Document:

EX-4.2

EXHIBIT 4.2

SECOND DEED OF AMENDMENT OF OPTION DEED

THIS DEED is made the 27 day of September, 2005

	 	 	 
	BETWEEN:

	 	CONSOLIDATED WATER CO. LTD. (formerly CAYMAN WATER COMPANY

LIMITED), a Cayman Islands company having its registered

office at Regatta Office Park, Windward Three, Fourth

Floor, P.O. Box 1114 GT, Grand Cayman B.W.I. (the

“Company”)
	 
	 	 
	AND:

	 	AMERICAN STOCK TRANSFER & TRUST COMPANY of 40 Wall Street,

New York, New York 10005, United States of America (the

“Option Agent”)

RECITALS:-

	 	(1)	 	By an Option Deed dated as of August 6, 1997 (the “Option Deed”) the Directors of the Company
granted to the holders of its Ordinary and Redeemable Preference Shares at any time before the
Distribution Date options to subscribe for one one-hundredth of a Class B Share for each
Ordinary or Redeemable Preference Share held (as that number may afterwards be adjusted
pursuant to Section 11(b) of the Option Deed) on the terms set out in the Option Deed;

	 	(2)	 	By a Deed of Amendment of Option Deed dated the 8th day of August 2005 (“the First
Amendment Deed”), the Company and the Option Agent amended the Option Deed as stated therein;

	 	(3)	 	On 17th August 2005, the Company’s Memorandum of Association was altered by
subdividing all its Ordinary and Redeemable Preference Shares, issued and unissued, and
including the Class B Shares, from a par value of CI$1.00 to a par value of CI$0.50 each;

	 	(4)	 	The Company wishes to further amend the Option Deed to reflect the subdivision of its shares,
to correct a clerical error in paragraph 2(ii) of the First Amendment Deed and to restate the
amendments made by the First Amendment Deed and this Deed into this Deed;

	 	(5)	 	Under Section 26 of the Option Deed the Company and the Option Agent are empowered on the
Company’s direction to amend the Option Deed before the Distribution Date without the approval
of the holders of the certificates representing Ordinary Shares and Redeemable Performance
Shares; and

	 	(6)	 	The Distribution Date has not yet occurred.

NOW THIS DEED WITNESSES as follows:

	 	1.	 	For the purposes of this Deed:-

	 	(i)	 	capitalized words not otherwise defined in it have the meanings assigned to
them in the Option Deed; and

	 	(ii)	 	references to Sections and paragraphs are references to Sections and paragraphs
of the Option Deed;

	 	2.	 	The Company and the Option Agent REVERSE the amendments made by the First Amendment Deed and
now RE-AMEND the Option Deed as follows:-

	 	(i)	 	by deleting the expression “US$37.50” where it appears in:

	 	a.	 	Section 7, paragraph (b); and

	 	b.	 	Exhibit B; and

	 	c.	 	the first paragraph of Exhibit C

and substituting therefor in each case the expression “US$50.00”;

	 	(ii)	 	by deleting the expression “CI$1.00” wherever it appears and substituting the
expression “CI$0.50”; and

	 	(iii)	 	by deleting the sixth paragraph of Exhibit C and substituting therefor the
following:-

“For example, at an exercise price of US$50.00 per Option, each Option not
owned by an Acquiring Person (or by certain related parties) following an
event set out in the preceding paragraph would entitle its holder to
purchase US$100.00 worth of Ordinary Shares (or other consideration, as
noted above) for US$50.00. Assuming that the Ordinary Shares had a per
share value of US$20.00 at such time, the holder of each valid Option would
be entitled to purchase 5 Ordinary Shares for US$50.00.”

	 	3.	 	In all other respects the Company and the Option Agent confirm the Option Deed.

IN WITNESS WHEREOF, the parties have caused this Deed to be duly executed and delivered as such as
of the day and year first above written.

	 	 	 
	EXECUTED as a deed and delivered on

	 	CONSOLIDATED WATER CO. LTD.
	 
	 	 
	Behalf of CONSOLIDATED WATER CO.

	 	

	 
	 	 
	LTD. by Frederick W. McTaggart, Director

	 	

	 
	 	 
	In the presence of:-

	 	

	 
	 	 
	
 
	 	Per /s/ Frederick W. McTaggart
	 
	 	 
	
 
	 	Director
	 
	 	 
	/s/ Brent Santha

	 	

	 
	 	 
	Witness

	 	

	 
	 	 
	Brent Santha

	 	

	 
	 	 
	EXECUTED as a deed and delivered on

	 	AMERICAN STOCK TRANSFER &
	 
	 	 
	Behalf of AMERICAN STOCK

	 	TRUST COMPANY
	 
	 	 
	TRANSFER & TRUST COMPANY by

	 	

	 
	 	 
	Herbert J. Lemmer, Vice President

	 	

	 
	 	 
	In the presence of:-

	 	

	 
	 	 
	
 
	 	Per /s/ Herbert J. Lemmer
	 
	 	 
	
 
	 	Vice-President
	 
	 	 
	/s/ eligible

	 	

	 
	 	 
	WitnessEX-4.3

EXHIBIT 4.3

CONSOLIDATED WATER CO. LTD.

CERTIFIED EXTRACT OF A RESOLUTION OF THE SHAREHOLDERS OF CONSOLIDATED WATER CO. LTD (THE “COMPANY”)
PASSED AT THE ANNUAL GENERAL MEETING OF THE SHAREHOLDERS DULY CONVENED AND HELD ON THE
17TH DAY OF AUGUST 2005

IT WAS RESOLVED:

THAT:

“The Company approve an alteration to the Memorandum of Association by subdividing the issued and
unissued Ordinary Shares (Class A and Class B) and the issued and unissued Redeemable Preference
Shares from CI$1.00 par value (the “Old Shares”) to CI$0.50 par value (the “New Shares”).”

This subdivision will create two New Shares for each Old Share with a record date of August 17,
2005 and a distribution date of August 24, 2005.

	 	 	 
	/s/ Brent Santha

     

Certified by the Company Secretary

	 	September 30, 2005

     

Date

Brent J. SanthaEX-10.1

CYBERONICS, INC.

as Issuer

and

WELLS FARGO BANK, NATIONAL ASSOCIATION

as Trustee

INDENTURE

Dated as of September 27, 2005

1

3.0% SENIOR SUBORDINATED CONVERTIBLE NOTES DUE 2012

CROSS-REFERENCE TABLE

	 	 	 	 	 
	 	 	Indenture
	TIA Section	 	Section
	310(a)(1)

	 	 	5.11	 
	 
	 	 	 	 
	(a)(2)

	 	 	5.11	 
	 
	 	 	 	 
	(a)(3)

	 	 	n/a	 
	 
	 	 	 	 
	(a)(4)

	 	 	n/a	 
	 
	 	 	 	 
	(a)(5)

	 	 	5.11	 
	 
	 	 	 	 
	(b)

	 	5.3;

5.11

	 
	 	 	 	 
	(c)

	 	 	n/a	 
	 
	 	 	 	 
	311(a)

	 	 	5.12	 
	 
	 	 	 	 
	(b)

	 	 	5.12	 
	 
	 	 	 	 
	(c)

	 	 	n/a	 
	 
	 	 	 	 
	312(a)

	 	 	2.10	 
	 
	 	 	 	 
	(b)

	 	 	14.3	 
	 
	 	 	 	 
	(c)

	 	 	14.3	 
	 
	 	 	 	 
	313(a)

	 	 	5.7	 
	 
	 	 	 	 
	(b)(1)

	 	 	n/a	 
	 
	 	 	 	 
	(b)(2)

	 	 	5.7	 
	 
	 	 	 	 
	(c)

	 	5.7;

14.2

	 
	 	 	 	 
	(d)

	 	 	5.7	 
	 
	 	 	 	 
	314(a)(1), (2), (3)

	 	9.6;

14.6

	 
	 	 	 	 
	(a)(4)

	 	9.6;

9.7;

14.6

	 
	 	 	 	 
	(b)

	 	 	n/a	 
	 
	 	 	 	 
	(c)(1)

	 	 	14.5	 
	 
	 	 	 	 
	(c)(2)

	 	 	14.5	 
	 
	 	 	 	 
	(c)(3)

	 	 	n/a	 
	 
	 	 	 	 
	(d)

	 	 	n/a	 
	 
	 	 	 	 
	(e)

	 	 	14.6	 
	 
	 	 	 	 
	(f)

	 	 	n/a	 
	 
	 	 	 	 
	315(a)

	 	 	5.1	(a)
	 
	 	 	 	 
	(b)

	 	5.6;

14.2

	 
	 	 	 	 
	(c)

	 	 	5.1	(b)
	 
	 	 	 	 
	(d)

	 	 	5.1	(c)
	 
	 	 	 	 
	(e)

	 	 	4.14	 
	 
	 	 	 	 
	316(a)(last sentence)

	 	 	2.13	 
	 
	 	 	 	 
	(a)(1)(A)

	 	 	4.5	 
	 
	 	 	 	 
	(a)(1)(B)

	 	 	4.4	 
	 
	 	 	 	 
	(a)(2)

	 	 	n/a	 
	 
	 	 	 	 
	(b)

	 	 	4.7	 
	 
	 	 	 	 
	(c)

	 	 	7.4	 
	 
	 	 	 	 
	317(a)(1)

	 	 	4.8	 
	 
	 	 	 	 
	(a)(2)

	 	 	4.9	 
	 
	 	 	 	 
	(b)

	 	 	2.5	 
	 
	 	 	 	 
	318(a)

	 	 	14.1	 
	 
	 	 	 	 
	(b)

	 	 	n/a	 
	 
	 	 	 	 
	(c)

	 	 	14.1	 

“n/a” means not applicable

This Cross-Reference Table shall not, for any purpose, be deemed to be a part of the Indenture

2

TABLE OF CONTENTS

Page

	 	 	 	ARTICLE 1 DEFINITIONS AND INCORPORATION BY REFERENCE	 

	 	 	 	SECTION 1.1. Definitions	 

	 	 	 	SECTION 1.2. Incorporation by Reference of Trust Indenture Act	 

	 	 	 	SECTION 1.3. Rules of Construction	 

	 	 	 	ARTICLE 2 THE SECURITIES	 

	 	 	 	SECTION 2.1. Title and Terms	 

	 	 	 	SECTION 2.2. Form of Securities	 

	 	 	 	SECTION 2.3. Legend	 

	 	 	 	SECTION 2.4. Execution, Authentication, Delivery and Dating	 

	 	 	 	SECTION 2.5. Registrar and Paying Agent	 

	 	 	 	SECTION 2.6. Paying Agent to Hold Assets in Trust	 

	 	 	 	SECTION 2.7. General Provisions Relating to Transfer and Exchange	 

	 	 	 	SECTION 2.8. Book-Entry Provisions for the Global Securities	 

	 	 	 	SECTION 2.9. [Reserved]	 

	 	 	 	SECTION 2.10. Holder Lists	 

	 	 	 	SECTION 2.11. Persons Deemed Owners	 

	 	 	 	SECTION 2.12. Mutilated, Destroyed, Lost or Stolen Securities	 

	 	 	 	SECTION 2.13. Treasury Securities	 

	 	 	 	SECTION 2.14. Temporary Securities	 

	 	 	 	SECTION 2.15. Cancellation	 

	 	 	 	SECTION 2.16. CUSIP Numbers	 

	 	 	 	SECTION 2.17. Defaulted Interest	 

	 	 	 	SECTION 2.18. Registration Default	 

	 	 	 	ARTICLE 3 SATISFACTION AND DISCHARGE	 

	 	 	 	SECTION 3.1. Satisfaction and Discharge of Indenture	 

	 	 	 	SECTION 3.2. Deposited Monies To Be Held in Trust	 

	 	 	 	SECTION 3.3. Return of Unclaimed Monies	 

	 	 	 	ARTICLE 4 DEFAULTS AND REMEDIES	 

	 	 	 	SECTION 4.1. Events of Default	 

	 	 	 	SECTION 4.2. Acceleration of Maturity; Rescission and Annulment	 

	 	 	 	SECTION 4.3. Other Remedies	 

	 	 	 	SECTION 4.4. Waiver of Past Defaults	 

	 	 	 	SECTION 4.5. Control by Majority	 

	 	 	 	SECTION 4.6. Limitation on Suit	 

	 	 	 	SECTION 4.7. Unconditional Rights of Holders to Receive Payment and to Convert	 

	 	 	 	SECTION 4.8. Collection of Indebtedness and Suits for Enforcement by the Trustee	 

	 	 	 	SECTION 4.9. Trustee May File Proofs of Claim	 

	 	 	 	SECTION 4.10. Restoration of Rights and Remedies	 

	 	 	 	SECTION 4.11. Rights and Remedies Cumulative	 

	 	 	 	SECTION 4.12. Delay or Omission Not Waiver	 

	 	 	 	SECTION 4.13. Application of Money Collected	 

	 	 	 	SECTION 4.14. Undertaking for Costs	 

	 	 	 	SECTION 4.15. Waiver of Stay or Extension Laws	 

	 	 	 	ARTICLE 5 THE TRUSTEE	 

	 	 	 	SECTION 5.1. Certain Duties and Responsibilities	 

	 	 	 	SECTION 5.2. Certain Rights of Trustee	 

	 	 	 	SECTION 5.3. Individual Rights of Trustee	 

	 	 	 	SECTION 5.4. Money Held in Trust	 

	 	 	 	SECTION 5.5. Trustee’s Disclaimer	 

	 	 	 	SECTION 5.6. Notice of Defaults	 

	 	 	 	SECTION 5.7. Reports by Trustee to Holders	 

	 	 	 	SECTION 5.8. Compensation and Indemnification	 

	 	 	 	SECTION 5.9. Replacement of Trustee	 

	 	 	 	SECTION 5.10. Successor Trustee by Merger, Etc	 

	 	 	 	SECTION 5.11. Corporate Trustee Required; Eligibility	 

	 	 	 	SECTION 5.12. Collection of Claims Against the Company	 

	 	 	 	ARTICLE 6 CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE	 

	 	 	 	SECTION 6.1. Company May Consolidate, Etc. Only on Certain Terms	 

	 	 	 	SECTION 6.2. Successor Substituted	 

	 	 	 	ARTICLE 7 AMENDMENTS, SUPPLEMENTS AND WAIVERS	 

	 	 	 	SECTION 7.1. Without Consent of Holders of Securities	 

	 	 	 	SECTION 7.2. With Consent of Holders of Securities	 

	 	 	 	SECTION 7.3. Compliance with Trust Indenture Act	 

	 	 	 	SECTION 7.4. Revocation of Consents and Effect of Consents or Votes	 

	 	 	 	SECTION 7.5. Notation on or Exchange of Securities	 

	 	 	 	SECTION 7.6. Trustee to Sign Amendment, Etc	 

	 	 	 	ARTICLE 8 MEETING OF HOLDERS OF SECURITIES	 

	 	 	 	SECTION 8.1. Purposes for Which Meetings May Be Called	 

	 	 	 	SECTION 8.2. Call Notice and Place of Meetings	 

	 	 	 	SECTION 8.3. Persons Entitled to Vote at Meetings	 

	 	 	 	SECTION 8.4. Quorum; Action	 

	 	 	 	SECTION 8.5. Determination of Voting Rights; Conduct and Adjournment of Meetings	 

	 	 	 	SECTION 8.6. Counting Votes and Recording Action of Meetings	 

	 	 	 	ARTICLE 9 COVENANTS	 

	 	 	 	SECTION 9.1. Payment of Principal, Premium and Interest	 

	 	 	 	SECTION 9.2. Maintenance of Offices or Agencies	 

	 	 	 	SECTION 9.3. Corporate Existence	 

	 	 	 	SECTION 9.4. Maintenance of Properties	 

	 	 	 	SECTION 9.5. Payment of Taxes and Other Claims	 

	 	 	 	SECTION 9.6. Reports	 

	 	 	 	SECTION 9.7. Compliance Certificate	 

	 	 	 	SECTION 9.8. [Reserved]	 

	 	 	 	SECTION 9.9. Additional Interest Amounts Notice	 

	 	 	 	ARTICLE 10 [RESERVED]	 

	 	 	 	ARTICLE 11 REPURCHASE OF SECURITIES	 

	 	 	 	SECTION 11.1. Repurchase Right Upon Fundamental Change.	 

	 	 	 	SECTION 11.2. [Reserved]	 

	 	 	 	SECTION 11.3. Notices; Method of Exercising Repurchase Right, Etc	 

	 	 	 	ARTICLE 12 CONVERSION OF SECURITIES	 

	 	 	 	SECTION 12.1. Conversion Right and Conversion Rate.	 

	 	 	 	SECTION 12.2. Exercise of Conversion Right	 

	 	 	 	SECTION 12.3. Fractions of Shares	 

	 	 	 	SECTION 12.4. Adjustment of Conversion Rate	 

	 	 	 	SECTION 12.5. Notice of Adjustments of Conversion Rate	 

	 	 	 	SECTION 12.6. Notice Prior to Certain Actions	 

	 	 	 	SECTION 12.7. Company to Reserve Common Stock	 

	 	 	 	SECTION 12.8. Taxes on Conversions	 

	 	 	 	SECTION 12.9. Covenant as to Common Stock	 

	 	 	 	SECTION 12.10. Cancellation of Converted Securities	 

	 	 	 	SECTION 12.11. Effect of Recapitalization, Reclassification, Consolidation, Merger or Sale	 

	 	 	 	SECTION 12.12. Responsibility of Trustee for Conversion Provisions	 

	 	 	 	SECTION 12.13. Make-Whole Premium	 

	 	 	 	ARTICLE 13 SUBORDINATION	 

	 	 	 	SECTION 13.1. Securities Subordinated to Senior Debt	 

	 	 	 	SECTION 13.2. Subrogation	 

	 	 	 	SECTION 13.3. Obligation of the Company Is Absolute and Unconditional	 

	 	 	 	SECTION 13.4. Maturity of or Default on Senior Debt	 

	 	 	 	SECTION 13.5. Payments on Securities Permitted	 

	 	 	 	SECTION 13.6. Effectuation of Subordination by Trustee	 

	 	 	 	SECTION 13.7. Knowledge of Trustee	 

	 	 	 	SECTION 13.8. Trustee’s Relation to Senior Debt	 

	 	 	 	SECTION 13.9. Rights of Holders of Senior Debt Not Impaired	 

	 	 	 	SECTION 13.10. Modification of Terms of Senior Debt	 

	 	 	 	SECTION 13.11. Certain Conversions Not Deemed Payment	 

	 	 	 	ARTICLE 14 OTHER PROVISIONS OF GENERAL APPLICATION	 

	 	 	 	SECTION 14.1. Trust Indenture Act Controls	 

	 	 	 	SECTION 14.2. Notices	 

	 	 	 	SECTION 14.3. Communication by Holders with Other Holders	 

	 	 	 	SECTION 14.4. Acts of Holders of Securities.	 

	 	 	 	SECTION 14.5. Certificate and Opinion as to Conditions Precedent	 

	 	 	 	SECTION 14.6. Statements Required in Certificate or Opinion	 

	 	 	 	SECTION 14.7. Effect of Headings and Table of Contents	 

	 	 	 	SECTION 14.8. Successors and Assigns	 

	 	 	 	SECTION 14.9. Separability Clause	 

	 	 	 	SECTION 14.10. Benefits of Indenture	 

	 	 	 	SECTION 14.11. Governing Law	 

	 	 	 	SECTION 14.12. Counterparts	 

	 	 	 	SECTION 14.13. Legal Holidays	 

	 	 	 	SECTION 14.14. Recourse Against Others	 

3

INDENTURE, dated as of September 27, 2005, between CYBERONICS, INC., a corporation duly
organized and existing under the laws of the State of Delaware, having its principal office at 100
Cyberonics Boulevard, Houston, Texas 77058 (the “Issuer” or the “Company”), and WELLS FARGO BANK,
NATIONAL ASSOCIATION, as Trustee (the “Trustee”), having its principal corporate trust office at
505 Main Street, Suite 301, Fort Worth, TX 76102 .

RECITALS OF THE COMPANY

The Company has duly authorized the creation of an issue of its 3.0% Senior Subordinated
Convertible Notes due 2012 (herein called the “Securities”) of substantially the tenor and amount
hereinafter set forth, and to provide therefor the Company has duly authorized the execution and
delivery of this Indenture.

All things necessary to make the Securities, when the Securities are executed by the Company
and authenticated and delivered hereunder and duly issued by the Company, the valid obligations of
the Company, and to make this Indenture a valid agreement of the Company, in accordance with their
and its terms, have been done.

NOW, THEREFORE, THIS INDENTURE WITNESSETH:

For and in consideration of the premises and the purchase of the Securities by the Holders
thereof, it is mutually covenanted and agreed, for the equal and proportionate benefit of all
Holders of the Securities, as follows:

ARTICLE 1

DEFINITIONS AND INCORPORATION BY REFERENCE

SECTION 1.1. Definitions. For all purposes of this Indenture and the Securities, the
following terms are defined as follows:

“Act”, when used with respect to any Holder of a Security, has the meaning specified in
Section 14.4(a) hereof.

“Additional Interest Amount” means the additional interest amount payable by the Company upon
the occurrence of a Registration Default (as defined in the Registration Rights Agreement), in the
manner and in the amounts provided by the Registration Rights Agreement.

“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 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.

“Bankruptcy Law” means Title 11 of the U.S. Code or any similar federal or state law for the
relief of debtors.

“Board of Directors” means either the board of directors of the Company or any committee of
that board empowered to act for it with respect to this Indenture.

“Board Resolution” means a resolution duly adopted by the Board of Directors, a copy of which,
certified by the Secretary or an Assistant Secretary of the Company to be in full force and effect
on the date of such certification, shall have been delivered to the Trustee.

“Business Combination” means any of the following events:

(1) any recapitalization, reclassification or change of our common stock, other than changes
resulting from a subdivision or combination,

(2) a consolidation, merger or combination involving us,

(3) a sale, conveyance or lease to another person of all or substantially all of our property
and assets, or

(4) any statutory share exchange.

“Business Day”, when used with respect to any Place of Payment or Place of Conversion, means
each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which banking
institutions in that Place of Payment or Place of Conversion, as the case may be, are authorized or
obligated by law to close.

“Change of Control” means the occurrence of any of the following after the original issuance
of the Securities:

(1) the acquisition by any person, including any syndicate or group deemed to be a “person”
under Section 13(d)(3) of the Exchange Act, of beneficial ownership, directly or indirectly,
through a purchase, merger or other acquisition transaction or series of transactions, of shares of
capital stock of the Company entitling such person to exercise 50% or more of the total voting
power of all shares of capital stock of the Company entitled to vote generally in elections of
directors, other than any such acquisition by the Company, any subsidiary of the Company or any
employee benefit plan of the Company;

(2) any consolidation or merger of the Company with or into any other person, any merger of
another person into the Company, or any conveyance, transfer, sale, lease or other disposition of
all or substantially all of the properties and assets of the Company to another person, other than
(a) any such transaction (x) that does not result in any reclassification, conversion, exchange or
cancellation of outstanding shares of capital stock of the Company and (y) pursuant to which
holders of capital stock of the Company immediately prior to such transaction have the entitlement
to exercise, directly or indirectly, 50% or more of the total voting power of all shares of capital
stock of the Company entitled to vote generally in the election of directors of the continuing or
surviving person immediately after such transaction or (b) any merger which is effected primarily
to change the jurisdiction of incorporation of the Company and results in a reclassification,
conversion or exchange of outstanding shares of Common Stock solely into shares of common stock of
the surviving entity;

(3) during any consecutive two-year period, individuals who at the beginning of that two-year
period constituted the Board of Directors (together with any new directors whose election to the
Board of Directors, or whose nomination for election by the stockholders of the Company, was
approved by a vote of a majority of the directors then still in office who were either directors at
the beginning of such period or whose elections or nominations for election were previously so
approved) cease for any reason to constitute a majority of the Board of Directors then in office;
or

(4) the Company is liquidated or dissolved or a resolution is passed by the Company’s
stockholders approving a plan of liquidation or dissolution of the Company other than in a
transaction which complies with the provisions described in Article 6 of this Indenture.

Beneficial ownership shall be determined in accordance with Rule 13d-3 promulgated by the SEC
under the Exchange Act. The term “person” shall include any syndicate or group which would be
deemed to be a “person” under Section 13(d)(3) of the Exchange Act.

“Chief Executive Officer” means the chief executive officer of the Company.

“Closing Price” of any security on any date of determination means:

(1) the closing sale price (or, if no closing sale price is reported, the last reported sale
price) of such security (regular way) on the New York Stock Exchange on such date;

(2) if such security is not listed for trading on the New York Stock Exchange on any such
date, the closing sale price as reported in the composite transactions for the principal U.S.
securities exchange on which such security is so listed;

(3) if such security is not so listed on a U.S. national or regional securities exchange, the
closing sale price as reported by the Nasdaq National Market or Nasdaq SmallCap Market;

(4) if such security is not so reported, the last quoted bid price for such security in the
over-the-counter market as reported by the National Quotation Bureau or similar organization; or

(5) if such bid price is not available, the average of the mid-point of the last bid and ask
prices of such security on such date from at least three nationally recognized independent
investment banking firms retained for this purpose by the Company.

“Common Stock” means any stock of any class of the Company which has no preference in respect
of dividends or of amounts payable in the event of any voluntary or involuntary liquidation,
dissolution or winding up of the Company and which is not subject to redemption by the Company.
However, subject to the provisions of Section 12.11 hereof, shares issuable on conversion of
Securities shall include only shares of the class designated as Common Stock, par value $0.01 per
share, of the Company at the date of this Indenture or shares of any class or classes resulting
from any reclassification or reclassifications thereof and which have no preference in respect of
dividends or of amounts payable in the event of any voluntary or involuntary liquidation,
dissolution or winding up of the Company and which are not subject to redemption by the Company,
provided, however, that if at any time there shall be more than one such resulting class, the
shares of each such class then so issuable shall be substantially in the proportion which the total
number of shares of such class resulting from all such reclassifications bears to the total number
of shares of all such classes resulting from all such reclassifications.

“Company” means the corporation named as the “Company” in the first paragraph of this
instrument until a successor corporation shall have become such pursuant to the applicable
provisions of this Indenture, and thereafter “Company” shall mean such successor corporation.

“Company Notice” has the meaning specified in Section 11.3 hereof.

“Company Order” means a written order signed in the name of the Company by both (1) the Chief
Executive Officer, the President or a Vice President and (2) so long as not the same as the officer
signing pursuant to clause (1), the Chief Financial Officer, the Treasurer, the Secretary or any
Assistant Secretary of the Company, and delivered to the Trustee.

“Conversion Agent” means any Person authorized by the Company to convert Securities in
accordance with Article 12 hereof.

“Conversion Price” shall equal (i) $1,000 divided by (ii) the Conversion Rate for $1,000
principal amount of Securities.

“Conversion Rate” has the meaning specified in Section 12.1 hereof.

“Corporate Trust Office” means for purposes of presentation or surrender of Securities for
payment, registration, transfer, exchange or conversion or for service of notices or demands upon
the Company, the office of the Trustee located in the City of New York (which at the date of this
Indenture is located at Wells Fargo Corporate Trust, c/o The Depository Trust Company, 1st Floor,
TADS Dept., 55 Water Street, New York, NY 10041), and for all other purposes, the office of the
Trustee located in the City of Fort Worth, Texas (which at the date of this Indenture is located at
505 Main Street, Suite 301, Forth Worth, Texas 76102).

“Corporation” means corporations, associations, limited liability companies, companies and
business trusts.

“Current Market Price” has the meaning set forth in Section 12.4(g).

“Custodian” means any receiver, trustee, assignee, liquidator, sequestrator or similar
official under any Bankruptcy Law.

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

“Defaulted Interest” has the meaning specified in Section 2.17 hereof.

“Depositary” means The Depository Trust Company, its nominees and their respective successors.

“Designated Senior Debt” means Senior Debt of the Company which, at the date of determination,
has an aggregate amount outstanding of, or under which, at the date of determination, the holders
thereof are committed to lend up to, at least $10.0 million and is specifically designated in the
instrument, agreement or other document evidencing or governing that Senior Debt as “Designated
Senior Debt” for purposes of this Indenture.

“Dollar,” “U.S. Dollar” or “U.S. $” means a dollar or other equivalent unit in such coin or
currency of the United States as at the time shall be legal tender for the payment of public and
private debts.

“DTC Participants” has the meaning specified in Section 2.8 hereof.

“Event of Default” has the meaning specified in Section 4.1 hereof.

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

“Expiration Time” has the meaning specified in Section 12.4(f) hereof.

“fair market value” has the meaning set forth in Section 12.4(g) hereof.

“Fundamental Change” means the occurrence of either a Change of Control or a Termination of
Trading.

“Fundamental Change Effective Date” means the date on which any Fundamental Change becomes
effective.

“Global Security” has the meaning specified in Section 2.2 hereof.

“Guarantee” means any obligation, contingent or otherwise, of any Person, directly or
indirectly guaranteeing any Indebtedness of any other Person and any obligation, direct or
indirect, contingent or otherwise, of such Person:

(1) to purchase or pay (or advance or supply funds for the purchase or payment of) such
Indebtedness of such other Person (whether arising by virtue of partnership arrangements, or by
agreement to keep-well, to purchase assets, goods, securities or services, to take-or-pay, or
maintain financial statement conditions or otherwise); or

(2) entered into for purposes of assuring in any other manner the obligee of such Indebtedness
of the payment thereof or to protect such obligee against loss in respect thereof (in whole or in
part);

provided, however, that the term “guarantee” will not include endorsements for collection or
deposit in the ordinary course of business. The term “guarantee” used as a verb has a
corresponding meaning.

“Holder,” when used with respect to any Security, means the Person in whose name the Security
is registered in the Register.

“Indebtedness,” when used with respect to any Person, and without duplication means:

(1) all indebtedness, obligations and other liabilities (contingent or otherwise) of such
Person for borrowed money (including obligations of the Company in respect of overdrafts, foreign
exchange contracts, currency exchange agreements, Interest Rate Protection Agreements, and any
loans or advances from banks, whether or not evidenced by notes or similar instruments) or
evidenced by bonds, debentures, notes or other instruments for the payment of money, or incurred in
connection with the acquisition of any property, services or assets (whether or not the recourse of
the lender is to the whole of the assets of such Person or to only a portion thereof), other than
any account payable or other accrued current liability or obligation to trade creditors incurred in
the ordinary course of business in connection with the obtaining of materials or services;

(2) all reimbursement obligations and other liabilities (contingent or otherwise) of such
Person with respect to letters of credit, bank guarantees, bankers’ acceptances, surety bonds,
performance bonds or other guaranty of contractual performance;

(3) all obligations and liabilities (contingent or otherwise) in respect of (a) leases of such
Person required, in conformity with generally accepted accounting principles, to be accounted for
as capitalized lease obligations on the balance sheet of such Person and (b) any lease or related
documents (including a purchase agreement) in connection with the lease of real property which
provides that such Person is contractually obligated to purchase or cause a third party to purchase
the leased property and thereby guarantee a minimum residual value of the leased property to the
landlord and the obligations of such Person under such lease or related document to purchase or to
cause a third party to purchase the leased property;

(4) all obligations of such Person (contingent or otherwise) with respect to an interest rate
or other swap, cap or collar agreement or other similar instrument or agreement or foreign currency
hedge, exchange, purchase or similar instrument or agreement;

(5) all direct or indirect guaranties or similar agreements by such Person in respect of, and
obligations or liabilities (contingent or otherwise) of such Person to purchase or otherwise
acquire or otherwise assure a creditor against loss in respect of, indebtedness, obligations or
liabilities of another Person of the kind described in clauses (1) through (4);

(6) any indebtedness or other obligations described in clauses (1) through (4) secured by any
mortgage, pledge, lien or other encumbrance existing on property which is owned or held by such
Person, regardless of whether the indebtedness or other obligation secured thereby shall have been
assumed by such Person; and

(7) any and all deferrals, renewals, extensions, refinancings, replacements, restatements and
refundings of, or amendments, modifications or supplements to, any indebtedness, obligation or
liability of the kind described in clauses (1) through (6).

“Indenture” means this instrument as originally executed or as it may from time to time be
supplemented or amended by one or more indentures supplemental hereto entered into pursuant to the
applicable provisions hereof.

“Initial Purchaser” means Merrill Lynch, Pierce, Fenner & Smith Incorporated.

“Interest Payment Date” means each March 27 and September 27.

“Interest Rate” means 3.0% per annum.

“Interest Rate Protection Agreement” means, with respect to any Person, any interest rate swap
agreement, interest rate cap or collar agreement or other financial agreement or arrangement
designed to protect such Person against fluctuations in interest rates, as in effect from time to
time.

“Make-Whole Premium” has the meaning specified in Section 12.13 hereof.

“Maturity” means the date on which the principal of such Security becomes due and payable as
therein or herein provided, whether at the Stated Maturity or by acceleration, conversion, exercise
of a Repurchase Right or otherwise.

“Measurement Period” has the meaning specified in Section 12.4(d) hereof.

“Nasdaq National Market” means the National Association of Securities Dealers Automated
Quotation National Market or any successor national securities exchange or automated
over-the-counter trading market in the United States.

“Officer” of the Company means the Chief Executive Officer, the President, the Chief Financial
Officer, the Treasurer, any Vice President, the Secretary or any Assistant Secretary of the
Company.

“Officers’ Certificate” means a certificate signed by both (1) the Chief Executive Officer,
the President or a Vice President and (2) so long as not the same as the officer signing pursuant
to clause (1), the Chief Financial Officer, the Treasurer or the Secretary of the Company, and
delivered to the Trustee.

“Opinion of Counsel” means a written opinion of counsel, who may be counsel to the Company
(and may include directors or employees of the Company) and which opinion is acceptable to the
Trustee, which acceptance shall not be unreasonably withheld.

“Outstanding,” when used with respect to Securities, means, as of the date of determination,
all Securities theretofore authenticated and delivered under this Indenture, except Securities:

(1) previously canceled by the Trustee or delivered to the Trustee for cancellation;

(2) for the payment of which money in the necessary amount has been previously deposited with
the Trustee or any Paying Agent (other than the Company) in trust or set aside and segregated in
trust by the Company (if the Company shall act as its own Paying Agent) for the Holders of such
Securities, and

(3) which have been paid, in exchange for or in lieu of which other Securities have been
authenticated and delivered pursuant to this Indenture, other than any such Securities in respect
of which there shall have been presented to the Trustee proof satisfactory to it that such
Securities are held by a bona fide purchaser in whose hands such Securities are valid obligations
of the Company.

“Paying Agent” has the meaning specified in Section 2.5 hereof.

“Payment Blockage Notice” has the meaning specified in Section 13.1(d) hereof.

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

“Physical Securities” has the meaning specified in Section 2.2 hereof.

“Place of Conversion” means any city in which any Conversion Agent is located.

“Place of Payment” means any city in which any Paying Agent is located.

“Predecessor Security” of any particular Security means every previous Security evidencing all
or a portion of the same debt as that evidenced by such particular Security; and, for the purposes
of this definition, any Security authenticated and delivered under Section 2.12 hereof in exchange
for or in lieu of a mutilated, destroyed, lost or stolen Security shall be deemed to evidence the
same debt as the mutilated, destroyed, lost or stolen Security.

“Purchase Agreement” means the Purchase Agreement with respect to the Securities, dated
September 21, 2005, between the Company and the Initial Purchaser.

“Quoted Price” of the Common Stock means the last reported sale price of the Common Stock on
the Nasdaq National Market or, if the Common Stock is listed on a national securities exchange,
then on such exchange, or if the Common Stock is not quoted on Nasdaq National Market or listed on
an exchange, the average of the last bid and asked price on the National Association of Securities
Dealers Automated Quotation System.

“Record Date” means either a Regular Record Date or a Special Record Date, as the case may be,
provided that, for purposes of Section 12.4 hereof, Record Date has the meaning specified in
Section 12.4(g) hereof.

“Reference Period” has the meaning set forth in Section 12.4(d) hereof.

“Register” has the meaning specified in Section 2.5 hereof.

“Registrar” has the meaning specified in Section 2.5 hereof.

“Registration Rights Agreement” means the Registration Rights Agreement dated as of September
27, 2005 entered into by the Company and the Initial Purchaser.

“Regular Record Date” for the interest on the Securities payable means the March 12 (whether
or not a Business Day) next preceding a March 27 Interest Payment Date and the September 12
(whether or not a Business Day) next preceding a March 27 Interest Payment Date.

“Repurchase Date” has the meaning specified in Section 11.1 hereof.

“Repurchase Price” has the meaning specified in Section 11.1 hereof.

“Repurchase Right” has the meaning specified in Section 11.1 hereof.

“Responsible Officer” when used with respect to the Trustee, means any officer of the Trustee,
including any vice president, assistant vice president, secretary, assistant secretary, the
treasurer, any assistant treasurer, the managing director or any other officer of the Trustee
customarily performing functions similar to those performed by any of the above designated officers
and also means, with respect to a particular corporate trust matter, any other officer to whom such
matter is referred because of such officer’s knowledge of and familiarity with the particular
subject.

“Rights” means any common stock or preferred stock purchase right, as the case may be, that
all or substantially all shares of Common Stock are entitled to receive under a Rights Plan.

“Rights Plan” means the Company’s Second Amended and Restated Preferred Shares Rights
Agreement, dated as of August 21, 2000 between Cyberonics and BankBoston, N.A. (formerly known as
The First National Bank of Boston), including the Form of First Amended Certificate of Designation
of Rights, Preference snad Privileges of Series A Participating Preferred Stock, Form of Rights
Certificate and Stockholder Rights plan attached thereto as Exhibits A, B and C, respectively, as
amended, and any preferred shares rights plan or any similar plan adopted by the Company after the
date hereof.

“SEC” means the Securities and Exchange Commission.

“Securities” has the meaning ascribed to it in the first paragraph under the caption “Recitals
of the Company.”

“Securities Act” means the Securities Act of 1933, as amended.

“Senior Debt” means the principal of, premium, if any, interest (including all interest
accruing subsequent to the commencement of any bankruptcy or similar proceeding, whether or not a
claim for post-petition interest is allowable as a claim in any such proceeding) and rent payable
on or termination payment with respect to or in connection with, and all fees, costs, expenses and
other amounts accrued or due on or in connection with, Indebtedness of the Company, whether
outstanding on the date of this Indenture or thereafter created, incurred, assumed, guaranteed or
in effect guaranteed by the Company (including all deferrals, renewals, extensions or refundings
of, or amendments, modifications or supplements to, the foregoing), except for (a) any particular
Indebtedness in respect of which the instrument creating or evidencing the same or the assumption
or guarantee thereof expressly provides that such Indebtedness shall not be senior in right of
payment to the Securities or expressly provides that such Indebtedness is pari passu or junior to
the Securities and (b) any Indebtedness between or among the Company and/or any of its
subsidiaries, or any of the Company’s Affiliates. The term “Senior Debt” shall include, without
limitation, all Designated Senior Debt.

“Significant Subsidiary” means any Subsidiary which is a “significant subsidiary” within the
meaning of Rule 405 under the Securities Act.

“Special Record Date” for the payment of any Defaulted Interest means a date fixed by the
Trustee pursuant to Section 2.17 hereof.

“Spin-off” has the meaning specified in Section 12.4(d) hereof.

“Stated Maturity” means the date specified in any Security as the fixed date for the payment
of principal on such Security or on which an installment of interest on such Security is due and
payable.

“Stock Price” means (i) in connection with a Fundamental Change in which the Holders receive
only cash, the amount of cash paid per share of Common Stock in connection with the Fundamental
Change, and (ii) in all other cases means the average of the Closing Price of the Common Stock for
the shorter of (A) 20 Trading Days ending on the Trading Day immediately preceding the Fundamental
Change Effective Date for such Fundamental Change, or (B) all of the Trading Days from the Trading
Day after the Company gives notice of the anticipated Fundamental Change Effective Date up to but
not including the Fundamental Change Effective date.

“Subsidiary” means a corporation more than 50% of the outstanding voting stock of which is
owned, directly or indirectly, by the Company or by one or more other Subsidiaries, or by the
Company and one or more other Subsidiaries. For the purposes of this definition only, “voting
stock” means stock which ordinarily has voting power for the election of directors, whether at all
times or only so long as no senior class of stock has such voting power by reason of any
contingency.

“Termination of Trading” means the occurrence of the Common Stock or any other common stock
into which the Securities are then convertible being neither listed for trading on a United States
national securities exchange nor approved for listing on Nasdaq National Market or any similar
United States system of automated dissemination of quotations of securities prices or traded in
over-the-counter securities markets, and no American Depositary Shares or similar instruments for
such common stock are so listed or approved for listing in the United States.

“TIA” means the Trust Indenture Act of 1939 (15 U.S. Code §§ 77aaa-77bbbb), as in effect on
the date of this Indenture; provided, however, that in the event the TIA is amended after such
date, “TIA” means, to the extent required by such amendment, the Trust Indenture Act of 1939, as so
amended, or any successor statute.

“Trading Day” means a day during which trading in securities generally occurs on The New York
Stock Exchange or, if the Common Stock is not then listed on The New York Stock Exchange, on the
principal other national or regional securities exchange on which the Common Stock is then listed
or, if the Common Stock is not then listed on a national or regional securities exchange, on the
Nasdaq National Market or, if the Common Stock is not then quoted on the Nasdaq National Market, on
the principal other market on which the Common Stock is traded.

“Transfer Agent” means any Person, which may be the Company, authorized by the Company to
exchange or register the transfer of Securities.

“Trigger Event” has the meaning specified in Section 12.4(d) hereof.

“Trustee” means the Person named as the “Trustee” in the first paragraph of this instrument
until a successor Trustee shall have become such pursuant to the applicable provisions of this
Indenture, and thereafter “Trustee” shall mean such successor Trustee.

“U.S. Government Obligations” means: (1) direct obligations of the United States of America
for the payment of which the full faith and credit of the United States of America is pledged or
(2) obligations of a Person controlled or supervised by and acting as an agency or instrumentality
of the United States of America, the payment of which is unconditionally guaranteed as a full faith
and credit obligation by the United States of America and which, in either case, are non-callable
at the option of the issuer thereof.

“Vice President” when used with respect to the Company, means any vice president, whether or
not designated by a number or a word or words added before or after the title “vice president.”

SECTION 1.2. Incorporation by Reference of Trust Indenture Act. Whenever this
Indenture refers to a provision of the TIA, the provision is incorporated by reference in and made
a part of this Indenture.

The following TIA terms used in this Indenture have the following meanings:

(i) “indenture securities” means the Securities;

	 	 	 
	(ii)

(iii)

(iv)

	 	“indenture security holder” means a Holder;

“indenture to be qualified” means this Indenture;

“indenture trustee” or “institutional trustee” means the Trustee; and

(v) “obligor” on the Securities means the Company and any other obligor on the indenture
securities.

All other TIA terms used in this Indenture that are defined by the TIA, defined by TIA
reference to another statute or defined by SEC rule have the meanings assigned to them by such
definitions.

SECTION 1.3. Rules of Construction. For all purposes of this Indenture, except as
otherwise expressly provided or unless the context otherwise requires:

(1) the terms defined in this Article have the meanings assigned to them in this Article and
include the plural as well as the singular;

(2) all accounting terms not otherwise defined herein have the meanings assigned to them in
accordance with accounting principles generally accepted in the United States prevailing at the
time of any relevant computation hereunder; and

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

ARTICLE 2

THE SECURITIES

SECTION 2.1. Title and Terms. The Securities shall be known and designated as the
“3.0% Senior Subordinated Convertible Notes due 2012” of the Company. The aggregate principal
amount of Securities which may be authenticated and delivered under this Indenture is limited to
$125,000,000 (or $143,750,000 if the option set forth in Section 2(b) of the Purchase Agreement is
exercised in full), except for securities authenticated and delivered upon registration of,
transfer of, or in exchange for, or in lieu of other Securities pursuant to Section 2.7, 2.8, 2.12,
7.5, 11.1 or 12.2 hereof. The Securities shall be issuable in denominations of $1,000 or integral
multiples thereof.

The Securities shall mature on September 27, 2012.

Interest shall accrue from September 27 at the Interest Rate until the principal thereof is
paid or made available for payment. Interest shall be payable semiannually in arrears on March 27
and September 27 of each year, commencing March 27, 2006.

Interest on the Securities shall be computed on the basis of a 360-day year of twelve 30-day
months, and for any period shorter than a full semiannual period for which interest is calculated,
on the basis of a 30-day month, and for such periods of less than a month, the actual number of
days elapsed over a 30-day month.

A Holder of any Security at the close of business on a Regular Record Date shall be entitled
to receive interest on such Security on the corresponding Interest Payment Date. If the Company is
required by law to withhold any taxes with respect to a deemed distribution to a Holder resulting
from a Conversion Rate adjustment, such taxes may be withheld from interest payments made to such
Holder on or after the date of such Conversion Price adjustment.

A Holder of any Security which is converted after the close of business on a Regular Record
Date and prior to the corresponding Interest Payment Date (other than any Security whose Maturity
is prior to such Interest Payment Date) shall be entitled to receive interest on the principal
amount of such Security on such Interest Payment Date, notwithstanding the conversion of such
Security prior to such Interest Payment Date. However, any such Holder which surrenders any such
Security for conversion during the period between the close of business on such Regular Record Date
and ending with the opening of business on the corresponding Interest Payment Date shall be
required to pay the Company an amount equal to the interest on the principal amount of such
Security so converted (but excluding any overdue interest on the principal amount of such Security
so converted that exists at the time such Holder surrenders such Security for conversion), which is
payable by the Company to such Holder on such Interest Payment Date, at the time such Holder
surrenders such Security for conversion. Notwithstanding the foregoing, any such Holder which
surrenders for conversion any Security with respect to which the Company has specified a Repurchase
Date that is after such Regular Record Date and on or prior to the next succeeding Interest Payment
Date shall be entitled to receive (and retain) such interest and need not pay the Company an amount
equal to the interest on the principal amount of such Security so converted at the time such Holder
surrenders such Security for conversion.

Principal of, and premium, if any, and interest on, Global Securities shall be payable to the
Depositary in immediately available funds.

Principal and premium, if any, on Physical Securities shall be payable at the office or agency
of the Company maintained for such purpose, initially the Corporate Trust Office of the Trustee.
Interest on Physical Securities will be payable by (i) U.S. Dollar check drawn on a bank located in
the city where the Corporate Trust Office of the Trustee is located mailed to the address of the
Person entitled thereto as such address shall appear in the Register, or (ii) upon application to
the Registrar not later than the relevant Record Date by a Holder of an aggregate principal amount
in excess of $5,000,000, wire transfer in immediately available funds.

The Securities shall have the repurchase rights exercisable at the option of Holders as
provided in Article 11 hereof.

The Securities shall be convertible as provided in Article 12 hereof.

The Securities shall be subordinated in right of payment to Senior Debt of the Company as
provided in Article 13 hereof.

SECTION 2.2. Form of Securities. The Securities and the Trustee’s certificate of
authentication to be borne by such Securities shall be substantially in the form annexed hereto as
Exhibit A, which is incorporated in and made a part of this Indenture. The terms and
provisions contained in the form of Security shall constitute, and are hereby expressly made, a
part of this Indenture and to the extent applicable, the Company and the Trustee, by their
execution and delivery of this Indenture, expressly agree to such terms and provisions and to be
bound thereby.

Any of the Securities may have such letters, numbers or other marks of identification and such
notations, legends and endorsements as the Officers executing the same may approve (execution
thereof to be conclusive evidence of such approval) and as are not inconsistent with the provisions
of this Indenture, or as may be required to comply with any law or with any rule or regulation made
pursuant thereto or with any rule or regulation of any securities exchange or automated quotation
system on which the Securities may be listed or designated for issuance, or to conform to usage.

The Securities shall be issued initially only in the form of one or more permanent Global
Securities (each, a “Global Security”) in registered form without interest coupons. The Global
Securities shall be:

(1) duly executed by the Company and authenticated by the Trustee as hereinafter provided;

(2) registered in the name of the Depositary (or its nominee) for credit to the respective
accounts of the Holders at the Depositary; and

(3) deposited with the Trustee, as custodian for the Depositary.

The Global Securities shall be substantially in the form of Security set forth in Exhibit
A annexed hereto (including the text and schedule called for by footnotes 1 and 2 thereto).
The aggregate principal amount of the Global Securities may from time to time be increased or
decreased by adjustments made on the records of the Trustee, as custodian for the Depositary (or
its nominee), in accordance with the instructions given by the Holder thereof, as hereinafter
provided.

Securities issued in exchange for interests in the Global Securities pursuant to Section
2.8(d) hereof shall be issued in the form of permanent definitive Securities (the “Physical
Securities”) in registered form without interest coupons. The Physical Securities shall be
substantially in the form set forth in Exhibit A annexed hereto.

The Securities shall be typed, printed, lithographed or engraved or produced by any
combination of these methods or may be produced in any other manner permitted by the rules of any
securities exchange on which the Securities may be listed, all as determined by the Officers
executing such Securities, as evidenced by their execution of such Securities.

SECTION 2.3. Legend. Each Global Security shall bear the following legend on the face
thereof:

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY
TRUST COMPANY (“DTC”) TO CYBERONICS, INC. (OR ITS SUCCESSOR) OR ITS AGENT FOR REGISTRATION
OF TRANSFER, EXCHANGE, CONVERSION OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN
THE NAME OF CEDE & CO. OR OF SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC (AND ANY PAYMENT HEREON 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 SINCE THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

THE NOTES AND THE SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF THIS NOTE HAVE NOT
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE ‘‘SECURITIES ACT’’), OR
ANY STATE SECURITIES LAWS. NEITHER THIS NOTE, THE SHARES OF COMMON STOCK ISSUABLE UPON
CONVERSION OF THIS NOTE NOR ANY INTEREST OR PARTICIPATION HEREIN OR THEREIN MAY BE
REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE DISPOSED OF IN THE
ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO,
REGISTRATION.

BY ITS ACQUISITION HEREOF, THE HOLDER (1) AGREES TO OFFER, SELL OR OTHERWISE TRANSFER
SUCH NOTE PRIOR TO THE DATE WHICH IS TWO YEARS AFTER THE LATER OF THE ORIGINAL ISSUE DATE
HEREOF AND THE LAST DATE ON WHICH THE COMPANY OR ANY AFFILIATE OF THE COMPANY WAS THE OWNER
OF THIS NOTE (OR ANY PREDECESSOR OF THIS NOTE) ONLY (A) TO THE COMPANY OR ANY SUBSIDIARY
THEREOF, (B) PURSUANT TO A REGISTRATION STATEMENT WHICH HAS BEEN DECLARED EFFECTIVE UNDER
THE SECURITIES ACT, (C) FOR SO LONG AS THE NOTES ARE ELIGIBLE FOR RESALE PURSUANT TO RULE
144A , TO A PERSON IT REASONABLY BELIEVES IS A ‘‘QUALIFIED INSTITUTIONAL BUYER’’ AS DEFINED
IN RULE 144A THAT PURCHASES FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED
INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON
RULE 144A, (D) PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF
THE SECURITIES ACT, SUBJECT TO THE COMPANY’S AND THE TRUSTEE’S RIGHT PRIOR TO ANY SUCH
OFFER, SALE OR TRANSFER PURSUANT TO CLAUSE (D) TO REQUIRE THE DELIVERY OF AN OPINION OF
COUNSEL, CERTIFICATION AND/OR OTHER INFORMATION SATISFACTORY TO EACH OF THEM, AND IN EACH OF
THE FOREGOING CASES, TO REQUIRE THAT A CERTIFICATE OF TRANSFER IN THE FORM APPEARING ON THE
OTHER SIDE OF THIS NOTE IS COMPLETED AND DELIVERED BY THE TRANSFEROR TO THE TRUSTEE. THIS
LEGEND WILL BE REMOVED UPON THE REQUEST OF THE HOLDER AFTER THE RESALE RESTRICTION
TERMINATION DATE.

SECTION 2.4. Execution, Authentication, Delivery and Dating. Two Officers shall
execute the Securities on behalf of the Company by manual or facsimile signature. If an Officer
whose signature is on a Security no longer holds that office at the time the Security is
authenticated, the Security shall be valid nevertheless.

At any time and from time to time after the execution and delivery of this Indenture, the
Company may deliver Securities executed by the Company to the Trustee for authentication, together
with a Company Order for the authentication and delivery of such Securities, and the Trustee in
accordance with such Company Order shall authenticate and deliver such Securities as in this
Indenture provided and not otherwise.

Each Security shall be dated the date of its authentication.

No Security shall be entitled to any benefit under this Indenture, or be valid or obligatory
for any purpose, unless there appears on such Security a certificate of authentication
substantially in the form provided for herein executed by or on behalf of the Trustee by manual
signature, and such certificate upon any Security shall be conclusive evidence, and the only
evidence, that such Security has been duly authenticated and delivered hereunder.

The Trustee may appoint an authenticating agent or agents reasonably acceptable to the Company
with respect to the Securities. Unless limited by the terms of such appointment, an authenticating
agent may authenticate Securities whenever the Trustee may do so. Each reference in this Indenture
to authentication by the Trustee includes authentication by such agent.

SECTION 2.5. Registrar and Paying Agent. The Company shall maintain an office or
agency where Securities may be presented for registration of transfer or for exchange (the
“Registrar”) and an office or agency where Securities may be presented for payment (the “Paying
Agent”). The Registrar shall keep a register of the Securities (the “Register”) and of their
transfer and exchange. The Company may appoint one or more co-Registrars and one or more
additional Paying Agents for the Securities. The term “Paying Agent” includes any additional
paying agent and the term “Registrar” includes any additional registrar. The Company may change
any Paying Agent or Registrar without prior notice to any Holder.

The Company will cause each Paying Agent (other than the Trustee) 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, that such Paying Agent will:

(1) hold all sums held by it for the payment of the principal of and premium, if any, or
interest on Securities in trust for the benefit of the Persons entitled thereto until such sums
shall be paid to such Persons or otherwise disposed of as provided in this Indenture;

(2) give the Trustee notice of any Default by the Company in the making of any payment of
principal and premium, if any, or interest; and

(3) at any time during the continuance of any such Default, upon the written request of the
Trustee, forthwith pay to the Trustee all sums so held in trust by such Paying Agent.

The Company shall give prompt written notice to the Trustee of the name and address of any
Agent who is not a party to this Indenture. If the Company fails to appoint or maintain another
entity as Registrar or Paying Agent, the Trustee shall act as such. The Company or any Affiliate
of the Company may act as Paying Agent or Registrar; provided, however, that none of the Company,
its Subsidiaries or the Affiliates of the foregoing shall act:

(i) as Paying Agent in connection with offers to purchase and discharges, as otherwise
specified in this Indenture, and

(ii) as Paying Agent or Registrar if a Default or Event of Default has occurred and is
continuing.

The Company hereby initially appoints the Trustee as Registrar and Paying Agent for the
Securities.

SECTION 2.6. Paying Agent to Hold Assets in Trust. Not later than 10:00 a.m. (New
York City time) on each due date of the principal, premium, if any, and interest on any Securities,
the Company shall deposit with one or more Paying Agents money in immediately available funds
sufficient to pay such principal, premium, if any, and interest so becoming due. The Company at
any time may require a Paying Agent to pay all money held by it to the Trustee. Upon payment over
to the Trustee, the Paying Agent (if other than the Company) shall have no further liability for
the money so paid over to the Trustee.

If the Company shall act as a Paying Agent, it shall, prior to or on each due date of the
principal of and premium, if any, or interest on any of the Securities, segregate and hold in trust
for the benefit of the Holders a sum sufficient with monies held by all other Paying Agents, to pay
the principal and premium, if any, or interest so becoming due until such sums shall be paid to
such Persons or otherwise disposed of as provided in this Indenture, and shall promptly notify the
Trustee of its action or failure to act.

SECTION 2.7. General Provisions Relating to Transfer and Exchange. The Securities are
issuable only in registered form. A Holder may transfer a Security only by written application to
the Registrar stating the name of the proposed transferee and otherwise complying with the terms of
this Indenture. No such transfer shall be effected until, and such transferee shall succeed to the
rights of a Holder only upon, final acceptance and registration of the transfer by the Registrar in
the Register. Furthermore, any Holder of a Global Security shall, by acceptance of such Global
Security, agree that transfers of beneficial interests in such Global Security may be effected only
through a book-entry system maintained by the Holder of such Global Security (or its agent) and
that ownership of a beneficial interest in the Security shall be required to be reflected in a
book-entry.

When Securities are presented to the Registrar with a request to register the transfer or to
exchange them for an equal aggregate principal amount of Securities of other authorized
denominations, the Registrar shall register the transfer or make the exchange as requested if its
requirements for such transactions are met (including that such Securities are duly endorsed or
accompanied by a written instrument of transfer duly executed by the Holder thereof or by an
attorney who is authorized in writing to act on behalf of the Holder). Subject to Section 2.4
hereof, to permit registrations of transfers and exchanges, the Company shall execute and the
Trustee shall authenticate Securities at the Registrar’s request. No service charge shall be made
for any registration of transfer or exchange of the Securities, but the Company may require payment
of a sum sufficient to cover any transfer tax or similar governmental charge payable in connection
therewith (other than any such transfer taxes or other similar governmental charge payable upon
exchanges pursuant to Section 2.14, 7.5 or 10.7 hereof).

(1) Neither the Company nor the Registrar shall be required to exchange or register a transfer
of any Securities surrendered for conversion or, if a portion of any Security is surrendered for
conversion, such portion thereof surrendered for conversion.

SECTION 2.8. Book-Entry Provisions for the Global Securities.

(a) The Global Securities initially shall

(i) be registered in the name of the Depositary (or a nominee thereof);

(ii) be delivered to the Trustee as custodian for such Depositary; and

(iii) bear the legend as set forth in Section 2.3 hereof.

Members of, or participants in, the Depositary (“DTC Participants”) shall have no rights under
this Indenture with respect to any Global Security held on their behalf by the Depositary, or the
Trustee as its custodian, or under such Global Security, and the Depositary may be treated by the
Company, the Trustee and any agent of the Company or the Trustee as the absolute owner of such
Global Security for all purposes whatsoever. Notwithstanding the foregoing, nothing contained
herein shall prevent the Company, the Trustee or any agent of the Company or Trustee from giving
effect to any written certification, proxy or other authorization furnished by the Depositary or
impair, as between the Depositary and the DTC Participants, the operation of customary practices
governing the exercise of the rights of a Holder of any Security.

(b) The registered Holder of a Global Security may grant proxies and otherwise authorize any
Person, including DTC Participants and Persons that may hold interests through DTC Participants, to
take any action which a Holder is entitled to take under this Indenture or the Securities.

(c) A Global Security may not be transferred, in whole or in part, to any Person other than
the Depositary (or a nominee thereof), and no such transfer to any such other Person may be
registered. Beneficial interests in a Global Security may be transferred in accordance with the
rules and procedures of the Depositary and the provisions of Section 2.9 hereof.

(d) If at any time:

(i) the Depositary notifies the Company in writing that it is no longer willing or able to
continue to act as Depositary for the Global Securities, or the Depositary ceases to be a “clearing
agency” registered under the Exchange Act, and a successor depositary for the Global Securities is
not appointed by the Company within 90 days of such notice or cessation;

(ii) the Company, at its option, notifies the Trustee in writing that it elects to cause the
issuance of the Securities in definitive form under this Indenture in exchange for all or any part
of the Securities represented by a Global Security or Global Securities; or

(iii) an Event of Default has occurred and is continuing and the Registrar has received a
request from the Depositary for the issuance of Physical Securities in exchange for such Global
Security or Global Securities,

the Depositary shall surrender such Global Security or Global Securities to the Trustee for
cancellation and the Company shall execute, and the Trustee, upon receipt of an Officers’
Certificate and Company Order for the authentication and delivery of Securities, shall authenticate
and deliver in exchange for such Global Security or Global Securities, Physical Securities of like
tenor as that of the Global Securities in an aggregate principal amount equal to the aggregate
principal amount of such Global Security or Global Securities. Such Physical Securities shall be
registered in such names as the Depositary shall identify in writing as the beneficial owners of
the Securities represented by such Global Security or Global Securities (or any nominees thereof).

Notwithstanding the foregoing, in connection with any transfer of beneficial interests in a
Global Security to beneficial owners pursuant to Section 2.8(d) hereof, the Registrar shall reflect
on its books and records the date and a decrease in the principal amount of such Global Security in
an amount equal to the principal amount of the beneficial interest in such Global Security to be
transferred.

SECTION 2.9. [Reserved].

SECTION 2.10. Holder Lists. The Trustee shall preserve in as current a form as is
reasonably practicable the most recent list available to it of the names and addresses of Holders
and shall otherwise comply with Section 312(a) of the TIA. If the Trustee is not the Registrar,
the Company shall furnish to the Trustee prior to or on each Interest Payment Date and at such
other times as the Trustee may request in writing a list in such form and as of such date as the
Trustee may reasonably require of the names and addresses of Holders relating to such Interest
Payment Date or request, as the case may be.

SECTION 2.11. Persons Deemed Owners. The Company, the Trustee and any agent of the
Company or the Trustee may treat the registered Holder of a Global Security as the absolute owner
of such Global Security for the purpose of receiving payment thereof or on account thereof and for
all other purposes whatsoever, whether or not such Security be overdue, and notwithstanding any
notice of ownership or writing thereon, or any notice of previous loss or theft or other interest
therein. The Company, the Trustee and any agent of the Company or the Trustee may treat the Person
in whose name any Security is registered as the owner of such Security for the purpose of receiving
payment of principal of and premium, if any, and interest on such Security and for all other
purposes whatsoever, whether or not such Security be overdue, and notwithstanding any notice of
ownership or writing thereon, or any notice of previous loss or theft or other interest therein.

SECTION 2.12. Mutilated, Destroyed, Lost or Stolen Securities. If any mutilated
Security is surrendered to the Trustee, the Company shall execute and the Trustee shall
authenticate and deliver in exchange therefor a new Security of like tenor and principal amount and
bearing a number not contemporaneously outstanding.

If there is delivered to the Company and the Trustee

(1) evidence to their satisfaction of the destruction, loss or theft of any Security, and

(2) such security or indemnity as may be required by them to save each of them and any agent
of either of them harmless,

then, in the absence of notice to the Company or the Trustee that such Security has been
acquired by a bona fide purchaser, the Company shall execute and, upon request, the Trustee shall
authenticate and deliver, in lieu of any such destroyed, lost or stolen Security, a new Security of
like tenor and principal amount and bearing a number not contemporaneously outstanding.

In case any such mutilated, destroyed, lost or stolen Security has become or is about to
become due and payable, the Company in its discretion, but subject to any conversion rights, may,
instead of issuing a new Security, pay such Security, upon satisfaction of the condition set forth
in the preceding paragraph.

Upon the issuance of any new Security under this Section, the Company may require the payment
of a sum sufficient to cover any tax or other governmental charge that may be imposed in relation
thereto and any other expenses (including the fees and expenses of the Trustee) connected
therewith.

Every new Security issued pursuant to this Section in lieu of any destroyed, lost or stolen
Security shall constitute an original additional contractual obligation of the Company, whether or
not the destroyed, lost or stolen Security shall be at any time enforceable by anyone, and such new
Security shall be entitled to all the benefits of this Indenture equally and proportionately with
any and all other Securities duly issued hereunder.

The provisions of this Section are exclusive and shall preclude (to the extent lawful) all
other rights and remedies with respect to the replacement or payment of mutilated, destroyed, lost
or stolen Securities.

SECTION 2.13. Treasury Securities. In determining whether the Holders of the
requisite principal amount of Outstanding Securities are present at a meeting of Holders for quorum
purposes or have given any request, demand, authorization, direction, notice, consent or waiver
hereunder, Securities owned by the Company or any Affiliate of the Company shall be disregarded and
deemed not to be Outstanding, except that, in determining whether the Trustee shall be protected in
relying upon any such determination as to the presence of a quorum or upon any such request,
demand, authorization, direction, notice, consent or waiver, only such Securities of which the
Trustee has received written notice and are so owned shall be so disregarded.

SECTION 2.14. Temporary Securities. Pending the preparation of Securities in
definitive form, the Company may execute and the Trustee shall, upon written request of the
Company, authenticate and deliver temporary Securities (printed or lithographed). Temporary
Securities shall be issuable in any authorized denomination, and substantially in the form of the
Securities in definitive form but with such omissions, insertions and variations as may be
appropriate for temporary Securities, all as may be determined by the Company. Every such
temporary Security shall be executed by the Company and authenticated by the Trustee upon the same
conditions and in substantially the same manner, and with the same effect, as the Securities in
definitive form. Without unreasonable delay, the Company will execute and deliver to the Trustee
Securities in definitive form (other than in the case of Securities in global form) and thereupon
any or all temporary Securities (other than any such Securities in global form) may be surrendered
in exchange therefor, at each office or agency maintained by the Company pursuant to Section 9.2
and the Trustee shall authenticate and deliver in exchange for such temporary Securities an equal
aggregate principal amount of Securities in definitive form. Such exchange shall be made by the
Company at its own expense and without any charge therefor. Until so exchanged, the temporary
Securities shall in all respects be entitled to the same benefits and subject to the same
limitations under this Indenture as Securities in definitive form authenticated and delivered
hereunder.

SECTION 2.15. Cancellation. All securities surrendered for payment, redemption,
repurchase, conversion, registration of transfer or exchange shall, if surrendered to any Person
other than the Trustee, be delivered to the Trustee. All Securities so delivered shall be canceled
promptly by the Trustee, and no Securities shall be issued in lieu thereof except as expressly
permitted by any of the provisions of this Indenture. Upon written instructions of the Company,
the Trustee shall dispose of the Securities in accordance with its usual and customary policies and
procedures and, thereafter, shall deliver a certificate of such cancellation to the Company. If
the Company shall acquire any of the Securities, such acquisition shall not operate as a redemption
or satisfaction of the indebtedness represented by such Securities unless the same are delivered to
the Trustee for cancellation.

SECTION 2.16. CUSIP Numbers. The Company in issuing the Securities may use “CUSIP”
numbers (if then generally in use), and the Trustee shall use CUSIP numbers in notices of
redemption or exchange as a convenience to Holders; provided, however, that any such notice shall
state that no representation is made as to the correctness of such numbers either as printed on the
Securities or as contained in any such notice and that reliance may be placed only on the other
identification numbers printed on the Securities, and any such redemption shall not be affected by
any defect in or omission of such numbers. The Company shall promptly notify the Trustee of any
change in the CUSIP numbers.

SECTION 2.17. Defaulted Interest. If the Company fails to make a payment of interest
on any Security when due and payable (“Defaulted Interest”), it shall pay such Defaulted Interest
plus (to the extent lawful) any interest payable on the Defaulted Interest, in any lawful manner.
It may elect to pay such Defaulted Interest, plus any such interest payable on it, to the Persons
who are Holders of such Securities on which the interest is due on a subsequent Special Record
Date. The Company shall notify the Trustee in writing of the amount of Defaulted Interest proposed
to be paid on each such Security. The Company shall fix any such Special Record Date and payment
date for such payment. At least 15 days before any such Special Record Date, the Company shall
mail to Holders affected thereby a notice that states the Special Record Date, the Interest Payment
Date, and amount of such interest to be paid.

SECTION 2.18. Registration Default. The Additional Interest Amount shall be payable upon
the Securities in the case of a Registration Default (as defined in the Registration Rights
Agreement). If a Registration Default occurs, the Company shall deliver to the Trustee an
Officers’ Certificate stating (1) the Additional Interest Amount payable, (2) when such Additional
Interest Amount began accruing and (3) when such Additional Interest Amount is payable. Unless and
until a Responsible Officer of the Trustee receives such an Officers’ Certificate, the Trustee
shall assume that no Additional Interest Amount is payable.

ARTICLE 3

SATISFACTION AND DISCHARGE

SECTION 3.1. Satisfaction and Discharge of Indenture. When:

(1) The Company shall deliver to the Trustee for cancellation all Securities previously
authenticated (other than any Securities which have been destroyed, lost or stolen and in lieu of
or in substitution for which other Securities shall have been authenticated and delivered) and not
previously canceled, or

(2) (A) All the securities not previously canceled or delivered to the Trustee for
cancellation shall have become due and payable, or are by their terms to become due and payable
within one year,

	 	(B)	 	The Company shall deposit with the Trustee, in trust, cash in U.S. dollars and/or U.S.
Government Obligations which through the payment of interest and principal in respect thereof,
in accordance with their terms, will provide (and without reinvestment and assuming no tax
liability will be imposed on the Trustee), not later than one day before the due date of any
payment of money, an amount in cash, sufficient, in the opinion of a nationally recognized
firm of independent public accountants expressed in a written certification thereof delivered
to the Trustee, to pay principal of, premium, if any, or interest on all of the Securities
(other than any Securities which shall have been mutilated, destroyed, lost or stolen and in
lieu of or in substitution for which other Securities shall have been authenticated and
delivered) not previously canceled or delivered to the Trustee for cancellation, on the dates
such payments of principal, premium, if any, or interest are due to such date of maturity, and

	 	(C)	 	The Company shall have delivered to the Trustee an Officers’ Certificate and an Opinion of
Counsel to the effect that (x) the Company has received from, or there has been published by,
the Internal Revenue Service a ruling or (y) since the date of execution of this Indenture,
there has been a change in the applicable federal income tax law, in the case of either clause
(x) or (y) to the effect that, and based thereon such Opinion of Counsel shall confirm that,
the Holders will not recognize income, gain or loss for federal income tax purposes as a
result of such deposit and discharge and will be subject to federal income tax on the same
amount and in the same manner and at the same times as would have been the case if such
deposit and discharge had not occurred,

and if, in the case of either clause (1) or (2), the Company shall also pay or cause to be
paid all other sums payable hereunder by the Company, then this Indenture shall cease to be of
further effect (except as to: (i) remaining rights of registration of transfer, substitution and
exchange and conversion of Securities, (ii) rights hereunder of Holders to receive payments of
principal of and premium, if any, and interest on the Securities 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 (iii) the rights, obligations and immunities of the Trustee hereunder), and
the Trustee, on demand of the Company accompanied by an Officers’ Certificate and an Opinion of
Counsel and at the cost and expense of the Company, shall execute proper instruments acknowledging
satisfaction of and discharging this Indenture; provided, however, that the Company shall reimburse
the Trustee for all amounts due the Trustee under Section 5.8 hereof and for any costs or expenses
thereafter reasonably and properly incurred by the Trustee and to compensate the Trustee for any
services thereafter reasonably and properly rendered by the Trustee in connection with this
Indenture or the Securities.

SECTION 3.2. Deposited Monies To Be Held in Trust. Subject to Section 3.3 hereof, all
monies deposited with the Trustee pursuant to Section 3.1 hereof shall be held in trust and applied
by it to the payment, notwithstanding the provisions of Article 13 hereof, either directly or
through any Paying Agent (including the Company if acting as its own Paying Agent), to the Holders
of the particular Securities for the payment of which such monies have been deposited with the
Trustee, of all sums due and to become due thereon for principal, premium, if any, and interest.
All monies deposited with the Trustee pursuant to Section 3.1 hereof (and held by it or any Paying
Agent) for the payment of Securities subsequently converted shall be returned to the Company upon
request of the Company.

SECTION 3.3. Return of Unclaimed Monies. The Trustee and the Paying Agent shall pay
to the Company any money held by them for the payment of principal or premium, if any, or interest
that remains unclaimed for two years after the date upon which such payment shall have become due.
After payment to the Company, Holders entitled to the money must look to the Company for payment as
general creditors unless an applicable abandoned property law designates another Person, and all
liability of the Trustee and the Paying Agent with respect to such money shall cease.

ARTICLE 4

DEFAULTS AND REMEDIES

SECTION 4.1. Events of Default. An “Event of Default” with respect to the Securities
occurs when any of the following occurs (whatever the reason for such Event of Default and whether
it shall be occasioned by the provisions of Article 13 hereof or 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):

(a) the Company defaults in the payment of the principal of or premium, if any, on any of the
Securities when it becomes due and payable, at Maturity or exercise of a Repurchase Right or
otherwise, whether or not such payment is prohibited by Article 13 hereof; or

(b) the Company defaults in the payment of interest (including without limitation, Additional
Interest Amounts, if any) on any of the Securities when it becomes due and payable and such default
continues for a period of 30 days, whether or not such payment is prohibited by Article 13 hereof;
or

(c) the Company fails to deliver shares of Common Stock, together with cash instead of
fractional shares, when those shares of Common Stock or cash instead of fractional shares is
required to be delivered following conversion of a Security in accordance with Article 12, and that
failure continues for 10 days; or

(d) the Company fails to perform or observe any other term, covenant or agreement contained in
the Securities or this Indenture and the failure continues for a period of 60 days after written
notice of such failure, requiring the Company to remedy the same, shall have been given to the
Company by the Trustee or to the Company and the Trustee by the Holders of at least 25% in
aggregate principal amount of the Outstanding Securities; or

(e) (i) the Company fails to make any payment by the end of the applicable grace period, if
any, after the maturity of any Indebtedness for borrowed money in an amount in excess of
$25,000,000 or (ii) there is an acceleration of any Indebtedness for borrowed money in an amount in
excess of $25,000,000 because of a default with respect to such Indebtedness without such
Indebtedness having been discharged or such acceleration having been cured, waived, rescinded or
annulled, in the case of either (i) or (ii) above, for a period of 30 days after written notice to
the Company by the Trustee or to the Company and the Trustee by Holders of at least 25% in
aggregate principal amount of the Outstanding Securities; or

(f) the Company fails to provide the Company Notice in accordance with the terms of Section
11.3(a) hereof; or

(g) the entry by a court having jurisdiction in the premises of (i) a decree or order for
relief in respect of the Company in an involuntary case or proceeding under any applicable U.S.
federal or state bankruptcy, insolvency, reorganization or other similar law or (ii) a decree or
order adjudging the Company a bankrupt or insolvent, or approving as properly filed a petition
seeking reorganization, arrangement, adjustment or composition of or in respect of the Company
under any applicable U.S. federal or state law, or appointing a custodian, receiver, liquidator,
assignee, trustee, sequestrator or other similar official of the Company or of any substantial part
of its property, or ordering the winding up or liquidation of its affairs, and the continuance of
any such decree or order for relief or any such other decree or order unstayed and in effect for a
period of 60 consecutive days; or

(h) the commencement by the Company of a voluntary case or proceeding under any applicable
U.S. federal or state bankruptcy, insolvency, reorganization or other similar law or of any other
case or proceeding to be adjudicated a bankrupt or insolvent, or the consent by the Company to the
entry of a decree or order for relief in respect of the Company in an involuntary case or
proceeding under any applicable U.S. federal or state bankruptcy, insolvency, reorganization or
other similar law or to the commencement of any bankruptcy or insolvency case or proceeding against
the Company, or the filing by the Company of a petition or answer or consent seeking reorganization
or relief under any applicable U.S. federal or state law, or the consent by the Company to the
filing of such petition or to the appointment of or the taking possession by a custodian, receiver,
liquidator, assignee, trustee, sequestrator or other similar official of the Company; or of any
substantial part of its property, or the making by the Company of an assignment for the benefit of
creditors, or the admission by the Company in writing of its inability to pay its debts generally
as they become due, or the taking of corporate action by the Company expressly in furtherance of
any such action.

SECTION 4.2. Acceleration of Maturity; Rescission and Annulment. If an Event of
Default with respect to Outstanding Securities (other than an Event of Default specified in Section
4.1(g) or 4.1(h) hereof) occurs and is continuing, the Trustee or the Holders of at least 25% in
aggregate principal amount of the Outstanding Securities, by written notice to the Company and the
Trustee, may declare due and payable 100% of the principal amount of all Outstanding Securities
plus any accrued and unpaid interest to the date of payment. Upon a declaration of acceleration,
such principal and accrued and unpaid interest to the date of payment shall be immediately due and
payable.

If an Event of Default specified in Section 4.1(g) or 4.1(h) hereof occurs, all unpaid
principal of and accrued and unpaid interest on the Outstanding Securities shall become and be
immediately due and payable, without any declaration or other act on the part of the Trustee or any
Holder.

The Holders of a majority in aggregate principal amount of the Outstanding Securities by
written notice to the Trustee may rescind and annul an acceleration and its consequences if:

(1) all existing Events of Default, other than the nonpayment of principal of or interest on
the Securities which has become due solely because of the acceleration, have been remedied, cured
or waived, and

(2) the rescission would not conflict with any judgment or decree of a court of competent
jurisdiction;

provided, however, that in the event such declaration of acceleration has been made based on
the existence of an Event of Default under Section 4.1(e) hereof and such Event of Default has been
remedied, cured or waived in accordance with Section 4.1(e) hereof, then, without any further
action by the Holders, such declaration of acceleration shall be rescinded automatically and the
consequences of such declaration shall be annulled. No such rescission or annulment shall affect
any subsequent Default or impair any right consequent thereon.

SECTION 4.3. Other Remedies. If an Event of Default with respect to Outstanding
Securities occurs and is continuing, the Trustee may pursue any available remedy by proceeding at
law or in equity to collect the payment of principal of or interest on the Securities or to enforce
the performance of any provision of the Securities.

The Trustee may maintain a proceeding in which it may prosecute and enforce all rights of
action and claims under this Indenture or the Securities, even if it does not possess any of the
Securities or does not produce any of them in the proceeding.

SECTION 4.4. Waiver of Past Defaults. The Holders, either (a) through the written
consent of not less than a majority in aggregate principal amount of the Outstanding Securities or
(b) by the adoption of a resolution, at a meeting of Holders of the Outstanding Securities at which
a quorum is present, by the Holders of at least a majority in aggregate principal amount of the
Outstanding Securities represented at such meeting, may, on behalf of the Holders of all of the
Securities, waive an existing Default or Event of Default, except a Default or Event of Default:

(1) in the payment of the principal of or premium, if any, or interest on any Security
(provided, however, that subject to Section 4.7 hereof, the Holders of a majority in aggregate
principal amount of the Outstanding Securities may rescind an acceleration and its consequences,
including any related payment default that resulted from such acceleration);

(2) in respect of the right to convert any Security in accordance with Article 12; or

(3) in respect of a covenant or provision hereof which, under Section 7.2 hereof, cannot be
modified or amended without the consent of the Holder of each Outstanding Security affected.

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 this Indenture; provided,
however, that no such waiver shall extend to any subsequent or other Default or impair any right
consequent thereon.

SECTION 4.5. Control by Majority. The Holders, either (a) through the written consent
of not less than a majority in aggregate principal amount of the Outstanding Securities, or (b) by
the adoption of a resolution, at a meeting of Holders of the Outstanding Securities at which a
quorum is present, by the Holders of at least a majority in aggregate principal amount of the
Outstanding Securities represented at such meeting, 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. However, the Trustee may refuse to follow any direction
that:

(1) conflicts with any law or with this Indenture,

(2) the Trustee determines may be unduly prejudicial to the rights of the Holders not joining
therein, or

(3) may expose the Trustee to personal liability.

The Trustee may take any other action deemed proper by the Trustee which is not inconsistent
with such direction.

SECTION 4.6. Limitation on Suit. No Holder of any Security shall have any right to
pursue any remedy with respect to this Indenture or the Securities (including instituting any
proceeding, judicial or otherwise, with respect to this Indenture or for the appointment of a
receiver or trustee) unless:

(1) such Holder has previously given written notice to the Trustee of an Event of Default that
is continuing;

(2) the Holders of at least 25% in aggregate principal amount of the Outstanding Securities
shall have made written request to the Trustee to pursue the remedy;

(3) such Holder or Holders have offered to the Trustee indemnity satisfactory to it against
any costs, expenses and liabilities incurred in complying with such request;

(4) the Trustee has failed to comply with the request for 60 days after its receipt of such
notice, request and offer of indemnity; and

(5) during such 60-day period, no direction inconsistent with such written request has been
given to the Trustee by the Holders of a majority in aggregate principal amount of the Outstanding
Securities (or such amount as shall have acted at a meeting pursuant to the provisions of this
Indenture);

provided, however, that no one or more of such Holders may use this Indenture to prejudice the
rights of another Holder or to obtain preference or priority over another Holder.

SECTION 4.7. Unconditional Rights of Holders to Receive Payment and to Convert.
Notwithstanding any other provision in this Indenture, the Holder of any Security shall have the
right, which is absolute and unconditional, to receive payment of the principal of and premium, if
any, and interest on such Security on the Stated Maturity expressed in such Security (or in the
case of the exercise of a Repurchase Right on the Repurchase Date) and to convert such Security in
accordance with Article 12, and to bring suit for the enforcement of any such payment on or after
such respective dates and right to convert, and such rights shall not be impaired or affected
without the consent of such Holder.

SECTION 4.8. Collection of Indebtedness and Suits for Enforcement by the Trustee. The
Company covenants that if:

(1) a Default or Event of Default occurs in the payment of any interest on any Security when
such interest becomes due and payable and such Default or Event of Default continues for a period
of 30 days, or

(2) a Default or Event of Default occurs in the payment of the principal of or premium, if
any, on any Security at the Maturity thereof, the Company shall, upon demand of the Trustee, pay to
it, for the benefit of the Holders of such Securities, the whole amount then due and payable (as
expressed therein or as a result of any acceleration effected pursuant to Section 4.2 hereof) on
such Securities for principal and premium, if any, and interest and, to the extent that payment of
such interest shall be legally enforceable, interest on any overdue principal and premium, if any,
and on any overdue interest, in each case at the Interest Rate, 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 the Company fails to pay such amounts forthwith upon such demand, the Trustee, in its own
name and as trustee of an express trust, may institute a judicial proceeding for the collection of
the sums so due and unpaid, may prosecute such proceeding to judgment or final decree and may
enforce the same against the Company and collect the moneys adjudged or decreed to be payable in
the manner provided by law out of the property of the Company, wherever situated.

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 of Securities by such appropriate
judicial proceedings as the Trustee shall deem most effectual to protect and enforce any such
rights, whether for the specific enforcement of any covenant or agreement in this Indenture or in
aid of the exercise of any power granted herein, or to enforce any other proper remedy.

SECTION 4.9. Trustee May File Proofs of Claim. In case of the pendency of any
receivership, insolvency, liquidation, bankruptcy, reorganization, arrangement, adjustment,
composition or other judicial proceeding relative to the Company or the property of the Company or
its creditors, the Trustee (irrespective of whether the principal of the Securities shall then be
due and payable as therein expressed or by declaration or otherwise and irrespective of whether the
Trustee shall have made any demand on the Company for the payment of overdue principal or interest)
shall be entitled and empowered, by intervention in such proceeding or otherwise, (1) to file and
prove a claim for the whole amount of principal and premium, if any, and interest owing and unpaid
in respect of the Securities and to file such other papers or documents as may be necessary or
advisable in order to have the claims of the Trustee (including any claim for the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agents and counsel) and of
the Holders of Securities allowed in such judicial proceeding, and (2) to collect and receive any
moneys or other property payable or deliverable on any such claim and to distribute the same; and
any custodian, receiver, assignee, trustee, liquidator, sequestrator or other similar official in
any such judicial proceedings is hereby authorized by each Holder of Securities 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 of Securities, to pay to the Trustee any amount due to 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 5.8.

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

SECTION 4.10. Restoration of Rights and Remedies. If the Trustee or any Holder of a
Security has instituted any proceeding to enforce any right or remedy under this 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 of Securities 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 4.11. Rights and Remedies Cumulative. Except as otherwise provided with
respect to the replacement or payment of mutilated, destroyed, lost or stolen Securities in the
last paragraph of Section 2.12, no right or remedy conferred in this Indenture upon or reserved to
the Trustee or to the Holders of Securities is intended to be exclusive of any other right or
remedy, and every right and remedy shall, to the extent permitted by law, be cumulative and in
addition to every other right and remedy given hereunder 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 4.12. Delay or Omission Not Waiver. No delay or omission of the Trustee or of
any Holder of any Security 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 any
acquiescence therein. Every right and remedy given by this Article or by law to the Trustee or to
the Holders of Securities may be exercised from time to time, and as often as may be deemed
expedient, by the Trustee or by the Holders of Securities, as the case may be.

SECTION 4.13. Application of Money Collected. Subject to Article 13, any money and
property 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 and
property on account of principal or premium, if any, or interest, upon presentation of the
Securities 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 for amounts due for outstanding fees and
expenses, including but not limited to fees and expenses of Trustee’s counsel and other experts
employed by the Trustee to assist it in performing its duties. The Trustee’s fees and expenses are
intended to constitute an “Administrative Expense” under the Bankruptcy Law;

SECOND: To the payment of the amounts then due and unpaid for principal of and premium, if
any, and interest (including, Additional Interest Amounts, if any) on the Securities and coupons in
respect of which or for the benefit of which such money has been collected, ratably, without
preference or priority of any kind, according to the amounts due and payable on such Securities for
principal and premium, if any, and interest, respectively; and

THIRD: Any remaining amounts shall be repaid to the Company.

SECTION 4.14. Undertaking for Costs. All parties to this Indenture agree, and each
Holder of any Security by such Holder’s acceptance thereof shall be deemed to have agreed, that any
court may in its discretion require, in any suit for the enforcement of any right or remedy under
this Indenture, or in any suit against the Trustee for any action taken, suffered or omitted by it
as Trustee, the filing by any party litigant in such suit of an undertaking to pay the costs of
such suit, and that such court may in its discretion assess reasonable costs, including reasonable
attorneys’ fees, against any party litigant in such suit, having due regard to the merits and good
faith of the claims or defenses made by such party litigant; but the provisions of this Section
shall not apply to any suit instituted by the Company, to any suit instituted by the Trustee, to
any suit instituted by any Holder, or group of Holders, holding in the aggregate more than 10% in
aggregate principal amount of the Outstanding Securities, or to any suit instituted by any Holder
of any Security for the enforcement of the payment of the principal of or premium, if any, or
interest on any Security on or after the Stated Maturity expressed in such Security (or, in the
case of exercise of a repurchase right, on or after the Repurchase Date) or for the enforcement of
the right to convert any Security in accordance with Article 12.

SECTION 4.15. 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 to take the benefit or advantage of, any stay or extension law wherever enacted,
now or at any time hereafter in force, which may affect the covenants or the performance of this
Indenture; and the Company (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.

ARTICLE 5

THE TRUSTEE

SECTION 5.1. Certain Duties and Responsibilities.

(a) Except during the continuance of an Event of Default,

(1) The Trustee undertakes to perform such duties and only such duties as are specifically set
forth in this Indenture or the TIA, and no implied covenants or obligations shall be read into this
Indenture against the Trustee; and

(2) In the absence of bad faith on its part, the Trustee may conclusively rely, as to the
truth of the statements and the correctness of the opinions expressed therein, upon certificates or
opinions furnished to the Trustee and conforming to the requirements of this Indenture; provided,
however, that in the case of any such certificates or opinions which by any provision hereof are
specifically required to be furnished to the Trustee, the Trustee shall examine the certificates or
opinions to determine whether or not, on their face, they conform to the requirements of this
Indenture (but need not investigate or confirm the accuracy of any facts stated therein).

(b) In case an Event of Default actually known to a Responsible Officer of the Trustee has
occurred and is continuing, the Trustee shall exercise such of the rights and powers vested in it
by this Indenture, and use the same degree of care and skill in their exercise, as a prudent person
would exercise or use under the circumstances in the conduct of such person’s own affairs.

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

(1) This paragraph (c) shall not be construed to limit the effect of paragraph (a) of this
Section 5.1;

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

(3) The Trustee shall not be liable with respect to any action taken or omitted to be taken by
it in good faith in accordance with a direction received by it of the Holders of a majority in
principal amount of the Outstanding Securities (or such lesser amount as shall have acted at a
meeting pursuant to the provisions of this Indenture) relating to the time, method and place of
conducting any proceeding for any remedy available to the Trustee, or exercising any trust or power
conferred upon the Trustee, under this Indenture.

(d) Whether or not herein expressly so provided, every provision of this Indenture relating to
the conduct or affecting the liability of or affording protection to the Trustee shall be subject
to the provisions of this Section 5.1.

(e) No provision of this Indenture shall require the Trustee to expend or risk its own funds
or otherwise incur any liability in the performance of any of its duties hereunder, or in the
exercise of any of its rights or powers. The Trustee may refuse to perform any duty or exercise
any right or power unless it receives indemnity satisfactory to it against any loss, liability,
cost or expense (including, without limitation, reasonable fees of counsel and costs incurred in
defending itself against any and all charges, claims, complaints, allegations, assertions or
demands of any nature whatsoever, except liability which is adjudicated to be a result of the
Trustee’s negligence or willful misconduct in connection with any such action).

(f) The Trustee shall not be obligated to pay interest on any money or other assets received
by it unless otherwise agreed in writing with the Company. Assets held in trust by the Trustee
need not be segregated from other funds except to the extent required by law.

(g) The Trustee shall not be bound to make any investigation into the facts or matters stated
in any resolution, certificate, statement, instrument, opinion, report, notice, request, direction,
consent, order, bond, debenture, note, coupon, other evidence of indebtedness or other paper or
document, but the Trustee, in its discretion, may make such further inquiry or investigation into
such facts or matters as it may see fit, and, if the Trustee shall determine to make such further
inquiry or investigation, it shall be entitled to examine the books, records and premises of the
Company, personally or by agent or attorney at the sole cost of the Company, and shall incur no
liability or additional liability of any kind by reason of such inquiry or investigation.

(h) The Trustee shall not be deemed to have notice or actual knowledge of any Default or Event
of Default unless a Responsible Officer of the Trustee has actual knowledge thereof or unless
written notice of any event which is in fact a Default or Event of Default is received by the
Trustee pursuant to Section 14.2 hereof, and such notice is received from the Company or the
Holders of not less than 25% in aggregate principal amount of the Securities then outstanding and
such notice references the Securities and this Indenture and, in the absence of such notice so
delivered the Trustee may conclusively assume no default exists.

(i) The rights, privileges, protections, immunities and benefits given to the Trustee
hereunder, including, without limitation, its right to be indemnified, are extended to, and shall
be enforceable by, the Trustee in each of its capacities hereunder, and each Paying Agent,
authenticating agent, Conversion Agent or Registrar acting hereunder.

SECTION 5.2. Certain Rights of Trustee. Subject to the provisions of Section 5.1
hereof and subject to Sections 315(a) through (d) of the TIA:

(1) The Trustee may rely on any document believed by it to be genuine and to have been signed
or presented by the proper person, and the Trustee shall be under no duty to make any investigation
as to any statement contained in any such instance, but may accept the same as conclusive evidence
of the truth and accuracy of such statement or the correctness of such opinions.

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

(3) The Trustee may act through attorneys and agents and shall not be responsible for the
misconduct or negligence of any attorney or agent appointed with due care.

(4) The Trustee shall not be liable for any action taken or omitted to be taken by it in good
faith which it believed to be authorized or within the discretion or rights or powers conferred
upon it by this Indenture.

(5) The Trustee may consult with counsel of its selection and the advice of such counsel as to
matters of law shall be full and complete authorization and protection in respect of any action
taken, omitted or suffered by it hereunder in good faith and in accordance with the advice or
opinion of such counsel.

(6) Unless otherwise specifically provided in this Indenture, any demand, request, direction
or notice from the Company shall be sufficient if signed by an Officer of the Company.

(7) The permissive rights of the Trustee to do things enumerated in this Indenture shall not
be construed as a duty unless so specified herein.

SECTION 5.3. Individual Rights of Trustee. The Trustee in its individual or any other
capacity may become the owner or pledgee of Securities and may otherwise deal with the Company or
any Affiliate of the Company with the same rights it would have if it were not Trustee. However,
in the event that the Trustee acquires any conflicting interest (as such term is defined in Section
310(b) of the TIA), it must eliminate such conflict within 90 days, apply to the SEC for permission
to continue as trustee (to the extent permitted under Section 310(b) of the TIA) or resign. Any
agent may do the same with like rights and duties. The Trustee is also subject to Sections 5.11
and 5.12 hereof.

SECTION 5.4. Money Held in Trust. Money held by the Trustee in trust hereunder need
not be segregated from other funds except to the extent required by law. The Trustee shall be
under no liability for interest on any money received by it hereunder except as otherwise expressly
agreed with the Company.

SECTION 5.5. Trustee’s Disclaimer. The recitals contained herein and in the
Securities (except for those in the certificate of authentication) shall be taken as the statements
of the Company, and the Trustee assumes no responsibility for their correctness. The Trustee makes
no representations as to the validity, sufficiency or priority of this Indenture or of the
Securities. The Trustee shall not be accountable for the use or application by the Company of
Securities or the proceeds thereof.

SECTION 5.6. Notice of Defaults. Within 90 days after the occurrence of any Default
or Event of Default hereunder of which the Trustee has received written notice, the Trustee shall
give notice to Holders pursuant to Section 14.2 hereof, unless such Default or Event of Default
shall have been cured or waived; provided, however, that, except in the case of a Default or Event
of Default in the payment of the principal of or premium, if any, or interest, or in the payment of
any repurchase obligation, on any Security, the Trustee shall be protected in withholding such
notice if and so long as Responsible Officers of the Trustee in good faith determine that the
withholding of such notice is in the interest of the Holders.

SECTION 5.7. Reports by Trustee to Holders. The Trustee shall transmit to Holders
such reports concerning the Trustee and its actions under this Indenture as may be required by
Section 313 of the TIA at the times and in the manner provided by the TIA.

A copy of each report at the time of its mailing to Holders shall be filed with the SEC, if
required, and each stock exchange, if any, on which the Securities are listed. The Company shall
promptly notify the Trustee when the Securities become listed on any stock exchange.

SECTION 5.8. Compensation and Indemnification. The Company covenants and agrees to
pay to the Trustee from time to time, and the Trustee shall be entitled to, reasonable compensation
(which shall not be limited by any provision of law in regard to the compensation of a trustee of
an express trust) and the Company covenants and agrees to pay or reimburse the Trustee upon its
request for all reasonable expenses, disbursements and advances incurred or made by it or on its
behalf in accordance with any of the provisions of this Indenture (including the reasonable
compensation and the expenses and disbursements of its counsel and of all agents and other persons
not regularly in its employ), except to the extent that any such expense, disbursement or advance
is due to its negligence or bad faith. When the Trustee incurs expenses or renders services in
connection with an Event of Default specified in Section 4.1 hereof, the expenses (including the
reasonable charges and expenses of its counsel) and the compensation for the services are intended
to constitute expenses of administration under any Bankruptcy Law. The Company also covenants to
indemnify the Trustee and its officers, directors, employees and agents for, and to hold such
Persons harmless against, any loss, liability or expense incurred by them, arising out of or in
connection with the acceptance or administration of this Indenture or the trusts hereunder or the
performance of their duties hereunder, including the costs and expenses of defending themselves
against or investigating any claim of liability in the premises, except to the extent that any such
loss, liability or expense was due to the negligence or willful misconduct of such Persons. The
obligations of the Company under this Section 5.8 to compensate and indemnify the Trustee and its
officers, directors, employees and agents and to pay or reimburse such Persons for expenses,
disbursements and advances shall constitute additional indebtedness hereunder and shall survive the
satisfaction and discharge of this Indenture or the earlier resignation or removal of the Trustee.
Such additional indebtedness shall be a senior claim to that of the Securities upon all property
and funds held or collected by the Trustee as such, except funds held in trust for the benefit of
the Holders of particular Securities, and the Securities are hereby subordinated to such senior
claim. “Trustee” for purposes of this Section 5.8 shall include any predecessor Trustee, but the
negligence or willful misconduct of any Trustee shall not affect the indemnification of any other
Trustee.

SECTION 5.9. Replacement of Trustee. A resignation or removal of the Trustee and
appointment of a successor Trustee shall become effective only upon the successor Trustee’s
acceptance of appointment as provided in this Section 5.9.

The Trustee may resign and be discharged from the trust hereby created by so notifying the
Company in writing. The Holders of at least a majority in aggregate principal amount of
Outstanding Securities may remove the Trustee by so notifying the Trustee and the Company in
writing. The Company must remove the Trustee if:

(i) the Trustee fails to comply with Section 5.11 hereof or Section 310 of the TIA;

(ii) the Trustee becomes incapable of acting;

(iii) the Trustee is adjudged a bankrupt or an insolvent or an order for relief is entered
with respect to the Trustee under any Bankruptcy Law; or

(iv) a Custodian or public officer takes charge of the Trustee or its property.

If the Trustee resigns or is removed or if a vacancy exists in the office of the Trustee for
any reason, the Company shall promptly appoint a successor Trustee. The Trustee shall be entitled
to payment of its fees and reimbursement of its expenses while acting as Trustee. Within one year
after the successor Trustee takes office, the Holders of at least a majority in aggregate principal
amount of Outstanding Securities may appoint a successor Trustee to replace the successor Trustee
appointed by the Company.

Any Holder may petition any court of competent jurisdiction for the removal of the Trustee and
the appointment of a successor Trustee if the Trustee fails to comply with Section 5.11 hereof.

If an instrument of acceptance by a successor Trustee shall not have been delivered to the
Trustee within 30 days after the giving of such notice of resignation or removal, the resigning or
removed Trustee, as the case may be, may petition, at the expense of the Company, any court of
competent jurisdiction for the appointment of a successor Trustee.

A successor Trustee shall deliver a written acceptance of its appointment to the retiring
Trustee and to the Company. Thereupon the resignation or removal of the retiring Trustee shall
become effective, and the successor Trustee shall have all the rights, powers and duties of the
Trustee under this Indenture. The Company shall mail a notice of the successor Trustee’s
succession to the Holders. The retiring Trustee shall promptly transfer all property held by it as
Trustee to the successor Trustee. Notwithstanding replacement of the Trustee pursuant to this
Section 5.9, the Company’s obligations under Section 5.8 hereof shall continue for the benefit of
the retiring Trustee with respect to expenses, losses and liabilities incurred by it prior to such
replacement.

SECTION 5.10. Successor Trustee by Merger, Etc. Subject to Section 5.11 hereof, if
the Trustee consolidates with, merges or converts into, or transfers or sells all or substantially
all of its corporate trust business to, another corporation or national banking association, the
successor entity without any further act shall be the successor Trustee as to the Securities.

SECTION 5.11. Corporate Trustee Required; Eligibility. The Trustee shall at all times
satisfy the requirements of Sections 310(a)(1), (2) and (5) of the TIA. The Trustee shall at all
times have (or, in the case of a corporation included in a bank holding company system, the related
bank holding company shall at all times have) a combined capital and surplus of at least $100
million as set forth in its (or its related bank holding company’s) most recent published annual
report of condition. The Trustee is subject to Section 310(b) of the TIA.

SECTION 5.12. Collection of Claims Against the Company. The Trustee is subject to
Section 311(a) of the TIA, excluding any creditor relationship listed in Section 311(b) of the TIA.
A Trustee who has resigned or been removed shall be subject to Section 311(a) of the TIA to the
extent indicated therein.

ARTICLE 6

CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 6.1. Company May Consolidate, Etc. Only on Certain Terms. The Company shall not
consolidate with or merge into any other Person or convey, transfer or lease its properties and
assets substantially as an entirety to any Person, and the Company shall not permit any Person to
consolidate with or merge into the Company or convey, transfer or lease its properties and assets
substantially as an entirety to the Company, unless:

(1) in the event that the Company shall consolidate with or merge into another Person or
convey, transfer or lease its properties and assets substantially as an entirety to any Person, the
Person formed by such consolidation or into which the Company is merged or the Person which
acquires by conveyance or transfer, or which leases, the properties and assets of the Company
substantially as an entirety shall be a corporation, limited liability company, partnership or
trust organized and validly existing under the laws of the United States of America, any State
thereof or the District of Columbia and, if the entity surviving such transaction or transferee
entity is not the Company, then such surviving or transferee entity shall expressly assume, by an
indenture supplemental hereto, executed and delivered to the Trustee, in form satisfactory to the
Trustee, the due and punctual payment of the principal of and premium, if any and interest on all
the Securities and the performance of every covenant of this Indenture on the party of the Company
to be performed or observed and shall have provided for conversion rights in accordance with
Section 12.11 hereof;

(2) at the time of consummation of such transaction, no Event of Default, and no event which,
after notice or lapse of time or both, would become an Event of Default, shall have happened and be
continuing;

(3) if as a result of such transaction the Securities become convertible into common stock or
other securities issued by any Person other than the Company, such Person fully and unconditionally
guarantees all obligations of the Company or the surviving or transferee entity under the
Securities and this Indenture; and

(4) the Company shall have 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.

SECTION 6.2. Successor Substituted. Upon any consolidation or merger by the Company
with or into any other Person or any conveyance, transfer or lease of the properties and assets of
the Company substantially as an entirety to any Person, in accordance with Section 6.1 hereof, 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 be substituted for, and may exercise
every right and power of, the Company under this Indenture with the same effect as if such
successor Person had been named as the Company herein, and thereafter, except in the case of a
lease to another Person, the predecessor Person shall be relieved of all obligations and covenants
under this Indenture and the Securities.

ARTICLE 7

AMENDMENTS, SUPPLEMENTS AND WAIVERS

SECTION 7.1. Without Consent of Holders of Securities. Without the consent of any
Holders of Securities, the Company, when authorized by a Board Resolution, and the Trustee, at any
time and from time to time, may amend this Indenture and the Securities to:

(a) add to the covenants of the Company or provide Guarantees for the benefit of the Holders
of Securities;

(b) surrender any right or power herein conferred upon the Company;

(c) make provision with respect to the conversion rights of Holders of Securities pursuant to
Section 12.11 hereof;

(d) provide for the assumption of the Company’s obligations to the Holders of Securities in
the case of a merger, consolidation, conveyance, transfer or lease pursuant to Article 6 hereof;

(e) increase the Conversion Rate; provided, however, that such increase in the Conversion Rate
shall not adversely affect the interest of the Holders of Securities (after taking into account tax
and other consequences of such increase) in any material respect;

(f) comply with the requirements of the SEC in order to effect or maintain the qualification
of this Indenture under the TIA;

(g) cure any ambiguity, correct or supplement any provision herein which may be inconsistent
with any other provision herein or which is otherwise defective, or make any other provisions with
respect to matters or questions arising under this Indenture which the Company and the Trustee may
deem necessary or desirable and which shall not be inconsistent with the provisions of this
Indenture; provided, however, that such action pursuant to this clause (g) does not, in the good
faith opinion of the Board of Directors and the Trustee, adversely affect the interests of the
Holders of Securities in any material respect; or

(h) make any changes or modifications to this Indenture necessary in connection with the
registration of the Securities under the Securities Act as contemplated by the Registration Rights
Agreement; provided that this action does not adversely affect the interests of the Holders in any
material respect; or

(i) add or modify any other provisions with respect to matters or questions arising under this
Indenture which the Company and the Trustee may deem necessary or desirable and which shall not be
inconsistent with the provisions of this Indenture, provided, however, that such action pursuant to
this clause (i) does not adversely affect the interests of the Holders of Securities in any
material respect.

SECTION 7.2. With Consent of Holders of Securities. Except as provided below in this
Section 7.2, this Indenture or the Securities may be amended or supplemented, and noncompliance by
the Company in any particular instance with any provision of this Indenture or the Securities may
be waived, in each case (i) with the consent of the Holders of at least a majority in aggregate
principal amount of the Outstanding Securities or (ii) by the adoption of a resolution, at a
meeting of Holders of the Outstanding Securities at which a quorum is present, by the Holders of a
majority in aggregate principal amount of the Outstanding Securities represented at such meeting.

Without the written consent or the affirmative vote of each Holder of Securities affected, an
amendment or waiver under this Section 7.2 may not:

(a) change the Stated Maturity of the principal of, or any installment of interest on, any
Security or any payment of Additional Interest Amounts;

(b) reduce the principal amount of or premium, or interest on or any payment of Additional
Interest Amounts on, if any, on any Security;

(c) reduce the Interest Rate or interest on any Security;

(d) change the currency of payment of principal of, premium, if any, or interest on any
Security;

(e) impair the right of any Holder to institute suit for the enforcement of any payment on or
with respect to, or the conversion of, any Security;

(f) modify the obligation of the Company to maintain an office or agency in The City of New
York pursuant to Section 9.2 hereof;

(g) except as permitted by Section 12.11 hereof, adversely affect the right to convert any
Security as provided in Article 12 hereof;

(h) adversely affect the Repurchase Right;

(i) modify the subordination provisions of the Securities in a manner adverse to the Holders
of Securities;

(j) modify any of the provisions of this Section, Section 4.4 or Section 14.11, except to
increase any percentage contained herein or therein or to provide that certain other provisions of
this Indenture cannot be modified or waived without the consent of the Holder of each Outstanding
Security affected thereby; or

(k) reduce the requirements of Section 8.4 hereof for quorum or voting, or reduce the
percentage in aggregate principal amount of the Outstanding Securities the consent of whose Holders
is required for any such supplemental indenture or the consent of whose Holders is required for any
waiver provided for in this Indenture.

It shall not be necessary for any Act of Holders of Securities under this Section to approve
the particular form of any proposed supplemental indenture, but it shall be sufficient if such Act
shall approve the substance thereof.

SECTION 7.3. Compliance with Trust Indenture Act. Every amendment to this Indenture
or the Securities shall be set forth in a supplemental indenture that complies with the TIA as then
in effect.

SECTION 7.4. Revocation of Consents and Effect of Consents or Votes. Until an
amendment, supplement or waiver becomes effective, a written consent to it by a Holder is a
continuing consent by the Holder and every subsequent Holder of a Security or portion of a Security
that evidences the same debt as the consenting Holder’s Security, even if notation of the consent
is not made on any Security; provided, however, that unless a record date shall have been
established, any such Holder or subsequent Holder may revoke the consent as to its Security or
portion of a Security if the Trustee receives written notice of revocation before the date the
amendment, supplement or waiver becomes effective.

An amendment, supplement or waiver becomes effective on receipt by the Trustee of written
consents from or affirmative votes by, as the case may be, the Holders of the requisite percentage
of aggregate principal amount of the Outstanding Securities, and thereafter shall bind every Holder
of Securities; provided, however, if the amendment, supplement or waiver makes a change described
in any of clauses (a) through (k) of Section 7.2 hereof, the amendment, supplement or waiver shall
bind only each Holder of a Security which has consented to it or voted for it, as the case may be,
and every subsequent Holder of a Security or portion of a Security that evidences the same
indebtedness as the Security of the consenting or affirmatively voting, as the case may be, Holder.

SECTION 7.5. Notation on or Exchange of Securities. If an amendment, supplement or
waiver changes the terms of a Security:

(a) the Trustee may require the Holder of a Security to deliver such Security to the Trustee,
the Trustee may place an appropriate notation on the Security about the changed terms and return it
to the Holder and the Trustee may place an appropriate notation on any Security thereafter
authenticated; or

(b) if the Company or the Trustee so determines, the Company in exchange for the Security
shall issue and the Trustee shall authenticate a new Security that reflects the changed terms.

Failure to make the appropriate notation or issue a new Security shall not affect the validity
and effect of such amendment, supplement or waiver.

SECTION 7.6. Trustee to Sign Amendment, Etc. The Trustee shall sign any amendment
authorized pursuant to this Article 7 if the amendment does not adversely affect the rights,
duties, liabilities or immunities of the Trustee. If the amendment does adversely affect the
rights, duties, liabilities or immunities of the Trustee, the Trustee may but need not sign it. In
signing or refusing to sign such amendment, the Trustee shall be entitled to receive and shall be
fully protected in relying upon an Officers’ Certificate and an Opinion of Counsel as conclusive
evidence that such amendment is authorized or permitted by this Indenture.

ARTICLE 8

MEETING OF HOLDERS OF SECURITIES

SECTION 8.1. Purposes for Which Meetings May Be Called. A meeting of Holders of
Securities may be called at any time and from time to time pursuant to this Article to make, give
or take any request, demand, authorization, direction, notice, consent, waiver or other action
provided by this Indenture to be made, given or taken by Holders of Securities.

Notwithstanding anything contained in this Article 8, the Trustee may, during the pendency of
a Default or an Event of Default, call a meeting of Holders of Securities in accordance with its
standard practices.

SECTION 8.2. Call Notice and Place of Meetings.

(a) The Trustee may at any time call a meeting of Holders of Securities for any purpose
specified in Section 8.1 hereof, to be held at such time and at such place in The City of New York.
Notice of every meeting of Holders of Securities, setting forth the time and the place of such
meeting, in general terms the action proposed to be taken at such meeting and the percentage of the
principal amount of the Outstanding Securities which shall constitute a quorum at such meeting,
shall be given, in the manner provided in Section 14.2 hereof, not less than 21 nor more than 180
days prior to the date fixed for the meeting.

(b) In case at any time the Company, pursuant to a Board Resolution, or the Holders of at
least 10% in principal amount of the Outstanding Securities shall have requested the Trustee to
call a meeting of the Holders of Securities for any purpose specified in Section 8.1 hereof, by
written request setting forth in reasonable detail the action proposed to be taken at the meeting,
and the Trustee shall not have made the first publication of the notice of such meeting within 21
days after receipt of such request or shall not thereafter proceed to cause the meeting to be held
as provided herein, then the Company or the Holders of Securities in the amount specified, as the
case may be, may determine the time and the place in The City of New York for such meeting and may
call such meeting for such purposes by giving notice thereof as provided in paragraph (a) of this
Section.

SECTION 8.3. Persons Entitled to Vote at Meetings. To be entitled to vote at any
meeting of Holders of Securities, a Person shall be (a) a Holder of one or more Outstanding
Securities or (b) a Person appointed by an instrument in writing as proxy for a Holder or Holders
of one or more Outstanding Securities by such Holder or Holders. The only Persons who shall be
entitled to be present or to speak at any meeting of Holders shall be the Persons entitled to vote
at such meeting and their counsel, any representatives of the Trustee and its counsel and any
representatives of the Company and its counsel.

SECTION 8.4. Quorum; Action. The Persons entitled to vote a majority in principal
amount of the Outstanding Securities shall constitute a quorum. In the absence of a quorum within
30 minutes of the time appointed for any such meeting, the meeting shall, if convened at the
request of Holders of Securities, be dissolved. In any other case, the meeting may be adjourned
for a period of not less than 10 days as determined by the chairman of the meeting prior to the
adjournment of such meeting. In the absence of a quorum at any such adjourned meeting, such
adjourned meeting may be further adjourned for a period of not less than 10 days as determined by
the chairman of the meeting prior to the adjournment of such adjourned meeting. Notice of the
reconvening of any adjourned meeting shall be given as provided in Section 8.2(a) hereof, except
that such notice need be given only once and not less than five days prior to the date on which the
meeting is scheduled to be reconvened.

At a meeting or an adjourned meeting duly reconvened and at which a quorum is present as
aforesaid, any resolution and all matters (except as limited by the second paragraph of Section 7.2
hereof) shall be effectively passed and decided if passed or decided by the Persons entitled to
vote not less than a majority in principal amount of Outstanding Securities represented and voting
at such meeting.

Any resolution passed or decisions taken at any meeting of Holders of Securities duly held in
accordance with this Section shall be binding on all the Holders of Securities, whether or not
present or represented at the meeting.

SECTION 8.5. Determination of Voting Rights; Conduct and Adjournment of Meetings.

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

(b) The Trustee shall, by an instrument in writing, appoint a temporary chairman (which may be
the Trustee) of the meeting, unless the meeting shall have been called by the Company or by Holders
of Securities as provided in Section 8.2(b) hereof, in which case the Company or the Holders of
Securities calling the meeting, as the case may be, shall in like manner appoint a temporary
chairman. A permanent chairman and a permanent secretary of the meeting shall be elected by vote
of the Persons entitled to vote a majority in principal amount of the Outstanding Securities
represented at the meeting.

(c) At any meeting, each Holder of a Security or proxy shall be entitled to one vote for each
$1,000 principal amount of Securities held or represented by him; provided, however, that no vote
shall be cast or counted at any meeting in respect of any Security challenged as not Outstanding
and ruled by the chairman of the meeting to be not Outstanding. The chairman of the meeting shall
have no right to vote, except as a Holder of a Security or proxy.

(d) Any meeting of Holders of Securities duly called pursuant to Section 8.2 hereof at which a
quorum is present may be adjourned from time to time by Persons entitled to vote a majority in
principal amount of the Outstanding Securities represented at the meeting, and the meeting may be
held as so adjourned without further notice.

SECTION 8.6. Counting Votes and Recording Action of Meetings. The vote upon any
resolution submitted to any meeting of Holders of Securities shall be by written ballots on which
shall be subscribed the signatures of the Holders of Securities or of their representatives by
proxy and the principal amounts and serial numbers of the Outstanding Securities held or
represented by them. The permanent chairman of the meeting shall appoint two inspectors of votes
who shall count all votes cast at the meeting for or against any resolution and who shall make and
file with the secretary of the meeting their verified written reports in duplicate of all votes
cast at the meeting. A record, at least in duplicate, of the proceedings of each meeting of
Holders of Securities shall be prepared by the secretary of the meeting and there shall be attached
to said record the original reports of the inspectors of votes on any vote by ballot taken thereat
and affidavits by one or more Persons having knowledge of the facts setting forth a copy of the
notice of the meeting and showing that said notice was given as provided in Section 8.2 hereof and,
if applicable, Section 8.4 hereof. Each copy shall be signed and verified by the affidavits of the
permanent chairman and secretary of the meeting and one such copy shall be delivered to the Company
and another to the Trustee to be preserved by the Trustee, the latter to have attached thereto the
ballots voted at the meeting. Any record so signed and verified shall be conclusive evidence of
the matters therein stated.

ARTICLE 9

COVENANTS

SECTION 9.1. Payment of Principal, Premium and Interest. The Company will duly and
punctually pay the principal of and premium, if any, and interest on the Securities in accordance
with the terms of the Securities and this Indenture. The Company will deposit or cause to be
deposited with the Trustee as directed by the Trustee, no later than the day of the Stated Maturity
of any Security or installment of interest, all payments so due. Except as otherwise noted, all
references to the payment of interest include the payment of Additional Interest Amounts.

SECTION 9.2. Maintenance of Offices or Agencies. The Company hereby appoints the
Trustee’s Corporate Trust Office as its office in The City of New York where Securities may be:

(i) presented or surrendered for payment;

(ii) surrendered for registration of transfer or exchange;

(iii) surrendered for conversion;

and where notices and demands to or upon the Company in respect of the Securities and this
Indenture may be served.

The Company may at any time and from time to time vary or terminate the appointment of any
such office or appoint any additional offices for any or all of such purposes; provided, however,
that until all of the Securities have been delivered to the Trustee for cancellation, or moneys
sufficient to pay the principal of and premium, if any, and interest on the Securities have been
made available for payment and either paid or returned to the Company pursuant to the provisions of
Section 9.3 hereof, the Company will maintain in The City of New York, an office or agency where
Securities may be presented or surrendered for payment, where Securities may be surrendered for
registration of transfer or exchange, where Securities may be surrendered for conversion and where
notices and demands to or upon the Company in respect of the Securities and this Indenture may be
served. The Company will give prompt written notice to the Trustee, and notice to the Holders in
accordance with Section 14.2 hereof, of the appointment or termination of any such agents and of
the location and any change in the location of any such office or agency.

If at any time the Company shall fail to maintain any such required office or agency in The
City of New York, or shall fail to furnish the Trustee with the address thereof, presentations and
surrenders may be made at, and notices and demands may be served on, the Corporate Trust Office of
the Trustee.

SECTION 9.3. Corporate Existence. Subject to Article 6 hereof, the Company will do or
cause to be done all things necessary to preserve and keep in full force and effect its corporate
existence, rights (charter and statutory) and franchises; provided, however, that the Company shall
not be required to preserve any such right or franchise if the Company determines 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.

SECTION 9.4. Maintenance of Properties. The Company will maintain and keep its
properties and every part thereof in such repair, working order and condition, and make or cause to
be made all such needful and proper repairs, renewals and replacements thereof, as in the judgment
of the Company are necessary in the interests of the Company; provided, however, that nothing
contained in this Section shall prevent the Company from selling, abandoning or otherwise disposing
of any of its properties or discontinuing a part of its business from time to time if, in the
judgment of the Company, such sale, abandonment, disposition or discontinuance is advisable and
does not materially adversely affect the interests or business of the Company.

SECTION 9.5. Payment of Taxes and Other Claims. The Company will, and will cause any
Significant Subsidiary to, promptly pay and discharge or cause to be paid and discharged all
material taxes, assessments and governmental charges or levies lawfully imposed upon it or upon its
income or profits or upon any of its property, real or personal, or upon any part thereof, as well
as all material claims for labor, materials and supplies which, if unpaid, might by law become a
lien or charge upon its property; provided, however, that neither the Company nor any Significant
Subsidiary shall be required to pay or discharge or cause to be paid or discharged any such tax,
assessment, charge, levy or claim if the amount, applicability or validity thereof shall currently
be contested in good faith by appropriate proceedings and if the Company or such Significant
Subsidiary, as the case may be, shall have set aside on its books reserves deemed by it adequate
with respect thereto.

SECTION 9.6. Reports. The Company shall deliver to the Trustee within 15 days after
it files them with the SEC copies of the annual reports and of the information, documents and other
reports (or copies of such portions of any of the foregoing as the SEC may by rules and regulations
prescribe) which the Company is required to file with the SEC pursuant to Section 13 or 15(d) of
the Exchange Act; provided, however, that the Company shall not be required to deliver to the
Trustee any materials for which the Company has sought and received confidential treatment by the
SEC. The Company also shall comply with the other provisions of Section 314(a) of the TIA.

SECTION 9.7. Compliance Certificate. The Company shall deliver to the Trustee, within
90 days after the end of each fiscal year of the Company, an Officers’ Certificate stating that in
the course of the performance by the signers of their duties as Officers of the Company, they would
normally have knowledge of any failure by the Company to comply with all conditions, or Default by
the Company with respect to any covenants, under this Indenture, and further stating whether or not
they have knowledge of any such failure or Default and, if so, specifying each such failure or
Default and the nature thereof. Within five Business Days of an Officer of the Company coming to
have actual knowledge of a Default, regardless of the date, the Company shall deliver an Officers’
Certificate to the Trustee specifying such Default and the nature and status thereof.

SECTION 9.8. [Reserved]

SECTION 9.9. Additional Interest Amounts Notice. In the event that the Company is
required to pay Additional Interest Amounts to Holders pursuant to the Registration Rights
Agreement, the Company will provide written notice (“Additional Interest Amount Notice”) to the
Trustee of its obligation to pay Additional Interest Amounts no later than fifteen (15) days prior
to the proposed payment date for the Additional Interest Amounts, and the Additional Interest
Amounts Notice shall set forth the amount of Additional Interest Amounts to be paid by the Company
on such payment date. The Trustee shall not at any time be under any duty or responsibility to any
Holder to determine the Additional Interest Amounts, or with respect to the nature, extent or
calculation of the amount of Additional Interest Amounts when made, or with respect to the method
employed in such calculation of the Additional Interest Amounts.

ARTICLE 10

[RESERVED]

ARTICLE 11

REPURCHASE OF SECURITIES

SECTION 11.1. Repurchase Right Upon Fundamental Change.

(a) In the event that a Fundamental Change shall occur, each Holder shall have the right (the
“Repurchase Right”), at the Holder’s option, but subject to the provisions of Section 11.3 hereof,
to require the Company to repurchase, and upon the exercise of such right the Company shall
repurchase, all of such Holder’s Securities or any portion of the principal amount thereof that is
equal to $1,000 or any integral multiple thereof (provided, however, that no single Security may be
repurchased in part unless the portion of the principal amount of such Security to be Outstanding
after such repurchase is equal to $1,000 or integral multiples thereof), on the date (the
“Repurchase Date”) that is 45 days after the date of the Company Notice at a purchase price equal
to 100% of the principal amount of the Securities to be repurchased (the “Repurchase Price”), plus
interest accrued and unpaid to, but excluding, the Repurchase Date; provided, however, that
installments of interest on Securities whose Stated Maturity is prior to or on the Repurchase Date
shall be payable to the Holders of such Securities, or one or more Predecessor Securities,
registered as such on the relevant Record Date according to their terms and the provisions of
Section 2.1 hereof.

(b) The Company may elect to pay the Repurchase Price by delivering that number of shares of
Common Stock equal to (i) the Repurchase Price divided by (ii) 95% of the average of the daily
volume-weighted average price of the Common Stock for the twenty (20) consecutive Trading Days
immediately preceding and including the third Business Day prior to the Repurchase Date (if the
third Business Day prior to the Repurchase Date is a Trading Day, or if not, then on the last
Trading Day prior to the third Business Day), appropriately adjusted to take into account the
occurrence, during the period commencing on the first Trading Day during the twenty Trading-Day
period and ending on the Repurchase Date of any event that would result in an adjustment to the
conversion rate set forth in Section 12.1(c).

(c) Whenever in this Indenture (including Sections 2.2, 4.1(a) and 4.7 hereof) or Exhibit
A annexed hereto there is a reference, in any context, to the principal of any Security as of
any time, such reference shall be deemed to include reference to the Repurchase Price, payable in
respect to such Security to the extent that such Repurchase Price is, was or would be so payable at
such time, and express mention of the Repurchase Price in any provision of this Indenture shall not
be construed as excluding the Repurchase Price in those provisions of this Indenture when such
express mention is not made; provided, however, that for the purposes of Article 13 hereof, such
reference shall be deemed to include reference to the Repurchase Price only to the extent the
Repurchase Price is payable in cash.

	 	 	 
	SECTION 11.2.

	 	[Reserved]
	
 
	 	 
	SECTION 11.3.

	 	Notices; Method of Exercising Repurchase Right, Etc
	
 
	 	 

(a) Prior to or on the 30th day after the occurrence of a Fundamental Change, the Company, or,
at the written request and expense of the Company prior to or on the 30th day after such
occurrence, the Trustee shall give to all Holders of Securities notice, in the manner provided in
Section 14.2 hereof, of the occurrence of the Fundamental Change and of the Repurchase Right set
forth herein arising as a result thereof (the “Company Notice”). The Company shall also deliver a
copy of such notice of a Repurchase Right to the Trustee. Each notice of a Repurchase Right shall
state:

(1) the Repurchase Date;

(2) the date by which the Repurchase Right must be exercised;

(3) the Repurchase Price and accrued and unpaid interest, if any, and whether the Repurchase
Price shall be paid by the Company in cash or by delivery of shares of Common Stock;

(4) a description of the procedure which a Holder must follow to exercise a Repurchase Right,
and the place or places where such Securities, are to be surrendered for payment of the Repurchase
Price and accrued and unpaid interest, if any;

(5) that on the Repurchase Date the Repurchase Price and accrued and unpaid interest, if any,
will become due and payable upon each such Security designated by the Holder to be repurchased, and
that interest thereon shall cease to accrue on and after said date;

(6) the Conversion Rate then in effect, the date on which the right to convert the principal
amount of the Securities to be repurchased will terminate and the place where such Securities may
be surrendered for conversion;

(7) the place or places where such Securities, together with the Option to Elect Repayment
Upon a Change of Control certificate included in Exhibit A annexed hereto are to be
delivered for payment of the Repurchase Price and accrued and unpaid interest, if any; and

(8) whether a Make-Whole Premium shall be payable by the Company upon conversion.

No failure of the Company to give the foregoing notices or defect therein shall limit any
Holder’s right to exercise a Repurchase Right or affect the validity of the proceedings for the
repurchase of Securities.

If any of the foregoing provisions or other provisions of this Article 11 are inconsistent
with applicable law, such law shall govern.

(b) To exercise a Repurchase Right, a Holder shall deliver to the Trustee prior to or on the
30th day after the date of the Company Notice:

(1) written notice of the Holder’s exercise of such right, which notice shall set forth the
name of the Holder, the principal amount of the Securities to be repurchased (and, if any Security
is to be repurchased in part, the serial number thereof, the portion of the principal amount
thereof to be repurchased) and a statement that an election to exercise the Repurchase Right is
being made thereby, and, in the event that the Repurchase Price shall be paid in shares of Common
Stock, the name or names (with addresses) in which the certificate or certificates for shares of
Common Stock shall be issued, and

(2) the Securities with respect to which the Repurchase Right is being exercised.

Such written notice shall be irrevocable, except that the right of the Holder to convert the
Securities with respect to which the Repurchase Right is being exercised shall continue until the
close of business on the Business Day immediately preceding the Repurchase Date.

(c) In the event a Repurchase Right shall be exercised in accordance with the terms hereof,
the Company shall pay or cause to be paid to the Trustee the Repurchase Price in cash for payment
to the Holder on the Repurchase Date or, if shares of Common Stock are to be paid, shares of Common
Stock, as provided above, as promptly after the Repurchase Date as practicable, together with
accrued and unpaid interest to the Repurchase Date payable in cash with respect to the Securities
as to which the Repurchase Right has been exercised; provided, however, that installments of
interest that mature prior to or on the Repurchase Date shall be payable in cash to the Holders of
such Securities, or one or more Predecessor Securities, registered as such at the close of business
on the relevant Regular Record Date.

(d) If any Security (or portion thereof) surrendered for repurchase shall not be so paid on
the Repurchase Date, the principal amount of such Security (or portion thereof, as the case may be)
shall, until paid, bear interest to the extent permitted by applicable law from the Repurchase Date
at the Interest Rate, and each Security shall remain convertible into Common Stock until the
principal of such Security (or portion thereof, as the case may be) shall have been paid or duly
provided for.

(e) Any Security which 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 and the Trustee 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 Security without service charge,
a new Security or Securities, 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 Security so surrendered.

(f) Any issuance of shares of Common Stock in respect of the Repurchase Price shall be deemed
to have been effected immediately prior to the close of business on the Repurchase Date and the
Person or Persons in whose name or names any certificate or certificates for shares of Common Stock
shall be issuable upon such repurchase shall be deemed to have become on the Repurchase Date the
holder or holders of record of the shares represented thereby; provided, however, that any
surrender for repurchase on a date when the stock transfer books of the Company shall be closed
shall constitute the Person or Persons in whose name or names the certificate or certificates for
such shares are to be issued as the record holder or holders thereof for all purposes at the
opening of business on the next succeeding day on which such stock transfer books are open. No
payment or adjustment shall be made for dividends or distributions on any Common Stock issued upon
repurchase of any Security declared prior to the Repurchase Date.

(g) No fractions of shares of Common Stock shall be issued upon repurchase of any Security or
Securities. If more than one Security shall be repurchased from the same Holder and the Repurchase
Price shall be payable in shares of Common Stock, the number of full shares which shall be issued
upon such repurchase shall be computed on the basis of the aggregate principal amount of the
Securities (or specified portions thereof) to be so repurchased. Instead of any fractional share
of Common Stock which would otherwise be issued on the repurchase of any Security or Securities (or
specified portions thereof), the Company shall pay a cash adjustment in respect of such fraction
(calculated to the nearest one-100th of a share) in an amount equal to the same fraction of the
Quoted Price of the Common Stock as of the Trading Day preceding the Repurchase Date.

(h) Any issuance and delivery of certificates for shares of Common Stock on repurchase of
Securities shall be made without charge to the Holder of Securities being repurchased for such
certificates or for any tax or duty in respect of the issuance or delivery of such certificates or
the Securities represented thereby; provided, however, that the Company shall not be required to
pay any tax or duty which may be payable in respect of (i) income of the Holder or (ii) any
transfer involved in the issuance or delivery of certificates for shares of Common Stock in a name
other than that of the Holder of the Securities being repurchased, and no such issuance or delivery
shall be made unless the Persons requesting such issuance or delivery has paid to the Company the
amount of any such tax or duty or has established, to the satisfaction of the Company, that such
tax or duty has been paid.

(i) All Securities delivered for repurchase shall be delivered to the Trustee to be canceled
at the direction of the Trustee, which shall dispose of the same as provided in Section 2.15
hereof.

ARTICLE 12

CONVERSION OF SECURITIES

SECTION 12.1. Conversion Right and Conversion Rate.

(a) Subject to and upon compliance with the provisions of this Article, at the option of the
Holder thereof, any Security or any portion of the principal amount thereof which is $1,000 or an
integral multiple of $1,000 may be converted at the principal amount thereof, or of such portion
thereof, into the number of duly authorized, fully paid and nonassessable shares of Common Stock at
the Conversion Rate, determined as hereinafter provided, in effect at the time of conversion. Such
conversion right shall expire at the close of business on September 27, 2012.

(b) In the case of a Fundamental Change for which the Holder exercises its Repurchase Right
with respect to a Security or portion thereof, such conversion right in respect of the Security or
portion thereof shall expire at the close of business on the Business Day preceding the Repurchase
Date.

(c) The rate at which shares of Common Stock shall be delivered upon conversion (the
“Conversion Rate”) shall be initially equal to 24.0964 shares of Common Stock per $1,000 principal
amount of Securities. The Conversion Rate shall be adjusted in certain instances as provided in
paragraphs (a), (b), (c), (d), (e), (f), (h) and (l) of Section 12.4 hereof.

(d) If a Holder converts its Securities in connection with a Fundamental Change, such Holder
will be entitled to receive an amount, payable in Common Stock equal to the Make-Whole Premium
pursuant to Section 12.13, in addition to the shares of Common Stock deliverable upon conversion of
the Securities.

SECTION 12.2. Exercise of Conversion Right. To exercise the conversion right, the
Holder of any Security to be converted shall surrender such Security duly endorsed or assigned to
the Company or in blank, at the office of any Conversion Agent, accompanied by a duly signed
conversion notice substantially in the form attached to the Security to the Company stating that
the Holder elects to convert such Security or, if less than the entire principal amount thereof is
to be converted, the portion thereof to be converted.

Any Holder which surrenders any Security for conversion during the period between the close of
business on any Regular Record Date and ending with the opening of business on the corresponding
Interest Payment Date (except in the case of any Security whose Maturity is prior to such Interest
Payment Date) shall be accompanied by payment in New York Clearing House funds or other funds
acceptable to the Company of an amount equal to the interest to be received on such Interest
Payment Date on the principal amount of the Security being surrendered for conversion (but
excluding any overdue interest on the principal amount of such Security so converted that exists at
the time such Holder surrenders such Security for conversion). Notwithstanding the foregoing, any
such Holder which surrenders for conversion any Security with respect to which the Company has
specified a Repurchase Date that is after such Regular Record Date and on or prior to the next
succeeding Interest Payment Date need not pay the Company an amount equal to the interest in the
principal amount of such Security so converted at the time such Holder surrenders such Security for
conversion.

Securities shall be deemed to have been converted immediately prior to the close of business
on the day of surrender of such Securities for conversion in accordance with the foregoing
provisions, and at such time the rights of the Holders of such Securities as Holders shall cease
(and all obligations of the Company with respect thereto shall be deemed satisfied, including with
respect to the principal amount and any accrued and unpaid interest, including ay Additional
Interest), and the Person or Persons entitled to receive the Common Stock issuable upon conversion
shall be treated for all purposes as the record holder or holders of such Common Stock at such
time. As promptly as practicable on or after the conversion date, the Company shall cause to be
issued and delivered to such Conversion Agent a certificate or certificates for the number of full
shares of Common Stock issuable upon conversion, together with payment in lieu of any fraction of a
share as provided in Section 12.3 hereof.

In the case of any Security which is converted in part only, upon such conversion the Company
shall execute and the Trustee shall authenticate and deliver to the Holder thereof, at the expense
of the Company, a new Security or Securities of authorized denominations in aggregate principal
amount equal to the unconverted portion of the principal amount of such Securities.

The Company hereby initially appoints the Trustee as the Conversion Agent.

SECTION 12.3. Fractions of Shares. No fractional shares of Common Stock shall be
issued upon conversion of any Security or Securities. If more than one Security shall be
surrendered for conversion at one time by the same Holder, the number of full shares which shall be
issued upon conversion thereof shall be computed on the basis of the aggregate principal amount of
the Securities (or specified portions thereof) so surrendered. Instead of any fractional share of
Common Stock which would otherwise be issued upon conversion of any Security or Securities (or
specified portions thereof), the Company shall pay a cash adjustment in respect of such fraction
(calculated to the nearest one-100th of a share) in an amount equal to the same fraction of the
Quoted Price of the Common Stock as of the Trading Day preceding the date of conversion.

SECTION 12.4. Adjustment of Conversion Rate. The Conversion Rate shall be subject to
adjustments, calculated by the Company, from time to time as follows:

(a) In case the Company shall hereafter pay a dividend or make a distribution to all holders
of the outstanding Common Stock in shares of Common Stock, the Conversion Rate in effect at the
opening of business on the date following the date fixed for the determination of stockholders
entitled to receive such dividend or other distribution shall be increased by multiplying such
Conversion Rate by a fraction:

(i) the numerator of which shall be the number of shares of Common Stock outstanding at the
close of business on the Record Date (as defined in Section 12.4(g)) fixed for such determination
and the total number of shares constituting such dividend or other distribution, and

(ii) the denominator of which shall be the number of shares of Common Stock outstanding at the
close of business on the Record Date (as defined in Section 12.4(g)) fixed for such determination.

Such increase shall become effective immediately after the opening of business on the day
following the Record Date. If any dividend or distribution of the type described in this Section
12.4(a) is declared but not so paid or made, the Conversion Rate shall again be adjusted to the
Conversion Rate which would then be in effect if such dividend or distribution had not been
declared.

(b) In case the outstanding shares of Common Stock shall be subdivided into a greater number
of shares of Common Stock, the Conversion Rate in effect at the opening of business on the day
following the day upon which such subdivision becomes effective shall be proportionately increased,
and conversely, in case outstanding shares of Common Stock shall be combined into a smaller number
of shares of Common Stock, the Conversion Rate in effect at the opening of business on the day
following the day upon which such combination becomes effective shall be proportionately reduced,
such increase or reduction, as the case may be, to become effective immediately after the opening
of business on the day following the day upon which such subdivision or combination becomes
effective.

(c) In case the Company shall issue rights or warrants exercisable for no more than 45 days
(other than any rights or warrants referred to in Section 12.4(d)) to all or substantially all
holders of its outstanding shares of Common Stock entitling them to subscribe for or purchase
shares of Common Stock (or securities convertible into Common Stock) at a price per share (or
having a conversion price per share) less than the Current Market Price (as defined in Section
12.4(g)) on the Record Date fixed for the determination of stockholders entitled to receive such
rights or warrants, the Conversion Rate shall be increased so that the same shall equal the rate
determined by multiplying the Conversion Rate in effect at the opening of business on the date
after such Record Date by a fraction:

(i) the numerator of which shall be the number of shares of Common Stock outstanding on the
close of business on the Record Date plus the total number of additional shares of Common Stock so
offered for subscription or purchase (or into which the convertible securities so offered are
convertible), and

(ii) the denominator of which shall be the number of shares of Common Stock outstanding at the
close of business on the Record Date plus the number of shares which the aggregate offering price
of the total number of shares so offered for subscription or purchase (or the aggregate conversion
price of the convertible securities so offered) would purchase at such Current Market Price.

Such adjustment shall become effective immediately after the opening of business on the day
following the Record Date fixed for determination of stockholders entitled to receive such rights
or warrants. To the extent that shares of Common Stock (or securities convertible into Common
Stock) are not delivered pursuant to such rights or warrants, upon the expiration or termination of
such rights or warrants the Conversion Rate shall be readjusted to the Conversion Rate which would
then be in effect had the adjustments made upon the issuance of such rights or warrants been made
on the basis of the delivery of only the number of shares of Common Stock (or securities
convertible into Common Stock) actually delivered. In the event that such rights or warrants are
not so issued, the Conversion Rate shall again be adjusted to be the Conversion Rate which would
then be in effect if such date fixed for the determination of stockholders entitled to receive such
rights or warrants had not been fixed. In determining whether any rights or warrants entitle the
holders to subscribe for or purchase shares of Common Stock at less than such Current Market Price,
and in determining the aggregate offering price of such shares of Common Stock, there shall be
taken into account any consideration received for such rights or warrants, the value of such
consideration if other than cash, to be determined by the Board of Directors.

(d) In case the Company shall, by dividend or otherwise, distribute to all or substantially
all holders of its Common Stock shares of any class of capital stock of the Company (other than any
dividends or distributions to which Section 12.4(a) applies) or evidences of its indebtedness, cash
or other assets, including securities, but excluding (1) any rights or warrants referred to in
Section 12.4(c), (2) any stock, securities or other property or assets (including cash) distributed
in connection with a reclassification, change, merger, consolidation, statutory share exchange,
combination, sale or conveyance to which Section 12.11 hereof applies and (3) dividends and
distributions paid exclusively in cash (the securities described in foregoing clauses (1), (2) and
(3) hereinafter in this Section 12.4(d) called the “securities”), then, in each such case, subject
to the second succeeding paragraph of this Section 12.4(d), the Conversion Rate shall be increased
so that the same shall be equal to the rate determined by multiplying the Conversion Rate in effect
immediately prior to the close of business on the Record Date (as defined in Section 12.4(g)) with
respect to such distribution by a fraction:

(i) the numerator of which shall be the Current Market Price (determined as provided in
Section 12.4(g)) on such date, and

(ii) the denominator of which shall be such Current Market Price on such date less the fair
market value (as determined by the Board of Directors (except as described below), whose
determination shall be conclusive and set forth in a Board Resolution) on such date of the portion
of the shares of capital stock, evidences of indebtedness, cash or other assets, including
securities, so distributed applicable to one share of Common Stock (determined on the basis of the
number of shares of the Common Stock outstanding on the Record Date).

Such increase shall become effective immediately prior to the opening of business on the day
following the Record Date, or in the case of a Spin-off, immediately prior to the opening of
business on the day following the last Trading Day of the Measurement Period. However, in the
event that the then fair market value (as so determined) of the portion of the securities so
distributed applicable to one share of Common Stock is equal to or greater than the Current Market
Price on the Record Date, in lieu of the foregoing adjustment, adequate provision shall be made so
that each Holder shall have the right to receive upon conversion of a Security (or any portion
thereof) the amount of shares of capital stock, evidences of indebtedness, cash or other assets,
including securities, such Holder would have received had such Holder converted such Security (or
portion thereof) immediately prior to such Record Date. In the event that such dividend or
distribution is not so paid or made, the Conversion Rate shall again be adjusted to be the
Conversion Rate which would then be in effect if such dividend or distribution had not been
declared.

If the Board of Directors determines the fair market value of any distribution for purposes of
this Section 12.4(d) by reference to the actual or when issued trading market for any securities
comprising all or part of such distribution, it must in doing so consider the prices in such market
over the same period (the “Reference Period”) used in computing the Current Market Price pursuant
to Section 12.4(g) to the extent possible, unless the Board of Directors in a Board Resolution
determines in good faith that determining the fair market value during the Reference Period would
not be in the best interest of the Holder.

In the event the Company distributes shares of capital stock of a Subsidiary or other business
unit of the Company, the Conversion Rate will be adjusted, if at all, so that the same shall be
equal to the rate determined by multiplying the Conversion Rate in effect immediately prior to the
close of business on the Record Date (as defined in Section 12.4(g)) with respect to such
distribution by a fraction:

(iii) the numerator of which shall be the Current Market Price (determined as described below)
on such date plus the fair market value on such date of the portion of the shares of capital stock
of such Subsidiary or other business unit of the Company so distributed applicable to one share of
Common Stock (determined on the basis of the number of shares of the Common Stock outstanding on
the Record Date), and

(iv) the denominator of which shall be such Current Market Price on such date (determined as
described below).

In respect of a dividend or other distribution of shares of capital stock of a class or
series, or similar equity interest, of or relating to a Subsidiary or other business unit of the
Company which has a Subsidiary Closing Price (a “Spin-off”), the fair market value of the
securities to be distributed shall equal the average of the daily Subsidiary Closing Price of such
securities for the ten (10) consecutive Trading Days commencing on and including the fifth Trading
Day of such securities after the effectiveness of the Spin-off (the “Measurement Period”) and the
Current Market Price shall be calculated over the same Measurement Period; provided, however, that
in the event that an underwritten initial public offering of the securities in the Spin-off occurs
simultaneously with the Spin-off, fair market value of the securities distributed in the Spin-off
shall be the initial public offering price of such securities and the market price per share of the
Common Stock shall mean the Closing Price for the Common Stock on the same Trading Day.

Rights or warrants distributed by the Company to all holders of Common Stock entitling the
holders thereof to subscribe for or purchase shares of the Company’s capital stock (either
initially or under certain circumstances), which rights or warrants, until the occurrence of a
specified event or events (“Trigger Event”):

(v) are deemed to be transferred with such shares of Common Stock,

(vi) are not exercisable, and

(vii) are also issued in respect of future issuances of Common Stock

shall be deemed not to have been distributed for purposes of this Section 12.4(d) (and no
adjustment to the Conversion Rate under this Section 12.4(d) will be required) until the occurrence
of the earliest Trigger Event. If such right or warrant is subject to subsequent events, upon the
occurrence of which such right or warrant shall become exercisable to purchase different
securities, evidences of indebtedness or other assets or entitle the holder to purchase a different
number or amount of the foregoing or to purchase any of the foregoing at a different purchase
price, then the occurrence of each such event shall be deemed to be the date of issuance and record
date with respect to a new right or warrant (and a termination or expiration of the existing right
or warrant without exercise by the holder thereof). In addition, in the event of any distribution
(or deemed distribution) of rights or warrants, or any Trigger Event or other event (of the type
described in the preceding sentence) with respect thereto, that resulted in an adjustment to the
Conversion Rate under this Section 12.4(d):

(1) in the case of any such rights or warrants which shall all have been repurchased without
exercise by any holders thereof, the Conversion Rate shall be readjusted upon such final repurchase
to give effect to such distribution or Trigger Event, as the case may be, as though it were a cash
distribution, equal to the per share repurchase price received by a holder of Common Stock with
respect to such rights or warrant (assuming such holder had retained such rights or warrants), made
to all holders of Common Stock as of the date of such repurchase, and

(2) in the case of such rights or warrants all of which shall have expired or been terminated
without exercise, the Conversion Rate shall be readjusted as if such rights and warrants had never
been issued.

For purposes of this Section 12.4(d) and Sections 12.4(a), 12.4(b) and 12.4(c), any dividend
or distribution to which this Section 12.4(d) is applicable that also includes shares of Common
Stock, a subdivision or combination of Common Stock to which Section 12.4(b) applies, or rights or
warrants to subscribe for or purchase shares of Common Stock to which Section 12.4(c) applies (or
any combination thereof), shall be deemed instead to be:

(3) a dividend or distribution of the evidences of indebtedness, assets, shares of capital
stock, rights or warrants other than such shares of Common Stock, such subdivision or combination
or such rights or warrants to which Sections 12.4(a), 12.4(b) and 12.4(c) apply, respectively (and
any Conversion Rate increase required by this Section 12.4(d) with respect to such dividend or
distribution shall then be made), immediately followed by

(4) a dividend or distribution of such shares of Common Stock, such subdivision or combination
or such rights or warrants (and any further Conversion Rate increase required by Sections 12.4(a),
12.4(b) and 12.4(c) with respect to such dividend or distribution shall then be made), except:

	 	(A)	 	the Record Date of such dividend or distribution shall be substituted as (x) “the date fixed
for the determination of stockholders entitled to receive such dividend or other
distribution”, “Record Date fixed for such determination” and “Record Date” within the meaning
of Section 12.4(a), (y) “the day upon which such subdivision becomes effective” and “the day
upon which such combination becomes effective” within the meaning of Section 12.4(b), and (z)
“the Record Date fixed for the determination of stockholders entitled to receive such rights
or warrants,” such “Record Date,” “the Record Date fixed for the determination of stockholders
entitled to receive such rights or warrants” and “such date fixed for the determination of
stockholders entitled to receive such rights or warrants” within the meaning of Section
12.4(c), and

	 	(B)	 	any shares of Common Stock included in such dividend or distribution shall not be deemed
“outstanding at the close of business on the Record Date fixed for such determination” within
the meaning of Section 12.4(a) and any reduction or increase in the number of shares of Common
Stock resulting from such subdivision or combination shall be disregarded in connection with
such dividend or distribution.

(e) In case the Company shall, by dividend or otherwise, distribute to all or substantially
all holders of its Common Stock cash (excluding any cash that is distributed upon a
reclassification, change, merger, consolidation, statutory share exchange, combination, sale or
conveyance to which Section 12.11 hereof applies or as part of a distribution referred to in
Section 12.4(d) hereof), then and in each such case, immediately after the close of business on
such date, the Conversion Rate shall be increased so that the same shall equal the rate determined
by multiplying the Conversion Rate in effect immediately prior to the close of business on such
Record Date by a fraction:

(i) the numerator of which shall be equal to the Current Market Price on the Record Date, and

(ii) the denominator of which shall be equal to the Current Market Price on such date less an
amount equal to the quotient of (x) the sum of the aggregate amount of cash so distributed and (y)
the number of shares of Common Stock outstanding on the Record Date.

In the event that such dividend or distribution is not so paid or made, the Conversion Rate
shall again be adjusted to be the Conversion Rate which would then be in effect if such dividend or
distribution had not been declared.

(f) In case a tender or exchange offer made by the Company or any of its subsidiaries for all
or any portion of the Common Stock shall expire, then, and in each such case, immediately prior to
the opening of business on the day after the date of the last time (the “Expiration Time”) tenders
could have been made pursuant to such tender or exchange offer, the Conversion Rate shall be
adjusted so that the same shall equal the rate determined by multiplying the Conversion Rate in
effect immediately prior to close of business on the date of the Expiration Time by a fraction:

(i) the numerator of which shall be the sum of (x) the fair market value (determined as
aforesaid) of the aggregate consideration payable to stockholders based on the acceptance (up to
any maximum specified in the terms of the tender or exchange offer) of all shares validly tendered
or exchanged and not withdrawn as of the Expiration Time (the shares deemed so accepted, up to any
such maximum, being referred to as the “Purchased Shares”) and (y) the product of the number of
shares of Common Stock outstanding (less any Purchased Shares) on the Expiration Time and the
Current Market Price of the Common Stock on the Trading Day next succeeding the Expiration Time,
and

(ii) the denominator shall be (x) the number of shares of Common Stock outstanding (including
any tendered or exchanged shares) at the Expiration Time multiplied by the Current Market Price of
the Common Stock on the Trading Day next succeeding the Expiration Time.

Such increase (if any) shall become effective immediately prior to the opening of business on
the day following the Expiration Time. In the event that the Company is obligated to purchase
shares pursuant to any such tender offer, but the Company is permanently prevented by applicable
law from effecting any such purchases or all such purchases are rescinded, the Conversion Rate
shall again be adjusted to be the Conversion Rate which would then be in effect if such tender or
exchange offer had not been made. If the application of this Section 12.4(f) to any tender or
exchange offer would result in a decrease in the Conversion Rate, no adjustment shall be made for
such tender or exchange offer under this Section 12.4(f).

(g) For purposes of this Section 12.4, the following terms shall have the meanings indicated:

(1) “Current Market Price” shall mean the average of the daily Closing Prices per share of
Common Stock for the ten (10) consecutive Trading Days immediately prior to the date in question;
provided, however, that if:

(ii) the “ex” date (as hereinafter defined) for any event (other than the issuance or
distribution requiring such computation) that requires an adjustment to the Conversion Rate
pursuant to Section 12.4(a), (b), (c), (d), (e) or (f) occurs during such ten consecutive Trading
Days, the Closing Price for each Trading Day prior to the “ex” date for such other event shall be
adjusted by dividing such Closing Price by the same fraction by which the Conversion Rate is so
required to be adjusted as a result of such other event;

(iii) the “ex” date for any event (other than the issuance or distribution requiring such
computation) that requires an adjustment to the Conversion Rate pursuant to Section 12.4(a), (b),
(c), (d), (e) or (f) occurs on or after the “ex” date for the issuance or distribution requiring
such computation and prior to the day in question, the Closing Price for each Trading Day on and
after the “ex” date for such other event shall be adjusted by dividing such Closing Price by the
reciprocal of the fraction by which the Conversion Rate is so required to be adjusted as a result
of such other event; and

(iv) the “ex” date for the issuance or distribution requiring such computation is prior to the
day in question, after taking into account any adjustment required pursuant to clause (i) or (ii)
of this proviso, the Closing Price for each Trading Day on or after such “ex” date shall be
adjusted by adding thereto the amount of any cash and the fair market value (as determined by the
Board of Directors in a manner consistent with any determination of such value for purposes of
Section 12.4(d) or (f), whose determination shall be conclusive and set forth in a Board
Resolution) of the evidences of indebtedness, shares of capital stock or assets being distributed
applicable to one share of Common Stock as of the close of business on the day before such “ex”
date.

For purposes of any computation under Section 12.4(f), the Current Market Price of the Common
Stock on any date shall be deemed to be the average of the daily Closing Prices per share of Common
Stock for such day and the next two succeeding Trading Days; provided, however, that if the “ex”
date for any event (other than the tender offer requiring such computation) that requires an
adjustment to the Conversion Rate pursuant to Section 12.4(a), (b), (c), (d), (e) or (f) occurs on
or after the Expiration Time for the tender or exchange offer requiring such computation and prior
to the day in question, the Closing Price for each Trading Day on and after the “ex” date for such
other event shall be adjusted by dividing such Closing Price by the reciprocal of the fraction by
which the Conversion Rate is so required to be adjusted as a result of such other event. For
purposes of this paragraph, the term “ex” date, when used:

	 	(A)	 	with respect to any issuance or distribution, means the first date on which the Common Stock
trades regular way on the relevant exchange or in the relevant market from which the Closing
Price was obtained without the right to receive such issuance or distribution;

	 	(B)	 	with respect to any subdivision or combination of shares of Common Stock, means the first
date on which the Common Stock trades regular way on such exchange or in such market after the
time at which such subdivision or combination becomes effective, and

	 	(C)	 	with respect to any tender or exchange offer, means the first date on which the Common Stock
trades regular way on such exchange or in such market after the Expiration Time of such offer.

Notwithstanding the foregoing, whenever successive adjustments to the Conversion Rate are
called for pursuant to this Section 12.4, such adjustments shall be made to the Current Market
Price as may be necessary or appropriate to effectuate the intent of this Section 12.4 and to avoid
unjust or inequitable results as determined in good faith by the Board of Directors.

(2) “fair market value” shall mean the amount which a willing buyer would pay a willing seller
in an arm’s length transaction.

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

(h) The Company may make such increases in the Conversion Rate, in addition to those required
by Section 12.4(a), (b), (c), (d), (e) or (f), as the Board of Directors considers to be advisable
to avoid or diminish any income tax to holders of Common Stock or rights to purchase Common Stock
resulting from any dividend or distribution of stock (or rights to acquire stock) or from any event
treated as such for income tax purposes.

To the extent permitted by applicable law, the Company from time to time may increase the
Conversion Rate by any amount for any period of time if the period is at least 20 days and the
increase is irrevocable during the period and the Board of Directors determines in good faith that
such increase would be in the best interests of the Company, which determination shall be
conclusive and set forth in a Board Resolution; provided, however, that in no event may the Company
increase the Conversion Rate such that it causes the Conversion Price to be less than the par value
of a share of Common Stock. Whenever the Conversion Rate is increased pursuant to the preceding
sentence, the Company shall mail to the Trustee and each Holder at the address of such Holder as it
appears in the Register a notice of the increase at least 15 days prior to the date the increased
Conversion Rate takes effect, and such notice shall state the increased Conversion Rate and the
period during which it will be in effect.

(i) All calculations under this Article 12 shall be made by the Company and shall be made to
the nearest cent or to the nearest one-ten-thousandth (1/10,000) of a share, as the case may be.
No adjustment need be made for a change in the par value or no par value of the Common Stock.

(j) In any case in which this Section 12.4 provides that an adjustment shall become effective
immediately after a Record Date for an event, the Company may defer until the occurrence of such
event (i) issuing to the Holder of any Security converted after such Record Date and before the
occurrence of such event the additional shares of Common Stock issuable upon such conversion by
reason of the adjustment required by such event over and above the Common Stock issuable upon such
conversion before giving effect to such adjustment and (ii) paying to such holder any amount in
cash in lieu of any fraction pursuant to Section 12.3 hereof.

(k) For purposes of this Section 12.4, the number of shares of Common Stock at any time
outstanding shall not include shares held in the treasury of the Company but shall include shares
issuable in respect of scrip certificates issued in lieu of fractions of shares of Common Stock.
The Company will not pay any dividend or make any distribution on shares of Common Stock held in
the treasury of the Company.

(l) To the extent the Company has a Rights Plan in effect upon conversion of the Securities
pursuant to this Article 12: (i) if such Rights have not separated from the Common Stock prior to
the conversion of the Securities, each share of Common Stock issued upon conversion of the
Securities pursuant to this Article 12 shall be entitled to receive the appropriate number of
Rights, if any, and the certificates representing the Common Stock issued upon such conversion
shall bear such legends, if any, in each case as may be provided by the terms of any Rights Plan;
or (ii) if such Rights have separated from the Common Stock prior to the conversion of the
Securities, the Conversion Rate will be adjusted as though the Rights were being distributed to all
holders of Common Stock on the date of such separation. If such an adjustment is made and the
Rights are later redeemed, invalidated or terminated, then a corresponding reversing adjustment
will be made to the Conversion Rate on an equitable basis.

SECTION 12.5. Notice of Adjustments of Conversion Rate. Whenever the Conversion Rate
is adjusted as herein provided (other than in the case of an adjustment pursuant to the second
paragraph of Section 12.4(h) for which the notice required by such paragraph has been provided),
the Company shall promptly file with the Trustee and any Conversion Agent other than the Trustee an
Officers’ Certificate setting forth the adjusted Conversion Rate and showing in reasonable detail
the facts upon which such adjustment is based. Promptly after delivery of such Officers’
Certificate, the Company shall prepare a notice stating that the Conversion Rate has been adjusted
and setting forth the adjusted Conversion Rate and the date on which each adjustment becomes
effective, and shall mail such notice to each Holder at the address of such Holder as it appears in
the Register within 20 days of the effective date of such adjustment. If any adjustment to the
Conversion Rate would be less than 1% of the then effective Conversion Rate, such adjustment shall
be carried forward and adjustment with respect thereto shall be made at the time of and together
with any subsequent adjustments which, together with the original adjustment, shall aggregate at
least 1% of the then effective Conversion Rate; provided, however, that any carryforward amount
will be paid to the Holder upon conversion regardless of the 1% threshold. Failure to deliver such
notice shall not affect the legality or validity of any such adjustment.

SECTION 12.6. Notice Prior to Certain Actions. In case at any time after the date
hereof:

(1) the Company shall declare a dividend (or any other distribution) on its Common Stock
payable otherwise than in cash out of its capital surplus or its consolidated retained earnings;

(2) the Company shall authorize the granting to the holders of its Common Stock of rights or
warrants to subscribe for or purchase any shares of capital stock of any class (or of securities
convertible into shares of capital stock of any class) or of any other rights;

(3) there shall occur any reclassification of the Common Stock of the Company (other than a
subdivision or combination of its outstanding Common Stock, a change in par value, a change from
par value to no par value or a change from no par value to par value), or any merger,
consolidation, statutory share exchange or combination to which the Company is a party and for
which approval of any shareholders of the Company is required, or the sale, transfer or conveyance
of all or substantially all of the assets of the Company; or

(4) there shall occur the voluntary or involuntary dissolution, liquidation or winding up of
the Company;

the Company shall cause to be filed at each office or agency maintained for the purpose of
conversion of securities pursuant to Section 9.2 hereof, and shall cause to be provided to the
Trustee and all Holders in accordance with Section 14.2 hereof, at least 20 days (or 10 days in any
case specified in clause (1) or (2) above) prior to the applicable record or effective date
hereinafter specified, a notice stating:

	 	(A)	 	the date on which a record is to be taken for the purpose of such dividend, distribution,
rights or warrants, or, if a record is not to be taken, the date as of which the holders of
Common Stock of record to be entitled to such dividend, distribution, rights or warrants are
to be determined, or

	 	(B)	 	the date on which such reclassification, merger, consolidation, statutory share exchange,
combination, sale, transfer, conveyance, dissolution, liquidation or winding up is expected to
become effective, and the date as of which it is expected that holders of Common Stock of
record shall be entitled to exchange their shares of Common Stock for securities, cash or
other property deliverable upon such reclassification, merger, consolidation, statutory share
exchange, sale, transfer, dissolution, liquidation or winding up.

Neither the failure to give such notice nor any defect therein shall affect the legality or
validity of the proceedings or actions described in clauses (1) through (4) of this Section 12.6.

SECTION 12.7. Company to Reserve Common Stock. The Company shall at all times use its
best efforts to reserve and keep available, free from preemptive rights, out of its authorized but
unissued Common Stock, for the purpose of effecting the conversion of Securities, the full number
of shares of fully paid and nonassessable Common Stock then issuable upon the conversion of all
Outstanding Securities, including pursuant to any Make-Whole Premium.

SECTION 12.8. Taxes on Conversions. Except as provided in the next sentence, the
Company will pay any and all taxes (other than taxes on income) and duties that may be payable in
respect of the issue or delivery of shares of Common Stock on conversion of Securities pursuant
hereto. A Holder delivering a Security for conversion shall be liable for and will be required to
pay any tax or duty which may be payable in respect of any transfer involved in the issue and
delivery of shares of Common Stock in a name other than that of the Holder of the Security or
Securities to be converted, and no such issue or delivery shall be made unless the Person
requesting such issue has paid to the Company the amount of any such tax or duty, or has
established to the satisfaction of the Company that such tax or duty has been paid.

SECTION 12.9. Covenant as to Common Stock. The Company covenants that all shares of
Common Stock which may be issued upon conversion of Securities will upon issue be fully paid and
nonassessable and, except as provided in Section 12.8, the Company will pay all taxes, liens and
charges with respect to the issue thereof.

SECTION 12.10. Cancellation of Converted Securities. All Securities delivered for
conversion shall be delivered to the Trustee to be canceled by or at the direction of the Trustee,
which shall dispose of the same as provided in Section 2.15.

SECTION 12.11. Effect of Recapitalization, Reclassification, Consolidation, Merger or
Sale. If any of following events occur, namely:

(i) any recapitalization, reclassification or change of the outstanding shares of Common Stock
(other than a change in par value, or from par value to no par value, or from no par value to par
value, or as a result of a subdivision or combination),

(ii) any merger, consolidation, statutory share exchange or combination of the Company with
another corporation as a result of which holders of Common Stock shall be entitled to receive
stock, securities or other property or assets (including cash) with respect to or in exchange for
such Common Stock or

(iii) any sale, conveyance or lease of the properties and assets of the Company as, or
substantially as, an entirety to any other corporation as a result of which holders of Common Stock
shall be entitled to receive stock, securities or other property or assets (including cash) with
respect to or in exchange for such Common Stock,

the Company or the successor or purchasing corporation, as the case may be, shall execute with the
Trustee a supplemental indenture (which shall comply with the TIA as in force at the date of
execution of such supplemental indenture if such supplemental indenture is then required to so
comply) providing that each Security shall be convertible into the kind and amount of shares of
stock and other securities or property or assets (including cash) which such Holder would have been
entitled to receive upon such recapitalization, reclassification, change, merger, consolidation,
statutory share exchange, combination, sale or conveyance had such Securities been converted into
Common Stock immediately prior to such recapitalization, reclassification, change, merger,
consolidation, statutory share exchange, combination, sale or conveyance assuming such holder of
Common Stock did not exercise its rights of election, if any, as to the kind or amount of
securities, cash or other property receivable upon such recapitalization, reclassification, change,
merger, consolidation, statutory share exchange, combination, sale or conveyance. In the event
holders of Common Stock have the opportunity to elect the form of consideration to be received in
such recapitalization, reclassification, change, merger, consolidation, statutory share exchange,
combination, sale or conveyance, Holders shall have a reasonable opportunity to determine the form
of consideration into which all of the Securities, treated as a single class, shall be convertible
from and after the effective date of such recapitalization, reclassification, change, merger,
consolidation, statutory share exchange, combination, sale or conveyance. Such determination shall
be based on the weighted average of elections made by Holders who participate in such
determination, shall be subject to any limitations to which all of the holders of Common Stock are
subject, including, but not limited to, pro-rata reductions applicable to any portion of the
consideration payable in such recapitalization, reclassification, change, merger, consolidation,
statutory share exchange, combination, sale or conveyance and shall be conducted in such a manner
as to be completed by the date which is the earliest of (a) the deadline for elections to be made
by holders of our Common Stock, and (b) two trading days prior to the anticipated effective date.
Such supplemental indenture shall provide for adjustments which shall be as nearly equivalent as
may be practicable to the adjustments provided for in this Article 12. If, in the case of any such
recapitalization, reclassification, change, merger, consolidation, statutory share exchange,
combination, sale or conveyance, the stock or other securities and assets receivable thereupon by a
holder of shares of Common Stock includes shares of stock or other securities and assets of a
corporation other than the successor or purchasing corporation, as the case may be, in such
recapitalization, reclassification, change, merger, consolidation, statutory share exchange,
combination, sale or conveyance, then such supplemental indenture shall also be executed by such
other corporation and shall contain such additional provisions to protect the interests of the
Holders of the Securities as the Board of Directors shall reasonably consider necessary by reason
of the foregoing, including to the extent practicable the provisions providing for the repurchase
rights set forth in Article 11 hereof.

The Company shall cause notice of the execution of such supplemental indenture to be mailed to
each Holder, at the address of such Holder as it appears on the Register, within 20 days after
execution thereof. Failure to deliver such notice shall not affect the legality or validity of
such supplemental indenture.

The above provisions of this Section shall similarly apply to successive recapitalizations,
reclassifications, mergers, consolidations, statutory share exchanges, combinations, sales and
conveyances.

If this Section 12.11 applies to any event or occurrence, Section 12.4 hereof shall not apply.

SECTION 12.12. Responsibility of Trustee for Conversion Provisions. The Trustee,
subject to the provisions of Section 5.1 hereof, and any Conversion Agent shall not at any time be
under any duty or responsibility to any Holder of Securities to determine whether any facts exist
which may require any adjustment of the Conversion Rate, or with respect to the nature or intent of
any such adjustments when made, or with respect to the method employed, or herein or in any
supplemental indenture provided to be employed, in making the same. Neither the Trustee, subject
to the provisions of Section 5.1 hereof, nor any Conversion Agent shall be accountable with respect
to the validity or value (of the kind or amount) of any Common Stock, or of any other securities or
property, which may at any time be issued or delivered upon the conversion of any Security; and it
or they do not make any representation with respect thereto. Neither the Trustee, subject to the
provisions of Section 5.1 hereof, nor any Conversion Agent shall be responsible for any failure of
the Company to make any cash payment or to issue, transfer or deliver any shares of stock or share
certificates or other securities or property upon the surrender of any Security for the purpose of
conversion; and the Trustee, subject to the provisions of Section 5.1 hereof, and any Conversion
Agent shall not be responsible or liable for any failure of the Company to comply with any of the
covenants of the Company contained in this Article.

SECTION 12.13. Make-Whole Premium

(a) If a Fundamental Change Effective Date occurs on or prior to September 27, 2012, other
than in connection with a Fundamental Change described in clause (3) of the definition of “Change
of Control,” Holders who convert Securities in accordance with the provisions of Section 11.3(a) in
connection with a Fundamental Change shall, subject to Section 12.13, be entitled to receive a
“Make-Whole Premium” consisting of an increase in the Conversion Rate. The Make-Whole Premium
shall be calculated by the Company and paid for in shares of Common Stock or in any other
consideration into which the Securities are then convertible. The number of additional shares of
Common Stock by which the Conversion Rate shall increase shall be determined by reference to the
table below and shall equal the number of shares of Common Stock for the applicable Fundamental
Change Effective Date and Stock Price of such Fundamental Change. If the applicable Fundamental
Change Effective Date and/or Stock Price is not set forth in the table: (i) if the applicable
Fundamental Change Effective Date and/or Stock Price is between two Fundamental Change Effective
Dates or Stock Prices, as the case may be, set forth in the table, the Make-Whole Premium shall be
determined by a straight-line interpolation between the Make-Whole Premiums set forth for the two
Fundamental Change Effective Dates and/or Stock Prices, as the case may be, set forth in the table
based on a 365-day year, (ii) if the Stock Price on the Fundamental Change Effective Date exceeds
$150.00 a share, subject to adjustment as set forth herein, no Make-Whole Premium shall be paid,
and (iii) if the Stock Price on the Fundamental Change Effective Date is less than $33.20 a share,
subject to adjustment as set forth herein, no Make-Whole Premium shall be paid.

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 	 	Effective Date
	 	 	Sept. 27,	 	Sept. 27,	 	Sept. 27,	 	Sept. 27,	 	Sept. 27,	 	Sept. 27,	 	Sept. 27,	 	Sept. 27,
	Stock Price	 	2005	 	2006	 	2007	 	2008	 	2009	 	2010	 	2011	 	2012
	$33.20
	 	 	6.0241	 	 	 	6.0241	 	 	 	6.0241	 	 	 	6.0241	 	 	 	6.0241	 	 	 	6.0241	 	 	 	6.0241	 	 	 	0.0000	 
	$35.00
	 	 	5.3663	 	 	 	5.4317	 	 	 	5.4827	 	 	 	5.5196	 	 	 	5.4980	 	 	 	5.4071	 	 	 	5.1023	 	 	 	0.0000	 
	$40.00
	 	 	3.9403	 	 	 	3.9370	 	 	 	3.9119	 	 	 	3.8519	 	 	 	3.7179	 	 	 	3.4840	 	 	 	2.9673	 	 	 	0.0000	 
	$45.00
	 	 	3.4086	 	 	 	3.0427	 	 	 	2.8278	 	 	 	2.7173	 	 	 	2.5313	 	 	 	2.2396	 	 	 	1.6759	 	 	 	0.0000	 
	$50.00
	 	 	3.0699	 	 	 	2.7385	 	 	 	2.3796	 	 	 	1.9842	 	 	 	1.7200	 	 	 	1.4240	 	 	 	0.9057	 	 	 	0.0000	 
	$55.00
	 	 	2.7942	 	 	 	2.4892	 	 	 	2.1626	 	 	 	1.8050	 	 	 	1.4095	 	 	 	0.9814	 	 	 	0.5113	 	 	 	0.0000	 
	$60.00
	 	 	2.5562	 	 	 	2.2871	 	 	 	1.9819	 	 	 	1.6536	 	 	 	1.2955	 	 	 	0.8993	 	 	 	0.4688	 	 	 	0.0000	 
	$65.00
	 	 	2.3575	 	 	 	2.1098	 	 	 	1.8326	 	 	 	1.5253	 	 	 	1.1938	 	 	 	0.8324	 	 	 	0.4328	 	 	 	0.0000	 
	$70.00
	 	 	2.1898	 	 	 	1.9526	 	 	 	1.7009	 	 	 	1.4194	 	 	 	1.1097	 	 	 	0.7709	 	 	 	0.4019	 	 	 	0.0000	 
	$75.00
	 	 	2.0466	 	 	 	1.8235	 	 	 	1.5812	 	 	 	1.3275	 	 	 	1.0366	 	 	 	0.7206	 	 	 	0.3750	 	 	 	0.0000	 
	$80.00
	 	 	1.9151	 	 	 	1.7120	 	 	 	1.4840	 	 	 	1.2347	 	 	 	0.9740	 	 	 	0.6749	 	 	 	0.3512	 	 	 	0.0000	 
	$85.00
	 	 	1.7994	 	 	 	1.6136	 	 	 	1.3987	 	 	 	1.1634	 	 	 	0.9073	 	 	 	0.6349	 	 	 	0.3296	 	 	 	0.0000	 
	$90.00
	 	 	1.7013	 	 	 	1.5173	 	 	 	1.3225	 	 	 	1.1005	 	 	 	0.8578	 	 	 	0.5993	 	 	 	0.3105	 	 	 	0.0000	 
	$95.00
	 	 	1.6157	 	 	 	1.4383	 	 	 	1.2506	 	 	 	1.0441	 	 	 	0.8144	 	 	 	0.5677	 	 	 	0.2940	 	 	 	0.0000	 
	$100.00
	 	 	1.5370	 	 	 	1.3693	 	 	 	1.1858	 	 	 	0.9932	 	 	 	0.7761	 	 	 	0.5392	 	 	 	0.2790	 	 	 	0.0000	 
	$105.00
	 	 	1.4666	 	 	 	1.3063	 	 	 	1.1304	 	 	 	0.9409	 	 	 	0.7388	 	 	 	0.5137	 	 	 	0.2658	 	 	 	0.0000	 
	$110.00
	 	 	1.3991	 	 	 	1.2479	 	 	 	1.0824	 	 	 	0.9000	 	 	 	0.7056	 	 	 	0.4913	 	 	 	0.2531	 	 	 	0.0000	 
	$115.00
	 	 	1.3405	 	 	 	1.1948	 	 	 	1.0369	 	 	 	0.8617	 	 	 	0.6763	 	 	 	0.4688	 	 	 	0.2426	 	 	 	0.0000	 
	$120.00
	 	 	1.2859	 	 	 	1.1434	 	 	 	0.9931	 	 	 	0.8261	 	 	 	0.6470	 	 	 	0.4500	 	 	 	0.2335	 	 	 	0.0000	 
	$125.00
	 	 	1.2293	 	 	 	1.1009	 	 	 	0.9545	 	 	 	0.7958	 	 	 	0.6220	 	 	 	0.4329	 	 	 	0.2242	 	 	 	0.0000	 
	$130.00
	 	 	1.1812	 	 	 	1.0596	 	 	 	0.9168	 	 	 	0.7662	 	 	 	0.5989	 	 	 	0.4155	 	 	 	0.2145	 	 	 	0.0000	 
	$135.00
	 	 	1.1320	 	 	 	1.0207	 	 	 	0.8843	 	 	 	0.7381	 	 	 	0.5765	 	 	 	0.4018	 	 	 	0.2082	 	 	 	0.0000	 
	$140.00
	 	 	1.0941	 	 	 	0.9797	 	 	 	0.8525	 	 	 	0.7103	 	 	 	0.5571	 	 	 	0.3868	 	 	 	0.2009	 	 	 	0.0000	 
	$145.00
	 	 	1.0579	 	 	 	0.9411	 	 	 	0.8256	 	 	 	0.6871	 	 	 	0.5360	 	 	 	0.3746	 	 	 	0.1945	 	 	 	0.0000	 
	$150.00
	 	 	1.0229	 	 	 	0.9095	 	 	 	0.7924	 	 	 	0.6646	 	 	 	0.5202	 	 	 	0.3624	 	 	 	0.1881	 	 	 	0.0000	 

The Stock Prices set forth in the table above shall be adjusted as of any date on which the
Conversion Rate of the Securities is adjusted by multiplying each such Stock Price in effect
immediately prior to such adjustment by a fraction, the numerator of which shall be the Conversion
Rate in effect immediately prior to the adjustment giving rise to the Stock Price adjustment and
the denominator of which shall be the Conversion Rate as so adjusted. The number of additional
shares set forth in the table above shall be adjusted in the same manner as the Conversion Rate as
set forth in Section 12.4 hereof.

Delivery of the payment of the Make-Whole Premium shall be upon the later of (x) the
settlement date of the conversion of Securities by the Holder and (y) promptly following the
Fundamental Change Effective Date.

(b) A conversion of Securities by a Holder will be deemed for the purposes of this Section
12.13 to be “in connection with” a Fundamental Change if the conversion notice delivered by the
Holder pursuant to Section 12.2 hereof is received by a Conversion Agent (i) on or subsequent to
the date that is 20 Business Days prior to the date announced by the Company as the anticipated
Fundamental Change Effective Date but (ii) prior to the close of business on the Business Day
immediately preceding the related Repurchase Date. To the extent possible, the Company shall notify
the Holders of an anticipated Fundamental Change Effective Date at least 30 calendar days prior to
such Fundamental Change Effective Date.

(c) Notwithstanding any of the provisions of this Section 12.13, in no event shall the
Conversion Rate exceed 30.1205 shares per $1,000 principal amount of Securities (subject to
adjustment as provided herein).

ARTICLE 13

SUBORDINATION

SECTION 13.1. Securities Subordinated to Senior Debt. The Company covenants and
agrees, and each Holder of Securities, by such Holder’s acceptance thereof, likewise covenants and
agrees, that the Indebtedness represented by the Securities and the payment of the principal of and
premium, if any, and interest (including Additional Interest Amounts, if any) on each and all of
the Securities is hereby expressly subordinated and junior, to the extent and in the manner set
forth and as set forth in this Section 13.1, in right of payment to the prior payment in full of
all Senior Debt; provided, however, that the Securities, the Indebtedness represented thereby and
the payment of the principal of and premium, if any, and interest (including Additional Interest
Amounts, if any) on the Securities in all respects shall rank equally with, or prior to, all
existing and future Indebtedness of the Company that is expressly subordinated to any Senior Debt.

(a) In the event of any distribution of assets of the Company upon any dissolution, winding
up, liquidation or reorganization of the Company, whether in bankruptcy, insolvency, reorganization
or receivership proceedings or upon an assignment for the benefit of creditors or any other
marshalling of the assets and liabilities of the Company or otherwise, the holders of all Senior
Debt shall first be entitled to receive payment of the full amount due thereon in respect of all
such Senior Debt and all other amounts due or provision shall be made for such amount in cash, or
other payments satisfactory to the holders of Senior Debt, before the Holders of any of the
Securities are entitled to receive any payment or distribution of any character, whether in cash,
securities or other property, on account of the principal of or premium, if any, or interest
(including Additional Interest Amounts, if any) on the Securities.

(b) In the event of any acceleration of Maturity of the Securities because of an Event of
Default, unless the full amount due in respect of all Senior Debt is paid in cash or other form of
payment satisfactory to the holders of Senior Debt, no payment shall be made by the Company with
respect to the principal of, premium, if any, or interest on the Securities or to acquire any of
the Securities (including any conversion or cash repurchase pursuant to the exercise of the
Repurchase Right or otherwise), and the Company shall give prompt written notice of such
acceleration to such holders of Senior Debt.

(c) In the event of and during the continuance of any default in payment of the principal of
or premium, if any, or interest on, rent or other payment obligation in respect of, any Senior
Debt, unless all such payments due in respect of such Senior Debt have been paid in full in cash or
other payments satisfactory to the holders of Senior Debt, no payment shall be made by the Company
with respect to the principal of, premium, if any, or interest (including Additional Interest
Amounts, if any) on the Securities or to acquire any of the Securities (including any conversion or
cash repurchase pursuant to the exercise of the Repurchase Right). The Company shall give prompt
written notice to the Trustee of any default under any Senior Debt or under any agreement pursuant
to which Senior Debt may have been issued.

(d) During the continuance of any event of default with respect to any Designated Senior Debt,
as such event of default is defined under any such Designated Senior Debt or in any agreement
pursuant to which any Designated Senior Debt has been issued (other than a default in payment of
the principal of or premium, if any, or interest on, rent or other payment obligation in respect of
any Designated Senior Debt), permitting the holder or holders of such Designated Senior Debt to
accelerate the maturity thereof (or in the case of any lease, permitting the landlord either to
terminate the lease or to require the Company to make an irrevocable offer to terminate the lease
following an event of default thereunder), no payment shall be made by the Company, directly or
indirectly, with respect to principal of, premium, if any, or interest (including Additional
Interest Amounts, if any) on the Securities for 179 days following notice in writing (a “Payment
Blockage Notice”) to the Company, from any holder or holders of such Designated Senior Debt or
their representative or representatives or the trustee or trustees under any indenture or under
which any instrument evidencing any such Designated Senior Debt may have been issued, that such an
event of default has occurred and is continuing, unless such event of default has been cured or
waived or such Designated Senior Debt has been paid in full in cash or other payment satisfactory
to the holders of such Designated Senior Debt; provided, however, if the maturity of such
Designated Senior Debt is accelerated (or in the case of any lease, as a result of such event of
default, the landlord under the lease has given the Company notice of its intention to terminate
the lease or to require the Company to make an irrevocable offer to terminate the lease following
an event of default thereunder), no payment may be made on the Securities until such Designated
Senior Debt has been paid in full in cash or other payment satisfactory to the holders of such
Designated Senior Debt or such acceleration (or termination, in the case of a lease) has been cured
or waived.

For purposes of this Section 13.1(d), such Payment Blockage Notice shall be deemed to include
notice of all other events of default under such indenture or instrument which are continuing at
the time of the event of default specified in such Payment Blockage Notice. The provisions of this
Section 13.1(d) shall apply only to one such Payment Blockage Notice given in any period of 365
days with respect to any issue of Designated Senior Debt, and no such continuing event of default
that existed or was continuing on the date of delivery of any Payment Blockage Notice shall be, or
shall be made, the basis for a subsequent Payment Blockage Notice.

(e) In the event that, notwithstanding the foregoing provisions of Sections 13.1(a), 13.1(b),
13.1(c) and 13.1(d), any payment on account of principal, premium, if any, or interest (including
Additional Interest Amounts, if any) on the Securities shall be made by or on behalf of the Company
and received by the Trustee, by any Holder or by any Paying Agent (or, if the Company is acting as
its own Paying Agent, money for any such payment shall be segregated and held in trust):

(i) after the occurrence of an event specified in Section 13.1(a) or 13.1(b), then, unless all
Senior Debt is paid in full in cash, or provision shall be made therefor,

(ii) after the happening of an event of default of the type specified in Section 13.1(c)
above, then, unless the amount of such Senior Debt then due shall have been paid in full, or
provision made therefor or such event of default shall have been cured or waived, or

(iii) after the happening of an event of default of the type specified in Section 13.1(d)
above and delivery of a Payment Blockage Notice, then, unless such event of default shall have been
cured or waived or the 179-day period specified in Section 13.1(d) shall have expired,

such payment (subject, in each case, to the provisions of Section 13.7 hereof) shall be held
in trust for the benefit of, and shall be immediately paid over to, the holders of Designated
Senior Debt (unless an event described in Section 13.1(a), (b) or (c) has occurred, in which case
the payment shall be held in trust for the benefit of, and shall be immediately paid over to all
holders of Senior Debt) or their representative or representatives or the trustee or trustees under
any indenture under which any instruments evidencing any of the Designated Senior Debt or Senior
Debt, as the case may be, may have been issued, as their interests may appear.

SECTION 13.2. Subrogation. Subject to the payment in full of all Senior Debt to which
the Indebtedness evidenced by the Securities is in the circumstances subordinated as provided in
Section 13.1 hereof, the Holders of the Securities shall be subrogated to the rights of the holders
of such Senior Debt to receive payments or distributions of cash, property or securities of the
Company applicable to such Senior Debt until all amounts owing on the Securities shall be paid in
full, and, as between the Company, its creditors other than holders of such Senior Debt, and the
Holders of the Securities, no such payment or distribution made to the holders of Senior Debt by
virtue of this Article which otherwise would have been made to the holders of the Securities shall
be deemed to be a payment by the Company on account of such Senior Debt; provided, however, that
the provisions of this Article are and are intended solely for the purpose of defining the relative
rights of the Holders of the Securities, on the one hand, and the holders of Senior Debt, on the
other hand.

SECTION 13.3. Obligation of the Company Is Absolute and Unconditional. Nothing
contained in this Article or elsewhere in this Indenture or in the Securities is intended to or
shall impair, as between the Company, its creditors other than the holders of Senior Debt, and the
Holders of the Securities, the obligation of the Company, which is absolute and unconditional, to
pay to the Holders of the Securities the principal of and premium, if any, and interest (including
Additional Interest Amounts, if any) on the Securities as and when the same shall become due and
payable in accordance with their terms, or is intended to or shall affect the relative rights of
the Holders of the Securities and creditors of the Company other than the holders of Senior Debt,
nor shall anything contained herein or therein prevent the Trustee or the Holder of any Security
from exercising all remedies otherwise permitted by applicable law upon default under this
Indenture, subject to the rights, if any, under this Article of the holders of Senior Debt in
respect of cash, property or securities of the Company received upon the exercise of any such
remedy.

SECTION 13.4. Maturity of or Default on Senior Debt. Upon the maturity of any Senior
Debt by lapse of time, acceleration or otherwise, all principal of or premium, if any, or interest
on, rent or other payment obligations in respect of all such matured Senior Debt shall first be
paid in full, or such payment shall have been duly provided for, before any payment on account of
principal, or premium, if any, or interest (including Additional Interest Amounts, if any) is made
upon the Securities.

SECTION 13.5. Payments on Securities Permitted. Except as expressly provided in this
Article, nothing contained in this Article shall affect the obligation of the Company to make, or
prevent the Company from making, payments of the principal of, or premium, if any, or interest
(including Additional Interest Amounts, if any) on the Securities in accordance with the provisions
hereof and thereof, or shall prevent the Trustee or any Paying Agent from applying any moneys
deposited with it hereunder to the payment of the principal of, or premium, if any, or interest
(including Additional Interest Amounts, if any) on the Securities.

SECTION 13.6. Effectuation of Subordination by Trustee. Each Holder of Securities, by
such Holder’s acceptance thereof, authorizes and directs the Trustee on such Holder’s behalf to
take such action as may be necessary or appropriate to effectuate the subordination provided in
this Article and appoints the Trustee such Holder’s attorney-in-fact for any and all such purposes.

Upon any payment or distribution of assets of the Company referred to in this Article, the
Trustee and the Holders of the Securities shall be entitled to rely upon any order or decree made
by any court of competent jurisdiction in which any such dissolution, winding up, liquidation or
reorganization proceeding affecting the affairs of the Company is pending or upon a certificate of
the trustee in bankruptcy, receiver, assignee for the benefit of creditors, liquidating trustee or
agent or other Person making any payment or distribution, delivered to the Trustee or to the
Holders of the Securities, for the purpose of ascertaining the Persons entitled to participate in
such payment or distribution, and as to other facts pertinent to the right of such Persons under
this Article, and if such evidence is not furnished, the Trustee may defer any payment to such
Persons pending judicial determination as to the right of such Persons to receive such payment.

SECTION 13.7. Knowledge of Trustee. Notwithstanding the provision of this Article or
any other provisions of this Indenture, the Trustee shall not be charged with knowledge of the
existence of any Senior Debt, of any default in payment of principal of, premium, if any, or
interest on, rent or other payment obligation in respect of any Senior Debt, or of any facts which
would prohibit the making of any payment of moneys to or by the Trustee, or the taking of any other
action by the Trustee, unless a Responsible Officer of the Trustee having responsibility for the
administration of the trust established by this Indenture shall have received written notice
thereof from the Company, any Holder of Securities, any Paying or Conversion Agent of the Company
or the holder or representative of any class of Senior Debt, and, prior to the receipt of any such
written notice, the Trustee shall be entitled in all respects to assume that no such default or
facts exist; provided, however, that unless on the third Business Day prior to the date upon which
by the terms hereof any such moneys may become payable for any purpose the Trustee shall have
received the notice provided for in this Section 13.7, then, anything herein contained to the
contrary notwithstanding, the Trustee shall have full power and authority to receive such moneys
and apply the same to the purpose for which they were received, and shall not be affected by any
notice to the contrary which may be received by it on or after such date.

SECTION 13.8. Trustee’s Relation to Senior Debt. The Trustee shall be entitled to all
the rights set forth in this Article with respect to any Senior Debt at the time held by it, to the
same extent as any other holder of Senior Debt and nothing in this Indenture shall deprive the
Trustee of any of its rights as such holder.

Nothing contained in this Article shall apply to claims of or payments to the Trustee under or
pursuant to Section 5.8 hereof.

With respect to the holders of Senior Debt, the Trustee undertakes to perform or to observe
only such of its covenants and obligations as are specifically set forth in this Article, and no
implied covenants or obligations with respect to the holders of Senior Debt shall be read into this
Indenture against the Trustee. The Trustee shall not be deemed to owe any fiduciary duty to the
holders of Senior Debt and the Trustee shall not be liable to any holder of Senior Debt if it shall
pay over or deliver to Holders, the Company or any other Person moneys or assets to which any
holder of Senior Debt shall be entitled by virtue of this Article or otherwise.

SECTION 13.9. Rights of Holders of Senior Debt Not Impaired. No right of any present
or future holder of any Senior Debt to enforce the subordination herein shall at any time or in any
way be prejudiced or impaired by any act or failure to act on the part of the Company or by any
noncompliance by the Company with the terms, provisions and covenants of this Indenture, regardless
of any knowledge thereof any such holder may have or be otherwise charged with.

SECTION 13.10. Modification of Terms of Senior Debt. Any renewal or extension of the
time of payment of any Senior Debt or the exercise by the holders of Senior Debt of any of their
rights under any instrument creating or evidencing Senior Debt, including without limitation the
waiver of default thereunder, may be made or done all without notice to or assent from the Holders
of the Securities or the Trustee.

No compromise, alteration, amendment, modification, extension, renewal or other change of, or
waiver, consent or other action in respect of, any liability or obligation under or in respect of,
or of any of the terms, covenants or conditions of any indenture or other instrument under which
any Senior Debt is outstanding or of such Senior Debt, whether or not such release is in accordance
with the provisions or any applicable document, shall in any way alter or affect any of the
provisions of this Article or of the Securities relating to the subordination thereof.

SECTION 13.11. Certain Conversions Not Deemed Payment. For the purposes of this
Article 13 only:

(1) the issuance and delivery of junior securities upon conversion of Securities in accordance
with Article 12 hereof shall not be deemed to constitute a payment or distribution on account of
the principal of, premium, if any, or interest (including Additional Interest Amounts, if any) on
Securities or on account of the purchase or other acquisition of Securities, and

(2) the payment, issuance or delivery of cash (except in satisfaction of fractional shares
pursuant to Section 12.3 hereof), property or securities (other than junior securities) upon
conversion of a Security shall be deemed to constitute payment on account of the principal of,
premium, if any, or interest (including Additional Interest Amounts, if any) such Security.

For the purposes of this Section 13.11, the term “junior securities” means:

(b) shares of any common stock of the Company or

(c) other securities of the Company that are subordinated in right of payment to all Senior
Debt that may be outstanding at the time of issuance or delivery of such securities to
substantially the same extent as, or to a greater extent than, the Securities are so subordinated
as provided in this Article.

Nothing contained in this Article 13 or elsewhere in this Indenture or in the Securities is
intended to or shall impair, as among the Company, its creditors (other than holders of Senior
Debt) and the Holders of Securities, the right, which is absolute and unconditional, of the Holder
of any Security to convert such Security in accordance with Article 12 hereof.

ARTICLE 14

OTHER PROVISIONS OF GENERAL APPLICATION

SECTION 14.1. Trust Indenture Act Controls. This Indenture is subject to the
provisions of the TIA which are required to be part of this Indenture, and shall, to the extent
applicable, be governed by such provisions.

SECTION 14.2. Notices. Any notice or communication to the Company or the Trustee is
duly given if in writing and delivered in person or mailed by first-class mail to the address set
forth below:

(a) if to the Company:

Cyberonics, Inc.

100 Cyberonics Boulevard

Houston, Texas 77058

Attention: David S. Wise, General Counsel

with a copy (which shall not constitute notice) to:

Vinson & Elkins LLP

First City Tower

1001 Fannin Street, Suite 2300

Houston, Texas 77002-6760

Attention: David Oelman, Esq.

(b) if to the Trustee:

Wells Fargo Bank, N.A.

505 Main Street, Suite 301

Fort Worth, TX 76102

Attention: [Corporate Trust Services /Cyberonics]

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

Any notice or communication to a Holder shall be mailed by first-class mail to his address
shown on the Register kept by the Registrar. Failure to mail a notice or communication to a Holder
or any defect in such notice or communication shall not affect its sufficiency with respect to
other Holders.

If a notice or communication is mailed or sent in the manner provided above within the time
prescribed, it is duly given as of the date it is mailed, whether or not the addressee receives it,
except that notice to the Trustee shall only be effective upon receipt thereof by the Trustee.

If the Company mails a notice or communication to Holders, it shall mail a copy to the Trustee
at the same time.

SECTION 14.3. Communication by Holders with Other Holders. Holders may communicate
pursuant to Section 312(b) of the TIA with other Holders with respect to their rights under the
Securities or this Indenture. The Company, the Trustee, the Registrar and anyone else shall have
the protection of Section 312(c) of the TIA.

SECTION 14.4. Acts of Holders of Securities.

(a) Any request, demand, authorization, direction, notice, consent, waiver or other action
provided by this Indenture to be given or taken by Holders of Securities may be embodied in and
evidenced by:

(1) one or more instruments of substantially similar tenor signed by such Holders in person or
by agent or proxy duly appointed in writing;

(2) the record of Holders of Securities voting in favor thereof, either in person or by
proxies duly appointed in writing, at any meeting of Holders of Securities duly called and held in
accordance with the provisions of Article 8; or

(3) a combination of such instruments and any such record.

Except as herein otherwise expressly provided, such action shall become effective when such
instrument or instruments or record or both are delivered to the Trustee and, where it is hereby
expressly required, to the Company. Such instrument or instruments and record (and the action
embodied therein and evidenced thereby) are herein sometimes referred to as the “Act” of the
Holders of Securities signing such instrument or instruments and so voting at such meeting. Proof
of execution of any such instrument or of a writing appointing any such agent or proxy, or of the
holding by any Person of a Security, shall be sufficient for any purpose of this Indenture and
(subject to Section 5.1 hereof) conclusive in favor of the Trustee and the Company if made in the
manner provided in this Section. The record of any meeting of Holders of Securities shall be
proved in the manner provided in Section 8.6 hereof.

(b) The fact and date of the execution by any Person of any such instrument or writing may be
provided in any manner which the Trustee reasonably deems sufficient.

(c) The principal amount and serial numbers of Securities held by any Person, and the date of
such Person holding the same, shall be proved by the Register.

(d) Any request, demand, authorization, direction, notice, consent, election, waiver or other
Act of the Holders of any Security shall bind every future Holder of the same Security and the
Holder of every Security issued upon the registration of transfer thereof or in exchange therefor
or in lieu thereof in respect of anything done, omitted or suffered to be done by the Trustee or
the Company in reliance thereon, whether or not notation of such action is made upon such Security.

SECTION 14.5. Certificate and Opinion as to Conditions Precedent. In any case where
several matters are required to be certified by, or covered by an opinion of, any specified Person,
it is not necessary that all such matters be certified by, or covered by the opinion of, only one
such Person, or that they be so certified or covered by only one document, but one such Person may
certify or give an opinion with respect to some matters and one or more other such Persons as to
other matters, and any such Person may certify or give an opinion as to such matters in one or
several documents.

Any certificate or opinion of an officer of the Company may be based, insofar as it relates to
legal matters, upon an Opinion of Counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the Opinion of Counsel with respect to the matters upon which
such certificate or opinion is based is erroneous. Any such Opinion of Counsel may be based,
insofar as it relates to factual matters, upon a certificate or representations by, an officer or
officers of the Company stating that the information with respect to such factual matters is in the
possession of the Company, unless such counsel knows, or in the exercise of reasonable care should
know, that the certificate or representations with respect to such matters are erroneous.

Where any Person is required to make, give or execute two or more applications, requests,
consents, certificates, statements, opinions or other instruments under this Indenture, they may,
but need not, be consolidated and form one instrument.

Upon any application or request by the Company to the Trustee to take any action under any
provision of this Indenture, the Company shall furnish to the Trustee an Officers’ Certificate
stating that all conditions precedent, if any, provided for in this Indenture relating to the
proposed action have been complied with and an Opinion of Counsel stating that in the opinion of
such Counsel all such conditions precedent, if any, have been complied with, except that in the
case of any such application or request as to which the furnishing of such documents is
specifically required by any provision of this Indenture relating to such particular application or
request, no additional certificate or opinion need be furnished.

SECTION 14.6. Statements Required in Certificate or Opinion. Each certificate or
opinion with respect to compliance with a condition or covenant provided for in this Indenture
shall include:

(1) a statement that each individual signing such certificate or opinion on behalf of the
Company has read such covenant or condition and the definitions herein relating thereto;

(2) a brief statement as to the nature and scope of the examination or investigation upon
which the statements or opinions contained in such certificate or opinion are based;

(3) a statement that, in the opinion of each such individual, he has made such examination or
investigation as is necessary to enable him to express an informed opinion as to whether or not
such covenant or condition has been complied with; and

(4) a statement as to whether, in the opinion of each such individual, such condition or
covenant has been complied with.

SECTION 14.7. Effect of Headings and Table of Contents. The Article and Section
headings herein and the Table of Contents are for convenience only and shall not affect the
construction hereof.

SECTION 14.8. Successors and Assigns. All covenants and agreements in this Indenture
by the Company shall bind its successors and assigns, whether so expressed or not.

SECTION 14.9. Separability Clause. In case any provision in this Indenture or the
Securities shall be invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

SECTION 14.10. Benefits of Indenture. Nothing contained in this Indenture or in the
Securities, express or implied, shall give to any Person, other than the parties hereto and their
successors hereunder, the holders of Senior Debt and the Holders of Securities, any benefit or
legal or equitable right, remedy or claim under this Indenture.

SECTION 14.11. Governing Law. THIS INDENTURE AND THE SECURITIES SHALL BE GOVERNED BY,
AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

SECTION 14.12. Counterparts. This instrument may be executed in any number of
counterparts, each of which when so executed shall be deemed to be an original but all such
counterparts shall together constitute but one and the same instrument.

SECTION 14.13. Legal Holidays. In any case where any Interest Payment Date or Stated
Maturity of any Security or the last day on which a Holder of a Security has a right to convert
such Security shall not be a Business Day at any Place of Payment or Place of Conversion, then
(notwithstanding any other provision of this Indenture or of the Securities) payment of interest or
principal or premium, if any, or conversion of the Securities, need not be made at such Place of
Payment or Place of Conversion on such day, but may be made on the next succeeding Business Day at
such Place of Payment or Place of Conversion with the same force and effect as if made on the
Interest Payment Date or at the Stated Maturity or on such last day for conversion; provided,
however, that in the case that payment is made on such succeeding Business Day, no interest shall
accrue on the amount so payable for the period from and after such Interest Payment Date or Stated
Maturity, as the case may be.

SECTION 14.14. Recourse Against Others. No recourse for the payment of the principal
of or premium, if any, or interest on any Security, or for any claim based thereon or otherwise in
respect thereof, shall be had against any incorporator, shareholder, officer or director, as such,
past, present or future, of the Company or of any successor corporation, whether by virtue of any
constitution, statute or rule of law or by the enforcement of any assessment or penalty or
otherwise, all such liability being, by the acceptance thereof and as part of the consideration for
the issue thereof, expressly waived and released.

4

[REMAINDER OF PAGE LEFT BLANK INTENTIONALLY]SIGNATURES

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

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	CYBERONICS,

	 	INC., as Issuer
	 	

	 	

	 	

	 	

	 	

	 	

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	By: /s/ David S. Wise

	 	

	 	

	 	

	 	

	 	

	 	

	 	

	Name: David S. Wise

	 	

	 	

	 	

	 	

	 	

	 	

	 	

	Title: Vice President,

Secretary

	 	General Counsel &

	 	

	 	

	 	

	 	

	 	

	 	

	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	WELLS FARGO BANK

	 	, N.A., as Trustee
	 	

	 	

	 	

	 	

	 	

	 	

	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	By: /s/ Melissa S. Scot

	 	t
	 	

	 	

	 	

	 	

	 	

	 	

	Name: Melissa S. Scott

	 	

	 	

	 	

	 	

	 	

	 	

	 	

	Title: Vice President

	 	

	 	

	 	

	 	

	 	

	 	

	 	

5

EXHIBIT A

FORM OF SECURITY

[FORM OF FACE OF SECURITY]

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY (“DTC”) TO CYBERONICS, INC. (OR ITS SUCCESSOR) OR ITS AGENT FOR REGISTRATION OF TRANSFER,
EXCHANGE, CONVERSION OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO.
OR OF SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT
HEREON 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 SINCE THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

THE NOTES AND THE SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF THIS NOTE HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE ‘‘SECURITIES ACT’’), OR ANY STATE
SECURITIES LAWS. NEITHER THIS NOTE, THE SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF THIS
NOTE NOR ANY INTEREST OR PARTICIPATION HEREIN OR THEREIN MAY BE REOFFERED, SOLD, ASSIGNED,
TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR
UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, REGISTRATION.

BY ITS ACQUISITION HEREOF, THE HOLDER (1) AGREES TO OFFER, SELL OR OTHERWISE TRANSFER SUCH
NOTE PRIOR TO THE DATE WHICH IS TWO YEARS AFTER THE LATER OF THE ORIGINAL ISSUE DATE HEREOF AND THE
LAST DATE ON WHICH THE COMPANY OR ANY AFFILIATE OF THE COMPANY WAS THE OWNER OF THIS NOTE (OR ANY
PREDECESSOR OF THIS NOTE) ONLY (A) TO THE COMPANY OR ANY SUBSIDIARY THEREOF, (B) PURSUANT TO A
REGISTRATION STATEMENT WHICH HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) FOR SO LONG
AS THE NOTES ARE ELIGIBLE FOR RESALE PURSUANT TO RULE 144A , TO A PERSON IT REASONABLY BELIEVES IS
A ‘‘QUALIFIED INSTITUTIONAL BUYER’’ AS DEFINED IN RULE 144A THAT PURCHASES FOR ITS OWN ACCOUNT OR
FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT THE TRANSFER IS
BEING MADE IN RELIANCE ON RULE 144A, (D) PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, SUBJECT TO THE COMPANY’S AND THE TRUSTEE’S RIGHT
PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER PURSUANT TO CLAUSE (D) TO REQUIRE THE DELIVERY OF AN
OPINION OF COUNSEL, CERTIFICATION AND/OR OTHER INFORMATION SATISFACTORY TO EACH OF THEM, AND IN
EACH OF THE FOREGOING CASES, TO REQUIRE THAT A CERTIFICATE OF TRANSFER IN THE FORM APPEARING ON THE
OTHER SIDE OF THIS NOTE IS COMPLETED AND DELIVERED BY THE TRANSFEROR TO THE TRUSTEE. THIS LEGEND
WILL BE REMOVED UPON THE REQUEST OF THE HOLDER AFTER THE RESALE RESTRICTION TERMINATION DATE.[1]

     

1 This legend should be included only if the Security is issued in global form.

6

CYBERONICS, INC.

3.0% Senior Subordinated Convertible Note due 2012

CUSIP NO. 23251PAA0

$

No.

1. CYBERONICS, INC., a Delaware corporation (the “Company”, which term includes any
successor corporation under the Indenture hereinafter referred to), for value received, hereby
promises to pay to, or its registered assigns, the principal sum of U.S. Dollars [ ] ($[ ]) on
September 27, 2012.

Interest Payment Dates: March 27 and September 27, commencing March 27, 2006.

Regular Record Dates: March 12 and September 12.

Reference is hereby made to the further provisions of this Security set forth on the reverse
hereof, which further provisions shall for all purposes have the same effect as if set forth at
this place.

[Signature Page to Follow]

7

IN WITNESS WHEREOF, the Company has caused this Security to be duly executed manually or by
facsimile by its duly authorized officers.

	 	 	 
	Dated: September 27, 2005	 	CYBERONICS, INC.
	By:

	 	

	 
	 	 
	
 
	 	Name:
	 
	 	 
	
 
	 	Title:
	 
	 	 
	By:

	 	

	 
	 	 
	
 
	 	Name:
	 
	 	 
	
 
	 	Title:

Trustee’s Certificate of Authentication

This is one of the 3.0% Senior Subordinated Convertible Notes due 2012 described in the
within-named Indenture.

WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee

	 
	 

	By:

	 

	Name:

	 

	Title:

Dated: September 27, 2005

8

[REVERSE OF SECURITY]

CYBERONICS, INC.

3.0% Senior Subordinated Convertible Note due 2012

Capitalized terms used herein but not defined shall have the meanings assigned to them in the
Indenture referred to below unless otherwise indicated.

1. Principal and Interest. Cyberonics, Inc., a Delaware corporation (the
“Company”), promises to pay interest on the principal amount of this Security at the
Interest Rate from the date of issuance until repayment at Maturity or repurchase. The Company
shall pay interest on this Security semiannually in arrears on March 27 and September 27 of each
year (each an “Interest Payment Date”), commencing March 27, 2006.

Interest on this Security shall be computed on the basis of a 360-day year of twelve 30-day
months and for any period shorter than a full semiannual period for which interest is calculated,
on the basis of a 30-day month and, for such periods of less than a month, the actual number of
days elapsed over a 30-day month.

A Holder of any Security at the close of business on a Regular Record Date shall be entitled
to receive interest on such Security on the corresponding Interest Payment Date. A Holder of any
Security which is converted after the close of business on a Regular Record Date and prior to the
corresponding Interest Payment Date (other than any Security whose Maturity is prior to such
Interest Payment Date) shall be entitled to receive interest on the principal amount of such
Security, notwithstanding the conversion of such Security prior to such Interest Payment Date.
However, any such Holder which surrenders any such Security for conversion during the period
between the close of business on such Regular Record Date and ending with the opening of business
on the corresponding Interest Payment Date shall be required to pay the Company an amount equal to
the interest on the principal amount of such Security so converted (but excluding any overdue
interest on the principal amount of such Security so converted that exists at the time such Holder
surrenders such Security for conversion), which is payable by the Company to such Holder on such
Interest Payment Date, at the time such Holder surrenders such Security for conversion.
Notwithstanding the foregoing, any such Holder which surrenders for conversion any Security with
respect to which the Company has specified a Repurchase Date that is after such Regular Record Date
and on or prior to the next succeeding Interest Payment Date, in either case, shall be entitled to
receive (and retain) such interest and need not pay the Company an amount equal to the interest on
the principal amount of such Security so converted at the time such Holder surrenders such Security
for conversion.

2. Method of Payment. Interest on any Security which is payable, and is punctually
paid or duly provided for, on any Interest Payment Date shall be paid to the person in whose name
that Security (or one or more Predecessor Securities) is registered at the close of business on the
Regular Record Date for such interest.

Principal of, and premium, if any, and interest on, Global Securities shall be payable to the
Depositary in immediately available funds.

Principal of and premium, if any, on Physical Securities shall be payable at the office or
agency of the Company maintained for such purpose, initially the Corporate Trust Office of the
Trustee. Interest on Physical Securities shall be payable by (i) U.S. Dollar check drawn on a bank
located in the city where the Corporate Trust Office of the Trustee is located mailed to the
address of the Person entitled thereto as such address shall appear in the Register, or (ii) upon
application to the Registrar not later than the relevant Record Date by a Holder of an aggregate
principal amount of Securities in excess of $5,000,000, wire transfer in immediately available
funds.

3. Paying Agent and Registrar. Initially, Wells Fargo Bank, National Association, the
Trustee under the Indenture, will act as Paying Agent and Registrar. The Company may change the
Paying Agent or Registrar without notice to any Holder.

4. Indenture. The Company issued this Security under an Indenture, dated as of
September 27, 2005 (the “Indenture”), between the Company and Wells Fargo Bank, National
Association, as trustee (the “Trustee”). The terms of this Security include those stated
in the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of
1939, as amended (“TIA”). This Security 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, in the event of any inconsistency between the terms of this Security and the terms of the
Indenture, the terms of the Indenture shall control.

5. Repurchase Rights.

(a) Repurchase Right Upon a Fundamental Change. If a Fundamental Change occurs, the
Holder of Securities, at the Holder’s option, shall have the right, in accordance with the
provisions of the Indenture, to require the Company to repurchase the Securities (or any portion of
the principal amount hereof that is at least $1,000 or an integral multiple thereof; provided,
however, that the portion of the principal amount of this Security to be Outstanding after such
repurchase is at least equal to $1,000) at a purchase price equal to 100% of the principal amount
of the Securities to be repurchased (the “Repurchase Price”), plus interest accrued and unpaid to,
but excluding, the Repurchase Date.

A Company Notice shall be given by the Company to the Holders as provided in the Indenture.
To exercise a Repurchase Right, a Holder must deliver to the Trustee a written notice as provided
in the Indenture.

(b) Payment of Repurchase Price. Subject to the fulfillment by the Company of the
conditions set forth in the Indenture, the Company may elect to pay the Repurchase Price by
delivering the number of shares of Common Stock equal to (i) the Repurchase Price divided by (ii)
95% of the average of the daily volume-weighted average price of the Common Stock for the twenty
consecutive Trading Days immediately preceding and including the third Business Day prior to the
Repurchase Date (if the third Business Day prior to the applicable Repurchase Date is a Trading
Day, or if not, then on the last Trading Day prior to the third Business Day), appropriately
adjusted to take into account the occurrence, during the period commencing on the first Trading Day
during the twenty Trading-Day period and ending on the Repurchase Date of any event that would
result in an adjustment to the conversion rate set forth in the Indenture. No fractional shares of
Common Stock will be issued upon repurchase of any Securities. Instead of any fractional share of
Common Stock which would otherwise be issued upon conversion of such Securities, the Company shall
pay a cash adjustment as provided in the Indenture.

6. Conversion Rights(c) . (a) Subject to and upon compliance with the provisions of
the Indenture, the Holder of Securities shall be entitled, at such Holder’s option, at any time
before the close of business on September 27, 2012, to convert the Holder’s Securities (or any
portion of the principal amount hereof which is $1,000 or an integral multiple thereof), at the
principal amount thereof or of such portion thereof, into duly authorized, fully paid and
nonassessable shares of Common Stock of the Company at the Conversion Rate in effect at the time of
conversion.

(d) In the case of a Fundamental Change for which the Holder exercises its Repurchase Right
with respect to a Security (or a portion thereof), such conversion right in respect of the Security
(or portion thereof) shall expire at the close of business on the Business Day preceding the
Repurchase Date.

Subject to certain conditions provided for in the Indenture, in certain circumstances, a
Holder may receive an amount in cash or Common Stock, at the option of the Company, equal to the
Make-Whole Premium, in addition to the shares of Common Stock issuable on conversion of such
Security.

(e) The Conversion Rate shall be initially equal to 24.0964 shares of Common Stock per $1,000
principal amount of Securities. The Conversion Rate shall be adjusted under certain circumstances
as provided in the Indenture.

(f) No fractional shares of Common Stock shall be issued upon conversion of any Securities.
Instead of any fractional share of Common Stock which would otherwise be issued upon conversion of
such Securities, the Company shall pay a cash adjustment as provided in the Indenture.

(g) If a Fundamental Change Effective Date occurs prior to September 27, 2012, other than in
connection with a Fundamental Change described in clause (3) of the definition of “Change of
Control,” and a Holder converts Securities in connection with such Fundamental Change, that Holder
shall receive the Make-Whole Premium payable pursuant to Section 12.13 of the Indenture consisting
of an increase in the Conversion Rate.

7. Subordination. The Indebtedness evidenced by this Security is, to the extent and
in the manner provided in the Indenture, subordinated and subject in right of payment to the prior
payment in full of all amounts then due on all Senior Debt of the Company; provided, however, that
the Securities, the Indebtedness represented thereby and the payment of the principal of and
premium, if any, and interest on the Securities in all respects shall rank equally with, or prior
to, all existing and future Indebtedness of the Company that is expressly subordinated to any
Senior Debt, and this Security is issued subject to such provisions of the Indenture with respect
thereto. Each Holder of this Security, by accepting the same, (a) agrees to and shall be bound by
such provisions, (b) authorizes and directs the Trustee on such Holder’s behalf to take such action
as may be necessary or appropriate to effectuate the subordination so provided and (c) appoints the
Trustee such Holder’s attorney-in-fact for any and all such purposes.

8. Denominations; Transfer; Exchange. The Securities are issuable in registered form,
without coupons, in denominations of $1,000 and integral multiples of $1,000 in excess thereof. A
Holder may register the transfer or exchange of Securities in accordance with the Indenture. The
Registrar may require a Holder, among other things, to furnish appropriate endorsements and
transfer documents and the Company may require a Holder to pay any taxes and fees required by law
or permitted by the Indenture.

In the event of a redemption in part, the Company shall not be required (a) to register the
transfer of, or exchange, Securities for a period of 15 days immediately preceding the date notice
is given identifying the serial numbers of the Securities called for such redemption, or (b) to
register the transfer of, or exchange, any such Securities, or portion thereof, called for
redemption.

In the event of redemption, conversion or repurchase of the Securities in part only, a new
Security or Securities for the unredeemed, unconverted or unrepurchased portion thereof shall be
issued in the name of the Holder hereof.

9. Persons Deemed Owners. The registered Holder of this Security shall be treated as
its owner for all purposes.

10. Unclaimed Money. The Trustee and the Paying Agent shall pay to the Company any
money held by them for the payment of principal, premium, if any, or interest that remains
unclaimed for two years after the date upon which such payment shall have become due. After
payment to the Company, Holders entitled to the money must look to the Company for payment as
general creditors unless an applicable abandoned property law designates another Person, and all
liability of the Trustee and the Paying Agent with respect to such money shall cease.

11. Discharge Prior to Redemption or Maturity. Subject to certain conditions
contained in the Indenture, the Company may discharge its obligations under the Securities and the
Indenture if (1) (a) all of the Outstanding Securities shall become due and payable at their
scheduled Maturity within one year or (b) all of the Outstanding Securities are scheduled for
redemption within one year, and (2) the Company shall have deposited with the Trustee money and/or
U.S. Government Obligations sufficient to pay the principal of, and premium, if any, and interest
on, all of the Outstanding Securities on the date of Maturity or redemption, as the case may be.

12. Amendment; Supplement; Waiver. The Indenture permits, with certain exceptions as
therein provided, the amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Holders of the Securities under the Indenture at any time by the
Company and the Trustee with the consent of the Holders of a majority in aggregate principal amount
of the Outstanding Securities (or such lesser amount as shall have acted at a meeting pursuant to
the provisions of the Indenture). The Indenture also contains provisions permitting the Holders of
specified percentages in principal amount of the Securities at the time Outstanding, on behalf of
the Holders of all the Securities, to waive compliance by the Company with certain provisions of
the Indenture and certain past defaults under the Indenture and their consequences. Any such
consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder
and upon all future Holders of this Security and of any Security issued upon registration of
transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent
or waiver is made upon this Security or such other Security.

No reference herein to the Indenture and no provision of this Security or of the Indenture
shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay
the principal of and premium, if any, and interest on this Security at the times, places and rate,
and in the coin or currency, herein prescribed or to convert this Security (or pay cash in lieu of
conversion) as provided in the Indenture.

13. Defaults and Remedies. The Indenture provides that an Event of Default with
respect to the Securities occurs when any of the following occurs:

(h) the Company defaults in the payment of the principal of or premium, if any, on any of the
Securities when it becomes due and payable, at Maturity, upon exercise of a Repurchase Right or
otherwise, whether or not such payment is prohibited by the subordination provisions of Article 13
of the Indenture; or

(i) the Company defaults in the payment of interest on any of the Securities when it becomes
due and payable and such default continues for a period of 30 days, whether or not such payment is
prohibited by the subordination provisions of Article 13 of the Indenture; or

(j) the Company fails to deliver shares of Common Stock, together with cash instead of
fractional shares, when those shares of Common Stock or cash instead of fractional shares is
required to be delivered following conversion of a Security in accordance with the provisions of
Article 12 of the Indenture; or

(k) the Company fails to perform or observe any other term, covenant or agreement contained in
the Securities or the Indenture and such default continues for a period of 60 days after written
notice of such failure is given as specified in the Indenture; or

(l) (i) the Company fails to make any payment by the end of the applicable grace period, if
any, after the maturity of any Indebtedness for borrowed money in an amount in excess of
$25,000,000, or (ii) there is an acceleration of any Indebtedness for borrowed money in an amount
in excess of $25,000,000 because of a default with respect to such Indebtedness without such
Indebtedness having been discharged or such acceleration having been cured, waived, rescinded or
annulled, in the case of either clause (i) or (ii) above, for a period of 30 days after written
notice is given to the Company as specified in the Indenture; or

(m) the failure to provide the Company Notice in accordance with the terms of Section 11.3(a)
of the Indenture; or

(n) there are certain events of bankruptcy, insolvency or reorganization of the Company.

If an Event of Default shall occur and be continuing, the principal of all the Securities may
be declared due and payable in the manner and with the effect provided in the Indenture.

14. Authentication. This Security shall not be valid until the Trustee (or
authenticating agent) executes the certificate of authentication on the other side of this
Security.

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

16. Additional Rights of Holders of Transfer Restricted Securities. In addition to
the rights provided to Holders under the Indenture, Holders of Transfer Restricted Securities shall
have all the rights set forth in the Registration Rights Agreement.

17. CUSIP Numbers. Pursuant to a recommendation promulgated by the Committee on
Uniform Security Identification Procedures, the Company has caused CUSIP numbers to be printed on
this Security and the Trustee may use CUSIP numbers in notices of redemption as a convenience to
Holders. No representation is made as to the accuracy of such numbers either as printed on this
Security or as contained in any notice of redemption and reliance may be placed only on the other
identification numbers placed thereon.

18. Governing Law. The Indenture and this Security shall be governed by, and
construed in accordance with, the law of the State of New York.

19. Successor Corporation. In the event a successor corporation assumes all the
obligations of the Company under this Security, pursuant to the terms hereof and of the Indenture,
the Company shall be released from all such obligations.

9

ASSIGNMENT FORM

To assign this Security, fill in the form below and have your signature guaranteed: (I) or (we)
assign and transfer this Security to:

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

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

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

	 	 	 
	Dated:

	 	

	 
	 	 
	
 
	 	Your Name:
	 
	 	 
	
 
	 	(Print your name exactly as it

appears on the face of this

Security)
	 
	 	 
	
 
	 	Your Signature:
	 
	 	 
	Signature

Guarantee*:

	 	(Sign exactly as your name

appears on the face of this

Security)
	 
	 	 
	By:

	 	

• Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor
acceptable to the Trustee).

10

CONVERSION NOTICE

	 	 	 	TO: CYBERONICS, INC.

100 Cyberonics Boulevard

Houston, Texas 77058

Attention: [ ]

The undersigned registered owner of this Security hereby irrevocably exercises the option to
convert this Security, or the portion hereof (which is $1,000 principal amount or an integral
multiple thereof) below designated, into shares of Common Stock in accordance with the terms of the
Indenture referred to in this Security, and directs that the shares issuable and deliverable upon
such conversion, together with any check in payment for fractional shares and any Securities
representing any unconverted principal amount hereof, be issued and delivered to the registered
holder hereof unless a different name has been indicated below. If shares or any portion of this
Security not converted is to be issued in the name of a person other than the undersigned, the
undersigned will pay all transfer taxes payable with respect thereto. Any amount required to be
paid to the undersigned on account of interest accompanies this Security.

	 	 	 	 	 
	Dated:

	 	Your Name:
	 	

	 
	 	 	 	 
	
 
	 	 	 	(Print your

name exactly

as it appears

on the face of

this Security)
	 
	 	 	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	
 
	 	Your

Signature:
	 	

	 
	 	 	 	 
	
 
	 	 	 	(Sign exactly

as your name

appears on the

face of this

Security)
	 
	 	 	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	
 
	 	Signature

Guarantee*:
	 	

	 
	 	 	 	 
	
 
	 	Social Security
	 	or other

Taxpayer
	 
	 	 	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	
 
	 	Identification

Number:
	 	

Principal amount to be converted (if less than all): $

*Participant in a recognized Signature Guarantee Medallion Program (or other signature
guarantor acceptable to the Trustee).

Fill in for registration of shares (if to be issued) and Securities (if to be delivered) other
than to and in the name of the registered holder:

(Name)

(Street Address)

(City, State and Zip Code)

11

NOTICE OF EXERCISE OF REPURCHASE RIGHT

	 	 	 	TO: CYBERONICS, INC.

100 Cyberonics Boulevard

Houston, Texas 77058

Attention: [ ]

The undersigned registered owner of this Security hereby irrevocably acknowledges receipt of a
notice from Cyberonics, Inc. (the “Company”) as to the occurrence of a Fundamental Change with
respect to the Company and requests and instructs the Company to repay the entire principal amount
of this Security, or the portion thereof (which is $1,000 principal amount or an integral multiple
thereof) below designated, in accordance with the terms of the Indenture referred to in this
Security, together with interest accrued and unpaid to, but excluding, such date, to the registered
holder hereof, in cash.

	 	 	 	 	 
	Dated:

	 	Your Name:
	 	

	 
	 	 	 	 
	
 
	 	 	 	(Print

your

name

exactly

as it

appears

on the

face of

this

Security)
	 
	 	 	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	
 
	 	Your

Signature:
	 	

	 
	 	 	 	 
	
 
	 	 	 	(Sign

exactly

as your

name

appears

on the

face of

this

Security)
	 
	 	 	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	
 
	 	Signature

Guarantee*:
	 	

	 
	 	 	 	 
	
 
	 	Social Security
	 	or other

Taxpayer
	 
	 	 	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	
 
	 	Identification

Number:
	 	

Principal amount to be repaid (if less than all): $

*Participant in a recognized Signature Guarantee Medallion Program (or other signature
guarantor acceptable to the Trustee).

12

SCHEDULE OF EXCHANGES FOR PHYSICAL SECURITIES2

The following exchanges of a part of this Global Security for Physical Securities have been made:

	 	 	 	 	 	 	 	 	 
	Date of Exchange

	 	Amount of decrease

in Principal Amount

of this Global

Security
	 	Amount of increase

in Principal Amount

of this Global

Security
	 	Principal Amount of

this Global

Security following

such decrease (or

increase)
	 	Signature of

authorized officer

of Trustee

2 This schedule should be included only if the Security is issued in global form.

13

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