration Statement. 
 (ccc) “Subsequent Shelf Registration Statement” has the meaning set forth in Section 2(b) hereof. 
 (ddd) “Subsequent Shelf Registration Statement Effectiveness Deadline Date” has the meaning set forth in Section 2(d) hereof. 
 (eee) “Suspension Notice” has the meaning set forth in Section 3(i) hereof. 
 (fff) “Suspension Period” has the meaning set forth in Section 3(i) hereof. 
 (ggg) “TIA” means the Trust Indenture Act of 1939, as amended. 
 (hhh) “Trustee” means Wells Fargo Bank, N.A., the trustee under the Indenture. 
 (iii) “Underlying Common Stock” means the Common Stock issuable upon conversion of the Notes. 
 2. Shelf Registration. 
 (a) The Company shall prepare and file, or cause to be prepared and filed, with the SEC, as soon as reasonably practicable but in any event by the date (the “Filing Deadline Date”) that is ninety (90) days after the
Issue Date, a Registration Statement (the “Initial Shelf Registration Statement”) for an offering to be made on a delayed or continuous basis pursuant to Rule 415 under the Securities Act registering the resale from time to time by
Holders thereof of all of the Registrable Securities (or, if registration of Registrable Securities not held by Notice Holders is not permitted by the rules and regulations of the SEC, then registering the resale from time to time by Notice Holders
of their Registrable Securities). The Initial Shelf Registration Statement shall be on Form S-1 or Form S-3 or another appropriate form and shall provide for the registration of such Registrable Securities for resale by such Holders in accordance
with any reasonable method of distribution elected by the Holders. The Company shall use its reasonable best efforts to (i) cause the Initial Shelf Registration Statement to become effective under the Securities Act as soon as reasonably
practicable but in any event by the date (the “Effectiveness Deadline Date”) that is one hundred eighty (180) days after the Issue Date and (ii) keep the Initial Shelf Registration Statement (and any Subsequent Shelf
Registration Statement) continuously effective under the Securities Act until the expiration of the Effectiveness Period. At the time the Initial Shelf Registration Statement becomes effective under the Securities Act, each Holder that became a
Notice Holder on or before the 5th Business Day before the date of such effectiveness shall be named as a selling securityholder in the Initial Shelf Registration Statement and the related Prospectus in such a manner as to permit such Holder to
deliver such Prospectus to purchasers of Registrable Securities in accordance with applicable law. 
  

 5 

 (b) If any Shelf Registration Statement ceases to be effective under the Securities Act
for any reason at any time during the Effectiveness Period, the Company shall use its reasonable best efforts to promptly cause such Shelf Registration Statement to become effective under the Securities Act (including obtaining the prompt withdrawal
of any order suspending the effectiveness of such Shelf Registration Statement), and in any event shall, within fifteen (15) days of such cessation of effectiveness, (i) amend such Shelf Registration Statement in a manner reasonably
expected to obtain the withdrawal of any order suspending the effectiveness of such Shelf Registration Statement or (ii) file an additional Registration Statement (a “Subsequent Shelf Registration Statement”) for an offering to
be made on a delayed or continuous basis pursuant to Rule 415 of the Securities Act registering the resale from time to time by Holders thereof of all securities that are Registrable Securities as of the time of such filing (or, if registration of
Registrable Securities not held by Notice Holders is not permitted by the rules and regulations of the SEC, then registering the resale from time to time by Notice Holders of their securities that are Registrable Securities as of the time of such
filing). If a Subsequent Shelf Registration Statement is filed, the Company shall use its reasonable best efforts to (A) cause such Subsequent Shelf Registration Statement to become effective under the Securities Act as promptly as is
reasonably practicable after such filing, but in no event later than the Subsequent Shelf Registration Statement Effectiveness Deadline Date and (B) keep such Subsequent Shelf Registration Statement (or another Subsequent Shelf Registration
Statement) continuously effective until the end of the Effectiveness Period. Any such Subsequent Shelf Registration Statement shall be on Form S-1 or Form S-3 or another appropriate form and shall provide for the registration of such Registrable
Securities for resale by such Holders in accordance with any reasonable method of distribution elected by the Holders. 
 (c)
The Company shall supplement and amend any Shelf Registration Statement if required by the rules, regulations or instructions applicable to the registration form used by the Company for such Shelf Registration Statement, if required by the
Securities Act or as reasonably requested by the Initial Purchasers or by the Trustee on behalf of the Holders of the Registrable Securities covered by such Shelf Registration Statement. 
 (d) 
  

 6 

 (i) Each Holder of Registrable Securities agrees that, if such Holder wishes to sell
Registrable Securities pursuant to a Shelf Registration Statement and related Prospectus, it will do so only in accordance with this Section 2(d) and Section 3(i). Each Holder of Registrable Securities wishing to sell Registrable
Securities pursuant to a Shelf Registration Statement and related Prospectus agrees to deliver a completed and executed Notice and Questionnaire to the Company prior to any attempted or actual distribution of Registrable Securities under a Shelf
Registration Statement. If a Holder becomes a Notice Holder after the 5th Business Day before the date the Initial Shelf Registration Statement becomes effective under the Securities Act, the Company shall, as promptly as is reasonably practicable
after the date such Holder became a Notice Holder, and in any event, subject to clause (B) below, within the later of (x) thirty (30) Business Days after such date or (y) thirty (30) Business Days after the expiration of any
Suspension Period that either (I) is in effect when such Holder became a Notice Holder or (II) is put into effect within five (5) Business Days after the date such Holder became a Notice Holder, 
 (A) if required by applicable law, file with the SEC a supplement to the related Prospectus or a post-effective amendment to the Shelf
Registration Statement or file with the SEC a Subsequent Shelf Registration Statement and any necessary supplement or amendment to any document incorporated therein by reference and file any other required document with the SEC so that such Notice
Holder is named as a selling securityholder in a Shelf Registration Statement and the related Prospectus in such a manner as to permit such Notice Holder to deliver a Prospectus to purchasers of the Registrable Securities in accordance with
applicable law; provided, however, that, if a post-effective amendment or a Subsequent Shelf Registration Statement is required by the rules and regulations of the SEC in order to permit resales by such Notice Holder, the Company shall
not be required to file more than one (1) supplement to the related Prospectus, post-effective amendment or Subsequent Shelf Registration Statement for such purpose in any thirty (30) day period; 
 (B) if, pursuant to Section 2(d)(i)(A), the Company shall have filed a post-effective amendment to the Shelf Registration Statement
or filed a Subsequent Shelf Registration Statement, the Company shall use its reasonable best efforts to cause such post-effective amendment or Subsequent Shelf Registration Statement, as the case may be, to become effective under the Securities Act
as promptly as is reasonably practicable, but in any event by the date (the “Amendment Effectiveness Deadline Date,” in the case of a post-effective amendment, and the “Subsequent Shelf Registration Statement Effectiveness
Deadline Date,” in the case of a Subsequent Shelf Registration Statement) that is thirty (30) days after the date such post-effective amendment or Subsequent Shelf Registration Statement, as the case may be, is required by this
Section 2(d) to be filed with the SEC; 
  

 7 

 (C) the Company shall provide such Notice Holder a reasonable number of copies of any
documents filed pursuant to clause (A) above upon written request by such Notice Holder; 
 (D) the Company shall notify
such Notice Holder as promptly as is reasonably practicable after the effectiveness under the Securities Act of any post-effective amendment or Subsequent Shelf Registration Statement filed pursuant to clause (A) above; 
 (E) if such Holder became a Notice Holder during a Suspension Period, or a Suspension Period is put into effect within five
(5) Business Days after the date such Holder became a Notice Holder, the Company shall so inform such Notice Holder and shall take the actions set forth in clauses (A), (B), (C) and (D) above within thirty (30) Business Days
after expiration of such Suspension Period in accordance with Section 3(i); and 
 (F) if, under applicable law, the
Company has more than one option as to the type or manner of making any such filing, the Company shall make the required filing or filings in the manner or of a type that is reasonably expected to result in the earliest availability of a Prospectus
for effecting resales of Registrable Securities. 
 (ii) Notwithstanding anything contained herein to the contrary, the
Company shall be under no obligation to name any Holder that is not a Notice Holder as a selling securityholder in any Shelf Registration Statement or related Prospectus; provided, however, that any Holder that becomes a Notice Holder
(regardless of when such Holder became a Notice Holder) shall be named as a selling securityholder in a Shelf Registration Statement or related Prospectus in accordance with the requirements of this Section 2(d) or Section 2(a), as
applicable. 
 (e) The parties hereto agree that the Holders of Registrable Securities will suffer damages, and that it would
not be feasible to ascertain the extent of such damages with precision, if: 
 (i) the Initial Shelf Registration Statement
has not been filed with the SEC on or prior to the Filing Deadline Date; 
 (ii) the Initial Shelf Registration Statement has
not become effective under the Securities Act on or prior to the Effectiveness Deadline Date; 
  

 8 

 (iii) either a supplement to a Prospectus, a post-effective amendment or a Subsequent
Shelf Registration Statement is required to be filed with the SEC and fails to be filed with the SEC within the prescribed period and in the manner set forth in Section 2(d) (the date such filing is required to be made being an
“Additional Filing Deadline Date”) or, in the case of a post-effective amendment or a Subsequent Shelf Registration Statement, such post-effective amendment or Subsequent Registration Statement does not become effective under the
Securities Act by the Amendment Effectiveness Deadline Date or the Subsequent Shelf Registration Statement Effectiveness Deadline Date, as the case may be; 
 (iv) the Initial Shelf Registration Statement or any Subsequent Registration Statement is filed with the SEC and becomes effective under
the Securities Act but shall thereafter cease to be effective (without being succeeded immediately by a new Registration Statement that is filed and immediately becomes effective under the Securities Act) or usable for the offer and sale of
Registrable Securities in the manner contemplated by this Agreement for a period of time (including any Suspension Period) which shall exceed forty-five (45) days in the aggregate in any three (3) month period or ninety (90) days in
the aggregate in any twelve (12) month period; or 
 (v) any Registration Statement or amendment thereto, at the time it
becomes effective under the Securities Act, or any Prospectus relating thereto, at the time it is filed with the SEC or, if later, at the time the Registration Statement to which such Prospectus relates becomes effective under the Securities Act,
shall fail to name each Holder as a selling securityholder in such a manner as to permit such Holder to sell its Registrable Securities pursuant to such Registration Statement and Prospectus in accordance with applicable law, which Holder was
entitled, pursuant to the terms of this Agreement, to be so named (it being understood that, without limitation, naming such Holder in a manner that permits such Holder to sell only a portion of such Holder’s Registrable Securities referenced
in such Holder’s Notice and Questionnaire shall be deemed to be an “Event” (as defined below) for purposes of this clause (v)). 
 Each of the events of a type described in any of the foregoing clauses (i) through (v) are individually referred to herein as an “Event,” and 
 (V) the Filing Deadline Date, in the case of clause (i) above, 
 (W) the Effectiveness Deadline Date, in the case of clause (ii) above, 
 (X) the Additional Filing Deadline Date, the Amendment Effectiveness Deadline Date or the Subsequent Shelf Registration Statement
Effectiveness Deadline Date, as the case may be, in the case of clause (iii) above, 
 (Y) the date on which the duration
of the ineffectiveness or unusability of the Shelf Registration Statement exceeds the number of days permitted by clause (iv) above, in the case of clause (iv) above, and 
  

 9 

 (Z) the date the applicable Registration Statement or amendment thereto shall become
effective under the Securities Act, or the date the applicable Prospectus is filed with the SEC or, if later, the time the Registration Statement to which such Prospectus relates becomes effective under the Securities Act, as the case may be, in the
case of clause (v) above, 
 are each herein referred to as an “Event Date.” Events shall be deemed to continue until
the following dates with respect to the respective types of Events: 
 (A) the date the Initial Shelf Registration Statement
is filed with the SEC, in the case of an Event of the type described in clause (i) above; 
 (B) the date the Initial
Shelf Registration Statement becomes effective under the Securities Act, in the case of an Event of the type described in clause (ii) above; 
 (C) the date a supplement to a Prospectus, a post-effective amendment or a Subsequent Shelf Registration Statement, whichever is required, is filed with the SEC (in the case of a supplement) or becomes effective under
the Securities Act (in the case of a post-effective amendment or a Subsequent Shelf Registration Statement), in the case of an Event of the type described in clause (iii) above; 
 (D) the date the Initial Shelf Registration Statement or the Subsequent Shelf Registration Statement, as the case may be, becomes
effective and usable again, or the date another Subsequent Shelf Registration Statement is filed with the SEC pursuant to Section 2(b) and becomes effective, in the case of an Event of the type described in clause (iv) above; or

 (E) the date a supplement to the Prospectus is filed with the SEC, or the date a post-effective amendment to the
Registration Statement becomes effective under the Securities Act, or the date a Subsequent Shelf Registration Statement becomes effective under the Securities Act, which supplement, post-effective amendment or Subsequent Shelf Registration
Statement, as the case may be, names as selling securityholders, in such a manner as to permit them to sell their Registrable Securities pursuant to the Registration Statement and Prospectus supplement in accordance with applicable law, all Holders
entitled as herein provided to be so named, in the case of an Event of the type described in clause (v) above. 
 Accordingly, commencing
on (and including) any Event Date and ending on (but excluding) the next date on which there are no Events that have occurred and are continuing (an “Additional Interest Accrual Period”), the Company agrees to pay, as additional
interest (“additional interest”) and not as a penalty, an amount (the “Additional Interest Amount”) at the rate described below, payable periodically on each Additional Interest Payment Date to Record Holders, to
the extent of, for each such Additional Interest Payment Date, the unpaid Additional Interest Amount that has accrued to (but excluding) such Additional Interest Payment Date (or, if the Additional Interest Accrual Period shall have ended prior to
such Additional Interest Payment Date, the day immediately after the last day of such Additional Interest Accrual Period); provided, however, that any unpaid Additional Interest Amount that has accrued with respect to any Note, or
portion thereof, called for Redemption on a Redemption Date, or purchased by the Company pursuant to a Repurchase at Holder’s Option or Repurchase Upon Repurchase Event on an Option Purchase Date or Repurchase Date, as the case may be, that is
after the close of business on the Record Date relating to such Additional Interest Payment Date and before such Additional Interest Payment Date, shall, in each case, be instead paid, on such Redemption Date, Option Purchase Date or Repurchase
Date, as the case may be, to the Holder who submitted such Note or portion thereof for Redemption, Repurchase at Holder’s Option or Repurchase Upon Repurchase Event, as the case may be. 
  

 10 

 The Additional Interest Amount shall accrue at a rate per annum equal to one quarter of one percent
(0.25%) for the ninety (90) day period beginning on, and including, the Event Date and thereafter at a rate per annum equal to one half of one percent (0.50%) of the aggregate principal amount of the Notes of which such Record Holders were
holders of record at the close of business on the applicable Record Date; provided, however, that: 
 (I) unless
there shall be a default in the payment of any Additional Interest Amount, no Additional Interest Amounts shall accrue as to any Note from and after the earlier of (x) the date such Note is no longer a Registrable Security, (y) the date,
and to the extent, such Note is converted into shares of Common Stock in accordance with the Indenture and (z) the expiration of the Effectiveness Period; 
 (II) only those Holders (or their subsequent transferees) failing to be named as selling securityholders in the manner prescribed in
Section 2(e)(v) above shall be entitled to receive any Additional Interest Amounts that have accrued solely with respect to an Event of the type described in Section 2(e)(v) above (it being understood that this clause (II) shall not impair
any right of any Holder to receive Additional Interest Amounts that have accrued with respect to an Event other than an Event of the type described in Section 2(e)(v) above); 
 (III) only those Holders (or their subsequent transferees) whose delivery of a Notice and Questionnaire gave rise to the obligation of the
Company, pursuant to Section 2(d)(i), to file and, if applicable, make effective under the Securities Act the supplement, post-effective amendment or Subsequent Shelf Registration Statement referred to in Section 2(e)(iii) above shall be
entitled to receive any Additional Interest Amounts that have accrued solely with respect to an Event of the type described in Section 2(e)(iii) above (it being understood that this clause (III) shall not impair any right of any Holder to
receive Additional Interest Amounts that have accrued with respect to an Event other than an Event of the type described in Section 2(e)(iii) above); 
  

 11 

 (IV) if a Note ceases to be outstanding during an Additional Interest Accrual Period for
which an Additional Interest Amount would be payable with respect to such Note, then the Additional Interest Amount payable hereunder with respect to such Note shall be prorated on the basis of the number of full days such Note is outstanding during
such Additional Interest Accrual Period; and 
 (V) in no event shall the Additional Interest Amounts plus any special
interest that is payable pursuant to Section 6.02 of the Indenture (in the event of the Company’s failure to comply with its reporting obligations in the Indenture or with the requirements of Section 314(a)(1) of the Trust Indenture
Act) accrue at an aggregate rate per year exceeding 0.50% of the principal amount of the Notes. 
 Except as provided in the final paragraph
of this Section 2(e), (i) the rate of accrual of the Additional Interest Amount with respect to any period shall not exceed the rate provided for in this Section 2(e) notwithstanding the occurrence of multiple concurrent Events and
(ii) following the cure of all Events requiring the payment by the Company of Additional Interest Amounts to the Holders pursuant to this Section, the accrual of Additional Interest Amounts shall cease (without in any way limiting the effect of
any subsequent Event requiring the payment of Additional Interest Amounts by the Company). All installments of additional interest shall be paid by wire transfer of immediately available funds to the account specified by the Notice Holder or, if no
such account is specified, by mailing a check to such Notice Holder’s address shown in the register of the registrar for the Notes or for the Underlying Common Stock, as the case may be. 
 All of the Company’s obligations set forth in this Section 2(e) that are outstanding with respect to any Registrable Security at the time such
Registrable Security ceases to be a Registrable Security shall survive until such time as all such obligations with respect to such security have been satisfied in full (notwithstanding termination of this Agreement pursuant to Section 9(n)).

 The parties hereto agree that the additional interest provided for in this Section 2(e) constitutes a reasonable estimate of the
damages in respect of the Notes that may be incurred by Holders of the Notes by reason of an Event relating to such Notes, including, without limitation, the failure of a Shelf Registration Statement to be filed, become effective under the
Securities Act, amended or replaced to include the names of all Notice Holders or available for effecting resales of Registrable Securities in accordance with the provisions hereof. 
 If any Additional Interest Amounts are not paid when due, then, to the extent permitted by law, such overdue Additional Interest Amounts, if any, shall
bear interest, compounded semi-annually, until paid at the rate of interest payable with respect to overdue amounts on the Notes pursuant to Section 2.12 of the Indenture. 
 (f) The Trustee shall be entitled, on behalf of Holders, to seek any available remedy for the enforcement of this Agreement, including
for the payment of any Additional Interest Amount. 
  

 12 

 3. Registration Procedures. In connection with the registration obligations of the Company under
Section 2 hereof, the Company shall: 
 (a) Prepare and file with the SEC a Shelf Registration Statement or Shelf
Registration Statements on Form S-1 or Form S-3 or any other appropriate form under the Securities Act available for the sale of the Registrable Securities by the Holders thereof in accordance with the intended method or methods of distribution
thereof, and use its reasonable best efforts to cause each such Shelf Registration Statement to become effective under the Securities Act and remain effective under the Securities Act as provided herein; provided, that, before filing any
Shelf Registration Statement or Prospectus or any amendments or supplements thereto (other than any amendments or supplements the sole purpose of which is to name additional selling Holders) with the SEC, the Company shall furnish to the Initial
Purchasers, Designated Counsel, if any, and counsel for the Initial Purchasers copies of all such documents proposed to be filed and give reasonable consideration to any comments as the Initial Purchasers, Designated Counsel, if any, or such counsel
may propose within two (2) Business Days of the delivery of such copies to the Initial Purchasers and such counsel. 
 (b) Prepare and file with the SEC such amendments and post-effective amendments to each Shelf Registration Statement as may be necessary to keep such Shelf Registration Statement or Subsequent Shelf Registration Statement continuously
effective until the expiration of the Effectiveness Period; cause the related Prospectus to be supplemented by any required Prospectus supplement and, as so supplemented, to be filed with the SEC pursuant to Rule 424 (or any similar provisions then
in force) under the Securities Act; and comply with the provisions of the Securities Act applicable to it with respect to the disposition of all securities covered by each Shelf Registration Statement during the Effectiveness Period in accordance
with the intended methods of disposition by the sellers thereof set forth in such Shelf Registration Statement as so amended or such Prospectus as so supplemented. 
 (c) As promptly as is reasonably practicable, give notice to the Notice Holders, the Initial Purchasers, Designated Counsel, if any, and
counsel for the Initial Purchasers: 
 (i) when any Prospectus, Prospectus supplement, Shelf Registration Statement or
post-effective amendment to a Shelf Registration Statement has been filed with the SEC and, with respect to a Shelf Registration Statement or any post-effective amendment, when the same has become effective under the Securities Act, 
 (ii) of any request, following the effectiveness of a Shelf Registration Statement under the Securities Act, by the SEC or any other
governmental authority for amendments or supplements to such Shelf Registration Statement or the related Prospectus or for additional information, 
 (iii) of the issuance by the SEC or any other governmental authority of any stop order suspending the effectiveness of any Shelf Registration Statement or the initiation or threatening of any proceedings for that
purpose, 
  

 13 

 (iv) of the receipt by the Company or its legal counsel of any notification with respect
to the suspension of the qualification or exemption from qualification of any of the Registrable Securities for sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose, 
 (v) after the effective date of any Shelf Registration Statement filed with the SEC pursuant to this Agreement, of the occurrence of (but
not the nature of or details concerning) a Material Event, and 
 (vi) of the determination by the Company that a
post-effective amendment to a Shelf Registration Statement or a Subsequent Shelf Registration Statement will be filed with the SEC, which notice may, at the discretion of the Company (or as required pursuant to Section 3(i)), state that it
constitutes a Suspension Notice, in which event the provisions of Section 3(i) shall apply. 
 (d) Use its reasonable
best efforts to (i) prevent the issuance of, and, if issued, to obtain the withdrawal of, any order suspending the effectiveness of a Shelf Registration Statement and (ii) obtain the lifting of any suspension of the qualification (or
exemption from qualification) of any of the Registrable Securities for sale in any jurisdiction in which they have been qualified for sale, in either case at the earliest possible moment, and provide prompt notice to each Notice Holder and the
Initial Purchasers, Designated Counsel, if any, and counsel for the Initial Purchasers, of the withdrawal or lifting of any such order or suspension. 
 (e) If requested by the Initial Purchasers or any Notice Holder, as promptly as reasonably practicable incorporate in a Prospectus supplement or a post-effective amendment to a Shelf Registration Statement such
information as the Initial Purchasers, such Notice Holder or Designated Counsel, if any, or counsel for the Initial Purchasers shall determine to be required to be included therein by applicable law and make any required filings of such Prospectus
supplement or such post-effective amendment; provided, however, that the Company shall not be required to take any actions under this Section 3(e) that, in the opinion of counsel for the Company, are not in compliance with
applicable law. 
 (f) As promptly as reasonably practicable, furnish to each Notice Holder, the Initial Purchasers,
Designated Counsel, if any, and counsel for the Initial Purchasers, without charge, at least one (1) conformed copy of each Shelf Registration Statement and each amendment thereto, including financial statements but excluding schedules, all
documents incorporated or deemed to be incorporated therein by reference and all exhibits (unless requested in writing to the Company by such Notice Holder, such counsel or the Initial Purchasers). 
  

 14 

 (g) During the Effectiveness Period, deliver to each Notice Holder, the Initial
Purchasers, Designated Counsel, if any, and counsel for the Initial Purchasers, in connection with any sale of Registrable Securities pursuant to a Shelf Registration Statement, without charge, as many copies of the Prospectus or Prospectuses
relating to such Registrable Securities (including each preliminary prospectus) and any amendment or supplement thereto as such Notice Holder or the Initial Purchasers may reasonably request in writing; and the Company hereby consents (except during
such periods that a Suspension Notice is outstanding and has not been revoked) to the use of such Prospectus and each amendment or supplement thereto by each Notice Holder, in connection with any offering and sale of the Registrable Securities
covered by such Prospectus or any amendment or supplement thereto in the manner set forth therein. 
 (h) Prior to any public
offering of the Registrable Securities pursuant to a Shelf Registration Statement, use its reasonable best efforts to register or qualify or cooperate with the Notice Holders in connection with the registration or qualification (or exemption from
such registration or qualification) of such Registrable Securities for offer and sale under the securities or Blue Sky laws of such jurisdictions within the United States as any Notice Holder reasonably requests in writing (which request may be
included in the Notice and Questionnaire); use its reasonable best efforts to keep each such registration or qualification (or exemption therefrom) effective during the Effectiveness Period in connection with such Notice Holder’s offer and sale
of Registrable Securities pursuant to such registration or qualification (or exemption therefrom) and do any and all other acts or things reasonably necessary or advisable to enable the disposition in such jurisdictions of such Registrable
Securities in the manner set forth in the relevant Shelf Registration Statement and the related Prospectus; provided, however, that the Company will not be required to (i) qualify generally to do business in any jurisdiction where
it is not then so qualified (ii) take any action that would subject it to general service of process in suits, other than those arising out of the offering or sale of Registrable Securities or arising in connection with this Agreement, in any
jurisdiction where it is not now so subject; or (iii) take any action that would subject it to taxation in any jurisdiction where it is not then so subject. 
 (i) Upon: (A) the occurrence or existence of any pending corporate development (a “Material Event”) that, in the
reasonable discretion of the Company, makes it appropriate to suspend the availability of any Shelf Registration Statement and the related Prospectus; (B) the issuance by the SEC of a stop order suspending the effectiveness of any Shelf
Registration Statement or the initiation of proceedings with respect to any Shelf Registration Statement under Section 8(d) or 8(e) of the Securities Act; or (C) the occurrence of any event or the existence of any fact as a result of which
any Shelf Registration Statement shall contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading, or any Prospectus shall contain any
untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, 
  

 15 

 (i) in the case of clause (A) or (C) above, subject to the next sentence, as
promptly as is reasonably practicable, prepare and file, if necessary pursuant to applicable law, a post-effective amendment to such Shelf Registration Statement or a supplement to such Prospectus or any document incorporated therein by reference or
file any other required document that would be incorporated by reference into such Shelf Registration Statement and Prospectus so that such Shelf Registration Statement does not contain any untrue statement of a material fact or omit to state any
material fact required to be stated therein or necessary to make the statements therein not misleading, and so that such Prospectus does not contain any untrue statement of a material fact or omit to state any material fact necessary in order to
make the statements therein, in the light of the circumstances under which they were made, not misleading, as thereafter delivered to the purchasers of the Registrable Securities being sold thereunder, and, in the case of a post-effective amendment
to a Shelf Registration Statement, subject to the next sentence, use its reasonable best efforts to cause it to become effective under the Securities Act as promptly as is reasonably practicable, and 
 (ii) give notice to the Notice Holders, the Initial Purchasers, Designated Counsel, if any, and counsel for the Initial Purchasers that
the availability of the Shelf Registration Statement is suspended (a “Suspension Notice”) (and, upon receipt of any Suspension Notice, each Notice Holder agrees not to sell any Registrable Securities pursuant to such Shelf
Registration Statement until such Notice Holder’s receipt of copies of the supplemented or amended Prospectus provided for in clause (i) above or until such Notice Holder is advised in writing by the Company that the Prospectus may be
used). 
 The Company will use its reasonable best efforts to ensure that the use of the Prospectus may be resumed (x) in the case of
clause (A) above, as soon as, in the reasonable discretion of the Company, such suspension is no longer appropriate, (y) in the case of clause (B) above, as promptly as is reasonably practicable, and (z) in the case of clause
(C) above, as soon as, in the reasonable judgment of the Company, the Shelf Registration Statement does not contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make
the statements therein not misleading and the Prospectus does not contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which
they were made, not misleading. The period during which the availability of the Shelf Registration Statement and any Prospectus may be suspended (the “Suspension Period”) without the Company incurring any obligation to pay
additional interest pursuant to Section 2(e) shall not exceed forty-five (45) days in the aggregate in any three (3) month period or ninety (90) days in the aggregate in any twelve (12) month period. The Effectiveness Period
shall be extended by the number of days from and including the date of the giving of the Suspension Notice to and including the date on which the Notice Holder received copies of the supplemented or amended Prospectus provided in clause
(i) above, or the date on which it is advised in writing by the Company that the Prospectus may be used and has received copies of any additional or supplemental filings that are incorporated or deemed incorporated by reference in such
Prospectus. 
  

 16 

 (j) Make available for inspection during normal business hours by representatives for the
Notice Holders and any underwriters participating in any disposition pursuant to any Shelf Registration Statement and any broker-dealers, attorneys and accountants retained by such Notice Holders or any such underwriters, all relevant financial and
other records and pertinent corporate documents and properties of the Company and its subsidiaries, and cause the appropriate officers, directors and employees of the Company and its subsidiaries to make available for inspection during normal
business hours all relevant information reasonably requested by such representatives for the Notice Holders, or any such underwriters, broker-dealers, attorneys or accountants in connection with such disposition, in each case as is customary for
similar “due diligence” examinations; provided, however, that such persons shall, at the Company’s request, first agree in writing with the Company that any information that is reasonably and in good faith designated by
the Company in writing as confidential at the time of delivery of such information shall be kept confidential by such persons and shall be used solely for the purposes of exercising rights under this Agreement, unless (i) disclosure of such
information is required by court or administrative order or is necessary to respond to inquiries of governmental or regulatory authorities, (ii) disclosure of such information is required by law (including any disclosure requirements pursuant
to federal securities laws in connection with the filing of any Shelf Registration Statement or the use of any Prospectus referred to in this Agreement) or necessary to defend or prosecute a claim brought against or by any such persons (e.g.,
to establish a “due diligence” defense), (iii) such information becomes generally available to the public other than as a result of a disclosure or failure to safeguard by any such person or (iv) such information becomes
available to any such person from a source other than the Company and such source is not bound by a confidentiality agreement or is not otherwise under a duty of trust to the Company; provided further, that the foregoing inspection and
information gathering shall, to the greatest extent possible, be coordinated on behalf of all the Notice Holders and the other parties entitled thereto by Designated Counsel. 
 (k) Comply with all applicable rules and regulations of the SEC; and make generally available to its securityholders earnings statements
(which need not be audited) satisfying the provisions of Section 11(a) of the Securities Act and Rule 158 thereunder (or any similar rule promulgated under the Securities Act), which statements shall cover a period of twelve (12) months
commencing on the first day of the first fiscal quarter of the Company commencing after the effective date of each Shelf Registration Statement (within the meaning of Rule 158(c) under the Securities Act), and which statements shall be so made
generally available to the Company’s securityholders no later than thirty five (35) days after the end of the applicable twelve (12) month period (or, if such earnings statement is filed with the SEC on Form 10-K under the Exchange
Act, sixty (60) days after the end of the applicable twelve (12) month period; provided, however, that, to the extent any such earnings statement will be contained in one report, or any combination of reports, on Form 10-K
and/or Form 10-Q under the Exchange Act filed by the Company with the SEC and the deadline, under the Exchange Act, for the Company to file, with the SEC, such report, if such earnings statement is contained in a Form 10-K, or to file, with the SEC,
the last of such reports which together constitute such earnings statement, if such earnings statement is contained in a combination of reports, is a date that is later than the applicable foregoing deadline, then such later date shall apply in
place of the otherwise applicable foregoing deadline. 
  

 17 

 (l) Cooperate with each Notice Holder to facilitate the timely preparation and delivery
of certificates representing Registrable Securities sold pursuant to a Shelf Registration Statement, which certificates shall not bear any restrictive legends, and cause such Registrable Securities to be in such denominations as are permitted by the
Indenture and registered in such names as such Notice Holder may request in writing at least two (2) Business Days prior to any sale of such Registrable Securities. 
 (m) Provide a CUSIP number for all Registrable Securities covered by a Shelf Registration Statement not later than the effective date of
the Initial Shelf Registration Statement and provide the Trustee and the transfer agent for the Common Stock with certificates for the Registrable Securities that are in a form eligible for deposit with The Depository Trust Company. 
 (n) Cooperate and assist in any filings required to be made with the National Association of Securities Dealers, Inc. 
 (o) Upon the filing of the Initial Shelf Registration Statement, and upon the effectiveness under the Securities Act of the Initial Shelf
Registration Statement, announce the same, in each case by release through a reputable national newswire service. 
 (p) Take
all actions and enter into such customary agreements (including, if requested, an underwriting agreement in customary form) as are necessary, or reasonably requested by the Holders of a majority of the Registrable Securities being sold, in order to
expedite or facilitate disposition of such Registrable Securities; and in such connection, whether or not an underwriting agreement is entered into and whether or not the registration is an underwritten registration: 
 (i) the Company shall make such representations and warranties to the Holders of such Registrable Securities and the underwriters, if any,
in form, substance and scope as would be customarily made by the Company to underwriters in similar offerings of securities; 
 (ii) the Company shall obtain opinions of counsel of the Company and updates thereof (which counsel and opinions (in form, scope and substance) shall be reasonably satisfactory to the Managing Underwriters, if any, and to the counsel to the
Holders of the Registrable Securities being sold) addressed to each selling Holder and the underwriters, if any, covering the matters that would be customarily covered in opinions requested in sales of securities or underwritten offerings;

  

 18 

 (iii) the Company shall obtain “comfort letters” and updates thereof from the
Company’s independent certified public accountants (and, if necessary, any other independent certified public accountants of any subsidiary of the Company or of any business acquired by the Company for which financial statements are, or are
required to be, included in any Shelf Registration Statement) addressed to the underwriters, if any, and the selling Holders of Registrable Securities (to the extent consistent with Statement on Auditing Standards No. 72 of the American
Institute of Certified Public Accounts), such letters to be in customary form and covering matters of the type that would customarily be covered in “comfort letters” to underwriters in connection with similar underwritten offerings;

 (iv) the Company shall, if an underwriting agreement is entered into, cause any such underwriting agreement to contain
indemnification provisions and procedures substantially equivalent to the indemnification provisions and procedures set forth in Section 6 hereof with respect to the underwriters and all other parties to be indemnified pursuant to said Section;
and 
 (v) the Company shall deliver such documents and certificates as may be reasonably requested and as are customarily
delivered in similar offerings to the holders of a majority of the Registrable Securities being sold and to the Managing Underwriters, if any; 
 the above to be done at (x) the effectiveness of any Shelf Registration Statement (and each post-effective amendment thereto) and (y) each closing under any underwriting or similar agreement as and to the extent required
thereunder. 
 (q) Cause the Indenture to be qualified under the TIA not later than the effective date of the Initial Shelf
Registration Statement; and, in connection therewith, cooperate with the Trustee to effect such changes to the Indenture as may be required for the Indenture to be so qualified in accordance with the terms of the TIA and execute, and use its
reasonable best efforts to cause the Trustee to execute, all documents as may be required to effect such changes, and all other forms and documents required to be filed with the SEC to enable the Indenture to be so qualified in a timely manner.

 (r) Use its reasonable best efforts to cause the Underlying Common Stock to be listed on The Nasdaq Global Market.

 (s) In the event that any broker-dealer registered under the Exchange Act shall underwrite any Registrable Securities or
participate as a member of an underwriting syndicate or selling group or “participate in a public offering” (within the meaning of the Conduct Rules (the “NASD Rules”) of the National Association of Securities Dealers,
Inc.) thereof, whether as a Holder of such Registrable Securities or as an underwriter, a placement or sales agent or a broker or dealer in respect thereof, or otherwise, the Company will assist such broker-dealer in complying with the requirements
of such NASD Rules, including, without limitation, by: (i) if such NASD Rules, including NASD Rule 2720, shall so require, engaging a “qualified independent underwriter” (as defined in NASD Rule 2720) to participate in the preparation
of the Shelf Registration Statement relating to such Registrable Securities, to exercise usual standards of due diligence in respect thereof and, if any portion of the offering contemplated by such Shelf Registration Statement is an underwritten
offering or is made through a placement or sales agent, to recommend the yield or price, as the case may be, of such Registrable Securities; (ii) indemnifying any such qualified independent underwriter to the extent of the indemnification of
underwriters provided in Section 6 hereof; and (iii) providing such information to such broker-dealer as may be required in order for such broker-dealer to comply with the requirements of the NASD Rules. 
  

 19 

 4. Holder’s Obligations. Each Holder agrees, by acquisition of the Registrable Securities,
that no Holder of Registrable Securities shall be entitled to sell any of such Registrable Securities pursuant to a Shelf Registration Statement or to receive a Prospectus relating thereto, unless such Holder has furnished the Company with a Notice
and Questionnaire as required pursuant to Section 2(d) hereof (including the information required to be included in such Notice and Questionnaire) and the information set forth in the next sentence. Each Notice Holder agrees promptly to furnish
to the Company all information required to be disclosed in order to make the information previously furnished to the Company by such Notice Holder not misleading and any other information regarding such Notice Holder and the distribution of such
Registrable Securities as the Company may from time to time reasonably request. Any sale of any Registrable Securities by any Holder shall constitute a representation and warranty by such Holder that the information relating to such Holder and its
plan of distribution is as set forth in the Prospectus delivered by such Holder in connection with such disposition, that such Prospectus does not as of the time of such sale contain any untrue statement of a material fact relating to or provided by
such Holder or its plan of distribution and that such Prospectus does not as of the time of such sale omit to state any material fact relating to or provided by such Holder or its plan of distribution necessary in order to make the statements in
such Prospectus, in the light of the circumstances under which they were made, not misleading. 
 5. Registration Expenses. The
Company shall bear all fees and expenses incurred in connection with the performance by the Company of its obligations under Section 2 and Section 3 of this Agreement whether or not any of the Shelf Registration Statements are filed or
declared effective under the Securities Act. Such fees and expenses (“Registration Expenses”) shall include, without limitation, (i) all registration and filing fees and expenses (including, without limitation, fees and
expenses (x) with respect to filings required to be made with the National Association of Securities Dealers, Inc. and (y) of compliance with federal securities laws and state securities or Blue Sky laws (including, without limitation,
reasonable fees and disbursements of Designated Counsel, if any, in connection with Blue Sky qualifications of the Registrable Securities under the laws of such jurisdictions as the Notice Holders of a majority of the Registrable Securities being
sold pursuant to a Shelf Registration Statement may designate), (ii) all printing expenses (including, without limitation, expenses of printing certificates for Registrable Securities in a form eligible for deposit with The Depository Trust
Company and printing Prospectuses), (iii) all duplication and mailing expenses relating to copies of any Shelf Registration Statement or Prospectus delivered to any Holders hereunder, (iv) all fees and disbursements of counsel for the
Company, (v) all fees and disbursements of Designated Counsel, which fees and disbursements shall not exceed an aggregate of twenty thousand dollars ($20,000) during the term of this Agreement, (vi) all fees and disbursements of the
Trustee and its counsel and of the registrar and transfer agent for the Common Stock, (vii) the reasonable fees and disbursements, in connection with the review of the Shelf Registration Statement(s), of Dewey Ballantine LLP, counsel for the
Initial Purchasers, which fees and disbursements shall not exceed an aggregate of twenty thousand dollars ($20,000) during the term of this Agreement and (viii) Securities Act liability insurance obtained by the Company in its sole discretion.
In addition, the Company shall pay the internal expenses of the Company (including, without limitation, all salaries and expenses of officers and employees performing legal or accounting duties), the expense of any annual audit or quarterly review,
the fees and expenses incurred in connection with the listing by the Company of the Registrable Securities on any securities exchange or quotation system on which similar securities of the Company are then listed and the fees and expenses of any
person, including, without limitation, special experts, retained by the Company. 
  

 20 

 6. Indemnification, Contribution. 
 (a) The Company agrees to indemnify, defend and hold harmless each Initial Purchaser, each Holder, each person (a “Controlling
Person”), if any, who controls any Initial Purchaser or Holder within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act and the respective officers, directors, partners, employees, representatives
and agents of any Initial Purchaser, the Holders or any Controlling Person (each, an “Indemnified Party”), from and against any loss, damage, expense, liability, claim or any actions in respect thereof (including the reasonable cost
of investigation) which such Indemnified Party may incur or become subject to under the Securities Act, the Exchange Act or otherwise, insofar as such loss, damage, expense, liability, claim or action arises out of or is based upon any untrue
statement or alleged untrue statement of a material fact contained in any Shelf Registration Statement or Prospectus, including any document incorporated by reference therein, or in any amendment or supplement thereto or in any preliminary
prospectus, or arises out of or is based upon any omission or alleged omission to state a material fact required to be stated in any Shelf Registration Statement or in any amendment or supplement thereto or necessary to make the statements therein
not misleading, or arises out of or is based upon any omission or alleged omission to state a material fact necessary in order to make the statements made in any Prospectus or in any amendment or supplement thereto or in any preliminary prospectus,
in the light of the circumstances under which such statements were made, not misleading, and the Company shall reimburse, as incurred, the Indemnified Parties for any legal or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, damage, expense, liability, claim or action in respect thereof; provided, however, that the Company shall not be required to provide any indemnification pursuant to this Section 6(a) in
any such case insofar as any such loss, damage, expense, liability, claim or action arises out of or is based upon any untrue statement or omission or alleged untrue statement or omission of a material fact contained in, or omitted from, and in
conformity with information furnished in writing by or on behalf of an Initial Purchaser or a Holder to the Company expressly for use in, any Shelf Registration Statement or any Prospectus; provided further, however, that this
indemnity agreement will be in addition to any liability which the Company may otherwise have to such Indemnified Party. 
  

 21 

 (b) Each Holder, severally and not jointly, agrees to indemnify, defend and hold harmless
the Company, its directors, officers, employees and any person who controls the Company within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act (each, a “Company Indemnified Party”) from
and against any loss, damage, expense, liability, claim or any actions in respect thereof (including the reasonable cost of investigation) which such Company Indemnified Party may incur or become subject to under the Securities Act, the Exchange Act
or otherwise, insofar as such loss, damage, expense, liability, claim or action arises out of or is based upon any untrue statement or alleged untrue statement of a material fact contained in, and in conformity with information (the “Holder
Information”) furnished in writing by or on behalf of such Holder to the Company expressly for use in, any Shelf Registration Statement or Prospectus, or arises out of or is based upon any omission or alleged omission to state a material
fact in connection with such Holder Information required to be stated in any Shelf Registration Statement or Prospectus or necessary to make such Holder Information not misleading; and, subject to the limitation set forth in the immediately
preceding clause, each Holder shall reimburse, as incurred, the Company for any legal or other expenses reasonably incurred by the Company or any such controlling person in connection with investigating or defending any loss, damage, expense,
liability, claim or action in respect thereof. This indemnity agreement will be in addition to any liability which such Holder may otherwise have to the Company or any of its controlling persons. In no event shall the liability of any selling Holder
of Registrable Securities hereunder be greater in amount than the dollar amount of the proceeds received by such Holder upon the sale, pursuant to the Shelf Registration Statement, of the Registrable Securities giving rise to such indemnification
obligation. 
 (c) If any action, suit or proceeding (each, a “Proceeding”) is brought against any person in
respect of which indemnity may be sought pursuant to either Section 6(a) or Section 6(b), such person (the “Indemnified Party”) shall promptly notify the person against whom such indemnity may be sought (the
“Indemnifying Party”) in writing of the institution of such Proceeding and the Indemnifying Party shall assume the defense of such Proceeding; provided, however, that the omission to so notify such Indemnifying Party
shall not relieve such Indemnifying Party from any liability which it may have to such Indemnified Party or otherwise. Such Indemnified Party shall have the right to employ its own counsel in any such case, but the fees and expenses of such counsel
shall be at the expense of such Indemnified Party unless the employment of such counsel shall have been authorized in writing by such Indemnifying Party in connection with the defense of such Proceeding or such Indemnifying Party shall not have
employed counsel to have charge of the defense of such Proceeding within thirty (30) days of the receipt of notice thereof or such Indemnified Party shall have reasonably concluded upon the written advice of counsel that there may be one or
more defenses available to it that are different from, additional to or in conflict with those available to such Indemnifying Party (in which case such Indemnifying Party shall not have the right to direct that portion of the defense of such
Proceeding on behalf of the Indemnified Party, but such Indemnifying Party may employ counsel and participate in the defense thereof but the fees and expenses of such counsel shall be at the expense of such Indemnifying Party), in any of which
events such reasonable fees and expenses shall be borne by such Indemnifying Party and paid as incurred (it being understood, however, that such Indemnifying Party shall not be liable for the expenses of more than one separate counsel in any one
Proceeding or series of related Proceedings together with reasonably necessary local counsel representing the Indemnified Parties who are parties to such action). An Indemnifying Party shall not be liable for any settlement of such Proceeding
effected without the written consent of such Indemnifying Party, but if settled with the written consent of such Indemnifying Party, such Indemnifying Party agrees to indemnify and hold harmless an Indemnified Party from and against any loss or
liability by reason of such settlement. Notwithstanding the foregoing sentence, if at any time an Indemnified Party shall have requested an Indemnifying Party to reimburse such Indemnified Party for fees and expenses of counsel as contemplated by
the second sentence of this paragraph, then such Indemnifying Party agrees that it shall be liable for any settlement of any Proceeding effected without its written consent if (i) such settlement is entered into more than sixty
(60) Business Days after receipt by such Indemnifying Party of the aforesaid request, (ii) such Indemnifying Party shall not have fully reimbursed such Indemnified Party in accordance with such request prior to the date of such settlement
and (iii) such Indemnified Party shall have given such Indemnifying Party at least thirty (30) days’ prior notice of its intention to settle. No Indemnifying Party shall, without the prior written consent of any Indemnified Party,
effect any settlement of any pending or threatened Proceeding in respect of which such Indemnified Party is or could have been a party and indemnity could have been sought hereunder by such Indemnified Party, unless such settlement includes an
unconditional release of such Indemnified Party from all liability on claims that are the subject matter of such Proceeding and does not include an admission of fault or culpability or a failure to act by or on behalf of such Indemnified Party.

  

 22 

 (d) If the indemnification provided for in this Section 6 is unavailable to an
Indemnified Party under Section 6(a) or Section 6(b), or insufficient to hold such Indemnified Party harmless, in respect of any losses, damages, expenses, liabilities, claims or actions referred to therein, then each applicable
Indemnifying Party, in lieu of indemnifying such Indemnified Party, shall contribute to the amount paid or payable by such Indemnified Party as a result of such losses, damages, expenses, liabilities, claims or actions (i) in such proportion as
is appropriate to reflect the relative benefits received by the Company, on the one hand, and by the Holders or the Initial Purchasers, on the other hand, from the offering of the Registrable Securities or (ii) if the allocation provided by
clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company, on the one hand, and of the
Holders or the Initial Purchasers, on the other hand, in connection with the statements or omissions which resulted in such losses, damages, expenses, liabilities, claims or actions, as well as any other relevant equitable considerations. The
relative fault of the Company, on the one hand, and of the Holders or the Initial Purchasers, on the other hand, shall be determined by reference to, among other things, whether the untrue statement or alleged untrue statement of a material fact or
omission or alleged omission relates to information supplied by the Company or by the Holders or the Initial Purchasers and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or
omission. The amount paid or payable by a party as a result of the losses, damages, expenses, liabilities, claims and actions referred to above shall be deemed to include any reasonable legal or other fees or expenses reasonably incurred by such
party in connection with investigating or defending any Proceeding. 
  

 23 

 (e) The Company, the Holders and the Initial Purchasers agree that it would not be just
and equitable if contribution pursuant to this Section 6 were determined by pro rata allocation or by any other method of allocation which does not take account of the equitable considerations referred to in Section 6(d) above.
Notwithstanding the provisions of this Section 6, no Holder shall be required to contribute any amount in excess of the amount by which the total price at which the Registrable Securities giving rise to such contribution obligation and sold by
such Holder were offered to the public exceeds the amount of any damages which it has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Holders’ respective obligations to contribute
pursuant to this Section 6 are several in proportion to the respective amount of Registrable Securities they have sold pursuant to a Shelf Registration Statement, and not joint. The remedies provided for in this Section 6 are not exclusive
and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity. 
 (f) The indemnity and contribution provisions contained in this Section 6 shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of
any Holder or the Initial Purchasers or any person controlling any Holder or Initial Purchaser, or the Company, or the Company’s officers or directors or any person controlling the Company and (iii) the sale of any Registrable Security by
any Holder. 
 7. Information Requirements. 
 (a) The Company covenants that, if at any time before the end of the Effectiveness Period it is not subject to the reporting requirements
of the Exchange Act, it will cooperate with any Holder of Registrable Securities and take such further action as any Holder of Registrable Securities may reasonably request in writing (including, without limitation, making such representations as
any such Holder may reasonably request), all to the extent required from time to time to enable such Holder to sell Registrable Securities without registration under the Securities Act within the limitations of the exemptions provided by Rule 144,
Rule 144A, Regulation S and Regulation D under the Securities Act and customarily taken in connection with sales pursuant to such exemptions. Upon the written request of any Holder, the Company shall deliver to such Holder a written statement as to
whether the Company has complied with the reporting requirements of the Exchange Act, unless such a statement has been included in the Company’s most recent report filed with the SEC pursuant to Section 13 or Section 15(d) of Exchange
Act. 
  

 24 

 (b) The Company shall file the reports required to be filed by it under the Exchange Act
and shall comply with all other requirements set forth in the instructions to Form S-3 in order to allow the Company to be eligible to file registration statements on Form S-3. 
 8. Underwritten Registrations. 
 (a) If any of the Registrable Securities covered by the Shelf Registration Statement are to be offered and sold in an underwritten offering, the investment banker or investment bankers and manager or managers that
will administer the offering (“Managing Underwriters”) shall be selected by the holders of a majority of such Registrable Securities to be included in such offering. 
 (b) No person may participate in any underwritten registration hereunder unless such person (i) agrees to sell such person’s
Registrable Securities on the basis reasonably provided in any underwriting arrangements approved by the persons entitled hereunder to approve such arrangements and (ii) completes and executes all questionnaires, powers of attorney,
indemnities, underwriting agreements and other documents reasonably required under the terms of such underwriting arrangements. 
 (c) Notwithstanding anything herein to the contrary, in no event shall Registrable Securities be offered and sold pursuant hereto through a Shelf Registration Statement pursuant to an underwritten offering without the prior written
agreement of the Company. 
 9. Miscellaneous. 
 (a) Remedies. The Company acknowledges and agrees that any failure by the Company to comply with its obligations under this
Agreement may result in material irreparable injury to the Initial Purchasers and the Holders for which there is no adequate remedy at law, that it will not be possible to measure damages for such injuries precisely and that, in the event of any
such failure, any Initial Purchaser or Holder may obtain such relief as may be required to specifically enforce the Company’s obligations under this Agreement. The Company further agrees to waive the defense in any action for specific
performance that a remedy at law would be adequate. Notwithstanding the foregoing two sentences, this Section 9(a) shall not apply to the subject matter referred to in and contemplated by Section 2(e). 
 (b) No Conflicting Agreements. The Company is not, as of the date hereof, a party to, nor shall it, on or after the date of this
Agreement, enter into, any agreement with respect to the Company’s securities that conflicts with the rights granted to the Holders in this Agreement. The Company represents and warrants that the rights granted to the Holders hereunder do not
in any way conflict with the rights granted to the holders of the Company’s securities under any other agreements. The Company will not take any action with respect to the Registrable Securities which would adversely affect the ability of any
of the Holders to include such Registrable Securities in a registration undertaken pursuant to this Agreement. The Company represents and covenants that it has not granted, and shall not grant, to any of its security holders (other than the Holders
in such capacity) the right to include any of the Company’s securities in any Shelf Registration Statement filed pursuant to this Agreement. 
  

 25 

 (c) Amendments and Waivers. The provisions of this Agreement, including the
provisions of this sentence, may not be amended, modified or supplemented, and waivers or consents to departures from the provisions hereof may not be given, unless the Company has obtained the written consent of Holders of a majority of outstanding
Registrable Securities; provided, however, that, no consent is necessary from any of the Holders in the event that this Agreement is amended, modified or supplemented for the purpose of curing any ambiguity, defect or inconsistency
that does not adversely affect the rights of any Holders. Notwithstanding the foregoing, a waiver or consent to depart from the provisions hereof with respect to a matter that relates exclusively to the rights of Holders of Registrable Securities
whose securities are being sold pursuant to a Shelf Registration Statement and that does not directly or indirectly affect the rights of other Holders of Registrable Securities may be given by Holders of at least a majority of the Registrable
Securities being sold by such Holders pursuant to such Shelf Registration Statement; provided, however, that the provisions of this sentence may not be amended, modified, or supplemented except in accordance with the provisions of the
immediately preceding sentence. Each Holder of Registrable Securities outstanding at the time of any such amendment, modification, supplement, waiver or consent or thereafter shall be bound by any such amendment, modification, supplement, waiver or
consent effected pursuant to this Section 9(c), whether or not any notice, writing or marking indicating such amendment, modification, supplement, waiver or consent appears on the Registrable Securities or is delivered to such Holder.

 (d) Notices. All notices and other communications provided for or permitted hereunder shall be made in writing by
hand delivery, by telecopier, by courier guaranteeing overnight delivery or by first-class mail, return receipt requested, and shall be deemed given (A) when made, if made by hand delivery, (B) upon confirmation, if made by telecopier,
(C) one (1) Business Day after being deposited with such courier, if made by overnight courier or (D) on the date indicated on the notice of receipt, if made by first-class mail, to the parties as follows: 
 (i) if to a Holder, at the most current address given by such Holder to the Company in a Notice and Questionnaire or any amendment
thereto; 
  

 26 

	 	(ii)	if to the Company, to: 

 Diversa
Corporation 
 4955 Directors Place 
 San Diego, CA 92121 
 Attention: Chief Financial Officer 
 Telecopy No.: (858) 526-5553 
 with a copy to (for informational purposes only): 
 Cooley Godward Kronish LLP 
 4401 Eastgate Mall 
 San Diego, California 92130 
 Attention: Sarah M. Mostafa 
 Telecopy No.: (858) 550-6420 
  

	 	(iii)	if to the Initial Purchasers, to: 

 c/o
UBS Securities LLC 
 299 Park Avenue 
 New York, New York 10171 
 Attention: Syndicate Department 
 Telecopy No.: (212) 713-1205 
 with a copy to (for informational purposes only): 
 UBS Securities LLC 
 299 Park Avenue 
 New York, New York 10171 
 Attention: Legal Department 
 Telecopy No.: (212) 821-4042 
 and 
 UBS Securities LLC 
 677 Washington Boulevard 
 Stamford, Connecticut 06901 
 Attention: Syndicate Department 
 Telecopy No.: (203) 719-0683 
 or to such other address as such person may have furnished to the other
persons identified in this Section 9(d) in writing in accordance herewith. In addition, the Company may provide notice to any Holder by sending an electronic mail to the email address specified on such Holder’s Notice and Questionnaire.

 (e) Majority of Registrable Securities. For purposes of determining what constitutes holders of a majority of
Registrable Securities, as referred to in this Agreement, a majority shall constitute a majority in aggregate principal amount of Registrable Securities, treating each relevant holder of shares of Underlying Common Stock of the Notes as a holder of
the aggregate principal amount of Notes in respect of which such Common Stock was issued. 
  

 27 

 (f) Approval of Holders. Whenever the consent or approval of Holders of a
specified percentage of Registrable Securities is required hereunder, Registrable Securities held by the Company or its “affiliates” (as such term is defined in Rule 405 under the Securities Act) (other than the Initial Purchasers or
subsequent Holders of Registrable Securities, if the Initial Purchasers or such subsequent Holders are deemed to be such affiliates solely by reason of their holdings of such Registrable Securities) shall not be counted in determining whether such
consent or approval was given by the Holders of such required percentage. 
 (g) Third Party Beneficiaries. The Holders
shall be third party beneficiaries to the agreements made hereunder between the Company, on the one hand, and the Initial Purchasers, on the other hand, and shall have the right to enforce such agreements directly to the extent they may deem such
enforcement necessary or advisable to protect their rights or the rights of Holders hereunder. The Trustee shall be entitled to the rights granted to it pursuant to this Agreement. 
 (h) Successors and Assigns. Any person who purchases any Covered Security from any Initial Purchaser or from any Holder shall be
deemed, for purposes of this Agreement, to be an assignee of such Initial Purchaser or such Holder, as the case may be. This Agreement shall inure to the benefit of and be binding upon the respective successors and assigns of each of the parties
hereto and shall inure to the benefit of and be binding upon each Holder of any Covered Security. 
 (i) Counterparts.
This Agreement may be executed in any number of counterparts and by the parties hereto in separate counterparts, each of which when so executed shall be deemed to be original and all of which taken together shall constitute one and the same
agreement. 
 (j) Headings. The headings in this Agreement are for convenience of reference only and shall not
limit or otherwise affect the meaning hereof. 
 (k) Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED
IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO CONFLICTS OF LAWS PRINCIPLES THEREOF. 
 (l)
Severability. If any term, provision, covenant or restriction of this Agreement is held to be invalid, illegal, void or unenforceable, the remainder of the terms, provisions, covenants and restrictions set forth herein shall remain in full
force and effect and shall in no way be affected, impaired or invalidated thereby, and the parties hereto shall use their best efforts to find and employ an alternative means to achieve the same or substantially the same result as that contemplated
by such term, provision, covenant or restriction, it being intended that all of the rights and privileges of the parties shall be enforceable to the fullest extent permitted by law. 
  

 28 

 (m) Entire Agreement. This Agreement is intended by the parties hereto as a final
expression of their agreement and is intended to be a complete and exclusive statement of the agreement and understanding of the parties hereto in respect of the subject matter contained herein and the registration rights granted by the Company with
respect to the Registrable Securities. Except as provided in the Purchase Agreement, there are no restrictions, promises, warranties or undertakings, other than those set forth or referred to herein, with respect to the registration rights granted
by the Company with respect to the Registrable Securities. This Agreement supersedes all prior agreements and undertakings among the parties with respect to such registration rights. No party hereto shall have any rights, duties or obligations other
than those specifically set forth in this Agreement. 
 (n) Termination. This Agreement and the obligations of the
parties hereunder shall terminate upon the end of the Effectiveness Period, except for any liabilities or obligations under Section 4, Section 5 or Section 6 hereof and the obligations to make payments of and provide for additional
interest under Section 2(e) hereof to the extent such additional interest accrues prior to the end of the Effectiveness Period and to the extent any overdue additional interest accrues in accordance with the last paragraph of such
Section 2(e), each of which shall remain in effect in accordance with its terms. 
 (o) Submission to
Jurisdiction. Except as set forth below, no claim, counterclaim or dispute of any kind or nature whatsoever arising out of or in any way relating to this Agreement (“Claim”) may be commenced, prosecuted or continued in
any court other than the courts of the State of New York located in the City and County of New York or in the United States District Court for the Southern District of New York, which courts shall have jurisdiction over the adjudication of such
matters, and the Company hereby consents to the jurisdiction of such courts and personal service with respect thereto. The Company hereby consents to personal jurisdiction, service and venue in any court in which any Claim arising out of or in any
way relating to this Agreement is brought by any third party against any Initial Purchaser. THE COMPANY HEREBY WAIVES ALL RIGHTS TO TRIAL BY JURY IN ANY PROCEEDING (WHETHER BASED UPON CONTRACT, TORT OR OTHERWISE) IN ANY WAY ARISING OUT OF OR
RELATING TO THIS AGREEMENT. The Company agrees that a final judgment in any such Proceeding brought in any such court shall be conclusive and binding upon the Company and may be enforced in any other courts in the jurisdiction of which the Company
is or may be subject, by suit upon such judgment. 
 [The Remainder of This Page Intentionally Left Blank; Signature Page
Follows] 
  

 29 

 In Witness Whereof, the parties have executed this Agreement as of the date first written above.

  

			
	 Very truly yours,
  
 DIVERSA CORPORATION

		
	By:	 	/s/    ANTHONY E. ALTIG        
		 	 Name: Anthony E. Altig
 Title: Chief Financial
Officer

  

			
	Accepted and agreed to as of the date first above written, on behalf of itself and the other several Initial Purchasers:
	
	UBS SECURITIES LLC
		
	By:	 	/s/    JAMEY ESCALER         
		 	 Name: Jamey Escaler
 Title:
Director

			
		
	By:	 	/s/    ERIK A. BERNOTAS        
		 	 Name: Erik A. Bernotas
 Title: Associate
Director

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00120-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00120-of-00352.parquet"}]]