EX-4.1




 Exhibit 4.1 

Final Form 
 THIS
SECURITY AND THE COMMON STOCK, IF ANY, ISSUABLE UPON CONVERSION OF THIS SECURITY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED
EXCEPT IN ACCORDANCE WITH THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF OR OF A BENEFICIAL INTEREST HEREIN, THE ACQUIRER AGREES FOR THE BENEFIT OF ASPEN AEROGELS, INC. (THE “COMPANY”) THAT IT WILL NOT OFFER, SELL, PLEDGE OR OTHERWISE
TRANSFER THIS SECURITY OR ANY BENEFICIAL INTEREST HEREIN EXCEPT: 
  

	 	A.	 TO THE COMPANY OR ANY SUBSIDIARY THEREOF, OR 



 

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



  

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


 PRIOR TO THE REGISTRATION OF ANY TRANSFER IN
ACCORDANCE WITH CLAUSE (C) 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. 

THIS SECURITY IS SUBJECT TO RESTRICTIONS ON TRANSFER AS SET FORTH IN A NOTE PURCHASE AGREEMENT DATED AS OF FEBRUARY 15, 2022 (AS IT MAY
BE AMENDED FROM TIME TO TIME), BY AND AMONG THE COMPANY AND CERTAIN OTHER PARTIES THERETO, COPIES OF WHICH ARE PUBLICLY FILED OR ON FILE WITH THE SECRETARY OF THE COMPANY, AND THIS SECURITY MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED
EXCEPT IN COMPLIANCE THEREWITH. 
 THIS NOTE HAS BEEN ISSUED WITH “ORIGINAL ISSUE DISCOUNT” (WITHIN THE MEANING OF SECTION 1272 OF
THE INTERNAL REVENUE CODE OF 1986, AS AMENDED). UPON WRITTEN REQUEST, THE ISSUER OF THIS NOTE WILL PROMPTLY MAKE AVAILABLE TO ANY HOLDER OF THIS NOTE THE INFORMATION REQUIRED TO BE FURNISHED BY TREASURY REGULATIONS SECTION 1.1275-3. IN ORDER TO REQUEST SUCH INFORMATION, A HOLDER OF THIS NOTE SHOULD CONTACT THE CHIEF FINANCIAL OFFICER AT 30 FORBES ROAD, BUILDING B, NORTHBOROUGH, MA 01532, PHONE NUMBER
(508) 691-1111. 
  











 Aspen Aerogels, Inc. 

Convertible Senior PIK Toggle Note due 2027 
 No.
C-1 Initially $100,000,000 
 Aspen Aerogels, Inc., a corporation duly organized and validly existing
under the laws of the State of Delaware (the “Company,” which term includes any successor corporation or other entity under the Indenture referred to on the reverse hereof), for value received hereby promises to pay to Wood River
Capital, LLC, or registered assigns, the principal sum of the Capitalized Principal Amount corresponding to the Initial Principal Amount of $100,000,000, on February 18, 2027, and interest thereon as set forth below. 

This Note shall bear interest at the applicable Cash Interest Rate or PIK Interest Rate from February 18, 2022, or from the most recent
date to which interest had been paid or provided for to, but excluding, the next scheduled Interest Payment Date until February 18, 2027. Interest is payable semi-annually in arrears in cash at the Cash Interest Rate or by PIK Payments at the
PIK Interest Rate, pursuant to Section 2.03(d) of the Indenture, on each June 30 and December 30, commencing on June 30, 2022, to Holders of record at the close of business on the preceding June 15 and December 15
(whether or not such day is a Business Day), respectively. 
 The Company shall make payments on the Notes in the manner set forth in the
Indenture. The Company has initially designated itself as the Paying Agent, Conversion Agent and Note Registrar in respect of the Notes and its office in Northborough, MA as a place where Notes may be presented for payment or for registration of
transfer and exchange. 
 Reference is made to the further provisions of this Note set forth on the reverse hereof, including, without
limitation, provisions giving the Holder of this Note the right to convert this Note into cash, shares of Common Stock or a combination of cash and shares of Common Stock, as applicable, on the terms and subject to the limitations set forth in the
Indenture. Such further provisions shall for all purposes have the same effect as though fully set forth at this place. 
 This Note, and
any claim, controversy or dispute arising under or related to this Note, shall be construed in accordance with and governed by the laws of the State of New York (without regard to the conflicts of laws provisions thereof). 

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

[Remainder of page intentionally left blank] 

  
 2 












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

 

			
	ASPEN AEROGELS, INC.
		
	By:	 	  

		 	Name:
		 	Title:

 Dated: 
  

			
	WOOD RIVER CAPITAL, LLC, as Holder
		
	By:	 	  

		 	Authorized Officer


  
 3 












 [FORM OF REVERSE OF NOTE] 

Aspen Aerogels, Inc. 
 Convertible
Senior PIK Toggle Note due 2027 
 This Note is one of a duly authorized issue of Notes of the Company, designated as its Convertible Senior
PIK Toggle Notes due 2027 (the “Notes”), initially in the aggregate principal amount of $100,000,000 (as increased by any PIK Payments). Additional Notes may be issued in an unlimited aggregate principal amount, subject to certain
conditions specified in the Indenture. Capitalized terms used in this Note and not defined in this Note shall have the respective meanings set forth in the Indenture (as amended in accordance herewith, the “Indenture”) attached
hereto as Exhibit A. The originally issued Notes, all PIK Notes, and any additional Notes issued as set forth in the Indenture or this Note shall constitute a single class. 

Incorporation by Reference of Provisions of the Indenture. 

At all times during which the Indenture has not been executed and delivered, to the extent not inconsistent with any other terms of the Notes
set forth herein, all of the terms and conditions of the Indenture shall be and are hereby incorporated by reference in the Notes as if fully set forth herein, and shall be binding upon the Company and, by accepting a Note, each Holder and inure to
the benefit of the Holders of the Notes, except that (a) to the extent that the Indenture requires (i) any notices, certificates or other items to be delivered by the Company to the Trustee, Paying Agent or Conversion Agent, such notices,
certificates or other items shall be delivered instead to each Holder, (ii) any Opinions of Counsel to be delivered by the Company to the Trustee, Paying Agent or Conversion Agent, such opinions shall instead be delivered to the Holders,
(iii) any notices, certificates or other items to be delivered by the Holders to the Trustee, Paying Agent or Conversion Agent, such notices, certificates or other items shall be delivered instead by the Holders to the Company, (iv) any
notices, certificates or other items to be delivered by the Trustee to the Holders, such notices, certificates or other items shall be delivered instead by the Company to the Holders (with any references to one or more Responsible Officers being
deemed to refer to any Officer of the Company), (v) any payments or deliveries to be made by the Company to the Trustee, Paying Agent or Conversion Agent for payment or delivery, as the case may be, to Holders, such payments or deliveries shall
instead be made directly by the Company to the applicable Holder in the same manner as set forth in Article 2 and Article 14 of the Indenture, (vi) any Note to be authenticated by the Trustee or an Authenticating Agent or to bear a certificate
of authentication or require any Opinion of Counsel, Officer’s Certificate or Company Order for such authentication, the Notes shall instead by authenticated by the Company (the execution and delivery of any Note by manual, electronic or
facsimile signature of the Company to be deemed to constitute such authentication for all purposes) without any requirement for any such Opinion of Counsel, Officer’s Certificate or Company Order, (vii) Notes to be canceled by the Trustee,
such Notes shall instead be cancelled by the Company, (viii) any Notes to be surrendered to the Trustee or any Paying Agent, Conversion Agent or Note Registrar, such Notes shall be surrendered instead to the Company, (ix) Notes to be
redeemed upon a partial redemption to be selected by the Trustee, such Notes shall be selected instead by the Company, (x) any amounts to be held in trust with the Trustee, Paying Agent or Conversion Agent, such amounts shall instead be set
aside, segregated and held in trust by the Company for the benefit of the Holders of the Notes, (xi) the Trustee to execute 

  
 R-1 












 
any amendment or supplement pursuant to Article 10 of the Indenture, any such amendment or supplement shall be executed solely by the Company (for the avoidance of doubt, in the case of
Section 10.02 of the Indenture, upon receipt of the requisite consent from Holders), or (xii) a supplemental indenture to evidence the succession of a Successor Corporation, such succession shall instead be evidenced by an amendment to
this Note which shall be permitted without Holder consent pursuant to Section 10.01(b) of the Indenture; (b) any appointment or designation of the Trustee as Note Registrar, Paying Agent or Conversion Agent or agent for service of demands
and notices in connection with the Notes, or of the Corporate Trust Office or any other office of the Trustee for the taking of any relevant action, shall hereby be deemed to instead refer to the Company instead and its office at 30 Forbes Road,
Building B, Northborough, MA 01532 (and/or such other or additional address as notified by the Company in writing to the Holders from time to time); (c) each of Section 4.03, Section 4.04(a), Article 7, Section 10.05,
Section 14.08 and Section 17.16 of the Indenture shall not apply; and (d) any and all rights granted to the Trustee under Article 6 and Article 9 of the Indenture shall be granted to and may be exercised by the Holders of a majority
in principal amount of the outstanding Notes. 
 Indenture. 

At any time, in the Company’s sole discretion, the Company may appoint a trustee (the “Trustee”) who satisfies the
eligibility requirements of Article 7 of the Indenture and, in any such event, the Company shall take whatever actions are necessary to cause an Indenture substantially in the form of Exhibit A attached hereto to be executed and delivered by the
Company and the Trustee. In such event, (i) this Note shall be cancelled and reissued, executed and authenticated in a like principal amount as set forth in the Indenture in the form of the applicable Form of Note as set forth in Exhibit A of
the Indenture as executed and (ii) the Notes shall be subject to all of the terms stated in the Indenture. In such event, the Company may require Holders of the Notes, and each Holder by his or her acceptance hereof agrees upon the
Company’s request, to surrender to the Trustee all Notes in the form hereof in exchange for replacement Notes substantially in the form of the applicable Form of Note as set forth in Exhibit A of the Indenture as executed. 

Events of Default. 
 In
case certain Events of Default shall have occurred and be continuing, the principal of, and interest on, all Notes may be declared, by Holders of at least 51% in aggregate principal amount of Notes then outstanding, and upon said declaration shall
become, due and payable, in the manner, with the effect and subject to the conditions and certain exceptions set forth in the Indenture. 

Payments. 
 Subject to
the terms and conditions of the Indenture, the Company will make all payments and deliveries in respect of the Fundamental Change Repurchase Price on the Fundamental Change Repurchase Date, the Redemption Price on any Redemption Date and the
Capitalized Principal Amount on the Maturity Date, as the case may be, to the Holder who surrenders a Note to a Paying Agent to collect such payments in respect of the Note. The Company will pay cash amounts in money of the United States that at the
time of payment is legal tender for payment of public and private debts. 

  
 R-2 












 Amendments and Waivers. 

The Indenture contains provisions permitting in certain circumstances, without the consent of the Holders of the Notes, and in certain other
circumstances, with the consent of the Holders of not less than a majority in aggregate principal amount of the Notes at the time outstanding, evidenced as in the Indenture provided, the amendment of the Notes and/or execution of supplemental
indentures modifying the terms of the Notes and/or the Indenture as described therein. It is also provided in the Indenture that, subject to certain exceptions, the Holders of a majority in aggregate principal amount of the Notes at the time
outstanding may on behalf of the Holders of all of the Notes waive any past Default or Event of Default under the Indenture and its consequences. 

Right to Payments. 
 Each
Holder shall have the right to receive payment or delivery, as the case may be, of (x) the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, (y) accrued and unpaid interest, if any,
on, and (z) the consideration due upon conversion of, this Note at the place, at the respective times, at the rate and in the lawful money or shares of Common Stock, as the case may be, herein prescribed. 

Registered Form; Denominations; Transfer and Exchange. 

The Notes are issuable in registered form without coupons in denominations of $1.00 principal amount and integral multiples thereof. At the
office or agency of the Company referred to herein, and in the manner and subject to the limitations provided in the Indenture, Notes may be exchanged for a like aggregate principal amount of Notes of other authorized denominations, without payment
of any service charge but, if required by the Company, with payment of a sum sufficient to cover any transfer or similar tax that may be imposed in connection therewith as a result of the name of the Holder of the new Notes issued upon such exchange
of Notes being different from the name of the Holder of the old Notes surrendered for such exchange. 
 Redemption. 

The Notes shall be redeemable at the Company’s option at any time, and from time to time, in accordance with the terms and subject to the
conditions specified in the Indenture. No sinking fund is provided for the Notes. 
 Fundamental Change Repurchase Right. 

Upon the occurrence of a Fundamental Change, the Holder has the right, at such Holder’s option, to require the Company to repurchase for
cash all of such Holder’s Notes or any portion thereof (in principal amounts of $1,000 or integral multiples of $1.00 in excess thereof) on the Fundamental Change Repurchase Date at a price equal to the Fundamental Change Repurchase Price. 


  
 R-3 












 Holder Conversion Rights. 

Subject to the provisions of the Indenture, the Holder hereof has the right, at its option prior to the close of business on the Business Day
immediately preceding the Maturity Date, to convert any Notes or portion thereof that is $1,000 or an integral multiple of $1.00 in excess thereof, into cash, shares of Common Stock or a combination of cash and shares of Common Stock, as applicable,
at the Conversion Rate specified in the Indenture, as adjusted from time to time as provided in the Indenture. 
 Company Conversion
Rights. 
 Subject to the provisions of the Indenture, the Company hereof has the right, at its option at any time, and from time to
time, to convert any Notes or portion thereof that is $1,000 or an integral multiple of $1.00 in excess thereof, into shares of Common Stock, at the Conversion Rate specified in the Indenture, as adjusted from time to time as provided in the
Indenture. 

  
 R-4 












 ABBREVIATIONS 

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

UNIF GIFT MIN ACT = Uniform Gifts to Minors Act 
 CUST =
Custodian 
 TEN ENT = as tenants by the entireties 
 JT TEN =
joint tenants with right of survivorship and not as tenants in common Additional abbreviations may also be used though not in the above list. 
  

  
 R-5 












 ATTACHMENT 1 

[FORM OF NOTICE OF CONVERSION] 

Aspen Aerogels, Inc. 
 Convertible
Senior PIK Toggle Notes due 2027 
 To:    Aspen Aerogels, Inc. 

30 Forbes Road, Building B 

Northborough, MA 01532 
 The
undersigned registered owner of this Note hereby exercises the option to convert this Note, or the portion hereof (that is $1,000 principal amount or an integral multiple of $1.00 in excess thereof) below designated, into cash, shares of Common
Stock or a combination of cash and shares of Common Stock, as applicable, in accordance with the terms of the Indenture referred to in this Note, and directs that any cash payable and any shares of Common Stock issuable and deliverable upon such
conversion, together with any cash for any fractional share, and any Notes representing any unconverted principal amount hereof, be issued and delivered to the registered Holder hereof unless a different name has been indicated below. If any shares
of Common Stock or any portion of this Note not converted are to be issued in the name of a Person other than the undersigned, the undersigned will pay all documentary, stamp or similar issue or transfer taxes, if any in accordance with
Section 14.02(d) and Section 14.02(e) of the Indenture. Any amount required to be paid to the undersigned on account of interest accompanies this Note. Capitalized terms used herein but not defined shall have the meanings ascribed to such
terms in the Indenture. 
  

			
	Dated:	 	  

	
	  

	Signature(s)
	
	  

	Signature Guarantee
	
	Signature(s) must be guaranteed by an eligible Guarantor Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an approved signature guarantee medallion program pursuant
to Securities and Exchange Commission Rule 17Ad-15 if shares of Common Stock are to be issued, or Notes are to be delivered, other than to and in the name of the registered holder.


  
 1 













	
	Fill in for registration of shares if to be issued, and Notes if to be delivered, other than to and in the name of the registered holder:
	
	  

	(Name)
	
	  

	(Street Address)
	
	  

	(City, State and Zip Code)
	Please print name and address

  

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

	Social Security or Other Taxpayer
	Identification Number



  
 2 












 ATTACHMENT 2 

[FORM OF FUNDAMENTAL CHANGE REPURCHASE NOTICE] 

Aspen Aerogels, Inc. 
 Convertible
Senior PIK Toggle Notes due 2027 
 To:    Aspen Aerogels, Inc. 

30 Forbes Road, Building B 

Northborough, MA 01532 
 The
undersigned registered owner of this Note hereby acknowledges receipt of a notice from Aspen Aerogels, Inc. (the “Company”) as to the occurrence of a Fundamental Change with respect to the Company and specifying the Fundamental
Change Repurchase Date and requests and instructs the Company to pay to the registered holder hereof in accordance with Section 15.02 of the Indenture referred to in this Note the applicable Fundamental Change Repurchase Price. Capitalized
terms used herein but not defined shall have the meanings ascribed to such terms in the Indenture. 
 In the case of Physical Notes, the
certificate numbers of the Notes to be repurchased are as set forth below: 
  

			
	Dated:	 	  

	
	  

	Signature(s)

  

	
	  

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



  
 1 












 ATTACHMENT 3 

[FORM OF ASSIGNMENT AND TRANSFER] 

Aspen Aerogels, Inc. 
 Convertible
Senior PIK Toggle Notes due 2027 
 For value received _______________ hereby sell(s), assign(s) and transfer(s) unto __________ (Please insert social
security or Taxpayer Identification Number of assignee) the within Note, and hereby irrevocably constitutes and appoints ____________________ attorney to transfer the said Note on the books of the Company, with full power of substitution in the
premises. 
 In connection with any transfer of the within Note, the undersigned confirms that such Note is being transferred: 

☐    To Aspen Aerogels, Inc. or a subsidiary thereof; or 

☐    Pursuant to a registration statement that has become or been declared effective under the Securities Act of 1933, as amended;
or 
 ☐    Pursuant to and in compliance with Rule 144 under the Securities Act of 1933, as amended, or any other available
exemption from the registration requirements of the Securities Act of 1933, as amended. 
  

			
	Dated:	 	  

	
	  

	
	  

	Signature(s)
	
	  

	Signature Guarantee
	
	Signature(s) must be guaranteed by an eligible Guarantor Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an approved signature guarantee medallion program pursuant
to Securities and Exchange Commission Rule 17Ad-15 if Notes are to be delivered, other than to and in the name of the registered holder.

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

  
 1 












 EXHIBIT A – FORM OF INDENTURE 











  

 
 ASPEN AEROGELS, INC. 

AND 
 [TRUSTEE], 

as Trustee 
 INDENTURE 

Dated as of [_____] 
 Convertible
Senior PIK Toggle Notes due 2027 
  
  

 











 TABLE OF CONTENTS 

 

							
	 	 	 	  	Page	 
			
	 Article 1.
	 	 Definitions
	  	 	1	 
			
	 Section 1.01.
	 	 Definitions
	  	 	1	 
	 Section 1.02.
	 	 References to Interest
	  	 	13	 
			
	 Article 2.
	 	 Issue, Description, Execution, Registration and Exchange of Notes
	  	 	14	 
			
	 Section 2.01.
	 	 Designation and Amount
	  	 	14	 
	 Section 2.02.
	 	 Form of Notes
	  	 	14	 
	 Section 2.03.
	 	 Date and Denomination of Notes; Payments of Interest and Defaulted Amounts
	  	 	15	 
	 Section 2.04.
	 	 Execution, Authentication and Delivery of Notes
	  	 	17	 
	 Section 2.05.
	 	 Exchange and Registration of Transfer of Notes; Restrictions on Transfer; Depositary
	  	 	18	 
	 Section 2.06.
	 	 Mutilated, Destroyed, Lost or Stolen Notes
	  	 	23	 
	 Section 2.07.
	 	 Temporary Notes
	  	 	24	 
	 Section 2.08.
	 	 Cancellation of Notes Paid, Converted, Etc
	  	 	24	 
	 Section 2.09.
	 	 CUSIP Numbers
	  	 	25	 
	 Section 2.10.
	 	 Additional Notes; Repurchases
	  	 	25	 
			
	 Article 3.
	 	 Satisfaction and Discharge
	  	 	25	 
			
	 Section 3.01.
	 	 Satisfaction and Discharge
	  	 	25	 
			
	 Article 4.
	 	 Particular Covenants of the Company
	  	 	26	 
			
	 Section 4.01.
	 	 Payment of Principal and Interest
	  	 	26	 
	 Section 4.02.
	 	 Maintenance of Office or Agency
	  	 	26	 
	 Section 4.03.
	 	 Appointments to Fill Vacancies in Trustee’s Office
	  	 	26	 
	 Section 4.04.
	 	 Provisions as to Paying Agent
	  	 	26	 
	 Section 4.05.
	 	 Rule 144A Information Requirement and Annual Reports
	  	 	28	 
	 Section 4.06.
	 	 Reports
	  	 	28	 
	 Section 4.07.
	 	 Stay, Extension and Usury Laws
	  	 	28	 
	 Section 4.08.
	 	 Compliance Certificate; Statements as to Defaults
	  	 	28	 
			
	 Article 5.
	 	 Lists of Holders and Reports by the Company and the Trustee
	  	 	29	 
			
	 Section 5.01.
	 	 Lists of Holders
	  	 	29	 
	 Section 5.02.
	 	 Preservation and Disclosure of Lists
	  	 	29	 
			
	 Article 6.
	 	 Defaults and Remedies
	  	 	29	 
			
	 Section 6.01.
	 	 Events of Default
	  	 	29	 
	 Section 6.02.
	 	 Acceleration; Rescission and Annulment
	  	 	30	 
	 Section 6.03.
	 	 Payments of Notes on Default; Suit Therefor
	  	 	31	 
	 Section 6.04.
	 	 Application of Monies Collected by Trustee
	  	 	33	 
	 Section 6.05.
	 	 Proceedings by Holders
	  	 	34	 
	 Section 6.06.
	 	 Proceedings by Trustee
	  	 	35	 
	 Section 6.07.
	 	 Remedies Cumulative and Continuing
	  	 	35	 


  
 i 













							
	 Section 6.08.
	 	 Direction of Proceedings and Waiver of Defaults by Majority of Holders
	  	 	35	 
	 Section 6.09.
	 	 Notice of Defaults
	  	 	36	 
	 Section 6.10.
	 	 Undertaking to Pay Costs
	  	 	36	 
			
	Article 7.	 	 Concerning the Trustee
	  	 	36	 
			
	 Section 7.01.
	 	 Duties and Responsibilities of Trustee
	  	 	36	 
	 Section 7.02.
	 	 Reliance on Documents, Opinions, Etc
	  	 	38	 
	 Section 7.03.
	 	 No Responsibility for Recitals, Etc
	  	 	39	 
	 Section 7.04.
	 	 Trustee, Paying Agents, Conversion Agents or Note Registrar May Own Notes
	  	 	39	 
	 Section 7.05.
	 	 Monies and Shares of Common Stock to Be Held in Trust
	  	 	39	 
	 Section 7.06.
	 	 Compensation and Expenses of Trustee
	  	 	39	 
	 Section 7.07.
	 	 Officer’s Certificate as Evidence
	  	 	40	 
	 Section 7.08.
	 	 Eligibility of Trustee
	  	 	40	 
	 Section 7.09.
	 	 Resignation or Removal of Trustee
	  	 	40	 
	 Section 7.10.
	 	 Acceptance by Successor Trustee
	  	 	41	 
	 Section 7.11.
	 	 Succession by Merger, Etc
	  	 	42	 
	 Section 7.12.
	 	 Trustee’s Application for Instructions from the Company
	  	 	43	 
			
	Article 8.	 	 Concerning the Holders
	  	 	43	 
			
	 Section 8.01.
	 	 Action by Holders
	  	 	43	 
	 Section 8.02.
	 	 Proof of Execution by Holders
	  	 	43	 
	 Section 8.03.
	 	 Who Are Deemed Absolute Owners
	  	 	43	 
	 Section 8.04.
	 	 Company-Owned Notes Disregarded
	  	 	44	 
	 Section 8.05.
	 	 Revocation of Consents; Future Holders Bound
	  	 	44	 
			
	Article 9.	 	 Holders’ Meetings
	  	 	44	 
			
	 Section 9.01.
	 	 Purpose of Meetings
	  	 	44	 
	 Section 9.02.
	 	 Call of Meetings by Trustee
	  	 	45	 
	 Section 9.03.
	 	 Call of Meetings by Company or Holders
	  	 	45	 
	 Section 9.04.
	 	 Qualifications for Voting
	  	 	45	 
	 Section 9.05.
	 	 Regulations
	  	 	45	 
	 Section 9.06.
	 	 Voting
	  	 	46	 
	 Section 9.07.
	 	 No Delay of Rights by Meeting
	  	 	46	 
			
	Article 10.	 	 Supplemental Indentures
	  	 	47	 
			
	 Section 10.01.
	 	 Supplemental Indentures Without Consent of Holders
	  	 	47	 
	 Section 10.02.
	 	 Supplemental Indentures with Consent of Holders
	  	 	48	 
	 Section 10.03.
	 	 Effect of Supplemental Indentures
	  	 	49	 
	 Section 10.04.
	 	 Notation on Notes
	  	 	49	 
	 Section 10.05.
	 	 Evidence of Compliance of Supplemental Indenture to Be Furnished Trustee
	  	 	49	 
			
	Article 11.	 	 Consolidation, Merger, Sale, Conveyance and Lease
	  	 	49	 
			
	 Section 11.01.
	 	 Company May Consolidate, Etc. on Certain Terms
	  	 	49	 
	 Section 11.02.
	 	 Successor Corporation to Be Substituted
	  	 	50	 
	 Section 11.03.
	 	 Delivery of Officer’s Certificate and Opinion of Counsel to the Trustee
	  	 	51	 


  
 ii 













							
			
	Article 12.	 	 Immunity of Incorporators, Stockholders, Officers and Directors
	  	 	51	 
			
	 Section 12.01.
	 	 Indenture and Notes Solely Corporate Obligations
	  	 	51	 
			
	Article 13.	 	 Company’s Right to Conversion of Notes
	  	 	51	 
			
	 Section 13.01.
	 	 Conversion Right
	  	 	51	 
	 Section 13.02.
	 	 Mechanics of Conversion
	  	 	52	 
			
	Article 14.	 	 Holder’s Right to Conversion of Notes
	  	 	57	 
			
	 Section 14.01.
	 	 Conversion Privilege
	  	 	57	 
	 Section 14.02.
	 	 Conversion Procedure; Settlement Upon Conversion
	  	 	57	 
	 Section 14.03.
	 	 Adjustment of Conversion Rate
	  	 	62	 
	 Section 14.04.
	 	 Adjustments of Prices
	  	 	71	 
	 Section 14.05.
	 	 Shares to Be Fully Paid
	  	 	71	 
	 Section 14.06.
	 	 Effect of Recapitalizations, Reclassifications and Changes of the Common Stock
	  	 	72	 
	 Section 14.07.
	 	 Certain Covenants
	  	 	73	 
	 Section 14.08.
	 	 Responsibility of Trustee
	  	 	74	 
	 Section 14.09.
	 	 Stockholder Rights Plans
	  	 	74	 
	 Section 14.10.
	 	 Limit on Issuance of Shares of Common Stock Upon Conversion
	  	 	74	 
	 Section 14.11.
	 	 Exchange in Lieu of Conversion
	  	 	75	 
			
	Article 15.	 	 Repurchase of Notes at Option of Holders
	  	 	75	 
			
	 Section 15.01.
	 	 Intentionally Omitted
	  	 	75	 
	 Section 15.02.
	 	 Repurchase at Option of Holders Upon a Fundamental Change
	  	 	75	 
	 Section 15.03.
	 	 Withdrawal of Fundamental Change Repurchase Notice
	  	 	78	 
	 Section 15.04.
	 	 Deposit of Fundamental Change Repurchase Price
	  	 	78	 
	 Section 15.05.
	 	 Compliance with Applicable Laws Upon Repurchase of Notes
	  	 	79	 
			
	Article 16.	 	 Optional Redemption
	  	 	79	 
			
	 Section 16.01.
	 	 Optional Redemption
	  	 	79	 
	 Section 16.02.
	 	 Notice of Optional Redemption; Selection of Notes
	  	 	80	 
	 Section 16.03.
	 	 Payment of Notes Called for Redemption
	  	 	81	 
	 Section 16.04.
	 	 Restrictions on Redemption
	  	 	81	 
			
	Article 17.	 	 Miscellaneous Provisions
	  	 	81	 
			
	 Section 17.01.
	 	 Provisions Binding on Company’s Successors
	  	 	81	 
	 Section 17.02.
	 	 Official Acts by Successor Corporation
	  	 	81	 
	 Section 17.03.
	 	 Addresses for Notices, Etc
	  	 	81	 
	 Section 17.04.
	 	 Governing Law; Jurisdiction
	  	 	82	 
	 Section 17.05.
	 	 Evidence of Compliance with Conditions Precedent; Certificates and Opinions of Counsel to
Trustee
	  	 	83	 
	 Section 17.06.
	 	 Legal Holidays
	  	 	83	 
	 Section 17.07.
	 	 No Security Interest Created
	  	 	83	 
	 Section 17.08.
	 	 Benefits of Indenture
	  	 	83	 


  
 iii 













							
	 Section 17.09.
	 	 Table of Contents, Headings, Etc
	  	 	83	 
	 Section 17.10.
	 	 Authenticating Agent
	  	 	84	 
	 Section 17.11.
	 	 Execution in Counterparts
	  	 	85	 
	 Section 17.12.
	 	 Severability
	  	 	85	 
	 Section 17.13.
	 	 Waiver of Jury Trial
	  	 	85	 
	 Section 17.14.
	 	 Force Majeure
	  	 	85	 
	 Section 17.15.
	 	 Calculations
	  	 	85	 
	 Section 17.16.
	 	 USA PATRIOT Act
	  	 	85	 
	 Section 17.17.
	 	 Withholding Taxes
	  	 	86	 

 EXHIBIT 
  

							
	Exhibit A	 	 Form of Note
	  	 	A-1	 


  
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 INDENTURE dated as of [_____] between ASPEN AEROGELS, INC., a Delaware corporation, as
issuer (the “Company,” as more fully set forth in Section 1.01) and [TRUSTEE], a [Insert Type of Entity], as trustee (the “Trustee,” as more fully set forth in Section 1.01). 

W I T N E S S E T H: 
 WHEREAS,
for its lawful corporate purposes, the Company has duly authorized the issuance of its Convertible Senior PIK Toggle Notes due 2027 (the “Notes”), and in order to provide the terms and conditions upon which the Notes are to be
authenticated, issued and delivered, the Company has duly authorized the execution and delivery of this Indenture; and 
 WHEREAS, the Form
of Note, the certificate of authentication to be borne by each Note, the Form of Notice of Conversion, the Form of Fundamental Change Repurchase Notice and the Form of Assignment and Transfer to be borne by the Notes are to be substantially in the
forms hereinafter provided; and 
 WHEREAS, all acts and things necessary to make the Notes, when executed by the Company and authenticated
and delivered by the Trustee or a duly authorized authenticating agent, as in this Indenture provided, the valid, binding and legal obligations of the Company, and this Indenture a valid agreement according to its terms, have been done and
performed, and the execution of this Indenture and the issuance hereunder of the Notes have in all respects been duly authorized. 
 NOW,
THEREFORE, THIS INDENTURE WITNESSETH: 
 That in order to declare the terms and conditions upon which the Notes are, and are to be,
authenticated, issued and delivered, and in consideration of the premises and of the purchase and acceptance of the Notes by the Holders thereof, the Company covenants and agrees with the Trustee for the equal and proportionate benefit of the
respective Holders from time to time of the Notes (except as otherwise provided below), as follows: 
 Article
1.    Definitions 
 Section 1.01.    Definitions. The terms defined in this
Section 1.01 (except as herein otherwise expressly provided or unless the context otherwise requires) for all purposes of this Indenture and of any indenture supplemental hereto shall have the respective meanings specified in this
Section 1.01. The words “herein,” “hereof,” “hereunder” and words of similar import refer to this Indenture as a whole and not to any particular Article, Section or other subdivision. The terms defined in this
Article include the plural as well as the singular. 
 “Affiliate” of any specified Person means any other Person directly
or indirectly controlling or controlled by or under direct or indirect common control with such specified Person. For the purposes of this definition, “control,” when used with respect to any specified Person means the power to direct or
cause the direction of the management and policies of such Person, directly or indirectly, whether through the ownership of voting securities, by contract or otherwise; and the terms “controlling” and “controlled” have meanings
correlative to the foregoing. Notwithstanding anything to the contrary herein, the determination of whether one Person is an “Affiliate” of another Person for purposes of this Indenture shall be made based on the facts at the time
such determination is made or required to be made, as the case may be, hereunder. 











 “Applicable Withholding Agent” shall have the meaning specified in
Section 17.17. 
 “Board of Directors” means the board of directors or equivalent body of the Company or a committee
of such board or body duly authorized to act for it hereunder. 
 “Board Resolution” means a copy of a resolution certified
by the Secretary or an Assistant Secretary of the Company to have been duly adopted by the Board of Directors, and to be in full force and effect on the date of such certification, and delivered to the Trustee. 

“Business Combination Event” shall have the meaning specified in Section 11.01. 

“Business Day” means, with respect to any Note, any day other than a Saturday, a Sunday or a day on which the Federal Reserve
Bank of New York is authorized or required by law or executive order to close or be closed. 
 “Capital Stock” means, for
any entity, any and all shares, interests, rights to purchase, warrants, options, participations or other equivalents of or interests in (however designated) stock issued by that entity, but shall not include any debt securities convertible into or
exchangeable for any securities otherwise constituting Capital Stock pursuant to this definition. 
 “Capitalization
Amount” means, for any Interest PIK Date, an amount per Note equal to the interest accrued on the Capitalized Principal Amount as of the immediately preceding Interest Payment Date (or, if there is no immediately preceding Interest Payment
Date, the interest accrued on the Initial Principal Amount) and not paid in cash, calculated at the PIK Interest Rate on the Capitalized Principal Amount of such Note for which interest is not paid in cash for the period from, and including, such
immediately preceding Interest Payment Date (or, if there is no immediately preceding Interest Payment Date, from, and including, the Issue Date) to, but excluding, such Interest PIK Date. 

“Capitalization Method” shall have the meaning specified in Section 2.03(d)(i). 

“Capitalized Principal Amount” means, for any date, the principal amount per Note equal to the Initial Principal Amount of
such Note, as increased on each Interest PIK Date occurring on or prior to such date by the Capitalization Amount for such Interest PIK Date, if any. When the term “principal amount” of any Note is used herein, such reference(s) shall be
deemed to be reference(s) to the Capitalized Principal Amount of such Note, unless the context otherwise requires. 
 “Cash Interest
Rate” means the Floating Rate + 5.50% per annum. 
 “Cash Method” shall have the meaning specified in
Section 2.03(d)(i). 
 “Cash Settlement” shall have the meaning specified in Section 14.02(a). 

“Clause A Distribution” shall have the meaning specified in Section 14.03(c). 

  
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 “Clause B Distribution” shall have the meaning specified in
Section 14.03(c). 
 “Clause C Distribution” shall have the meaning specified in Section 14.03(c). 

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

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

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

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

“Common Stock” means the common stock of the Company, par value $0.00001 per share, at the date of this Indenture, subject to
Section 14.06. 
 “Company” shall have the meaning specified in the first paragraph of this Indenture, and subject to
the provisions of Article 11, shall include its successors and assigns. 
 “Company Conversion Default Settlement Method”
means the Company Conversion Physical Settlement. 
 “Company Conversion Settlement Method” means, with respect to any
Company Conversion Right, Company Conversion Physical Settlement, Company Conversion Cash Settlement or Company Conversion Combination Settlement, as elected (or deemed to have been elected) by the Company. 

“Company Conversion Specified Dollar Amount” means the maximum cash amount per $1,000 Conversion Amount to be received
upon conversion as specified in the Company Conversion Settlement Notice (or deemed specified as provided in Section 13.02(a)(iii)) related to any converted Notes. 

“Company Order” means a written order of the Company, signed by any of its Officers. 

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

“Conversion Amount” shall have the meaning specified in Section 13.01. 

“Conversion Consideration” shall have the meaning specified in Section 14.11(a). 

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

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

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

  
 3 












 “Conversion Rate” shall have the meaning specified in Section 13.01.

 “Conversion Right” shall have the meaning specified in Section 13.01. 

“Corporate Trust Office” means the principal office of the Trustee at which at any time its corporate trust business shall be
administered, which office at the date of this Indenture is located at [Address], Attention: [_______], or such other address as the Trustee may designate from time to time by notice to the Holders and the Company, or the principal corporate
trust office of any successor trustee (or such other address as such successor trustee may designate from time to time by notice to the Holders and the Company). 

“Custodian” means the Trustee, as custodian for the Depositary, with respect to the Global Notes, or any successor entity
thereto. 
 “Cut-off Date” means the 45th Scheduled Trading Day immediately preceding the Maturity Date. 
 “Daily
Conversion Value” means, for each of the 40 consecutive Trading Days during the Observation Period, 2.5% of the product of (a) the Conversion Rate on such Trading Day and (b) the Daily VWAP for such Trading Day. 

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

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

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

“Daily VWAP” means, for each of the 40 consecutive Trading Days during the relevant Observation Period, the per share
volume-weighted average price as displayed under the heading “Bloomberg VWAP” on Bloomberg page “ASPN <equity> AQR” (or its equivalent successor if such page is not available) in respect of the period from the scheduled
open of trading until the scheduled close of trading of the primary trading session on such Trading Day (or if such volume-weighted average price is unavailable, the market value of one share of the Common Stock on such Trading Day determined, using
a volume-weighted average method, by a nationally recognized independent investment banking firm retained for this purpose by the Company). The “Daily VWAP” shall be determined without regard to after-hours trading or any other
trading outside of the regular trading session trading hours. 
 “Default” means any event that is, or after notice or
passage of time, or both, would be, an Event of Default. 

  
 4 












 “Default Settlement Method” means, initially, Physical Settlement. 

“Defaulted Amounts” means any amounts on any Note (including, without limitation, the Redemption Price, the Fundamental
Change Repurchase Price, principal and interest) that are payable but are not punctually paid or duly provided for. 

“Depositary” means, with respect to each Global Note, the Person designated pursuant to Section 2.05(c) as the
Depositary with respect to such Notes, until a successor shall have been appointed and become such pursuant to the applicable provisions of this Indenture, and thereafter, “Depositary” shall mean or include such successor. 

“Designated Financial Institution” shall have the meaning specified in Section 14.11(a). 

“Distributed Property” shall have the meaning specified in Section 14.03(c). 

“Effective Date” means the first date on which shares of the Common Stock trade on the applicable exchange or in the
applicable market, regular way, relecting the relevant share split or share combination, as applicable. 
 “Event of
Default” shall have the meaning specified in Section 6.01. 
 “Ex-Dividend
Date” means the first date on which shares of the Common Stock trade on the applicable exchange or in the applicable market, regular way, without the right to receive the issuance, dividend or distribution in question, from the Company or,
if applicable, from the seller of Common Stock on such exchange or market (in the form of due bills or otherwise) as determined by such exchange or market. 

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

 “Exchange Election” shall have the meaning specified in Section 14.11(a). 

“Floating Rate” means, with respect to each Interest Date, the rate per annum equal to the Secured Overnight Financing Rate
(SOFR) as published by the Federal Reserve Bank of New York two Business Days prior to such Interest Date; provided, that, in no event shall the Floating Rate be less than 1% per annum nor more than 3% per annum. 

“Form of Assignment and Transfer” means the “Form of Assignment and Transfer” attached as Attachment 3 to the Form
of Note attached hereto as Exhibit A. 
 “Form of Fundamental Change Repurchase Notice” means the “Form of Fundamental
Change Repurchase Notice” attached as Attachment 2 to the Form of Note attached hereto as Exhibit A. 
 “Form of Note”
means the “Form of Note” attached hereto as Exhibit A. 

  
 5 












 “Form of Notice of Conversion” means the “Form of Notice of
Conversion” attached as Attachment 1 to the Form of Note attached hereto as Exhibit A. 
 “Fundamental Change” shall
be deemed to have occurred at the time after the Notes are originally issued if any of the following occurs: 

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

(b)    the consummation of (A) any recapitalization, reclassification or change of the Common Stock
(other than a change to par value or changes resulting from a subdivision or combination) as a result of which the Common Stock would be converted into, or exchanged for, stock, other securities, other property or assets; (B) any share
exchange, consolidation or merger of the Company pursuant to which the Common Stock will be converted into cash, securities or other property or assets; or (C) any sale, lease or other transfer in one transaction or a series of transactions of
all or substantially all of the consolidated assets of the Company and its Subsidiaries, taken as a whole, to any Person other than one or more of the Company’s direct or indirect Wholly Owned Subsidiaries; provided, however, that
a transaction described in clause (A) or (B) in which the holders of all classes of the Company’s Common Equity immediately prior to such transaction own, directly or indirectly, more than 50% of all classes of Common Equity of the
continuing or surviving Person or transferee or the parent thereof immediately after such transaction in substantially the same proportions as such ownership immediately prior to such transaction shall not be a Fundamental Change pursuant to this
clause (b); 
 (c)    the Company’s stockholders approve any plan or proposal for the liquidation or
dissolution of the Company; or 
 (d)    the Common Stock ceases to be listed or quoted on any National
Securities Exchange, as defined in the Exchange Act, including, but not limited to, The New York Stock Exchange, The Nasdaq Global Market, The Nasdaq Global Select Market or The Nasdaq Capital Market (or any of their respective successors). 

If any transaction in which the Common Stock is replaced by the common stock or other Common Equity of another entity occurs, following any
related Fundamental Change Repurchase Date (or, in the case of a transaction that would have been a Fundamental Change but for the proviso in clause (b) of this definition, following the effective date of such transaction), references to
the Company in this definition shall instead be references to such other entity. 

  
 6 












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

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

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

The terms “given”, “mailed”, “notify” or “sent” with respect to any notice
to be given to a Holder pursuant to this Indenture, shall mean notice (x) given to the Depositary (or its designee) pursuant to the standing instructions from the Depositary or its designee, including by electronic mail in accordance with
accepted practices or procedures at the Depositary (in the case of a Global Note) or (y) mailed to such Holder by first class mail, postage prepaid, at its address as it appears on the Note Register, or sent electronically to an email address
specified by the Company to the Trustee and the Holders (in the case of a Physical Note), in each case, in accordance with Section 17.03. Notice so “given” shall be deemed to include any notice to be “mailed” or
“delivered,” as applicable, under this Indenture. 
 “Global Note” shall have the meaning specified in
Section 2.05(b). 
 “Governmental Approval” shall have the meaning specified in Section 13.02(a)(vi). 

“Governmental Entity” means any court, administrative agency or commission or other governmental authority or
instrumentality, whether federal, state, local or foreign, and any applicable self-regulatory organization (including the New York Stock Exchange). 

“Holder,” as applied to any Note, or other similar terms (but excluding the term “beneficial holder”), means any
Person in whose name at the time a particular Note is registered on the Note Register. 
 “Indenture” means this
instrument, as amended or supplemented from time to time. 
 “Initial Principal Amount” of any Note means the principal
amount of such Note at the time of original issuance of such Note. For the avoidance of doubt, the “Initial Principal Amount” of each minimum denomination of Notes on the Issue Date shall be $1,000. 

“Interest Payment Date” means each June 30 and December 30 of each year, beginning on June 30, 2022. 

“Interest PIK Date” means each Interest Payment Date with respect to which the Company elects (or is deemed to have elected)
to pay interest accrued on the Notes to, but excluding, such Interest Payment Date by the Capitalization Method pursuant to Section 2.03(d) hereof. 

  
 7 












 “Issue Date” means February 18, 2022. 

“Last Reported Sale Price” of the Common Stock on any date means the closing sale price per share (or if no closing sale
price is reported, the average of the bid and ask prices or, if more than one in either case, the average of the average bid and the average ask prices) on that date as reported in composite transactions for the principal U.S. national or regional
securities exchange on which the Common Stock is traded. If the Common Stock is not listed for trading on a U.S. national or regional securities exchange on the relevant date, the “Last Reported Sale Price” shall be the last quoted
bid price for the Common Stock in the over-the-counter market on the relevant date as reported by OTC Markets Group Inc. or a similar organization. If the Common Stock
is not so quoted, the “Last Reported Sale Price” shall be the average of the mid-point of the last bid and ask prices for the Common Stock on the relevant date from a nationally recognized
independent investment banking firm selected by the Company for this purpose. 
 “Make-Whole Amount” means, with respect to
the Company’s Conversion Right pursuant to Article 13, Company’s Optional Redemption right pursuant to Article 16 or the Fundamental Change Repurchase Right of the Holder, pursuant to Section 15.02, the sum of the present value,
calculated using a discount rate equal to the Treasury Rate in respect of such Redemption Date or Fundamental Change Repurchase Date, as applicable, plus 100 basis points (and discounted on a semi-annual basis (assuming a 360 day year consisting of
twelve 30 day months)), of all interest payments on the Capitalized Principal Amount of the Notes being redeemed, converted or repurchased that the Holder of such Notes would have been entitled to receive had such Notes remained outstanding,
beginning the day after such redemption, conversion or fundamental change through the Maturity Date, but for the occurrence of such redemption, conversion or fundamental change, assuming the Company had elected the Cash Method on each Interest
Payment Date; provided that for purposes of such calculation, the Floating Rate shall be deemed to be the Floating Rate in effect at the time of the exercise of the Company’s Conversion Right pursuant to Article 13, the Company’s Optional
Redemption right pursuant to Article 16 or the Fundamental Change Repurchase Right of the Holder, pursuant to Section 15.02, as applicable. 

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

“Maturity Date” means February 18, 2027. 

“Merger Event” shall have the meaning specified in Section 14.06(a). 

  
 8 












 “Note” or “Notes” shall have the meaning specified in the
first paragraph of the recitals of this Indenture. 
 “Note Register” shall have the meaning specified in
Section 2.05(a). 
 “Note Registrar” shall have the meaning specified in Section 2.05(a). 

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

“Observation Period” with respect to any Note surrendered for conversion means: (i) subject to clause (ii), if the
relevant Conversion Date occurs prior to the Cut-off Date, the 40 consecutive Trading Days beginning on, and including, the third Trading Day immediately succeeding such Conversion Date; (ii) if the
relevant Conversion Date occurs on or after the date of the Company’s issuance of a Redemption Notice with respect to the Notes pursuant to Section 16.02 and prior to the relevant Redemption Date, the 40 consecutive Trading Days beginning
on, and including, the 42nd Scheduled Trading Day immediately preceding such Redemption Date; and (iii) subject to clause (ii), if the relevant Conversion Date occurs on or after the Cut-off Date, the 40 consecutive Trading Days beginning on, and including, the 42nd Scheduled Trading Day immediately preceding the Maturity Date. 

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

“Officer’s Certificate,” when used with respect to the Company, means a certificate that is delivered to the Trustee and
that is signed by any Officer of the Company. Each such certificate shall include the statements provided for in Section 17.05 if and to the extent required by the provisions of such Section. The Officer giving an Officer’s Certificate
pursuant to Section 4.08 shall be the principal executive, financial or accounting officer of the Company. 
 “open of
business” means 9:00 a.m. (New York City time). 
 “Opinion of Counsel” means an opinion in writing signed by
legal counsel, who may be an employee of or counsel to the Company, or other counsel acceptable to the Trustee, that is delivered to the Trustee. Each such opinion shall include the statements provided for in Section 17.05 if and to the extent
required by the provisions of such Section 17.05. 
 “Optional Redemption” shall have the meaning specified in
Section 16.01. 
 “outstanding,” when used with reference to Notes, shall, subject to the provisions of
Section 8.04, mean, as of any particular time, all Notes authenticated and delivered by the Trustee under this Indenture, except: 

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

  
 9 












 (b)    Notes, or portions thereof, that have become due
and payable and in respect of which monies in the necessary amount shall have been deposited in trust with the Trustee or with any Paying Agent (other than the Company) or shall have been set aside and segregated in trust by the Company (if the
Company shall act as its own Paying Agent); 
 (c)    Notes that have been paid pursuant to
Section 2.06 or Notes in lieu of which, or in substitution for which, other Notes shall have been authenticated and delivered pursuant to the terms of Section 2.06 unless proof satisfactory to the Trustee is presented that any such Notes
are held by protected purchasers in due course; 
 (d)    Notes converted pursuant to Article 14 and
required to be cancelled pursuant to Section 2.08; 
 (e)    Notes redeemed pursuant to Article 16;

 (f)    Notes converted pursuant to Article 13 and required to be cancelled pursuant to
Section 2.08; and 
 (f)    Notes repurchased by the Company pursuant to the penultimate sentence of
Section 2.10. 
 “Paying Agent” shall have the meaning specified in Section 4.02. 

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

“Physical Notes” means permanent certificated Notes in registered form issued in denominations of $1.00 principal amount and
integral multiples thereof. 
 “Physical Settlement” shall have the meaning specified in Section 14.02(a). 

“PIK Interest” means any interest paid pursuant to Section 2.03(d) by the Capitalization Method or by the issuance of
PIK Notes. 
 “PIK Interest Rate” means the Floating Rate + 6.50% per annum. 

“PIK Notes” shall have the meaning specified in Section 2.03(d)(ii). 

“PIK Payment” means the payment of any PIK Interest on the Notes. 

“Predecessor Note” of any particular Note means every previous Note evidencing all or a portion of the same debt as that
evidenced by such particular Note; and, for the purposes of this definition, any Note authenticated and delivered under Section 2.06 in lieu of or in exchange for a mutilated, lost, destroyed or stolen Note shall be deemed to evidence the same
debt as the mutilated, lost, destroyed or stolen Note that it replaces. 

  
 10 












 “Record Date” means, with respect to any dividend, distribution or other
transaction or event in which the holders of Common Stock (or other applicable security) have the right to receive any cash, securities or other property or in which the Common Stock (or such other security) is exchanged for or converted into any
combination of cash, securities or other property, the date fixed for determination of holders of the Common Stock (or such other security) entitled to receive such cash, securities or other property (whether such date is fixed by the Board of
Directors, by statute, by contract or otherwise). 
 “Redemption Date” shall have the meaning specified in
Section 16.02(a). 
 “Redemption Notice” shall have the meaning specified in Section 16.02(a). 

“Redemption Price” means, for any Notes to be redeemed pursuant to Section 16.01, 100% of the Capitalized Principal
Amount of such Notes, plus the Make-Whole Amount, plus any accrued interest that has not been paid or capitalized, if any, to, but excluding, the Redemption Date (unless the Redemption Date falls after a Regular Record Date but on or
prior to the immediately succeeding Interest Payment Date, in which case interest accrued to the Interest Payment Date will be paid in cash at the Cash Interest Rate to Holders of record of such Notes as of the close of business on such Regular
Record Date (notwithstanding any prior election (or deemed election) by the Company to pay such interest pursuant to the Capitalization Method), and the Redemption Price will be equal to 100% of the Capitalized Principal Amount of such Notes). 

“Reference Property” shall have the meaning specified in Section 14.06(a). 

“Regular Record Date,” with respect to any Interest Payment Date, means the June 15 or December 15 (whether or not
such day is a Business Day) immediately preceding the applicable June 30 or December 30 Interest Payment Date, respectively. 

“Responsible Officer” means, 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 Securities” shall have the meaning specified in Section 2.05(c). 

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

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

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

  
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 “Securities Act” means the Securities Act of 1933, as amended, and the
rules and regulations promulgated thereunder. 
 “Settlement Amount” shall have the meaning specified in
Section 14.02(a)(iv). 
 “Settlement Method” means, with respect to any conversion of Notes, Physical Settlement, Cash
Settlement or Combination Settlement, as elected (or deemed to have been elected) by the Company. 
 “Settlement Notice”
shall have the meaning specified in Section 14.02(a)(iii). 
 “Significant Subsidiary” means a Subsidiary of the
Company that meets the definition of “significant subsidiary” in Article 1, Rule 1-02 of Regulation S-X under the Exchange Act. 

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

“Spin-Off” shall have the meaning specified in Section 14.03(c). 

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

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

“Trading Day” means a day on which (i) trading in the Common Stock (or other security for which a closing sale price
must be determined) generally occurs on the New York Stock Exchange or, if the Common Stock (or such other security) is not then listed on the New York Stock Exchange, on the principal other U.S. national or regional securities exchange on which the
Common Stock (or such other security) is then listed or, if the Common Stock (or such other security) is not then listed on a U.S. national or regional securities exchange, on the principal other market on which the Common Stock (or such other
security) is then traded and (ii) a Last Reported Sale Price for the Common Stock (or closing sale price for such other security) is available on such securities exchange or market; provided that if the Common Stock (or such other
security) is not so listed or traded, “Trading Day” means a Business Day; and provided further that, for purposes of determining amounts due upon conversion only, “Trading Day” means a day on which
(x) there is no Market Disruption Event and (y) trading in the Common Stock generally occurs on the New York Stock Exchange or, if the Common Stock is not then listed on the New York Stock Exchange, on the principal other U.S. national or
regional securities exchange on which the Common Stock is then listed or, if the Common Stock is not then listed on a U.S. national or regional securities exchange, on the principal other market on which the Common Stock is then listed or admitted
for trading, except that if the Common Stock is not so listed or admitted for trading, “Trading Day” means a Business Day. 

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

“Treasury Rate” means, with respect to any Redemption Date, Fundamental Change Repurchase Date or Company Conversion Date,
the yield to maturity of United States Treasury securities with a constant maturity (as compiled and published in the most recent Federal Reserve Statistical Release H.15 (519) that has become publicly available at least two Business Days prior to
the date the Company settles its obligation in respect of such Redemption Date, Fundamental Change Repurchase Date or Company Conversion Date, as applicable, (or, if such Statistical Release is no longer published, any publicly available source of
similar market data)) most nearly equal to the period from such Redemption Date, Fundamental Change Repurchase Date or Company Conversion Date, as applicable, to February 18, 2027; provided that if the period from such Redemption
Date, Fundamental Change Repurchase Date or Company Conversion Date, as applicable, to February 18, 2027 is less than one year, the “Treasury Rate” shall be the weekly average yield on actually traded United States Treasury
securities adjusted to a constant maturity of one year. 
 “Trigger Event” shall have the meaning specified in
Section 14.03(c). 
 “Trust Indenture Act” means the Trust Indenture Act of 1939, as amended, as it was in force at
the date of execution of this Indenture; provided, however, that in the event the Trust Indenture Act of 1939 is amended after the date of this Indenture, the term “Trust Indenture Act” shall mean, to the extent required by
such amendment, the Trust Indenture Act of 1939, as so amended. 
 “Trustee” means the Person named as the
“Trustee” in the first paragraph of this Indenture until a successor trustee shall have become such pursuant to the applicable provisions of this Indenture, and thereafter “Trustee” shall mean or include each Person
who is then a Trustee hereunder. 
 “Unit of Reference Property” shall have the meaning specified in Section 14.06(a).
“Valuation Period” shall have the meaning specified in Section 14.03(c). 
 “Wholly Owned Subsidiary” means,
with respect to any Person, any Subsidiary of such Person, except that, solely for purposes of this definition, the reference to “more than 50%” in the definition of “Subsidiary” shall be deemed replaced by a reference to
“100%”, the calculation of which shall exclude nominal amounts of the voting power of shares of Capital Stock or other interests in the relevant Subsidiary not held by such person to the extent required to satisfy local minority interest
requirements outside of the United States. 
 Section 1.02.    References to Interest. Unless the context
otherwise requires, any reference to accrued interest on, or in respect of, any Note that has not been paid or capitalized in this Indenture shall be deemed to refer to the amount of such interest that would have accrued as of the relevant time at
the applicable Cash Interest Rate as if the Company had elected the Cash Method in respect of all of the relevant interest (whether or not the Company actually elected the Cash Method and notwithstanding any prior election (or deemed election) by
the Company to pay such interest pursuant to the Capitalization Method). 

  
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 Article 2.    Issue, Description, Execution, Registration and Exchange of
Notes 
 Section 2.01.    Designation and Amount. The Notes shall be designated as the “Convertible
Senior PIK Toggle Notes due 2027.” The aggregate Initial Principal Amount of Notes that may be authenticated and delivered under this Indenture is initially limited to $100,000,000, subject to Section 2.10 and except for Notes
authenticated and delivered upon the issuance of PIK Notes or registration or transfer of, or in exchange for, or in lieu of other Notes to the extent expressly permitted hereunder. 

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

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

Any of the Notes may have such letters, numbers or other marks of identification and such notations, legends or endorsements as the Officer
executing the same may approve (execution thereof to be conclusive evidence of such approval) and as are not inconsistent with the provisions of this Indenture, or as may be required to comply with any law or with any rule or regulation made
pursuant thereto or with any rule or regulation of any securities exchange or automated quotation system on which the Notes may be listed or designated for issuance, or to conform to usage or to indicate any special limitations or restrictions to
which any particular Notes are subject. 
 Each Global Note shall represent such principal amount of the outstanding Notes as shall be
specified therein and shall provide that it shall represent the aggregate principal amount of outstanding Notes from time to time endorsed thereon and that the aggregate principal amount of outstanding Notes represented thereby may from time to time
be increased or reduced to reflect PIK Interest, redemptions, repurchases, cancellations, conversions, transfers or exchanges permitted hereby. Any endorsement of a Global Note to reflect the amount of any increase or decrease in the amount of
outstanding Notes represented thereby shall be made by the Trustee or the Custodian, at the direction of the Trustee, in such manner and upon instructions given by the Holder of such Notes in accordance with this Indenture. Payment of principal
(including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, and accrued interest on, a Global Note shall be made to the Holder of such Note on the date of payment, unless a record date or other means of
determining Holders eligible to receive payment is provided for herein. 

  
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 Section 2.03.    Date and Denomination of Notes; Payments of
Interest and Defaulted Amounts. 
 a.    The Notes shall be issuable in registered form without coupons in
denominations of $1.00 principal amount and integral multiples thereof. PIK Interest on the Notes shall be paid in denominations of $1.00 and integral multiples thereof. Each Note shall be dated the date of its authentication and shall bear interest
from the date specified on the face of such Note. Accrued interest on the Notes shall be computed on the basis of a 360-day year composed of twelve 30-day months and,
for partial months, on the basis of the number of days actually elapsed in a 30-day month. 

b.    The Person in whose name any Note (or its Predecessor Note) is registered on the Note Register at the close of
business on any Regular Record Date with respect to any Interest Payment Date shall be entitled to receive the interest payable on such Interest Payment Date. The Capitalized Principal Amount of any Note (x) in the case of any Physical Note,
shall be payable at the office or agency of the Company maintained by the Company for such purposes in the continental United States of America, which shall initially be the Corporate Trust Office, or by check mailed to the Holders of these Notes at
their address as it appears in the Note Register or such other means as agreed between the Company and such Holder, and (y) in the case of any Global Note, shall be payable by wire transfer of immediately available funds to the account of the
Depositary or its nominee. The Company shall pay, or cause the Paying Agent to pay, cash interest when due (i) on any Physical Notes (A) to Holders holding Physical Notes having an aggregate principal amount of $5,000,000 or less, by check
mailed to the Holders of these Notes at their address as it appears in the Note Register and (B) to Holders holding Physical Notes having an aggregate principal amount of more than $5,000,000 (or such other amount as the Company shall determine
in its discretion), either by check mailed to each Holder or, upon application by such a Holder to the Note Registrar not later than the relevant Regular Record Date, by wire transfer in immediately available funds to that Holder’s account
within the United States if such Holder has provided the Company, the Trustee or the Paying Agent (if other than the Trustee) with the requisite information necessary to make such wire transfer prior to the relevant Regular Record Date, which
application shall remain in effect until the Holder notifies, in writing, the Note Registrar to the contrary or (ii) on any Global Note by wire transfer of immediately available funds to the account of the Depositary or its nominee. 

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

i.    The Company may elect to make payment of any Defaulted Amounts to the Persons in whose names the
Notes (or their respective Predecessor Notes) are registered at the close of business on a special record date for the payment of such Defaulted Amounts, which shall be fixed in the following manner. The Company shall notify the Trustee in writing
of the amount of the Defaulted Amounts proposed to be paid on each Note and the date of the proposed payment (which shall be not less than 25 days after the receipt by the Trustee of such notice, unless the Trustee shall consent to an


  
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earlier date), and at the same time the Company shall deposit with the Trustee an amount of money equal to the aggregate amount to be paid in respect of such Defaulted Amounts or shall make
arrangements satisfactory to the Trustee for such deposit on or prior to the date of the proposed payment, such money when deposited to be held in trust for the benefit of the Persons entitled to such Defaulted Amounts as in this clause provided.
Thereupon the Company shall fix a special record date for the payment of such Defaulted Amounts which shall be not more than 15 days and not less than 10 days prior to the date of the proposed payment, and not less than 10 days after the receipt by
the Trustee of the notice of the proposed payment. The Company shall promptly notify the Trustee of such special record date and the Trustee, in the name and at the expense of the Company, shall cause notice of the proposed payment of such Defaulted
Amounts and the special record date therefor to be delivered to each Holder not less than 10 days prior to such special record date. Notice of the proposed payment of such Defaulted Amounts and the special record date therefor having been so
delivered, such Defaulted Amounts shall be paid to the Persons in whose names the Notes (or their respective Predecessor Notes) are registered at the close of business on such special record date and shall no longer be payable pursuant to the
following clause (ii) of this Section 2.03(c). 
 ii.    The Company may make payment of any
Defaulted Amounts in any other lawful manner not inconsistent with the requirements of any securities exchange or automated quotation system on which the Notes may be listed or designated for issuance, and upon such notice as may be required by such
exchange or automated quotation system, if, after notice given by the Company to the Trustee of the proposed payment pursuant to this clause, such manner of payment shall be deemed practicable by the Trustee. 

d.     

i.    The Company may, at its option, elect to pay interest on the Notes on any Interest Payment Date
(i) by paying an amount in cash on such Interest Payment Date equal to all or a portion of interest accrued from, and including, the immediately preceding Interest Payment Date (or if there is no immediately preceding Interest Payment Date,
from, and including, the Issue Date) on the Capitalized Principal Amount as of the immediately preceding Interest Payment Date (or if there is no immediately preceding Interest Payment Date, on the Initial Principal Amount), calculated at the Cash
Interest Rate (the “Cash Method”) and (ii) to the extent not paid by the Cash Method, by increasing the Capitalized Principal Amount of the Notes by the Capitalization Amount for such Interest Payment Date automatically and
without any action by any Person (the “Capitalization Method”); provided that on any Interest Payment Date on which the Company pays interest using the Capitalization Method, the Capitalized Principal Amount shall be rounded
up to the nearest $1.00; and provided further that for any Notes (1) surrendered for conversion after a Regular Record Date and on or prior to the corresponding Interest Payment Date; (2) redeemed in connection with a
Redemption Date that is after a Regular Record Date and on or prior to the corresponding Interest Payment Date; (3) converted at the option of the Company after a Regular Record Date and on or prior to the corresponding Interest Payment Date;
or (4) repurchased on a Fundamental Change Repurchase Date that is after a Regular Record Date and on or prior 

  
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to the corresponding Interest Payment Date, any Capitalization Amount by which the Capitalized Principal Amount for such Notes would have been increased on such corresponding Interest Payment
Date shall instead be paid in cash at the Cash Interest Rate to the relevant Holder(s) of such Notes as of such Regular Record Date, and no such increase shall be made to the Capitalized Principal Amount of such Notes (notwithstanding any prior
election (or deemed election) by the Company to pay such interest pursuant to the Capitalization Method for such Notes). The Company shall elect the method of paying interest on an Interest Payment Date by delivering a notice to the Trustee on or
prior to the 10th calendar day immediately preceding the relevant Interest Payment Date identifying the method selected and (a) the amount of cash interest to be paid and/or (b) the
Capitalization Amount and new Capitalized Principal Amount, as applicable. In the absence of such an election with respect to an Interest Payment Date, the Company shall be deemed to have elected the Capitalization Method. All interest payable in
respect of the Interest Payment Date scheduled to occur on the Maturity Date shall be paid entirely by the Cash Method. 

ii.    Notwithstanding the foregoing or anything to the contrary in this Indenture, if the Notes are
represented by one or more Physical Notes, the Company may, at its option, in lieu of the Capitalization Method, pay interest due and payable on such Physical Notes by issuing additional Physical Notes to the relevant record Holder on the relevant
Interest Payment Date (the “PIK Notes”) in an aggregate principal amount equal to the relevant Capitalization Amount (rounded up to the nearest $1.00). The issuance of any PIK Notes shall be computed on the basis of the aggregate
principal amount of the Notes held by a Holder. Following an increase in the principal amount of the outstanding Global Notes as a result of a PIK Payment, the Global Notes shall bear interest on such increased principal amount from and after the
date of such PIK Payment. Any PIK Notes issued as Physical Notes shall be dated as of the applicable Interest Payment Date and shall bear interest from and after such date. All PIK Notes issued pursuant to a PIK Payment shall be governed by, and
subject to the terms, provisions and conditions of, this Indenture and shall have the same rights and benefits as the Notes issued on the Issue Date. Any PIK Notes shall be issued with the description PIK on the face of such Note, and references to
the “principal amount” of the Notes shall include any increase in the principal amount of the outstanding Notes as a result of any PIK Payment. The Notes issued on the Issue Date and any PIK Notes shall be treated as a single class for all
purposes under this Indenture. 
 Section 2.04.    Execution, Authentication and Delivery of Notes. The
Notes shall be signed in the name and on behalf of the Company by the manual, electronic or facsimile signature of its Chief Executive Officer, President, Chief Financial Officer, Treasurer, Secretary or any of its Executive or Senior Vice
Presidents. 
 At any time and from time to time after the execution and delivery of this Indenture, the Company may deliver Notes executed
by the Company to the Trustee for authentication, together with a Company Order for the authentication and delivery of such Notes, and the Trustee in accordance with such Company Order shall authenticate and deliver such Notes, without any further
action by the Company hereunder. 

  
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 Only such Notes as shall bear thereon a certificate of authentication substantially in the
form set forth on the Form of Note attached as Exhibit A hereto, executed manually, electronically or by facsimile by an authorized officer of the Trustee (or an authenticating agent appointed by the Trustee as provided by Section 17.10), shall
be entitled to the benefits of this Indenture or be valid or obligatory for any purpose. Such certificate by the Trustee (or such an authenticating agent) upon any Note executed by the Company shall be conclusive evidence that the Note so
authenticated has been duly authenticated and delivered hereunder and that the Holder is entitled to the benefits of this Indenture. 
 In
case any Officer of the Company who shall have signed any of the Notes shall cease to be such Officer before the Notes so signed shall have been authenticated and delivered by the Trustee, or disposed of by the Company, such Notes nevertheless may
be authenticated and delivered or disposed of as though the person who signed such Notes had not ceased to be such Officer of the Company; and any Note may be signed on behalf of the Company by such persons as, at the actual date of the execution of
such Note, shall be the Officers of the Company, although at the date of the execution of this Indenture any such person was not such an Officer. 

Section 2.05.    Exchange and Registration of Transfer of Notes; Restrictions on Transfer; Depositary. 

a.    The Company shall cause to be kept at the Corporate Trust Office a register (the register maintained in such office
or in any other office or agency of the Company designated pursuant to Section 4.02, the “Note Register”) in which, subject to such reasonable regulations as it may prescribe, the Company shall provide for the registration of
Notes and of transfers of Notes. Such register shall be in written form or in any form capable of being converted into written form within a reasonable period of time. The Trustee is hereby initially appointed the “Note Registrar”
for the purpose of registering Notes and transfers of Notes as herein provided. The Company may appoint one or more co-Note Registrars in accordance with Section 4.02. 

Upon surrender for registration of transfer of any Note to the Note Registrar or any co-Note
Registrar, and satisfaction of the requirements for such transfer set forth in this Section 2.05, the Company shall execute, and the Trustee shall authenticate and deliver, in the name of the designated transferee or transferees, one or more
new Notes of any authorized denominations and of a like aggregate principal amount and bearing such restrictive legends as may be required by this Indenture. 

Notes may be exchanged for other Notes of any authorized denominations and of a like aggregate principal amount, upon surrender of the Notes
to be exchanged at any such office or agency maintained by the Company pursuant to Section 4.02. Whenever any Notes are so surrendered for exchange, the Company shall execute, and the Trustee shall authenticate and deliver, the Notes that the
Holder making the exchange is entitled to receive, bearing registration numbers not contemporaneously outstanding. 
 All Notes presented or
surrendered for registration of transfer or for exchange, repurchase or conversion shall (if so required by the Company, the Trustee, the Note Registrar or any co-Note Registrar) be duly endorsed, or be
accompanied by a written instrument or instruments of transfer in form satisfactory to the Company and duly executed, by the Holder thereof or its attorney-in-fact duly
authorized in writing. 

  
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 No service charge shall be imposed by the Company, the Trustee, the Note Registrar, any co-Note Registrar or the Paying Agent for any exchange or registration of transfer of Notes, but the Company may require a Holder to pay a sum sufficient to cover any documentary, stamp or similar issue or transfer
tax required in connection therewith as a result of the name of the Holder of new Notes issued upon such exchange or registration of transfer being different from the name of the Holder of the old Notes surrendered for exchange or registration of
transfer. 
 None of the Company, the Trustee, the Note Registrar or any co-Note Registrar shall be
required to exchange or register a transfer of (i) any Notes surrendered for conversion by a Holder or, if a portion of any Note is surrendered for conversion by a Holder, such portion thereof surrendered for conversion, (ii) any Notes, or
a portion of any Note, surrendered for repurchase (and not withdrawn) in accordance with Article 15, (iii) any Notes selected for conversion by the Company or, if a portion of any Note is selected for conversion by the Company, such portion thereof
selected for conversion, or (iv) any Notes selected for redemption in accordance with Article 16, except the unredeemed portion of any Note being redeemed in part. 

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

b.    The Notes shall be issued initially in the form of Physical Notes. At the Company’s sole discretion, so long as
the Notes are eligible for book-entry settlement with the Depositary and the restrictions on transfer described in Section 2.05(c) no longer apply to such Note, subject to the fourth paragraph from the end of Section 2.05(c) the Notes may
be represented by one or more Notes in global form (each, a “Global Note”) registered in the name of the Depositary or the nominee of the Depositary. The transfer and exchange of beneficial interests in a Global Note that does not
involve the issuance of a Physical Note shall be effected through the Depositary (but not the Trustee or the Custodian) in accordance with this Indenture (including the restrictions on transfer set forth herein) and the procedures of the Depositary
therefor. 
 c.    Every Note shall bear the legend set forth in this Section 2.05(c) (together with any Common
Stock issued upon conversion of the Notes that is required to bear the legend set forth in Section 2.05(d), collectively, the “Restricted Securities”) and shall be subject to the restrictions on transfer set forth in this
Section 2.05(c) (including the legend set forth below), unless such restrictions on transfer shall be eliminated or otherwise waived by written consent of the Company, and the Holder of each such Restricted Security, by such Holder’s
acceptance thereof, agrees to be bound by all such restrictions on transfer. As used in this Section 2.05(c) and Section 2.05(d), the term “transfer” encompasses any sale, pledge, transfer or other disposition whatsoever of any
Restricted Security. 

  
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 Any certificate evidencing a Note (and all securities issued in exchange therefor or
substitution thereof, other than Common Stock, if any, issued upon conversion thereof, which shall bear the legend set forth in Section 2.05(d), if applicable) shall bear a legend in substantially the following form (unless otherwise agreed by
the Company in writing, with notice thereof to the Trustee): 
 THIS SECURITY AND THE COMMON STOCK, IF ANY, ISSUABLE UPON CONVERSION OF THIS
SECURITY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED EXCEPT IN ACCORDANCE WITH THE FOLLOWING SENTENCE. BY ITS
ACQUISITION HEREOF OR OF A BENEFICIAL INTEREST HEREIN, THE ACQUIRER AGREES FOR THE BENEFIT OF ASPEN AEROGELS, INC. (THE “COMPANY”) THAT IT WILL NOT OFFER, SELL, PLEDGE OR OTHERWISE TRANSFER THIS SECURITY OR ANY BENEFICIAL INTEREST
HEREIN EXCEPT: 
 (A)    TO THE COMPANY OR ANY SUBSIDIARY THEREOF, OR 

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

(C)    PURSUANT TO AN EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT OR ANY
OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. 
 PRIOR TO THE REGISTRATION OF ANY TRANSFER IN
ACCORDANCE WITH CLAUSE (C) 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. 

THIS SECURITY IS SUBJECT TO RESTRICTIONS ON TRANSFER AS SET FORTH IN A NOTE PURCHASE AGREEMENT DATED AS OF FEBRUARY 15, 2022 (AS IT MAY
BE AMENDED FROM TIME TO TIME), BY AND AMONG THE COMPANY AND CERTAIN OTHER PARTIES THERETO, COPIES OF WHICH ARE PUBLICLY FILED OR ON FILE WITH THE SECRETARY OF THE COMPANY, AND THIS SECURITY MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED
EXCEPT IN COMPLIANCE THEREWITH. 
 No transfer of any Note will be registered by the Note Registrar unless the applicable box on the Form of
Assignment and Transfer has been checked. 
 Notwithstanding any other provisions of this Indenture (other than the provisions set forth in
this Section 2.05(c)), a Global Note may not be transferred as a whole or in part except (i) by 

  
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the Depositary to a nominee of the Depositary or by a nominee of the Depositary to the Depositary or another nominee of the Depositary or by the Depositary or any such nominee to a successor
Depositary or a nominee of such successor Depositary and (ii) for exchange of a Global Note or a portion thereof for one or more Physical Notes in accordance with the second immediately succeeding paragraph. 

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

Physical Notes issued in exchange for all or a part of the Global Note pursuant to this Section 2.05(c) shall be registered in such names
and in such authorized denominations as the Depositary, pursuant to instructions from its direct or indirect participants or otherwise, or, in the case of clause (iii) of the immediately preceding paragraph, the relevant beneficial owner, shall
instruct the Trustee. Upon execution and authentication, the Trustee shall deliver such Physical Notes to the Persons in whose names such Physical Notes are so registered. 

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

  
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 None of the Company, the Trustee or any agent of the Company or the Trustee shall have any
responsibility or liability for any aspect of the records relating to or payments made on account of beneficial ownership interests of a Global Note or maintaining, supervising or reviewing any records relating to such beneficial ownership
interests. 
 d.    Any stock certificate or book-entry representing Common Stock issued upon conversion of a Note shall
bear a legend in substantially the following form (unless such Common Stock has been transferred pursuant to a registration statement that has become or been declared effective under the Securities Act and that continues to be effective at the time
of such transfer, or pursuant to the exemption from registration provided by Rule 144 or any similar provision then in force under the Securities Act, or such Common Stock has been issued upon conversion of a Note that has transferred pursuant to a
registration statement that has become or been declared effective under the Securities Act and that continues to be effective at the time of such transfer, or pursuant to the exemption from registration provided by Rule 144 or any similar provision
then in force under the Securities Act, or unless otherwise agreed by the Company with written notice thereof to the Trustee and any transfer agent for the Common Stock): 

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND MAY NOT BE
OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED EXCEPT IN ACCORDANCE WITH THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF OR OF A BENEFICIAL INTEREST HEREIN, THE ACQUIRER AGREES FOR THE BENEFIT OF ASPEN AEROGELS, INC. (THE “COMPANY”)
THAT IT WILL NOT OFFER, SELL, PLEDGE OR OTHERWISE TRANSFER THIS SECURITY OR ANY BENEFICIAL INTEREST HEREIN EXCEPT: 

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

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

(C)    PURSUANT TO AN EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT OR ANY
OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. 
 PRIOR TO THE REGISTRATION OF ANY TRANSFER IN
ACCORDANCE WITH CLAUSE (C) ABOVE, THE COMPANY AND THE TRANSFER AGENT FOR THE COMPANY’S COMMON STOCK RESERVE THE RIGHT TO REQUIRE THE DELIVERY OF SUCH LEGAL OPINIONS, CERTIFICATIONS OR OTHER EVIDENCE AS MAY REASONABLY BE REQUIRED IN ORDER
TO DETERMINE THAT THE PROPOSED TRANSFER IS BEING MADE IN COMPLIANCE WITH THE SECURITIES ACT AND APPLICABLE STATE SECURITIES LAWS. NO REPRESENTATION IS MADE AS TO THE AVAILABILITY OF ANY EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES
ACT. 

  
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 THIS SECURITY IS SUBJECT TO RESTRICTIONS ON TRANSFER AS SET FORTH IN A NOTE PURCHASE
AGREEMENT DATED AS OF FEBRUARY 15, 2022 (AS IT MAY BE AMENDED FROM TIME TO TIME), BY AND AMONG THE COMPANY AND CERTAIN OTHER PARTIES THERETO, COPIES OF WHICH ARE PUBLICLY FILED OR ON FILE WITH THE SECRETARY OF THE COMPANY, AND THIS SECURITY MAY
NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED EXCEPT IN COMPLIANCE THEREWITH. 
 Any such Common Stock (i) as to which such
restrictions on transfer shall have expired in accordance with their terms, (ii) that has been transferred pursuant to a registration statement that has become or been declared effective under the Securities Act and that continues to be
effective at the time of such transfer or (iii) that has been sold pursuant to the exemption from registration provided by Rule 144 or any similar provision then in force under the Securities Act, may, upon surrender of the certificates
representing such shares of Common Stock for exchange in accordance with the procedures of the transfer agent for the Common Stock, be exchanged for a new certificate or certificates for a like aggregate number of shares of Common Stock, which shall
not bear the restrictive legend required by this Section 2.05(d). 
 Section 2.06.    Mutilated, Destroyed,
Lost or Stolen Notes. In case any Note shall become mutilated or be destroyed, lost or stolen, the Company in its discretion may execute, and upon its written request the Trustee or an authenticating agent appointed by the Trustee shall
authenticate and deliver, a new Note, bearing a registration number not contemporaneously outstanding, in exchange and substitution for the mutilated Note, or in lieu of and in substitution for the Note so destroyed, lost or stolen. In every case
the applicant for a substituted Note shall furnish to the Company, to the Trustee and, if applicable, to such authenticating agent such security or indemnity as may be required by them to save each of them harmless from any loss, liability, cost or
expense caused by or connected with such substitution, and, in every case of destruction, loss or theft, the applicant shall also furnish to the Company, to the Trustee and, if applicable, to such authenticating agent evidence to their satisfaction
of the destruction, loss or theft of such Note and of the ownership thereof. 
 The Trustee or such authenticating agent may authenticate
any such substituted Note and deliver the same upon the receipt of such security or indemnity as the Trustee, the Company and, if applicable, such authenticating agent may require. No service charge shall be imposed by the Company, the Trustee, the
Note Registrar, any co-Note Registrar or the Paying Agent upon the issuance of any substitute Note, but the Company may require a Holder to pay a sum sufficient to cover any documentary, stamp or similar issue
or transfer tax required in connection therewith as a result of the name of the Holder of the new substitute Note being different from the name of the Holder of the old Note that became mutilated or was destroyed, lost or stolen. In case any Note
that has matured or is about to mature or has been surrendered for required repurchase or is about to be converted in accordance with Article 14 shall become mutilated or be destroyed, lost or stolen, the Company may, in its sole discretion, instead
of issuing a substitute Note, pay or authorize the payment of or convert or authorize the conversion of the same (without surrender thereof except in the case of a mutilated Note), as the case may be, if the applicant for such payment or conversion
shall furnish to the Company, to the Trustee and, if applicable, to such authenticating agent such security or indemnity as may be required by them to save each of them harmless for any loss, liability, cost or expense caused by or connected with
such substitution, 

  
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and, in every case of destruction, loss or theft, evidence satisfactory to the Company, the Trustee and, if applicable, any Paying Agent or Conversion Agent evidence of their satisfaction of the
destruction, loss or theft of such Note and of the ownership thereof. 
 Every substitute Note issued pursuant to the provisions of this
Section 2.06 by virtue of the fact that any Note is destroyed, lost or stolen shall constitute an additional contractual obligation of the Company, whether or not the destroyed, lost or stolen Note shall be found at any time, and shall be
entitled to all the benefits of (but shall be subject to all the limitations set forth in) this Indenture equally and proportionately with any and all other Notes duly issued hereunder. To the extent permitted by law, all Notes shall be held and
owned upon the express condition that the foregoing provisions are exclusive with respect to the replacement, payment, redemption, conversion or repurchase of mutilated, destroyed, lost or stolen Notes and shall preclude any and all other rights or
remedies notwithstanding any law or statute existing or hereafter enacted to the contrary with respect to the replacement, payment, redemption, conversion or repurchase of negotiable instruments or other securities without their surrender. 

Section 2.07.    Temporary Notes. Pending the preparation of Physical Notes, the Company may execute and the
Trustee or an authenticating agent appointed by the Trustee shall, upon written request of the Company, authenticate and deliver temporary Notes in registered form (printed or lithographed). Temporary Notes shall be issuable in any authorized
denomination, and substantially in the form of the Physical Notes but with such omissions, insertions and variations as may be appropriate for temporary Notes, all as may be determined by the Company. Every such temporary Note shall be executed by
the Company and authenticated by the Trustee or such authenticating agent upon the same conditions and in substantially the same manner, and with the same effect, as the Physical Notes. Without unreasonable delay, the Company shall execute and
deliver to the Trustee or such authenticating agent Physical Notes (other than any Global Note) and thereupon any or all temporary Notes (other than any Global Note) may be surrendered in exchange therefor, at each office or agency maintained by the
Company pursuant to Section 4.02 and the Trustee or such authenticating agent shall authenticate and deliver in exchange for such temporary Notes an equal aggregate principal amount of Physical Notes. Such exchange shall be made by the Company
at its own expense and without any charge therefor. Until so exchanged, the temporary Notes shall in all respects be entitled to the same benefits and subject to the same limitations under this Indenture as Physical Notes authenticated and delivered
hereunder. 
 Section 2.08.    Cancellation of Notes Paid, Converted, Etc. The Company shall cause all Notes
surrendered for the purpose of payment at maturity, repurchase upon a Fundamental Change, redemption, registration of transfer or exchange or conversion (other than any Notes exchanged pursuant to Section 14.11), if surrendered to the Company
or any of the Company’s agents, Subsidiaries or Affiliates that the Company controls, to be surrendered to the Trustee for cancellation. All Notes delivered to the Trustee shall be canceled promptly by it. Except for any Notes surrendered for
registration of transfer or exchange, or as otherwise expressly permitted by any of the provisions of this Indenture, no Notes shall be authenticated in exchange for any Notes surrendered to the Trustee for cancellation. The Trustee shall dispose of
canceled Notes in accordance with its customary procedures and, after such disposition, shall deliver a certificate of such disposition to the Company, at the Company’s written request in a Company Order. 

  
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 Section 2.09.    CUSIP Numbers. The Company in issuing the
Notes may use “CUSIP” numbers (if then generally in use), and, if so, the Trustee shall use “CUSIP” numbers in all notices issued to Holders as a convenience to such Holders; provided that any such notice may state that no
representation is made as to the correctness of such numbers either as printed on the Notes or on such notice and that reliance may be placed only on the other identification numbers printed on the Notes. The Company shall promptly notify the
Trustee in writing of any change in the “CUSIP” numbers. 
 Section 2.10.    Additional Notes;
Repurchases. The Company may, without the consent of the Holders and notwithstanding Section 2.01, reopen this Indenture and issue additional Notes hereunder (in addition to any PIK Notes) with the same terms as the Notes initially issued
hereunder (other than differences in the issue date, the issue price and interest accrued prior to the issue date of such additional Notes) in an unlimited aggregate principal amount; provided that if any such additional Notes are not
fungible with the Notes initially issued hereunder for U.S. federal income tax purposes, such additional Notes shall have a separate CUSIP number (if any). Prior to the issuance of any such additional Notes, the Company shall deliver to the Trustee
a Company Order, an Officer’s Certificate and an Opinion of Counsel, such Officer’s Certificate and Opinion of Counsel to cover such matters, in addition to those required by Section 17.05, as the Trustee shall reasonably request. In
addition, the Company may, to the extent permitted by law, and directly or indirectly (regardless of whether such Notes are surrendered to the Company), repurchase Notes in the open market or otherwise, whether by the Company or its Subsidiaries or
through a private or public tender or exchange offer or through counterparties to private agreements, including by cash-settled swaps or other derivatives. The Company shall cause any Notes so repurchased (other than Notes repurchased pursuant to
cash-settled swaps or other derivatives) to be surrendered to the Trustee for cancellation in accordance with Section 2.08 and such Notes shall no longer be considered outstanding under this Indenture upon their repurchase. 

Article 3.    Satisfaction and Discharge 

Section 3.01.    Satisfaction and Discharge. This Indenture shall upon request of the Company contained in an
Officer’s Certificate cease to be of further effect, and the Trustee, at the expense of the Company, shall execute proper instruments acknowledging satisfaction and discharge of this Indenture, when (i) all Notes theretofore authenticated
and delivered (other than Notes which have been destroyed, lost or stolen and which have been replaced, paid or converted as provided in Section 2.06) have been delivered to the Trustee for cancellation; or (ii) the Company has deposited
with the Trustee or delivered to Holders, as applicable, after the Notes have become due and payable, whether on the Maturity Date, any Redemption Date, any Fundamental Change Repurchase Date, upon conversion or otherwise, cash or cash, shares of
Common Stock or a combination thereof, as applicable, solely to satisfy the Company’s Conversion Obligation or the Company’s Conversion Right, sufficient to pay all of the outstanding Notes and all other sums due and payable under this
Indenture by the Company; and the Company has delivered to the Trustee an Officer’s Certificate and an Opinion of Counsel, each stating that all conditions precedent herein provided for relating to the satisfaction and discharge of this
Indenture have been complied with. Notwithstanding the satisfaction and discharge of this Indenture, the obligations of the Company to the Trustee under Section 7.06 shall survive. 

  
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 Article 4.    Particular Covenants of the Company 

Section 4.01.    Payment of Principal and Interest. The Company covenants and agrees that it will cause to be
paid the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, and pay or capitalize, as the case may be, accrued interest that has not been paid or capitalized on, each of the Notes at the places,
at the respective times and in the manner provided herein and in the Notes. 
 Section 4.02.    Maintenance of
Office or Agency. The Company will maintain in the continental United States of America an office or agency where the Notes may be surrendered for registration of transfer or exchange or for presentation for payment or repurchase
(“Paying Agent”) or for conversion (“Conversion Agent”) and where notices and demands to or upon the Company in respect of the Notes and this Indenture may be served. The Company will give prompt written notice to
the Trustee 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 or the office or agency of the Trustee in the continental United States of America. 

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

The Company hereby initially designates the Trustee as the Paying Agent, Note Registrar, Custodian and Conversion Agent and the Corporate
Trust Office as the office or agency in the continental United States of America where Notes may be surrendered for registration of transfer or exchange or for presentation for payment or repurchase or for conversion and where notices and demands to
or upon the Company in respect of the Notes and this Indenture may be served. 
 Section 4.03.    Appointments
to Fill Vacancies in Trustee’s Office. The Company, whenever necessary to avoid or fill a vacancy in the office of Trustee, will appoint, in the manner provided in Section 7.09, a Trustee, so that there shall at all times
be a Trustee hereunder. 
 Section 4.04.    Provisions as to Paying Agent. 

a.    If the Company shall appoint a Paying Agent other than the Trustee, the Company will cause such Paying Agent to
execute and deliver to the Trustee an instrument in which such agent shall agree with the Trustee, subject to the provisions of this Section 4.04: 

i.    that it will hold all sums held by it as such agent for the payment of the principal (including the
Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, and accrued and unpaid interest on, the Notes in trust for the benefit of the Holders of the Notes; 

  
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 ii.    that it will give the Trustee prompt notice of
any failure by the Company to make any payment of the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, and accrued and unpaid interest on, the Notes when the same shall be due and payable; and

 iii.    that at any time during the continuance of an Event of Default, upon request of the Trustee,
it will forthwith pay to the Trustee all sums so held in trust. 
 Subject to Section 2.03(d), the Company shall, on or before each due
date of the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, or accrued and unpaid interest on, the Notes, deposit with the Paying Agent a sum sufficient to pay such principal (including the
Redemption Price and the Fundamental Change Repurchase Price, if applicable) or accrued and unpaid interest, and (unless such Paying Agent is the Trustee) the Company will promptly notify the Trustee of any failure to take such action;
provided that if such deposit is made on the due date, such deposit must be received by the Paying Agent by 11:00 a.m., New York City time, on such date. 

b.    If the Company shall act as its own Paying Agent, subject to Section 2.03(d), it will, on or before each due
date of the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, and accrued and unpaid interest on, the Notes, set aside, segregate and hold in trust for the benefit of the Holders of the Notes a
sum sufficient to pay such principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) and accrued and unpaid interest so becoming due and will promptly notify the Trustee in writing of any failure to take
such action and of any failure by the Company to make any payment of the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, or accrued and unpaid interest on, the Notes when the same shall
become due and payable. 
 c.    Anything in this Section 4.04 to the contrary notwithstanding, the Company may, at
any time, for the purpose of obtaining a satisfaction and discharge of this Indenture, or for any other reason, pay, cause to be paid or deliver to the Trustee all sums or amounts held in trust by the Company or any Paying Agent hereunder as
required by this Section 4.04, such sums or amounts to be held by the Trustee upon the trusts herein contained and upon such payment or delivery by the Company or any Paying Agent to the Trustee, the Company or such Paying Agent shall be
released from all further liability but only with respect to such sums or amounts. 
 d.    Any money and shares of
Common Stock deposited with the Trustee or any Paying Agent, or then held by the Company, in trust for the payment of the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, accrued and unpaid
interest on and the consideration due upon conversion of any Note and remaining unclaimed for one year after such principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable), interest or consideration due
upon conversion has become due and payable shall be paid to the Company on request of the Company contained in an Officer’s Certificate, or (if then held by the Company) shall be 

  
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discharged from such trust; and the Holder of such Note shall thereafter, as an unsecured general creditor, look only to the Company for payment thereof, and all liability of the Trustee or such
Paying Agent with respect to such trust money and shares of Common Stock, and all liability of the Company as trustee thereof, shall thereupon cease. 

Section 4.05.    Rule 144A Information Requirement and Annual Reports. At any time the Company is not subject
to Section 13 or 15(d) of the Exchange Act, the Company shall, so long as any of the Notes or any shares of Common Stock issuable upon conversion thereof shall, at such time, constitute “restricted securities” within the meaning of
Rule 144(a)(3) under the Securities Act, promptly provide to the Trustee and, upon written request, any Holder, beneficial owner or prospective purchaser of such Notes or any shares of Common Stock issuable upon conversion of such Notes, the
information required to be delivered pursuant to Rule 144A(d)(4) under the Securities Act to facilitate the resale of such Notes or shares of Common Stock pursuant to Rule 144A. 

Section 4.06.    Reports. The Company shall file with the Trustee, within 15 days after the same are required
to be filed with the Commission (giving effect to any grace period provided by Rule 12b-25 (or any successor rule) under the Exchange Act), copies of any documents or reports that the Company is required to
file with the Commission pursuant to Section 13 or 15(d) of the Exchange Act (excluding any such information, documents or reports, or portions thereof, subject to confidential treatment and any correspondence with the Commission). Any such
document or report that the Company files with the Commission via the Commission’s EDGAR system (or any successor thereto) shall be deemed to be filed with the Trustee for purposes of this Section 4.06 at the time such documents are filed
via the EDGAR system (or any successor thereto), it being understood that the Trustee shall not be responsible for determining whether such filings have been made. Delivery of the reports and documents described in this Section 4.06 to the
Trustee is for informational purposes only, and the Trustee’s receipt of such shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including the Company’s
compliance with any of its covenants hereunder (as to which the Trustee is entitled to conclusively rely on an Officer’s Certificate). 

Section 4.07.    Stay, Extension and Usury Laws. The Company covenants (to the extent that it may lawfully do
so) that it shall not at any time insist upon, plead, or in any manner whatsoever claim or take the benefit or advantage of, any stay, extension or usury law or other law that would prohibit or forgive the Company from paying all or any portion of
the principal of or interest on the Notes as contemplated herein, wherever enacted, now or at any time hereafter in force, or that may affect the covenants or the performance of this Indenture; and the Company (to the extent it may lawfully do so)
hereby expressly waives all benefit or advantage of any such law, and covenants that it will not, by resort to any such law, hinder, delay or impede the execution of any power herein granted to the Trustee, but will suffer and permit the execution
of every such power as though no such law had been enacted. 
 Section 4.08.    Compliance Certificate;
Statements as to Defaults. The Company shall deliver to the Trustee within 150 days after the end of each fiscal year of the Company (beginning with the fiscal year ending on December 31, 2022) an Officer’s Certificate stating whether
the signers thereof have knowledge of any Event of Default that occurred during the previous year and, if so, specifying each such Event of Default and the nature thereof. 

  
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 In addition, the Company shall deliver to the Trustee, within 30 days after the Company
obtains knowledge of the occurrence of any Event of Default or Default, an Officer’s Certificate setting forth the details of such Event of Default or Default, its status and the action that the Company is taking or proposing to take in respect
thereof; provided that the Company is not required to deliver such notice if such Event of Default or Default has been cured or is no longer continuing. 

Article 5.    Lists of Holders and Reports by the Company and the Trustee 

Section 5.01.    Lists of Holders. The Company covenants and agrees that, upon written request, it will
furnish or cause to be furnished to the Trustee, semi-annually, not more than 15 days after each June 15 and December 15 in each year, and at such other times as the Trustee may request in writing, within 30 days after receipt by the
Company of any such request (or such lesser time as the Trustee may reasonably request in order to enable it to timely provide any notice to be provided by it hereunder), a list in such form as the Trustee may reasonably require of the names and
addresses of the Holders as of a date not more than 15 days (or such other date as the Trustee may reasonably request in order to so provide any such notices) prior to the time such information is furnished, except that no such list need be
furnished so long as the Trustee is acting as Note Registrar. 
 Section 5.02.    Preservation and Disclosure of
Lists. The Trustee shall preserve, in as current a form as is reasonably practicable, all information as to the names and addresses of the Holders contained in the most recent list furnished to it as provided in Section 5.01 or maintained
by the Trustee in its capacity as Note Registrar, if so acting. The Trustee may destroy any list furnished to it as provided in Section 5.01 upon receipt of a new list so furnished. 

Article 6.    Defaults and Remedies 

Section 6.01.    Events of Default. Each of the following events shall be an “Event of
Default” with respect to the Notes: 
 a.    default in any payment of interest on any Note when due and
payable, and the default continues for a period of 10 days; 
 b.    default in the payment of principal of any Note
when due and payable on the Maturity Date, upon Optional Redemption, upon any required repurchase, upon declaration of acceleration or otherwise; 

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

d.    failure by the Company to comply with its obligation to redeem all Notes upon a Fundamental Change that has
continued for a period of 10 days; 
 e.    failure by the Company for 30 days after written notice from the Holders of
at least 51% in principal amount of the Notes then outstanding has been received by the Company to comply with any of its other agreements contained in the Notes or this Indenture; 

  
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 f.    default by the Company or any Significant Subsidiary of the
Company with respect to any mortgage, agreement or other instrument under which there may be outstanding, or by which there may be secured or evidenced, any indebtedness for money borrowed in excess of $50,000,000 (or its foreign currency
equivalent) in the aggregate of the Company and/or any such Significant Subsidiary, whether such indebtedness now exists or shall hereafter be created (i) resulting in such indebtedness becoming or being declared due and payable prior to its
stated maturity date or (ii) constituting a failure to pay the principal of any such debt when due and payable (after the expiration of all applicable grace periods) at its stated maturity, upon required repurchase, upon declaration of
acceleration or otherwise, and in the cases of clauses (i) and (ii), such acceleration shall not have been rescinded or annulled or such failure to pay or default shall not have been cured or waived, or such indebtedness is not paid or
discharged, as the case may be, within 30 days after written notice to the Company by the Trustee or to the Company and the Trustee by Holders of at least 51% in aggregate principal amount of Notes then outstanding in accordance with this Indenture;

 g.    one or more final, non-appealable judgments or orders is rendered
against the Company or any Significant Subsidiary, which requires the payment in money by the Company or any Significant Subsidiary, individually or in the aggregate, of an amount (net of amounts covered by insurance or bonded) in excess of
$50,000,000, and such judgment or judgments have not been satisfied, stayed, paid, discharged, vacated, bonded, annulled or rescinded within 60 days after (i) the date on which the right to appeal thereof has expired if no such appeal has
commenced, or (ii) the date on which all rights to appeal have been extinguished; 
 h.    the Company shall
commence a voluntary case or other proceeding seeking liquidation, reorganization or other relief with respect to the Company or its debts under any bankruptcy, insolvency or other similar law now or hereafter in effect or seeking the appointment of
a trustee, receiver, liquidator, custodian or other similar official of the Company or any substantial part of its property, or shall consent to any such relief or to the appointment of or taking possession by any such official in an involuntary
case or other proceeding commenced against it, or shall make a general assignment for the benefit of creditors; or 

i.    an involuntary case or other proceeding shall be commenced against the Company seeking liquidation, reorganization
or other relief with respect to the Company or its debts under any bankruptcy, insolvency or other similar law now or hereafter in effect or seeking the appointment of a trustee, receiver, liquidator, custodian or other similar official of the
Company or any substantial part of its property, and such involuntary case or other proceeding shall remain undismissed and unstayed for a period of 30 consecutive days. 

Section 6.02.    Acceleration; Rescission and Annulment. If one or more Events of Default shall have occurred
and be continuing (whatever the reason for such Event of Default and whether it shall be voluntary or involuntary or be effected by operation of law or pursuant to any judgment, decree or order of any court or any order, rule or regulation of any
administrative or governmental body), then, and in each and every such case (other than an Event of Default specified in Section 6.01(h) or Section 6.01(i)), unless the principal of all of the Notes shall have already become due and
payable, either the Trustee or the Holders of at least 51% in aggregate principal amount of the Notes then outstanding determined in accordance with Section 8.04, by notice in writing to the Company (and to the Trustee if given by Holders), may
(and the Trustee, 

  
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at the written request of such Holders, shall) declare 100% of the Capitalized Principal Amount of, and accrued and unpaid interest on, all the Notes to be due and payable immediately, and upon
any such declaration the same shall become and shall automatically be immediately due and payable, anything contained in this Indenture or in the Notes to the contrary notwithstanding. If an Event of Default specified in Section 6.01(h) or
Section 6.01(i) occurs and is continuing, 100% of the Capitalized Principal Amount of, and accrued and unpaid interest, if any, on, all Notes shall become and shall automatically be immediately due and payable. 

The immediately preceding paragraph, however, is subject to the conditions that if, at any time after the principal of the Notes shall have
been so declared due and payable, and before any judgment or decree for the payment of the monies due shall have been obtained or entered as hereinafter provided, the Company shall pay or shall deposit with the Trustee a sum sufficient to pay
installments of accrued and unpaid interest upon all Notes and the principal of any and all Notes that shall have become due otherwise than by acceleration (with interest on overdue installments of accrued and unpaid interest to the extent that
payment of such interest is enforceable under applicable law, and on such principal at the Cash Interest Rate borne by the Notes at such time) and amounts due to the Trustee pursuant to Section 7.06, and if (1) rescission would not
conflict with any judgment or decree of a court of competent jurisdiction and (2) any and all existing Events of Default under this Indenture, other than the nonpayment of the principal of and accrued and unpaid interest, if any, on Notes that
shall have become due solely by such acceleration, shall have been cured or waived pursuant to Section 6.08, then and in every such case (except as provided in the immediately succeeding sentence) the Holders of a majority in aggregate
principal amount of the Notes then outstanding, by written notice to the Company and to the Trustee, may waive all Defaults or Events of Default with respect to the Notes and rescind and annul such declaration and its consequences and such Default
shall cease to exist, and any Event of Default arising therefrom shall be deemed to have been cured for every purpose of this Indenture; but no such waiver or rescission and annulment shall extend to or shall affect any subsequent Default or Event
of Default, or shall impair any right consequent thereon. Notwithstanding anything to the contrary herein, no such waiver or rescission and annulment shall extend to or shall affect any Default or Event of Default resulting from (i) the
nonpayment of the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, or accrued and unpaid interest on, any Notes, (ii) a failure to repurchase any Notes when required or (iii) a
failure to pay or deliver, as the case may be, the consideration due upon conversion of the Notes. 

Section 6.03.    Payments of Notes on Default; Suit Therefor. If an Event of Default described in clause
(a) or (b) of Section 6.01 shall have occurred and be continuing, the Company shall, upon demand of the Trustee, pay to the Trustee, for the benefit of the Holders of the Notes, the whole amount then due and payable on the Notes for
principal and interest, if any, with interest on any overdue principal and interest, if any, at the Cash Interest Rate borne by the Notes at such time, and, in addition thereto, such further amount as shall be sufficient to cover any amounts due to
the Trustee under Section 7.06. If the Company shall fail to pay such amounts forthwith upon such demand, the Trustee, in its own name and as trustee of an express trust, may institute a judicial proceeding for the collection of the sums so due
and unpaid, may prosecute such proceeding to judgment or final decree and may enforce the same against the Company or any other obligor upon the Notes and collect the moneys adjudged or decreed to be payable in the manner provided by law out of the
property of the Company or any other obligor upon the Notes, wherever situated. 

  
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 In the event there shall be pending proceedings for the bankruptcy or for the reorganization
of the Company or any other obligor on the Notes under Title 11 of the United States Code, or any other applicable law, or in case a receiver, assignee or trustee in bankruptcy or reorganization, liquidator, sequestrator or similar official shall
have been appointed for or taken possession of the Company or such other obligor, the property of the Company or such other obligor, or in the event of any other judicial proceedings relative to the Company or such other obligor upon the Notes, or
to the creditors or property of the Company or such other obligor, the Trustee, irrespective of whether the principal of the Notes shall then be due and payable as therein expressed or by declaration or otherwise and irrespective of whether the
Trustee shall have made any demand pursuant to the provisions of this Section 6.03, shall be entitled and empowered, by intervention in such proceedings or otherwise, to file and prove a claim or claims for the whole amount of principal and
accrued and unpaid interest, if any, in respect of the Notes, and, in case of any judicial proceedings, to file such proofs of claim and other papers or documents and to take such other actions as it may deem necessary or advisable in order to have
the claims of the Trustee (including any claim for the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and counsel) and of the Holders allowed in such judicial proceedings relative to the Company or any other
obligor on the Notes, its or their creditors, or its or their property, and to collect and receive any monies or other property payable or deliverable on any such claims, and to distribute the same after the deduction of any amounts due to the
Trustee under Section 7.06; and any receiver, assignee or trustee in bankruptcy or reorganization, liquidator, custodian or similar official is hereby authorized by each of the Holders to make such payments to the Trustee, as administrative
expenses, and, in the event that the Trustee shall consent to the making of such payments directly to the Holders, to pay to the Trustee any amount due it for reasonable compensation, expenses, advances and disbursements, including agents and
counsel fees, and including any other amounts due to the Trustee under Section 7.06, incurred by it up to the date of such distribution. To the extent that such payment of reasonable compensation, expenses, advances and disbursements out of the
estate in any such proceedings shall be denied for any reason, payment of the same shall be secured by a lien on, and shall be paid out of, any and all distributions, dividends, monies, securities and other property that the Holders of the Notes may
be entitled to receive in such proceedings, whether in liquidation or under any plan of reorganization or arrangement or otherwise. 

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

All rights of action and of asserting claims under this Indenture, or under any of the Notes, may be enforced by the Trustee without the
possession of any of the Notes, or the production thereof at any trial or other proceeding relative thereto, and any such suit or proceeding instituted by the Trustee shall be brought in its own name as trustee of an express trust, and any recovery
of judgment shall, after provision for the payment of the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and counsel, be for the ratable benefit of the Holders of the Notes. 

  
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 In any proceedings brought by the Trustee (and in any proceedings involving the
interpretation of any provision of this Indenture to which the Trustee shall be a party) the Trustee shall be held to represent all the Holders of the Notes, and it shall not be necessary to make any Holders of the Notes parties to any such
proceedings. 
 In case the Trustee shall have proceeded to enforce any right under this Indenture and such proceedings shall have been
discontinued or abandoned because of any waiver pursuant to Section 6.08 or any rescission and annulment pursuant to Section 6.02 or for any other reason or shall have been determined adversely to the Trustee, then and in every such case
the Company, the Holders and the Trustee shall, subject to any determination in such proceeding, be restored respectively to their several positions and rights hereunder, and all rights, remedies and powers of the Company, the Holders and the
Trustee shall continue as though no such proceeding had been instituted. 
 Section 6.04.    Application of
Monies Collected by Trustee. Any monies collected by the Trustee pursuant to this Article 6 with respect to the Notes shall be applied in the following order, at the date or dates fixed by the Trustee for the distribution of such monies, upon
presentation of the several Notes, and stamping thereon the payment, if only partially paid, and upon surrender thereof, if fully paid: 

First, to the payment of all amounts due the Trustee under Section 7.06; 

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

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

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

Section 6.05.    Proceedings by Holders. Except to enforce the right to receive payment of principal
(including, if applicable, the Redemption Price and the Fundamental Change Repurchase Price) or interest when due, or the right to receive payment or delivery of the consideration due upon conversion, no Holder of any Note shall have any right by
virtue of or by availing of any provision of this Indenture to institute any suit, action or proceeding in equity or at law upon or under or with respect to this Indenture, or for the appointment of a receiver, trustee, liquidator, custodian or
other similar official, or for any other remedy hereunder, unless: 
 a.    such Holder previously shall have given to
the Trustee written notice of an Event of Default and of the continuance thereof, as herein provided; 
 b.    Holders
of at least 51% in aggregate principal amount of the Notes then outstanding shall have made written request upon the Trustee to institute such action, suit or proceeding in its own name as Trustee hereunder; 

c.    such Holders shall have offered to the Trustee such security or indemnity reasonably satisfactory to it against any
loss, liability or expense to be incurred therein or thereby; 
 d.    the Trustee for 60 days after its receipt of such
notice, request and offer of such security or indemnity, shall have neglected or refused to institute any such action, suit or proceeding; and 

e.    no direction that, in the opinion of the Trustee, is inconsistent with such written request shall have been given to
the Trustee by the Holders of a majority of the aggregate principal amount of the Notes then outstanding within such 60-day period pursuant to Section 6.08, 

it being understood and intended, and being expressly covenanted by the taker and Holder of every Note with every other taker and Holder and the Trustee that
no one or more Holders shall have any right in any manner whatever by virtue of or by availing of any provision of this Indenture to affect, disturb or prejudice the rights of any other Holder, or to obtain or seek to obtain priority over or
preference to any other such Holder, or to enforce any right under this Indenture, except in the manner herein provided and for the equal, ratable and common benefit of all Holders (except as otherwise provided herein). For the protection and
enforcement of this Section 6.05, each and every Holder and the Trustee shall be entitled to such relief as can be given either at law or in equity. 

Notwithstanding any other provision of this Indenture and any provision of any Note, each Holder shall have the right to receive payment or
delivery, as the case may be, of (x) the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, (y) accrued and unpaid interest, if any, on, and (z) the consideration due upon
conversion of, such Note, on or after the respective due dates expressed or provided for in such Note or in this Indenture, or to institute suit for the enforcement of any such payment or delivery, as the case may be. 

  
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 Section 6.06.    Proceedings by Trustee. In case of an Event
of Default, the Trustee may in its discretion proceed to protect and enforce the rights vested in it by this Indenture by such appropriate judicial proceedings as are necessary to protect and enforce any of such rights, either by suit in equity or
by action at law or by proceeding in bankruptcy or otherwise, whether for the specific enforcement of any covenant or agreement contained in this Indenture or in aid of the exercise of any power granted in this Indenture, or to enforce any other
legal or equitable right vested in the Trustee by this Indenture or by law. 
 Section 6.07.    Remedies
Cumulative and Continuing. Except as provided in the last paragraph of Section 2.06, all powers and remedies given by this Article 6 to the Trustee or to the Holders shall, to the extent permitted by law, be deemed cumulative and not
exclusive of any thereof or of any other powers and remedies available to the Trustee or the Holders of the Notes, by judicial proceedings or otherwise, to enforce the performance or observance of the covenants and agreements contained in this
Indenture, and no delay or omission of the Trustee or of any Holder of any of the Notes to exercise any right or power accruing upon any Default or Event of Default shall impair any such right or power, or shall be construed to be a waiver of any
such Default or Event of Default or any acquiescence therein; and, subject to the provisions of Section 6.05, every power and remedy given by this Article 6 or by law to the Trustee or to the Holders may be exercised from time to time, and as
often as shall be deemed expedient, by the Trustee or by the Holders. 
 Section 6.08.    Direction of
Proceedings and Waiver of Defaults by Majority of Holders. The Holders of a majority of the aggregate principal amount of the Notes at the time outstanding determined in accordance with Section 8.04 shall have the right to direct the time,
method and place of conducting any proceeding for any remedy available to the Trustee or exercising any trust or power conferred on the Trustee with respect to the Notes; provided, however, that such direction shall not be in conflict
with any rule of law or with this Indenture, and the Trustee may take any other action deemed proper by the Trustee that is not inconsistent with such direction. The Trustee may refuse to follow any direction that it determines is unduly prejudicial
to the rights of any other Holder or that would involve the Trustee in personal liability. The Holders of a majority in aggregate principal amount of the Notes at the time outstanding determined in accordance with Section 8.04 may on behalf of
the Holders of all of the Notes waive any past Default or Event of Default hereunder and its consequences except a default in the payment of accrued and unpaid interest, if any, on, or the principal (including any Redemption Price and any
Fundamental Change Repurchase Price) of, the Notes when due that has not been cured pursuant to the provisions of Section 6.01, a failure by the Company to pay or deliver, as the case may be, the consideration due upon conversion of the Notes
or a default in respect of a covenant or provision hereof which under Article 10 cannot be modified or amended without the consent of each Holder of an outstanding Note affected. Upon any such waiver the Company, the Trustee and the Holders of the
Notes shall be restored to their former positions and rights hereunder; but no such waiver shall extend to any subsequent or other Default or Event of Default or impair any right consequent thereon. Whenever any Default or Event of Default hereunder
shall have been waived as permitted by this Section 6.08, said Default or Event of Default shall for all purposes of the Notes and this Indenture be deemed to have been cured and to be not continuing; but no such waiver shall extend to any
subsequent or other Default or Event of Default or impair any right consequent thereon. 

  
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 Section 6.09.    Notice of Defaults. The Trustee shall,
within 90 days after the occurrence and continuance of a Default of which a Responsible Officer has actual knowledge, deliver to all Holders notice of all Defaults known to a Responsible Officer, unless such Defaults shall have been cured or waived
before the giving of such notice; provided that, except in the case of a Default in the payment of the principal of (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable), or accrued and unpaid interest
on, any of the Notes or a Default in the payment or delivery of the consideration due upon conversion, the Trustee shall be protected in withholding such notice if and so long as a committee of Responsible Officers of the Trustee in good faith
determines that the withholding of such notice is in the interests of the Holders. 

Section 6.10.    Undertaking to Pay Costs. All parties to this Indenture agree, and each Holder of any Note by
its acceptance thereof shall be deemed to have agreed, that any court may, in its discretion, require, in any suit for the enforcement of any right or remedy under this Indenture, or in any suit against the Trustee for any action taken or omitted by
it as Trustee, the filing by any party litigant in such suit of an undertaking to pay the costs of such suit and that such court may in its discretion assess reasonable costs, including reasonable attorneys’ fees and expenses, against any party
litigant in such suit, having due regard to the merits and good faith of the claims or defenses made by such party litigant; provided that the provisions of this Section 6.10 (to the extent permitted by law) shall not apply to any suit
instituted by the Trustee, to any suit instituted by any Holder, or group of Holders, holding in the aggregate more than 10% in principal amount of the Notes at the time outstanding determined in accordance with Section 8.04, or to any suit
instituted by any Holder for the enforcement of the payment of the principal of or accrued and unpaid interest, if any, on any Note (including, but not limited to, the Redemption Price and the Fundamental Change Repurchase Price, if applicable) on
or after the due date expressed or provided for in such Note or to any suit for the enforcement of the right to convert any Note, or receive the consideration due upon conversion, in accordance with the provisions of Article 14. 

Article 7.    Concerning the Trustee 

Section 7.01.    Duties and Responsibilities of Trustee. The Trustee, prior to the occurrence of an Event of
Default and after the curing or waiver of all Events of Default that may have occurred, undertakes to perform such duties and only such duties as are specifically set forth in this Indenture. In the event an Event of Default has occurred and is
continuing, the Trustee shall exercise such of the rights and powers vested in it by this Indenture, and use the same degree of care and skill in its exercise, as a prudent person would exercise or use under the circumstances in the conduct of such
person’s own affairs; provided that if an Event of Default occurs and is continuing, the Trustee will be under no obligation to exercise any of the rights or powers under this Indenture at the request or direction of any of the Holders
unless such Holders have offered to the Trustee indemnity or security reasonably satisfactory to it against any loss, liability or expense that might be incurred by it in compliance with such request or direction. 

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

a.    prior to the occurrence of an Event of Default and after the curing or waiving of all Events of Default that may
have occurred: 
 i.    the duties and obligations of the Trustee shall be determined solely by the
express provisions of this Indenture, and the Trustee shall not be liable except for the performance of such duties and obligations as are specifically set forth in this Indenture and no implied covenants or obligations shall be read into this
Indenture against the Trustee; and 
 ii.    in the absence of bad faith and willful misconduct on the
part of the Trustee, the Trustee may conclusively rely, as to the truth of the statements and the correctness of the opinions expressed therein, upon any certificates or opinions furnished to the Trustee and conforming to the requirements of this
Indenture; but, in the case of any such certificates or opinions that by any provisions hereof are specifically required to be furnished to the Trustee, the Trustee shall be under a duty to examine the same to determine whether or not they conform
to the requirements of this Indenture (but need not confirm or investigate the accuracy of any mathematical calculations or other facts stated therein); 

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

c.    the Trustee shall not be liable with respect to any action taken or omitted to be taken by it in good faith in
accordance with the direction of the Holders of not less than a majority of the aggregate principal amount of the Notes at the time outstanding determined as provided in Section 8.04 relating to the time, method and place of conducting any
proceeding for any remedy available to the Trustee, or exercising any trust or power conferred upon the Trustee, under this Indenture; 

d.    whether or not therein provided, every provision of this Indenture relating to the conduct or affecting the
liability of, or affording protection to, the Trustee shall be subject to the provisions of this Section; 
 e.    the
Trustee shall not be liable in respect of any payment (as to the correctness of amount, entitlement to receive or any other matters relating to payment) or notice effected by the Company or any Paying Agent or any records maintained by any co-Note Registrar with respect to the Notes; 
 f.    if any party fails to deliver a
notice relating to an event the fact of which, pursuant to this Indenture, requires notice to be sent to the Trustee, the Trustee may conclusively rely on its failure to receive such notice as reason to act as if no such event occurred, unless a
Responsible Officer of the Trustee had actual knowledge of such event; 
 g.    in the absence of written investment
direction from the Company, all cash received by the Trustee shall be placed in a non-interest bearing trust account, and in no event shall the Trustee be liable for the selection of investments or for
investment losses incurred thereon or for losses incurred as a result of the liquidation of any such investment prior to its 

  
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maturity date or the failure of the party directing such investments prior to its maturity date or the failure of the party directing such investment to provide timely written investment
direction, and the Trustee shall have no obligation to invest or reinvest any amounts held hereunder in the absence of such written investment direction from the Company; and 

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

None of the provisions contained in this Indenture shall require the Trustee to expend or risk its own funds or otherwise incur personal
financial liability in the performance of any of its duties or in the exercise of any of its rights or powers. 

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

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

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

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

d.    the Trustee shall not be bound to make any investigation into the facts or matters stated in any resolution,
certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture or other paper or document, but the Trustee, in its discretion, may make such further inquiry or investigation into such facts or
matters as it may see fit, and, if the Trustee shall determine to make such further inquiry or investigation, it shall be entitled to examine the books, records and premises of the Company, personally or by agent or attorney at the expense of the
Company and shall incur no liability of any kind by reason of such inquiry or investigation; 
 e.    the Trustee may
execute any of the trusts or powers hereunder or perform any duties hereunder either directly or by or through agents, custodians, nominees or attorneys and the Trustee shall not be responsible for any misconduct or negligence on the part of any
agent, custodian, nominee or attorney appointed by it with due care hereunder; and 
 f.    the permissive rights of the
Trustee enumerated herein shall not be construed as duties. 

  
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 In no event shall the Trustee be liable for any consequential loss or damage of any kind
whatsoever (including but not limited to lost profits), even if the Trustee has been advised of the likelihood of such loss or damage and regardless of the form of action other than any such loss or damage caused by the Trustee’s willful
misconduct or gross negligence. The Trustee shall not be charged with knowledge of any Default or Event of Default with respect to the Notes, unless either (1) a Responsible Officer shall have actual knowledge of such Default or Event of
Default or (2) written notice of such Default or Event of Default shall have been given to the Trustee by the Company or by any Holder of the Notes. 

Section 7.03.    No Responsibility for Recitals, Etc. The recitals contained herein and in the Notes (except
in the Trustee’s certificate of authentication) shall be taken as the statements of the Company, and the Trustee assumes no responsibility for the correctness of the same. The Trustee makes no representations as to the validity or sufficiency
of this Indenture or of the Notes. The Trustee shall not be accountable for the use or application by the Company of any Notes or the proceeds of any Notes authenticated and delivered by the Trustee in conformity with the provisions of this
Indenture. 
 Section 7.04.    Trustee, Paying Agents, Conversion Agents or Note Registrar May Own Notes.
The Trustee, any Paying Agent, any Conversion Agent or Note Registrar, in its individual or any other capacity, may become the owner or pledgee of Notes with the same rights it would have if it were not the Trustee, Paying Agent, Conversion Agent or
Note Registrar. 
 Section 7.05.    Monies and Shares of Common Stock to Be Held in Trust. All monies and
shares of Common Stock received by the Trustee shall, until used or applied as herein provided, be held in trust for the purposes for which they were received. Money and shares of Common Stock held by the Trustee in trust hereunder need not be
segregated from other funds except to the extent required by law. The Trustee shall be under no liability for interest on any money or shares of Common Stock received by it hereunder except as may be agreed from time to time by the Company and the
Trustee. 
 Section 7.06.    Compensation and Expenses of Trustee. The Company covenants and agrees to pay
to the Trustee from time to time, and the Trustee shall be entitled to, reasonable compensation for all services rendered by it hereunder in any capacity (which shall not be limited by any provision of law in regard to the compensation of a trustee
of an express trust) as mutually agreed to in writing between the Trustee and the Company, and the Company will pay or reimburse the Trustee upon its request for all reasonable expenses, disbursements and advances reasonably incurred or made by the
Trustee in accordance with any of the provisions of this Indenture in any capacity thereunder (including the reasonable compensation and the expenses and disbursements of its agents and counsel and of all Persons not regularly in its employ) except
any such expense, disbursement or advance as shall have been caused by its gross negligence, willful misconduct or bad faith. The Company also covenants to indemnify the Trustee in any capacity under this Indenture and any other document or
transaction entered into in connection herewith and its agents and any authenticating agent for, and to hold them harmless against, any loss, claim, damage, liability or expense incurred without gross negligence, willful misconduct or bad faith on
the part of the Trustee, its officers, directors, agents or employees, or such agent or authenticating agent, as the case may be, and arising out of or in connection with the acceptance or administration of this Indenture or in any other capacity


  
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hereunder, including the costs and expenses of defending themselves against any claim of liability in the premises. The obligations of the Company under this Section 7.06 to compensate or
indemnify the Trustee and to pay or reimburse the Trustee for expenses, disbursements and advances shall be secured by a senior claim to which the Notes are hereby made subordinate on all money or property held or collected by the Trustee, except,
subject to the effect of Section 6.04, funds held in trust herewith for the benefit of the Holders of particular Notes. The Trustee’s right to receive payment of any amounts due under this Section 7.06 shall not be subordinate to any
other liability or indebtedness of the Company. The obligation of the Company under this Section 7.06 shall survive the satisfaction and discharge of this Indenture and the earlier resignation or removal of the Trustee. The Company need not pay
for any settlement made without its consent, which consent shall not be unreasonably withheld. The indemnification provided in this Section 7.06 shall extend to the officers, directors, agents and employees of the Trustee. 

Without prejudice to any other rights available to the Trustee under applicable law, when the Trustee and its agents and any authenticating
agent incur expenses or render services after an Event of Default specified in Section 6.01(h) or Section 6.01(i) occurs, the expenses and the compensation for the services are intended to constitute expenses of administration under any
bankruptcy, insolvency or similar laws. 
 Section 7.07.    Officer’s Certificate as
Evidence. Except as otherwise provided in Section 7.01, whenever in the administration of the provisions of this Indenture the Trustee shall deem it necessary or desirable that a matter be proved or established prior to taking or omitting
any action hereunder, such matter (unless other evidence in respect thereof be herein specifically prescribed) may, in the absence of gross negligence, willful misconduct, recklessness and bad faith on the part of the Trustee, be deemed to be
conclusively proved and established by an Officer’s Certificate delivered to the Trustee, and such Officer’s Certificate, in the absence of gross negligence, willful misconduct, recklessness and bad faith on the part of the Trustee, shall
be full warrant to the Trustee for any action taken or omitted by it under the provisions of this Indenture upon the faith thereof. 

Section 7.08.    Eligibility of Trustee. There shall at all times be a Trustee hereunder which shall be a
Person that is eligible pursuant to the Trust Indenture Act (as if the Trust Indenture Act were applicable hereto) to act as such and has a combined capital and surplus of at least $50,000,000. If such Person publishes reports of condition at least
annually, pursuant to law or to the requirements of any supervising or examining authority, then for the purposes of this Section, the combined capital and surplus of such Person shall be deemed to be its combined capital and surplus as set forth in
its most recent report of condition so published. If at any time the Trustee shall cease to be eligible in accordance with the provisions of this Section, it shall resign immediately in the manner and with the effect hereinafter specified in this
Article. 
 Section 7.09.    Resignation or Removal of Trustee. 

a.    The Trustee may at any time resign by giving written notice of such resignation to the Company and by delivering
notice thereof to the Holders. Upon receiving such notice of resignation, the Company shall promptly appoint a successor trustee by written instrument, in duplicate, executed by order of the Board of Directors, one copy of which instrument shall be


  
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delivered to the resigning Trustee and one copy to the successor trustee. If no successor trustee shall have been so appointed and have accepted appointment within 60 days after the giving of
such notice of resignation to the Holders, the resigning Trustee may, upon 10 Business Days’ notice to the Company and the Holders, petition any court of competent jurisdiction for the appointment of a successor trustee, or any Holder who has
been a bona fide holder of a Note or Notes for at least six months (or since the date of this Indenture) may, subject to the provisions of Section 6.10, on behalf of himself or herself and all others similarly situated, petition any such court
for the appointment of a successor trustee. Such court may thereupon, after such notice, if any, as it may deem proper and prescribe, appoint a successor trustee. 

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

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

ii.    the Trustee shall become incapable of acting, or shall be adjudged a bankrupt or insolvent, or a
receiver of the Trustee or of its property shall be appointed, or any public officer shall take charge or control of the Trustee or of its property or affairs for the purpose of rehabilitation, conservation or liquidation, 

then, in either case, the Company may by a Board Resolution remove the Trustee and appoint a successor trustee by written instrument, in duplicate, executed
by order of the Board of Directors, one copy of which instrument shall be delivered to the Trustee so removed and one copy to the successor trustee, or, subject to the provisions of Section 6.10, any Holder who has been a bona fide holder of a
Note or Notes for at least six months (or since the date of this Indenture) may, on behalf of himself or herself and all others similarly situated, petition any court of competent jurisdiction for the removal of the Trustee and the appointment of a
successor trustee. Such court may thereupon, after such notice, if any, as it may deem proper and prescribe, remove the Trustee and appoint a successor trustee. 

c.    The Holders of a majority in aggregate principal amount of the Notes at the time outstanding, as determined in
accordance with Section 8.04, may at any time remove the Trustee and nominate a successor trustee that shall be deemed appointed as successor trustee unless within 10 days after notice to the Company of such nomination the Company objects
thereto, in which case the Trustee so removed or any Holder, upon the terms and conditions and otherwise as in Section 7.09(a) provided, may petition any court of competent jurisdiction for an appointment of a successor trustee. 

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

Section 7.10.    Acceptance by Successor Trustee. Any successor trustee appointed as provided in
Section 7.09 shall execute, acknowledge and deliver to the Company and to its predecessor trustee an instrument accepting such appointment hereunder, and thereupon the resignation or removal of the predecessor trustee shall become effective and
such successor 

  
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trustee, without any further act, deed or conveyance, shall become vested with all the rights, powers, duties and obligations of its predecessor hereunder, with like effect as if originally named
as Trustee herein; but, nevertheless, on the written request of the Company or of the successor trustee, the trustee ceasing to act shall, upon payment of any amounts then due it pursuant to the provisions of Section 7.06, execute and deliver
an instrument transferring to such successor trustee all the rights and powers of the trustee so ceasing to act. Upon request of any such successor trustee, the Company shall execute any and all instruments in writing for more fully and certainly
vesting in and confirming to such successor trustee all such rights and powers. Any trustee ceasing to act shall, nevertheless, retain a senior claim to which the Notes are hereby made subordinate on all money or property held or collected by such
trustee as such, except for funds held in trust for the benefit of Holders of particular Notes, to secure any amounts then due it pursuant to the provisions of Section 7.06. 

No successor trustee shall accept appointment as provided in this Section 7.10 unless at the time of such acceptance such successor
trustee shall be eligible under the provisions of Section 7.08. 
 Upon acceptance of appointment by a successor trustee as provided in
this Section 7.10, each of the Company and the successor trustee, at the written direction and at the expense of the Company shall deliver or cause to be delivered notice of the succession of such trustee hereunder to the Holders. If the
Company fails to deliver such notice within ten days after acceptance of appointment by the successor trustee, the successor trustee shall cause such notice to be delivered at the expense of the Company. 

Section 7.11.    Succession by Merger, Etc. Any corporation or other entity into which the Trustee may be
merged or converted or with which it may be consolidated, or any corporation or other entity resulting from any merger, conversion or consolidation to which the Trustee shall be a party, or any corporation or other entity succeeding to all or
substantially all of the corporate trust business of the Trustee (including the administration of this Indenture), shall be the successor to the Trustee hereunder without the execution or filing of any paper or any further act on the part of any of
the parties hereto; provided that in the case of any corporation or other entity succeeding to all or substantially all of the corporate trust business of the Trustee such corporation or other entity shall be eligible under the provisions of
Section 7.08. 
 In case at the time such successor to the Trustee shall succeed to the trusts created by this Indenture, any of the
Notes shall have been authenticated but not delivered, any such successor to the Trustee may adopt the certificate of authentication of any predecessor trustee or authenticating agent appointed by such predecessor trustee, and deliver such Notes so
authenticated; and in case at that time any of the Notes shall not have been authenticated, any successor to the Trustee or an authenticating agent appointed by such successor trustee may authenticate such Notes either in the name of any predecessor
trustee hereunder or in the name of the successor trustee; and in all such cases such certificates shall have the full force which it is anywhere in the Notes or in this Indenture provided that the certificate of the Trustee shall have;
provided, however, that the right to adopt the certificate of authentication of any predecessor trustee or to authenticate Notes in the name of any predecessor trustee shall apply only to its successor or successors by merger,
conversion or consolidation. 

  
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 Section 7.12.    Trustee’s Application for
Instructions from the Company. Any application by the Trustee for written instructions from the Company (other than with regard to any action proposed to be taken or omitted to be taken by the Trustee that affects the rights of the Holders of
the Notes under this Indenture) may, at the option of the Trustee, set forth in writing any action proposed to be taken or omitted by the Trustee under this Indenture and the date on and/or after which such action shall be taken or such omission
shall be effective. The Trustee shall not be liable to the Company for any action taken by, or omission of, the Trustee in accordance with a proposal included in such application on or after the date specified in such application (which date shall
not be less than three Business Days after the date any Officer that the Company has indicated to the Trustee should receive such application actually receives such application, unless any such Officer shall have consented in writing to any earlier
date), unless, prior to taking any such action (or the effective date in the case of any omission), the Trustee shall have received written instructions in accordance with this Indenture in response to such application specifying the action to be
taken or omitted. 
 Article 8.    Concerning the Holders 

Section 8.01.    Action by Holders. Whenever in this Indenture it is provided that the Holders of a specified
percentage of the aggregate principal amount of the Notes may take any action (including the making of any demand or request, the giving of any notice, consent or waiver or the taking of any other action), the fact that at the time of taking any
such action, the Holders of such specified percentage have joined therein may be evidenced by any instrument or any number of instruments of similar tenor executed by Holders in person or by agent or proxy appointed in writing, or by the record of
the Holders voting in favor thereof at any meeting of Holders duly called and held in accordance with the provisions of Article 9, or by a combination of such instrument or instruments and any such record of such a meeting of Holders. Whenever the
Company or the Trustee solicits the taking of any action by the Holders of the Notes, the Company or the Trustee may, but shall not be required to, fix in advance of such solicitation, a date as the record date for determining Holders entitled to
take such action. The record date if one is selected shall be not more than 15 days prior to the date of commencement of solicitation of such action. 

Section 8.02.    Proof of Execution by Holders. Subject to the provisions of Section 7.01,
Section 7.02 and Section 9.05, proof of the execution of any instrument by a Holder or its agent or proxy shall be sufficient if made in accordance with such reasonable rules and regulations as may be prescribed by the Trustee or in such
manner as shall be satisfactory to the Trustee. The holding of Notes shall be proved by the Note Register or by a certificate of the Note Registrar. The record of any Holders’ meeting shall be proved in the manner provided in Section 9.06.

 Section 8.03.    Who Are Deemed Absolute Owners. The Company, the Trustee, any authenticating agent, any
Paying Agent, any Conversion Agent and any Note Registrar may deem the Person in whose name a Note shall be registered upon the Note Register to be, and may treat it as, the absolute owner of such Note (whether or not such Note shall be overdue and
notwithstanding any notation of ownership or other writing thereon made by any Person other than the Company or any Note Registrar) for the purpose of receiving payment of or on account of the principal (including any Redemption Price and any
Fundamental Change Repurchase Price) of and (subject to Section 2.03) accrued and unpaid interest on such Note, for conversion 

  
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of such Note and for all other purposes; and neither the Company nor the Trustee nor any Paying Agent nor any Conversion Agent nor any Note Registrar shall be affected by any notice to the
contrary. All such payments or deliveries so made to any Holder for the time being, or upon its order, shall be valid, and, to the extent of the sums or shares of Common Stock so paid or delivered, effectual to satisfy and discharge the liability
for monies payable or shares deliverable upon any such Note. 
 Section 8.04.    Company-Owned Notes
Disregarded. In determining whether the Holders of the requisite aggregate principal amount of Notes have concurred in any direction, consent, waiver or other action under this Indenture, Notes that are owned by the Company or by any Subsidiary
thereof shall be disregarded and deemed not to be outstanding for the purpose of any such determination; provided that for the purposes of determining whether the Trustee shall be protected in relying on any such direction, consent, waiver or
other action only Notes that a Responsible Officer knows are so owned shall be so disregarded. Notes so owned that have been pledged in good faith may be regarded as outstanding for the purposes of this Section 8.04 if the pledgee shall
establish to the satisfaction of the Trustee the pledgee’s right to so act with respect to such Notes and that the pledgee is not the Company or a Subsidiary thereof. In the case of a dispute as to such right, any decision by the Trustee taken
upon the advice of counsel shall be full protection to the Trustee. Upon request of the Trustee, the Company shall furnish to the Trustee promptly an Officer’s Certificate listing and identifying all Notes, if any, known by the Company to be
owned or held by or for the account of any of the above described Persons; and, subject to Section 7.01, the Trustee shall be entitled to accept such Officer’s Certificate as conclusive evidence of the facts therein set forth and of the
fact that all Notes not listed therein are outstanding for the purpose of any such determination. 

Section 8.05.    Revocation of Consents; Future Holders Bound. At any time prior to (but not after) the
evidencing to the Trustee, as provided in Section 8.01, of the taking of any action by the Holders of the percentage of the aggregate principal amount of the Notes specified in this Indenture in connection with such action, any Holder of a Note
that is shown by the evidence to be included in the Notes the Holders of which have consented to such action may, by filing written notice with the Trustee at its Corporate Trust Office and upon proof of holding as provided in Section 8.02,
revoke such action so far as concerns such Note. Except as aforesaid, any such action taken by the Holder of any Note shall be conclusive and binding upon such Holder and upon all future Holders and owners of such Note and of any Notes issued in
exchange or substitution therefor or upon registration of transfer thereof, irrespective of whether any notation in regard thereto is made upon such Note or any Note issued in exchange or substitution therefor or upon registration of transfer
thereof. 
 Article 9.    Holders’ Meetings 

Section 9.01.    Purpose of Meetings. A meeting of Holders may be called at any time and from time to time
pursuant to the provisions of this Article 9 for any of the following purposes: 
 a.    to give any notice to the
Company or to the Trustee or to give any directions to the Trustee permitted under this Indenture, or to consent to the waiving of any Default or Event of Default hereunder (in each case, as permitted under this Indenture) and its consequences, or
to take any other action authorized to be taken by Holders pursuant to any of the provisions of Article 6; 

  
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 b.    to remove the Trustee and nominate a successor trustee pursuant to
the provisions of Article 7; 
 c.    to consent to the execution of an indenture or indentures supplemental hereto
pursuant to the provisions of Section 10.02; or 
 d.    to take any other action authorized to be taken by or on
behalf of the Holders of any specified aggregate principal amount of the Notes under any other provision of this Indenture or under applicable law. 

Section 9.02.    Call of Meetings by Trustee. The Trustee may at any time call a meeting of Holders to take
any action specified in Section 9.01, to be held at such time and at such place as the Trustee shall determine. Notice of every meeting of the Holders, setting forth the time and the place of such meeting and in general terms the action
proposed to be taken at such meeting and the establishment of any record date pursuant to Section 8.01, shall be delivered to Holders of such Notes. Such notice shall also be delivered to the Company. Such notices shall be delivered not less
than 20 nor more than 90 days prior to the date fixed for the meeting. 
 Any meeting of Holders shall be valid without notice if the
Holders of all Notes then outstanding are present in person or by proxy or if notice is waived before or after the meeting by the Holders of all Notes then outstanding, and if the Company and the Trustee are either present by duly authorized
representatives or have, before or after the meeting, waived notice. 
 Section 9.03.    Call of Meetings by
Company or Holders. In case at any time the Company, pursuant to a Board Resolution, or the Holders of at least 10% of the aggregate principal amount of the Notes then outstanding, shall have requested the Trustee to call a meeting of Holders,
by written request setting forth in reasonable detail the action proposed to be taken at the meeting, and the Trustee shall not have delivered the notice of such meeting within 20 days after receipt of such request, then the Company or such Holders
may determine the time and the place for such meeting and may call such meeting to take any action authorized in Section 9.01, by delivering notice thereof as provided in Section 9.02. 

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

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

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

Subject to the provisions of Section 8.04, at any meeting of Holders each Holder or proxyholder shall be entitled to one vote for each
$1,000 principal amount of Notes held or represented by him or her; provided, however, that no vote shall be cast or counted at any meeting in respect of any Note challenged as not outstanding and ruled by the chair of the meeting to
be not outstanding. The chair of the meeting shall have no right to vote other than by virtue of Notes held by it or instruments in writing as aforesaid duly designating it as the proxy to vote on behalf of other Holders. Any meeting of Holders duly
called pursuant to the provisions of Section 9.02 or Section 9.03 may be adjourned from time to time by the Holders of a majority of the aggregate principal amount of Notes represented at the meeting, whether or not constituting a quorum,
and the meeting may be held as so adjourned without further notice. 
 Section 9.06.    Voting. The vote
upon any resolution submitted to any meeting of Holders shall be by written ballot on which shall be subscribed the signatures of the Holders or of their representatives by proxy and the outstanding aggregate principal amount of the Notes held or
represented by them. The permanent chair of the meeting shall appoint two inspectors of votes who shall count all votes cast at the meeting for or against any resolution and who shall make and file with the secretary of the meeting their verified
written reports in duplicate of all votes cast at the meeting. A record in duplicate of the proceedings of each meeting of Holders shall be prepared by the secretary of the meeting and there shall be attached to said record the original reports of
the inspectors of votes on any vote by ballot taken thereat and affidavits by one or more Persons having knowledge of the facts setting forth a copy of the notice of the meeting and showing that said notice was delivered as provided in
Section 9.02. The record shall show the aggregate principal amount of the Notes voting in favor of or against any resolution. The record shall be signed and verified by the affidavits of the permanent chairman and secretary of the meeting and
one of the duplicates shall be delivered to the Company and the other to the Trustee to be preserved by the Trustee, the latter to have attached thereto the ballots voted at the meeting. 

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

Section 9.07.    No Delay of Rights by Meeting. Nothing contained in this Article 9 shall be deemed or
construed to authorize or permit, by reason of any call of a meeting of Holders or any rights expressly or impliedly conferred hereunder to make such call, any hindrance or delay in the exercise of any right or rights conferred upon or reserved to
the Trustee or to the Holders under any of the provisions of this Indenture or of the Notes. 

  
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 Article 10.    Supplemental Indentures 

Section 10.01.    Supplemental Indentures Without Consent of Holders. The Company and the Trustee, at the
Company’s expense, may from time to time and at any time amend the Notes or enter into an indenture or indentures supplemental hereto in each case for one or more of the following purposes: 

a.    to cure any mistake, ambiguity, omission, defect or inconsistency; 

b.    to provide for the assumption by a Successor Corporation of the obligations of the Company under the Notes and this
Indenture pursuant to Article 11; 
 c.    to add guarantees with respect to the Notes; 

d.    to secure the Notes; 

e.    to add to the covenants or Events of Default of the Company for the benefit of the Holders or surrender any right or
power conferred upon the Company; 
 f.    to make any change that does not, individually or in the aggregate with all
other such changes, materially adversely affect the rights of any Holder; 
 g.    in connection with any Merger Event,
to provide that the Notes are convertible into Reference Property, subject to the provisions of Section 14.02, and make such related changes to the terms of the Notes to the extent expressly required by Section 14.06; 

h.    to comply with the rules of any applicable Depositary, including The Depository Trust Company, so long as such
amendment does not adversely affect the rights of any Holder in any material respect; 
 i.    to increase the
Conversion Rate as provided in this Indenture; 
 j.    to provide for the acceptance of appointment by a Trustee or
successor Trustee, security registrar, Paying Agent or Conversion Agent, or to facilitate the administration of the trusts under this Indenture by more than one trustee; 

k.    to irrevocably elect a Settlement Method or a Specified Dollar Amount, or eliminate the Company’s right to
elect a Settlement Method; provided that no such election or elimination shall affect any Settlement Method theretofore elected (or deemed to be elected) with respect to any Note pursuant to the provisions of Article 14; 

l.    to irrevocably elect a Company Conversion Settlement Method or a Company Conversion Specified Dollar Amount, or
eliminate the Company’s right to elect a Company Conversion Settlement Method; provided that no such election or elimination shall affect any Company Conversion Settlement Method theretofore elected (or deemed to be elected) with respect
to any Note pursuant to the provisions of Article 13; 
 m.    to make PIK Payments (including to issue PIK Notes) or
facilitate the same. 

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

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

Section 10.02.    Supplemental Indentures with Consent of Holders. With the consent (evidenced as provided in
Article 8) of the Holders of at least a majority of the aggregate principal amount of the Notes then outstanding (determined in accordance with Article 8 and including, without limitation, consents obtained in connection with a repurchase of, or
tender or exchange offer for, Notes), the Company and the Trustee, at the Company’s expense, may from time to time and at any time amend the Notes and/or enter into an indenture or indentures supplemental hereto in each case for the purpose of
adding any provisions to or changing in any manner or eliminating any of the provisions of this Indenture, the Notes or any supplemental indenture or of modifying in any manner the rights of the Holders; provided, however, that,
without the consent of each Holder of an outstanding Note affected, no such amendment or supplemental indenture shall: 

a.    reduce the amount of Notes whose Holders must consent to any amendment, supplement, waiver or other modification;

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

c.    reduce the principal of or extend the Maturity Date of any Note; 

d.    except as expressly required by this Indenture, make any change that adversely affects the conversion rights of any
Notes; 
 e.    reduce the Redemption Price or the Fundamental Change Repurchase Price of any Note or change the times
at which, or the circumstances under which, the Notes will be redeemed or repurchased by the Company; 
 f.    make any
Note payable in a currency, or at a place of payment, other than that stated in the Note; 
 g.    change the ranking of
the Notes; or 
 h.    make any direct or indirect change in this Article 10 that requires each Holder’s consent or
in the waiver provisions in Section 6.02 or Section 6.08. 
 Upon the written request of the Company, and upon the filing with the
Trustee of evidence of the consent of Holders as aforesaid and subject to Section 10.05, the Trustee shall join with the Company in the execution of such amendment or supplemental indenture unless


  
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such amendment or supplemental indenture affects the Trustee’s own rights, duties or immunities under this Indenture or otherwise, in which case the Trustee may in its discretion, but shall
not be obligated to, enter into such amendment or supplemental indenture. 
 Holders do not need under this Section 10.02 to approve
the particular form of any proposed amendment or supplemental indenture. It shall be sufficient if such Holders approve the substance thereof. After any such amendment or supplemental indenture becomes effective, the Company shall deliver to the
Holders a notice briefly describing such amendment or supplemental indenture. However, the failure to give such notice to all the Holders, or any defect in the notice, will not impair or affect the validity of the amendment or supplemental
indenture. 
 Section 10.03.    Effect of Supplemental Indentures. Upon the execution of any amendment or
supplemental indenture pursuant to the provisions of this Article 10, the Notes and/or this Indenture shall be and be deemed to be modified and amended in accordance therewith and the respective rights, limitation of rights, obligations, duties and
immunities under this Indenture of the Trustee, the Company and the Holders shall thereafter be determined, exercised and enforced hereunder subject in all respects to such modifications and amendments and all the terms and conditions of any such
amendment or supplemental indenture shall be and be deemed to be part of the terms and conditions of the Notes and/or this Indenture for any and all purposes. 

Section 10.04.    Notation on Notes. Notes authenticated and delivered after the execution of any amendment or
supplemental indenture pursuant to the provisions of this Article 10 may, at the Company’s expense, bear a notation in form approved by the Trustee as to any matter provided for in such amendment or supplemental indenture. If the Company
or the Trustee shall so determine, new Notes so modified as to conform, in the opinion of the Trustee and the Company, to any modification of the Notes or this Indenture contained in any such amendment or supplemental indenture may, at the
Company’s expense, be prepared and executed by the Company, authenticated by the Trustee (or an authenticating agent duly appointed by the Trustee pursuant to Section 17.10) and delivered in exchange for the Notes then outstanding, upon
surrender of such Notes then outstanding. 
 Section 10.05.    Evidence of Compliance of Supplemental Indenture
to Be Furnished Trustee. In addition to the documents required by Section 17.05, the Trustee shall receive an Officer’s Certificate and an Opinion of Counsel as conclusive evidence that any amendment or supplemental indenture executed
pursuant hereto complies with the requirements of this Article 10 and is permitted or authorized by this Indenture. 
 Article
11.    Consolidation, Merger, Sale, Conveyance and Lease 
 Section 11.01.    Company May
Consolidate, Etc. on Certain Terms. Subject to the provisions of Section 11.02, the Company shall not consolidate with, merge with or into, or sell, convey, transfer or lease all or substantially all of its properties and assets of the
Company and its Subsidiaries, taken as a whole (a “Business Combination Event”), (provided, however, that for the avoidance of doubt, a Business Combination Event shall exclude, and this Article 11 shall not apply to, any
sale-leaseback transaction entered into by Aspen Aerogels Georgia, LLC, or its successors or assigns, for the purpose of tax abatement), to another Person, unless: 

  
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 a.    the resulting, surviving or transferee Person either (x) is
the Company or (y) if not the Company, is a corporation (the “Successor Corporation”) duly organized and existing under the laws of the United States of America, any State thereof or the District of Columbia that expressly
assumes (by executing and delivering to the Trustee, at or before the effective time of such Business Combination Event, a supplemental indenture or amendment to the Notes, as the case may be (for purposes of this Article 11, a “supplemental
indenture”), pursuant to Section 11.02) all of the Company’s obligations under this Indenture and the Notes; and 

b.    immediately after giving effect to such transaction, no Default or Event of Default shall have occurred and be
continuing under this Indenture. 
 Section 11.02.    Successor Corporation to Be Substituted. In case of
any such consolidation, merger, sale, conveyance, transfer or lease and upon the assumption by the Successor Corporation, by supplemental indenture, executed and delivered to the Trustee and satisfactory in form to the Trustee, of the due and
punctual payment of the principal of and accrued and unpaid interest on all of the Notes, the due and punctual delivery or payment, as the case may be, of any consideration due upon conversion of the Notes and the due and punctual performance of all
of the covenants and conditions of this Indenture to be performed by the Company, such Successor Corporation (if not the Company) shall succeed to and, except in the case of a lease of all or substantially all of the Company’s properties and
assets, shall be substituted for the Company, with the same effect as if it had been named herein as the party of the first part. Such Successor Corporation thereupon may cause to be signed, and may issue either in its own name or in the name of the
Company any or all of the Notes issuable hereunder which theretofore shall not have been signed by the Company and delivered to the Trustee; and, upon the order of such Successor Corporation instead of the Company and subject to all the terms,
conditions and limitations in this Indenture prescribed, the Trustee shall authenticate and shall deliver, or cause to be authenticated and delivered, any Notes that previously shall have been signed and delivered by the Officers of the Company to
the Trustee for authentication, and any Notes that such Successor Corporation thereafter shall cause to be signed and delivered to the Trustee for that purpose. All the Notes so issued shall in all respects have the same legal rank and benefit under
this Indenture as the Notes theretofore or thereafter issued in accordance with the terms of this Indenture as though all of such Notes had been issued at the date of the execution hereof. In the event of any such consolidation, merger, sale,
conveyance or transfer (but not in the case of a lease), upon compliance with this Article 11 the Person named as the “Company” in the first paragraph of this Indenture (or any successor that shall thereafter have become such in the manner
prescribed in this Article 11) may be dissolved, wound up and liquidated at any time thereafter and, except in the case of a lease, such Person shall be released from its liabilities as obligor and maker of the Notes and from its obligations under
this Indenture and the Notes. 
 In case of any such consolidation, merger, sale, conveyance, transfer or lease, such changes in phraseology
and form (but not in substance) may be made in the Notes thereafter to be issued as may be appropriate. 

  
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 Section 11.03.    Delivery of Officer’s
Certificate and Opinion of Counsel to the Trustee. Before the effective time of any Business Combination Event, if at such time there is a Trustee, the Company shall deliver to the Trustee an Officer’s Certificate and Opinion of Counsel,
each stating that (i) such Business Combination Event (and, if applicable, the related supplemental indenture) complies with Section 11.01 and Section 11.02; and (ii) all conditions precedent to such Business Combination Event
provided in this Indenture, if any, have been satisfied. 
 Article 12.    Immunity of Incorporators, Stockholders,
Officers and Directors 
 Section 12.01.    Indenture and Notes Solely Corporate Obligations. No recourse
for the payment of the principal of or accrued and unpaid interest on any Note, nor for any claim based thereon or otherwise in respect thereof, and no recourse under or upon any obligation, covenant or agreement of the Company in this Indenture or
in any supplemental indenture or in any Note, nor because of the creation of any indebtedness represented thereby, shall be had against any incorporator, stockholder, employee, agent, Officer or director or Subsidiary, as such, past, present or
future, of the Company or of any successor corporation, either directly or through the Company or any successor corporation, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or
otherwise; it being expressly understood that all such liability is hereby expressly waived and released as a condition of, and as a consideration for, the execution of this Indenture and the issue of the Notes. 

Article 13.    Company’s Right to Conversion of Notes. 

Section 13.01.    Conversion Right. Subject to and upon compliance with the provisions of this Article 13, the
Company shall have the right, at its option at any time and from time to time, to convert all or any portion (if the portion to be converted is $1,000 Capitalized Principal Amount or any integral multiple of $1.00 in excess thereof) of the Notes
(such amount selected for conversion hereunder, the “Conversion Amount”) prior to the close of business on the Business Day immediately preceding the Maturity Date (such date the “Company Conversion Date”), in each
case, at an initial conversion rate of 28.623257 shares of Common Stock (subject to adjustment as provided in Article 14, the “Conversion Rate”) per $1,000 Capitalized Principal Amount of Notes, if the Last Reported Sale Price of
the Common Stock has been at least 130% of the Conversion Price then in effect for at least 20 consecutive Trading Days (the “Mandatory Conversion Measurement Period”) (subject to, and in accordance with, the settlement provisions
of Section 14.02, the “Conversion Right”), by delivering a written notice to the Holders (the “Mandatory Conversion Notice”), provided, however, that in the event the Company exercises the Conversion Right, the
Company shall include the Make-Whole Amount relative to the Capitalized Principal Amount being converted in the Conversion Amount. The Mandatory Conversion Notice which notice must be delivered on or prior to the tenth Trading Day following the last
Trading Day of the Mandatory Conversion Measurement Period. The Mandatory Conversion Notice shall set forth (i) the Conversion Amount, (ii) detailed calculations of the accrued and unpaid Interest included in the Conversion Amount as of
the Company Conversion Date, and (iii) the Make-Whole Amount included in the Conversion Amount, if any, and (iv) the detailed calculation of the number of shares of Common Stock required to be delivered in respect of such Mandatory
Conversion Notice. 

  
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 Section 13.02.    Mechanics of Conversion. 

a.    Subject to this Section 13.02 and Section 14.06, upon conversion of any Note pursuant to
Section 13.01, the Company shall pay or deliver, as the case may be, to the Holder whose Notes are being converted, in respect of each $1,000 Conversion Amount, cash (“Company Conversion Cash Settlement”), shares
of Common Stock, together with cash, if applicable, in lieu of delivering any fractional share of Common Stock in accordance with subsection (j) of this Section 13.02 (“Company Conversion Physical
Settlement”) or a combination of cash and shares of Common Stock, together with cash, if applicable, in lieu of delivering any fractional share of Common Stock in accordance with subsection (j) of this Section 13.02
(“Company Conversion Combination Settlement”), at its election, as set forth in this Section 13.02. 

i.    All conversions for which the relevant Company Conversion Date occurs after the Company’s
issuance of a Redemption Notice with respect to the Notes and prior to the related Redemption Date, and all conversions for which the relevant Company Conversion Date occurs on or after the Cut-off Date, shall
be settled using the same Company Conversion Settlement Method. 
 ii.    Except for any conversions for
which the relevant Company Conversion Date occurs after the Company’s issuance of a Redemption Notice with respect to the Notes but prior to the related Redemption Date, and any conversions for which the relevant Company Conversion Date occurs
on or after the Cut-off Date, the Company shall use the same Settlement Method for all conversions with the same Company Conversion Date, but the Company shall not have any obligation to use the same Company
Conversion Settlement Method with respect to conversions with different Company Conversion Dates. 

iii.    If, in respect of any Company Conversion Date (or one of the periods described in the third
immediately succeeding set of parentheses, as the case may be), the Company elects to deliver a notice (the “Company Conversion Settlement Notice”) of the relevant Company Conversion Settlement Method in respect of such
Company Conversion Date (or such period, as the case may be), the Company, through the Trustee, shall deliver such Company Conversion Settlement Notice to Holders whose Notes are being converted no later than the close of business on the second
Trading Day immediately following the relevant Company Conversion Date (or, in the case of any conversions for which the relevant Company Conversion Date occurs (x) after the date of issuance of a Redemption Notice with respect to the Notes and
prior to the related Redemption Date, in such Redemption Notice or (y) on or after the Cut-off Date, no later than the Cut-off Date). If the Company does not elect
a Company Conversion Settlement Method prior to the deadline set forth in the immediately preceding sentence, the Company shall no longer have the right to elect a Company Conversion Settlement Method with respect to any conversion on such Company
Conversion Date or during such period, and the Company shall be deemed to have elected the Company Conversion Default Settlement Method with respect to such conversion. Such Company Conversion Settlement Notice shall specify the relevant Company
Conversion Settlement Method and in the case of an election of Company Conversion Combination Settlement, the relevant Company Conversion Settlement Notice shall indicate the Company Conversion Specified Dollar Amount per $1,000 Conversion Amount of
Notes. If the Company 

  
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delivers a Company Conversion Settlement Notice electing Company Conversion Combination Settlement (or is deemed to have elected Company Conversion Combination Settlement) in respect of its
Company Conversion Obligation but does not indicate a Company Conversion Specified Dollar Amount per $1,000 Conversion Amount of Notes in such Company Conversion Settlement Notice, the Company Conversion Specified Dollar Amount per $1,000 Conversion
Amount of Notes shall be deemed to be $1,000. For the avoidance of doubt, the Company’s failure to timely elect a Company Conversion Settlement Method or specify as applicable a Company Conversion Specified Dollar Amount shall not constitute a
Default under this Indenture. 
 By notice to Holders, the Trustee and the Conversion Agent (if other than the Trustee), the Company may, from time to time,
change the Company Conversion Default Settlement Method. By notice to all Holders, the Company may, at its option, irrevocably elect to satisfy its Conversion Right with respect to the Notes through any Company Conversion Settlement Method that the
Company is then permitted to elect, including Company Conversion Combination Settlement with a Company Conversion Specified Dollar Amount per $1,000 Conversion Amount of Notes of $1,000 or with an ability to continue to set the Company Conversion
Specified Dollar Amount per $1,000 Conversion Amount of Notes at or above a specific amount set forth in such election notice. If the Company changes the Company Conversion Default Settlement Method or the Company irrevocably elects to fix the
Company Conversion Settlement Method, in either case, to Company Conversion Combination Settlement with an ability to continue to set the Company Conversion Specified Dollar Amount per $1,000 Conversion Amount of Notes at or above a specific amount,
the Company will, after the date of such change or election, as the case may be, inform Holders whose Notes are being converted through the Trustee of such Company Conversion Specified Dollar Amount no later than the relevant deadline for election
of a specified Company Conversion Settlement Method as set forth in the immediately preceding paragraph, or, if the Company does not timely notify Holders, such Company Conversion Specified Dollar Amount will be the specific amount set forth in the
election notice or, if no specific amount was set forth in the election notice, such Company Conversion Specified Dollar Amount will be $1,000 per $1,000 Conversion Amount of Notes. A change in the Company Conversion Default Settlement Method or an
irrevocable election shall apply for all conversions of Notes with Company Conversion Dates occurring subsequent to delivery of such notice; provided that no such change or election will affect any Company Conversion Settlement Method theretofore
elected (or deemed to be elected) with respect to any Note. For the avoidance of doubt, such an irrevocable election, if made by the Company, will be effective without the need to amend this Indenture or the Notes, including pursuant to
Section 10.01(k). However, the Company may nonetheless choose to execute such an amendment at its option. 

iv.    The cash, shares of Common Stock or combination of cash and shares of Common Stock in respect of any
conversion of Notes (the “Company Conversion Settlement Amount”) shall be computed as follows: 
 1.
if the Company elects (or is deemed to have elected) to satisfy its Conversion Right in respect of such conversion by Company Conversion Physical Settlement, the Company shall deliver to the converting Holder in respect of each $1,000 Conversion
Amount of Notes being converted a number of shares of Common Stock equal to the Conversion Rate in effect on the Company Conversion Date; 

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

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

vi.    Notwithstanding anything to the contrary in the Notes or this Indenture, to the extent that Company
Conversion Physical Settlement or Company Conversion Combination Settlement would require the Company or any Holder to obtain any regulatory approvals or consents from or pursuant to the rules of, or make any filing with, any Governmental Entity,
then the Company, on the one hand, and the applicable Holder, on the other hand, shall, at the request of the Company or the Holder, as applicable, (a) as promptly as practicable, make, or cause to be made, all filings and submissions required
under applicable law, and (b) use their commercially reasonable efforts to obtain, or cause to be obtained, approval of the transaction or relevant consent associated with the filing or the termination or expiration of the applicable waiting
period (“Governmental Approval”), and notwithstanding anything to the contrary in the Notes or this Indenture, the right to convert the relevant Notes and the obligation of the Company to deliver (or cause to be delivered) any
related shares of Common Stock upon such conversion shall be contingent upon, and subject to, the receipt of any required Governmental Approval (as determined by the Holder or the Company, as applicable) and any such delivery shall be delayed until
such Governmental Approval is received; provided that, for the avoidance of doubt, any filing or submission fees required under applicable laws shall be paid by such Holder. 

  
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 b.    Subject to Section 13.02(e), before the Company shall be
entitled to convert a Note as set forth above, the Company shall (1) complete, manually sign and deliver an irrevocable notice to the Conversion Agent as set forth in the Form of Notice of Company Conversion (or a facsimile, PDF or other
electronic transmission thereof) (a “Notice of Company Conversion”) at the office of the Conversion Agent and state in writing therein the Conversion Amount to be converted, including the pro rata Make-Whole Amount relative to the
Capitalized Principal Amount being converted in the Conversion Amount. 
 c.    Except as set forth in
Section 13.02(a)(vi), the Company shall pay or deliver, as the case may be, the consideration due in respect of the Conversion Right on the third Business Day immediately following the relevant Company Conversion Date, if the Company elects
Company Conversion Physical Settlement, or on the third Business Day immediately following the last Trading Day of the Company Conversion Observation Period, in the case of any other Company Conversion Settlement Method. If any shares of Common
Stock are due to a Holder whose Notes are being converted, the Company shall issue or cause to be issued, and deliver (if applicable) to such Holder, or such Holder’s nominee or nominees, the full number of shares of Common Stock to which such
Holder shall be entitled, in certificate form or in book-entry format, in satisfaction of the Company’s Conversion Right. 

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

e.    If a Holder submits a Note for conversion, the Company shall pay any documentary, stamp or similar issue or transfer
tax due on the issue of any shares of Common Stock upon conversion, unless the tax is due because the Holder requests such shares to be issued in a name other than the Holder’s name, in which case the Holder shall pay that tax. The Conversion
Agent may refuse to deliver the certificates representing the shares of Common Stock being issued in a name other than the Holder’s name until the Trustee receives a sum sufficient to pay any tax that is due by such Holder in accordance with
the immediately preceding sentence. 
 f.    Except as provided in Section 14.03, no adjustment shall be made for
dividends on any shares of Common Stock issued upon the conversion of any Note as provided in this Article 13. 

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

  
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 h.    Upon conversion, a Holder shall not receive any separate cash
payment for any accrued interest that has not been paid or capitalized. The Company’s settlement of the full Conversion Right shall be deemed to satisfy in full its obligation to pay the Conversion Amount and any accrued interest that has not
been paid or capitalized, to, but not including, the relevant Company Conversion Date. As a result, any accrued interest that has not been paid or capitalized to, but not including, the relevant Company Conversion Date shall be deemed to be paid in
full rather than cancelled, extinguished or forfeited. Upon a conversion of Notes into a combination of cash and shares of Common Stock, accrued interest that has not been paid or capitalized will be deemed to be paid first out of the cash paid upon
such conversion. Notwithstanding the foregoing, if Notes are converted after the close of business on a Regular Record Date, Holders of such Notes as of the close of business on such Regular Record Date will receive the full amount of interest
payable on such Notes in cash at the Cash Interest Rate as if the Company had elected the Cash Method for all such interest (whether or not the Company actually elected the Cash Method) and the principal of such converted Notes shall not be
increased by any Conversion Amount on the corresponding Interest Payment Date notwithstanding the conversion. Notes surrendered for conversion during the period from the close of business on any Regular Record Date to the open of business on the
immediately following Interest Payment Date must be accompanied by funds equal to the amount of such interest payable on the Notes so converted; provided that no such payment shall be required (1) for conversions following the Regular
Record Date immediately preceding the Maturity Date; (2) if the Company has specified a Redemption Date that is after a Regular Record Date and on or prior to the Business Day immediately following the corresponding Interest Payment Date;
(3) if the Company has specified a Fundamental Change Repurchase Date that is after a Regular Record Date and on or prior to the Business Day immediately following the corresponding Interest Payment Date; or (4) to the extent of any
Defaulted Amounts, if any Defaulted Amounts exists at the time of conversion with respect to such Note. Therefore, for the avoidance of doubt, all Holders of record on the Regular Record Date immediately preceding the Maturity Date shall receive the
full interest payment due on the Maturity Date in cash at the Cash Interest Rate as if the Company had elected the Cash Method for all such interest (whether or not the Company actually elected the Cash Method) regardless of whether their Notes have
been converted following such Regular Record Date. 
 i.    Subject to Section 13.02(a)(vi), the Person in whose
name the shares of Common Stock shall be issuable upon conversion shall be treated as a stockholder of record as of the close of business on the relevant Company Conversion Date (if the Company elects to satisfy the related Conversion Right by
Company Conversion Physical Settlement) or the last Trading Day of the relevant Observation Period (if the Company elects to satisfy the related Conversion Right by Company Conversion Combination Settlement), as the case may be. Upon a conversion of
Notes, such Person shall no longer be a Holder of such Notes surrendered for conversion. 
 j.    The Company shall not
issue any fractional share of Common Stock upon conversion of the Notes and shall instead pay cash in lieu of delivering any fractional share of Common Stock issuable upon conversion based on the Daily VWAP for the relevant Company Conversion Date
(in the case of Company Conversion Physical Settlement) or based on the Daily VWAP for the last Trading Day of the relevant Observation Period (in the case of Company Conversion Combination Settlement). For each Note surrendered for conversion, if
the Company has elected Company Conversion Combination Settlement, the full number of shares 

  
 56 












 
that shall be issued upon conversion thereof shall be computed on the basis of the aggregate Daily Settlement Amounts for the relevant Observation Period and any fractional shares remaining after
such computation shall be paid in cash. 
 Article 14.    Holder’s Right to Conversion of Notes 

Section 14.01.    Conversion Privilege. Subject to and upon compliance with the provisions of this Article 14,
each Holder of a Note shall have the right, at such Holder’s option at any time and from time to time, to convert all or any portion (if the portion to be converted is $1,000 Capitalized Principal Amount or any integral multiple of $1.00 in
excess thereof) of such Note prior to the close of business on the Business Day immediately preceding the Maturity Date, in each case, at the Conversion Rate, per $1,000 Capitalized Principal Amount of Notes (subject to, and in accordance with, the
settlement provisions of Section 14.02, the “Conversion Obligation”). 

Section 14.02.    Conversion Procedure; Settlement Upon Conversion. 

a.    Subject to this Section 14.02 and Section 14.06(a), upon conversion of any Note, the Company shall pay or
deliver, as the case may be, to the converting Holder, in respect of each $1,000 Capitalized Principal Amount of Notes being converted, cash (“Cash Settlement”), shares of Common Stock, together with cash, if applicable, in lieu of
delivering any fractional share of Common Stock in accordance with subsection (j) of this Section 14.02 (“Physical Settlement”) or a combination of cash and shares of Common Stock, together with cash, if applicable, in
lieu of delivering any fractional share of Common Stock in accordance with subsection (j) of this Section 14.02 (“Combination Settlement”), at its election, as set forth in this Section 14.02. 

i.    All conversions for which the relevant Conversion Date occurs after the Company’s issuance of a
Redemption Notice with respect to the Notes and prior to the related Redemption Date, and all conversions for which the relevant Conversion Date occurs on or after the Cut-off Date, shall be settled using the
same Settlement Method. 
 ii.    Except for any conversions for which the relevant Conversion Date
occurs after the Company’s issuance of a Redemption Notice with respect to the Notes but prior to the related Redemption Date, and any conversions for which the relevant Conversion Date occurs on or after the
Cut-off Date, the Company shall use the same Settlement Method for all conversions with the same Conversion Date, but the Company shall not have any obligation to use the same Settlement Method with respect to
conversions with different Conversion Dates. 
 iii.    If, in respect of any Conversion Date (or one of
the periods described in the third immediately succeeding set of parentheses, as the case may be), the Company elects to deliver a notice (the “Settlement Notice”) of the relevant Settlement Method in respect of such Conversion Date
(or such period, as the case may be), the Company, through the Trustee, shall deliver such Settlement Notice to converting Holders no later than the close of business on the second Trading Day immediately following the relevant Conversion Date (or,
in the case of any conversions for which the relevant Conversion 

  
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Date occurs (x) after the date of issuance of a Redemption Notice with respect to the Notes and prior to the related Redemption Date, in such Redemption Notice or (y) on or after the Cut-off Date, no later than the Cut-off Date). If the Company does not elect a Settlement Method prior to the deadline set forth in the immediately preceding sentence, the
Company shall no longer have the right to elect a Settlement Method with respect to any conversion on such Conversion Date or during such period, and the Company shall be deemed to have elected the Default Settlement Method with respect to such
conversion. Such Settlement Notice shall specify the relevant Settlement Method and in the case of an election of Combination Settlement, the relevant Settlement Notice shall indicate the Specified Dollar Amount per $1,000 Capitalized Principal
Amount of Notes. If the Company delivers a Settlement Notice electing Combination Settlement (or is deemed to have elected Combination Settlement) in respect of its Conversion Obligation but does not indicate a Specified Dollar Amount per $1,000
Capitalized Principal Amount of Notes in such Settlement Notice, the Specified Dollar Amount per $1,000 Capitalized Principal Amount of Notes shall be deemed to be $1,000. For the avoidance of doubt, the Company’s failure to timely elect a
Settlement Method or specify as applicable a Specified Dollar Amount shall not constitute a Default under this Indenture. 
 By notice to Holders, the
Trustee and the Conversion Agent (if other than the Trustee), the Company may, from time to time, change the Default Settlement Method. By notice to all Holders, the Company may, at its option, irrevocably elect to satisfy its Conversion Obligation
with respect to the Notes through any Settlement Method that the Company is then permitted to elect, including Combination Settlement with a Specified Dollar Amount per $1,000 Capitalized Principal Amount of Notes of $1,000 or with an ability to
continue to set the Specified Dollar Amount per $1,000 Capitalized Principal Amount of Notes at or above a specific amount set forth in such election notice. If the Company changes the Default Settlement Method or the Company irrevocably elects to
fix the Settlement Method, in either case, to Combination Settlement with an ability to continue to set the Specified Dollar Amount per $1,000 Capitalized Principal Amount of Notes at or above a specific amount, the Company will, after the date of
such change or election, as the case may be, inform Holders converting their Notes through the Trustee of such Specified Dollar Amount no later than the relevant deadline for election of a specified Settlement Method as set forth in the immediately
preceding paragraph, or, if the Company does not timely notify Holders, such Specified Dollar Amount will be the specific amount set forth in the election notice or, if no specific amount was set forth in the election notice, such Specified Dollar
Amount will be $1,000 per $1,000 Capitalized Principal Amount of Notes. A change in the Default Settlement Method or an irrevocable election shall apply for all conversions of Notes with Conversion Dates occurring subsequent to delivery of such
notice; provided that no such change or election will affect any Settlement Method theretofore elected (or deemed to be elected) with respect to any Note. For the avoidance of doubt, such an irrevocable election, if made by the Company, will be
effective without the need to amend this Indenture or the Notes, including pursuant to Section 10.01(k). However, the Company may nonetheless choose to execute such an amendment at its option. 

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

  
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 1. if the Company elects (or is deemed to have elected) to satisfy its
Conversion Obligation in respect of such conversion by Physical Settlement, the Company shall deliver to the converting Holder in respect of each $1,000 Capitalized Principal Amount of Notes being converted a number of shares of Common Stock equal
to the Conversion Rate in effect on the Conversion Date; 
 a. if the Company elects (or is deemed to have elected) to
satisfy its Conversion Obligation in respect of such conversion by Cash Settlement, the Company shall pay to the converting Holder in respect of each $1,000 Capitalized Principal Amount of Notes being converted cash in an amount equal to the sum of
the Daily Conversion Values for each of the 40 consecutive Trading Days during the related Observation Period; and 
 b. if
the Company elects (or is deemed to have elected) to satisfy its Conversion Obligation in respect of such conversion by Combination Settlement, the Company shall pay or deliver, as the case may be, in respect of each $1,000 Capitalized Principal
Amount of Notes being converted, a Settlement Amount equal to the sum of the Daily Settlement Amounts for each of the 40 consecutive Trading Days during the related Observation Period. 

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

vi.    Notwithstanding anything to the contrary in the Notes or this Indenture, to the extent that Physical
Settlement or Combination Settlement would require the Company or any Holder to obtain any regulatory approvals or consents from or pursuant to the rules of, or make any filing with, any Governmental Entity, then the Company, on the one hand, and
the applicable Holder, on the other hand, shall, at the request of the Company or the Holder, as applicable, (a) as promptly as practicable, make, or cause to be made, all filings and submissions required under applicable law, and (b) use
their commercially reasonable efforts to obtain, or cause to be obtained, Governmental Approval, and notwithstanding anything to the contrary in the Notes or this Indenture, the right to convert the relevant Notes and the obligation of the Company
to deliver (or cause to be delivered) any related shares of Common Stock upon such conversion shall be contingent upon, and subject to, the receipt of any required Governmental Approval (as determined by the Holder or the Company, as applicable) and
any such delivery shall be delayed until such Governmental Approval is received; provided that, for the avoidance of doubt, any filing or submission fees required under applicable laws shall be paid by such Holder. 

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

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

c.    A Note shall be deemed to have been converted immediately prior to the close of business on the date (the
“Conversion Date”) that the Holder has complied with the requirements set forth in subsection (b) above. Except as set forth in Section 14.06(a) and Section 14.02(a)(vi), the Company shall pay or deliver, as the case
may be, the consideration due in respect of the Conversion Obligation on the third Business Day immediately following the relevant Conversion Date, if the Company elects Physical Settlement, or on the third Business Day immediately following the
last Trading Day of the Observation Period, in the case of any other Settlement Method. If any shares of Common Stock are due to a converting Holder, the Company shall issue or cause to be issued, and deliver (if applicable) to the converting
Holder, or such Holder’s nominee or nominees, the full number of shares of Common Stock to which such Holder shall be entitled, in certificate form or in book-entry format, in satisfaction of the Company’s Conversion Obligation. 

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

  
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 e.    If a Holder submits a Note for conversion, the Company shall pay
any documentary, stamp or similar issue or transfer tax due on the issue of any shares of Common Stock upon conversion, unless the tax is due because the Holder requests such shares to be issued in a name other than the Holder’s name, in which
case the Holder shall pay that tax. The Conversion Agent may refuse to deliver the certificates representing the shares of Common Stock being issued in a name other than the Holder’s name until the Trustee receives a sum sufficient to pay any
tax that is due by such Holder in accordance with the immediately preceding sentence. 
 f.    Except as provided in
Section 14.03, no adjustment shall be made for dividends on any shares of Common Stock issued upon the conversion of any Note as provided in this Article 14. 

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

h.    Upon conversion, a Holder shall not receive any separate cash payment for any accrued interest that has not been
paid or capitalized except as set forth below. The Company’s settlement of the full Conversion Obligation shall be deemed to satisfy in full its obligation to pay the Capitalized Principal Amount of the Note and any accrued interest that has
not been paid or capitalized, to, but not including, the relevant Conversion Date. As a result, any accrued interest that has not been paid or capitalized to, but not including, the relevant Conversion Date shall be deemed to be paid in full rather
than cancelled, extinguished or forfeited. Upon a conversion of Notes into a combination of cash and shares of Common Stock, accrued interest that has not been paid or capitalized will be deemed to be paid first out of the cash paid upon such
conversion. Notwithstanding the foregoing, if Notes are converted after the close of business on a Regular Record Date, Holders of such Notes as of the close of business on such Regular Record Date will receive the full amount of interest payable on
such Notes in cash at the Cash Interest Rate as if the Company had elected the Cash Method for all such interest (whether or not the Company actually elected the Cash Method) and the principal of such converted Notes shall not be increased by any
Capitalization Amount (regardless of whether the Company elected or is deemed to have elected the Capitalization Method) on the corresponding Interest Payment Date notwithstanding the conversion. Notes surrendered for conversion during the period
from the close of business on any Regular Record Date to the open of business on the immediately following Interest Payment Date must be accompanied by funds equal to the amount of such interest payable on the Notes so converted; provided
that no such payment shall be required (1) for conversions following the Regular Record Date immediately preceding the Maturity Date; (2) if the Company has specified a Redemption Date that is after a Regular Record Date and on or prior to
the Business Day immediately following the corresponding Interest Payment Date; (3) if the Company has specified a Fundamental Change Repurchase Date that is after a Regular Record Date and on or prior to the Business Day immediately following
the corresponding Interest Payment Date; or (4) to the extent of any Defaulted Amounts, if any Defaulted Amounts 

  
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exists at the time of conversion with respect to such Note. Therefore, for the avoidance of doubt, all Holders of record on the Regular Record Date immediately preceding the Maturity Date shall
receive the full interest payment due on the Maturity Date in cash at the Cash Interest Rate as if the Company had elected the Cash Method for all such interest (whether or not the Company actually elected the Cash Method) regardless of whether
their Notes have been converted following such Regular Record Date. 
 i.    Subject to Section 14.02(a)(vi), the
Person in whose name the shares of Common Stock shall be issuable upon conversion shall be treated as a stockholder of record as of the close of business on the relevant Conversion Date (if the Company elects to satisfy the related Conversion
Obligation by Physical Settlement) or the last Trading Day of the relevant Observation Period (if the Company elects to satisfy the related Conversion Obligation by Combination Settlement), as the case may be. Upon a conversion of Notes, such Person
shall no longer be a Holder of such Notes surrendered for conversion. 
 j.    The Company shall not issue any
fractional share of Common Stock upon conversion of the Notes and shall instead pay cash in lieu of delivering any fractional share of Common Stock issuable upon conversion based on the Daily VWAP for the relevant Conversion Date (in the case of
Physical Settlement) or based on the Daily VWAP for the last Trading Day of the relevant Observation Period (in the case of Combination Settlement). For each Note surrendered for conversion, if the Company has elected Combination Settlement, the
full number of shares that shall be issued upon conversion thereof shall be computed on the basis of the aggregate Daily Settlement Amounts for the relevant Observation Period and any fractional shares remaining after such computation shall be paid
in cash. 
 Section 14.03.    Adjustment of Conversion Rate. The Conversion Rate shall be adjusted from time
to time by the Company if any of the following events occurs, except that the Company shall not make any adjustments to the Conversion Rate if Holders of the Notes participate (other than in the case of (x) a share split or share combination or
(y) a tender or exchange offer), at the same time and upon the same terms as holders of the Common Stock and solely as a result of holding the Notes, in any of the transactions described in this Section 14.03, without having to convert
their Notes, as if they held a number of shares of Common Stock equal to the Conversion Rate for each $1,000 Capitalized Principal Amount of Notes held by such Holder. 

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





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

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

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

 Any adjustment made under this Section 14.03(a) shall become effective immediately after the open of business on the
Ex-Dividend Date for such dividend or distribution, or immediately after the open of business on the Effective Date for such share split or share combination, as applicable. If any dividend or distribution of
the type described in this Section 14.03(a) is declared but not so paid or made, the Conversion Rate shall be immediately readjusted, effective as of the date the Board of Directors determines not to pay such dividend or distribution, to the
Conversion Rate that would then be in effect if such dividend or distribution had not been declared. 
 b.    If the
Company issues to all or substantially all holders of the Common Stock any rights, options or warrants (other than in connection with a stockholder rights plan) entitling them, for a period of not more than 60 calendar days after the announcement
date of such issuance, to subscribe for or purchase shares of the Common Stock at a price per share that is less than the average of the Last Reported Sale Prices of the Common Stock for the 10 consecutive Trading Day period ending on, and
including, the Trading Day immediately preceding the date of announcement of such issuance, the Conversion Rate shall be increased based on the following formula: 
  





 
 where, 
  

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


  

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


  

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


  

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




  
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 Y    = the number of shares of Common Stock equal to the aggregate price payable to exercise
such rights, options or warrants, divided by the average of the Last Reported Sale Prices of the Common Stock over the 10 consecutive Trading Day period ending on, and including, the Trading Day immediately preceding the date of
announcement of the issuance of such rights, options or warrants. 
 Any increase made under this Section 14.03(b) shall be made successively whenever
any such rights, options or warrants are issued and shall become effective immediately after the open of business on the Ex-Dividend Date for such issuance. To the extent that shares of the Common Stock are
not delivered after the expiration of such rights, options or warrants, the Conversion Rate shall be decreased to the Conversion Rate that would then be in effect had the increase with respect to the issuance of such rights, options or warrants been
made on the basis of delivery of only the number of shares of Common Stock actually delivered. If such rights, options or warrants are not so issued, the Conversion Rate shall be decreased to the Conversion Rate that would then be in effect if such Ex-Dividend Date for such issuance had not occurred. 
 For purposes of this Section 14.03(b), in determining whether
any rights, options or warrants entitle the holders to subscribe for or purchase shares of the Common Stock at less than such average of the Last Reported Sale Prices of the Common Stock for the 10 consecutive Trading Day period ending on, and
including, the Trading Day immediately preceding the date of announcement for such issuance, and in determining the aggregate offering price of such shares of Common Stock, there shall be taken into account any consideration received by the Company
for such rights, options or warrants and any amount payable on exercise or conversion thereof, the value of such consideration, if other than cash, to be determined by the Company. 

c.    If the Company distributes shares of its Capital Stock, evidences of its indebtedness, other assets or property of
the Company or rights, options or warrants to acquire its Capital Stock or other securities, to all or substantially all holders of the Common Stock, excluding dividends, distributions or issuances as to which an adjustment was effected pursuant to
Section 14.03(a) or Section 14.03(b), except as otherwise provided in Section 14.09, rights issued pursuant to any stockholder rights plan of the Company then in effect, distributions of Reference Property in exchange for, or upon
conversion of, Common Stock in a Merger Event, dividends or distributions paid exclusively in cash as to which the provisions set forth in Section 14.03(d) shall apply, and Spin-Offs as to which the provisions set forth below in this
Section 14.03(c) shall apply (any of such shares of Capital Stock, evidences of indebtedness, other assets or property or rights, options or warrants to acquire Capital Stock or other securities, the “Distributed Property”),
then the Conversion Rate shall be increased based on the following formula: 
  
 



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

  
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 CR’ = the Conversion Rate in effect immediately after the open of business on such Ex-Dividend Date; 
 SP0 = the average of the Last Reported Sale
Prices of the Common Stock over the 10 consecutive Trading Day period ending on, and including, the Trading Day immediately preceding the Ex-Dividend Date for such distribution; and 

FMV = the fair market value (as determined by the Company) of the Distributed Property with respect to each outstanding share of the Common Stock on the Ex-Dividend Date for such distribution. 
 Any increase made under the portion of this
Section 14.03(c) above shall become effective immediately after the open of business on the Ex-Dividend Date for such distribution. If such distribution is not so paid or made, the Conversion Rate shall
be decreased to the Conversion Rate that would then be in effect if such distribution had not been declared. Notwithstanding the foregoing, if “FMV” (as defined above) is equal to or greater than “SP0” (as defined above), in lieu of the foregoing increase, each Holder of a Note shall receive, in respect of each $1,000 Capitalized Principal Amount thereof, at the same time and upon the same
terms as holders of the Common Stock receive the Distributed Property, the amount and kind of Distributed Property such Holder would have received if such Holder owned a number of shares of Common Stock equal to the Conversion Rate in effect on the Ex-Dividend Date for the distribution. If the Company determines the “FMV” (as defined above) of any distribution for purposes of this Section 14.03(c) by reference to the actual or when-issued
trading market for any securities, it shall in doing so consider the prices in such market over the same period used in computing the Last Reported Sale Prices of the Common Stock over the 10 consecutive Trading Day period ending on, and including,
the Trading Day immediately preceding the Ex-Dividend Date for such distribution. 
 With respect to
an adjustment pursuant to this Section 14.03(c) where there has been a payment of a dividend or other distribution on the Common Stock of shares of Capital Stock of any class or series, or similar equity interest, of or relating to a Subsidiary
or other business unit of the Company, that are, or, when issued, will be, listed or admitted for trading on a U.S. national securities exchange (a “Spin-Off”), the Conversion Rate shall be
increased based on the following formula: 
 where, 
 CR0 = the Conversion Rate in effect immediately prior to the end of the Valuation Period; 
 CR’ = the
Conversion Rate in effect immediately after the end of the Valuation Period; 
 FMV0 = the average
of the Last Reported Sale Prices of the Capital Stock or similar equity interest distributed to holders of the Common Stock applicable to one share of the Common Stock (determined by reference to the definition of Last Reported Sale Price as set
forth in Section 1.01 as if references therein to Common Stock were to such Capital Stock or similar equity interest) over the first 10 consecutive Trading Day period after, and including, the Ex-Dividend
Date of the Spin-Off (the “Valuation Period”); and 

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

The increase to the Conversion Rate under the preceding paragraph shall occur at the close of business on the last Trading Day of the
Valuation Period; provided that (x) in respect of any conversion of Notes for which Physical Settlement is applicable, if the relevant Conversion Date occurs during the Valuation Period, references to “10” in the preceding
paragraph shall be deemed to be replaced with such lesser number of Trading Days as have elapsed from, and including, the Ex-Dividend Date of such Spin-Off to, and
including, the Conversion Date in determining the Conversion Rate and (y) in respect of any conversion of Notes for which Cash Settlement or Combination Settlement is applicable, for any Trading Day that falls within the relevant Observation
Period for such conversion and within the Valuation Period, references to “10” in the preceding paragraph shall be deemed to be replaced with such lesser number of Trading Days as have elapsed from, and including, the Ex-Dividend Date of such Spin-Off to, and including, such Trading Day in determining the Conversion Rate as of such Trading Day. 

For purposes of this Section 14.03(c) (and subject in all respect to Section 14.09), rights, options or warrants distributed by the
Company to all holders of the Common Stock entitling them to subscribe for or purchase shares of the Company’s Capital Stock, including Common Stock (either initially or under certain circumstances), which rights, options or warrants, until the
occurrence of a specified event or events (“Trigger Event”): (i) are deemed to be transferred with such shares of the Common Stock; (ii) are not exercisable; and (iii) are also issued in respect of future issuances of the
Common Stock, shall be deemed not to have been distributed for purposes of this Section 14.03(c) (and no adjustment to the Conversion Rate under this Section 14.03(c) will be required) until the occurrence of the earliest Trigger Event,
whereupon such rights, options or warrants shall be deemed to have been distributed and an appropriate adjustment (if any is required) to the Conversion Rate shall be made under this Section 14.03(c). If any such right, option or warrant,
including any such existing rights, options or warrants distributed prior to the date of this Indenture, are subject to events, upon the occurrence of which such rights, options or warrants become exercisable to purchase different securities,
evidences of indebtedness or other assets, then the date of the occurrence of any and each such event shall be deemed to be the date of distribution and Ex-Dividend Date with respect to new rights, options or
warrants with such rights (in which case the existing rights, options or warrants shall be deemed to terminate and expire on such date without exercise by any of the holders thereof). In addition, in the event of any distribution (or deemed
distribution) of rights, options or warrants, or any Trigger Event or other event (of the type described in the immediately preceding sentence) with respect thereto that was counted for purposes of calculating a distribution amount for which an
adjustment to the Conversion Rate under this Section 14.03(c) was made, (1) in the case of any such rights, options or warrants that shall all have been redeemed or purchased without exercise by any holders thereof, upon such final
redemption or purchase (x) the Conversion Rate shall be readjusted as if such rights, options or warrants had not been issued and (y) the Conversion Rate shall then again be readjusted to give effect to such distribution, deemed
distribution or Trigger Event, as the case may be, as though it were a cash distribution, equal to the per share redemption or purchase price received by a holder or holders of Common Stock with respect to such rights, options or warrants (assuming
such holder had retained such rights, options or warrants), made to all holders of Common Stock as of the date of such redemption or purchase, and (2) in the case of such rights, options or warrants that shall have expired or been terminated
without exercise by any holders thereof, the Conversion Rate shall be readjusted as if such rights, options and warrants had not been issued. 

  
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 For purposes of Section 14.03(a), Section 14.03(b) and this Section 14.03(c),
if any dividend or distribution to which this Section 14.03(c) is applicable also includes one or both of: 

(A)    a dividend or distribution of shares of Common Stock to which Section 14.03(a) is applicable (the
“Clause A Distribution”); or 
 (B)    a dividend or distribution of rights, options or warrants to
which Section 14.03(b) is applicable (the “Clause B Distribution”), 
 then, in either case, (1) such dividend or distribution,
other than the Clause A Distribution and the Clause B Distribution, shall be deemed to be a dividend or distribution to which this Section 14.03(c) is applicable (the “Clause C Distribution”) and any Conversion Rate adjustment
required by this Section 14.03(c) with respect to such Clause C Distribution shall then be made, and (2) the Clause A Distribution and Clause B Distribution shall be deemed to immediately follow the Clause C Distribution and any Conversion
Rate adjustment required by Section 14.03(a) and Section 14.03(b) with respect thereto shall then be made, except that, if determined by the Company (I) the “Ex-Dividend Date” of the
Clause A Distribution and the Clause B Distribution shall be deemed to be the Ex-Dividend Date of the Clause C Distribution and (II) any shares of Common Stock included in the Clause A Distribution or
Clause B Distribution shall be deemed not to be “outstanding immediately prior to the open of business on such Ex-Dividend Date or Effective Date” within the meaning of Section 14.03(a) or
“outstanding immediately prior to the open of business on such Ex-Dividend Date” within the meaning of Section 14.03(b). 

d.    If any cash dividend or distribution is made to all or substantially all holders of the Common Stock, the Conversion
Rate shall be adjusted based on the following formula: 
  
 



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

CR’ = the Conversion Rate in effect immediately after the open of business on the Ex-Dividend Date for such
dividend or distribution; 
 SP0 = the Last Reported Sale Price of the Common Stock on the Trading
Day immediately preceding the Ex-Dividend Date for such dividend or distribution; and 
  

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



  
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 Any increase pursuant to this Section 14.03(d) shall become effective immediately after the open of
business on the Ex-Dividend Date for such dividend or distribution. If such dividend or distribution is not so paid, the Conversion Rate shall be decreased, effective as of the date the Board of Directors
determines not to make or pay such dividend or distribution, to be the Conversion Rate that would then be in effect if such dividend or distribution had not been declared. Notwithstanding the foregoing, if “C” (as defined above) is equal
to or greater than “SP0” (as defined above), in lieu of the foregoing increase, each Holder of a Note shall receive, for each $1,000 Capitalized Principal Amount of Notes, at the same
time and upon the same terms as holders of shares of the Common Stock, the amount of cash that such Holder would have received if such Holder owned a number of shares of Common Stock equal to the Conversion Rate on the
Ex-Dividend Date for such cash dividend or distribution. 
 e.    If the Company
or any of its Subsidiaries make a payment in respect of a tender or exchange offer for the Common Stock that is subject to the then applicable tender offer rules under the Exchange Act (other than any odd-lot
tender offer), to the extent that the cash and value of any other consideration included in the payment per share of the Common Stock exceeds the average of the Last Reported Sale Prices of the Common Stock over the 10 consecutive Trading Day period
commencing on, and including, the Trading Day next succeeding the last date on which tenders or exchanges may be made pursuant to such tender or exchange offer, the Conversion Rate shall be increased based on the following formula: 

 
 



 
 where, 
 CR0 = the Conversion Rate in effect immediately prior to the close of business on the 10th Trading Day immediately following, and including, the Trading Day next succeeding the date such tender or
exchange offer expires; 
 CR’ = the Conversion Rate in effect immediately after the close of business on the 10th Trading Day immediately following,
and including, the Trading Day next succeeding the date such tender or exchange offer expires; 
 AC = the aggregate value of all cash and any other
consideration (as determined by the Company) paid or payable for shares of Common Stock purchased in such tender or exchange offer; 
 OS0 = the number of shares of Common Stock outstanding immediately prior to the date such tender or exchange offer expires (prior to giving effect to the purchase of all shares of Common Stock
accepted for purchase or exchange in such tender or exchange offer); 
 OS’ = the number of shares of Common Stock outstanding immediately after the
date such tender or exchange offer expires (after giving effect to the purchase of all shares of Common Stock accepted for purchase or exchange in such tender or exchange offer); and 

  
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 SP’ = the average of the Last Reported Sale Prices of the Common Stock over the 10 consecutive Trading
Day period commencing on, and including, the Trading Day next succeeding the date such tender or exchange offer expires. 
 The increase to the Conversion
Rate under this Section 14.03(e) shall occur at the close of business on the 10th Trading Day immediately following, and including, the Trading Day next succeeding the date such tender or exchange offer expires; provided that (x) in
respect of any conversion of Notes for which Physical Settlement is applicable, if the relevant Conversion Date occurs during the 10 Trading Days immediately following, and including, the Trading Day next succeeding the expiration date of any tender
or exchange offer, references to “10” or “10th” in the preceding paragraph shall be deemed replaced with such lesser number of Trading Days as have elapsed from, and including, the Trading Day next succeeding the date that such
tender or exchange offer expires to, and including, the Conversion Date in determining the Conversion Rate and (y) in respect of any conversion of Notes for which Cash Settlement or Combination Settlement is applicable, for any Trading Day that
falls within the relevant Observation Period for such conversion and within the 10 Trading Days immediately following, and including, the Trading Day next succeeding the expiration date of any tender or exchange offer, references to “10”
or “10th” in the preceding paragraph shall be deemed replaced with such lesser number of Trading Days as have elapsed from, and including, the Trading Day next succeeding the expiration date of such tender or exchange offer to, and
including, such Trading Day in determining the Conversion Rate as of such Trading Day. 
 If the Company or one of its Subsidiaries is
obligated to purchase shares of Common Stock pursuant to any such tender or exchange offer described in this Section 14.03(e) but the Company or such Subsidiary is permanently prevented by applicable law from effecting any such purchase or all
such purchases are rescinded, the Conversion Rate shall be readjusted to be the Conversion Rate that would then be in effect if such tender or exchange offer had not been made or had been made only in respect of the purchases that have been made.

 f.    Notwithstanding this Section 14.03 or any other provision of this Indenture or the Notes, if a Conversion
Rate adjustment becomes effective on any Ex-Dividend Date, and a Holder that has converted its Notes on or after such Ex-Dividend Date and on or prior to the related
Record Date would be treated as the record holder of the shares of Common Stock as of the related Conversion Date as described under Section 14.02(i) based on an adjusted Conversion Rate for such
Ex-Dividend Date, then, notwithstanding the Conversion Rate adjustment provisions in this Section 14.03, the Conversion Rate adjustment relating to such Ex-Dividend
Date shall not be made for such converting Holder. Instead, such Holder shall be treated as if such Holder were the record owner of the shares of Common Stock on an unadjusted basis and participate in the related dividend, distribution or other
event giving rise to such adjustment. 
 g.    Except as stated herein, the Company shall not adjust the Conversion Rate
for the issuance of shares of the Common Stock or any securities convertible into or exchangeable for shares of the Common Stock or the right to purchase shares of the Common Stock or such convertible or exchangeable securities. 

h.    In addition to those adjustments required by clauses (a), (b), (c), (d) and (e) of this Section 14.03, and
to the extent permitted by applicable law and subject to the applicable rules of 

  
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any exchange on which any of the Company’s securities are then listed, the Company from time to time may increase the Conversion Rate by any amount for a period of at least 20 Business Days
if the Company determines that such increase would be in the Company’s best interest. In addition, to the extent permitted by applicable law and subject to the applicable rules of any exchange on which any of the Company’s securities are
then listed, the Company may (but is not required to) increase the Conversion Rate to avoid or diminish any income tax to holders of Common Stock or rights to purchase Common Stock in connection with a dividend or distribution of shares of Common
Stock (or rights to acquire shares of Common Stock) or similar event. Whenever the Conversion Rate is increased pursuant to either of the preceding two sentences, the Company shall deliver to the Holder of each Note a notice of the increase at least
15 days prior to the date the increased Conversion Rate takes effect, and such notice shall state the increased Conversion Rate and the period during which it will be in effect. 

i.    Notwithstanding anything to the contrary in this Article 14, the Conversion Rate shall not be adjusted: 

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

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

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

iv.    for a third-party tender offer by any party other than a tender offer by one or more of the
Company’s Subsidiaries as described in clause (e) of this Section 14.03; 
 v.    upon the
repurchase of any shares of Common Stock pursuant to an open market share purchase program or other buy-back transaction, including structured or derivative transactions such as accelerated share repurchase
transactions or similar forward derivatives, or other buy-back transaction, that is not a tender offer or exchange offer of the kind described under clause (e) of this Section 14.03; 

vi.    solely for a change in the par value of the Common Stock; or 

vii.    for accrued and unpaid interest, if any. 

j.    All calculations and other determinations under this Article 14 shall be made by the Company and shall be made to
the nearest one-ten thousandth (1/10,000th) of a share. 
 k.    If an
adjustment to the Conversion Rate otherwise required by this Section 14.03 would result in a change of less than 1% to the Conversion Rate, then, notwithstanding the 

  
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foregoing, the Company may, at its election, defer and carry forward such adjustment, except that all such deferred adjustments must be given effect immediately upon the earliest to occur of the
following: (i) when all such deferred adjustments would result in an aggregate change of at least 1% to the Conversion Rate, (ii) on the Conversion Date for any Notes (in the case of Physical Settlement), (iii) on each Trading Day of any
Observation Period related to any conversion of Notes (in the case of Cash Settlement or Combination Settlement), (iv) the Cut-off Date, (v) on any date on which the Company delivers a Redemption Notice
and (vi) on the effective date of any Fundamental Change, in each case, unless the adjustment has already been made. 

l.    Whenever the Conversion Rate is adjusted as herein provided, the Company shall promptly file with the Trustee (and
the Conversion Agent if not the Trustee) an Officer’s Certificate setting forth the Conversion Rate after such adjustment and setting forth a brief statement of the facts requiring such adjustment. Unless and until a Responsible Officer of the
Trustee shall have received such Officer’s Certificate, the Trustee shall not be deemed to have knowledge of any adjustment of the Conversion Rate and may assume without inquiry that the last Conversion Rate of which it has knowledge is still
in effect. Promptly after delivery of such certificate, the Company shall prepare a notice of such adjustment of the Conversion Rate setting forth the adjusted Conversion Rate and the date on which each adjustment becomes effective and shall deliver
such notice of such adjustment of the Conversion Rate to each Holder. Failure to deliver such notice shall not affect the legality or validity of any such adjustment. 

m.    For purposes of this Section 14.03, the number of shares of Common Stock at any time outstanding shall not
include shares of Common Stock held in the treasury of the Company so long as the Company does not pay any dividend or make any distribution on shares of Common Stock held in the treasury of the Company, but shall include shares of Common Stock
issuable in respect of scrip certificates issued in lieu of fractions of shares of Common Stock. 

Section 14.04.    Adjustments of Prices. Whenever any provision of this Indenture requires the Company to
calculate the Last Reported Sale Prices, the Daily VWAPs, the Daily Conversion Values or the Daily Settlement Amounts over a span of multiple days (including, without limitation, an Observation Period), the Company shall make any adjustments to each
that the Company reasonably determines to be appropriate to account for any adjustment to the Conversion Rate that becomes effective, or any event requiring an adjustment to the Conversion Rate where the Record Date,
Ex-Dividend Date, Effective Date or expiration date, as the case may be, of the event occurs, at any time during the period when the Last Reported Sale Prices, the Daily VWAPs, the Daily Conversion Values or
the Daily Settlement Amounts are to be calculated. 
 Section 14.05.    Shares to Be Fully Paid. The Company
shall provide, free from preemptive rights, out of its authorized but unissued shares or shares held in treasury, sufficient shares of Common Stock to provide for conversion of the Notes from time to time as such Notes are presented for conversion
(assuming that at the time of computation of such number of shares, all such Notes would be converted by a single Holder and that Physical Settlement were applicable). 

  
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 Section 14.06.    Effect of Recapitalizations, Reclassifications
and Changes of the Common Stock. 
 a.    In the case of: 

i.    any recapitalization, reclassification or change of the Common Stock (other than changes resulting
from a subdivision or combination), 
 ii.    any consolidation, merger, combination or similar
transaction involving the Company, 
 iii.    any sale, lease or other transfer to a third party of the
consolidated assets of the Company and the Company’s Subsidiaries substantially as an entirety or 

iv.    any statutory share exchange, 

in each case, as a result of which the Common Stock would be converted into, or exchanged for, stock, other securities, other property or assets (including
cash or any combination thereof) (any such event, a “Merger Event”), then, at and after the effective time of such Merger Event, the right to convert each $1,000 Capitalized Principal Amount of Notes shall be changed into a right to
convert such Capitalized Principal Amount of Notes into the kind and amount of shares of stock, other securities or other property or assets (including cash or any combination thereof) that a holder of a number of shares of Common Stock equal to the
Conversion Rate immediately prior to such Merger Event would have owned or been entitled to receive (the “Reference Property,” with each “unit of Reference Property” meaning the kind and amount of Reference Property
that a holder of one share of Common Stock is entitled to receive) upon such Merger Event and, prior to or at the effective time of such Merger Event, the Company or the successor or purchasing Person, as the case may be, shall amend the Notes
and/or execute with the Trustee a supplemental indenture (in each case permitted under Section 10.01(g)) providing for such change in the right to convert each $1,000 Capitalized Principal Amount of Notes; provided, however, that
at and after the effective time of the Merger Event (A) the Company shall continue to have the right to determine the form of consideration to be paid or delivered, as the case may be, upon conversion of Notes in accordance with
Section 14.02 and (B) (I) any amount payable in cash upon conversion of the Notes in accordance with Section 14.02 shall continue to be payable in cash, (II) any shares of Common Stock that the Company would have been required to
deliver upon conversion of the Notes in accordance with Section 14.02 shall instead be deliverable in the amount and type of Reference Property that a holder of that number of shares of Common Stock would have been entitled to receive in such
Merger Event and (III) the Daily VWAP shall be calculated based on the value of a unit of Reference Property. 
 If the Merger Event
causes the Common Stock to be converted into, or exchanged for, the right to receive more than a single type of consideration (determined based in part upon any form of stockholder election), then (i) the Reference Property into which the Notes
will be convertible shall be deemed to be the weighted average of the types and amounts of consideration actually received by the holders of Common Stock, and (ii) the unit of Reference Property for purposes of the immediately preceding
paragraph shall refer to the consideration referred to in clause (i) attributable to one share of Common Stock. If the holders of the Common Stock receive only 

  
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cash in such Merger Event, then for all conversions for which the relevant Conversion Date occurs after the effective date of such Merger Event (A) the consideration due upon conversion of
each $1,000 Capitalized Principal Amount of Notes shall be solely cash in an amount equal to the Conversion Rate in effect on the Conversion Date, multiplied by the price paid per share of Common Stock in such Merger Event and (B) the
Company shall satisfy the Conversion Obligation by paying cash to converting Holders on or prior to the tenth Business Day immediately following the relevant Conversion Date. The Company shall notify Holders, the Trustee and the Conversion Agent (if
other than the Trustee) of such weighted average as soon as practicable after such determination is made. 
 b.    When
the Company executes a supplemental indenture pursuant to subsection (a) of this Section 14.06, the Company shall promptly file with the Trustee an Officer’s Certificate briefly stating the reasons therefor, the kind or amount of
cash, securities or property or asset that will comprise a unit of Reference Property after any such Merger Event, any adjustment to be made with respect thereto and that all conditions precedent have been complied with, and shall promptly deliver
notice thereof to all Holders. The Company shall cause notice of the execution of such supplemental indenture to be delivered to each Holder within 20 days after execution thereof. Failure to deliver such notice shall not affect the legality or
validity of such supplemental indenture. 
 c.    The Company shall not become a party to any Merger Event unless its
terms are consistent with this Section 14.06. None of the foregoing provisions shall affect the right of a holder of Notes to convert its Notes into cash, shares of Common Stock or a combination of cash and shares of Common Stock, as
applicable, as set forth in Section 14.01 and Section 14.02 prior to the effective date of such Merger Event. 

d.    The above provisions of this Section shall similarly apply to successive Merger Events. 

Section 14.07.    Certain Covenants. 

a.    The Company covenants that all shares of Common Stock issued upon conversion of Notes will be fully paid and non-assessable by the Company and free from all taxes, liens and charges with respect to the issue thereof, subject to the satisfaction of any obligation of any Applicable Withholding Agent in respect of withholding
taxes in accordance with Section 17.17. 
 b.    The Company covenants that, if any shares of Common Stock to be
provided for the purpose of conversion of Notes hereunder require registration with or approval of any governmental authority under any federal or state law before such shares of Common Stock may be validly issued upon conversion, the Company will,
to the extent then permitted by the rules and interpretations of the Commission, secure such registration or approval, as the case may be. 

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

  
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 d.    To the extent necessary to satisfy its obligations under this
Indenture, prior to issuing any shares of Common Stock, the Company will reserve out of its authorized but unissued shares of Common Stock a sufficient number of shares of Common Stock to permit the conversion of the Notes. 

Section 14.08.    Responsibility of Trustee. The Trustee and any other Conversion Agent shall not at any time
be under any duty or responsibility to any Holder to determine the Conversion Rate (or any adjustment thereto) or whether any facts exist that may require any adjustment (including any increase) of the Conversion Rate, or with respect to the nature
or extent or calculation of any such adjustment when made, or with respect to the method employed, or herein or in any supplemental indenture provided to be employed, in making the same. The Trustee and any other Conversion Agent shall not be
accountable with respect to the validity or value (or the kind or amount) of any shares of Common Stock, or of any securities, property or cash that may at any time be issued or delivered upon the conversion of any Note; and the Trustee and any
other Conversion Agent make no representations with respect thereto. Neither the Trustee nor any Conversion Agent shall be responsible for any failure of the Company to issue, transfer or deliver any shares of Common Stock or stock certificates or
other securities or property or cash upon the surrender of any Note for the purpose of conversion or to comply with any of the duties, responsibilities or covenants of the Company contained in this Article. Without limiting the generality of the
foregoing, neither the Trustee nor any Conversion Agent shall be under any responsibility to determine the correctness of any provisions contained in any supplemental indenture entered into pursuant to Section 14.06 relating either to the kind
or amount of shares of stock or securities or property (including cash) receivable by Holders upon the conversion of their Notes after any event referred to in such Section 14.06 or to any adjustment to be made with respect thereto, but,
subject to the provisions of Section 7.01, may accept (without any independent investigation) as conclusive evidence of the correctness of any such provisions, and shall be protected in relying upon, the Officer’s Certificate (which the
Company shall be obligated to file with the Trustee prior to the execution of any such supplemental indenture) with respect thereto. 

Section 14.09.    Stockholder Rights Plans. If the Company has a stockholder rights plan in effect upon
conversion of the Notes, each share of Common Stock, if any, issued upon such conversion shall be entitled to receive the appropriate number of rights, if any, and the certificates representing the Common Stock issued upon such conversion shall bear
such legends, if any, in each case as may be provided by the terms of any such stockholder rights plan, as the same may be amended from time to time. However, if, prior to any conversion of Notes, the rights have separated from the shares of Common
Stock in accordance with the provisions of the applicable stockholder rights plan, the Conversion Rate shall be adjusted at the time of separation as if the Company distributed to all or substantially all holders of the Common Stock Distributed
Property as provided in Section 14.03(c), subject to readjustment in the event of the expiration, termination or redemption of such rights. 

Section 14.10.    Limit on Issuance of Shares of Common Stock Upon Conversion. Notwithstanding anything to the
contrary in this Indenture, if an event occurs that would result in an increase in the Conversion Rate by an amount in excess of limitations imposed by any shareholder approval rules or listing standards of any national or regional securities
exchange that are applicable to the Company, the Company will, at its option, either obtain stockholder 

  
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approval of any issuance of Common Stock upon conversion of the Notes in excess of such limitations or pay cash in lieu of delivering any shares of Common Stock otherwise deliverable upon
conversions in excess of such limitations based on the Daily VWAP for each Trading Day of the relevant Observation Period in respect of which, in lieu of delivering shares of Common Stock, the Company pays cash pursuant to this Section 14.10.

 Section 14.11.    Exchange in Lieu of Conversion. 

a.    When a Holder surrenders its Notes for conversion, the Company may, at its election (an “Exchange
Election”), direct the Conversion Agent to deliver, on or prior to the second Trading Day immediately following the Conversion Date, such Notes to one or more financial institutions designated by the Company (each, a “Designated
Financial Institution”) for exchange in lieu of conversion. In order to accept any Notes surrendered for conversion, the Designated Financial Institution(s) must agree to timely pay and/or deliver, as the case may be, in exchange for such
Notes, the cash, shares of Common Stock or combination thereof that would otherwise be due upon conversion pursuant to Section 14.02 or such other amount agreed to by the Holder and the Designated Financial Institution(s) (the
“Conversion Consideration”). If the Company makes an Exchange Election, the Company shall, by the close of business on the second Trading Day following the relevant Conversion Date, notify in writing the Trustee, the Conversion
Agent (if other than the Trustee) and the Holder surrendering Notes for conversion that the Company has made the Exchange Election, and the Company shall promptly notify the Designated Financial Institution(s) of the relevant deadline for delivery
of the Conversion Consideration and the type of Conversion Consideration to be paid and/or delivered, as the case may be. For the avoidance of doubt, no failure of the Designated Financial Institution to deliver the Conversion Consideration shall
limit the Holders’ right to convert the Notes pursuant to this Article 14. 
 b.    Any Notes delivered to the
Designated Financial Institution(s) shall remain outstanding, subject to the applicable procedures of the Depositary in the case of Global Notes. If the Designated Financial Institution(s) agree(s) to accept any Notes for exchange but does not
timely pay and/or deliver, as the case may be, the related Conversion Consideration, or if such Designated Financial Institution(s) does not accept the Notes for exchange, the Company shall pay and/or deliver, as the case may be, the relevant
Conversion Consideration, as, and at the time, required pursuant to this Indenture as if the Company had not made the Exchange Election. 

c.    The Company’s designation of any Designated Financial Institution(s) to which the Notes may be submitted for
exchange does not require such Designated Financial Institution(s) to accept any Notes. 
 Article 15.    Repurchase of
Notes at Option of Holders 
 Section 15.01.    Intentionally Omitted. 

Section 15.02.    Repurchase at Option of Holders Upon a Fundamental Change. 

a.    If a Fundamental Change occurs at any time, each Holder shall have the right, at such Holder’s option, to
require the Company to repurchase for cash all of such Holder’s Notes, but not less than all, on the date (the “Fundamental Change Repurchase Date”) specified by 

  
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the Company that is not less than 20 calendar days or more than 35 Business Days following the date of the Fundamental Change Company Notice at a repurchase price equal to 100% of the Capitalized
Principal Amount of such Notes, plus the Make-Whole Amount, plus any accrued interest thereon that has not been paid or capitalized to, but excluding, the Fundamental Change Repurchase Date (the “Fundamental Change Repurchase
Price”), unless the Fundamental Change Repurchase Date falls after a Regular Record Date but on or prior to the Interest Payment Date to which such Regular Record Date relates, in which case the Company shall instead pay in cash at the Cash
Interest Rate the full amount of accrued and unpaid interest to Holders of record as of such Regular Record Date (notwithstanding any prior election (or deemed election) by the Company to pay such interest pursuant to the Capitalization Method), and
the Fundamental Change Repurchase Price shall be equal to 100% of the Capitalized Principal Amount of Notes to be repurchased pursuant to this Article 15. 

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

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

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

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

iii.    in the case of Physical Notes, the certificate numbers of the Notes to be delivered for repurchase;
and 
 iv.    that the Notes are to be repurchased by the Company pursuant to the applicable provisions
of the Notes and this Indenture; 
 provided, however, that if the Notes are Global Notes, the Fundamental Change Repurchase Notice must comply with
appropriate Depositary procedures. 
 Notwithstanding anything herein to the contrary, any Holder delivering to the Paying Agent the
Fundamental Change Repurchase Notice contemplated by this Section 15.02 shall have the right to withdraw, in whole or in part, such Fundamental Change Repurchase Notice at any time prior to the close of business on the fifth Business Day
immediately preceding the Fundamental Change Repurchase Date by delivery of a written notice of withdrawal to the Paying Agent in accordance with Section 15.03. 

  
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 The Paying Agent shall promptly notify the Company of the receipt by it of any Fundamental
Change Repurchase Notice or written notice of withdrawal thereof. 
 c.    On or before the 20th Business Day after the occurrence of the effective date of a Fundamental Change, the Company shall provide to all Holders of Notes and the Trustee and the Paying Agent (in the case of a Paying Agent
other than the Trustee) a notice (the “Fundamental Change Company Notice”) of the occurrence of the effective date of the Fundamental Change and of the repurchase right at the option of the Holders arising as a result thereof. In
the case of Physical Notes, such notice shall be by first class mail or, in the case of Global Notes, such notice shall be delivered in accordance with the applicable procedures of the Depositary. Each Fundamental Change Company Notice shall
specify: 
 i.    the events causing the Fundamental Change; 

ii.    the effective date of the Fundamental Change; 

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

iv.    the Fundamental Change Repurchase Price; 

v.    the Fundamental Change Repurchase Date; 

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

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

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

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

No failure of the Company to give the foregoing notices and no defect therein shall limit the Holders’ repurchase rights or affect the
validity of the proceedings for the repurchase of the Notes pursuant to this Section 15.02. 
 At the Company’s request, the
Trustee shall give such notice in the Company’s name and at the Company’s expense; provided, however, that, in all cases, the text of such Fundamental Change Company Notice shall be prepared by the Company. 

d.    Notwithstanding anything to the contrary in this Article 15, the Company shall not be required to repurchase, or to
make an offer to repurchase, the Notes upon a Fundamental Change if a third party makes such an offer in the same manner, at the same time and otherwise 

  
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in compliance with the requirements for an offer made by the Company as set forth in this Article 15 and such third party purchases all Notes properly surrendered and not validly withdrawn under
its offer in the same manner, at the same time and otherwise in compliance with the requirements for an offer made by the Company as set forth above. For the avoidance of doubt, no failure of such third party to repurchase the Notes shall limit the
Holders’ repurchase rights or affect the validity of the proceedings for the repurchase of the Notes pursuant to this Section 15.02. 

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

Section 15.03.    Withdrawal of Fundamental Change Repurchase Notice. A Fundamental Change Repurchase Notice
may be withdrawn (in whole or in part) by means of a written notice of withdrawal delivered to the Corporate Trust Office of the Paying Agent in accordance with this Section 15.03 at any time prior to the close of business on the Business Day
immediately preceding the Fundamental Change Repurchase Date, specifying: 
 i.    the principal amount
of the Notes with respect to which such notice of withdrawal is being submitted, 
 ii.    if Physical
Notes have been issued, the certificate number of the Note in respect of which such notice of withdrawal is being submitted, and 

iii.    the principal amount, if any, of such Note that remains subject to the original Fundamental Change
Repurchase Notice, which portion must be in principal amounts of $1,000 or any integral multiple of $1.00 in excess thereof; 
 provided,
however, that if the Notes are Global Notes, the notice must comply with appropriate procedures of the Depositary. 

Section 15.04.    Deposit of Fundamental Change Repurchase Price. 

a.    The Company will deposit with the Trustee (or other Paying Agent appointed by the Company, or if the Company is
acting as its own Paying Agent, set aside, segregate and hold in trust as provided in Section 4.04) on or prior to 11:00 a.m., New York City time, on the Fundamental Change Repurchase Date an amount of money sufficient to repurchase all of the
Notes to be repurchased at the appropriate Fundamental Change Repurchase Price. Subject to receipt of funds and/or Notes by the Trustee (or other Paying Agent appointed by the Company), 

  
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payment for Notes surrendered for repurchase (and not withdrawn prior to the close of business on the Business Day immediately preceding the Fundamental Change Repurchase Date) will be made on
the later of (i) the Fundamental Change Repurchase Date (provided the Holder has satisfied the conditions in Section 15.02) and (ii) the time of book-entry transfer or the delivery of such Note to the Trustee (or other Paying
Agent appointed by the Company) by the Holder thereof in the manner required by Section 15.02 by mailing checks for the amount payable to the Holders of such Notes entitled thereto as they shall appear in the Note Register; provided,
however, that payments to the Depositary shall be made by wire transfer of immediately available funds to the account of the Depositary or its nominee. The Trustee shall, promptly after such payment and upon written demand by the Company,
return to the Company any funds in excess of the Fundamental Change Repurchase Price. 
 b.    If by 11:00 a.m. New York
City time, on the Fundamental Change Repurchase Date, the Trustee (or other Paying Agent appointed by the Company) holds money sufficient to make payment on all the Notes or portions thereof that are to be repurchased on such Fundamental Change
Repurchase Date, then, with respect to the Notes that have been properly surrendered for repurchase and have not been validly withdrawn, such Notes will cease to be outstanding, interest will cease to accrue on such Notes (whether or not book-entry
transfer of the Notes has been made or the Notes have been delivered to the Trustee or Paying Agent) and all other rights of the Holders of such Notes will terminate (other than the right to receive the Fundamental Change Repurchase Price and, if
applicable, accrued interest that has not been paid or capitalized). 
 c.    Upon surrender of a Note that is to be
repurchased in part pursuant to Section 15.02, the Company shall execute and the Trustee shall authenticate and deliver to the Holder a new Note in an authorized denomination equal in principal amount to the unrepurchased portion of the Note
surrendered. 
 Section 15.05.    Compliance with Applicable Laws Upon Repurchase of Notes. Notwithstanding
anything to the contrary herein, to the extent that compliance with this Article 15 relating to the Company’s obligations to repurchase the Notes upon a Fundamental Change would result in a violation of any federal or state securities laws or
other applicable laws or regulations, the Company will comply with the applicable securities laws and regulations and will not be deemed to have breached its obligations under this Article 15 by virtue of such conflict. Without limiting the
generality of the foregoing, the Fundamental Change Repurchase Date shall be subject to postponement in order to allow the Company to comply with applicable law. 

Article 16.    Optional Redemption 

Section 16.01.    Optional Redemption. No sinking fund is provided for the Notes. The Company may redeem, at
any time and from time to time (an “Optional Redemption”), for cash all, but not less than all of the Notes, at the Redemption Price, if the volume weighted average price of the Company’s Common Stock for the 10 Trading Days
immediately preceding the date on which the Company provides the Redemption Notice in accordance with Section 16.02 has been at least 130% of the Conversion Price then in effect. 

  
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 Section 16.02.    Notice of Optional Redemption. 

a.    In case the Company exercises its Optional Redemption right to redeem all of the Notes pursuant to
Section 16.01, it shall fix a date for redemption (each, a “Redemption Date”) and it or, at its written request received by the Trustee not less than five calendar days prior to the date such Redemption Notice is to be sent (or
such shorter period of time as may be acceptable to the Trustee), the Trustee, in the name of and at the expense of the Company, shall deliver or cause to be delivered a notice of such Optional Redemption (a “Redemption Notice”) not
less than 10 nor more than 70 Scheduled Trading Days prior to the Redemption Date to each Holder of Notes; provided that, if the Company shall give such notice, it shall also give written notice of the Redemption Date to the Trustee;
provided further that if, in accordance with the provisions described in Section 14.02(a)(iii), the Company elects through delivery of a Settlement Notice to settle all conversions of Notes with a Conversion Date that occurs on or after
the date of issuance of a Redemption Notice with respect to the Notes and prior to the related Redemption Date by Physical Settlement, then the Company may instead elect to choose a Redemption Date that is a Business Day not less than five nor more
than 60 calendar days after the date the Company sends such Redemption Notice to each Holder so to be redeemed. The Redemption Date must be a Business Day. 

b.    The Redemption Notice, if delivered in the manner herein provided, shall be conclusively presumed to have been duly
given, whether or not the Holder receives such notice. In any case, failure to give such Redemption Notice by mail or any defect in the Redemption Notice to the Holder of any Note designated for redemption shall not affect the validity of the
proceedings for the redemption of any other Note. 
 c.    Each Redemption Notice shall specify: 

i.    the Redemption Date; 

ii.    the Redemption Price; 

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

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

v.    that Holders may surrender their Notes for conversion at any time prior to the close of business on
the Scheduled Trading Day immediately preceding the Redemption Date; 
 vi.    the procedures a
converting Holder must follow to convert its Notes and the Settlement Method and Specified Dollar Amount, if applicable; 

vii.    the Conversion Rate; and 

viii.    the CUSIP, ISIN or other similar numbers, if any, assigned to such Notes; 

  
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 A Redemption Notice shall be irrevocable. 

Section 16.03.    Payment of Notes Called for Redemption. 

a.    If any Redemption Notice has been given in respect of the Notes in accordance with Section 16.02, the Notes
shall become due and payable on the Redemption Date at the place or places stated in the Redemption Notice and at the applicable Redemption Price. On presentation and surrender of the Notes at the place or places stated in the Redemption Notice, the
Notes shall be paid and redeemed by the Company at the applicable Redemption Price. 
 b.    Prior to the open of
business on the Redemption Date, the Company shall deposit with the Paying Agent or, if the Company or a Subsidiary of the Company is acting as the Paying Agent, shall segregate and hold in trust as provided in Section 7.05 an amount of cash
(in immediately available funds if deposited on the Redemption Date), sufficient to pay the Redemption Price of all of the Notes to be redeemed on such Redemption Date. Subject to receipt of funds by the Paying Agent, payment for the Notes to be
redeemed shall be made on the Redemption Date for such Notes. The Paying Agent shall, promptly after such payment and upon written demand by the Company, return to the Company any funds in excess of the Redemption Price. 

c.    Upon surrender of a Note that is to be redeemed in part pursuant to Section 16.02, the Company shall execute
and the Trustee shall authenticate and deliver to the Holder a new Note in an authorized denomination equal in principal amount to the unredeemed portion of the Note surrendered. 

Section 16.04.    Restrictions on Redemption. The Company may not redeem any Notes on any date if the
principal amount of the Notes has been accelerated in accordance with the terms of this Indenture, and such acceleration has not been rescinded, on or prior to the redemption Date (except in the case of an acceleration resulting from a Default by
the Company in the payment of the Redemption Price with respect to such Notes). 
 Article 17.    Miscellaneous
Provisions 
 Section 17.01.    Provisions Binding on Company’s Successors. All the
covenants, stipulations, promises and agreements of the Company contained in this Indenture shall bind its successors and assigns whether so expressed or not. 

Section 17.02.    Official Acts by Successor Corporation. Any act or proceeding by any provision of this
Indenture authorized or required to be done or performed by any board, committee or Officer of the Company shall and may be done and performed with like force and effect by the like board, committee or officer of any corporation or other entity that
shall at the time be the lawful sole successor of the Company. 
 Section 17.03.    Addresses for Notices,
Etc. Any notice or demand that by any provision of this Indenture is required or permitted to be given or served by the Trustee or by the Holders on the Company shall be deemed to have been sufficiently given or made, for all purposes if given
or served by being deposited postage prepaid by registered or certified mail in a post office letter box addressed (until another address is filed by the Company with the Trustee) to Aspen 

  
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Aerogels, Inc., 30 Forbes Road, Building B, Northborough, MA 01532, Attention: Chief Financial Officer, or sent electronically to an email address specified by the Company to the Trustee and the
Holders. Any notice, direction, request or demand hereunder to or upon the Trustee shall be deemed to have been sufficiently given or made, for all purposes, if given or served by being deposited postage prepaid by registered or certified mail in a
post office letter box addressed to the Corporate Trust Office. 
 The Trustee, by notice to the Company, may designate additional or
different addresses for subsequent notices or communications. 
 Any notice or communication delivered or to be delivered to a Holder of
Physical Notes shall be mailed to it by first class mail, postage prepaid, at its address as it appears on the Note Register, or sent electronically to an email address specified by such Holder to the Trustee and the Company, and shall be
sufficiently given to it if so mailed or sent within the time prescribed. Any notice or communication delivered or to be delivered to a Holder of Global Notes shall be delivered in accordance with the applicable procedures of the Depositary and
shall be sufficiently given to it if so delivered within the time prescribed. 
 Failure to mail or deliver a notice or communication to a
Holder or any defect in it shall not affect its sufficiency with respect to other Holders. If a notice or communication is mailed or delivered, as the case may be, in the manner provided above, it is duly given, whether or not the addressee receives
it. 
 In case by reason of the suspension of regular mail service or by reason of any other cause it shall be impracticable to give such
notice to Holders by mail, then such notification as shall be made with the approval of the Trustee shall constitute a sufficient notification for every purpose hereunder. 

Section 17.04.    Governing Law; Jurisdiction. THIS INDENTURE AND EACH NOTE, AND ANY CLAIM, CONTROVERSY OR
DISPUTE ARISING UNDER OR RELATED TO THIS INDENTURE AND EACH NOTE, SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK (WITHOUT REGARD TO THE CONFLICTS OF LAWS PROVISIONS THEREOF). 

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

The Company irrevocably and unconditionally waives, to the fullest extent permitted by law, any objection which it may now or hereafter have
to the laying of venue of any of the aforesaid actions, suits or proceedings arising out of or in connection with this Indenture brought 

  
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in the courts of the State of New York or the courts of the United States located in the Borough of Manhattan, New York City, New York and hereby further irrevocably and unconditionally waives
and agrees not to plead or claim in any such court that any such action, suit or proceeding brought in any such court has been brought in an inconvenient forum. 

Section 17.05.    Evidence of Compliance with Conditions Precedent; Certificates and Opinions of Counsel to
Trustee. Upon any application or demand by the Company to the Trustee to take any action under any of the provisions of this Indenture, the Company shall, if requested by the Trustee, furnish to the Trustee an Officer’s Certificate stating
that such action is permitted by the terms of this Indenture. 
 Each Officer’s Certificate provided for, by or on behalf of the
Company in this Indenture and delivered to the Trustee with respect to compliance with this Indenture (other than the Officer’s Certificates provided for in Section 4.08) shall include a statement that the person signing such certificate
is familiar with the requested action and this Indenture; a brief statement as to the nature and scope of the examination or investigation upon which the statement contained in such certificate is based; a statement that, in the judgment of such
person, he or she has made such examination or investigation as is necessary to enable him or her to express an informed judgment as to whether or not such action is permitted by this Indenture; and a statement as to whether or not, in the judgment
of such person, such action is permitted by this Indenture. 
 Notwithstanding anything to the contrary in this Section 17.05, if any
provision in this Indenture specifically provides that the Trustee shall or may receive an Opinion of Counsel in connection with any action to be taken by the Trustee or the Company hereunder, the Trustee shall be entitled to, or entitled to
request, such Opinion of Counsel. 
 Section 17.06.    Legal Holidays. In any case where any Interest
Payment Date, any Redemption Date, any Fundamental Change Repurchase Date or the Maturity Date is not a Business Day, then any action to be taken on such date need not be taken on such date, but may be taken on the next succeeding Business Day with
the same force and effect as if taken on such date, and no interest shall accrue in respect of the delay. 

Section 17.07.    No Security Interest Created. Nothing in this Indenture or in the Notes, expressed or
implied, shall be construed to constitute a security interest under the Uniform Commercial Code or similar legislation, as now or hereafter enacted and in effect, in any jurisdiction. 

Section 17.08.    Benefits of Indenture. Nothing in this Indenture or in the Notes, expressed or implied,
shall give to any Person, other than the Holders, the parties hereto, any Paying Agent, any Conversion Agent, any authenticating agent, any Note Registrar and their successors hereunder, any benefit or any legal or equitable right, remedy or claim
under this Indenture. 
 Section 17.09.    Table of Contents, Headings, Etc. The table of contents and the
titles and headings of the articles and sections of this Indenture have been inserted for convenience of reference only, are not to be considered a part hereof, and shall in no way modify or restrict any of the terms or provisions hereof. 

  
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 Section 17.10.    Authenticating Agent. The Trustee may
appoint an authenticating agent that shall be authorized to act on its behalf and subject to its direction in the authentication and delivery of Notes in connection with the original issuance thereof and transfers and exchanges of Notes hereunder,
including under Section 2.04, Section 2.05, Section 2.06, Section 2.07, Section 10.04, Section 15.04 and Section 16.03 as fully to all intents and purposes as though the authenticating agent had been expressly
authorized by this Indenture and those Sections to authenticate and deliver Notes. For all purposes of this Indenture, the authentication and delivery of Notes by the authenticating agent shall be deemed to be authentication and delivery of such
Notes “by the Trustee” and a certificate of authentication executed on behalf of the Trustee by an authenticating agent shall be deemed to satisfy any requirement hereunder or in the Notes for the Trustee’s certificate of
authentication. Such authenticating agent shall at all times be a Person eligible to serve as trustee hereunder pursuant to Section 7.08. 

Any corporation or other entity into which any authenticating agent may be merged or converted or with which it may be consolidated, or any
corporation or other entity resulting from any merger, consolidation or conversion to which any authenticating agent shall be a party, or any corporation or other entity succeeding to the corporate trust business of any authenticating agent, shall
be the successor of the authenticating agent hereunder, if such successor corporation or other entity is otherwise eligible under this Section 17.10, without the execution or filing of any paper or any further act on the part of the parties
hereto or the authenticating agent or such successor corporation or other entity. 
 Any authenticating agent may at any time resign by
giving written notice of resignation to the Trustee and to the Company. The Trustee may at any time terminate the agency of any authenticating agent by giving written notice of termination to such authenticating agent and to the Company. Upon
receiving such a notice of resignation or upon such a termination, or in case at any time any authenticating agent shall cease to be eligible under this Section, the Trustee may appoint a successor authenticating agent (which may be the Trustee),
shall give written notice of such appointment to the Company and shall deliver notice of such appointment to all Holders. 
 The Company
agrees to pay to the authenticating agent from time to time reasonable compensation for its services although the Company may terminate the authenticating agent, if it determines such agent’s fees to be unreasonable. 

The provisions of Section 7.02, Section 7.03, Section 7.04, Section 8.03 and this Section 17.10 shall be applicable
to any authenticating agent. 
 If an authenticating agent is appointed pursuant to this Section 17.10, the Notes may have endorsed
thereon, in addition to the Trustee’s certificate of authentication, an alternative certificate of authentication in the following form: 
  

			
	  
	 	,
	as Authenticating Agent, certifies that this is one of the Notes described in the within-named Indenture.


 

			
	By:	 	  

	Authorized Officer


  
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 Section 17.11.    Execution in Counterparts. This Indenture
may be executed in any number of counterparts, each of which shall be an original, but such counterparts shall together constitute but one and the same instrument. The exchange of copies of this Indenture and of signature pages by facsimile or PDF
transmission shall constitute effective execution and delivery of this Indenture as to the parties hereto and may be used in lieu of the original Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be
deemed to be their original signatures for all purposes. 
 Section 17.12.    Severability. In the event any
provision of this Indenture or in the Notes shall be invalid, illegal or unenforceable, then (to the extent permitted by law) the validity, legality or enforceability of the remaining provisions shall not in any way be affected or impaired. 

Section 17.13.    Waiver of Jury Trial. EACH OF THE COMPANY, EACH HOLDER OF THE NOTES BY ACCEPTANCE HEREOF,
AND THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS INDENTURE, THE NOTES OR THE TRANSACTIONS CONTEMPLATED HEREBY.

 Section 17.14.    Force Majeure. In no event shall the Trustee be responsible or liable for any failure
or delay in the performance of its obligations hereunder arising out of or caused by, directly or indirectly, forces beyond its control, including, without limitation, strikes, work stoppages, accidents, acts of war or terrorism, civil or military
disturbances, nuclear or natural catastrophes or acts of God, and interruptions, loss or malfunctions of utilities, communications or computer (software and hardware) services; it being understood that the Trustee shall use reasonable efforts that
are consistent with accepted practices in the banking industry to resume performance as soon as practicable under the circumstances. 

Section 17.15.    Calculations. Except as otherwise provided herein, the Company shall be responsible for
making all calculations called for under the Notes. These calculations include, but are not limited to, determinations of the Capitalization Amounts, the Last Reported Sale Prices of the Common Stock, the Daily VWAPs, the Daily Conversion Values,
the Daily Settlement Amounts, accrued interest payable on the Notes and the Conversion Rate of the Notes. The Company shall make all these calculations in good faith and, absent manifest error, the Company’s calculations shall be final and
binding on Holders of Notes. The Company shall provide a schedule of its calculations to each of the Trustee and the Conversion Agent, and each of the Trustee and Conversion Agent is entitled to rely conclusively upon the accuracy of the
Company’s calculations without independent verification. The Trustee will forward the Company’s calculations to any Holder of Notes upon the request of that Holder at the sole cost and expense of the Company. 

Section 17.16.    USA PATRIOT Act. The parties hereto acknowledge that in accordance with Section 326 of
the USA PATRIOT Act, the Trustee, like all financial institutions and in order to help fight the funding of terrorism and money laundering, is required to obtain, verify, and record information that identifies each person or legal entity that
establishes a relationship or opens an account with the Trustee. The parties to this Indenture agree that they will provide the Trustee with such information as it may request in order for the Trustee to satisfy the requirements of the USA PATRIOT
Act. 

  
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 Section 17.17.    Withholding Taxes. Each Holder of a Note
agrees that, notwithstanding anything herein to the contrary, the Company, the Paying Agent, the Conversion Agent or the Trustee (an “Applicable Withholding Agent”) shall have the right to deduct and withhold from any payment or
distribution made with respect to the Notes (or the issuance of shares of Common Stock upon conversion of the Notes) such amounts as are required to be deducted or withheld with respect to the making of such payment or distribution (or issuance)
under any applicable tax law. In the case of any withholding obligation that is not accompanied by a corresponding payment, distribution or issuance, including deemed dividends or amounts treated as original issue discount for tax purposes, any such
withholding tax may be withheld from subsequent payments on the Notes (or the issuance of shares of Common Stock upon conversion of the Notes, or dividends or any other amounts payable with respect to such shares). If an Applicable Withholding Agent
is required to remit any withholding tax payments to the applicable Governmental Entity in respect of such an item of income prior to any such subsequent payment or issuance, the Holder shall promptly upon notice reimburse the Applicable Withholding
Agent for the required withholding tax payment. To the extent that any amounts are deducted or withheld as described in this Section 17.17, such deducted or withheld amounts shall be treated for all purposes of this Agreement as having been
paid to the person in respect of which such deduction or withholding was made. Each Holder agrees to provide to the Company, with a copy to the Trustee, a fully completed Internal Revenue Service Form W-9 or W-8 (or applicable successor form), with any required attachments, as well as any other information determined by the Company or the Trustee to be reasonably necessary for an Applicable Withholding Agent to
determine its withholding responsibilities with respect to such Holder, (i) prior to, and as a condition to, becoming a Holder hereunder, (ii) upon reasonable demand by the Company or the Trustee and (iii) promptly upon learning that
any such tax form previously provided by it has become obsolete or incorrect. 
 [Remainder of page intentionally left blank] 

  
 86 












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

			
	ASPEN AEROGELS, INC.
		
	By:	 	  

		
		 	Name:
		
		 	Title:
	
	[TRUSTEE], as Trustee
		
	By:	 	  

		
		 	Name:
		
		 	Title:












 EXHIBIT A 

[FORM OF FACE OF NOTE] 
 [INCLUDE
FOLLOWING LEGEND IF A GLOBAL NOTE] 
 [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK
CORPORATION (“DTC”), TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC (AND ANY PAYMENT HEREUNDER IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS
WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.] 
 [INCLUDE FOLLOWING LEGEND IF A RESTRICTED
SECURITY] 
 [THIS SECURITY AND THE COMMON STOCK, IF ANY, ISSUABLE UPON CONVERSION OF THIS SECURITY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
1933, AS AMENDED (THE “SECURITIES ACT”), AND MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED EXCEPT IN ACCORDANCE WITH THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF OR OF A BENEFICIAL INTEREST HEREIN, THE ACQUIRER AGREES FOR
THE BENEFIT OF ASPEN AEROGELS, INC. (THE “COMPANY”) THAT IT WILL NOT OFFER, SELL, PLEDGE OR OTHERWISE TRANSFER THIS SECURITY OR ANY BENEFICIAL INTEREST HEREIN EXCEPT: 

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

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

(C)    PURSUANT TO AN EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT OR ANY
OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. 
 PRIOR TO THE REGISTRATION OF ANY TRANSFER IN
ACCORDANCE WITH CLAUSE (C) 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. 

  
 A-1 












 THIS SECURITY IS SUBJECT TO RESTRICTIONS ON TRANSFER AS SET FORTH IN A NOTE PURCHASE
AGREEMENT DATED AS OF FEBRUARY 15, 2022 (AS IT MAY BE AMENDED FROM TIME TO TIME), BY AND AMONG THE COMPANY AND CERTAIN OTHER PARTIES THERETO, COPIES OF WHICH ARE PUBLICLY FILED OR ON FILE WITH THE SECRETARY OF THE COMPANY, AND THIS SECURITY MAY NOT
BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED EXCEPT IN COMPLIANCE THEREWITH.] 
 THIS NOTE HAS BEEN ISSUED WITH “ORIGINAL ISSUE
DISCOUNT” (WITHIN THE MEANING OF SECTION 1272 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED). UPON WRITTEN REQUEST, THE ISSUER OF THIS NOTE WILL PROMPTLY MAKE AVAILABLE TO ANY HOLDER OF THIS NOTE THE INFORMATION REQUIRED TO BE FURNISHED BY
TREASURY REGULATIONS SECTION 1.1275-3. IN ORDER TO REQUEST SUCH INFORMATION, A HOLDER OF THIS NOTE SHOULD CONTACT THE [•] AT 30 FORBES ROAD, BUILDING B, NORTHBOROUGH, MA 01532, PHONE NUMBER [•]. 


  
 A-2 












 Aspen Aerogels, Inc. 

Convertible Senior PIK Toggle Note due 2027 
 No.
[    ] Initially $[    ] 
 [CUSIP No. [    ]] 

Aspen Aerogels, Inc., a corporation duly organized and validly existing under the laws of the State of Delaware (the
“Company,” which term includes any successor corporation or other entity under the Indenture referred to on the reverse hereof), for value received hereby promises to pay to CEDE & CO.1/ [    ]2/, or registered assigns, the principal sum [as set forth in the “Schedule of Exchanges of Notes” attached
hereto]3/ [of the Capitalized Principal Amount corresponding to the Initial Principal Amount of
$[        ]]4/, on February 18, 2027, and interest thereon as set forth below. 

This Note shall bear interest at the applicable Cash Interest Rate or PIK Interest Rate from
[            ], 20[    ], or from the most recent date to which interest had been paid or provided for to, but excluding, the next scheduled Interest Payment Date until
February 18, 2027. Interest is payable semi-annually in arrears in cash at the Cash Interest Rate or by PIK Payments at the PIK Interest Rate, pursuant to Section 2.03(d) of the Indenture, on each June 30 and December 30,
commencing on [            ], 20[    ], to Holders of record at the close of business on the preceding June 15 and December 15 (whether or not such day is a
Business Day), respectively. 
 The Company shall make payments on the Notes in the manner set forth in the Indenture. The Company has
initially designated [the Trustee]5/ [itself]6/ as the Paying Agent, Conversion Agent and Note Registrar in respect of the Notes and its office
in [    ] as a place where Notes may be presented for payment or for registration of transfer and exchange. 
 Reference
is made to the further provisions of this Note set forth on the reverse hereof, including, without limitation, provisions giving the Holder of this Note the right to convert this Note into cash, shares of Common Stock or a combination of cash and
shares of Common Stock, as applicable, on the terms and subject to the limitations set forth in the Indenture. Such further provisions shall for all purposes have the same effect as though fully set forth at this place. 

This Note, and any claim, controversy or dispute arising under or related to this Note, shall be construed in accordance with and governed
by the laws of the State of New York (without regard to the conflicts of laws provisions thereof). 
 In the case of any conflict
between this Note and the Indenture, the provisions of this Note shall control and govern. 
  

	1/ 	 Include if a global note. 



	2/ 	 Include if a physical note. 



	3/ 	 Include if a global note. 



	4/ 	 Include if a physical note. 



	5/ 	 Include for notes executed following Indenture execution. 



	6/ 	 Include for notes issued prior to Indenture execution. 



  
 A-3 












 [This Note shall not be valid or become obligatory for any purpose until the certificate of
authentication hereon shall have been signed manually, electronically or by facsimile by the Trustee or a duly authorized authenticating agent under the Indenture.]7/ 

[Remainder of page intentionally left blank] 

 

	7/ 	 Include for notes executed following Indenture execution. 



  
 A-4 












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

 

			
	ASPEN AEROGELS, INC.


			
		
	By:	 	  



			
		
		 	Name:
		
		 	Title:
		
	Dated:	 	


			
	
	[TRUSTEE’S CERTIFICATE OF AUTHENTICATION
	
	[_________]
	as Trustee, certifies that this is one of the Notes described in the within-named Indenture.


			
		
	By:	 	  



			
	Authorized Officer]8/
	
	[[_________], as Holder


			
		
	By:	 	  



			
	Authorized Officer]9/

  

	8/ 	 Include for notes executed following Indenture execution. 



	9/ 	 Include for notes issued prior to Indenture execution. 



  
 A-5 












 [FORM OF REVERSE OF NOTE] 

Aspen Aerogels, Inc. 
 Convertible
Senior PIK Toggle Note due 2027 
 This Note is one of a duly authorized issue of Notes of the Company, designated as its Convertible Senior
PIK Toggle Notes due 2027 (the “Notes”), initially in the aggregate principal amount of $100,000,000 (as increased by any PIK Payments). Additional Notes may be issued in an unlimited aggregate principal amount, subject to certain
conditions specified in the Indenture. Capitalized terms used in this Note and not defined in this Note shall have the respective meanings set forth in the Indenture (as amended in accordance herewith, the “Indenture”) [dated as of
[    ] between the Company and [    ] as trustee (the “Trustee”)]10/ [attached hereto as Exhibit A]11/. The originally issued Notes, all PIK Notes, and any additional Notes issued as set forth in the Indenture or this Note shall constitute a single class. 

[Incorporation by Reference of Provisions of the Indenture. 

At all times during which the Indenture has not been executed and delivered, to the extent not inconsistent with any other terms of the Notes
set forth herein, all of the terms and conditions of the Indenture shall be and are hereby incorporated by reference in the Notes as if fully set forth herein, and shall be binding upon the Company and, by accepting a Note, each Holder and inure to
the benefit of the Holders of the Notes, except that (a) to the extent that the Indenture requires (i) any notices, certificates or other items to be delivered by the Company to the Trustee, Paying Agent or Conversion Agent, such notices,
certificates or other items shall be delivered instead to each Holder, (ii) any Opinions of Counsel to be delivered by the Company to the Trustee, Paying Agent or Conversion Agent, such opinions shall instead be delivered to the Holders,
(iii) any notices, certificates or other items to be delivered by the Holders to the Trustee, Paying Agent or Conversion Agent, such notices, certificates or other items shall be delivered instead by the Holders to the Company, (iv) any
notices, certificates or other items to be delivered by the Trustee to the Holders, such notices, certificates or other items shall be delivered instead by the Company to the Holders (with any references to one or more Responsible Officers being
deemed to refer to any Officer of the Company), (v) any payments or deliveries to be made by the Company to the Trustee, Paying Agent or Conversion Agent for payment or delivery, as the case may be, to Holders, such payments or deliveries shall
instead be made directly by the Company to the applicable Holder in the same manner as set forth in Article 2 and Article 14 of the Indenture, (vi) any Note to be authenticated by the Trustee or an Authenticating Agent or to bear a certificate
of authentication or require any Opinion of Counsel, Officer’s Certificate or Company Order for such authentication, the Notes shall instead by authenticated by the Company (the execution and delivery of any Note by manual, electronic or
facsimile signature of the Company to be deemed to constitute such authentication for all purposes) without any requirement for any such Opinion of Counsel, Officer’s Certificate or Company Order, (vii) Notes to be canceled by the Trustee,
such Notes shall instead be cancelled by the Company, (viii) any Notes to be surrendered to the Trustee or any Paying Agent, Conversion Agent or Note Registrar, such Notes shall be surrendered instead to the Company, 

 

	10/ 	 Include for notes executed following Indenture execution. 



	11/ 	 Include for notes issued prior to Indenture execution.




  
 A-6 












 
(ix) Notes to be redeemed upon a partial redemption to be selected by the Trustee, such Notes shall be selected instead by the Company, (x) any amounts to be held in trust with the
Trustee, Paying Agent or Conversion Agent, such amounts shall instead be set aside, segregated and held in trust by the Company for the benefit of the Holders of the Notes, (xi) the Trustee to execute any amendment or supplement pursuant to
Article 10 of the Indenture, any such amendment or supplement shall be executed solely by the Company (for the avoidance of doubt, in the case of Section 10.02 of the Indenture, upon receipt of the requisite consent from Holders), or
(xii) a supplemental indenture to evidence the succession of a Successor Corporation, such succession shall instead be evidenced by an amendment to this Note which shall be permitted without Holder consent pursuant to Section 10.01(b) of
the Indenture; (b) any appointment or designation of the Trustee as Note Registrar, Paying Agent or Conversion Agent or agent for service of demands and notices in connection with the Notes, or of the Corporate Trust Office or any other office
of the Trustee for the taking of any relevant action, shall hereby be deemed to instead refer to the Company instead and its office at 30 Forbes Road, Building B, Northborough, MA 01532 (and/or such other or additional address as notified by the
Company in writing to the Holders from time to time); (c) each of Section 4.03, Section 4.04(a), Article 7, Section 10.05, Section 14.08 and Section 17.16 of the Indenture shall not apply; and (d) any and all rights
granted to the Trustee under Article 6 and Article 9 of the Indenture shall be granted to and may be exercised by the Holders of a majority in principal amount of the outstanding Notes. 

Indenture. 
 At any time,
in the Company’s sole discretion, the Company may appoint a trustee (the “Trustee”) who satisfies the eligibility requirements of Article 7 of the Indenture and, in any such event, the Company shall take whatever actions are
necessary to cause an Indenture substantially in the form of Exhibit A attached hereto to be executed and delivered by the Company and the Trustee. In such event, (i) this Note shall be cancelled and reissued, executed and authenticated in a
like principal amount as set forth in the Indenture in the form of the applicable Form of Note as set forth in Exhibit A of the Indenture as executed and (ii) the Notes shall be subject to all of the terms stated in the Indenture. In such
event, the Company may require Holders of the Notes, and each Holder by his or her acceptance hereof agrees upon the Company’s request, to surrender to the Trustee all Notes in the form hereof in exchange for replacement Notes substantially in
the form of the applicable Form of Note as set forth in Exhibit A of the Indenture as executed.]12/ 

Events of Default. 
 In
case certain Events of Default shall have occurred and be continuing, the principal of, and interest on, all Notes may be declared, by either the Trustee or Holders of at least 51% in aggregate principal amount of Notes then outstanding, and upon
said declaration shall become, due and payable, in the manner, with the effect and subject to the conditions and certain exceptions set forth in the Indenture. 

 

	12/ 	 Include for notes issued prior to Indenture execution. 



  
 A-7 












 Payments. 

Subject to the terms and conditions of the Indenture, the Company will make all payments and deliveries in respect of the Fundamental Change
Repurchase Price on the Fundamental Change Repurchase Date, the Redemption Price on any Redemption Date and the Capitalized Principal Amount on the Maturity Date, as the case may be, to the Holder who surrenders a Note to a Paying Agent to collect
such payments in respect of the Note. The Company will pay cash amounts in money of the United States that at the time of payment is legal tender for payment of public and private debts. 

Amendments and Waivers. 

The Indenture contains provisions permitting in certain circumstances, without the consent of the Holders of the Notes, and in certain other
circumstances, with the consent of the Holders of not less than a majority in aggregate principal amount of the Notes at the time outstanding, evidenced as in the Indenture provided, the amendment of the Notes and/or execution of supplemental
indentures modifying the terms of the Notes and/or the Indenture as described therein. It is also provided in the Indenture that, subject to certain exceptions, the Holders of a majority in aggregate principal amount of the Notes at the time
outstanding may on behalf of the Holders of all of the Notes waive any past Default or Event of Default under the Indenture and its consequences. 

Right to Payments. 
 Each
Holder shall have the right to receive payment or delivery, as the case may be, of (x) the principal (including the Redemption Price and the Fundamental Change Repurchase Price, if applicable) of, (y) accrued and unpaid interest, if any,
on, and (z) the consideration due upon conversion of, this Note at the place, at the respective times, at the rate and in the lawful money or shares of Common Stock, as the case may be, herein prescribed. 

Registered Form; Denominations; Transfer and Exchange. 

The Notes are issuable in registered form without coupons in denominations of $1.00 principal amount and integral multiples thereof. At the
office or agency of the Company referred to herein, and in the manner and subject to the limitations provided in the Indenture, Notes may be exchanged for a like aggregate principal amount of Notes of other authorized denominations, without payment
of any service charge but, if required by the Company [or Trustee], with payment of a sum sufficient to cover any transfer or similar tax that may be imposed in connection therewith as a result of the name of the Holder of the new Notes issued upon
such exchange of Notes being different from the name of the Holder of the old Notes surrendered for such exchange. 
 Redemption.

 The Notes shall be redeemable at the Company’s option at any time, and from time to time, in accordance with the terms and
subject to the conditions specified in the Indenture. No sinking fund is provided for the Notes. 

  
 A-8 












 Fundamental Change Repurchase Right. 

Upon the occurrence of a Fundamental Change, the Holder has the right, at such Holder’s option, to require the Company to repurchase for
cash all of such Holder’s Notes or any portion thereof (in principal amounts of $1,000 or integral multiples of $1.00 in excess thereof) on the Fundamental Change Repurchase Date at a price equal to the Fundamental Change Repurchase Price. 

Holder Conversion Rights. 

Subject to the provisions of the Indenture, the Holder hereof has the right, at its option prior to the close of business on the Business Day
immediately preceding the Maturity Date, to convert any Notes or portion thereof that is $1,000 or an integral multiple of $1.00 in excess thereof, into cash, shares of Common Stock or a combination of cash and shares of Common Stock, as applicable,
at the Conversion Rate specified in the Indenture, as adjusted from time to time as provided in the Indenture. 
 Company Conversion
Rights. 
 Subject to the provisions of the Indenture, the Company hereof has the right, at its option at any time, and from time to
time, to convert any Notes or portion thereof that is $1,000 or an integral multiple of $1.00 in excess thereof, into shares of Common Stock, at the Conversion Rate specified in the Indenture, as adjusted from time to time as provided in the
Indenture. 

  
 A-9 












 ABBREVIATIONS 

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

UNIF GIFT MIN ACT = Uniform Gifts to Minors Act 
 CUST =
Custodian 
 TEN ENT = as tenants by the entireties 
 JT TEN =
joint tenants with right of survivorship and not as tenants in common Additional abbreviations may also be used though not in the above list. 

  
 A-10 












 SCHEDULE A13/ 

SCHEDULE OF EXCHANGES OF NOTES 

Aspen Aerogels, Inc. 
 Convertible
Senior PIK Toggle Notes due 2027 
 The initial principal amount of this Global Note is      DOLLARS
($[            ]). The following increases or decreases in this Global Note have been made: 
  

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

  

	13/ 	 Include if a global note. 



  
 A-11 












 ATTACHMENT 1 

[FORM OF NOTICE OF CONVERSION] 

Aspen Aerogels, Inc. 
 Convertible
Senior PIK Toggle Notes due 2027 
  

	To:	 Aspen Aerogels, Inc. 



30 Forbes Road, Building B 

Northborough, MA 01532 
  

	[cc:	 [Trustee Name] 



[Trustee Address]] 
 The
undersigned registered owner of this Note hereby exercises the option to convert this Note, or the portion hereof (that is $1,000 principal amount or an integral multiple of $1.00 in excess thereof) below designated, into cash, shares of Common
Stock or a combination of cash and shares of Common Stock, as applicable, in accordance with the terms of the Indenture referred to in this Note, and directs that any cash payable and any shares of Common Stock issuable and deliverable upon such
conversion, together with any cash for any fractional share, and any Notes representing any unconverted principal amount hereof, be issued and delivered to the registered Holder hereof unless a different name has been indicated below. If any shares
of Common Stock or any portion of this Note not converted are to be issued in the name of a Person other than the undersigned, the undersigned will pay all documentary, stamp or similar issue or transfer taxes, if any in accordance with
Section 14.02(d) and Section 14.02(e) of the Indenture. Any amount required to be paid to the undersigned on account of interest accompanies this Note. Capitalized terms used herein but not defined shall have the meanings ascribed to such
terms in the Indenture. 
  

									
	Dated:	 	
                     

	 		 	  

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


  
 A-12 













									
	 be issued, or Notes are to be delivered, other than to and in the name of the registered holder.

 
 Fill in for registration of shares if to be issued, and Notes if to be delivered, other
than to and in the name of the registered holder:
	 		 		 	
				
	  
 (Name)
	 		 		 	
				
	  
 (Street
Address)
	 		 		 	
				
	  
 (City, State and Zip
Code)
	 		 		 	
	Please print name and address	 		 		 	

  

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

	Social Security or Other Taxpayer
	Identification Number



  
 A-13 












 ATTACHMENT 2 

[FORM OF FUNDAMENTAL CHANGE REPURCHASE NOTICE] 

Aspen Aerogels, Inc. 
 Convertible
Senior PIK Toggle Notes due 2027 
  

	To:	 Aspen Aerogels, Inc. 



30 Forbes Road, Building B 

Northborough, MA 01532 
  

	[cc:	 [Trustee Name] 



[Trustee Address]] 
 The
undersigned registered owner of this Note hereby acknowledges receipt of a notice from Aspen Aerogels, Inc. (the “Company”) as to the occurrence of a Fundamental Change with respect to the Company and specifying the Fundamental
Change Repurchase Date and requests and instructs the Company to pay to the registered holder hereof in accordance with Section 15.02 of the Indenture referred to in this Note the applicable Fundamental Change Repurchase Price. Capitalized
terms used herein but not defined shall have the meanings ascribed to such terms in the Indenture. 
 In the case of Physical Notes, the
certificate numbers of the Notes to be repurchased are as set forth below: 
  

			
	Dated:	 	  

	
	  

	Signature(s)

  

	
	  
 Social Security or Other
Taxpayer

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



  
 A-14 












 ATTACHMENT 3 

[FORM OF ASSIGNMENT AND TRANSFER] 

Aspen Aerogels, Inc. 
 Convertible
Senior PIK Toggle Notes due 2027 
 For value received _______________________ hereby sell(s), assign(s) and transfer(s) unto ______________________________
(Please insert social security or Taxpayer Identification Number of assignee) the within Note, and hereby irrevocably constitutes and appoints ______________________attorney to transfer the said Note on the books of the Company, with full power of
substitution in the premises. 
 In connection with any transfer of the within Note, the undersigned confirms that such Note is being transferred: 

☐    To Aspen Aerogels, Inc. or a subsidiary thereof; or 

☐    Pursuant to a registration statement that has become or been declared effective under the Securities Act of 1933, as amended;
or 
 ☐    Pursuant to and in compliance with Rule 144 under the Securities Act of 1933, as amended, or any other available
exemption from the registration requirements of the Securities Act of 1933, as amended. 
  

			
	Dated:	 	  

	
	  

	
	  

	Signature(s)
	
	  

	Signature Guarantee
	
	Signature(s) must be guaranteed by an eligible Guarantor Institution (banks, stock brokers, savings and loan associations and credit unions) with membership in an approved signature guarantee medallion program pursuant
to Securities and Exchange Commission Rule 17Ad-15 if Notes are to be delivered, other than to and in the name of the registered holder.


  
 A-15 












 NOTICE: The signature on the assignment must correspond with the name as written upon the face of the Note
in every particular without alteration or enlargement or any change whatever. 
 [EXHIBIT A – FORM OF INDENTURE]14/ 
  

	14/ 	 Include for notes issued prior to Indenture execution. 



  
 A-16