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	  


  
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	 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. 

  
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 “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). 

  
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 “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. 

  
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 “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. 

  
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 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 

  
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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. 

  
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 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. 

  
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 (b) If the Company shall act as its own Paying Agent, it will, on or before each due date of
the principal 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


  
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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; 

  
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 (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 

  
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 (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 

  
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 (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). 

  
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 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


  
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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. 

  
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 (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. 

  
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 (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. 

  
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 (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	  	


  
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 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); 

  
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 (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.


  
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 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	  	


  
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 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 

  
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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


  
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 (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. 

  
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 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; 

  
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 (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 

  
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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 

  
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 (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 

  
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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 

  
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 (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