Document:

Indenture, dated as of July 5, 2012

 Exhibit 4.1 
 GEVO, INC. 
 SENIOR DEBT SECURITIES 

INDENTURE 

Dated as of July 5, 2012 
 WELLS FARGO BANK, NATIONAL ASSOCIATION 
 as Trustee 

 TABLE OF CONTENTS 

 

					
	 	  	Page	 
		
	 ARTICLE 1 DEFINITIONS
	  	 	1	  
		
	 SECTION 1.01 DEFINITIONS OF TERMS.
	  	 	1	  
		
	 ARTICLE 2 ISSUE, DESCRIPTION, TERMS, EXECUTION, REGISTRATION AND EXCHANGE OF SECURITIES
	  	 	4	  
		
	 SECTION 2.01 DESIGNATION AND TERMS OF
SECURITIES.
	  	 	4	  
	 SECTION 2.02 FORM OF SECURITIES AND
TRUSTEE’S CERTIFICATE.
	  	 	5	  
	 SECTION 2.03 DENOMINATIONS: PROVISIONS FOR
PAYMENT.
	  	 	6	  
	 SECTION 2.04 EXECUTION AND AUTHENTICATIONS.
	  	 	7	  
	 SECTION 2.05 REGISTRATION OF TRANSFER AND
EXCHANGE.
	  	 	7	  
	 SECTION 2.06 TEMPORARY SECURITIES.
	  	 	8	  
	 SECTION 2.07 MUTILATED, DESTROYED, LOST OR
STOLEN SECURITIES.
	  	 	8	  
	 SECTION 2.08 CANCELLATION.
	  	 	9	  
	 SECTION 2.09 BENEFITS OF INDENTURE.
	  	 	9	  
	 SECTION 2.10 AUTHENTICATING AGENT.
	  	 	9	  
	 SECTION 2.11 GLOBAL SECURITIES.
	  	 	10	  
		
	 ARTICLE 3 REDEMPTION OF SECURITIES AND SINKING FUND PROVISIONS
	  	 	10	  
		
	 SECTION 3.01 REDEMPTION.
	  	 	10	  
	 SECTION 3.02 NOTICE OF REDEMPTION.
	  	 	11	  
	 SECTION 3.03 PAYMENT UPON REDEMPTION.
	  	 	11	  
	 SECTION 3.04 SINKING FUND.
	  	 	12	  
	 SECTION 3.05 SATISFACTION OF SINKING FUND
PAYMENTS WITH SECURITIES.
	  	 	12	  
	 SECTION 3.06 REDEMPTION OF SECURITIES FOR
SINKING FUND.
	  	 	12	  
		
	 ARTICLE 4 COVENANTS
	  	 	12	  
		
	 SECTION 4.01 PAYMENT OF PRINCIPAL, PREMIUM
AND INTEREST.
	  	 	12	  
	 SECTION 4.02 MAINTENANCE OF OFFICE OR
AGENCY.
	  	 	13	  
	 SECTION 4.03 PAYING AGENTS.
	  	 	13	  
	 SECTION 4.04 APPOINTMENT TO FILL VACANCY
IN OFFICE OF TRUSTEE.
	  	 	14	  
	 SECTION 4.05 COMPLIANCE WITH CONSOLIDATION
PROVISIONS.
	  	 	14	  
		
	 ARTICLE 5 SECURITYHOLDERS’ LISTS AND REPORTS BY THE COMPANY AND THE TRUSTEE
	  	 	14	  
		
	 SECTION 5.01 COMPANY TO FURNISH TRUSTEE
NAMES AND ADDRESSES OF SECURITYHOLDERS.
	  	 	14	  
	 SECTION 5.02 PRESERVATION OF INFORMATION;
COMMUNICATIONS WITH SECURITYHOLDERS.
	  	 	14	  
	 SECTION 5.03 REPORTS BY THE COMPANY.
	  	 	15	  
	 SECTION 5.04 REPORTS BY THE TRUSTEE.
	  	 	15	  
		
	 ARTICLE 6 REMEDIES OF THE TRUSTEE AND SECURITYHOLDERS ON EVENT OF DEFAULT
	  	 	15	  
		
	 SECTION 6.01 EVENTS OF DEFAULT.
	  	 	15	  
	 SECTION 6.02 COLLECTION OF INDEBTEDNESS AND
SUITS FOR ENFORCEMENT BY TRUSTEE.
	  	 	17	  
	 SECTION 6.03 APPLICATION OF MONEYS
COLLECTED.
	  	 	18	  
	 SECTION 6.04 LIMITATION ON SUITS.
	  	 	18	  
	 SECTION 6.05 RIGHTS AND REMEDIES CUMULATIVE;
DELAY OR OMISSION NOT WAIVER.
	  	 	19	  
	 SECTION 6.06 CONTROL BY SECURITYHOLDERS.
	  	 	19	  
	 SECTION 6.07 UNDERTAKING TO PAY COSTS.
	  	 	19	  
		
	 ARTICLE 7 CONCERNING THE TRUSTEE
	  	 	20	  
		
	 SECTION 7.01 CERTAIN DUTIES AND RESPONSIBILITIES
OF TRUSTEE.
	  	 	20	  
	 SECTION 7.02 CERTAIN RIGHTS OF
TRUSTEE.
	  	 	20	  
	 SECTION 7.03 TRUSTEE NOT RESPONSIBLE FOR
RECITALS OR ISSUANCE OR SECURITIES.
	  	 	22	  
	 SECTION 7.04 MAY HOLD SECURITIES.
	  	 	22	  

  
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 TABLE OF CONTENTS 

(continued) 
  

					
	 	  	Page	 
		
	 SECTION 7.05 MONEYS HELD IN TRUST.
	  	 	22	  
	 SECTION 7.06 COMPENSATION AND REIMBURSEMENT.
	  	 	22	  
	 SECTION 7.07 RELIANCE ON OFFICERS’
CERTIFICATE.
	  	 	23	  
	 SECTION 7.08 DISQUALIFICATION; CONFLICTING INTERESTS.
	  	 	23	  
	 SECTION 7.09 CORPORATE TRUSTEE REQUIRED;
ELIGIBILITY.
	  	 	23	  
	 SECTION 7.10 RESIGNATION AND REMOVAL; APPOINTMENT
OF SUCCESSOR.
	  	 	23	  
	 SECTION 7.11 ACCEPTANCE OF APPOINTMENT BY
SUCCESSOR.
	  	 	24	  
	 SECTION 7.12 MERGER, CONVERSION, CONSOLIDATION OR
SUCCESSION TO BUSINESS.
	  	 	25	  
	 SECTION 7.13 PREFERENTIAL COLLECTION OF CLAIMS
AGAINST THE COMPANY.
	  	 	25	  
	 SECTION 7.14 NOTICE OF DEFAULT
	  	 	25	  
		
	 ARTICLE 8 CONCERNING THE SECURITYHOLDERS
	  	 	26	  
		
	 SECTION 8.01 EVIDENCE OF ACTION BY
SECURITYHOLDERS.
	  	 	26	  
	 SECTION 8.02 PROOF OF EXECUTION BY
SECURITYHOLDERS.
	  	 	26	  
	 SECTION 8.03 WHO MAY BE DEEMED
OWNERS.
	  	 	26	  
	 SECTION 8.04 CERTAIN SECURITIES OWNED BY
COMPANY DISREGARDED.
	  	 	27	  
	 SECTION 8.05 ACTIONS BINDING ON FUTURE
SECURITYHOLDERS.
	  	 	27	  
		
	 ARTICLE 9 SUPPLEMENTAL INDENTURES
	  	 	27	  
		
	 SECTION 9.01 SUPPLEMENTAL INDENTURES WITHOUT THE
CONSENT OF SECURITYHOLDERS.
	  	 	27	  
	 SECTION 9.02 SUPPLEMENTAL INDENTURES WITH CONSENT
OF SECURITYHOLDERS.
	  	 	28	  
	 SECTION 9.03 EFFECT OF SUPPLEMENTAL
INDENTURES.
	  	 	29	  
	 SECTION 9.04 SECURITIES AFFECTED BY SUPPLEMENTAL
INDENTURES.
	  	 	29	  
	 SECTION 9.05 EXECUTION OF SUPPLEMENTAL
INDENTURES.
	  	 	29	  
		
	 ARTICLE 10 SUCCESSOR ENTITY
	  	 	30	  
		
	 SECTION 10.01 COMPANY MAY CONSOLIDATE,
ETC.
	  	 	30	  
	 SECTION 10.02 SUCCESSOR ENTITY SUBSTITUTED.
	  	 	30	  
	 SECTION 10.03 EVIDENCE OF CONSOLIDATION, ETC.
TO TRUSTEE.
	  	 	30	  
		
	 ARTICLE 11 SATISFACTION AND DISCHARGE
	  	 	31	  
		
	 SECTION 11.01 SATISFACTION AND DISCHARGE OF
INDENTURE.
	  	 	31	  
	 SECTION 11.02 DISCHARGE OF OBLIGATIONS.
	  	 	31	  
	 SECTION 11.03 DEPOSITED MONEYS TO BE
HELD IN TRUST.
	  	 	31	  
	 SECTION 11.04 PAYMENT OF MONEYS HELD BY
PAYING AGENTS.
	  	 	31	  
	 SECTION 11.05 REPAYMENT TO COMPANY.
	  	 	32	  
		
	 ARTICLE 12 IMMUNITY OF INCORPORATORS, STOCKHOLDERS, OFFICERS AND DIRECTORS
	  	 	32	  
		
	 SECTION 12.01 NO RECOURSE.
	  	 	32	  
		
	 ARTICLE 13 MISCELLANEOUS PROVISIONS
	  	 	32	  
		
	 SECTION 13.01 EFFECT ON SUCCESSORS AND
ASSIGNS.
	  	 	32	  
	 SECTION 13.02 ACTIONS BY SUCCESSOR.
	  	 	32	  
	 SECTION 13.03 SURRENDER OF COMPANY
POWERS.
	  	 	33	  
	 SECTION 13.04 NOTICES.
	  	 	33	  
	 SECTION 13.05 GOVERNING LAW.
	  	 	33	  
	 SECTION 13.06 TREATMENT OF SECURITIES AS
DEBT.
	  	 	33	  
	 SECTION 13.07 CERTIFICATES AND OPINIONS AS
TO CONDITIONS PRECEDENT.
	  	 	33	  
	 SECTION 13.08 PAYMENTS ON BUSINESS
DAYS.
	  	 	33	  
	 SECTION 13.09 CONFLICT WITH TRUST INDENTURE
ACT.
	  	 	34	  
	 SECTION 13.10 COUNTERPARTS.
	  	 	34	  
	 SECTION 13.11 SEPARABILITY.
	  	 	34	  

  
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 TABLE OF CONTENTS 

(continued) 
  

					
	 	  	Page	 
		
	 SECTION 13.12 COMPLIANCE CERTIFICATES.
	  	 	34	  
	 SECTION 13.13 U.S.A. PATRIOT ACT.
	  	 	34	  
	 SECTION 13.14 FORCE MAJEURE.
	  	 	34	  

  
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 INDENTURE 
 INDENTURE, dated as of July 5, 2012, between GEVO, INC., a Delaware corporation (the “Company”), and WELLS FARGO BANK, NATIONAL ASSOCIATION, as trustee (the
“Trustee”): 
 WHEREAS, for its lawful corporate purposes, the Company has duly authorized the execution and
delivery of this Indenture to provide for the issuance of debt securities (hereinafter referred to as the “Securities”), in an unlimited aggregate principal amount to be issued from time to time in one or more series as in this Indenture
provided, as registered Securities without coupons, to be authenticated by the certificate of the Trustee; 
 WHEREAS, to
provide the terms and conditions upon which the Securities are to be authenticated, issued and delivered, the Company has duly authorized the execution of this Indenture; and 
 WHEREAS, all things necessary to make this Indenture a valid agreement of the Company, in accordance with its terms, have been done. 

NOW, THEREFORE, in consideration of the premises and the purchase of the Securities by the holders thereof, it is mutually
covenanted and agreed as follows for the equal and ratable benefit of the holders of Securities: 
 ARTICLE 1 

DEFINITIONS 
 Section 1.01 Definitions of Terms. 
 The terms defined in this Section
(except as in this Indenture or any indenture supplemental hereto 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 and shall include the plural as well as the singular. All other terms used in this Indenture that are defined in the Trust Indenture Act of 1939, as amended, or that are by reference in such Act defined in the
Securities Act of 1933, as amended (except as herein or any indenture supplemental hereto otherwise expressly provided or unless the context otherwise requires), shall have the meanings assigned to such terms in said Trust Indenture Act and in
said Securities Act as in force at the date of the execution of this instrument. 
 “Authenticating
Agent” means an authenticating agent with respect to all or any of the series of Securities appointed by the Trustee pursuant to Section 2.10. 
 “Bankruptcy Law” means Title 11, U.S. Code, or any similar federal or state law for the relief of debtors. 

“Board of Directors” means the Board of Directors of the Company or any duly authorized committee of such Board.

 “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. 
 “Business Day” means, with respect to any series of Securities, any day other than a day on which federal or state banking institutions in the Borough of Manhattan, the City of New
York, or in the city of the Corporate Trust Office of the Trustee, are authorized or obligated by law, executive order or regulation to close. 
 “Certificate” means a certificate signed by any Officer. The Certificate need not comply with the provisions of Section 13.07. 

“Company” means Gevo, Inc., a corporation duly organized and existing under the laws of the State of Delaware,
and, subject to the provisions of Article Ten, shall also include its successors and assigns. 

  
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 “Corporate Trust Office” means the office of the Trustee at which,
at any particular time, its corporate trust business shall be principally administered, which office at the date hereof is located at 707 Wilshire Blvd., 17th Flr., MAC# E2818-176, Los Angeles, CA 90017, Attn: Administrator for Gevo, Inc. with
respect to presentation of notes or for registration of transfer or exchange of notes, 608 2nd Ave., S. Minneapolis, MN 55479, Attn: Bondholder Communications. 
 “Custodian” means any receiver, trustee, assignee, liquidator or similar official under any Bankruptcy Law. 

“Default” means any event, act or condition that with notice or lapse of time, or both, would constitute an Event
of Default. 
 “Depositary” means, with respect to Securities of any series for which the Company shall
determine that such Securities will be issued as a Global Security, The Depository Trust Company, New York, New York, another clearing agency, or any successor registered as a clearing agency under the Securities and Exchange Act of 1934, as
amended (the “Exchange Act”), or other applicable statute or regulation, which, in each case, shall be designated by the Company pursuant to either Section 2.01 or 2.11. 

“Defaulted Interest” has the meaning set forth in Section 2.03. 

“Event of Default” means, with respect to Securities of a particular series, any event specified in
Section 6.01, continued for the period of time, if any, therein designated. 
 “Global Security”
means, with respect to any series of Securities, a Security executed by the Company and delivered by the Trustee to the Depositary or pursuant to the Depositary’s instruction, all in accordance with the Indenture, which shall be registered in
the name of the Depositary or its nominee. 
 “Governmental Obligations” means securities that are
(a) direct obligations of the United States of America for the payment of which its full faith and credit is pledged or (b) obligations of a Person controlled or supervised by and acting as an agency or instrumentality of the United States
of America, the payment of which is unconditionally guaranteed as a full faith and credit obligation by the United States of America that, in either case, are not callable or redeemable at the option of the issuer thereof at any time prior to the
stated maturity of the Securities, and shall also include a depositary receipt issued by a bank or trust company as custodian with respect to any such Governmental Obligation or a specific payment of principal of or interest on any such Governmental
Obligation held by such custodian for the account of the holder of such depositary receipt; provided, however, that (except as required by law) such custodian is not authorized to make any deduction from the amount payable to the holder of such
depositary receipt from any amount received by the custodian in respect of the Governmental Obligation or the specific payment of principal of or interest on the Governmental Obligation evidenced by such depositary receipt. 

“herein”, “hereof” and “hereunder”, and other words of similar
import, refer to this Indenture as a whole and not to any particular Article, Section or other subdivision. 

“Indenture” means this instrument as originally executed or as it may from time to time be supplemented or
amended by one or more indentures supplemental hereto entered into in accordance with the terms hereof. 
 “Interest
Payment Date”, when used with respect to any installment of interest on a Security of a particular series, means the date specified in such Security or in a Board Resolution or in an indenture supplemental hereto with respect to such
series as the fixed date on which an installment of interest with respect to Securities of that series is due and payable. 

“Officer” means, with respect to the Company, the chairman of the Board of Directors, a chief executive officer,
a president, a chief financial officer, a chief operating officer, any executive vice president, any senior vice president, any vice president, the treasurer or any assistant treasurer, the controller or any assistant controller or the secretary or
any assistant secretary. 

  
 -2-

 “Officers’ Certificate” means a certificate signed by any two
Officers. Each such certificate shall include the statements provided for in Section 13.07, if and to the extent required by the provisions thereof. 
 “Opinion of Counsel” means an opinion in writing subject to customary exceptions of legal counsel, who may be an employee of or counsel for the Company, that is delivered to the
Trustee in accordance with the terms hereof. Each such opinion shall include the statements provided for in Section 13.07, if and to the extent required by the provisions thereof. 

“Outstanding”, when used with reference to Securities of any series, means, subject to the provisions of
Section 8.04, as of any particular time, all Securities of that series theretofore authenticated and delivered by the Trustee under this Indenture, except (a) Securities theretofore canceled by the Trustee or any paying agent, or delivered
to the Trustee or any paying agent for cancellation or that have previously been canceled; (b) Securities or portions thereof for the payment or redemption of which moneys or Governmental Obligations 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); provided, however, that if such Securities
or portions of such Securities are to be redeemed prior to the maturity thereof, notice of such redemption shall have been given as in Article Three provided, or provision satisfactory to the Trustee shall have been made for giving such notice; and
(c) Securities in lieu of or in substitution for which other Securities shall have been authenticated and delivered pursuant to the terms of Section 2.07. 
 “Person” means any individual, corporation, partnership, joint venture, joint-stock company, limited liability company, association, trust, unincorporated organization, any other
entity or organization, including a government or political subdivision or an agency or instrumentality thereof. 

“Predecessor Security” of any particular Security means every previous Security evidencing all or a portion of
the same debt as that evidenced by such particular Security; and, for the purposes of this definition, any Security authenticated and delivered under Section 2.07 in lieu of a lost, destroyed or stolen Security shall be deemed to evidence the
same debt as the lost, destroyed or stolen Security. 
 “Responsible Officer” when used with respect to
the Trustee means any trust officer, any corporate trust officer including any vice president or assistant vice president of the Trustee customarily performing 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 his or her knowledge of and familiarity with the particular subject. 
 “Securities” means the debt Securities authenticated and delivered under this Indenture. 
 “Securityholder” , “holder of Securities”, “registered holder”, or other similar term, means the Person or Persons in whose name or
names a particular Security shall be registered on the books of the Company kept for that purpose in accordance with the terms of this Indenture. 
 “Security Register” and “Security Registrar” shall have the meanings as set forth in Section 2.05. 

“Subsidiary” means, with respect to any Person, (i) any corporation at least a majority of whose outstanding
Voting Stock shall at the time be owned, directly or indirectly, by such Person or by one or more of its Subsidiaries or by such Person and one or more of its Subsidiaries, (ii) any general partnership, joint venture or similar entity, at least
a majority of whose outstanding partnership or similar interests shall at the time be owned by such Person, or by one or more of its Subsidiaries, or by such Person and one or more of its Subsidiaries and (iii) any limited partnership of which
such Person or any of its Subsidiaries is a general partner. 
 “Trustee” means Wells Fargo Bank,
National Association, and, subject to the provisions of Article Seven, shall also include its successors and assigns, and, if at any time there is more than one Person acting in such capacity hereunder, “Trustee” shall mean each such
Person. The term “Trustee” as used with respect to a particular series of the Securities shall mean the trustee with respect to that series. 
 “Trust Indenture Act” means the Trust Indenture Act of 1939, as amended. 

  
 -3-

 “Voting Stock”, as applied to stock of any Person, means shares,
interests, participations or other equivalents in the equity interest (however designated) in such Person having ordinary voting power for the election of a majority of the directors (or the equivalent) of such Person, other than shares, interests,
participations or other equivalents having such power only by reason of the occurrence of a contingency. 
 ARTICLE 2

 ISSUE, DESCRIPTION, TERMS, EXECUTION, REGISTRATION 

AND EXCHANGE OF SECURITIES 
 Section 2.01 Designation and Terms of Securities. 
 (a)
The aggregate principal amount of Securities that may be authenticated and delivered under this Indenture is unlimited. The Securities may be issued in one or more series up to the aggregate principal amount of Securities of that series from
time to time authorized by or pursuant to a Board Resolution or pursuant to one or more indentures supplemental hereto. Prior to the initial issuance of Securities of any series, there shall be established in or pursuant to a Board Resolution, and
set forth in an Officers’ Certificate, or established in one or more indentures supplemental hereto: 
 (1) the
title of the Securities of the series (which shall distinguish the Securities of that series from all other Securities); 

(2) any limit upon the aggregate principal amount of the Securities of that series that may be authenticated and delivered under
this Indenture (except for Securities authenticated and delivered upon registration of transfer of, or in exchange for, or in lieu of, other Securities of that series); 
 (3) the date or dates on which the principal of the Securities of the series is payable, any original issue discount that may apply to the Securities of that series upon their issuance, the
principal amount due at maturity, and the place(s) of payment; 
 (4) the rate or rates at which the Securities of the
series shall bear interest or the manner of calculation of such rate or rates, if any; 
 (5) the date or dates from
which such interest shall accrue, the Interest Payment Dates on which such interest will be payable or the manner of determination of such Interest Payment Dates, the place(s) of payment, and the record date for the determination of holders to whom
interest is payable on any such Interest Payment Dates or the manner of determination of such record dates; 
 (6) the
right, if any, to extend the interest payment periods and the duration of such extension; 
 (7) the period or periods
within which, the price or prices at which and the terms and conditions upon which Securities of the series may be redeemed, in whole or in part, at the option of the Company; 
 (8) the obligation, if any, of the Company to redeem or purchase Securities of the series pursuant to any sinking fund, mandatory redemption, or analogous provisions (including payments made in
cash in satisfaction of future sinking fund obligations) or at the option of a holder thereof and the period or periods within which, the price or prices at which, and the terms and conditions upon which, Securities of the series shall be redeemed
or purchased, in whole or in part, pursuant to such obligation; 
 (9) the form of the Securities of the series including
the form of the Certificate of Authentication for such series; 
 (10) if other than denominations of one thousand
U.S. dollars ($1,000) or any integral multiple thereof, the denominations in which the Securities of the series shall be issuable; 

  
 -4-

 (11) any and all other terms (including terms, to the extent applicable, relating to
any auction or remarketing of the Securities of that series and any security for the obligations of the Company with respect to such Securities) with respect to such series (which terms shall not be inconsistent with the terms of this Indenture, as
amended by any supplemental indenture) including any terms which may be required by or advisable under United States laws or regulations or advisable in connection with the marketing of Securities of that series; 

(12) whether the Securities are issuable as a Global Security and, in such case, the terms and the identity of the Depositary for
such series; 
 (13) whether the Securities will be convertible into or exchangeable for shares of common stock or other
securities of the Company or any other Person and, if so, the terms and conditions upon which such Securities will be so convertible or exchangeable, including the conversion or exchange price, as applicable, or how it will be calculated and may be
adjusted, any mandatory or optional (at the Company’s option or the holders’ option) conversion or exchange features, and the applicable conversion or exchange period; 

(14) if other than the principal amount thereof, the portion of the principal amount of Securities of the series which shall be
payable upon declaration of acceleration of the maturity thereof pursuant to Section 6.01; 
 (15) any additional or
different Events of Default or restrictive covenants (which may include, among other restrictions, restrictions on the Company’s ability or the ability of the Company’s Subsidiaries to: incur additional indebtedness; issue additional
securities; create liens; pay dividends or make distributions in respect of their capital stock; redeem capital stock; place restrictions on such Subsidiaries placing restrictions on their ability to pay dividends, make distributions or transfer
assets; make investments or other restricted payments; sell or otherwise dispose of assets; enter into sale-leaseback transactions; engage in transactions with stockholders and affiliates; issue or sell stock of their Subsidiaries; or effect a
consolidation or merger) or financial covenants (which may include, among other financial covenants, financial covenants that require the Company and its Subsidiaries to maintain specified interest coverage, fixed charge, cash flow-based or
asset-based ratios) provided for with respect to the Securities of the series; 
 (16) if other than dollars, the coin or
currency in which the Securities of the series are denominated (including, but not limited to, foreign currency); 
 (17)
the terms and conditions, if any, upon which the Company shall pay amounts in addition to the stated interest, premium, if any and principal amounts of the Securities of the series to any Securityholder that is not a “United States
person” for federal tax purposes; and 
 (18) any restrictions on transfer, sale or assignment of the Securities of
the series. 
 All Securities of any one series shall be substantially identical except as to denomination and except as may
otherwise be provided in or pursuant to any such Board Resolution or in any indentures supplemental hereto. 
 If any of the
terms of the series are established by action taken pursuant to a Board Resolution of the Company, a copy of an appropriate record of such action shall be certified by the secretary or an assistant secretary of the Company and delivered to the
Trustee at or prior to the delivery of the Officers’ Certificate of the Company setting forth the terms of the series. 

Securities of any particular series may be issued at various times, with different dates on which the principal or any installment of
principal is payable, with different rates of interest, if any, or different methods by which rates of interest may be determined, with different dates on which such interest may be payable and with different redemption dates. 

Section 2.02 Form of Securities and Trustee’s Certificate. 

The Securities of any series and the Trustee’s certificate of authentication to be borne by such Securities shall be substantially
of the tenor and purport as set forth in one or more indentures supplemental hereto or as 

  
 -5-

 
provided in a Board Resolution, and set forth in an Officers’ Certificate, and they may have such letters, numbers or other marks of identification or designation and such legends or
endorsements printed, lithographed or engraved thereon as the Company may deem appropriate 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 on which Securities of that series may be listed, or to conform to usage. 
 Section 2.03 Denominations: Provisions for Payment. 
 The
Securities shall be issuable as registered Securities and in the denominations of one thousand U.S. dollars ($1,000) or any integral multiple thereof, subject to Section 2.01(a)(10). The Securities of a particular series shall bear
interest payable on the dates and at the rate specified with respect to that series. Subject to Section 2.01(a)(16), the principal of and the interest on the Securities of any series, as well as any premium thereon in case of redemption thereof
prior to maturity, shall be payable in the coin or currency of the United States of America that at the time is legal tender for public and private debt, at the office or agency of the Company maintained for that purpose in Minneapolis, MN. Each
Security shall be dated the date of its authentication. Interest on the Securities shall be computed on the basis of a 360-day year composed of twelve 30-day months. 
 The interest installment on any Security that is payable, and is punctually paid or duly provided for, on any Interest Payment Date for Securities of that series shall be paid to the Person in whose name
said Security (or one or more Predecessor Securities) is registered at the close of business on the regular record date for such interest installment. In the event that any Security of a particular series or portion thereof is called for redemption
and the redemption date is subsequent to a regular record date with respect to any Interest Payment Date and prior to such Interest Payment Date, interest on such Security will be paid upon presentation and surrender of such Security as provided in
Section 3.03. 
 Any interest on any Security that is payable, but is not punctually paid or duly provided for, on any
Interest Payment Date for Securities of the same series (herein called “Defaulted Interest”) shall forthwith cease to be payable to the registered holder on the relevant regular record date by virtue of having been such holder; and such
Defaulted Interest shall be paid by the Company, at its election, as provided in clause (1) or clause (2) below: 
 (1) The Company may make payment of any Defaulted Interest on Securities to the Persons in whose names such Securities (or their respective Predecessor Securities) are registered at the close of
business on a special record date for the payment of such Defaulted Interest, which shall be fixed in the following manner: the Company shall notify the Trustee in writing of the amount of Defaulted Interest proposed to be paid on each such Security
and the date of the proposed payment, and at the same time the Company shall deposit with the Trustee an amount of money equal to the aggregate amount proposed to be paid in respect of such Defaulted Interest or shall make arrangements satisfactory
to the Trustee for such deposit prior to the date of the proposed payment, such money when deposited to be held in trust for the benefit of the Persons entitled to such Defaulted Interest as in this clause provided. Thereupon the Trustee shall fix a
special record date for the payment of such Defaulted Interest which shall not be more than 15 nor 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 Trustee shall promptly notify the Company of such special record date and, in the name and at the expense of the Company, shall cause notice of the proposed payment of such Defaulted Interest and the special
record date therefor to be mailed, first class postage prepaid, or electronic facsimile in the case of book entry, to each Securityholder at his or her address as it appears in the Security Register (as hereinafter defined), not less
than 10 days prior to such special record date. Notice of the proposed payment of such Defaulted Interest and the special record date therefor having been mailed as aforesaid, such Defaulted Interest shall be paid to the Persons in whose
names such Securities (or their respective Predecessor Securities) are registered on such special record date and shall be no longer payable pursuant to the following clause (2). 

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

  
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 Unless otherwise set forth in a Board Resolution or one or more indentures supplemental
hereto establishing the terms of any series of Securities pursuant to Section 2.01 hereof, the term “regular record date” as used in this Section with respect to a series of Securities and any Interest Payment Date for such series
shall mean either the fifteenth day of the month immediately preceding the month in which an Interest Payment Date established for such series pursuant to Section 2.01 hereof shall occur, if such Interest Payment Date is the first day of a
month, or the first day of the month in which an Interest Payment Date established for such series pursuant to Section 2.01 hereof shall occur, if such Interest Payment Date is the fifteenth day of a month, whether or not such date is a
Business Day. 
 Subject to the foregoing provisions of this Section, each Security of a series delivered under this Indenture
upon transfer of or in exchange for or in lieu of any other Security of such series shall carry the rights to interest accrued and unpaid, and to accrue, that were carried by such other Security. 

Section 2.04 Execution and Authentications. 
 The Securities shall be signed on behalf of the Company by one of its Officers. Signatures may be in the form of a manual or facsimile signature. 

The Company may use the facsimile signature of any Person who shall have been an Officer, notwithstanding the fact that at the time the
Securities shall be authenticated and delivered or disposed of such Person shall have ceased to be such an officer of the Company. The seal of the Company may be in the form of a facsimile of such seal and may be impressed, affixed, imprinted or
otherwise reproduced on the Securities. The Securities may contain such notations, legends or endorsements required by law, stock exchange rule or usage. Each Security shall be dated the date of its authentication by the Trustee. 

A Security shall not be valid until authenticated manually by an authorized signatory of the Trustee, or by an Authenticating Agent. Such
signature shall be conclusive evidence that the Security so authenticated has been duly authenticated and delivered hereunder and that the holder is entitled to the benefits of this Indenture. At any time and from time to time after the execution
and delivery of this Indenture, the Company may deliver Securities of any series executed by the Company to the Trustee for authentication, together with a written order of the Company for the authentication and delivery of such Securities, signed
by an Officer, and the Trustee in accordance with such written order shall authenticate and deliver such Securities. 
 In
authenticating such Securities and accepting the additional responsibilities under this Indenture in relation to such Securities, the Trustee shall be entitled to receive, and (subject to Section 7.01) shall be fully protected in relying upon,
an Opinion of Counsel stating that the form and terms thereof have been established in conformity with the provisions of this Indenture. 
 The Trustee shall not be required to authenticate such Securities if the issue of such Securities pursuant to this Indenture will affect the Trustee’s own rights, duties or immunities under the
Securities and this Indenture or otherwise in a manner that is not reasonably acceptable to the Trustee. 
 Section 2.05
Registration of Transfer and Exchange. 
 (a) Securities of any series may be exchanged upon presentation
thereof at the office or agency of the Company designated for such purpose in Minneapolis, MN, for other Securities of such series of authorized denominations, and for a like aggregate principal amount, upon payment of a sum sufficient to cover any
tax or other governmental charge in relation thereto, all as provided in this Section. In respect of any Securities so surrendered for exchange, the Company shall execute, the Trustee shall authenticate and such office or agency shall deliver in
exchange therefor the Security or Securities of the same series that the Securityholder making the exchange shall be entitled to receive, bearing numbers not contemporaneously outstanding. 

(b) The Company shall keep, or cause to be kept, at its office or agency designated for such purpose in Minneapolis, MN, or such
other location designated by the Company, a register or registers (herein referred to as the “Security Register”) in which, subject to such reasonable regulations as it may prescribe, the Company shall register

  
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the Securities and the transfers of Securities as in this Article provided and which at all reasonable times shall be open for inspection by the Trustee. The registrar for the purpose of
registering Securities and transfer of Securities as herein provided shall be appointed as authorized by Board Resolution (the “Security Registrar”). 
 Upon surrender for transfer of any Security at the office or agency of the Company designated for such purpose, the Company shall execute, the Trustee shall authenticate and such office or agency shall
deliver in the name of the transferee or transferees a new Security or Securities of the same series as the Security presented for a like aggregate principal amount. 
 All Securities presented or surrendered for exchange or registration of transfer, as provided in this Section, shall be accompanied (if so required by the Company or the Security Registrar) by a written
instrument or instruments of transfer, in form satisfactory to the Company or the Security Registrar, duly executed by the registered holder or by such holder’s duly authorized attorney in writing. 

(c) Except as provided pursuant to Section 2.01 pursuant to a Board Resolution, and set forth in an Officers’
Certificate, or established in one or more indentures supplemental to this Indenture, no service charge shall be made for any exchange or registration of transfer of Securities, or issue of new Securities in case of partial redemption of any series,
but the Company may require payment of a sum sufficient to cover any tax or other governmental charge in relation thereto, other than exchanges pursuant to Section 2.06, Section 3.03(b) and Section 9.04 not involving any
transfer. 
 (d) The Company shall not be required (i) to issue, exchange or register the transfer of any Securities
during a period beginning at the opening of business 15 days before the day of the mailing of a notice of redemption of less than all the Outstanding Securities of the same series and ending at the close of business on the day of such
mailing, nor (ii) to register the transfer of or exchange any Securities of any series or portions thereof called for redemption, other than the unredeemed portion of any such Securities being redeemed in part. The provisions of this
Section 2.05 are, with respect to any Global Security, subject to Section 2.11 hereof. 
 Section 2.06
Temporary Securities. 
 Pending the preparation of definitive Securities of any series, the Company may execute, and
the Trustee shall authenticate and deliver, temporary Securities (printed, lithographed or typewritten) of any authorized denomination. Such temporary Securities shall be substantially in the form of the definitive Securities in lieu of which they
are issued, but with such omissions, insertions and variations as may be appropriate for temporary Securities, all as may be determined by the Company. Every temporary Security of any series shall be executed by the Company and be authenticated by
the Trustee upon the same conditions and in substantially the same manner, and with like effect, as the definitive Securities of such series. Without unnecessary delay the Company will execute and will furnish definitive Securities of such series
and thereupon any or all temporary Securities of such series may be surrendered in exchange therefor (without charge to the holders), at the office or agency of the Company designated for the purpose in Minneapolis, MN, and the Trustee shall
authenticate and such office or agency shall deliver in exchange for such temporary Securities an equal aggregate principal amount of definitive Securities of such series, unless the Company advises the Trustee to the effect that definitive
Securities need not be executed and furnished until further notice from the Company. Until so exchanged, the temporary Securities of such series shall be entitled to the same benefits under this Indenture as definitive Securities of such series
authenticated and delivered hereunder. 
 Section 2.07 Mutilated, Destroyed, Lost or Stolen Securities.

 In case any temporary or definitive Security shall become mutilated or be destroyed, lost or stolen, the Company (subject
to the next succeeding sentence) shall execute, and upon the Company’s request the Trustee (subject as aforesaid) shall authenticate and deliver, a new Security of the same series, bearing a number not contemporaneously outstanding, in exchange
and substitution for the mutilated Security, or in lieu of and in substitution for the Security so destroyed, lost or stolen. In every case the applicant for a substituted Security shall furnish to the Company and the Trustee such security or
indemnity as may be required by them to save each of them harmless, and, in every case of destruction, loss or theft, the applicant shall also furnish to the Company and the Trustee evidence to their satisfaction of the destruction, loss or theft of
the applicant’s Security and of the ownership 

  
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thereof. The Trustee may authenticate any such substituted Security and deliver the same upon the written request or authorization of any officer of the Company. Upon the issuance of any
substituted Security, the Company may require the payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in relation thereto and any other expenses (including the fees and expenses of the Trustee) connected
therewith. 
 In case any Security that has matured or is about to mature shall become mutilated or be destroyed, lost or
stolen, the Company may, instead of issuing a substitute Security, pay or authorize the payment of the same (without surrender thereof except in the case of a mutilated Security) if the applicant for such payment shall furnish to the Company and the
Trustee such security or indemnity as they may require to save them harmless, and, in case of destruction, loss or theft, evidence to the satisfaction of the Company and the Trustee of the destruction, loss or theft of such Security and of the
ownership thereof. 
 Every replacement Security issued pursuant to the provisions of this Section shall constitute an
additional contractual obligation of the Company whether or not the mutilated, destroyed, lost or stolen Security shall be found at any time, or be enforceable by anyone, and shall be entitled to all the benefits of this Indenture equally and
proportionately with any and all other Securities of the same series duly issued hereunder. All Securities shall be held and owned upon the express condition that the foregoing provisions are exclusive with respect to the replacement or payment of
mutilated, destroyed, lost or stolen Securities, and shall preclude (to the extent lawful) any and all other rights or remedies, notwithstanding any law or statute existing or hereafter enacted to the contrary with respect to the replacement or
payment of negotiable instruments or other securities without their surrender. 
 Section 2.08 Cancellation.

 All Securities surrendered for the purpose of payment, redemption, exchange or registration of transfer shall, if
surrendered to the Company or any paying agent, be delivered to the Trustee for cancellation, or, if surrendered to the Trustee, shall be cancelled by it, and no Securities shall be issued in lieu thereof except as expressly required or permitted by
any of the provisions of this Indenture. On request of the Company at the time of such surrender, the Trustee shall deliver to the Company canceled Securities held by the Trustee. In the absence of such request the Trustee may dispose of canceled
Securities in accordance with its standard procedures and deliver a certificate of disposition to the Company. If the Company shall otherwise acquire any of the Securities, however, such acquisition shall not operate as a redemption or satisfaction
of the indebtedness represented by such Securities unless and until the same are delivered to the Trustee for cancellation. 

Section 2.09 Benefits of Indenture. 
 Nothing in this Indenture or in the Securities, express or implied, shall give or be construed to give to any Person, other than the parties hereto and the holders of the Securities any legal or equitable
right, remedy or claim under or in respect of this Indenture, or under any covenant, condition or provision herein contained; all such covenants, conditions and provisions being for the sole benefit of the parties hereto and of the holders of the
Securities. 
 Section 2.10 Authenticating Agent. 

So long as any of the Securities of any series remain Outstanding there may be an Authenticating Agent for any or all such series of
Securities which the Trustee shall have the right to appoint. Said Authenticating Agent shall be authorized to act on behalf of the Trustee to authenticate Securities of such series issued upon exchange, transfer or partial redemption thereof, and
Securities so authenticated shall be entitled to the benefits of this Indenture and shall be valid and obligatory for all purposes as if authenticated by the Trustee hereunder. All references in this Indenture to the authentication of Securities by
the Trustee shall be deemed to include authentication by an Authenticating Agent for such series. Each Authenticating Agent shall be acceptable to the Company and shall be a corporation that has a combined capital and surplus, as most recently
reported or determined by it, sufficient under the laws of any jurisdiction under which it is organized or in which it is doing business to conduct a trust business, and that is otherwise authorized under such laws to conduct such business and is
subject to supervision or examination by federal or state authorities. If at any time any Authenticating Agent shall cease to be eligible in accordance with these provisions, it shall resign immediately. 

  
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 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 (and upon request by the Company shall) terminate the agency of any Authenticating Agent by giving written notice of termination to such Authenticating Agent and to the Company. Upon
resignation, termination or cessation of eligibility of any Authenticating Agent, the Trustee may appoint an eligible successor Authenticating Agent acceptable to the Company. Any successor Authenticating Agent, upon acceptance of its appointment
hereunder, shall become vested with all the rights, powers and duties of its predecessor hereunder as if originally named as an Authenticating Agent pursuant hereto. 
 Section 2.11 Global Securities. 
 (a) If the Company
shall establish pursuant to Section 2.01 that the Securities of a particular series are to be issued as a Global Security, then the Company shall execute and the Trustee shall, in accordance with Section 2.04, authenticate and deliver, a
Global Security that (i) shall represent, and shall be denominated in an amount equal to the aggregate principal amount of, all of the Outstanding Securities of such series, (ii) shall be registered in the name of the Depositary or its
nominee, (iii) shall be delivered by the Trustee to the Depositary or pursuant to the Depositary’s instruction and (iv) shall bear a legend substantially to the following effect: “Except as otherwise provided in Section 2.11
of the Indenture, this Security may be transferred, in whole but not in part, only to another nominee of the Depositary or to a successor Depositary or to a nominee of such successor Depositary.” 

(b) Notwithstanding the provisions of Section 2.05, the Global Security of a series may be transferred, in whole but not in
part and in the manner provided in Section 2.05, only to another nominee of the Depositary for such series, or to a successor Depositary for such series selected or approved by the Company or to a nominee of such successor Depositary.

 (c) If at any time the Depositary for a series of the Securities notifies the Company that it is unwilling or unable
to continue as Depositary for such series or if at any time the Depositary for such series shall no longer be registered or in good standing under the Exchange Act, or other applicable statute or regulation, and a successor Depositary for such
series is not appointed by the Company within 90 days after the Company receives such notice or becomes aware of such condition, as the case may be, or if an Event of Default has occurred and is continuing and the Company has received a
request from the Depositary, this Section 2.11 shall no longer be applicable to the Securities of such series and the Company will execute, and subject to Section 2.04, the Trustee will authenticate and deliver the Securities of such
series in definitive registered form without coupons, in authorized denominations, and in an aggregate principal amount equal to the principal amount of the Global Security of such series in exchange for such Global Security. In addition, the
Company may at any time determine that the Securities of any series shall no longer be represented by a Global Security and that the provisions of this Section 2.11 shall no longer apply to the Securities of such series. In such event the
Company will execute and, subject to Section 2.04, the Trustee, upon receipt of an Officers’ Certificate evidencing such determination by the Company, will authenticate and deliver the Securities of such series in definitive registered
form without coupons, in authorized denominations, and in an aggregate principal amount equal to the principal amount of the Global Security of such series in exchange for such Global Security. Upon the exchange of the Global Security for such
Securities in definitive registered form without coupons, in authorized denominations, the Global Security shall be canceled by the Trustee. Such Securities in definitive registered form issued in exchange for the Global Security pursuant to this
Section 2.11(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, shall instruct the Trustee. The Trustee shall deliver
such Securities to the Depositary for delivery to the Persons in whose names such Securities are so registered. 
 ARTICLE 3

 REDEMPTION OF SECURITIES AND SINKING FUND PROVISIONS 

Section 3.01 Redemption. 
 The Company may redeem the Securities of any series issued hereunder on and after the dates and in accordance with the terms established for such series pursuant to Section 2.01 hereof. 

  
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 Section 3.02 Notice of Redemption. 

(a) In case the Company shall desire to exercise such right to redeem all or, as the case may be, a portion of the Securities of
any series in accordance with any right the Company reserved for itself to do so pursuant to Section 2.01 hereof, the Company shall, or shall cause the Trustee to, give notice of such redemption to holders of the Securities of such series to be
redeemed by mailing, first class postage prepaid, or electronic facsimile in the case of book entry, a notice of such redemption not less than 30 days and not more than 90 days before the date fixed for redemption of that series
to such holders at their last addresses as they shall appear upon the Security Register, unless a shorter period is specified in the Securities to be redeemed. Any notice that is mailed in the manner herein provided shall be conclusively presumed to
have been duly given, whether or not the registered holder receives the notice. In any case, failure duly to give such notice to the holder of any Security of any series designated for redemption in whole or in part, or any defect in the notice,
shall not affect the validity of the proceedings for the redemption of any other Securities of such series or any other series. In the case of any redemption of Securities prior to the expiration of any restriction on such redemption provided in the
terms of such Securities or elsewhere in this Indenture, the Company shall furnish the Trustee with an Officers’ Certificate evidencing compliance with any such restriction. 

Each such notice of redemption shall specify the date fixed for redemption and the redemption price at which Securities of that series
are to be redeemed, and shall state that payment of the redemption price of such Securities to be redeemed will be made at the office or agency of the Company in Minneapolis, MN, upon presentation and surrender of such Securities, that interest
accrued to the date fixed for redemption will be paid as specified in said notice, that from and after said date interest will cease to accrue and that the redemption is for a sinking fund, if such is the case. If less than all the Securities of a
series are to be redeemed, the notice to the holders of Securities of that series to be redeemed in part shall specify the particular Securities to be so redeemed. 
 In case any Security is to be redeemed in part only, the notice that relates to such Security shall state the portion of the principal amount thereof to be redeemed, and shall state that on and after the
redemption date, upon surrender of such Security, a new Security or Securities of such series in principal amount equal to the unredeemed portion thereof will be issued. 
 (b) If less than all the Securities of a series are to be redeemed, the Company shall give the Trustee at least 45 days’ notice (unless a shorter notice shall be satisfactory to the
Trustee) in advance of the date fixed for redemption as to the aggregate principal amount of Securities of the series to be redeemed, and thereupon the Trustee shall select, by lot or in such other manner as it shall deem appropriate and fair in its
discretion and that may provide for the selection of a portion or portions (equal to one thousand U.S. dollars ($1,000) or any integral multiple thereof) of the principal amount of such Securities of a denomination larger than $1,000, the
Securities to be redeemed and shall thereafter promptly notify the Company in writing of the numbers of the Securities to be redeemed, in whole or in part. The Company may, if and whenever it shall so elect, by delivery of instructions signed on its
behalf by an Officer, instruct the Trustee or any paying agent to call all or any part of the Securities of a particular series for redemption and to give notice of redemption in the manner set forth in this Section, such notice to be in the name of
the Company or its own name as the Trustee or such paying agent may deem advisable. In any case in which notice of redemption is to be given by the Trustee or any such paying agent, the Company shall deliver or cause to be delivered to, or permit to
remain with, the Trustee or such paying agent, as the case may be, such Security Register, transfer books or other records, or suitable copies or extracts therefrom, sufficient to enable the Trustee or such paying agent to give any notice by mail
that may be required under the provisions of this Section. 
 Section 3.03 Payment Upon Redemption.

 (a) If the giving of notice of redemption shall have been completed as above provided, the Securities or portions
of Securities of the series to be redeemed specified in such notice shall become due and payable on the date and at the place stated in such notice at the applicable redemption price, together with interest accrued to the date fixed for redemption
and interest on such Securities or portions of Securities shall cease to accrue on and after the date fixed for redemption, unless the Company shall default in the payment of such redemption price and accrued interest with respect to any such
Security or portion thereof. On presentation and surrender of such Securities on or after the date fixed for redemption at the place of payment specified in the notice, said Securities shall be paid and

  
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redeemed at the applicable redemption price for such series, together with interest accrued thereon to the date fixed for redemption (but if the date fixed for redemption is an interest payment
date, the interest installment payable on such date shall be payable to the registered holder at the close of business on the applicable record date pursuant to Section 2.03). 

(b) Upon presentation of any Security of such series that is to be redeemed in part only, the Company shall execute and the
Trustee shall authenticate and the office or agency where the Security is presented shall deliver to the holder thereof, at the expense of the Company, a new Security of the same series of authorized denominations in principal amount equal to the
unredeemed portion of the Security so presented. 
 Section 3.04 Sinking Fund. 

The provisions of Sections 3.04, 3.05 and 3.06 shall be applicable to any sinking fund for the retirement of Securities of a
series, except as otherwise specified as contemplated by Section 2.01 for Securities of such series. 
 The minimum amount
of any sinking fund payment provided for by the terms of Securities of any series is herein referred to as a “mandatory sinking fund payment,” and any payment in excess of such minimum amount provided for by the terms of Securities of any
series is herein referred to as an “optional sinking fund payment”. If provided for by the terms of Securities of any series, the cash amount of any sinking fund payment may be subject to reduction as provided in Section 3.05. Each
sinking fund payment shall be applied to the redemption of Securities of any series as provided for by the terms of Securities of such series. 
 Section 3.05 Satisfaction of Sinking Fund Payments with Securities. 
 The Company (i) may deliver Outstanding Securities of a series and (ii) may apply as a credit Securities of a series that have been redeemed either at the election of the Company pursuant to the
terms of such Securities or through the application of permitted optional sinking fund payments pursuant to the terms of such Securities, in each case in satisfaction of all or any part of any sinking fund payment with respect to the Securities of
such series required to be made pursuant to the terms of such Securities as provided for by the terms of such series, provided that such Securities have not been previously so credited. Such Securities shall be received and credited for such purpose
by the Trustee at the redemption price specified in such Securities for redemption through operation of the sinking fund and the amount of such sinking fund payment shall be reduced accordingly. 

Section 3.06 Redemption of Securities for Sinking Fund. 

Not less than 45 days prior to each sinking fund payment date for any series of Securities (unless a shorter period shall be
satisfactory to the Trustee), the Company will deliver to the Trustee an Officers’ Certificate specifying the amount of the next ensuing sinking fund payment for that series pursuant to the terms of the series, the portion thereof, if any, that
is to be satisfied by delivering and crediting Securities of that series pursuant to Section 3.05 and the basis for such credit and will, together with such Officers’ Certificate, deliver to the Trustee any Securities to be so delivered.
Not less than 30 days before each such sinking fund payment date the Trustee shall select the Securities to be redeemed upon such sinking fund payment date in the manner specified in Section 3.02 and cause notice of the redemption
thereof to be given in the name of and at the expense of the Company in the manner provided in Section 3.02. Such notice having been duly given, the redemption of such Securities shall be made upon the terms and in the manner stated in
Section 3.03. 
 ARTICLE 4 
 COVENANTS 
 Section 4.01 Payment of Principal, Premium and
Interest. 
 The Company will duly and punctually pay or cause to be paid the principal of (and premium, if any) and
interest on the Securities of that series at the time and place and in the manner provided herein and established with respect to such Securities. Payments of principal on the Securities may be made at the time provided herein and established with
respect to such Securities by U.S. dollar check drawn on and mailed to the address of the 

  
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Securityholder entitled thereto as such address shall appear in the Security Register, or U.S. dollar wire transfer to, a U.S. dollar account (such wire transfer to be made only to a
Securityholder of an aggregate principal amount of Securities of the applicable series in excess of U.S. $2,000,000 and only if such Securityholder shall have furnished wire instructions to the Trustee no later than 15 days prior to
the relevant payment date). Payments of interest on the Securities may be made at the time provided herein and established with respect to such Securities by U.S. dollar check mailed to the address of the Securityholder entitled thereto as such
address shall appear in the Security Register, or U.S. dollar wire transfer to, a U.S. dollar account (such a wire transfer to be made only to a Securityholder of an aggregate principal amount of Securities of the applicable series in
excess of U.S. $2,000,000 and only if such Securityholder shall have furnished wire instructions in writing to the Security Registrar and the Trustee no later than 15 days prior to the relevant payment date. 

Section 4.02 Maintenance of Office or Agency. 

So long as any series of the Securities remain Outstanding, the Company agrees to maintain an office or agency in Minneapolis, MN, with
respect to each such series and at such other location or locations as may be as herein above authorized for registration of transfer and exchange, and (iii) notices and demands to or upon the Company in respect of the Securities of that series
and this Indenture may be given or served, such designation to continue with respect to such office or agency until the Company shall, by written notice signed by any officer authorized to sign an Officers’ Certificate and delivered to the
Trustee, designate some other office or agency for such purposes or any of them. 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,
notices and demands may be made or served at the Corporate Trust Office of the Trustee, and the Company hereby appoints the Trustee as its agent to receive all such presentations, notices and demands. The Company initially appoints the Corporate
Trust Office of the Trustee located in the Borough of Manhattan, the City of New York as its paying agent with respect to the Securities. 
 Section 4.03 Paying Agents. 
 (a) If the Company shall
appoint one or more paying agents for all or any series of the Securities, other than the Trustee, the Company will cause each 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: 
 (1) that it will hold all sums held by it as such agent for the payment of
the principal of (and premium, if any) or interest on the Securities of that series (whether such sums have been paid to it by the Company or by any other obligor of such Securities) in trust for the benefit of the Persons entitled thereto;

 (2) that it will give the Trustee notice of any failure by the Company (or by any other obligor of such Securities) to
make any payment of the principal of (and premium, if any) or interest on the Securities of that series when the same shall be due and payable; 
 (3) that it will, at any time during the continuance of any failure referred to in the preceding paragraph (a)(2) above, upon the written request of the Trustee, forthwith pay to the
Trustee all sums so held in trust by such paying agent; and 
 (4) that it will perform all other duties of paying agent
as set forth in this Indenture. 
 (b) If the Company shall act as its own paying agent with respect to any series of the
Securities, it will on or before each due date of the principal of (and premium, if any) or interest on Securities of that series, set aside, segregate and hold in trust for the benefit of the Persons entitled thereto a sum sufficient to pay such
principal (and premium, if any) or interest so becoming due on Securities of that series until such sums shall be paid to such Persons or otherwise disposed of as herein provided and will promptly notify the Trustee of such action, or any failure
(by it or any other obligor on such Securities) to take such action. Whenever the Company shall have one or more paying agents for any series of Securities, it will, prior to each due date of the principal of (and premium, if any) or interest on any
Securities of that series, deposit with the paying agent a sum sufficient to pay the principal (and premium, if any) or interest so becoming due, such sum to be held in trust for the benefit of the Persons entitled to such principal, premium or
interest, and (unless such paying agent is the Trustee) the Company will promptly notify the Trustee of this action or failure so to act. 

  
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 (c) Notwithstanding anything in this Section to the contrary, (i) the agreement
to hold sums in trust as provided in this Section is subject to the provisions of Section 11.05, and (ii) the Company may at any time, for the purpose of obtaining the satisfaction and discharge of this Indenture or for any other purpose,
pay, or direct any paying agent to pay, to the Trustee all sums held in trust by the Company or such paying agent, such sums to be held by the Trustee upon the same terms and conditions as those upon which such sums were held by the Company or such
paying agent; and, upon such payment by the Company or any paying agent to the Trustee, the Company or such paying agent shall be released from all further liability with respect to such money. 

Section 4.04 Appointment to Fill Vacancy in Office of Trustee. 

The Company, whenever necessary to avoid or fill a vacancy in the office of Trustee, will appoint, in the manner provided in
Section 7.10, a Trustee, so that there shall at all times be a Trustee hereunder. 
 Section 4.05 Compliance with
Consolidation Provisions. 
 The Company will not, while any of the Securities remain Outstanding, consolidate with
or merge into any other Person, in either case where the Company is not the survivor of such transaction, or sell or convey all or substantially all of its property to any other Person unless the provisions of Article Ten hereof are complied with.

 ARTICLE 5 
 SECURITYHOLDERS’ LISTS AND REPORTS BY 
 THE COMPANY AND THE TRUSTEE

 Section 5.01 Company to Furnish Trustee Names and Addresses of Securityholders. 

The Company will furnish or cause to be furnished to the Trustee (a) within 15 days after each regular record date (as
defined in Section 2.03) a list, in such form as the Trustee may reasonably require, of the names and addresses of the holders of each series of Securities as of such regular record date, provided that the Company shall not be obligated to
furnish or cause to furnish such list at any time that the list shall not differ in any respect from the most recent list furnished to the Trustee by the Company and (b) at such other times as the Trustee may request in writing
within 30 days after the receipt by the Company of any such request, a list of similar form and content as of a date not more than 15 days prior to the time such list is furnished; provided, however, that, in either case, no such
list need be furnished for any series for which the Trustee shall be the Security Registrar. 
 Section 5.02
Preservation Of Information; Communications With Securityholders. 
 (a) The Trustee shall preserve, in as
current a form as is reasonably practicable, all information as to the names and addresses of the holders of Securities contained in the most recent list furnished to it as provided in Section 5.01 and as to the names and addresses of holders
of Securities received by the Trustee in its capacity as Security Registrar (if acting in such capacity). 
 (b) The
Trustee may destroy any list furnished to it as provided in Section 5.01 upon receipt of a new list so furnished. 
 (c)
Securityholders may communicate as provided in Section 312(b) of the Trust Indenture Act with other Securityholders with respect to their rights under this Indenture or under the Securities, and, in connection with any such
communications, the Trustee shall satisfy its obligations under Section 312(b) of the Trust Indenture Act in accordance with the provisions of Section 312(b) of the Trust Indenture Act. 

  
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 Section 5.03 Reports by the Company. 

(a) The Company covenants and agrees to provide to the Trustee (which delivery may be via electronic mail), after the Company
files the same with the Securities and Exchange Commission, copies of the annual reports and of the information, documents and other reports (or copies of such portions of any of the foregoing as the Securities and Exchange Commission may from time
to time by rules and regulations prescribe) that the Company files with the Securities and Exchange Commission pursuant to Section 13 or Section 15(d) of the Exchange Act; or, if the Company is not required to file information,
documents or reports pursuant to either of such sections, then to file with the Trustee, in accordance with the rules and regulations prescribed from time to time by the Securities and Exchange Commission, such of the supplementary and periodic
information, documents and reports that may be required pursuant to Section 13 of the Exchange Act, in respect of a security listed and registered on a national securities exchange as may be prescribed from time to time in such rules and
regulations; provided, however, the Company shall not be required to deliver to the Trustee any materials for which the Company has sought and received confidential treatment by the Securities and Exchange Commission; and provided further, so long
as such filings are available on the Securities and Exchange Commission’s Electronic Data Gathering, Analysis and Retrieval System (EDGAR) or any successor system thereto, such filings shall be deemed to have been filed with the Trustee
for purposes of this Section 5.03 without any further action required by the Company; provided, however, that the Trustee shall have no responsibility whatsoever to determine whether such filings or postings have been made. 

(b) The Company covenants and agrees to file with the Trustee and the Securities and Exchange Commission, in accordance with the
rules and regulations prescribed from to time by the Securities and Exchange Commission, such additional information, documents and reports with respect to compliance by the Company with the conditions and covenants provided for in this Indenture as
may be required from time to time by such rules and regulations. 
 (c) The Company covenants and agrees to transmit by
mail, first class postage prepaid, or reputable over-night delivery service that provides for evidence of receipt, to the Securityholders, as their names and addresses appear upon the Security Register, within 30 days after the filing
thereof with the Trustee, such summaries of any information, documents and reports required to be filed by the Company pursuant to subsections (a) and (b) of this Section as may be required by rules and regulations prescribed from
time to time by the Securities and Exchange Commission. 
 Section 5.04 Reports by the Trustee. 

(a) If required by Section 313(a) of the Trust Indenture Act, the Trustee, within sixty (60) days after each
May 1, shall transmit by mail, first class postage prepaid, to the Securityholders, as their names and addresses appear upon the Security Register, a brief report dated as of such May 1, which complies with Section 313(a) of the
Trust Indenture Act. 
 (b) The Trustee shall comply with Section 313(b) and 313(c) of the Trust
Indenture Act. 
 (c) A copy of each such report shall, at the time of such transmission to Securityholders, be filed by
the Trustee with the Company, with each securities exchange upon which any Securities are listed (if so listed) and also with the Securities and Exchange Commission. The Company agrees to notify the Trustee when any Securities become listed on any
securities exchange. 
 ARTICLE 6 
 REMEDIES OF THE TRUSTEE AND 
 SECURITYHOLDERS ON EVENT OF DEFAULT

 Section 6.01 Events of Default. 

(a) Whenever used herein with respect to Securities of a particular series, “Event of Default” means any one or more of
the following events that has occurred and is continuing: 
 (1) the Company defaults in the payment of any installment
of interest upon any of the Securities of that series, as and when the same shall become due and payable, and such default continues for a period of 90 days; provided, however, that a valid extension of an interest payment period by the
Company in accordance with the terms of any indenture supplemental hereto shall not constitute a default in the payment of interest for this purpose; 

  
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 (2) the Company defaults in the payment of the principal of (or premium, if any, on)
any of the Securities of that series as and when the same shall become due and payable whether at maturity, upon redemption, by declaration or otherwise, or in any payment required by any sinking or analogous fund established with respect to that
series; provided, however, that a valid extension of the maturity of such Securities in accordance with the terms of any indenture supplemental hereto shall not constitute a default in the payment of principal or premium, if any; 

(3) the Company fails to observe or perform any other of its covenants or agreements with respect to that series contained in this
Indenture or otherwise established with respect to that series of Securities pursuant to Section 2.01 hereof (other than a covenant or agreement that has been expressly included in this Indenture solely for the benefit of one or more series of
Securities other than such series) for a period of 90 days after the date on which written notice of such failure, requiring the same to be remedied and stating that such notice is a “Notice of Default” hereunder, shall have been
given to the Company by the Trustee, by registered or certified mail, or to the Company and the Trustee by the holders of at least 25% in principal amount of the Securities of that series at the time Outstanding; 

(4) the Company pursuant to or within the meaning of any Bankruptcy Law (i) commences a voluntary case, (ii) consents to
the entry of an order for relief against it in an involuntary case, (iii) consents to the appointment of a Custodian of it or for all or substantially all of its property or (iv) makes a general assignment for the benefit of its creditors;
or 
 (5) a court of competent jurisdiction enters an order under any Bankruptcy Law that (i) is for relief against
the Company in an involuntary case, (ii) appoints a Custodian of the Company for all or substantially all of its property or (iii) orders the liquidation of the Company, and the order or decree remains unstayed and in effect
for 90 days. 
 (b) In each and every such case (other than an Event of Default specified in
clause (4) or clause (5) above), unless the principal of all the Securities of that series shall have already become due and payable, either the Trustee or the holders of not less than 25% in aggregate principal amount of
the Securities of that series then Outstanding hereunder, by notice in writing to the Company (and to the Trustee if given by such Securityholders), may declare the principal of (and premium, if any, on) and accrued and unpaid interest on all the
Securities of that series to be due and payable immediately, and upon any such declaration the same shall become and shall be immediately due and payable. If an Event of Default specified in clause (4) or clause (5) above occurs,
the principal of and accrued and unpaid interest on all the Securities of that series shall automatically be immediately due and payable without any declaration or other act on the part of the Trustee or the holders of the Securities. 

(c) At any time after the principal of (and premium, if any, on) and accrued and unpaid interest on the Securities of that series
shall have been so declared due and payable, and before any judgment or decree for the payment of the moneys due shall have been obtained or entered as hereinafter provided, the holders of a majority in aggregate principal amount of the Securities
of that series then Outstanding hereunder, by written notice to the Company and the Trustee, may rescind and annul such declaration and its consequences if: (i) the Company has paid or deposited with the Trustee a sum sufficient to pay all
matured installments of interest upon all the Securities of that series and the principal of (and premium, if any, on) any and all Securities of that series that shall have become due otherwise than by acceleration (with interest upon such principal
and premium, if any, and, to the extent that such payment is enforceable under applicable law, upon overdue installments of interest, at the rate per annum expressed in the Securities of that series to the date of such payment or deposit) and the
amount payable to the Trustee under Section 7.06, and (ii) any and all Events of Default under the Indenture with respect to such series, other than the nonpayment of principal on (and premium, if any, on) and accrued and unpaid interest
on Securities of that series that shall not have become due by their terms, shall have been remedied or waived as provided in Section 6.06. 

  
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 No such rescission and annulment shall extend to or shall affect any subsequent default or
impair any right consequent thereon. 
 (d) In case the Trustee shall have proceeded to enforce any right with respect to
Securities of that series under this Indenture and such proceedings shall have been discontinued or abandoned because of such rescission or annulment or for any other reason or shall have been determined adversely to the Trustee, then and in every
such case, subject to any determination in such proceedings, the Company and the Trustee shall be restored respectively to their former positions and rights hereunder, and all rights, remedies and powers of the Company and the Trustee shall continue
as though no such proceedings had been taken. 
 Section 6.02 Collection of Indebtedness and Suits for Enforcement by
Trustee. 
 (a) The Company covenants that (i) in case it shall default in the payment of any installment
of interest on any of the Securities of a series, or in any payment required by any sinking or analogous fund established with respect to that series as and when the same shall have become due and payable, and such default shall have continued for a
period of 90 days, or (ii) in case it shall default in the payment of the principal of (or premium, if any, on) any of the Securities of a series when the same shall have become due and payable, whether upon maturity of the Securities
of a series or upon redemption or upon declaration or otherwise then, upon demand of the Trustee, the Company will pay to the Trustee, for the benefit of the holders of the Securities of that series, the whole amount that then shall have been become
due and payable on all such Securities for principal (and premium, if any) or interest, or both, as the case may be, with interest upon the overdue principal (and premium, if any) and (to the extent that payment of such interest is enforceable under
applicable law) upon overdue installments of interest at the rate per annum expressed in the Securities of that series; and, in addition thereto, such further amount as shall be sufficient to cover the costs and expenses of collection, and the
amount payable to the Trustee under Section 7.06. 
 (b) 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, shall be entitled and empowered to institute any action or proceedings at law or in equity for the collection of the sums so due and unpaid, and may prosecute any
such action or proceeding to judgment or final decree, and may enforce any such judgment or final decree against the Company or other obligor upon the Securities of that series and collect the moneys adjudged or decreed to be payable in the manner
provided by law or equity out of the property of the Company or other obligor upon the Securities of that series, wherever situated. 
 (c) In case of any receivership, insolvency, liquidation, bankruptcy, reorganization, readjustment, arrangement, composition or judicial proceedings affecting the Company, or its creditors or
property, the Trustee shall have power to intervene in such proceedings and take any action therein that may be permitted by the court and shall (except as may be otherwise provided by law) be entitled to file such proofs of claim and other papers
and documents as may be necessary or advisable in order to have the claims of the Trustee and of the holders of Securities of such series allowed for the entire amount due and payable by the Company under the Indenture at the date of institution of
such proceedings and for any additional amount that may become due and payable by the Company after such date, and to collect and receive any moneys or other property payable or deliverable on any such claim, and to distribute the same after the
deduction of the amount payable to the Trustee under Section 7.06; and any receiver, assignee or trustee in bankruptcy or reorganization is hereby authorized by each of the holders of Securities of such series to make such payments to the
Trustee, and, in the event that the Trustee shall consent to the making of such payments directly to such Securityholders, to pay to the Trustee any amount due it under Section 7.06. 

(d) All rights of action and of asserting claims under this Indenture, or under any of the terms established with respect to
Securities of that series, may be enforced by the Trustee without the possession of any of such Securities, 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 payment to the Trustee of any amounts due under Section 7.06, be for the ratable benefit of the holders of the Securities of such
series. 
 In case of an Event of Default hereunder, 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 the Trustee shall deem most 

  
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effectual to protect and enforce any of such rights, either at law or in equity or in bankruptcy or otherwise, whether for the specific enforcement of any covenant or agreement contained in the
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. 
 Nothing contained herein shall be deemed to authorize the Trustee to authorize or consent to or accept or adopt on behalf of any Securityholder any plan of reorganization, arrangement, adjustment or
composition affecting the Securities of that series or the rights of any holder thereof or to authorize the Trustee to vote in respect of the claim of any Securityholder in any such proceeding. 

Section 6.03 Application of Moneys Collected. 

Any moneys collected by the Trustee pursuant to this Article with respect to a particular series of Securities shall be applied in the
following order, at the date or dates fixed by the Trustee and, in case of the distribution of such moneys on account of principal (or premium, if any) or interest, upon presentation of the Securities of that series, and notation thereon of the
payment, if only partially paid, and upon surrender thereof if fully paid: 
 FIRST: To the payment of reasonable costs and
expenses of collection and of all amounts payable to the Trustee under Section 7.06; 
 SECOND: To the payment of the
amounts then due and unpaid upon Securities of such series for principal (and premium, if any) and interest, in respect of which or for the benefit of which such money has been collected, ratably, without preference or priority of any kind,
according to the amounts due and payable on such Securities for principal (and premium, if any) and interest, respectively; and 

THIRD: To the payment of the remainder, if any, to the Company or any other Person lawfully entitled thereto. 

Section 6.04 Limitation on Suits. 
 No holder of any Security of any series shall have any right by virtue 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 or trustee, or for any other remedy hereunder, unless (i) such holder previously shall have given to the Trustee written notice of an Event of Default and of the continuance
thereof with respect to the Securities of such series specifying such Event of Default, as hereinbefore provided; (ii) the holders of not less than 25% in aggregate principal amount of the Securities of such series then Outstanding shall
have made written request upon the Trustee to institute such action, suit or proceeding in its own name as Trustee hereunder; (iii) such holder or holders shall have offered to the Trustee such reasonable indemnity as it may require against the
costs, expenses and liabilities to be incurred therein or thereby; (iv) the Trustee for 60 days after its receipt of such notice, request and offer of indemnity, shall have failed to institute any such action, suit or proceeding and
(v) during such 60 day period, the holders of a majority in principal amount of the Securities of that series do not give the Trustee a direction inconsistent with the request. 

Notwithstanding anything contained herein to the contrary or any other provisions of this Indenture, the right of any holder of any
Security to receive payment of the principal of (and premium, if any) and interest on such Security, as therein provided, on or after the respective due dates expressed in such Security (or in the case of redemption, on the redemption date), or to
institute suit for the enforcement of any such payment on or after such respective dates or redemption date, shall not be impaired or affected without the consent of such holder and by accepting a Security hereunder it is expressly understood,
intended and covenanted by the taker and holder of every Security of such series with every other such taker and holder and the Trustee, that no one or more holders of Securities of such series shall have any right in any manner whatsoever by virtue
or by availing of any provision of this Indenture to affect, disturb or prejudice the rights of the holders of any other of such Securities, 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 of Securities of such series. For the protection and enforcement of the provisions of this Section, each and every Securityholder
and the Trustee shall be entitled to such relief as can be given either at law or in equity. 

  
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 Section 6.05 Rights and Remedies Cumulative; Delay or Omission Not Waiver.

 (a) Except as otherwise provided in Section 2.07, all powers and remedies given by this Article to the
Trustee or to the Securityholders shall, to the extent permitted by law, be deemed cumulative and not exclusive of any other powers and remedies available to the Trustee or the holders of the Securities, by judicial proceedings or otherwise, to
enforce the performance or observance of the covenants and agreements contained in this Indenture or otherwise established with respect to such Securities. 
 (b) No delay or omission of the Trustee or of any holder of any of the Securities to exercise any right or power accruing upon any Event of Default occurring and continuing as aforesaid shall
impair any such right or power, or shall be construed to be a waiver of any such default or an acquiescence therein; and, subject to the provisions of Section 6.04, every power and remedy given by this Article or by law to the Trustee or the
Securityholders may be exercised from time to time, and as often as shall be deemed expedient, by the Trustee or by the Securityholders. 
 Section 6.06 Control by Securityholders. 
 The holders of a
majority in aggregate principal amount of the Securities of any series 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 such series; provided, however, that such direction shall not be in conflict with any rule of law or with this Indenture. Subject to the provisions
of Section 7.01, the Trustee shall have the right to decline to follow any such direction if the Trustee in good faith shall, by a Responsible Officer or officers of the Trustee, determine that the proceeding so directed, subject to the
Trustee’s duties under the Trust Indenture Act, would involve the Trustee in personal liability or might be unduly prejudicial to the Securityholders not involved in the proceeding. The holders of a majority in aggregate principal amount of the
Securities of any series at the time Outstanding affected thereby, determined in accordance with Section 8.04, may on behalf of the holders of all of the Securities of such series waive any past default in the performance of any of the
covenants contained herein or established pursuant to Section 2.01 with respect to such series and its consequences, except a default in the payment of the principal of, or premium, if any, or interest on, any of the Securities of that series
as and when the same shall become due by the terms of such Securities otherwise than by acceleration (unless such default has been cured and a sum sufficient to pay all matured installments of interest and principal and any premium has been
deposited with the Trustee (in accordance with Section 6.01(c)). Upon any such waiver, the default covered thereby shall be deemed to be cured for all purposes of this Indenture and the Company, the Trustee and the holders of the Securities of
such series shall be restored to their former positions and rights hereunder, respectively; but no such waiver shall extend to any subsequent or other default or impair any right consequent thereon. 

Section 6.07 Undertaking to Pay Costs. 
 All parties to this Indenture agree, and each holder of any Securities by such holder’s 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, 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;
but the provisions of this Section shall not apply to any suit instituted by the Trustee, to any suit instituted by any Securityholder, or group of Securityholders, holding more than 10% in aggregate principal amount of the Outstanding
Securities of any series, or to any suit instituted by any Securityholder for the enforcement of the payment of the principal of (or premium, if any) or interest on any Security of such series, on or after the respective due dates expressed in such
Security or established pursuant to this Indenture. 

  
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 ARTICLE 7 
 CONCERNING THE TRUSTEE 
 Section 7.01 Certain Duties and
Responsibilities of Trustee. 
 (a) The Trustee, prior to the occurrence of an Event of Default with respect
to the Securities of a series and after the curing of all Events of Default with respect to the Securities of that series that may have occurred, shall undertake to perform with respect to the Securities of such series such duties and only such
duties as are specifically set forth in this Indenture, and no implied covenants shall be read into this Indenture against the Trustee. In case an Event of Default with respect to the Securities of a series has occurred (that has not been cured or
waived), the Trustee shall exercise with respect to Securities of that series such of the rights and powers vested in it by this Indenture, and use the same degree of care and skill in their exercise, as a prudent man would exercise or use under the
circumstances in the conduct of his own affairs. 
 (b) No provision of this Indenture shall be construed to relieve the
Trustee from liability for its own negligent action, its own negligent failure to act, or its own willful misconduct, except that: 
 (i) prior to the occurrence of an Event of Default with respect to the Securities of a series and after the curing or waiving of all such Events of Default with respect to that series that may have
occurred: 
 (A) the duties and obligations of the Trustee shall with respect to the Securities of such series be determined
solely by the express provisions of this Indenture, and the Trustee shall not be liable with respect to the Securities of such series 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 
 (B) in the absence of bad faith
on the part of the Trustee, the Trustee may with respect to the Securities of such series 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 provision 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; 
 (ii) the Trustee shall not be liable
for any error of judgment made in good faith by a Responsible Officer or Responsible Officers of the Trustee, unless it shall be proved that the Trustee was negligent in ascertaining the pertinent facts; 

(iii) 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 in principal amount of the Securities of any series at the time Outstanding 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 with respect to the Securities of that series; and 
 (iv) No provision of this Indenture shall require the Trustee to risk its own funds or otherwise incur any financial liability in the performance of any of its duties, or in the exercise of any of its
rights or powers, if it shall have reasonable grounds for believing that repayment of such funds or adequate indemnity against such risk is not reasonably assured to it. 
 (c) The Trustee will not be liable for interest on any money received by it except as the Trustee may agree in writing with the Company. Money held in trust by the Trustee need not be segregated
from other funds except to the extent required by law. 
 Section 7.02 Certain Rights of Trustee. 

Except as otherwise provided in Section 7.01: 
 (a) The Trustee may rely and shall be protected in acting or refraining from acting upon any resolution, certificate, statement, instrument, opinion, report, notice, request, consent, order,
approval, bond, security or other paper or document believed by it to be genuine and to have been signed or presented by the proper party or parties and the Trustee need not investigate any fact or matter stated; 

  
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 (b) Any request, direction, order or demand of the Company mentioned herein shall be
sufficiently evidenced by a Board Resolution or an instrument signed in the name of the Company by any authorized officer of the Company (unless other evidence in respect thereof is specifically prescribed herein); 

(c) The Trustee may consult with counsel and the written advice of such counsel or any Opinion of Counsel shall be full and
complete authorization and protection in respect of any action taken or suffered or omitted hereunder in good faith and in reliance thereon; 
 (d) The Trustee shall be under no obligation to exercise any of the rights or powers vested in it by this Indenture at the request, order or direction of any of the Securityholders pursuant to the
provisions of this Indenture, unless such Securityholders shall have offered to the Trustee reasonable security or indemnity against the costs, expenses and liabilities that may be incurred therein or thereby; nothing contained herein shall,
however, relieve the Trustee of the obligation, upon the occurrence of an Event of Default with respect to a series of the Securities (that has not been cured or waived), to exercise with respect to Securities of that series such of the rights and
powers vested in it by this Indenture, and to use the same degree of care and skill in their exercise, as a prudent man would exercise or use under the circumstances in the conduct of his own affairs; 

(e) Any permissive right or authority granted to the Trustee shall not be construed as a mandatory duty; 

(f) The Trustee shall not be liable for any action taken or omitted to be taken by it in good faith and believed by it to be
authorized or within the discretion or rights or powers conferred upon it by this Indenture; 
 (g) 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, consent, order, approval, bond, security, or other papers or documents, unless requested in
writing so to do by the holders of not less than a majority in principal amount of the Outstanding Securities of the particular series affected thereby (determined as provided in Section 8.04); provided, however, that if the payment within a
reasonable time to the Trustee of the costs, expenses or liabilities likely to be incurred by it in the making of such investigation is, in the opinion of the Trustee, not reasonably assured to the Trustee by the security afforded to it by the terms
of this Indenture, the Trustee may require reasonable indemnity against such costs, expenses or liabilities as a condition to so proceeding. The reasonable expense of every such examination shall be paid by the Company or, if paid by the Trustee,
shall be repaid by the Company upon demand; 
 (h) The Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or attorneys and the Trustee shall not be responsible for any misconduct or negligence on the part of any agent or attorney appointed with due care by it hereunder; 

(i) The rights, privileges, protections, immunities and benefits given to the Trustee, including, its right to be compensated,
reimbursed, and indemnified, and its right to resign, are extended to, and shall be enforceable by the Trustee, including but not limited to its capacities as Paying Agent and Security Registrar and to each agent, custodian and other Person employed
to act hereunder; 
 (j) The Trustee may request that the Company deliver an Officers’ Certificate setting forth the
names of individuals and/or titles of officers authorized at such time to take specified actions pursuant to this Indenture, which Officers’ Certificate may be signed by any person authorized to sign an Officer’s Certificate, including any
person specified as so authorized in any such certificate previously delivered and not superseded; and 
 (k) In no event
shall the Trustee be responsible or liable for special, indirect, punitive or consequential loss or damage of any kind whatsoever (including, but not limited to, loss or profit) irrespective of whether the Trustee has been advised of the likelihood
of such loss or damage and regardless of the form of action. 

  
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 In addition, the Trustee shall not be deemed to have knowledge of any Default or Event of
Default except (1) any Event of Default occurring pursuant to Sections 6.01(a)(1) and 6.01(a)(2) or (2) any Default or Event of Default of which the Trustee shall have received written notification in the manner set
forth in this Indenture or a Responsible Officer of the Trustee shall have obtained actual knowledge. Delivery of reports, information and documents to the Trustee under Section 5.03 is for informational purposes only and the information and
the Trustee’s receipt of the foregoing shall not constitute constructive notice of any information contained therein, or determinable from information contained therein including the Company’s compliance with any of their covenants
thereunder (as to which the Trustee is entitled to rely exclusively on an Officers’ Certificate). 
 Section 7.03
Trustee Not Responsible for Recitals or Issuance or Securities. 
 (a) The recitals contained herein and in
the Securities shall be taken as the statements of the Company, and the Trustee assumes no responsibility for the correctness of the same. 
 (b) The Trustee makes no representations as to the validity or sufficiency of this Indenture or of the Securities. 
 (c) The Trustee shall not be accountable for the use or application by the Company of any of the Securities or of the proceeds of such Securities, or for the use or application of any moneys paid
over by the Trustee in accordance with any provision of this Indenture or established pursuant to Section 2.01, or for the use or application of any moneys received by any paying agent other than the Trustee. 

Section 7.04 May Hold Securities. 
 The Trustee or any paying agent or Security Registrar, in its individual or any other capacity, may become the owner or pledgee of Securities with the same rights it would have if it were not Trustee,
paying agent or Security Registrar. 
 Section 7.05 Moneys Held in Trust. 

Subject to the provisions of Section 11.05, all moneys received by the Trustee shall, until used or applied as herein provided, be
held in trust for the purposes for which they were received, but 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 moneys received by it hereunder except such as
it may agree with the Company to pay thereon. 
 Section 7.06 Compensation and Reimbursement. 

(a) The Company covenants and agrees to pay to the Trustee, and the Trustee shall be entitled to, such reasonable compensation
(which shall not be limited by any provision of law in regard to the compensation of a trustee of an express trust) as the Company and the Trustee may from time to time agree in writing, for all services rendered by it in the execution of the trusts
hereby created and in the exercise and performance of any of the powers and duties hereunder of the Trustee, and, except as otherwise expressly provided herein, the Company will pay or reimburse the Trustee upon its request for all reasonable
expenses, disbursements and advances incurred or made by the Trustee in accordance with any of the provisions of this Indenture (including the reasonable compensation and the expenses and disbursements of its counsel and of all Persons not regularly
in its employ), except any such expense, disbursement or advance as may arise from its negligence or bad faith and except as the Company and Trustee may from time to time agree in writing. The Company also covenants to indemnify the Trustee (and its
officers, agents, directors and employees) for, and to hold it harmless against, any loss, liability or expense incurred without negligence or bad faith on the part of the Trustee and arising out of or in connection with the acceptance or
administration of this trust, including the reasonable costs and expenses of defending itself against any claim of liability in the premises. 
 (b) The obligations of the Company under this Section to compensate and indemnify the Trustee and to pay or reimburse the Trustee for reasonable expenses, disbursements and advances shall
constitute additional indebtedness hereunder. Such additional indebtedness shall be secured by a lien prior to that of the Securities upon 

  
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all property and funds held or collected by the Trustee as such, except funds held in trust for the benefit of the holders of particular Securities. The obligations of the Company will survive
the satisfaction and discharge of this Indenture or earlier resignation or removal of the Trustee. 
 Section 7.07
Reliance on Officers’ Certificate. 
 Except as otherwise provided in Section 7.01, whenever in the
administration of the provisions of this Indenture the Trustee shall deem it reasonably necessary or desirable that a matter be proved or established prior to taking or suffering or omitting to take any action hereunder, such matter (unless other
evidence in respect thereof be herein specifically prescribed) may, in the absence of negligence or bad faith on the part of the Trustee, be deemed to be conclusively proved and established by an Officers’ Certificate delivered to the Trustee
and such certificate, in the absence of negligence or bad faith on the part of the Trustee, shall be full warrant to the Trustee for any action taken, suffered or omitted to be taken by it under the provisions of this Indenture upon the faith
thereof. 
 Section 7.08 Disqualification; Conflicting Interests. 

If the Trustee has or shall acquire any “conflicting interest” within the meaning of Section 310(b) of the Trust
Indenture Act, the Trustee and the Company shall in all respects comply with the provisions of Section 310(b) of the Trust Indenture Act. 
 Section 7.09 Corporate Trustee Required; Eligibility. 
 There
shall at all times be a Trustee with respect to the Securities issued hereunder which shall at all times be a corporation organized and doing business under the laws of the United States of America or any state or territory thereof or of the
District of Columbia, or a corporation or other Person permitted to act as trustee by the Securities and Exchange Commission, authorized under such laws to exercise corporate trust powers, having a combined capital and surplus of at least fifty
million U.S. dollars ($50,000,000), and subject to supervision or examination by federal, state, territorial, or District of Columbia authority. 
 If such corporation or other Person publishes reports of condition at least annually, pursuant to law or to the requirements of the aforesaid supervising or examining authority, then for the purposes of
this Section, the combined capital and surplus of such corporation or other Person shall be deemed to be its combined capital and surplus as set forth in its most recent report of condition so published. The Company may not, nor may any Person
directly or indirectly controlling, controlled by, or under common control with the Company, serve as Trustee. In case at any time the Trustee shall cease to be eligible in accordance with the provisions of this Section, the Trustee shall resign
immediately in the manner and with the effect specified in Section 7.10. 
 Section 7.10 Resignation and Removal;
Appointment of Successor. 
 (a) The Trustee or any successor hereafter appointed may at any time resign with
respect to the Securities of one or more series by giving written notice thereof to the Company and by transmitting notice of resignation by mail, first class postage prepaid, to the Securityholders of such series, as their names and addresses
appear upon the Security Register. Upon receiving such notice of resignation, the Company shall promptly appoint a successor trustee with respect to Securities of such series by written instrument, in duplicate, executed by order of the Board of
Directors, one copy of which instrument shall be delivered to the resigning Trustee and one copy to the successor trustee. If no successor trustee shall have been so appointed and have accepted appointment within 30 days after the mailing
of such notice of resignation, the resigning Trustee may petition any court of competent jurisdiction for the appointment of a successor trustee with respect to Securities of such series, or any Securityholder of that series who has been a bona fide
holder of a Security or Securities for at least six months may on behalf of himself 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 one of the following shall occur:

 (i) the Trustee shall fail to comply with the provisions of Section 7.08 after written request therefor by the Company
or by any Securityholder who has been a bona fide holder of a Security or Securities for at least six months; or 

  
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 (ii) the Trustee shall cease to be eligible in accordance with the provisions of
Section 7.09 and shall fail to resign after written request therefor by the Company or by any such Securityholder; or 

(iii) the Trustee shall become incapable of acting, or shall be adjudged a bankrupt or insolvent, or commence a voluntary bankruptcy
proceeding, or a receiver of the Trustee or of its property shall be appointed or consented to, or any public officer shall take charge or control of the Trustee or of its property or affairs for the purpose of rehabilitation, conservation or
liquidation; then, in any such case, the Company may remove the Trustee with respect to all Securities 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 any Securityholder who has been a bona fide holder of a Security or Securities for at least six months may, on behalf of that holder 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 Securities of any series at
the time Outstanding may at any time remove the Trustee with respect to such series by so notifying the Trustee and the Company and may appoint a successor Trustee for such series with the consent of the Company. 

(d) Any resignation or removal of the Trustee and appointment of a successor trustee with respect to the Securities of a series
pursuant to any of the provisions of this Section shall become effective upon acceptance of appointment by the successor trustee as provided in Section 7.11. 
 (e) Any successor trustee appointed pursuant to this Section may be appointed with respect to the Securities of one or more series or all of such series, and at any time there shall be only one
Trustee with respect to the Securities of any particular series. 
 (f) Appointment of a successor Trustee will become
effective only upon the successor Trustee’s acceptance of appointment as provided in this Section. 
 Section 7.11
Acceptance of Appointment By Successor. 
 (a) In case of the appointment hereunder of a successor trustee
with respect to all Securities, every such successor trustee so appointed shall execute, acknowledge and deliver to the Company and to the retiring Trustee an instrument accepting such appointment, and thereupon the resignation or removal of the
retiring Trustee shall become effective and such successor trustee, without any further act, deed or conveyance, shall become vested with all the rights, powers, trusts and duties of the retiring Trustee; but, on the request of the Company or the
successor trustee, such retiring Trustee shall, upon payment of its charges, execute and deliver an instrument transferring to such successor trustee all the rights, powers, and trusts of the retiring Trustee and shall duly assign, transfer and
deliver to such successor trustee all property and money held by such retiring Trustee hereunder. 
 (b) In case of the
appointment hereunder of a successor trustee with respect to the Securities of one or more (but not all) series, the Company, the retiring Trustee and each successor trustee with respect to the Securities of one or more series shall execute and
deliver an indenture supplemental hereto wherein each successor trustee shall accept such appointment and which (i) shall contain such provisions as shall be necessary or desirable to transfer and confirm to, and to vest in, each successor
trustee all the rights, powers, trusts and duties of the retiring Trustee with respect to the Securities of that or those series to which the appointment of such successor trustee relates, (ii) shall contain such provisions as shall be deemed
necessary or desirable to confirm that all the rights, powers, trusts and duties of the retiring Trustee with respect to the Securities of that or those series as to which the retiring Trustee is not retiring shall continue to be vested in the
retiring Trustee, and (iii) shall add to or change any of the provisions of this Indenture as shall be necessary to provide for or facilitate the administration of the trusts hereunder by more than one Trustee, it being understood that nothing
herein or in such supplemental indenture shall 

  
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constitute such Trustees co-trustees of the same trust, that each such Trustee shall be trustee of a trust or trusts hereunder separate and apart from any trust or trusts hereunder administered
by any other such Trustee and that no Trustee shall be responsible for any act or failure to act on the part of any other Trustee hereunder; and upon the execution and delivery of such supplemental indenture the resignation or removal of the
retiring Trustee shall become effective to the extent provided therein, such retiring Trustee shall with respect to the Securities of that or those series to which the appointment of such successor trustee relates have no further responsibility for
the exercise of rights and powers or for the performance of the duties and obligations vested in the Trustee under this Indenture, and each such successor trustee, without any further act, deed or conveyance, shall become vested with all the rights,
powers, trusts and duties of the retiring Trustee with respect to the Securities of that or those series to which the appointment of such successor trustee relates; but, on request of the Company or any successor trustee, such retiring Trustee shall
duly assign, transfer and deliver to such successor trustee, to the extent contemplated by such supplemental indenture, the property and money held by such retiring Trustee hereunder with respect to the Securities of that or those series to which
the appointment of such successor trustee relates. 
 (c) Upon request of any such successor trustee, the Company shall
execute any and all instruments for more fully and certainly vesting in and confirming to such successor trustee all such rights, powers and trusts referred to in paragraph (a) or (b) of this Section, as the case may be. 

(d) No successor trustee shall accept its appointment unless at the time of such acceptance such successor trustee shall be
qualified and eligible under this Article. 
 (e) Upon acceptance of appointment by a successor trustee as provided in
this Section, the Company shall transmit notice of the succession of such trustee hereunder by mail, first class postage prepaid, to the Securityholders, as their names and addresses appear upon the Security Register. If the Company fails to
transmit such notice within ten days after acceptance of appointment by the successor trustee, the successor trustee shall cause such notice to be transmitted at the expense of the Company. 

Section 7.12 Merger, Conversion, Consolidation or Succession to Business. 

Any corporation into which the Trustee may be merged or converted or with which it may be consolidated, or any corporation resulting from
any merger, conversion or consolidation to which the Trustee shall be a party, or any corporation succeeding to the corporate trust business of the Trustee, including the administration of the trust created by this Indenture, shall be the successor
of the Trustee hereunder, provided that such corporation shall be qualified under the provisions of Section 7.08 and eligible under the provisions of Section 7.09, without the execution or filing of any paper or any further act on the part
of any of the parties hereto, anything herein to the contrary notwithstanding. In case any Securities shall have been authenticated, but not delivered, by the Trustee then in office, any successor by merger, conversion or consolidation to such
authenticating Trustee may adopt such authentication and deliver the Securities so authenticated with the same effect as if such successor Trustee had itself authenticated such Securities. 

Section 7.13 Preferential Collection of Claims Against the Company. 

The Trustee shall comply with Section 311(a) of the Trust Indenture Act, excluding any creditor relationship described in
Section 311(b) of the Trust Indenture Act. A Trustee who has resigned or been removed shall be subject to Section 311(a) of the Trust Indenture Act to the extent included therein. 

Section 7.14 Notice of Default 
 If any Default or any Event of Default occurs and is continuing and if such Default or Event of Default is actually known to a Responsible Officer of the Trustee, the Trustee shall mail to each
Securityholder in the manner and to the extent provided in Section 313(c) of the Trust Indenture Act notice of the Default or Event of Default within 45 days after it occurs, unless such Default or Event of Default has been
cured; provided, however, that, except in the case of a default in the payment of the principal of (or premium, if any) or interest on any Security, the Trustee shall be protected in withholding such notice if and so long as the board of
directors, the executive committee or a trust committee of directors and/or Responsible Officers of the Trustee in good faith determine that the withholding of such notice is in the interest of the Securityholders. 

  
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 ARTICLE 8 
 CONCERNING THE SECURITYHOLDERS 
 Section 8.01 Evidence of Action by
Securityholders. 
 Whenever in this Indenture it is provided that the holders of a majority or specified percentage
in aggregate principal amount of the Securities of a particular series 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 majority or specified percentage of that series have joined therein may be evidenced by any instrument or any number of instruments of similar tenor executed by such holders of Securities of that series in
person or by agent or proxy appointed in writing. 
 If the Company shall solicit from the Securityholders of any series any
request, demand, authorization, direction, notice, consent, waiver or other action, the Company may, at its option, as evidenced by an Officers’ Certificate, fix in advance a record date for such series for the determination of Securityholders
entitled to give such request, demand, authorization, direction, notice, consent, waiver or other action, but the Company shall have no obligation to do so. If such a record date is fixed, such request, demand, authorization, direction, notice,
consent, waiver or other action may be given before or after the record date, but only the Securityholders of record at the close of business on the record date shall be deemed to be Securityholders for the purposes of determining whether
Securityholders of the requisite proportion of Outstanding Securities of that series have authorized or agreed or consented to such request, demand, authorization, direction, notice, consent, waiver or other action, and for that purpose the
Outstanding Securities of that series shall be computed as of the record date; provided, however, that no such authorization, agreement or consent by such Securityholders on the record date shall be deemed effective unless it shall become effective
pursuant to the provisions of this Indenture not later than six months after the record date. 
 Section 8.02 Proof of
Execution by Securityholders. 
 Subject to the provisions of Section 7.01, proof of the execution of any
instrument by a Securityholder (such proof will not require notarization) or his agent or proxy and proof of the holding by any Person of any of the Securities shall be sufficient if made in the following manner: 

(a) The fact and date of the execution by any such Person of any instrument may be proved in any reasonable manner acceptable to
the Trustee. 
 (b) The ownership of Securities shall be proved by the Security Register of such Securities or by a
certificate of the Security Registrar thereof. The Trustee may require such additional proof of any matter referred to in this Section as it shall deem necessary. 
 Section 8.03 Who May be Deemed Owners. 
 Prior to the due
presentment for registration of transfer of any Security, the Company, the Trustee, any paying agent and any Security Registrar may deem and treat the Person in whose name such Security shall be registered upon the books of the Company as the
absolute owner of such Security (whether or not such Security shall be overdue and notwithstanding any notice of ownership or writing thereon made by anyone other than the Security Registrar) for the purpose of receiving payment of or on account of
the principal of, premium, if any, and (subject to Section 2.03) interest on such Security and for all other purposes; and neither the Company nor the Trustee nor any paying agent nor any Security Registrar shall be affected by any notice to
the contrary. 

  
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 Section 8.04 Certain Securities Owned by Company Disregarded. 

In determining whether the holders of the requisite aggregate principal amount of Securities of a particular series have concurred in any
direction, consent or waiver under this Indenture, the Securities of that series that are owned by the Company or any other obligor on the Securities of that series or by any Person directly or indirectly controlling or controlled by or under common
control with the Company or any other obligor on the Securities of that series shall be disregarded and deemed not to be Outstanding for the purpose of any such determination, except that for the purpose of determining whether the Trustee shall be
protected in relying on any such direction, consent or waiver, only Securities of such series that the Trustee actually knows are so owned shall be so disregarded. The Securities so owned that have been pledged in good faith may be regarded as
Outstanding for the purposes of this Section, if the pledgee shall establish to the satisfaction of the Trustee the pledgee’s right so to act with respect to such Securities and that the pledgee is not a Person directly or indirectly
controlling or controlled by or under direct or indirect common control with the Company or any such other obligor. In 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. 
 Section 8.05 Actions Binding on Future Securityholders. 

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 majority or percentage in aggregate principal amount of the Securities of a particular series specified in this Indenture in connection with such action, any holder of a Security of that series that is shown by the evidence to be
included in the Securities the holders of which have consented to such action may, by filing written notice with the Trustee, and upon proof of holding as provided in Section 8.02, revoke such action so far as concerns such Security. Except as
aforesaid any such action taken by the holder of any Security shall be conclusive and binding upon such holder and upon all future holders and owners of such Security, and of any Security issued in exchange therefor, on registration of transfer
thereof or in place thereof, irrespective of whether or not any notation in regard thereto is made upon such Security. Any action taken by the holders of the majority or percentage in aggregate principal amount of the Securities of a particular
series specified in this Indenture in connection with such action shall be conclusively binding upon the Company, the Trustee and the holders of all the Securities of that series. 

ARTICLE 9 

SUPPLEMENTAL INDENTURES 
 Section 9.01 Supplemental Indentures Without the Consent of Securityholders. 
 In addition to any supplemental indenture otherwise authorized by this Indenture, the Company and the Trustee may from time to time and at any time enter into an indenture or indentures supplemental
hereto (which shall conform to the provisions of the Trust Indenture Act as then in effect), without the consent of the Securityholders, for one or more of the following purposes: 

(a) to cure any ambiguity, defect, or inconsistency herein or in the Securities of any series; 

(b) to comply with Article Ten; 
 (c) to provide for uncertificated Securities in addition to or in place of certificated Securities; 
 (d) to add to the covenants, restrictions, conditions or provisions relating to the Company for the benefit of the holders of all or any series of Securities (and if such covenants, restrictions,
conditions or provisions are to be for the benefit of less than all series of Securities, stating that such covenants, restrictions, conditions or provisions are expressly being included solely for the benefit of such series), to make the
occurrence, or the occurrence and the continuance, of a default in any such additional covenants, restrictions, conditions or provisions an Event of Default, or to surrender any right or power herein conferred upon the Company; 

(e) to add to, delete from, or revise the conditions, limitations, and restrictions on the authorized amount, terms, or purposes
of issue, authentication, and delivery of Securities, as herein set forth; 

  
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 (f) to make any change that does not adversely affect the rights of any
Securityholder in any material respect; 
 (g) to provide for the issuance of and establish the form and terms and
conditions of the Securities of any series as provided in Section 2.01, to establish the form of any certifications required to be furnished pursuant to the terms of this Indenture or any series of Securities, or to add to the rights of the
holders of any series of Securities; 
 (h) to evidence and provide for the acceptance of appointment hereunder by a
successor trustee; or 
 (i) to comply with any requirements of the Securities and Exchange Commission or any successor
in connection with the qualification of this Indenture under the Trust Indenture Act. 
 The Trustee is hereby authorized to
join with the Company in the execution of any such supplemental indenture, and to make any further appropriate agreements and stipulations that may be therein contained, but the Trustee shall not be obligated to enter into any such supplemental
indenture that affects the Trustee’s own rights, duties or immunities under this Indenture or otherwise. 
 Any
supplemental indenture authorized by the provisions of this Section may be executed by the Company and the Trustee without the consent of the holders of any of the Securities at the time Outstanding, notwithstanding any of the provisions of
Section 9.02. 
 Section 9.02 Supplemental Indentures With Consent of Securityholders. 

With the consent (evidenced as provided in Section 8.01) of the holders of not less than a majority in aggregate principal amount of
the Securities of each series affected by such supplemental indenture or indentures at the time Outstanding, the Company, when authorized by a Board Resolution, and the Trustee may from time to time and at any time enter into an indenture or
indentures supplemental hereto (which shall conform to the provisions of the Trust Indenture Act as then in effect) for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of this Indenture or of
any supplemental indenture or of modifying in any manner not covered by Section 9.01 the rights of the holders of the Securities of such series under this Indenture; provided, however, that no such supplemental indenture shall, without the
consent of the holders of each Security then Outstanding and affected thereby, 
 (i) extend the fixed maturity of any
Securities of any series, or reduce the principal amount thereof, or reduce the rate or extend the time of payment of interest thereon, 
 (ii) reduce any premium payable upon the redemption thereof or reduce the aforesaid percentage of Securities, the holders of which are required to consent to any such supplemental indenture; 

(iii) change any obligation to pay additional amounts; 
 (iv) reduce the amount of principal of an original issue discount security or any other Security payable upon acceleration of the maturity thereof; 

(v) change currency in which any Security or any premium or interest is payable; 

(vi) impair the right to enforce any payment on or with respect to any Security; 

(vii) adversely change the right to convert or exchange, including decreasing the conversion rate or increasing the conversion price of,
such Security (if applicable); 
 (viii) if the Securities are secured, change the terms and conditions pursuant to which the
Securities are secured in a manner adverse to the holders of the Securities; 

  
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 (ix) reduce the percentage in principal amount of outstanding Securities of any series, the
consent of whose holders is required for modification or amendment of the indenture or for waiver of compliance with certain provisions of the indenture or for waiver of certain defaults; 

(x) reduce the requirements contained in the indenture for quorum or voting; 

(xi) change any obligations of the Company to maintain an office or agency in the places and for the purposes required by the indentures;
or 
 (xii) modify any of the above provisions. 
 It shall not be necessary for the consent of the Securityholders of any series affected thereby under this Section to approve the particular form of any proposed supplemental indenture, but it shall be
sufficient if such consent shall approve the substance thereof. 
 Section 9.03 Effect of Supplemental
Indentures. 
 Upon the execution of any supplemental indenture pursuant to the provisions of this Article or of
Section 10.01, this Indenture shall, with respect to such series, be and be deemed to be modified and amended in accordance therewith and the respective rights, limitations of rights, obligations, duties and immunities under this Indenture of
the Trustee, the Company and the holders of Securities of the series affected thereby shall thereafter be determined, exercised and enforced hereunder subject in all respects to such modifications and amendments, and all the terms and conditions of
any such supplemental indenture shall be and be deemed to be part of the terms and conditions of this Indenture for any and all purposes. 
 Section 9.04 Securities Affected by Supplemental Indentures. 

Securities of any series affected by a supplemental indenture, authenticated and delivered after the execution of such supplemental
indenture pursuant to the provisions of this Article or of Section 10.01, may bear a notation in form approved by the Company, provided such form meets the requirements of any securities exchange upon which such series may be listed, as to any
matter provided for in such supplemental indenture. If the Company shall so determine, new Securities of that series so modified as to conform, in the opinion of the Board of Directors, to any modification of this Indenture contained in any such
supplemental indenture may be prepared by the Company, authenticated by the Trustee and delivered in exchange for the Securities of that series then Outstanding. 
 Section 9.05 Execution of Supplemental Indentures. 
 Upon the
request of the Company, accompanied by its Board Resolutions authorizing the execution of any such supplemental indenture, and upon the filing with the Trustee of evidence of the consent of Securityholders required to consent thereto as aforesaid,
the Trustee shall join with the Company in the execution of such supplemental indenture unless such supplemental indenture affects the Trustee’s own rights, duties or immunities under this Indenture or otherwise, in which case the Trustee may
in its discretion but shall not be obligated to enter into such supplemental indenture. The Trustee, subject to the provisions of Section 7.01, may receive an Officers’ Certificate or an Opinion of Counsel as conclusive evidence that any
supplemental indenture executed pursuant to this Article is authorized or permitted by, and conforms to, the terms of this Article and that it is proper for the Trustee under the provisions of this Article to join in the execution thereof; provided,
however, that such Officers’ Certificate or Opinion of Counsel need not be provided in connection with the execution of a supplemental indenture that establishes the terms of a series of Securities pursuant to Section 2.01 hereof.

 Promptly after the execution by the Company and the Trustee of any supplemental indenture pursuant to the provisions of this
Section, the Trustee shall transmit by mail, first class postage prepaid, a notice, setting forth in general terms the substance of such supplemental indenture, to the Securityholders of all series affected thereby as their names and addresses
appear upon the Security Register. Any failure of the Trustee to mail such notice, or any defect therein, shall not, however, in any way impair or affect the validity of any such supplemental indenture. 

  
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 ARTICLE 10 
 SUCCESSOR ENTITY 
 Section 10.01 Company May Consolidate,
Etc. 
 Except as provided pursuant to Section 2.01 pursuant to a Board Resolution, and set forth in an
Officers’ Certificate, or established in one or more indentures supplemental to this Indenture, nothing contained in this Indenture shall prevent any consolidation or merger of the Company with or into any other Person (whether or not
affiliated with the Company) or successive consolidations or mergers in which the Company or its successor or successors shall be a party or parties, or shall prevent any sale, conveyance, transfer or other disposition of the property of the Company
or its successor or successors as an entirety, or substantially as an entirety, to any other corporation (whether or not affiliated with the Company or its successor or successors) authorized to acquire and operate the same; provided, however,
(a) the Company hereby covenants and agrees that, upon any such consolidation or merger (in each case, if the Company is not the survivor of such transaction), sale, conveyance, transfer or other disposition, the due and punctual payment of the
principal of (premium, if any) and interest on all of the Securities of all series in accordance with the terms of each series, according to their tenor, and the due and punctual performance and observance of all the covenants and conditions of this
Indenture with respect to each series or established with respect to such series pursuant to Section 2.01 to be kept or performed by the Company shall be expressly assumed, by supplemental indenture (which shall conform to the provisions of the
Trust Indenture Act, as then in effect) reasonably satisfactory in form to the Trustee executed and delivered to the Trustee by the entity formed by such consolidation, or into which the Company shall have been merged, or by the entity which shall
have acquired such property and (b) in the event that the Securities of any series then Outstanding are convertible into or exchangeable for shares of common stock or other securities of the Company, such entity shall, by such supplemental
indenture, make provision so that the Securityholders of Securities of that series shall thereafter be entitled to receive upon conversion or exchange of such Securities the number of securities or property to which a holder of the number of shares
of common stock or other securities of the Company deliverable upon conversion or exchange of those Securities would have been entitled had such conversion or exchange occurred immediately prior to such consolidation, merger, sale, conveyance,
transfer or other disposition. 
 Section 10.02 Successor Entity Substituted. 

(a) In case of any such consolidation, merger, sale, conveyance, transfer or other disposition and upon the assumption by the
successor entity by supplemental indenture, executed and delivered to the Trustee and satisfactory in form to the Trustee, of the obligations set forth under Section 10.01 on all of the Securities of all series Outstanding, such successor
entity shall succeed to and be substituted for the Company with the same effect as if it had been named as the Company herein, and thereupon the predecessor corporation shall be relieved of all obligations and covenants under this Indenture and the
Securities. 
 (b) In case of any such consolidation, merger, sale, conveyance, transfer or other disposition, such
changes in phraseology and form (but not in substance) may be made in the Securities thereafter to be issued as may be appropriate. 
 (c) Nothing contained in this Article shall require any action by the Company in the case of a consolidation or merger of any Person into the Company where the Company is the survivor of such
transaction, or the acquisition by the Company, by purchase or otherwise, of all or any part of the property of any other Person (whether or not affiliated with the Company). 
 Section 10.03 Evidence of Consolidation, Etc. to Trustee. 
 The
Trustee, subject to the provisions of Section 7.01, may receive an Officers’ Certificate or an Opinion of Counsel as conclusive evidence that any such consolidation, merger, sale, conveyance, transfer or other disposition, and any such
assumption, comply with the provisions of this Article. 

  
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 ARTICLE 11 
 SATISFACTION AND DISCHARGE 
 Section 11.01 Satisfaction and
Discharge of Indenture. 
 If at any time: (a) the Company shall have delivered to the Trustee for cancellation
all Securities of a series theretofore authenticated and not delivered to the Trustee for cancellation (other than any Securities that shall have been destroyed, lost or stolen and that shall have been replaced or paid as provided in
Section 2.07 and Securities for whose payment money or Governmental Obligations have theretofore been deposited in trust or segregated and held in trust by the Company and thereupon repaid to the Company or discharged from such trust, as
provided in Section 11.05); or (b) all such Securities of a particular series not theretofore delivered to the Trustee for cancellation shall have become due and payable, or are by their terms to become due and payable within one year or
are to be called for redemption within one year under arrangements satisfactory to the Trustee for the giving of notice of redemption, and the Company shall deposit or cause to be deposited with the Trustee as trust funds the entire amount in moneys
or Governmental Obligations or a combination thereof, sufficient in the opinion of a nationally recognized firm of independent public accountants expressed in a written certification thereof delivered to the Trustee, to pay at maturity or upon
redemption all Securities of that series not theretofore delivered to the Trustee for cancellation, including principal (and premium, if any) and interest due or to become due to such date of maturity or date fixed for redemption, as the case may
be, and if the Company shall also pay or cause to be paid all other sums payable hereunder with respect to such series by the Company then this Indenture shall thereupon cease to be of further effect with respect to such series except for the
provisions of Sections 2.03, 2.05, 2.07, 4.01, 4.02, 4.03 and 7.10, that shall survive until the date of maturity or redemption date, as the case may be, and Sections 7.06 and 11.05, that shall survive to such date and
thereafter, and the Trustee, on demand of the Company and at the cost and expense of the Company shall execute proper instruments acknowledging satisfaction of and discharging this Indenture with respect to such series. 

Section 11.02 Discharge of Obligations. 
 If at any time all such Securities of a particular series not heretofore delivered to the Trustee for cancellation or that have not become due and payable as described in Section 11.01 shall have
been paid by the Company by depositing irrevocably with the Trustee as trust funds moneys or an amount of Governmental Obligations sufficient to pay at maturity or upon redemption all such Securities of that series not theretofore delivered to the
Trustee for cancellation, including principal (and premium, if any) and interest due or to become due to such date of maturity or date fixed for redemption, as the case may be, and if the Company shall also pay or cause to be paid all other sums
payable hereunder by the Company with respect to such series, then after the date such moneys or Governmental Obligations, as the case may be, are deposited with the Trustee the obligations of the Company under this Indenture with respect to such
series shall cease to be of further effect except for the provisions of Sections 2.03, 2.05, 2.07, 4,01, 4.02, 4,03, 7.06, 7.10 and 11.05 hereof that shall survive until such Securities shall mature and be paid. 

Thereafter, Sections 7.06 and 11.05 shall survive. 
 Section 11.03 Deposited Moneys to be Held in Trust. 
 All
moneys or Governmental Obligations deposited with the Trustee pursuant to Sections 11.01 or 11.02 shall be held in trust and shall be available for payment as due, either directly or through any paying agent (including the Company acting
as its own paying agent), to the holders of the particular series of Securities for the payment or redemption of which such moneys or Governmental Obligations have been deposited with the Trustee. 

Section 11.04 Payment of Moneys Held by Paying Agents. 

In connection with the satisfaction and discharge of this Indenture all moneys or Governmental Obligations then held by any paying agent
under the provisions of this Indenture shall, upon demand of the Company, be paid to the Trustee and thereupon such paying agent shall be released from all further liability with respect to such moneys or Governmental Obligations. 

  
 -31-

 Section 11.05 Repayment to Company. 

Any moneys or Governmental Obligations deposited with any paying agent or the Trustee, or then held by the Company, in trust for payment
of principal of or premium, if any, or interest on the Securities of a particular series that are not applied but remain unclaimed by the holders of such Securities for at least two years after the date upon which the principal of (and premium, if
any) or interest on such Securities shall have respectively become due and payable, or such other shorter period set forth in applicable escheat or abandoned or unclaimed property law, shall be repaid to the Company on May 31 of each year or
upon the Company’s request or (if then held by the Company) shall be discharged from such trust; and thereupon the paying agent and the Trustee shall be released from all further liability with respect to such moneys or Governmental
Obligations, and the holder of any of the Securities entitled to receive such payment shall thereafter, as a general creditor, look only to the Company for the payment thereof. 
 ARTICLE 12 
 IMMUNITY OF INCORPORATORS, 

STOCKHOLDERS, OFFICERS AND DIRECTORS 
 Section 12.01 No Recourse. 
 No recourse under or upon any
obligation, covenant or agreement of this Indenture, or of any Security, or for any claim based thereon or otherwise in respect thereof, shall be had against any incorporator, stockholder, officer or director, past, present or future as such, of the
Company or of any predecessor or successor corporation, either directly or through the Company or any such predecessor or 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 this Indenture and the obligations issued hereunder are solely corporate obligations, and that no such personal liability whatever shall attach to, or is or shall be incurred by, the
incorporators, stockholders, officers or directors as such, of the Company or of any predecessor or successor corporation, or any of them, because of the creation of the indebtedness hereby authorized, or under or by reason of the obligations,
covenants or agreements contained in this Indenture or in any of the Securities or implied therefrom; and that any and all such personal liability of every name and nature, either at common law or in equity or by constitution or statute, of, and any
and all such rights and claims against, every such incorporator, stockholder, officer or director as such, because of the creation of the indebtedness hereby authorized, or under or by reason of the obligations, covenants or agreements contained in
this Indenture or in any of the Securities or implied therefrom, are hereby expressly waived and released as a condition of, and as a consideration for, the execution of this Indenture and the issuance of such Securities. 

ARTICLE 13 

MISCELLANEOUS PROVISIONS 
 Section 13.01 Effect on Successors and Assigns. 
 All the
covenants, stipulations, promises and agreements in this Indenture made by or on behalf of the Company shall bind its successors and assigns, whether so expressed or not. 
 Section 13.02 Actions by Successor. 
 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 corresponding board, committee or officer of any
corporation that shall at the time be the lawful successor of the Company. 

  
 -32-

 Section 13.03 Surrender of Company Powers. 

The Company by instrument in writing executed by authority of 2/3 (two-thirds) its Board of Directors and delivered to the Trustee
may surrender any of the powers reserved to the Company, and thereupon such power so surrendered shall terminate both as to the Company and as to any successor corporation. 
 Section 13.04 Notices. 
 Except as otherwise expressly provided
herein, any notice, request or demand that by any provision of this Indenture is required or permitted to be given, made or served by the Trustee or by the holders of Securities or by any other Person pursuant to this Indenture to or on the Company
may be given or served by being deposited in first class mail, postage prepaid, addressed (until another address is filed in writing by the Company with the Trustee), as follows: Gevo, Inc., 345 Inverness Drive South, Building C, Suite 310,
Englewood, Colorado 80112, Attn: Chief Financial Officer. Any notice, election, request or demand by the Company or any Securityholder or by any other Person pursuant to this Indenture to or upon the Trustee shall be deemed to have been
sufficiently given or made, for all purposes, if given or made in writing at the Corporate Trust Office of the Trustee. 

Section 13.05 Governing Law. 
 This Indenture and each Security shall be deemed to be a contract made under the internal laws of the State of New York, and for all purposes shall be construed in accordance with the laws of said State,
except to the extent that the Trust Indenture Act is applicable. 
 Section 13.06 Treatment of Securities as
Debt. 
 It is intended that the Securities will be treated as indebtedness and not as equity for federal income tax
purposes. The provisions of this Indenture shall be interpreted to further this intention. 
 Section 13.07 Certificates
and Opinions as to Conditions Precedent. 
 (a) Upon any application or demand by the Company to the Trustee
to take any action under any of the provisions of this Indenture, the Company shall furnish to the Trustee an Officers’ Certificate stating that all conditions precedent provided for in this Indenture (other than the certificate to be delivered
pursuant to Section 13.12) relating to the proposed action have been complied with and an Opinion of Counsel stating that in the opinion of such counsel all such conditions precedent have been complied with, except that in the case of any such
application or demand as to which the furnishing of such documents is specifically required by any provision of this Indenture relating to such particular application or demand, no additional certificate or opinion need be furnished. 

(b) Each certificate or opinion provided for in this Indenture and delivered to the Trustee with respect to compliance with a
condition or covenant in this Indenture shall include (i) a statement that the Person making such certificate or opinion has read such covenant or condition; (ii) a brief statement as to the nature and scope of the examination or
investigation upon which the statements or opinions contained in such certificate or opinion are based; (iii) a statement that, in the opinion of such Person, he has made such examination or investigation as is reasonably necessary to enable
him to express an informed opinion as to whether or not such covenant or condition has been complied with; and (iv) a statement as to whether or not, in the opinion of such Person, such condition or covenant has been complied with. 

Section 13.08 Payments on Business Days. 
 Except as provided pursuant to Section 2.01 pursuant to a Board Resolution, and set forth in an Officers’ Certificate, or established in one or more indentures supplemental to this Indenture, in
any case where the date of maturity of interest or principal of any Security or the date of redemption of any Security shall not be a Business Day, then payment of interest or principal (and premium, if any) may be made on the next succeeding
Business Day with the same force and effect as if made on the nominal date of maturity or redemption, and no interest shall accrue for the period after such nominal date. 

  
 -33-

 Section 13.09 Conflict with Trust Indenture Act. 

If and to the extent that any provision of this Indenture limits, qualifies or conflicts with the duties imposed by Sections 310
to 317, inclusive, of the Trust Indenture Act, such imposed duties shall control. 
 Section 13.10
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. 
 Section 13.11 Separability.

 In case any one or more of the provisions contained in this Indenture or in the Securities of any series shall for any
reason be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Indenture or of such Securities, but this Indenture and such Securities shall be
construed as if such invalid or illegal or unenforceable provision had never been contained herein or therein. 

Section 13.12 Compliance Certificates. 
 The Company shall deliver to the Trustee, within 120 days after the end of each fiscal year during which any Securities of any series were outstanding, an officer’s certificate stating
whether or not the signers know of any Default or Event of Default that occurred during such fiscal year. Such certificate shall contain a certification from the principal executive officer, principal financial officer or principal accounting
officer of the Company that a review has been conducted of the activities of the Company and the Company’s performance under this Indenture and that the Company has complied with all conditions and covenants under this Indenture. For purposes
of this Section 13.12, such compliance shall be determined without regard to any period of grace or requirement of notice provided under this Indenture. If the officer of the Company signing such certificate has knowledge of such a Default or
Event of Default, the certificate shall describe any such Default or Event of Default and its status. 
 Section 13.13
U.S.A. Patriot Act. 
 The parties hereto acknowledge that in accordance with Section 326 of the U.S.A. Patriot
Act, the Trustee, like all financial institutions and in order to help fight the funding of terrorism and money laundering, is required to obtain, verify and record information that identifies each person or legal entity that establishes a
relationship or opens an account with the Trustee. The parties to this Indenture agree that they will provide the Trustee with such information as it may request in order for the Trustee to satisfy the requirements of the U.S.A. Patriot Act.

 Section 13.14 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 be reasonable efforts which are consistent with accepted practices in the banking industry to resume performance as soon as practicable under the
circumstances. 

  
 -34-

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

			
	GEVO, INC.
		
	By:	 	 /s/ Mark Smith

		 	Name: Mark Smith
		 	Title: Chief Financial Officer
	
	 WELLS FARGO BANK, NATIONAL ASSOCIATION
 As Trustee

		
	By:	 	 /s/ Michael Tu

		 	Name: Michael Tu
		 	Title: Assistant Vice President

 [SIGNATURE PAGE TO SENIOR DEBT SECURITIES] 

 CROSS-REFERENCE TABLE(1) 
  

					
	 Section of Trust Indenture
 Act of 1939, as Amended
	  	Section of Indenture	  	 
	310(a)	  	7.09	  	
	310(b)	  	7.08	  	
		  	7.10	  	
	310(c)	  	Inapplicable	  	
	311(a)	  	7.13	  	
	311(b)	  	7.13	  	
	311(c)	  	Inapplicable	  	
	312(a)	  	5.01	  	
		  	5.02(a)	  	
	312(b)	  	5.02(c)	  	
	312(c)	  	5.02(c)	  	
	313(a)	  	5.04(a)	  	
	313(b)	  	5.04(b)	  	
	313(c)	  	5.04(a)	  	
		  	5.04(b)	  	
	313(d)	  	5.04(c)	  	
	314(a)	  	5.03	  	
		  	13.12	  	
	314(b)	  	Inapplicable	  	
	314(c)	  	13.07(a)	  	
	314(d)	  	Inapplicable	  	
	314(e)	  	13.07(b)	  	
	314(f)	  	Inapplicable	  	
	315(a)	  	7.01(a)	  	
		  	7.01(b)	  	
	315(b)	  	7.14	  	
	315(c)	  	7.01	  	
	315(d)	  	7.01(b)	  	
	315(e)	  	6.07	  	
	316(a)	  	6.06	  	
		  	8.04	  	
	316(b)	  	6.04	  	
	316(c)	  	8.01	  	
	317(a)	  	6.02	  	
	317(b)	  	4.03	  	
	318(a)	  	13.09	  	

  

	(1)	This Cross-Reference Table does not constitute part of the Indenture and shall not have any bearing on the interpretation of any of its terms or provisions.

  
 -36-First Supplemental Indenture to the Indenture dated as of July 5, 2012

 Exhibit 4.2 
 Execution Copy 
 GEVO, INC. 

as Issuer 

AND 

WELLS FARGO BANK, NATIONAL ASSOCIATION 
 as Trustee 
 First Supplemental Indenture 

Dated as of July 5, 2012 
 to 
 Indenture dated as of July 5, 2012 

7.5% Convertible Senior Notes due 2022 

 TABLE OF CONTENTS 

 

							
	 	  	 	  	Page	 
			
	 ARTICLE 1
	  	 Certain Definitions and Provisions of General Application
	  	 	1	  
			
	 Section 1.01.
	  	 Definitions
	  	 	1	  
	 Section 1.02.
	  	 Conflicts With Base Indenture
	  	 	9	  
	 Section 1.03.
	  	 Section References
	  	 	9	  
			
	 ARTICLE 2
	  	 The Notes
	  	 	9	  
			
	 Section 2.01.
	  	 Designation and Terms of Notes
	  	 	9	  
	 Section 2.02.
	  	 Denominations
	  	 	10	  
	 Section 2.03.
	  	 Form and Dating
	  	 	10	  
	 Section 2.04.
	  	 CUSIP Numbers
	  	 	10	  
	 Section 2.05.
	  	 Ranking
	  	 	10	  
			
	 ARTICLE 3
	  	 Particular Covenants of the Company
	  	 	11	  
			
	 Section 3.01.
	  	 Payment of Principal and Interest
	  	 	11	  
	 Section 3.02.
	  	 Maintenance of Office or Agency
	  	 	12	  
	 Section 3.03.
	  	 Provisions as to Paying Agent
	  	 	12	  
	 Section 3.04.
	  	 Existence
	  	 	13	  
	 Section 3.05.
	  	 Commission Filings and Reports
	  	 	13	  
	 Section 3.06.
	  	 Book-Entry System
	  	 	14	  
	 Section 3.07.
	  	 Additional Interest
	  	 	14	  
	 Section 3.08.
	  	 Stay; Extension and Usury Laws
	  	 	14	  
	 Section 3.09.
	  	 Compliance Certificate
	  	 	14	  
			
	 ARTICLE 4
	  	 Repurchase at Option of the Holder
	  	 	15	  
			
	 Section 4.01.
	  	 Repurchase at the Option of the Holder Upon a Fundamental Change
	  	 	15	  
	 Section 4.02.
	  	 Repurchase of Notes at the Option of the Holder
	  	 	19	  
			
	 ARTICLE 5
	  	 Conversion of Notes
	  	 	23	  
			
	 Section 5.01.
	  	 Right to Convert
	  	 	23	  
	 Section 5.02.
	  	 Conversion Procedures
	  	 	23	  
	 Section 5.03.
	  	 Settlement Upon Conversion
	  	 	24	  
	 Section 5.04.
	  	 Adjustment of Conversion Rate
	  	 	25	  
	 Section 5.05.
	  	 Adjustments of Prices
	  	 	33	  
	 Section 5.06.
	  	 Adjustment to Conversion Rate Upon Conversion Upon Make-Whole Fundamental Changes
	  	 	33	  

							
	 Section 5.07.
	  	 Coupon Make-Whole Payment; Conversion On or After January 1, 2013 But Prior to July 1, 2017
	  	 	35	  
	 Section 5.08.
	  	 Taxes on Shares Issued
	  	 	35	  
	 Section 5.09.
	  	 Reservation of Shares; Shares to be Fully Paid; Compliance with Governmental Requirements
	  	 	35	  
	 Section 5.10.
	  	 Responsibility of Trustee
	  	 	36	  
	 Section 5.11.
	  	 Stockholder Rights Plan
	  	 	36	  
	 Section 5.12.
	  	 Company Determination Final
	  	 	36	  
			
	 ARTICLE 6
	  	 Redemption
	  	 	37	  
			
	 Section 6.01.
	  	 Right to Redeem; Notices to Trustee
	  	 	37	  
	 Section 6.02.
	  	 Optional Redemption
	  	 	37	  
	 Section 6.03.
	  	 Provisional Redemption
	  	 	37	  
	 Section 6.04.
	  	 Redemption Price
	  	 	37	  
	 Section 6.05.
	  	 Selection of Notes to be Redeemed
	  	 	38	  
	 Section 6.06.
	  	 Notice of Redemption
	  	 	38	  
	 Section 6.07.
	  	 Effect of Notice of Redemption
	  	 	39	  
	 Section 6.08.
	  	 Deposit of Redemption Price
	  	 	39	  
	 Section 6.09.
	  	 Notes Redeemed in Part
	  	 	40	  
			
	 ARTICLE 7
	  	 Events of Default and Remedies
	  	 	40	  
			
	 Section 7.01.
	  	 Events of Default
	  	 	40	  
	 Section 7.02.
	  	 Acceleration of Maturity; Rescission and Annulment
	  	 	42	  
	 Section 7.03.
	  	 Collection of Indebtedness and Suits for Enforcement by Trustee
	  	 	43	  
	 Section 7.04.
	  	 Trustee May File Proofs of Claim
	  	 	43	  
	 Section 7.05.
	  	 Trustee May Enforce Claims Without Possession of Notes
	  	 	44	  
	 Section 7.06.
	  	 Application of Money Collected
	  	 	44	  
	 Section 7.07.
	  	 Limitation on Suits
	  	 	44	  
	 Section 7.08.
	  	 Unconditional Right of Holders to Receive Principal and Interest and to Convert
	  	 	45	  
	 Section 7.09.
	  	 Restoration of Rights and Remedies
	  	 	45	  
	 Section 7.10.
	  	 Rights and Remedies Cumulative
	  	 	45	  
	 Section 7.11.
	  	 Delay or Omission Not Waiver
	  	 	46	  
	 Section 7.12.
	  	 Control by Holders
	  	 	46	  
	 Section 7.13.
	  	 Waiver of Past Defaults and Rescission
	  	 	46	  
	 Section 7.14.
	  	 Undertaking for Costs
	  	 	47	  
	 Section 7.15.
	  	 Waiver of Stay or Extension Laws
	  	 	47	  
	 Section 7.16.
	  	 Notice of Default
	  	 	48	  
			
	 ARTICLE 8
	  	 Consolidation, Merger, Conveyance, Transfer or Lease
	  	 	48	  
			
	 Section 8.01.
	  	 Company May Consolidate, Etc., Only on Certain Terms
	  	 	48	  
	 Section 8.02.
	  	 Successor Substituted
	  	 	49	  

  
 - iii -

							
	 ARTICLE 9
	  	 Satisfaction and Discharge
	  	 	49	  
			
	 Section 9.01.
	  	 Satisfaction and Discharge of Indenture
	  	 	49	  
			
	 ARTICLE 10
	  	 Supplemental Indentures
	  	 	50	  
			
	 Section 10.01.
	  	 Supplemental Indentures
	  	 	50	  
	 Section 10.02.
	  	 Supplemental Indentures Without Consent of Holders
	  	 	50	  
	 Section 10.03.
	  	 Supplemental Indentures with Consent of Holders
	  	 	51	  
			
	 ARTICLE 11
	  	 Miscellaneous
	  	 	52	  
			
	 Section 11.01.
	  	 Governing Law
	  	 	52	  
	 Section 11.02.
	  	 Calculations in Respect of Notes
	  	 	53	  
	 Section 11.03.
	  	 Confirmation of Indenture
	  	 	53	  
	 Section 11.04.
	  	 Counterparts
	  	 	53	  

  
 - iv -

 FIRST SUPPLEMENTAL INDENTURE dated as of July 5, 2012 (“Supplemental
Indenture”), to the Indenture dated as of July 5, 2012 (as amended, modified or supplemented from time to time in accordance therewith, the “Base Indenture” and, as amended, modified and supplemented by this
Supplemental Indenture, the “Indenture”), by and among GEVO, INC., a Delaware corporation (the “Company”) and WELLS FARGO BANK, NATIONAL ASSOCIATION as trustee (the “Trustee”). 

RECITALS OF THE COMPANY 
 WHEREAS, the Company has duly authorized the execution and delivery of the Base Indenture to provide for the issuance from time to time of senior debt securities (the “Securities”) to be
issued in one or more series as provided in the Base Indenture; 
 WHEREAS, Section 2.01 of the Base Indenture provides for
the Company to establish Securities of any series pursuant to an indenture supplemental, and Section 9.01(g) of the Base Indenture provides for the Company and the Trustee to enter into any such indenture supplemental to provide for the
issuance and establish the form or terms of Securities of such series as permitted by Section 2.01 of the Base Indenture without the consent of any Holders; 
 WHEREAS, the Board of Directors has duly adopted resolutions authorizing the Company to execute and deliver this Supplemental Indenture; 

WHEREAS, pursuant to the terms of the Indenture, the Company desires to provide for the establishment of a new series of its Securities
to be known as its “7.5% Convertible Senior Notes due 2022” (the “Notes”), the form and substance of the Notes and the terms, provisions and conditions thereof to be set forth as provided in the Indenture and this
Supplemental Indenture; 
 WHEREAS, the Company has requested that the Trustee execute and deliver this Supplemental Indenture,
and all requirements necessary to make (i) this Supplemental Indenture a valid and legally binding instrument in accordance with its terms and (ii) the Notes, when executed by the Company and authenticated and delivered by the Trustee, the
valid and legally binding obligations of the Company, have been performed, and the execution and delivery of this Supplemental Indenture has been duly authorized in all respects. 

NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH, for and in consideration of the premises and the purchases of the Notes by the
Holders thereof, it is mutually agreed, for the benefit of the Company and the equal and proportionate benefit of all Holders of the Notes, as follows: 
 Certain Definitions and Provisions of General Application 
 Section 1.01.
Definitions. Capitalized terms used herein and not otherwise defined herein have the meanings assigned to them in the Base Indenture. For all purposes of this Supplemental Indenture, except as otherwise provided or unless the context
otherwise requires: 
 (1) the terms defined in this Article 1 have the meanings assigned to them in this Article and include
the plural as well as the singular; 

 (2) all other terms used herein which are defined in the Trust Indenture Act, either
directly or by reference therein, have the meanings assigned to them therein; 
 (3) all accounting terms not otherwise defined
herein have the meanings assigned to them in accordance with generally accepted accounting principles, and, except as otherwise herein expressly provided, the term “generally accepted accounting principles” in the United States with
respect to any computation required or permitted hereunder shall mean such accounting principles as are generally accepted at the date of the Indenture; and 
 (4) the words “herein”, “hereof” and “hereunder” and other words of similar import refer to the Indenture as a whole and not to any particular Article, Section or other
subdivision. 
 As used herein, the following terms have the specified meanings: 

“Additional Interest” has the meaning specified in Section 7.02(b). 

“Additional Notes” means an unlimited maximum aggregate principal amount of Notes (other than the Initial Notes) issued
under this Supplemental Indenture. 
 “Additional Shares” has the meaning specified in Section 5.06(a).

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

“Applicable Procedures” with respect to any transfer or transaction involving a Global Note or beneficial interest
therein, the rules and procedures of DTC or any successor Depositary, in each case to the extent applicable to such transaction and as in effect from time to time. 
 “Business Day” means each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which banking institutions in the City of New York are authorized or obligated by law or
executive order to close. 

  
 2 

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

“Certificated Note” means a Note that is in substantially the form attached hereto as Exhibit A and that does not
include the information or the schedule called for by footnotes 1 and 2 thereof. 
 “Close of Business” means
5:00 p.m. New York City time. 
 “Commission” or “SEC” means the Securities and Exchange
Commission, as from time to time constituted, created under the Exchange Act, or, if at any time after the execution of the Indenture such Commission is not existing and performing the duties now assigned to it under the Trust Indenture Act, then
the body performing such duties at such time. 
 “Common Equity” of any corporation means the common stock,
common equity interests, ordinary shares or depositary shares or other certificates representing common equity interests of such corporation. 
 “Common Stock” means the shares of common stock, par value $0.01 per share, of the Company as they exist on the date of this Supplemental Indenture or any other shares of Capital Stock of
the Company into which the Common Stock shall be reclassified or changed or, in the event of a merger, consolidation or other similar transaction involving the Company that is otherwise permitted hereunder in which the Company is not the surviving
corporation, the Common Equity of such surviving corporation or its direct or indirect parent corporation. 

“Company’s Option Purchase Notice” has the meaning specified in Section 4.02. 

“Conversion Agent” means the person authorized by the Company to convert Notes in accordance with Article 5. 

“Conversion Date” has the meaning specified in Section 5.02. 

“Conversion Notice” has the meaning specified in Section 5.02(a). 

“Conversion Price” means at any time the amount equal to $1,000 divided by the then applicable Conversion Rate.

 “Conversion Rate” has the meaning specified in Section 5.01. 

“corporation” means a corporation, association, company, joint-stock company or business trust. 

“Coupon Make-Whole Payment” means a payment equal to the sum of the present values of the lesser of: (i) eight
semi-annual interest payments; or (ii) the number of semi-annual interest payments, that would have been payable on the Notes that a Holder has elected to 

  
 3 

 
convert from the last day through which interest was paid on such Notes, or the Issue Date if no interest has been paid, to but excluding July 1, 2017, computed using a discount rate equal
to 2.0%, subject to Section 5.07(d). 
 “Current Market Price” means the average of the Last Reported Sale
Prices of Common Stock over the ten consecutive Trading-Day period ending on the Trading Day immediately preceding the Ex-Date of the distribution requiring such computation. 
 “default” means any event, act or condition that with notice or lapse of time, or both, would constitute an Event of Default. 

“Depositary” means DTC until a successor Depositary shall have become such pursuant to the applicable provisions of the
Indenture, and thereafter “Depositary” shall mean such successor Depositary. 
 “DTC” means The
Depository Trust Company, a New York corporation, or any successor. 
 “Effective Date” means, with respect to
any issuance or distribution on Common Stock, the first date on which shares of Common Stock trade on the applicable exchange or in the applicable market, regular way, reflecting such issuance or distribution. 

“Expiration Date” has the meaning specified in Section 5.04(e). 

“Expiration Time” has the meaning specified in Section 5.04(e). 

“Event of Default” has the meaning specified in Section 7.01(b). 

“Exchange Act” means the Securities Exchange Act of 1934, as amended. 

“Ex-Date” means, with respect to any issuance or distribution on the Common Stock, the first date on which the shares of
the Common Stock trade on the applicable exchange or in the applicable market, regular way, without the right to receive such issuance or distribution. 
 “Fundamental Change” will be deemed to have occurred at the time after the Notes are originally issued that any of the following occurs: 

(1) if any “person” or “group” within the meaning of Section 13(d) of the Exchange Act other than the Company,
its Significant Subsidiaries or the Company’s or its Significant Subsidiaries’ employee benefit plans, becomes the direct or indirect “beneficial owner,” as defined in Rule 13d-3 under the Exchange Act, of the Company’s
Common Equity representing more than 50% of the voting power of the Company’s Common Equity; 
 (2) consummation of
(A) any recapitalization, reclassification or change of the Common Stock (other than changes resulting from a subdivision or combination) as a result of 

  
 4 

 
which the Common Stock would be converted into, or exchanged for, stock, other securities, other property or assets or (B) any share exchange, consolidation or merger of the Company pursuant
to which the Common Stock will be converted into cash, securities or other property or any conveyance, transfer, sale, lease or other disposition in one transaction or a series of transactions of all or substantially all of the consolidated assets
of the Company and its Significant Subsidiaries, taken as a whole, to any person other than one of the Company’s Significant Subsidiaries; provided, however, that a transaction pursuant to which the holders of 50% or more of the
total voting power of all classes of the Company’s Common Equity immediately prior to such transaction have the right to exercise 50% or more of the total voting power of all shares of Common Equity of the continuing or surviving corporation
(or any parent thereof) entitled to vote generally in elections of directors of such corporation (or any parent thereof) immediately after such event shall not be a Fundamental Change; 

(3) the following persons cease for any reason to constitute a majority of the Company’s Board of Directors: 

(A) individuals who on the first Issue Date constituted the Company’s Board of Directors; and 

(B) any new directors whose election to the Company’s Board of Directors or whose nomination for election by the Company’s
stockholders was approved by at least a majority of the Company’s directors then still in office either who were directors on such first Issue Date or whose election or nomination for election was previously so approved; 

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

(5) the Common Stock (or other common stock into which the Notes are then convertible) ceases to be listed on any of the NASDAQ Global
Market, the NASDAQ Global Select Market, the NASDAQ Capital Market or the New York Stock Exchange or other national securities exchange. 
 A Fundamental Change as a result of clause (1) or (2) above will not be deemed to have occurred, however, if at least 90% of the consideration paid for the Common Stock, excluding cash payments
for fractional shares and cash payments made pursuant to dissenters’ appraisal rights, in the transaction or transactions constituting the Fundamental Change consists of shares of common stock listed on any of the NASDAQ Global Market, NASDAQ
Global Select Market, NASDAQ Capital Market or the New York Stock Exchange (or any of their respective successors) or that will be so listed immediately following such Fundamental Change (these securities being referred to as “publicly
traded securities”) and as a result of such transaction or transactions the Notes become convertible into such publicly traded securities on the basis set forth under Section 5.04(m), subject to Section 5.02. 

“Fundamental Change Expiration Time” has the meaning specified in Section 4.01(c). 

  
 5 

 “Fundamental Change Notice” has the meaning specified in
Section 4.01(b). 
 “Fundamental Change Repurchase Date” has the meaning specified in
Section 4.01(a). 
 “Fundamental Change Repurchase Notice” has the meaning specified in
Section 4.01(a). 
 “Fundamental Change Repurchase Price” has the meaning specified in
Section 4.01(a). 
 “Global Note” means a permanent Global Note that is in substantially the form attached
hereto as Exhibit A and that includes the information and schedule called for by footnotes 1 and 2 thereof and which is deposited with the Depositary or its custodian and registered in the name of the Depositary or its nominee. 

“Holder” means a Person in whose name a Note is registered in the Security Register. 

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

“Interest Payment Date” means each January 1 and July 1 of each year, beginning January 1, 2013.

 “Issue Date” with respect to the Initial Notes means July 5, 2012, and with respect to any Additional
Notes, the date of original issuance of such Additional Notes. 
 “Last Reported Sale Price” of the Common
Stock on any date means (i) 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 by the NASDAQ Global Market; or (ii) if the Common Stock is not listed for trading on the NASDAQ Global Market, 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;
or (iii) if the Common Stock is not listed for trading on a U.S. national or regional securities exchange, the closing 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) for the Common Stock on that date as reported by the OTC Bulletin Board; or (iv) if not so reported by the OTC Bulletin Board, the last quoted bid price for the Common
Stock in the over-the-counter market on that date as reported by OTC Markets Group, Inc. or a similar organization; or (v) if the Common Stock is not so quoted by OTC Markets Group, Inc. or a similar organization, 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. The Last Reported Sale Price of the Common Stock will be determined
without reference to extended or after-hours trading. If, during a period applicable for calculating the Last Reported Sale Price of 

  
 6 

 
the Common Stock, an event occurs that requires an adjustment to the Conversion Rate, the Last Reported Sale Price shall be calculated for such period in a manner determined by the Company to
appropriately reflect the impact of such event on the price of the Common Stock during such period. 
 “Make-Whole
Fundamental Change” means any transaction or event that constitutes a Fundamental Change pursuant to clause (1), (2) (disregarding the proviso in clause (2)), (3), (4) and (5) under the definition of Fundamental Change
pursuant to which 10% or more of the consideration for the Common Stock (other than cash payments for preferred shares and cash payments made in respect of dissenters’ appraisal rights) in such Fundamental Change transaction consists of cash or
securities (or other property) that are not shares of Common Stock, depositary receipts or other certificates representing common equity interests traded or scheduled to be traded immediately following such transaction on a U.S. national securities
exchange. 
 “Make-Whole Reference Date” has the meaning in Section 5.06(b). 

“Market Disruption Event” means to the extent the Common Stock is listed for trading on the NASDAQ Global Market or
listed on another U.S. national or regional securities exchange, (i) a failure by the primary U.S. national or regional securities exchange or market on which the Common Stock is listed or admitted to trading to open for trading during its
regular trading session or (ii) the occurrence or existence during the one-half hour period ending on the scheduled close of trading on any Trading Day of any material suspension or limitation imposed on trading (by reason of movements in price
exceeding limits permitted by the stock exchange or otherwise) in the Common Stock or in any options, contracts or future contracts relating to the Common Stock. 
 “Maturity Date” means July 1, 2022. 
 “Merger
Event” has the meaning specified in Section 5.04(m). 
 “Note” and “Notes” have
the meaning specified in the Recitals and include the Initial Notes and any Additional Notes. The Initial Notes and Additional Notes shall be treated as a single class for all purposes under the Indenture. 

“Open of Business” means 9:00 a.m. New York City time. 

“Option Purchase Date” has the meaning specified in Section 4.02(a). 

“Option Purchase Notice” has the meaning specified in Section 4.02(a). 

“Option Purchase Price” has the meaning specified in Section 4.02(a). 

“Optional Redemption” has the meaning specified in Section 6.02. 

  
 7 

 “Paying Agent” means any Person authorized by the Company to pay the
principal of or interest on any Notes on behalf of the Company. 
 “Provisional Redemption” has the meaning
specified in Section 6.03. 
 “Purchase at Holder’s Option” has the meaning specified in
Section 4.02(a). 
 “Purchase Notice” means a Purchase Notice in the form set forth in the Notes.

 “Redemption Date” means the date, which shall be a Business Day, specified for redemption of the Notes in
accordance with the terms of the Notes and Article 6. 
 “Redemption Notice” has the meaning specified in
Section 6.06. 
 “Redemption Price” has the meaning specified in Section 6.04. 

“Reference Property” has the meaning specified in Section 5.04(m). 

“Regular Record Date” for the interest payable on any Interest Payment Date means the December 15 or June 15
(whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. 
 “Reporting
Default” has the meaning specified in Section 7.02(b). 
 “Securities Act” means the Securities
Act of 1933, as amended. 
 “Securities Custodian” means the Trustee, as custodian with respect to the Global
Securities, or any successor thereto. 
 “Significant Subsidiaries” means any direct or indirect subsidiary of
the Company within the meaning of Section 1-02(w) of Regulation S-X as promulgated by the Commission. 

“Spin-Off” has the meaning specified in Section 5.04(c). 

“Stated Maturity”, when used with respect to any Security, means the date specified in such Security as the fixed date
on which the principal of such Security is due and payable. 
 “Stock Price” has the meaning specified in
Section 5.06(b). 
 “Trading Day” means a day during which (i) the NASDAQ Global Market is open for
trading, or if the Common Stock is not listed for trading on the NASDAQ Global Market, the principal U.S. national or regional securities exchange on which the Common Stock is listed is open for trading, or if the Common Stock is not so quoted or
listed, any Business Day; and (ii) there is no Market Disruption Event. 
 “Valuation Period” has the
meaning specified in Section 5.04(c). 

  
 8 

 “VWAP” means with respect to any Coupon Make-Whole Payment, the per share
volume-weighted average price as displayed under the heading “Bloomberg VWAP” on Bloomberg page GEVO.Q <equity> AQR, or any successor page, in respect of the period from 9:30 a.m. to 4:00 p.m., New York City time, on such Conversion
Date, or if such volume-weighted average price is unavailable, the market value per share of Common Stock (or one unit of Reference Property consisting of marketable equity securities) on such Conversion Date as determined by a nationally recognized
independent investment banking firm retained for this purpose by the Company. 
 Section 1.02. Conflicts With Base
Indenture. If any provision of this Supplemental Indenture limits, qualifies or conflicts with a provision of the Base Indenture, such provision of this Supplemental Indenture shall control. 

Section 1.03. Section References. References to Articles, Sections, Exhibits, Annexes and Schedules are to Articles,
Sections, Exhibits, Annexes and Schedules of this Supplemental Indenture unless otherwise specified. 
 The Notes 

Section 2.01. Designation and Terms of Notes. There is hereby created and designated a series of Securities under the Base
Indenture. The title of the Notes shall be “7.5% Convertible Senior Notes Due 2022.” The changes, modifications and supplements to the Base Indenture effected by this Supplemental Indenture shall be applicable only with respect to, and
govern the terms of, the Notes and shall not apply to any other series of Securities that may be issued under the Base Indenture unless a supplemental indenture with respect to such other series of Securities specifically incorporates such changes,
modifications and supplements. 
 The aggregate principal amount of the Notes that initially may be authenticated and delivered
under this Supplemental Indenture (the “Initial Notes”) shall be limited to $45,000,000, subject to increase as set forth in Section 10.02(g). 
 The Notes shall mature on July 1, 2022. 
 The Notes shall bear interest at
the rate of 7.5% per annum, from July 5, 2012 or from the most recent Interest Payment Date to which interest has been paid or duly provided for, as the case may be, semi-annually in arrears, on January 1 and July 1 of each year,
commencing on January 1, 2013. Interest (including Additional Interest, if any) will be computed on the basis of a 360-day year comprised of twelve 30-day months. If an Interest Payment Date is not a Business Day, payment will be made on the
next succeeding Business Day and no additional interest will accrue thereon. Pursuant to Section 7.02(b), in certain circumstances, the Holders of Notes shall be entitled to receive Additional Interest. Interest (including Additional Interest,
if any) will cease to accrue on a Note upon the Maturity Date, conversion, redemption or repurchase by the Company at the option of the Holder pursuant to Article 4. 

  
 9 

 Principal and interest (including Additional Interest, if any) on Global Notes shall be
payable in the manner set forth in Section 3.01. 
 The Notes shall be convertible as provided in Article 5. 

Section 2.02. Denominations. The Notes initially shall be issuable only in book-entry form without coupons and only in
denominations of $1,000 and any integral multiple thereof. 
 Section 2.03. Form and Dating. (a) The Notes and
the Trustee’s certificate of authentication shall be substantially in the form set forth in Exhibit A, which Exhibit is incorporated in and made part of the Indenture. The Notes may have notations, legends or endorsements required by
law, exchange rule, Applicable Procedures or usage. The Company shall provide any such notations, legends or endorsements to the Trustee in writing. Each Note shall be dated the date of its authentication. 

(b) Global Notes. All of the Notes shall be issued initially in the form of one or more Global Notes, which shall be deposited on behalf
of the purchasers of the Notes represented thereby with the Trustee, at its Corporate Trust Office, as custodian for the Depositary and registered in the name of its nominee, Cede & Co., or as otherwise instructed by the Depositary duly
executed by the Company and authenticated by the Trustee as hereinafter provided. The aggregate principal amount of the Global Notes may from time to time be increased or decreased by adjustments made on the records of the Securities Custodian and
the Depositary as hereinafter provided, subject in each case to compliance with the Applicable Procedures and the provisions of the Indenture. 
 (c) Certificated Notes. Certificated Notes will be issued only under the limited circumstances in which definitive registered form of the Securities may be issued as provided in Section 2.11(c) of
the Base Indenture. 
 Section 2.04. CUSIP Numbers. The Company in issuing the Notes may use one or more
“CUSIP” numbers (if then generally in use), and, if so, the Trustee shall use “CUSIP” numbers in notices of purchase as a convenience to Holders; provided, however, 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 as contained in any notice and that reliance may be placed only on the other identification numbers printed on the Notes, and any such notice shall not be affected by any
defect in or omission of such numbers. The Company shall without unreasonable delay provide written notice to the Trustee of any change in the “CUSIP” numbers. 
 Section 2.05. Ranking. The obligations of the Company arising under or in connection with the Indenture and every outstanding Note 

  
 10 

 
issued under the Indenture from time to time constitute and shall constitute a general unsecured senior obligation of the Company, ranking equally in right of payment with existing and future
senior unsecured indebtedness of the Company and ranking senior in right of payment to any future indebtedness of the Company that is expressly made subordinate to the Notes by the terms of such indebtedness. 

Particular Covenants of the Company 
 Section 3.01. Payment of Principal and Interest. 
 (a) The Company
covenants and agrees that it shall duly and punctually pay or cause to be paid the principal of and interest (including Additional Interest, if any), on each of the Notes at the places, at the respective times and in the manner provided herein and
in the Notes. All references to “interest” in the Indenture are deemed to include Additional Interest if any, but without duplication. 
 (b) On the Maturity Date, each Holder will be entitled to receive on such date $1,000 in cash for each $1,000 in principal amount of Notes, together with accrued and unpaid interest to, but not including,
the Maturity Date, unless earlier converted, repurchased or redeemed. With respect to Global Notes, principal and interest will be paid to the Depositary in immediately available funds. With respect to any Certificated Notes, principal and interest
will be payable at the office or agency maintained by the Company for such purpose, which initially shall be the Corporate Trust Office of the Trustee. 
 (c) The Company will pay or cause to be paid interest on: 
 (i) Global Notes to
the Depositary in immediately available funds; 
 (ii) any Certificated Notes having a principal amount of less than
$1,000,000, by check mailed to the holders of those notes; provided, however, at maturity, interest will be payable as described in Section 3.01(b); and 
 (iii) any Certificated Notes having a principal amount of $1,000,000 or more, by wire transfer in immediately available funds at the election of the Holders of those Notes duly delivered to the Trustee at
least five business days prior to the relevant interest payment date; provided, however, at maturity, interest will be payable as described in Section 3.01(b). 
 Subject to Section 3.01(b) and Section 5.03(b), interest will be paid to the person in whose name a Note is registered at the Close of Business on December 15 or June 15, as the case
may be, immediately preceding the relevant Interest Payment Date. 

  
 11 

 Section 3.02. Maintenance of Office or Agency. The Company shall maintain an
office or agency where the Notes may be surrendered for registration of transfer or exchange or for presentation for payment or for conversion and where notices and demands to or upon the Company in respect of the Notes and the Indenture may be
served. The Company shall give prompt written notice to the Trustee of the location, and any change in the location, of such office or agency not designated or appointed by the Trustee. 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, and the Company hereby appoints the Trustee as its
agent to receive all such presentations, surrenders, notices and demands. 
 The Company may also from time to time designate
co-registrars and one or more 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. 

The Company will give prompt written notice of any such designation or rescission and of any change in the location of any such other
office or agency. 
 The Company hereby initially designates the Trustee as Paying Agent, Security Registrar, Securities
Custodian and Conversion Agent. 
 Section 3.03. Provisions as to Paying Agent. 

(a) If the Company shall appoint a Paying Agent other than the Trustee, or if the Trustee shall appoint such a Paying Agent, the Company
will cause such Paying Agent to execute and deliver to the Trustee an instrument in which such Paying Agent shall agree with the Trustee, subject to the provisions of this Section 3.03 that such Paying Agent will: 

(i) comply with the duties applicable to a paying agent under the Trust Indenture Act; and 

(ii) during the continuance of any default by the Company (or any other obligor upon the Notes) in the making of any payment in respect
of the Notes, upon the written request of the Trustee, forthwith pay to the Trustee all sums held in trust by such Paying Agent as such. 
 The Company shall, on or before each due date of the principal of or interest (including Additional Interest, if any) on the Notes, deposit with the Paying Agent a sum (in funds which are immediately
available on the due date for such payment) sufficient to pay such principal or interest, and (unless such Paying Agent is the Trustee) the Company will promptly notify the Trustee in writing of any failure to take such action; provided,
however, that if such deposit is made on the due date, such deposit shall be received by the Paying Agent by 10:00 a.m. New York City time, on such date. 

  
 12 

 (b) If the Company shall act as its own Paying Agent, it will, on or before each due date of
the principal of or 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 or interest (including Additional Interest, if any) so becoming due and will
promptly notify the Trustee of any failure to take such action and of any failure by the Company (or any other obligor under the Notes) to make any payment of the principal of or interest (including Additional Interest, if any) on the Notes when the
same shall become due and payable. 
 (c) Anything in this Section 3.03 to the contrary notwithstanding, the Company may,
at any time, for the purpose of obtaining a satisfaction and discharge of the Indenture, or for any other reason, pay or cause to be paid to the Trustee all sums held in trust by the Company or any Paying Agent hereunder as required by this
Section 3.03, such sums to be held by the Trustee upon the trusts herein contained, and upon such payment by the Company or any Paying Agent to the Trustee, the Company or such Paying Agent shall be released from all further liability with
respect to such sums. 
 (d) Anything in this Section 3.03 to the contrary notwithstanding, the agreement to hold sums in
trust as provided in this Section 3.03 is subject to Section 11.05 of the Base Indenture. 
 The Trustee shall not be
responsible for the actions of any other Paying Agents (including the Company if acting as its own Paying Agent) and shall have no control of any funds held by such other Paying Agents. 

Section 3.04. Existence. Subject to Article 8, the Company will do or cause to be done all things necessary to preserve and
keep in full force and effect its existence and rights (charter and statutory); provided, however, that the Company shall not be required to preserve any such right if the Company shall determine that the preservation thereof is no longer
desirable in the conduct of the business of the Company and that the loss thereof is not disadvantageous in any material respect to the Holders of the Notes. 
 Section 3.05. Commission Filings and Reports. So long as any Notes are outstanding, the Company shall deliver to the Trustee, within 15 calendar days after the Company would have been required
to file with the Commission (giving effect to any grace period provided by Rule 12b-25 under the Exchange Act), copies of the Company’s annual reports and of the information, documents and other reports (or copies of such portions of any of the
foregoing as the Commission may by rules and regulations prescribe) which the Company is required to file with the Commission pursuant to Section 13 or 15(d) of the Exchange Act. Documents filed by the Company with the Commission via its EDGAR
system (or any successor thereto) will be deemed to be filed with the Trustee as of the time such documents are so filed. In the event the Company is at any time no longer subject to the reporting requirements of Section 13 or 15(d) of the
Exchange Act, it shall continue to provide the Trustee with reports containing substantially the same information as would have been required to be filed with the Commission had the Company continued to

  
 13 

 
have been subject to such reporting requirements. In such event, such reports shall be provided at the times the Company would have been required to provide reports had it continued to have been
subject to such reporting requirements. The Company also shall comply with the other provisions of Section 314(a) of the Trust Indenture Act and will furnish to Holders, beneficial owners and prospective purchasers of the Notes or shares of
Common Stock issuable upon conversion of the Notes, upon their request, the information required to be delivered pursuant to Rule 144A(d)(4) under the Securities Act. Delivery of such reports, information and documents 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 rely exclusively on Officers’ Certificates); provided, however, that the Trustee shall have no responsibility whatsoever to determine whether such filings or postings have
been made. 
 Section 3.06. Book-Entry System. If the Notes cease to trade in the Depositary’s book-entry
settlement system, the Company covenants and agrees that it shall use reasonable efforts to make such other book entry arrangements that it determines are reasonable for the Notes. 

Section 3.07. Additional Interest. If at any time Additional Interest becomes payable by the Company pursuant to
Section 7.02, the Company shall promptly deliver to the Trustee a certificate to that effect and stating (i) the amount of such Additional Interest that is payable and (ii) the date on which such Additional Interest is payable. Unless
and until a Responsible Officer of the Trustee receives such a certificate, the Trustee may assume without inquiry that no Additional Interest is payable. If the Company has paid Additional Interest directly to the Persons entitled to such
Additional Interest, the Company shall deliver to the Trustee a certificate setting forth the particulars of such payment. 

Section 3.08. 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 which would prohibit or forgive the Company from paying all or any portion of the principal of
or interest (including Additional Interest, if any) on the Notes as contemplated herein, wherever enacted, now or at any time hereafter in force, or which may affect the covenants or the performance of the 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 3.09. Compliance
Certificate. The Company shall deliver to the Trustee, within one hundred twenty (120) days after the end of each fiscal year of the Company, an Officers’ Certificate, stating whether or not to the

  
 14 

 
knowledge of the signer thereof the Company is in default in the performance and observance of any of the terms, provisions and conditions of the Indenture (without regard to any period of grace
or requirement of notice provided hereunder) and, if the Company shall be in default, specifying all such defaults and the nature and the status thereof of which the signer may have knowledge. 

Any notice required to be given under this Section 3.09 shall be delivered to a Responsible Officer of the Trustee at its Corporate
Trust Office. 
 Repurchase at Option of the Holder 
 Section 4.01. Repurchase at the Option of the Holder Upon a Fundamental Change. 
 (a) If a Fundamental Change occurs at any time, then each Holder shall have the right, at such Holder’s option, to require the Company to repurchase all of such Holder’s Notes, or any portion
thereof that is an integral multiple of $1,000 principal amount, for cash on the date (the “Fundamental Change Repurchase Date”) specified by the Company that is not less than 20 Business Days and not more than 35 Business Days
after the date of the Fundamental Change Notice (as defined below) at a repurchase price equal to 100% of the principal amount thereof, together with any accrued and unpaid interest thereon to, but excluding, the Fundamental Change Repurchase Date
(unless the Fundamental Change Repurchase Date is between a Regular Record Date and the Interest Payment Date to which it relates, in which case the Company will pay the full interest amount payable on such Interest Payment Date to the record holder
as of such Regular Record Date) (the “Fundamental Change Repurchase Price”). 
 Repurchases of Notes under this
Section 4.01 shall be made, at the option of the Holder thereof, upon: 
 (i) if the Notes are held in certificated form,
delivery to the Paying Agent by a Holder of a duly completed Purchase Notice (the “Fundamental Change Repurchase Notice”) in the form set forth in the Note or, if the Notes are held in global form, a notice that complies with the
Applicable Procedures, prior to the Close of Business on the Business Day immediately preceding the Fundamental Change Repurchase Date, subject to extension to comply with applicable law; and 

(ii) delivery or book-entry transfer of the Notes (together with all necessary endorsements) to the Paying Agent at any time after
delivery of the Fundamental Change Repurchase Notice and prior to the Close of Business on the Business Day immediately preceding the Fundamental Change Repurchase Date, subject to extension to comply with applicable law, at the Corporate Trust
Office of the Paying Agent, such delivery being a 

  
 15 

 
condition to receipt by the Holder of the Fundamental Change Repurchase Price therefor; provided that such Fundamental Change Repurchase Price shall be so paid pursuant to this
Section 4.01 only if the Note so delivered to the Paying Agent shall conform in all respects to the description thereof in the related Fundamental Change Repurchase Notice. 

The Fundamental Change Repurchase Notice shall state: 
 (A) if certificated, the certificate numbers of Notes to be delivered for repurchase; 
 (B) the portion of the principal amount of Notes to be repurchased, which must be $1,000 or an integral multiple thereof; and 
 (C) that the Notes are to be repurchased by the Company pursuant to the applicable provisions of the Notes and the Indenture; 
 provided, however, that if the Notes are not in certificated form, the Fundamental Change Repurchase Notice must comply with the Applicable Procedures. 

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 in accordance with the provisions of subsection (c) of this Section 4.01. 
 Any Note that is to be
repurchased only in part shall be surrendered to the Trustee (with, if the Company or the Trustee so requires, due endorsement by, or a written instrument of transfer in form satisfactory to the Company duly executed by the Holder thereof or his
attorney duly authorized in writing), and the Company shall execute, and the Trustee shall authenticate and make available for delivery to the Holder of such Note without service charge, a new Note or Notes, containing identical terms and
conditions, each in an authorized denomination in aggregate principal amount equal to and in exchange for the unrepurchased portion of the principal of the Note so surrendered. 

(b) On or before the 15th calendar day after the occurrence of a Fundamental Change, the Company shall provide to all Holders of record
of the Notes and the Trustee and Paying Agent a written notice (the “Fundamental Change Notice”) of the occurrence of such Fundamental Change and of the repurchase right, if any, at the option of the Holders arising as a result
thereof. 
 Each Fundamental Change Notice shall specify (if applicable): 

(i) the events causing the Fundamental Change; 
 (ii) the date of the Fundamental Change; 

  
 16 

 (iii) the last date on which a Holder may exercise its repurchase rights under
Section 4.01; 
 (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; 
 (vii)
the applicable Conversion Rate and any adjustments to the applicable 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 the Indenture; 

(ix) that the Holder must exercise its repurchase right by the Close of Business on the Business Day immediately preceding the
Fundamental Change Repurchase Date; 
 (x) that the Holder has the right to withdraw any Notes tendered for repurchase prior to
the Close of Business on the Business Day immediately preceding the Fundamental Change Repurchase Date; and 
 (xi) the
procedures the Holder must follow to require the Company to purchase its Notes under Section 4.01. 
 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 4.01. 

(c) A Fundamental Change Repurchase Notice may be withdrawn (in whole or in part) by a written notice of withdrawal delivered to the
Paying Agent at any time prior to the Close of Business on the Business Day prior to the Fundamental Change Repurchase Date (the “Fundamental Change Expiration Time”), specifying: 

(i) the principal amount of the withdrawn Notes; 
 (ii) if Certificated Notes have been issued, the certificate numbers of the withdrawn Notes; and 

  
 17 

 (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 an integral multiple of $1,000; 

provided, however, that if the Notes are not in certificated form, the notice must comply with the Applicable Procedures.

 (d) On or prior to 10:00 a.m., New York City time, on the Fundamental Change Repurchase Date, the Company shall deposit with
the Paying Agent (or, if the Company is acting as its own Paying Agent, segregate and hold in trust as provided in Section 7.05 of the Base Indenture) an amount of money sufficient to repurchase on the Fundamental Change Repurchase Date all of
the Notes to be repurchased on such date at the Fundamental Change Repurchase Price. Subject to receipt of funds by the Paying Agent, payment for Notes properly surrendered for repurchase (and not withdrawn) prior to the Fundamental Change
Expiration Time shall be made promptly on or after the later of (x) the Fundamental Change Repurchase Date with respect to such Note (provided the Holder has satisfied the conditions to the payment of the Fundamental Change Repurchase Price in
this Section 4.01), and (y) the time of book-entry transfer or the delivery of such Note to the Paying Agent by the Holder thereof in the manner required by this Section 4.01 by mailing checks for the amount payable to the Holders of
such Notes entitled thereto as they shall appear in the Security Register; provided, however, that all payments shall be subject to Section 4.01(a) and payments to the Depositary shall be made by wire transfer of immediately
available funds to the account of the Depositary or its nominee. The Paying Agent shall, promptly after such payment and upon written demand by the Company, return to the Company any funds in excess of the Fundamental Change Repurchase Price.

 (e) If the Paying Agent holds money sufficient to repurchase on the Fundamental Change Repurchase Date all the Notes or
portions thereof that are to be purchased on the Fundamental Change Repurchase Date, then: (i) such Notes shall cease to be outstanding and interest shall cease to accrue on such Notes (whether or not book-entry transfer of the Notes is made or
whether or not the Note is delivered or transferred to the Paying Agent), and (ii) all other rights of the Holders of such Notes shall terminate other than the right to receive the Fundamental Change Repurchase Price and previously accrued and
unpaid interest upon delivery or transfer of the Notes. 
 (f) No Notes may be repurchased at the option of Holders upon a
Fundamental Change if there has occurred and is continuing an Event of Default other than an Event of Default that is cured by the payment of the Fundamental Change Repurchase Price of the Notes. 

(g) In connection with any repurchase upon the occurrence of a Fundamental Change, to the extent required by applicable law, the Company
shall: 
 (i) comply with the provisions of Rule 13e-4, Rule 14e-1 and any other tender offer rules under the Exchange Act that
may then be applicable; and 

  
 18 

 (ii) otherwise comply with all federal and state securities laws as necessary to effect a
repurchase of Notes by the Company at the option of such Holder. 
 Section 4.02. Repurchase of Notes at the Option of
the Holder. 
 (a) At the option of the Holder thereof, Notes (or portions thereof that are integral multiples of $1,000 in
principal amount) shall be purchased by the Company pursuant to this section on July 1, 2017 (the “Option Purchase Date”), at a purchase price, payable in cash, equal to one hundred percent (100%) of the principal amount
of the Notes (or such portions thereof) to be so purchased (the “Option Purchase Price”), plus accrued and unpaid interest, if any, to, but excluding, the Option Purchase Date (provided, that such accrued and unpaid interest shall
be paid to the Holder of record of such Notes at the Close of Business on the record date immediately preceding such Option Purchase Date), upon: 
 (i) delivery to the Company (if it is acting as its own Paying Agent), or to a Paying Agent designated by the Company for such purpose in the Company’s Option Purchase Notice (as defined below), by
such Holder, at any time from the Open of Business on the date that is twenty (20) Business Days prior to the Option Purchase Date until the Close of Business on the Business Day immediately preceding the applicable Option Purchase Date, of a
duly completed Purchase Notice (the “Option Purchase Notice”), in the form set forth in the Notes or any other form of written notice substantially similar thereto, stating: 

(A) the certificate number(s) of the Notes which the Holder will deliver to be purchased, if such Notes are in certificated form;

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

(C) that such principal amount of Notes are to be purchased as of the applicable Option Purchase Date pursuant to the terms and
conditions specified in paragraph 8 of the Notes and in this Indenture; and 
 (ii) delivery to the Company (if it is acting as
its own Paying Agent), or to a Paying Agent designated by the Company for such purpose in the Company’s Option Purchase Notice, at any time after delivery of an Option Purchase Notice, of such Notes (together with all necessary endorsements),
such delivery being a condition to receipt by the Holder of the Option Purchase Price therefor plus accrued and unpaid interest, if any, payable as herein provided upon redemption of the Notes with respect to a repurchase at the Holder’s
option, in accordance with this Section 4.02 (a “Purchase at Holder’s Option”) (provided, however, that the Holder of record of such Notes on the record date immediately preceding such Option Purchase Date need not
surrender such Notes in order to be entitled to receive, on the Option Purchase Date, the accrued and unpaid interest due thereon). 

  
 19 

 If such Notes are held in book-entry form through the Depositary, the Option Purchase Notice
shall comply with Applicable Procedures. 
 Upon such delivery of Notes to the Company (if it is acting as its own Paying Agent)
or such Paying Agent, such Holder shall be entitled to receive from the Company or such Paying Agent, as the case may be, a nontransferable receipt of deposit evidencing such delivery. 

Notwithstanding anything herein to the contrary, any Holder that has delivered the Option Purchase Notice contemplated by this
Section 4.02(a) to the Company (if it is acting as its own Paying Agent) or to a Paying Agent designated by the Company for such purpose in the Company’s Option Purchase Notice shall have the right to withdraw such Option Purchase Notice
by delivery, at any time prior to the Close of Business on the Business Day immediately preceding the Option Purchase Date, of a written notice of withdrawal to the Company (if acting as its own Paying Agent) or the Paying Agent, which notice shall
contain the information specified in Section 4.02(b)(vii). 
 The Paying Agent shall promptly notify the Company of the
receipt by it of any Option Purchase Notice or written notice of withdrawal thereof. 
 (b) The Company shall give notice (the
“Company’s Option Purchase Notice”) on a date not less than twenty (20) Business Days prior to the Option Purchase Date to each Holder at its address shown in the register of the Registrar and to each beneficial owner as
required by applicable law. Such notice shall state: 
 (i) the Option Purchase Price plus accrued and unpaid interest, if any,
to, but excluding, such Option Purchase Date and the Conversion Rate; 
 (ii) the names and addresses of the Paying Agent and
the Conversion Agent; 
 (iii) that Notes with respect to which an Option Purchase Notice is given by a Holder may be converted
pursuant to Article 5 only if such Option Purchase Notice has been withdrawn in accordance with this Section 4.02 or if there shall be a Default in the payment of such Option Purchase Price or in accrued and unpaid interest, if any, payable as
herein provided upon Purchase at Holder’s Option; 
 (iv) that Notes must be surrendered to the Paying Agent to collect
payment of the Option Purchase Price plus (if such Holder was the Holder of record of the applicable Note at the Close of Business on the record date immediately preceding the Option Purchase Date) accrued and unpaid interest, if any, payable as
herein provided upon Purchase at Holder’s Option; 
 (v) that the Option Purchase Price, plus accrued and unpaid interest,
if any, to, but excluding, such Option Purchase Date, for any Note as to which an Option Purchase Notice has been given and not withdrawn will be paid as promptly as practicable, but in no event

  
 20 

 
later than the later of such Option Purchase Date or the time of delivery of the Note as described in clause (iv) above; provided, however, that such accrued and unpaid interest shall
be paid, on the applicable interest payment date, to the Holder of record of such Note at the Close of Business on the record date immediately preceding such Option Purchase Date; 

(vi) the procedures the Holder must follow to exercise rights under this Section 4.02 (including the name and address of the Paying
Agent) and a brief description of those rights; 
 (vii) that a Holder will be entitled to withdraw its election in the Option
Purchase Notice if the Company (if acting as its own Paying Agent) or the Paying Agent receives, at any time prior to the Close of Business on the Business Day immediately preceding the applicable Option Purchase Date, or such longer period as may
be required by law, a letter or telegram, telex or facsimile transmission (receipt of which is confirmed and promptly followed by a letter) setting forth: 
 (A) the name of such Holder; 
 (B) a statement that such Holder is withdrawing
its election to have Notes purchased by the Company on such Option Purchase Date pursuant to a Purchase at Holder’s Option; 
 (C) the certificate number(s) of such Notes to be so withdrawn, if such Notes are in certificated form; 
 (D) the principal amount of the Notes of such Holder to be so withdrawn, which amount must be $1,000 or an integral multiple thereof; and 

(E) the principal amount, if any, of the Notes of such Holder that remain subject to the Option Purchase Notice delivered by such Holder
in accordance with this Section 4.02, which amount must be $1,000 or an integral multiple thereof; 
 (viii) that, except
as otherwise provided herein, on and after the applicable Option Purchase Date (unless there shall be a Default in the payment of the consideration payable as herein provided upon a Purchase at Holder’s Option), interest on Notes subject to
Purchase at Holder’s Option will cease to accrue, and all rights of the Holders of such Notes shall terminate, other than the right to receive, in accordance herewith, the consideration payable as herein provided upon a Purchase at
Holder’s Option; and 
 (ix) the CUSIP number or numbers, as the case may be, of the Notes. 

(c) Subject to the provisions of this Section 4.02, the Company shall pay, or cause to be paid, the Option Purchase Price, plus
accrued and unpaid interest, if any, to, but excluding, the applicable Option Purchase Date, with respect to each Note subject to Purchase at Holder’s Option to the Holder thereof as promptly as practicable, but in no event later than the

  
 21 

 
later of the applicable Option Purchase Date and the time such Note (together with all necessary endorsements) is surrendered to the Paying Agent; provided, however, that such accrued and
unpaid interest shall be paid, on the applicable interest payment date, to the Holder of record of such Note at the Close of Business on the record date immediately preceding such Option Purchase Date. 

(d) Prior to 10:00 A.M., New York City time on the applicable Option Purchase Date, the Company shall deposit with a Paying Agent (or, if
the Company is acting as its own Paying Agent, segregate and hold in trust as provided in Section 7.05 of the Base Indenture) money, in funds immediately available on the applicable Option Purchase Date, sufficient to pay the Option Purchase
Price, plus accrued and unpaid interest, if any, to, but excluding, such Option Purchase Date, of all of the Notes that are to be purchased by the Company on such Option Purchase Date pursuant to a Purchase at Holder’s Option. The Paying Agent
shall return to the Company, as soon as practicable, any money not required for that purpose. 
 (e) Once the Option Purchase
Notice has been duly delivered in accordance with this Section 4.02, the Notes to be purchased pursuant to the Purchase at Holder’s Option shall, on the applicable Option Purchase Date, become due and payable in accordance herewith, and,
on and after such date (unless there shall be a Default in the payment of the consideration payable as herein provided upon a Purchase at Holder’s Option), except as otherwise herein provided, such Notes shall cease to bear interest, and all
rights of the Holders of such Notes shall terminate, other than the right to receive, in accordance herewith, such consideration. 
 (f) Notes with respect to which an Option Purchase Notice has been duly delivered in accordance with this Section 4.02 may be converted pursuant to Article 5, if otherwise convertible in accordance
with Article 5, only if such Option Purchase Notice has been withdrawn in accordance with this Section 4.02 or if there shall be a Default in the payment of the consideration payable as herein provided upon a Purchase at Holder’s Option.

 (g) If any Note subject to Purchase at Holder’s Option shall not be paid in accordance herewith, the principal of, and
accrued and unpaid interest on, such Note shall, until paid, bear interest, payable in cash, at the rate borne by such Note on the principal amount of such Note, and such Note shall continue to be convertible pursuant to Article 5. 

(h) Any Note which is to be submitted for Purchase at Holder’s Option only in part shall be delivered pursuant to this
Section 4.02 (with, if the Company so requires, due endorsement by, or a written instrument of transfer in form satisfactory to the Company duly executed by, the Holder thereof or its attorney duly authorized in writing), and the Company shall
execute, and the Trustee shall authenticate and make available for delivery to the Holder of such Note without service charge, a new Note or Notes, of any authorized denomination as requested by such Holder, of the same tenor and in aggregate
principal amount equal to the portion of such Note not submitted for Purchase at Holder’s Option. 

  
 22 

 (i) Notwithstanding anything herein to the contrary, there shall be no purchase of any Notes
pursuant to this Section 4.02 if the principal amount of the Notes has been accelerated pursuant to Section 7.02 and such acceleration shall not have been rescinded on or before the applicable Option Purchase Date. The Paying Agent will
promptly return to the respective Holders thereof any Notes tendered to it for Purchase at Holder’s Option during the continuance of such an acceleration. 
 (j) Notwithstanding anything herein to the contrary, if the option granted to Holders to require the purchase of the Notes on the applicable Option Purchase Date is determined to constitute a tender
offer, the Company shall comply with all applicable tender offer rules under the Exchange Act, including Rule 13e-4 and Regulation 14E thereunder, and with all other applicable laws, and will file a Schedule TO or any other schedules required under
the Exchange Act or any other applicable laws. 
 Conversion of Notes 

Section 5.01. Right to Convert. Subject to and upon compliance with the procedures for conversion set forth in this Article
5, a Holder shall have the right, at such Holder’s option, to convert the principal amount of any such Notes, or any portion of such principal amount which is $1,000 or an integral multiple thereof, into Common Stock at an initial conversion
rate (the “Conversion Rate”) equivalent to 175.6697 shares of Common Stock per $1,000 principal amount of Notes, subject to adjustment as set forth in Section 5.04, at any time prior to the Close of Business on the third
Business Day immediately preceding the Maturity Date. The number of shares of Common Stock issuable upon conversion of a Note shall be determined as set forth in Section 5.03. 

Section 5.02. Conversion Procedures. The following procedures shall apply to the conversion of Notes: 

(a) In respect of Certificated Notes, a Holder must: 
 (i) complete and manually sign the conversion notice attached to the Note (the “Conversion Notice”), or facsimile of such Conversion Notice; 

(ii) deliver such Conversion Notice, which is irrevocable, and the Note to the Conversion Agent at the office maintained by the
Conversion Agent; 
 (iii) furnish endorsements and transfer documents as may be required by the Conversion Agent and, if
required pursuant to Section 5.08 below, pay all transfer or similar taxes; and 
 (iv) if required pursuant to
Section 5.03(b), pay funds equal to interest payable on the next Interest Payment Date. 

  
 23 

 (b) In respect of a beneficial interest in a Global Note, a Beneficial owner must comply
with Applicable Procedures for converting a beneficial interest in a Global Note and, if required pursuant to Section 5.03(b), pay funds equal to interest payable on the next Interest Payment Date and all taxes or duties, if any. 

The date a Holder satisfies the foregoing requirements is the “Conversion Date” hereunder. 

If a Holder converts Notes, the Company will pay any documentary, stamp or similar issue or transfer tax due on the issuance of any
shares of Common Stock upon the conversion, unless the tax is due because the Holder requests any shares to be issued in a name other than the Holder’s name, in which case the Holder will pay that tax. 

No Note may be surrendered for conversion by a Holder thereof if such Holder has also tendered a Fundamental Change Repurchase Notice or
an Option Purchase Notice and not validly withdrawn such notice in accordance with the applicable provisions of Section 4.01 or Section 4.02, as applicable, unless the Company defaults in the payment of the repurchase price. 

Upon surrender of a Note that is converted in part, the Company shall execute, and the Trustee or the Authenticating Agent shall
authenticate and deliver to the Holder, a new Note in an authorized denomination equal in principal amount to the unconverted portion of the Note surrendered. 
 Section 5.03. Settlement Upon Conversion. 
 (a) Settlement Methods.
Upon any conversion of any Note, the Company shall deliver to converting Holders, in respect of each $1,000 principal amount of Notes tendered for conversion, on the third Trading Day immediately following the Conversion Date (or, if earlier, on
the Maturity Date), a number of shares of Common Stock equal to the Conversion Rate on the relevant Conversion Date (plus cash in lieu of fractional shares if applicable). 
 (b) Payment of Interest Upon Conversion. 
 (i) Upon conversion, Holders
shall not receive any additional cash payment or shares of Common Stock for accrued and unpaid interest, except as described in Section 5.03(b)(ii) and Section 5.07. Upon conversion, accrued and unpaid interest to the Conversion Date is
deemed to be paid in full rather than cancelled, extinguished or forfeited. 
 (ii) If any Note is converted after the Close of
Business on a Regular Record Date for an Interest Payment Date but prior to the corresponding Interest Payment Date, Holders of record of such Note at the Close of Business on such Regular Record Date will receive on the corresponding Interest
Payment Date the interest accrued and unpaid on such Notes, notwithstanding the conversion prior to the Interest Payment Date. Notes surrendered for conversion during the period from the Close of Business on any Regular Record Date to the

  
 24 

 
Open of Business on the immediately following Interest Payment Date must be accompanied by funds equal to the amount of interest payable on such Interest Payment Date for the Notes so converted;
provided that no such payment need be made: 
 (A) for conversions after the Close of Business on January 1, 2013 and
before the Close of Business on June 30, 2017; 
 (B) for conversions after the Close of Business on June 15, 2022,
which is the Regular Record Date for the Maturity Date; 
 (C) if the Company has specified a Fundamental Change Repurchase
Date that is after a Regular Record Date and prior to the corresponding Interest Payment Date; 
 (D) if the Company has
specified a Redemption Date that is after a Regular Record Date and prior to the corresponding Interest Payment Date; or 
 (E)
to the extent of any overdue interest, if any overdue interest exists at the time of conversion with respect to such Note. 

(c) Cash Payments in Lieu of Fractional Shares. The Company shall not issue fractional shares upon conversion of the Notes. If
multiple Notes shall be surrendered for conversion at one time by the same Holder, the number of full shares which shall be issuable upon conversion (and the number of fractional shares, if any, for which cash shall be delivered) shall be computed
on the basis of the aggregate principal amount of the Notes (or specified portions thereof to the extent permitted hereby) so surrendered. If any fractional share would be issuable upon the conversion of any Notes, the Company shall make payment an
amount in cash for the current market value of the fractional shares. The current market value of a fractional share shall be determined based on the Last Reported Sale Price per share of Common Stock on the Trading Day immediately preceding the
Conversion Date. 
 Section 5.04. Adjustment of Conversion Rate. 

The Conversion Rate shall be adjusted from time to time by the Company if any of the following events occurs as described below, except
that the Company will not make any adjustment to the Conversion Rate if Holders may participate in the transaction as a result of holding the Notes, without having to convert their Notes, on a basis equivalent to a holder of a number of shares of
Common Stock equal to the principal amount of Notes held divided by the applicable Conversion Price. This exception will not apply to any adjustment to Conversion Rate upon conversion upon a Make-Whole Fundamental Change as described in
Section 5.06. In no event will the Company adjust the Conversion Rate to the extent that the adjustment would reduce the Conversion Price below the par value per share of Common Stock. 

  
 25 

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

							
	CR1 = 
CR0	 	x	 	 OS1
	  	
		 		 	OS0	  	

 where, 
  

					
	CR0	 	=	  	the Conversion Rate in effect immediately prior to the Open of Business on the Ex-Date of such dividend or distribution, or immediately prior to the Open of Business on the
Effective Date of such share split or share combination, as applicable;
			
	CR1	 	=	  	the Conversion Rate in effect immediately after the Open of Business on such Ex-Date or immediately after the Open of Business on such Effective Date, as
applicable;
			
	OS0	 	=	  	the number of shares of Common Stock outstanding immediately prior to the Open of Business on such Ex-Date or immediately prior to the Open of Business on such Effective Date, as
applicable; and
			
	OS1	 	=	  	the number of the shares of Common Stock outstanding immediately after giving effect to such dividend, distribution, share split or share combination.

 Any adjustment made under this Section 5.04(a) shall become effective (x) immediately after the Open of
Business on the Ex-Date for such dividend or distribution, or (y) the Effective Date for such share split or share combination. If any dividend or distribution of the type described in this Section 5.04(a) is declared but is not so paid or
made, the Conversion Rate shall be immediately readjusted, effective as of the date the Company’s Board of Directors (or a committee thereof) determines not to pay such dividend or distribution, to the Conversion Rate that would then be in
effect if such dividend, distribution, share split or share combination had not been declared or announced. 
 (b) If the
Company distributes to all or substantially all holders of Common Stock any rights, options or warrants (other than pursuant to a stockholder rights plan adopted by the Company) entitling such holders for a period of not more than 60 calendar days
to subscribe for or purchase shares of Common Stock at a price per share less than the Current Market Price of Common Stock, the Conversion Rate will be adjusted based on the following formula: 

 

							
	CR1 = 
CR0	 	x	 	 OS0+X
	  	
		 		 	OS0+Y	  	

  
 26 

 where 
  

					
	CR0	 	=	  	the Conversion Rate in effect immediately prior to the Open of Business on the Ex-Date for such issuance;
			
	CR1	 	=	  	the Conversion Rate in effect immediately after the Open of Business on such Ex-Date;
			
	OS0	 	=	  	the number of shares of Common Stock outstanding immediately prior to the Open of Business on such Ex-Date;
			
	X	 	=	  	the total number of shares of Common Stock issuable pursuant to such rights, options or warrants; and
			
	Y	 	=	  	the number of shares of Common Stock equal to the aggregate price payable to exercise such rights, options or warrants divided by the Current Market Price.

 Any adjustment made pursuant to this Section 5.04(b) shall be made successively whenever any such rights, options or
warrants are distributed and shall become effective immediately after the Open of Business on the Ex-Date for such distribution. If such rights, options or warrants described in this Section 5.04(b) are not so distributed, the Conversion Rate
shall be readjusted to the Conversion Rate that would then be in effect if such Ex-Date for such distribution had not occurred. To the extent that such rights, options or warrants are not exercised prior to their expiration or shares of Common Stock
are otherwise not delivered pursuant to such rights, options or warrants upon the exercise of such rights, options or warrants, the Conversion Rate shall be readjusted to the Conversion Rate that would then be in effect had the adjustments made upon
the issuance of such rights, options or warrants been made on the basis of the delivery of only the number of shares of Common Stock actually delivered. 
 For purposes of this clause (b), in determining the aggregate price payable for shares of such Common Stock, there shall be taken into account any consideration received by the Company for such rights,
options or warrants and the value of such consideration, if other than cash, to be determined by the Company’s Board of Directors (or a committee thereof). 
 (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 the Company’s Capital
Stock or other securities, to all or substantially all holders of Common Stock, excluding: 
 (i) any dividends or
distributions referred to in Section 5.04(a) or Section 5.04(e); 
 (ii) any rights, options or warrants referred to
in Section 5.04(b); 
 (iii) except as otherwise described below, rights issued pursuant to a stockholder rights plan
adopted by the Company, or the detachment of such rights under the terms of such rights plan; 
 (iv) any dividends or
distributions paid referred to in Section 5.04(d); 

  
 27 

 (v) any dividends or distributions in connection with a Merger Event resulting in a change
in the conversion consideration pursuant to Section 5.04(m); and 
 (vi) any Spin-Off to which the provisions set forth in
this Section 5.04(c) shall apply; 
 then the Conversion Rate will be adjusted based on the following formula: 

 

							
	CR1 = 
CR0	 	x	 	 SP0
	  	
		 		 	SP0-FMV	  	

 where, 
  

					
	CR0	 	=	  	the Conversion Rate in effect immediately prior to the Open of Business on the Ex-Date for such distribution;
			
	CR1	 	=	  	the Conversion Rate in effect immediately after the Open of Business on such Ex-Date;
			
	SP0	 	=	  	the Current Market Price; and
			
	FMV	 	=	  	the fair market value (as determined by the Company’s Board of Directors (or a committee thereof)) on the Ex-Date for such distribution of the shares of Capital Stock,
evidences of indebtedness, or other assets or property of the Company so distributed, expressed as an amount per share of Common Stock.

 With respect to an adjustment pursuant to this Section 5.04(c) where there has been a payment of a
dividend or other distribution on Common Stock of any class or series of, or similar equity interest in, a Significant Subsidiary or other business unit of the Company (a “Spin-Off”), that are, or when issued will be, quoted or
listed on any securities exchange or other market, the Conversion Rate will instead be adjusted based on the following formula: 
  

							
	CR1 = 
CR0	 	x	 	 FMV0+MP0
	  	
		 		 	MP0	  	

 where, 
  

					
	CR0	 	=	  	the Conversion Rate in effect immediately prior to the Close of Business on the last Trading Day of the Valuation Period (as defined below);
			
	CR1	 	=	  	the Conversion Rate in effect immediately after the Close of Business or the last Trading Day of the Valuation Period;
			
	FMV0	 	=	  	the average of the Last Reported Sale Prices of the Capital Stock or similar equity interest distributed to holders of Common Stock applicable to one share of Common Stock over the
ten consecutive Trading-Day period commencing on, and including, the Ex-Date of the Spin-Off (the “Valuation Period”); and
			
	MP0	 	=	  	the average of the Last Reported Sale Prices of the Common Stock over the Valuation Period.

  
 28 

 The adjustment to the Conversion Rate under the preceding paragraph shall occur at the Close
of Business on the last Trading Day of the Valuation Period, but will be given effect as of the Open of Business on the Ex-Date for the Spin-Off; provided that in respect of any conversion during the Valuation Period, references within this
clause (c) to 10 Trading Days shall be deemed replaced with such lesser number of Trading Days as have elapsed between the Ex-Date of such Spin-Off and the Conversion Date in determining the applicable Conversion Rate. 

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

							
	CR1 = 
CR0	 	x	 	 SP0
	  	
		 		 	SP0-C	  	

 where, 
  

					
	CR0	 	=	  	the Conversion Rate in effect immediately prior to the Open of Business on the Ex-Date for such dividend or distribution;
			
	CR1	 	=	  	the Conversion Rate in effect immediately after the Open of Business on the Ex-Date for such dividend or distribution;
			
	SP0	 	=	  	the Current Market Price; and
			
	C	 	=	  	the amount in cash per share the Company distributes to holders of Common Stock.

 (e) If the Company or any Significant Subsidiary of the Company makes a payment in respect of a tender
offer or exchange offer for Common Stock subject to the tender offer rules, to the extent that the cash and value of any other consideration included in the payment per share of Common Stock exceeds the Last Reported Sale Price of the Common Stock
on the Trading Day immediately succeeding the last date (the “Expiration Date”) on which tenders or exchanges may be made pursuant to such tender offer or exchange offer, the Conversion Rate will be adjusted based on the following
formula: 
  

							
	CR1 = 
CR0	 	x	 	 FMV+(SP1xOS1)
	  	
		 		 	OS0
xSP1	  	

  
 29 

 where, 
  

					
	CR0	 	=	  	the Conversion Rate in effect immediately prior to the Close of Business on the Expiration Date;
			
	CR1	 	=	  	the Conversion Rate in effect immediately after the Expiration Date;
			
	FMV	 	=	  	the fair market value (as determined by the Company’s Board of Directors (or a committee thereof)), on the Expiration Date, of the aggregate value of all cash and any other
consideration paid or payable for shares of Common Stock validly tendered or exchanged and not withdrawn as of the Expiration Date;
			
	OS0	 	=	  	the number of shares of Common Stock outstanding immediately prior to the last time tenders or exchanges may be made pursuant to such tender offer or exchange offer (the
“Expiration Time”);
			
	OS1	 	=	  	the number of shares of Common Stock outstanding immediately after the Expiration Time (after giving effect to the purchase of all shares of Common Stock accepted for purchase
exchange in such tender offer or exchange offer); and
			
	SP1	 	=	  	the average of the Last Reported Sale Prices of Common Stock over the ten consecutive Trading-Day period commencing on, and including, the Trading Day immediately following the
Expiration Date.

 Any adjustment made pursuant to this clause (e) shall become effective immediately prior to the Open
of Business on the Trading Day immediately following the Expiration Date; provided that in respect of any conversion within 10 Trading Days immediately following, and including, the expiration date of any tender or exchange offer, references
with respect to 10 Trading Days shall be deemed replaced with such lesser number of Trading Days as have elapsed between the expiration date of such tender or exchange offer and the Conversion Date in determining the applicable Conversion Rate.

 In the event that the Company or one of its Subsidiaries is obligated to purchase shares of Common Stock pursuant to any such
tender offer or exchange offer, but the Company, or any such Significant Subsidiary, is permanently prevented by applicable law from effecting any such purchases, or all such purchases are rescinded, then the Conversion Rate shall be adjusted to be
the Conversion Rate which would then be in effect if such tender offer or exchange offer had not been made. Except as set forth in the preceding sentence, if the application of the formula in this Section 5.04(e) to any tender offer or exchange
offer would result in a decrease in the Conversion Rate, no adjustment shall be made for such tender offer or exchange offer under this Section 5.04(e). 
 (f) If: 
 (i) any distribution or transaction described in Section 5.04(a),
(b), (c), (d) or (e) above has not yet resulted in an adjustment to the applicable Conversion Rate on the Trading Day in question, and 
 (ii) the shares that the Holder will receive on settlement are not entitled to participate in the relevant distribution or transaction (because they were not held on a related record date or otherwise),

 then promptly after such distribution or transaction has occurred, the Company will adjust the number of shares of Common Stock that it
delivers to the Holder as it determines is appropriate 

  
 30 

 
to reflect the relevant distribution or transaction. In addition, if a Conversion Rate adjustment becomes effective on any Ex-Date as described above, and a Holder that has converted its Notes
would become the record Holder of shares of Common Stock as of the related Conversion Date pursuant to Section 5.03 based on an adjusted Conversion Rate for such Ex-Date, then, notwithstanding the Conversion Rate adjustment provisions above,
the Conversion Rate adjustment relating to such Ex-Date will not be made for such converting Holder. Instead, such Holder will be deemed to be the record owner of shares on un-adjusted basis and participate in the related dividend, distribution or
other event giving rise to such adjustment or, if no holders of Common Stock affirmatively make such election, the types and amounts of consideration actually received by such holders. 

(G) [RESERVED] 

(h) For purposes of Sections 5.04(c) and 5.04(d), except with respect to a Spin-Off, in cases where the fair market value of assets, debt
securities or certain rights, warrants or options to purchase the Company’s securities, or the amount of the cash dividend or distribution applicable to one share of Common Stock, distributed to all or substantially all shareholders:

 (i) equals or exceeds the average of the Last Reported Sale Prices of Common Stock over the relevant consecutive Trading-Day
period ending on the Trading Day immediately preceding the Ex-Date for such distribution; or 
 (ii) such average Last Reported
Sale Price exceeds the fair market value of such assets, debt securities or rights, warrants or options or the amount of cash so distributed by less than $1.00, 
 rather than being entitled to an adjustment in the Conversion Rate, the Holder of a Note will be entitled to receive upon conversion, in addition to the consideration such Holder is entitled to receive
upon conversion, the kind and amount of assets, debt securities or rights, warrants or options comprising the distribution, if any, that such Holder would have received if such Holder had held a number of shares of Common Stock equal to the
principal amount of the Notes held divided by the Conversion Price in effect immediately prior to the Ex-Date for determining the shareholders entitled to receive the distribution; provided that if the Company’s Board of Directors determines
fair market value for purposes of any such adjustment by reference to the actual or when issued trading market for any securities, it must in doing so consider the prices in such market over the same period used in computing Current Market Price.

 (i) Except as described herein, the Company will not adjust the Conversion Rate for the issuance of shares of Common Stock,
including in connection with satisfaction of the Company’s conversion obligation, or any securities convertible into or exchangeable for shares of Common Stock or the right to purchase shares of Common Stock or such convertible or exchangeable
securities. In addition, the Conversion Rate will 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 securities of the Company and the investment of additional optional amounts in shares of Common Stock under any plan; 

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

(iii) upon the issuance of any shares of Common Stock pursuant to any option, warrant, right or exercisable, exchangeable or convertible
security not described in the preceding clause (ii) and outstanding as of the date the Notes were first issued; 
 (iv)
for a change in the par value of Common Stock; or 
 (v) for accrued and unpaid interest on the Notes, if any. 

(j) The Company is permitted, to the extent permitted by law and the rules of The NASDAQ Global Market or any other securities exchange
on which the Common Stock is then listed, to increase the Conversion Rate of the Notes by any amount for a period of at least 20 Business Days if the Company’s Board of Directors (or a committee thereof) determines that such increase would be
in the Company’s best interest. The Company may also (but is not required to) increase the Conversion Rate to avoid or diminish income tax to holders of Common Stock or rights to purchase shares of Common Stock in connection with a dividend or
distribution of shares of Common Stock (or rights to acquire shares of Common Stock) or similar event. 
 (k) The Company shall
not take any voluntary action that would result in an adjustment pursuant to any of the provisions in this Section 5.04, Section 5.06 or Section 6.02 without complying, if applicable, with the stockholder approval rules of the NASDAQ
Global Stock Market (including NASDAQ Market Rule 5635, which requires stockholder approval of certain issuances of Common Stock) or any similar rule of any other stock exchange on which Common Stock is listed at the relevant time. 

(l) Adjustments to the applicable Conversion Rate shall be calculated to the nearest one ten-thousandth (1/10,000th) of a share. The
Company will not be required to make an adjustment in the Conversion Rate unless such adjustment would require a change of at least 1% in the applicable Conversion Rate. However, the Company will carry forward any adjustments that are less than 1%
of the Conversion Rate and make such carried-forward adjustments on each Conversion Date for any Notes. 
 (m) In the event (a
“Merger Event”) of: 
 (i) any reclassification of the Common Stock; 

  
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 (ii) any Fundamental Change described in clause (2) of the definition thereof;

 (iii) a share exchange, consolidation, or merger involving the Company; or 

(iv) a conveyance, transfer, sale, lease or other disposition to another person of all or substantially all of the Company’s
assets, 
 in which holders of Common Stock received cash, securities or other property (the “Reference Property”) in exchange
for their shares of Common Stock, the Notes will become convertible based on the type and amount of consideration that the Holders of a number of shares of Common Stock equal to the principal amount of the Notes divided by the Conversion Price would
have received in such Merger Event. For purposes of the foregoing, the type and amount of consideration that a holder of Common Stock received in the case of Merger Event that cause Common Stock to be exchanged for more than a single type of
consideration (determined based in part upon any form of shareholder election) will be deemed to be the weighted average of the types and amounts of consideration received by the holders of Common Stock that affirmatively made such an election.

 Section 5.05. Adjustments of Prices. Whenever any provision of the Indenture requires the Company to calculate a
number of shares of Common Stock equal to a sum or an average of the Last Reported Sale Price over multiple days, the Company will make appropriate adjustments to account for any adjustment to the Conversion Rate that becomes effective, or any event
requiring an adjustment to the Conversion Rate where the Ex-Date of the event occurs, at any time during the period from which the sum or average is to be calculated. 
 Section 5.06. Adjustment to Conversion Rate Upon Conversion Upon Make-Whole Fundamental Changes 
 (a) If a Make-Whole Fundamental Change occurs and a Holder elects to convert its Notes prior to July 1, 2017 following the effective date of such Make-Whole Fundamental Change, the Company shall
increase the Conversion Rate for the Notes so surrendered for conversion by a number of additional shares of Common Stock (the “Additional Shares”) as described below. 

(b) The number of Additional Shares by which the Conversion Rate will be increased shall be determined by reference to the table attached
as Schedule A hereto, based on the date on which the Make-Whole Fundamental Change occurs or becomes effective (the “Make-Whole Reference Date”) and the price (the “Stock Price”) paid per share of Common
Stock in the Make-Whole Fundamental Change. If holders of Common Stock receive only cash in a Make-Whole Fundamental Change, the Stock Price shall be the cash amount paid per share. Otherwise, the Stock Price shall be the average of the Last
Reported Sale Prices of the Common Stock over the five consecutive Trading Day period ending on, and including, the Trading Day preceding the relevant Make-Whole Reference Date. 

  
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 (c) The Stock Prices set forth in the column headings of the table in Schedule A
hereto shall be adjusted as of any date on which the Conversion Rate of the Notes is otherwise adjusted. The adjusted Stock Prices shall equal the Stock Prices immediately prior to such adjustment, multiplied by a fraction, the numerator of which is
the Conversion Rate immediately prior to the adjustment giving rise to the Stock Price adjustment and the denominator of which is the Conversion Rate as so adjusted. The number of Additional Shares set forth in Schedule A shall be adjusted in
the same manner as the Conversion Rate as set forth in Section 5.04. 
 (d) If either of the exact Stock Price or the
Make-Whole Reference Date is not be set forth in the table in Schedule A: 
 (i) If the Stock Price is between two
adjacent Stock Price amounts in the table or the Make-Whole Reference Date is between two adjacent Make-Whole Reference Dates in the table, the number of Additional Shares by which the Conversion Rate will be increased will be determined by a
straight-line interpolation between the number of Additional Shares set forth for the higher and lower Stock Price amounts and the two Make-Whole Reference Dates, as applicable, based on a 365-day year. 

(ii) If the Stock Price is greater than $20.00 per share (subject to adjustment in the same manner as the Stock Prices as set forth in
the column headings of the table in Schedule A), no Additional Shares will be added to the Conversion Rate. 
 (iii) If
the Stock Price is less than $4.95 per share (subject to adjustment in the same manner as the Stock Prices as set forth in the column headings of the table in Schedule A), no Additional Shares will be added to the Conversion Rate. 

Notwithstanding the foregoing, in no event shall the Conversion Rate exceed 202.0202 per $1,000 principal amount of Notes, subject
to adjustments in the same manner as the Conversion Rate as set forth in Section 5.04. 
 (e) If a Holder of Notes elects
to convert its Notes prior to the effective date of any Make-Whole Fundamental Change, such Holder shall not be entitled to an increased Conversion Rate in connection with such conversion. 

(f) Any conversion that entitles the converting Holder to an increase in the Conversion Rate as described in this Section 5.06 shall
be settled as described under Section 5.03. 
 (g) The Company will notify Holders, the Trustee and the Conversion Agent in
writing of the effective date of any Make-Whole Fundamental Change no later than 20 days after such effective date which may be included in the Fundamental Change Notice. 

  
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 Section 5.07. Coupon Make-Whole Payment Upon Conversion On or After January 1,
2013 But Prior to July 1, 2017. 
 (a) In the event a Holder elects to exercise its right to convert its Notes pursuant
to this Article 5, and such election occurs on or after January 1, 2013 but prior to July 1, 2017, such Holder shall be entitled to receive, in addition to the consideration that such Holder is entitled to receive upon conversion, a Coupon
Make-Whole Payment. 
 (b) The Company may pay any Coupon Make-Whole Payment either in cash or in Common Stock, at its election.
If the Company elects to pay a Coupon Make-Whole Payment in Common Stock, such stock will be valued at 90% of the simple average of the daily VWAP of the Common Stock for the 10 Trading Days ending on and including the Trading Day immediately
preceding the Conversion Date and should be calculated by the Company. The calculation of the simple average of the daily volume weighted average price shall be subject to appropriate adjustment pursuant to Section 5.04. 

(c) Not withstanding anything in the Indenture to the contrary, the Company shall have thirty (30) days from the Conversion Date to
pay the Coupon Make-Whole Payment. 
 (d) If the Conversion Date falls after the Close of Business on a Regular Record Date for
an Interest Payment Date and on or prior to the corresponding Interest Payment Date, the amount of the Coupon Make-Whole Payment will be reduced by the amount of interest payable on such Interest Payment Date to the Holder of record of the converted
Notes on the Close of Business on the corresponding Regular Record Date. 
 Section 5.08. Taxes on Shares Issued.
Any issue of share certificates on conversion of any Notes shall be made without charge to the converting Holder for any documentary, transfer, stamp or any similar tax in respect of the issue thereof, and the Company shall pay any and all
documentary, stamp or similar issue or transfer taxes that may be payable in respect of the issue or delivery of shares of Common Stock on conversion of Notes pursuant hereto. The Company shall not, however, be required to pay any such tax which may
be payable in respect of any transfer involved in the issue and delivery of shares in any name other than that of the Holder of any Notes converted, and the Company shall not be required to issue or deliver any such share certificate unless and
until the Person or Persons requesting the issue thereof shall have paid to the Company the amount of such tax or shall have established to the satisfaction of the Company that such tax has been paid. 

Section 5.09. Reservation of Shares; Shares to be Fully Paid; Compliance with Governmental Requirements. The Company shall
provide, free from preemptive rights, out of its authorized but unissued shares or shares held in treasury, sufficient Common Stock to provide for the conversion of the Notes from time to time as such Notes are presented for conversion. 

  
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 The Company covenants that all shares of Common Stock that may be issued upon conversion of
Notes shall be newly issued shares or treasury shares, shall be duly authorized, validly issued, fully paid and non-assessable and shall be free from preemptive rights and free from any lien or adverse claim. 

The Company shall use its reasonable efforts to list or cause to have quoted any shares of Common Stock to be issued upon conversion of
Notes on each national securities exchange or over-the-counter or other domestic market on which the Common Stock is then listed or quoted; and the Company shall use its reasonable efforts to list or cause to have quoted any shares of Common Stock
issued in connection with any Coupon Make-Whole Payment on each national securities exchange or over-the-counter or other domestic market on which the Common Stock is then listed or quoted. 

Section 5.10. 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 whether any facts exist which may require any adjustment 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 Common Stock, or of any securities or property, which may at any time be issued or delivered upon the conversion of any Notes; 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 Common Stock or share certificates or other securities or property or cash upon the surrender of any Notes for the purpose of conversion
or to comply with any of the duties, responsibilities or covenants of the Company contained in this Article 5. 

Section 5.11. Stockholder Rights Plan. To the extent that the Company has a stockholder rights plan in effect upon conversion
of the Notes into Common Stock, Holders of Notes will receive, in addition to Common Stock, the rights under the stockholder rights plan, unless prior to any conversion, the rights have separated from the Common Stock, in which case the Conversion
Rate will be adjusted at the time of separation as if the Company distributed to all holders of the Common Stock, shares of its Capital Stock, evidences of indebtedness or assets as described in clause Section 5.04(c) above, subject to
readjustment in the event of the expiration, termination or redemption of such rights. Any distribution of rights or warrants pursuant to a rights plan that would allow Holders to receive upon conversion, in addition to any shares of Common Stock,
the right or warrants described therein with respect to such Common Stock (unless such rights or warrants have separated from the Common Stock) shall not constitute a distribution of rights or warrants that would entitle Holders to an adjustment of
the Conversion Rate. 
 Section 5.12. Company Determination Final. Any determination that the Company or its Board
of Directors 

  
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must make pursuant to this Article 5 shall be conclusive if made in good faith, absent manifest error. Whenever the Conversion Rate is adjusted as herein provided, the Company shall promptly file
with the Trustee and any Conversion Agent an Officers’ Certificate setting forth the Conversion Rate after such adjustment and setting forth a brief statement of the facts requiring such adjustment. Unless and until a Responsible Officer of the
Trustee shall have received such Officers’ 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. 
 Redemption 
 Section 6.01. Right to Redeem; Notices to Trustee. 
 (a) Pursuant to
Section 3.01 of the Base Indenture, the Notes are redeemable on the terms and subject to the conditions set forth in this Article 6. 
 (b) Sections 3.02, 3.03, 3.04, 3.05 and 3.06 of the Base Indenture shall not apply to the Notes. No sinking fund is provided for the Notes and the Notes will not be subject to defeasance. 

(c) The Company will not redeem any notes at the Company’s option if the principal amount of the notes has been accelerated and the
acceleration has not been rescinded on or before the Redemption Date. 
 Section 6.02. Optional Redemption. Except
for any Provisional Redemption as set forth under Section 6.03, the Company may not redeem the Notes prior to July 1, 2017. The Company shall have the right, at the Company’s option, at any time, and from time to time, on a Redemption
Date on or after July 1, 2017, to redeem (a “Optional Redemption”) all or any part of the Notes at a price payable in cash equal to the Redemption Price (as defined below). 

Section 6.03. Provisional Redemption. The Company shall have the right, at the Company’s option, at any time, and from
time to time, on a Redemption Date beginning July 1, 2015 but prior to July 1, 2017, to redeem (a “Provisional Redemption”) all or any part of the Notes at a price payable in cash equal to the Redemption Price, provided
that the Last Reported Sale Price of the Common Stock for 20 or more Trading Days in a period of 30 consecutive Trading Days ending on the Trading Day immediately prior to the date of the Redemption Notice (as defined below) exceeds 150% of the
applicable Conversion Price in effect on each such Trading Day. 
 Section 6.04. Redemption Price. The redemption
price (the “Redemption Price”) at which the Notes are redeemable shall be equal to the sum of (i) 100% of the principal amount of the Notes to be redeemed, plus (ii)

  
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accrued and unpaid interest, if any, to, but excluding, the Redemption Date, provided, however, that if the Redemption Date is after a Regular Record Date and prior to the Interest Payment
Date to which it relates, then the accrued and unpaid interest, if any, to, but excluding, the Redemption Date, shall be paid on such Interest Payment Date to the Holders of record of such Notes on the applicable Regular Record Date instead of the
Holders surrendering such Notes for redemption on the Redemption Date. 
 Section 6.05. Selection of Notes to be
Redeemed. If less than all the Notes are to be redeemed, the Trustee will select the Notes to be redeemed by lot or by any other method the Trustee considers fair and appropriate in accordance with applicable procedures (so long as such method
is not prohibited by the rules of the NASDAQ Global Market or the NASDAQ Global Select Market or any other stock exchange on which the Notes are then listed, as applicable). The Trustee shall make the selection within seven (7) days from its
receipt of the notice from the Company delivered pursuant to Section 6.06 from outstanding Notes not previously called for redemption. 
 Notes and portions of Notes the Trustee selects shall be in principal amounts of $1,000 or integral multiples of $1,000. Provisions of the Indenture that apply to Notes called for redemption in whole also
apply to Notes called for redemption in part. The Trustee shall notify the Company promptly of the Notes or portions of Notes to be redeemed. 
 If any Note selected for partial redemption is converted in part before termination of the conversion right with respect to the portion of the Note so selected, the converted portion of such Note shall be
deemed (so far as may be) to be the portion selected for redemption. Notes which have been converted during a selection of Notes to be redeemed may be treated by the Trustee as outstanding for the purpose of such selection. 

Section 6.06. Redemption Notice. At least 30 days but not more than 60 days before a Redemption Date, the Company shall send
a written notice of redemption (“Redemption Notice”) by electronic transmission or by first-class mail, postage prepaid, to the Trustee, the Paying Agent and each Holder of Notes to be redeemed. 

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

(a) the Redemption Date; 
 (b) the Redemption Price; 
 (c) the applicable Conversion Rate; 

(d) the name and address of the Paying Agent and Conversion Agent; 

  
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 (e) that Notes called for redemption may be converted at any time before the Close of
Business on the Trading Day immediately preceding the Redemption Date unless the Company fails to pay the Redemption Price; 

(f) that Holders who want to convert Notes must satisfy the requirements set forth therein and in the Indenture; 

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

 (h) if fewer than all the outstanding Notes are to be redeemed, the certificate numbers (if such Notes are held other than in
global form) and principal amounts of the particular Notes to be redeemed; 
 (i) that, unless the Company defaults in making
payment of such Redemption Price, interest will cease to accrue on and after the Redemption Date; and 
 (j) the CUSIP number of
the Notes. 
 At the Company’s written request delivered at least 10 days prior to the date such notice is to be given to
the Holders, the Trustee shall give the Redemption Notice to each Holder of Notes to be redeemed in the Company’s name and at the Company’s expense. 
 Section 6.07. Effect of Redemption Notice. Once a Redemption Notice is given, Notes called for redemption become due and payable on the Redemption Date and at the Redemption Price stated in
the notice except for Notes that are converted in accordance with the terms of the Indenture. Upon surrender to the Paying Agent, such Notes shall be paid at the Redemption Price stated in the notice. 

Section 6.08. Deposit of Redemption Price. Prior to 10:00 a.m. (New York City time) on the Redemption Date, the Company shall
deposit with the Trustee or with the Paying Agent (or, if the Company or a Significant Subsidiary of the Company or an Affiliate of either of them is acting as the Paying Agent, shall segregate and hold in trust as provided in Section 4.03(b)
of the Base Indenture) an amount of money (in immediately available funds if deposited on such Trading Day) sufficient to pay the aggregate Redemption Price of all the Notes or portions thereof which are to be redeemed as of the Redemption Date.

 If the Paying Agent holds money sufficient to pay the Redemption Price with respect to the Notes to be redeemed on the
Redemption Date in accordance with the terms of the Indenture, then, immediately on and after the Redemption Date, the Notes will cease to be outstanding and interest on such Notes shall cease to accrue, whether or not the Notes are delivered to the
Paying Agent, and all other rights of the Holders of such Notes shall terminate, other than the right to receive the Redemption Price upon delivery of such Notes. 

  
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 Section 6.09. Notes Redeemed in Part. Any Note which is to be redeemed only in
part shall be surrendered at the office of the Paying Agent (with, if the Company so requires, due endorsement by, or a written instrument of transfer in form satisfactory to the Company duly executed by, the Holder thereof or such Holder’s
attorney duly authorized in writing) and the Company shall execute and the Trustee shall authenticate and deliver to the Holder of such Note, without service charge, a new Note or Notes, of any authorized denomination as requested by such Holder in
aggregate principal amount equal to, and in exchange for, the portion of the principal amount of the Note so surrendered that is not redeemed; provided, that the Company shall not be required to (i) issue, register the transfer of or
exchange any Notes during a period beginning at the Open of Business 15 days before any selection for redemption of Notes and ending at the Close of Business on the earliest date on which the relevant Redemption Notice is deemed to have been given
to all Holders of Notes to be redeemed or (ii) register the transfer of or exchange any Notes so selected for redemption, in whole or in part, except the unredeemed portion of any Notes being redeemed in part. 

Events of Default and Remedies 
 Section 7.01. Events of Default. 
 (a) The provisions of this Article
7 shall, with respect to the Notes, supersede in its entirety Article 6 of the Base Indenture. 
 (b) “Event of
Default”, wherever used herein, means any one of the following events (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): 
 (i) default by the Company
in the payment of any interest upon any Note when it becomes due and payable, and continuance of such default for a period of 30 days; or 
 (ii) default by the Company in the payment of the principal of any Note when due and payable at its Stated Maturity, upon required repurchase, upon redemption, upon acceleration or otherwise; or

 (iii) failure by the Company to comply with its conversion obligation upon exercise of a Holder’s conversion right and
such failure continues for five days; or; 
 (iv) failure by the Company to comply with its obligations under Article 8; or

  
 40 

 (v) failure by the Company to issue a Fundamental Change Notice in accordance with
Section 4.01; or 
 (vi) failure by the Company for 50 days after written notice from the Trustee, at the direction of the
Holders, or the Holders of at least 25% principal amount of the Outstanding Notes has been received by the Company to comply with any of its other agreements contained in the Notes or the Indenture; or 

(vii) default under any agreements, indentures or instruments under which the Company or any Significant Subsidiary then has
outstanding, or by which there may be secured or evidenced, any indebtedness for money borrowed having a principal amount in excess of $5,000,000 in the aggregate of the Company and/or any such Significant Subsidiary of the Company, whether such
indebtedness now exists or shall hereafter be created, and such default results in such indebtedness being accelerated or otherwise becoming due and owing prior to its scheduled maturity or such default constitutes a failure to pay at least
$5,000,000 of such indebtedness when due and payable (after the expiration of any applicable grace period) at its stated maturity, upon required repurchase, upon declaration or otherwise; provided that any such Event of Default shall be
deemed cured and not continuing upon payment of such indebtedness or rescission of such declaration; or 
 (viii) one or more
judgments, orders or decrees for the payment of money in excess of $5,000,000, either individually or in the aggregate, shall be entered against the Company or any of its Significant Subsidiaries and shall not be discharged, bonded, paid, stayed,
waived, subject to a negotiated settlement or subject to insurance within 60 days after (A) the date on which the right to appeal thereof has expired if no such appeal has commenced, or (B) the date on which all rights to appeal have been
extinguished; or 
 (ix) the Company or any of its Significant Subsidiaries shall commence a voluntary case or other proceeding
seeking liquidation, reorganization or other relief with respect to itself 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 of its Significant Subsidiaries or any substantial part of its respective property, or shall consent to any such relief or to the appointment of or taking possession by any such official in an involuntary
case or other proceeding commenced against it, or shall make a general assignment for the benefit of creditors, or shall fail generally to pay its debts as they become due; or 

(x) an involuntary case or other proceeding shall be commenced against the Company or any of its Significant Subsidiaries seeking
liquidation, reorganization or other relief with respect to it 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 of its Significant Subsidiaries or any substantial part of its respective property, and such involuntary case or other proceeding shall remain undismissed and unstayed for a period of sixty (60) consecutive days.

  
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 Section 7.02. Acceleration of Maturity; Rescission and Annulment. 

(a) If an Event of Default occurs and is continuing, then and in every such case except as provided below, the Trustee by notice to the
Company, at the direction of the Holders, or the Holders of not less than 25% in principal amount of the Outstanding Notes by notice to the Company and the Trustee may, and the Trustee at the request of such holders shall, declare the principal of
all the Outstanding Notes and accrued and unpaid interest, if any, to be due and payable immediately, and upon any such declaration such principal and accrued and unpaid interest, if any, shall become immediately due and payable. However, upon an
Event of Default arising out of Section 7.01(b)(ix) or Section 7.01(b)(x) (except in each case with respect to any Significant Subsidiary) the principal amount of all the Outstanding Notes, plus accrued and unpaid interest to the
acceleration date, if any, shall be due and payable immediately without notice from the Trustee or Holders. 
 (b)
Notwithstanding the foregoing, at the election of the Company, the sole remedy with respect to an Event of Default for the failure by the Company to comply with its covenants set forth in Section 3.05 (any such Event of Default, a
“Reporting Default”), will for the first 365 days after the occurrence of such Reporting Default, consist exclusively of the right to receive additional interest (the “Additional Interest”) on the Notes at an annual
rate equal to 0.50% of the principal amount of the Notes. The Additional Interest will be payable in the same manner and on the same dates as the stated interest payable on the Notes. The Additional Interest shall accrue on all Outstanding Notes
from and including the date on which such Reporting Default first occurs until, but excluding, the 365th day thereafter (or such earlier date on which such Reporting Default is cured or waived). On the 365th day after such Reporting Default (if such
violation is not cured or waived prior to such 365th day), such Additional Interest will cease to accrue and the Trustee or the Holders of not less than 25% in principal amount of the Outstanding Notes may declare the principal of and accrued and
unpaid interest on all such Notes to be due and payable immediately. If the Company does not elect to pay Additional Interest during the continuance of such an Event of Default, in accordance with this paragraph, the Trustee or the Holders of not
less than 25% in principal amount of the Outstanding Notes may declare the principal of and accrued and unpaid interest on all such Notes to be due and payable immediately. 
 (c) If the Company elects to pay the Additional Interest as the sole remedy for the Reporting Default, the Company shall notify in writing the Holders, the Paying Agent and the Trustee of such election at
any time on or before the Close of Business on the date on which such Event of Default first occurs. If the Company fails to give such notice, the Trustee or the Holders of not less than 25% in principal amount of the Outstanding Notes may declare
the principal of and accrued and unpaid interest (including Additional Interest, if any) on such Notes to be due and payable immediately. The Company shall pay the Additional Interest semi-annually in arrears, with the first semi-annual payment due
on the first Interest Payment Date following the date of such Reporting Default, in the same manner as described on the face of the Note. 

  
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 Section 7.03. Collection of Indebtedness and Suits for Enforcement by Trustee.

 The Company covenants that if 
 (a) default is made in the payment of any interest on any Note when such interest becomes due and payable and such default continues for a period of 30 days, or 

(b) default is made in the payment of the principal of any Note at the Stated Maturity thereof, 

the Company will pay for the benefit of the Holders of such Notes, the whole amount then due and payable on such Notes for principal and interest, and,
to the extent that payment of such interest shall be legally enforceable, interest on any overdue principal and on any overdue interest, at the rate borne by the Notes, and, in addition thereto, such further amount as shall be sufficient to cover
the costs and expenses of collection, including the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and counsel. 
 If an Event of Default occurs and is continuing, the Trustee may in its discretion proceed to protect and enforce its rights and the rights of the Holders by such appropriate judicial proceedings as to
protect and enforce any such rights, whether for the specific enforcement of any covenant or agreement in the Indenture or in aid of the exercise of any power granted herein, or to enforce any other proper remedy. 

Section 7.04. Trustee May File Proofs of Claim. 
 In case of any judicial proceeding relative to the Company (or any other obligor upon the Notes), its property or its creditors, the Trustee shall be entitled and empowered, by intervention in such
proceeding or otherwise, to take any and all actions authorized under the Trust Indenture Act in order to have claims of the Holders and the Trustee allowed in any such proceeding. In particular, the Trustee shall be authorized to collect and
receive any moneys or other property payable or deliverable on any such claims and to distribute the same; and any custodian, receiver, assignee, trustee, liquidator, sequestrator or other similar official in any such judicial proceeding is hereby
authorized by each Holder to make such payments to the Trustee and, in the event that the Trustee shall consent to the making of such payments directly to the Holders, to pay to the Trustee any amount due it for the reasonable compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel, and any other amounts due the Trustee under Section 7.06 of the Base Indenture. 
 No provision of the Indenture shall be deemed to authorize the Trustee to authorize or consent to or accept or adopt on behalf of any Holder any plan of reorganization, arrangement, adjustment or
composition affecting the Notes 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. 

  
 43 

 Section 7.05. Trustee May Enforce Claims Without Possession of Notes.

 All rights of action and claims under the Indenture or the Notes may be prosecuted and enforced by the Trustee without the
possession of any of the Notes or the production thereof in any proceeding relating thereto, and any such proceeding instituted by the Trustee shall be brought as trustee of an express trust, and any recovery of judgment shall, after provision for
the payment of the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and counsel, be for the ratable benefit of the Holders of the Notes in respect of which such judgment has been recovered. 

Section 7.06. Application of Money Collected. 
 Any money or property money collected by the Trustee pursuant to this Article shall be applied in the following order, at the date or dates fixed by the Trustee and, in case of the distribution of such
money on account of principal or interest, upon presentation of the Notes and the notation thereon of 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 of the Base Indenture; 

SECOND: To the payment of the amounts then due and unpaid for principal of and interest on the Notes in respect of which or for the
benefit of which such money has been collected, ratably, without preference or priority of any kind, according to the amounts due and payable on such Notes for principal and interest, respectively; and 

THIRD: The balance, if any, to the Company or any other Person or Persons entitled thereto. 

Section 7.07. Limitation on Suits. 
 Subject to Section 7.08, no Holder of any Note shall have any right to institute any proceeding, judicial or otherwise, with respect to the Indenture, or for the appointment of a receiver or trustee,
or for any other remedy hereunder, unless 
 (a) such Holder has previously given written notice to the Trustee of a continuing
Event of Default; 
 (b) the Holders of not less than 25% in principal amount of the Outstanding Notes shall have made written
request to the Trustee to institute proceedings in respect of such Event of Default as Trustee hereunder; 

  
 44 

 (c) such Holder or Holders have offered in writing to the Trustee security or indemnity
satisfactory to it against any loss, expenses and liabilities to be incurred in compliance with such request; 
 (d) the Trustee
for 60 days after its receipt of such notice, request and offer of indemnity has failed to institute any such proceeding; and 

(e) no direction that, in the opinion of the Trustee, is inconsistent with such written request has been given to the Trustee during such
60-day period by the Holders of a majority in principal amount of the Outstanding Notes; 
 it being understood and intended that no one or more
Holders shall have any right in any manner whatever by virtue of, or by availing of, any provision of the Indenture to affect, disturb or prejudice the rights of any other Holders, or to obtain or to seek to obtain priority or preference over any
other Holders or to enforce any right under the Indenture, except in the manner herein provided and for the equal and ratable benefit of all the Holders. 
 Section 7.08. Unconditional Right of Holders to Receive Principal and Interest and to Convert. 
 Notwithstanding any other provision in the Indenture, the Holder of any Note shall have the right, which is absolute and unconditional, to receive payment of the principal of and interest, (including any
Additional Interest), on such Note expressed in such Note and to convert such Note in accordance with Article 5 and to institute suit for the enforcement of any such payment and right to convert, and such rights shall not be impaired without the
consent of such Holder. 
 Section 7.09. Restoration of Rights and Remedies. 

If the Trustee or any Holder has instituted any proceeding to enforce any right or remedy under the Indenture and such proceeding has
been discontinued or abandoned for any reason, or has been determined adversely to the Trustee or to such Holder, then and in every such case, subject to any determination in such proceeding, the Company, the Trustee and the Holders shall be
restored severally and respectively to their former positions hereunder and thereafter all rights and remedies of the Trustee and the Holders shall continue as though no such proceeding had been instituted. 

Section 7.10. Rights and Remedies Cumulative. 
 Except as otherwise provided with respect to the replacement or payment of mutilated, destroyed, lost or stolen Notes in Section 2.07 of the Base Indenture, no right or remedy herein conferred upon
or reserved to the Trustee or to the Holders is intended to be exclusive of any other right or remedy, and every right and remedy shall, to the extent permitted by law, be 

  
 45 

 
cumulative and in addition to every other right and remedy given hereunder or now or hereafter existing at law or in equity or otherwise. The assertion or employment of any right or remedy
hereunder, or otherwise, shall not prevent the concurrent assertion or employment of any other appropriate right or remedy. 

Section 7.11. Delay or Omission Not Waiver. 
 No delay or omission of the Trustee or of any Holder of any Note to exercise any right or remedy accruing upon any Event of Default shall impair any such right or remedy or constitute a waiver of any such
Event of Default or an acquiescence therein. Every right and remedy given by this Article or by law to the Trustee or to the Holders may be exercised from time to time, and as often as may be deemed expedient, by the Trustee (subject to the
limitations contained in the Indenture) or by the Holders, as the case may be. 
 Section 7.12. Control by Holders.

 The Holders of a majority in principal amount of the Outstanding Notes 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, provided that 
 (a) such direction shall not be in conflict with any rule of law or with the Indenture, and 
 (b) the Trustee may take any other action deemed proper by the Trustee which is not inconsistent with such direction or the Indenture. 

The Trustee shall have the right to decline to follow any such direction if the Trustee in good faith shall, by a Responsible Officer or
officers of the Trustee or upon the advice of legal counsel, determine that the proceeding so directed, subject to the Trustee’s duties under the Trust Indenture Act, would involve the Trustee in personal liability or might be unduly
prejudicial to the Holders not involved in the proceeding. 
 Section 7.13. Waiver of Past Defaults and Rescission.

 The Holders of not less than a majority in aggregate principal amount of the Outstanding Notes may, by written notice to the
Company and the Trustee, on behalf of the Holders of all the Notes: 
 (a) waive any past default or Event of Default hereunder
and its consequences, except a default 

  
 46 

 (i) in the payment of the principal of, accrued and unpaid interest (including any
Additional Interest) on any Note that remains uncured, 
 (ii) in respect of the failure to deliver the consideration due upon
conversion of a Note in accordance with Section 5.01 hereunder, 
 (iii) in the payment of any applicable Redemption
Price, or 
 (iv) in the payment of any applicable Fundamental Change Repurchase Price or any applicable Option Purchase Price.

 (b) at any time after a declaration of acceleration has been made, rescind and annul any such declaration of acceleration
with respect to the Notes and its consequences, if: 
 (i) such rescission will not conflict with any judgment or decree of a
court of competent jurisdiction; and 
 (ii) such declaration is not the result of a failure to deliver consideration due upon
conversion, a payment default arising from the Company’s failure to repurchase any Notes when required, a payment default arising from the Company’s failure to pay the Redemption Price on the Redemption Date in connection with the Company
exercising its redemption rights. 
 Upon any such waiver, such default shall cease to exist, and any Event of Default arising
therefrom shall be deemed to have been cured, for every purpose of the Indenture; but no such waiver shall extend to any subsequent or other default or impair any right consequent thereon. 

Section 7.14. Undertaking for Costs. 
 In any suit for the enforcement of any right or remedy under the Indenture, or in any suit against the Trustee for any action taken, suffered or omitted by it as Trustee, a court may require any party
litigant in such suit to file an undertaking to pay the costs of such suit, and may assess costs against any such party litigant, in the manner and to the extent provided in the Trust Indenture Act; provided, that neither this Section nor the
Trust Indenture Act shall be deemed to authorize any court to require such an undertaking or to make such an assessment in any suit instituted by the Company or in any suit for the enforcement of the right to convert any Note in accordance with
Article 5. 
 Section 7.15. Waiver of Stay or Extension Laws. 

The Company covenants (to the extent that it may lawfully do so) that it will not at any time insist upon, or plead, or in any manner
whatsoever claim or take the benefit or advantage of, any usury, stay or extension law wherever enacted, now or at any time hereafter in force, which 

  
 47 

 
may affect the covenants or the performance of the Indenture; and the Company (to the extent that it may lawfully do so) hereby expressly waives all benefit or advantage of any such law and
covenants that it will not 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 7.16. Notice of Default. 
 (a) The provisions of this Section 7.16 shall, with respect to the Notes, supersede in its entirety Section 7.14 of the Base Indenture. 

(b) If a default or Event of Default occurs and is continuing and a Responsible Officer of the Trustee has actual knowledge of such
default, the Trustee must send to each Holder notice of the default or Event of Default within 90 days after it occurs or, if later, promptly after the Trustee obtains actual knowledge thereof. Except in the case of a default in the payment of
principal of or interest on any Note, the Trustee may withhold notice if and so long as the Trustee in good faith or in reliance on the advice of legal counsel, determines that withholding notice is in the interests of the Holders. In addition, the
Company shall deliver to the Trustee, within 120 days after the end of each fiscal year, a certificate indicating whether the signers thereof know of any default or Event of Default that occurred during the previous year. The Company shall also
deliver to the Trustee, within 30 days after the occurrence thereof, written notice of any events which would constitute certain defaults, their status and what action the Company is taking or propose to take in respect thereof. 

Consolidation, Merger, Conveyance, Transfer or Lease 
 Section 8.01. Company May Consolidate, Etc., Only on Certain Terms. 

(a) This Section 8.01 shall, with respect to the Notes, supersede in its entirety Section 10.01 of the Base Indenture. The
Company shall not consolidate with or merge with or into any other Person or sell, convey, transfer or lease all or substantially all of its properties and assets to another Person, unless: 

(i) either (A) the Company is the surviving corporation or (b) the resulting, surviving or transferee Person (if other than
the Company) is a corporation organized and existing under the laws of the United States of America, any State thereof or the District of Columbia, and such Person expressly assumes by supplemental indenture all of the Company’s obligations
under the Notes and the Indenture; 
 (ii) immediately after giving effect to such transaction, no default or Event of Default
shall have occurred and be continuing; and 

  
 48 

 (iii) the Company, or the successor Person if other than the Company, has delivered to the
Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that such consolidation, merger, conveyance, transfer or lease and, if a supplemental indenture is required in connection with such transaction, such supplemental
indenture comply with this Article and that all conditions precedent herein provided for relating to such transaction have been complied with and such supplemental indenture is the legal, valid and binding obligation of the Company enforceable
against it in accordance with its terms, subject to customary exceptions. 
 Section 8.02. Successor Substituted.

 Upon any consolidation of the Company with, or merger of the Company into, any other Person or any conveyance, transfer or
lease of the properties and assets of the Company substantially as an entirety in accordance with Section 8.01, the successor Person formed by such consolidation or into which the Company is merged or to which such conveyance, transfer or lease
is made shall succeed to, and may exercise, every right and power of the Company under the Indenture with the same effect as if such successor Person had been named as the Company herein, and thereafter, the predecessor Person shall be relieved of
all obligations and covenants under the Indenture and the Notes. If the Company is still in existence after the transaction, it will be released from its obligations and covenants hereunder and the under the Notes. 

Satisfaction and Discharge 
 Section 9.01. Satisfaction and Discharge of Indenture. 
 (a) Subject
to Section 1.02 hereof, the provisions of Article 11 of the Base Indenture, as supplemented by the provisions of this Supplemental Indenture, shall apply to the Notes. 
 (b) Section 11.01 and 11.02 of the Base Indenture shall not apply to the Notes. 
 (c) When (i) the Company shall deliver to the Trustee for cancellation all Notes theretofore authenticated (other than any Notes that have been destroyed, lost or stolen and in lieu of or in
substitution for which other Notes shall have been authenticated and delivered) and not theretofore canceled, or (ii) all the Notes not theretofore canceled or delivered to the Trustee for cancellation shall have become due and payable, and the
Company shall deposit with the Trustee, in trust, cash and/or shares of Common Stock sufficient to pay at Stated Maturity, upon conversion (assuming the maximum number of Additional Shares then issuable), upon any date on which a Coupon Make-Whole
Payment is to be paid, upon any Redemption Date, upon any Option Purchase Date or upon any Fundamental Change Repurchase Date all principal and interest (including Additional Interest, if any) due or to become due to such Stated Maturity, Redemption
Date, date on which a Coupon Make-Whole Payment is to be paid, Option Purchase 

  
 49 

 
Date or Fundamental Change Repurchase Date, as the case may be, and if the Company shall also pay or cause to be paid all other sums payable hereunder by the Company, then the Indenture shall
cease to be of further effect (except as to (A) remaining rights of registration of transfer, substitution and exchange and conversion of Notes, (B) rights hereunder of Holders to receive payments of principal of and interest (including
Additional Interest, if any) on, the Notes and the other rights, duties and obligations of Holders, as beneficiaries hereof with respect to the amounts, if any, so deposited with the Trustee and (C) the rights, obligations and immunities of the
Trustee hereunder) and the Trustee, on written demand of the Company accompanied by an Officers’ Certificate and an Opinion of Counsel and at the reasonable cost and expense of the Company, shall execute proper instruments acknowledging
satisfaction of and discharging the Indenture; the Company, however, hereby agrees to reimburse the Trustee for any costs or expenses thereafter incurred by the Trustee and to compensate the Trustee for any services thereafter rendered by the
Trustee in connection with the Indenture or the Notes. 
 Supplemental Indentures 

Section 10.01. Supplemental Indentures. Subject to Section 1.02 hereof, the provisions of Article 9 of the Base
Indenture, as supplemented by the provisions of this Supplemental Indenture, shall apply to the Notes. 
 It shall not be
necessary for any Act of Holders under this Article 10 to approve the particular form of any proposed supplemental indenture, but it shall be sufficient if such Act shall approve the substance thereof. 

Any Notes held by the Company or any of its Affiliates shall be disregarded (from both the numerator and the denominator) for purposes of
determining whether the Holders of the requisite aggregate principal amount of the Outstanding Notes have consented to a modification, amendment or waiver of the terms of the Indenture. 

Section 10.02. Supplemental Indentures Without Consent of Holders. In addition to any permitted amendment or supplement to
the Indenture pursuant to Section 9.01 of the Base Indenture, without the consent of any Holders, the Company, when authorized by a Board Resolution, and the Trustee, at any time and from time to time, may enter into one or more indentures
supplemental hereto, in form reasonably satisfactory to the Company, for any of the following purposes: 
 (a) to cure any
ambiguity, manifest error, defect or omission or inconsistency that does not adversely affect the Holders in any material respect; 
 (b) to provide for the assumption of the Company’s obligations under the Indenture by a successor upon any merger, consolidation or asset transfer permitted under the Indenture and to provide for
conversion of the Notes into Reference Property; 

  
 50 

 (c) to provide any security for or add guarantees with respect to the Notes; 

(d) to comply with any requirement of the SEC in connection with the qualification of the Indenture under the Trust Indenture Act;

 (e) to add covenants that would benefit the Holders or to surrender any rights the Company has under the Indenture

 (f) to provide for a successor Trustee in accordance with the terms of the Indenture or to otherwise comply with any
requirement of the Indenture 
 (g) to provide for the issuance of Additional Notes, to the extent that the Company deems such
amendment necessary or advisable in connection with such issuance; provided that no such amendment or supplement may impair the rights or interests of any Holder; 
 (h) to increase the Conversion Rate; 
 (i) to add Events of Default with respect
to the Notes; 
 (j) to add circumstances under which the Company will pay additional interest on the Notes; 

(k) to make any other change that does not adversely affect the rights of any Holder of Outstanding Notes; or 

(l) to conform the terms of the Indenture or the Notes to the “Description of notes” section of the Company’s final
prospectus supplement dated July 29, 2012 relating to the offering of the Notes, which shall be evidenced by an Officer’s Certificate of the Company to that effect. 
 Section 10.03. Supplemental Indentures with Consent of Holders. 
 In
addition to any permitted amendment or supplement to the Indenture pursuant to Section 9.02 of the Base Indenture, with the consent of the Holders of not less than a majority in principal amount of the Outstanding Notes, by Act of said Holders
delivered to the Company and the Trustee, the Company, when authorized by a Board Resolution, and the Trustee may enter into an indenture or indentures supplemental hereto for the purpose of adding any provisions to or changing in any manner or
eliminating any of the provisions of the Indenture or of modifying in any manner the rights of the Holders under the Indenture; provided, however, that no such supplemental indenture shall, without the consent of the Holder of each
Outstanding Note affected thereby, 

  
 51 

 (a) make any change in the percentage of principal amount of Notes whose Holders must
consent to an amendment, supplement or waiver or to make any change in this provision for modification; 
 (b) reduce any rate
of interest or extend the time for payment of interest on the Notes; 
 (c) reduce the principal amount of, or the Fundamental
Change Repurchase Price, Option Purchase Price or Redemption Price with respect to, the Notes, or change their final Stated Maturity; 
 (d) make payments on the Notes payable in currency other than as originally stated in the Notes; 
 (e) impair the Holder’s right to institute suit for the enforcement of any payment on the Notes; 
 (f) adversely affect the ranking of the Notes as senior unsecured indebtedness of the Company; 
 (g) waive a continuing default or Event of Default regarding any payment on the Notes; 
 (h) adversely affect the right of any Holder to require the Company to repurchase all or any of its Notes as provided in Article 4 ; or 

(i) adversely affect the right of any Holder to convert any Note as provided in Article 5. 

Section 10.04. Notices of Supplemental Indentures. After a supplement under this Article 10 becomes effective, the Company
will send to the Holders a notice briefly describing the amendment, supplement or waiver. The Company will send supplemental indentures to Holders upon request. Any failure of the Company to send such notice, or any defect therein, will not,
however, in any way impair or affect the validity of any such supplemental indenture or waiver. 
 Miscellaneous 

Section 11.01. Governing Law. THIS SUPPLEMENTAL INDENTURE AND THE NOTES SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF NEW YORK (WITHOUT GIVING EFFECT TO THE CONFLICT OF LAWS PRINCIPLES THEREOF). 

  
 52 

 Section 11.02. Calculations in Respect of Notes. 

Except as otherwise provided in the Indenture, the Company shall be responsible for making all calculations called for hereunder and
under the Notes or in connection with a conversion. These calculations include, but are not limited to, determinations of the Last Reported Sales Price, accrued interest payable on the Notes and the Conversion Rate on the Notes. The Company shall
make all these calculations in good faith and, absent manifest error, the Company’s calculations will be final and binding on the Holders. The Company shall provide a schedule of the Company’s calculations to each of the Trustee and the
Conversion Agent, and each of the Trustee and the Conversion Agent is entitled to rely conclusively upon the accuracy of the Company’s calculations without independent verification. The Trustee will forward its calculations to any Holder upon
the request of such Holder. 
 Section 11.03. Confirmation of Indenture. The Base Indenture, as supplemented and
amended by this Supplemental Indenture and all other indentures supplemental thereto, is in all respects ratified and confirmed, and the Base Indenture, this Supplemental Indenture and all indentures supplemental thereto shall be read, taken and
construed as one and the same instrument. 
 Section 11.04. Counterparts. The parties hereto may sign one or more
copies of this Supplemental Indenture in counterparts, all of which together shall constitute one and the same agreement. 

[Remainder of Page Intentionally Blank; Signature Page Follows] 

  
 53 

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

			
	GEVO, INC.
		
	By:	 	 /s/ Mark Smith

		
		 	     Name: Mark Smith
		 	     Title: Chief Financial Officer
	
	WELLS FARGO BANK, NATIONAL ASSOCIATION
	As Trustee
		
	By:	 	 /s/ Michael Tu

		
		 	     Name: Michael Tu
		 	     Title: Assistant Vice President

 [SIGNATURE PAGE TO THE FIRST SUPPLEMENTAL INDENTURE] 

 Schedule A 

Make-Whole Table 
  

																																																													
	 Make-Whole
Reference Date
	 	Stock Price	 
	 	$4.95	 	 	$5.50	 	 	$6.00	 	 	$7.00	 	 	$8.00	 	 	$9.00	 	 	$10.00	 	 	$11.00	 	 	$12.00	 	 	$13.00	 	 	$14.00	 	 	$15.00	 	 	$16.00	 	 	$18.00	 	 	$20.00	 
																
	 July 5, 2012
	 	 	26.3505	  	 	 	26.3505	  	 	 	26.2426	  	 	 	18.9389	  	 	 	14.1113	  	 	 	10.7466	  	 	 	8.3001	  	 	 	6.4612	  	 	 	5.0435	  	 	 	3.9297	  	 	 	3.0430	  	 	 	2.3314	  	 	 	1.7576	  	 	 	0.9210	  	 	 	0.3793	  
																
	 July 1, 2013
	 	 	26.3505	  	 	 	26.3505	  	 	 	23.1694	  	 	 	16.0302	  	 	 	11.5563	  	 	 	8.5935	  	 	 	6.5306	  	 	 	5.0302	  	 	 	3.8989	  	 	 	3.0216	  	 	 	2.3276	  	 	 	1.7715	  	 	 	1.3225	  	 	 	0.6641	  	 	 	0.2334	  
																
	 July 1, 2014
	 	 	26.3505	  	 	 	24.9234	  	 	 	19.3539	  	 	 	12.0583	  	 	 	7.8906	  	 	 	5.4405	  	 	 	3.9337	  	 	 	2.9487	  	 	 	2.2594	  	 	 	1.7459	  	 	 	1.3443	  	 	 	1.0202	  	 	 	0.7536	  	 	 	0.3475	  	 	 	0.0680	  
																
	 July 1, 2015
	 	 	26.3505	  	 	 	22.1860	  	 	 	15.8854	  	 	 	7.1088	  	 	 	1.7703	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  
																
	 July 1, 2016
	 	 	26.3505	  	 	 	19.0215	  	 	 	12.8142	  	 	 	5.2141	  	 	 	1.1997	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  
																
	 July 1, 2017
	 	 	26.3505	  	 	 	6.1485	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  	 	 	0.0000	  

  
 A-1

 Exhibit A 

[FORM OF FACE OF NOTE] 
 UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (“DTC”), A NEW YORK CORPORATION, TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER,
EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS
IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. THIS NOTE IS
A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A NOMINEE THEREOF. THIS NOTE IS EXCHANGEABLE FOR NOTES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS
NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE
DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY.1 

 

	1 	 This legend is to be included only if the Note is a Global Note. 

  
 A-1

 Certificate No. 1 
 GEVO, INC. 
 7.5% Convertible Senior Notes due 2022 

U.S. $[—] 
 CUSIP: 374396 AA7 
 ISIN: US374396AA74 

Gevo, Inc., a company duly incorporated and validly existing under the laws of the State of Delaware (herein called the
“Company”), which term includes any successor corporation under the Indenture referred to on the reverse hereof), for value received hereby promises to pay to Cede & Co., or registered assigns, the principal sum of [—] United States Dollars ($[—]) (which amount may from time to time be increased or decreased by adjustments made on the records of the Trustee, as
custodian for the Depositary, in accordance with the rules and procedures of the Depositary and in accordance with the below referred Indenture) on July 1, 2022. 
 The issue date of this Note is July 5, 2012. 
 Reference is made to the
further provisions of this Note set forth on the reverse hereof, including, without limitation, provisions giving the Company the right to redeem this Note under certain circumstances, provisions giving the Holder the right to convert this Note into
Common Stock of the Company and provisions relating to the ability and obligation of the Company to purchase this Note upon certain events, in each case, on the terms and subject to the limitations referred to on the reverse hereof and as more fully
specified in the Indenture. Such further provisions shall for all purposes have the same effect as though fully set forth at this place. Capitalized terms used but not defined herein shall have such meanings as are ascribed to such terms in the
Indenture. 
 This Note shall be deemed to be a contract made under the laws of the State of New York, and for all purposes
shall be construed in accordance with and governed by the laws of said State. 
 [Signature page follows] 

  
 2 

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

 

			
	GEVO, INC.
		
	By:	 	  

		 	Name:
		 	Title:
		
	Date:	 	  

  

			
	TRUSTEE’S CERTIFICATION OF AUTHENTICATION
	
	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee, certifies that this is one of the Notes described in the within-mentioned Indenture.
		
	By:	 	  

		 	Name:
		 	Authorized Signatory
		
	Date:	 	  

  
 3 

 [FORM OF REVERSE SIDE OF NOTE] 

Gevo, Inc. 

7.5% Convertible Senior Notes due 2022 
 This Note is one of a duly authorized issue of 7.5% Convertible Senior Notes due 2022 (the “Notes”) of the Company issued under an Indenture, dated as of July 5, 2012 (the
“Base Indenture”), as amended, modified and supplemented by the First Supplemental Indenture dated as of July 5, 2012 (the “Supplemental Indenture” and, together with the Base Indenture, the
“Indenture”) between the Company and Wells Fargo Bank, National Association, as trustee (the “Trustee”). The terms of the Note include those stated in the Indenture, those made part of the Indenture by reference to
the Trust Indenture Act of 1939, as amended (the “TIA”), and those set forth in this Note. This Note is subject to all such terms, and Holders are referred to the Indenture and the TIA for a statement of all such terms. To the
extent permitted by applicable law, if any provision of this Note conflicts with the express provisions of the Indenture, the provisions of the Indenture shall govern and be controlling. Capitalized terms used but not defined herein have the
meanings assigned to them in the Indenture unless otherwise indicated. 
  

	 	1.	Interest. 

 This Note
shall bear interest at a rate of 7.5% per annum on the principal amount. Interest on this Note shall accrue from the most recent date to which interest has been paid or, if no interest has been paid, from July 5, 2012. Interest will be
payable semi-annually, in arrears, on each January 1 and July 1, beginning on January 1, 2013, to holders of record at the Close of Business on the immediately preceding December 15 and June 15, respectively. Interest will
be computed on the basis of a 360-day year comprised of twelve 30-day months. If a payment date is not a Business Day, payment will be made on the next succeeding Business Day, and no interest (including Additional Interest, if any) will accrue for
the intervening period. 
 Interest (including Additional Interest, if any) will cease to accrue on the Notes upon the Maturity
Date, their redemption by the Company or their conversion or repurchase by the Company at the option of the Holder. 
  

	 	2.	Method of Payment. 

Payment of the principal of the Notes shall be made at the Corporate Trust Office of the Trustee in such coin or currency of the United
States of America as at the time of payment is legal tender for payment of public and private debts. Payment of interest including Additional Interest, if any, on Certificated Notes shall be made by check mailed to the address of the Person entitled
thereto as such address appears in the Security Register; provided, however, that Holders with Notes in an aggregate principal amount in excess of $1.0 million shall be paid, at their written election, by wire transfer of immediately
available funds. Notwithstanding the foregoing, so long as the Notes are registered in the name of a Depositary or its nominee, all payments with respect to the Notes shall be made by wire transfer of immediately available funds to the account of
the Depositary or its nominee. 
  

	 	3.	Paying Agent, Registrar and Conversion Agent. 

 Initially, the Trustee will act as Paying Agent, Registrar and Conversion Agent. The Company or any Affiliate of the Company may act as Paying Agent, Registrar or Conversion Agent. 

 

	 	4.	Indenture. 

 The Notes are
general unsecured senior obligations of the Company. The Indenture does not limit the ability of the Company to incur other debt, secured or unsecured. 

  
 4 

	 	5.	Provisional Redemption by the Company. 

 The Notes are redeemable at any time and from time to time on or after July 1, 2015 but prior to July 1, 2017 at the option of the Company if the Last Reported Sale Price of the Common Stock for
20 or more Trading Days in a period of 30 consecutive Trading Days ending on the Trading Day immediately prior to the date of the Redemption Notice exceeds 150% of the applicable Conversion Price in effect on each such Trading Day. The Redemption
Price shall be equal to a cash amount equal to the sum of (i) 100% of the principal amount of Notes being redeemed, plus (ii) accrued and unpaid interest (including Additional Interest, if any), if any to, but excluding, the
Redemption Date. The Redemption Date must be a Business Day. 
  

	 	6.	Optional Redemption by the Company. 

 The Notes are redeemable at any time on or after July 1, 2017 at the option of the Company. The Redemption Price shall be equal to a cash amount equal to the sum of (i) 100% of the principal
amount of Notes being redeemed, plus (ii) accrued and unpaid interest (including Additional Interest, if any), if any to, but excluding, the Redemption Date. The Redemption Date must be a Business Day. 

 

	 	7.	Purchase by the Company at the Option of the Holder Upon a Fundamental Change. 

Subject to the terms and conditions of the Indenture, the Company shall become obligated to purchase, at the option of any Holder, all or
any portion of the Notes held by such Holder upon a Fundamental Change in principal amounts of $1,000 or multiples of $1,000 at the Fundamental Change Repurchase Price. To exercise such right, a Holder shall deliver to the Paying Agent, and the
Paying Agent must receive, a Fundamental Change Repurchase Notice containing the information set forth in the Indenture, at any time prior to the Close of Business on the Business Day immediately preceding the Fundamental Change Repurchase Date, and
shall deliver the Notes to the Paying Agent as set forth in the Indenture. 
 Holders have the right to withdraw (in whole or in
part) any Fundamental Change Repurchase Notice by delivering to the Paying Agent a written notice of withdrawal in accordance with the provisions of the Indenture. 
 If cash sufficient to pay the Fundamental Change Repurchase Price of all Notes or portions thereof to be purchased with respect to a Fundamental Change Repurchase Date is deposited with the Paying Agent
by 10:00 a.m., New York City time, on the Fundamental Change Repurchase Date, then, immediately after such Fundamental Change Repurchase Date, such Notes shall cease to be outstanding and interest (including Additional Interest, if any) on such
Notes shall cease to accrue, whether or not such Notes are delivered by their Holders to the Paying Agent, and the Holders thereof shall have no other rights as such (other than the right to receive the Fundamental Change Repurchase Price upon
delivery of such Notes by their Holders to the Paying Agent). 
  

	 	8.	Purchase by the Company at the Option of the Holder. 

 Subject to the terms and conditions of the Indenture, the Company shall become obligated to purchase, at the option of any Holder, all or any portion of the Notes held by such Holder on July 1, 2017
(the “Option Purchase Date”) in principal amounts of $1,000 or multiples of $1,000 at an Option Purchase Price, payable in cash, equal to one hundred percent (100%) of the principal amount of the Notes to be purchased, plus
accrued and unpaid interest, if any, to, but excluding, the Option Purchase Date, upon delivery of an Option Purchase Notice containing the information set forth in the Indenture. To exercise such right, a Holder shall deliver to the Paying Agent,
and the Paying Agent must receive, an Option Purchase Notice containing the information set forth in the Indenture, at any 

  
 5 

 
time from the opening of business on the date that is twenty (20) Business Days prior to the Option Purchase Date until the close of business on the Business Day immediately preceding the
Option Purchase Date, and shall deliver the Notes to the Paying Agent as set forth in the Indenture. 
 Holders have the right
to withdraw (in whole or in part) an Option Purchase Notice by delivering to the Paying Agent a written notice of withdrawal in accordance with the provisions of the Indenture. 

If cash sufficient to pay the Option Purchase Price of all Notes or portions thereof to be purchased with respect to Option Purchase Date
is deposited with the Paying Agent by 10:00 a.m., New York City time, on the Option Purchase Date, then, immediately after such Option Purchase Date, such Notes shall cease to be outstanding and interest (including Additional Interest, if any) on
such Notes shall cease to accrue, whether or not such Notes are delivered by their Holders to the Paying Agent, and the Holders thereof shall have no other rights as such (other than the right to receive the Option Purchase Price upon delivery of
such Notes by their Holders to the Paying Agent). 
  

	 	9.	Conversion. 

 Subject to
the terms and conditions of the Indenture, the Holder hereof has the right, at any time prior to the Close of Business on the third Business Day immediately preceding the Maturity Date, to convert the principal amount hereof or any portion of such
principal which is $1,000 or a multiple thereof, into shares of Common Stock at the Conversion Rate specified in the Indenture. The initial Conversion Rate is 175.6697 shares of Common Stock per $1,000 principal amount of Notes, subject to
adjustment in certain events described in the Indenture. 
 In the event a Holder elects to exercise its right to convert its
Notes, and such election occurs on or after January 1, 2013 but prior to July 1, 2017, such Holder shall be entitled to receive, in addition to the consideration that such Holder is entitled to receive upon conversion, a Coupon Make-Whole
Payment. The Company shall have thirty (30) days from the Conversion Date to pay the Coupon Make-Whole Payment. The Company may pay any Coupon Make-Whole Payments either in cash or in Common Stock, at its election. If the Company elects to pay
a Coupon Make-Whole Payment in Common Stock, such stock will be valued at 90% of the simple average of the daily volume weighted average prices of the Common Stock for the 10 Trading Days ending on and including the Trading Day immediately preceding
the Conversion Date. 
 No fractional shares will be issued upon any conversion, but an adjustment and payment in cash will be made, as provided
in the Indenture, in respect of any fraction of a share which would otherwise be issuable upon the surrender of any Notes for conversion. 
  

	 	10.	Denominations; Transfer; Exchange. 

 The Notes are in registered form, without coupons, in denominations of $1,000 and multiples of $1,000. A Holder may register the transfer of or exchange Notes in accordance with the Indenture. The
Registrar may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and to pay any taxes, assessments or other governmental charges that may be imposed in relation thereto by law or permitted by the
Indenture. 
  

	 	11.	Unclaimed Money or Securities. 

 The Trustee and the Paying Agent shall return to the Company upon request any cash or securities held by them for the payment of any amount with respect to the Notes that remains unclaimed for two years,
subject to applicable unclaimed property law. After return to the Company, Holders entitled to the cash or securities must look to the Company for payment as general creditors unless an applicable abandoned property law designates another Person.

  
 6 

	 	12.	Amendment, Supplement and Waiver. 

 Subject to certain exceptions, the Notes or the Indenture may be amended or supplemented with the consent of the Holders of at least a majority in aggregate principal amount of the Notes then outstanding,
and subject to certain exceptions, an existing Default or Event of Default with respect to the Notes and its consequence or compliance with any provision of the Notes or the Indenture may be waived with the consent of the Holders of at least a
majority in aggregate principal amount of the Notes then outstanding. Without the consent of or notice to any Holder, the Company and the Trustee may amend or supplement the Indenture or the Notes to, among other things, cure any ambiguity, defect,
manifest error, omission or inconsistency or make any change that does not adversely affect the rights under the Indenture of any Holder of outstanding Notes. 
  

	 	13.	Defaults and Remedies. 

If any Event of Default other than as a result of certain events of bankruptcy, insolvency or reorganization of the Company occurs and is
continuing, the principal of all the Notes then outstanding plus accrued and unpaid interest (including Additional Interest, if any), may be declared due and payable in the manner and with the effect provided in the Indenture. If an Event of Default
occurs as a result of certain events of bankruptcy, insolvency or reorganization of the Company, the principal amount of the Notes plus accrued and unpaid interest (including Additional Interest, if any) shall become due and payable immediately
without any declaration or other act on the part of the Trustee or any Holder, all to the extent provided in the Indenture. 
  

	 	14.	Authentication. 

 This
Note shall not be valid until the Trustee or an authenticating agent manually signs the certificate of authentication on this Note. 
  

	 	15.	Abbreviations. 

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

	 	16.	Indenture to Control; Governing Law. 

 To the extent permitted by applicable law, if any provision of this Note conflicts with the express provisions of the Indenture, the provisions of the Indenture shall govern and be controlling.

 This Note shall be governed by and construed in accordance with the laws of the state of New York (without giving effect to the conflict
of laws principles thereof). 

  
 7 

 SCHEDULE OF EXCHANGES OF NOTES2

 The following exchanges, purchases or conversions of a part of this
Global Note have been made: 
  

									
	 Date of
 Decrease or
 Increase
	  	 Signature of
 Authorized
 Signatory of

Trustee or

Custodian
	  	 Decrease in
 Principal
 Amount of this

Global Note
	  	 Increase in
 Principal
 Amount of this

Global Note
	  	 Principal
 Amount of this
 Global Note

Following Such
 Decrease or
 Increase

		  		  		  		  	
		  		  		  		  	
		  		  		  		  	
		  		  		  		  	
		  		  		  		  	

  

	2 	This schedule is to be included only if the Notes is a Global Note. 

  
 8 

 ASSIGNMENT FORM 
 If you want to assign this Note, fill in the form below and have your signature guaranteed: 
 I or
we assign and transfer this Note to: 
  

					
	  
	  		  	
			
	  
	  		  	
			
	  
	  		  	
			
	  
	  		  	

 (Print or type name, address and zip code and social security or tax ID number of assignee) 

and irrevocably appoint
                                        
                     agent to transfer this Note on the books of the Company. The agent may substitute another to act for him. 

 

									
	Date:	 	              
	 		 	Signed:	 	  

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

  

			
	 Signature

Guarantee:
	 	  

 Note: Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the
Security Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Security
Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended. 

  
 9 

 CONVERSION NOTICE 
 If you want to exercise the option to convert this Note in accordance with the terms of the Indenture referred to in this Note, check the box: ≈ 

To convert only part of this Note, state the Principal Amount to be converted (which must be $1,000 or a multiple of $1,000, provided that the portion
not so converted is in a minimum Principal Amount of $1,000): 

$                      
   
 If you want the share certificate, if any, made out in another person’s name, fill in the form below: 

 

					
	  
	  		  	
	(Insert other person’s social security or tax ID no.)	  		  	
			
	  
	  		  	
			
	  
	  		  	
			
	  
	  		  	

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

 

									
	Date:	 	              
	 		 	Signed:	 	  

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

  

			
	 Signature

Guarantee:
	 	  

 Note: Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the
Security Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Security
Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended. 

  
 10 

 FORM OF PURCHASE NOTICE 
 Certificate No. of Security:              
 If you want to elect to have this Security purchased by the Company pursuant to Section 4.01 of the Supplemental Indenture, check the box: ≈ 

If you want to elect to have this Security purchased by the Company pursuant to Section 4.02 of the Supplemental Indenture, check the box: ≈

 If you want to elect to have only part of this Security purchased by the Company pursuant to Section 4.01 or Section 4.02 of the
Supplemental Indenture, as applicable, state the principal amount to be so purchased by the Company: 
 $
                                         
                
 (in an integral multiple of
$1,000) 
  

									
	Date:	 	  
	 		 	Signature(s):	 	  

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

  

			
	Signature Guarantee:	 	  

 Note: Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the
Security Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Security
Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended. 

  
 11

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