EX-4.1





 Exhibit 4.1 

PYXIS ONCOLOGY, INC. 

INDENTURE 
 Dated as of ,
20  
 [ ] 

Trustee 












 TABLE OF CONTENTS 

 

							
	 	 	 	  	Page	 
	 ARTICLE I. DEFINITIONS AND INCORPORATION BY REFERENCE
	  	 	1	 
	 Section 1.1.
	 	Definitions	  	 	1	 
	 Section 1.2.
	 	Other Definitions	  	 	4	 
	 Section 1.3.
	 	Incorporation by Reference of Trust Indenture Act	  	 	4	 
	 Section 1.4.
	 	Rules of Construction	  	 	4	 
		
	 ARTICLE II. THE SECURITIES
	  	 	4	 
	 Section 2.1.
	 	Issuable in Series	  	 	4	 
	 Section 2.2.
	 	Establishment of Terms of Series of Securities	  	 	5	 
	 Section 2.3.
	 	Execution and Authentication	  	 	6	 
	 Section 2.4.
	 	Registrar and Paying Agent	  	 	7	 
	 Section 2.5.
	 	Paying Agent to Hold Money in Trust	  	 	7	 
	 Section 2.6.
	 	Securityholder Lists	  	 	7	 
	 Section 2.7.
	 	Mutilated, Destroyed, Lost and Stolen Securities	  	 	8	 
	 Section 2.8.
	 	Outstanding Securities	  	 	8	 
	 Section 2.9.
	 	Treasury Securities	  	 	8	 
	 Section 2.10.
	 	Temporary Securities	  	 	9	 
	 Section 2.11.
	 	Cancellation	  	 	9	 
	 Section 2.12.
	 	Defaulted Interest	  	 	9	 
	 Section 2.13.
	 	Global Securities	  	 	9	 
	 Section 2.14.
	 	CUSIP Numbers	  	 	10	 
		
	 ARTICLE III. REDEMPTION
	  	 	10	 
	 Section 3.1.
	 	Notice to Trustee	  	 	10	 
	 Section 3.2.
	 	Selection of Securities to be Redeemed	  	 	10	 
	 Section 3.3.
	 	Notice of Redemption	  	 	11	 
	 Section 3.4.
	 	Effect of Notice of Redemption	  	 	11	 
	 Section 3.5.
	 	Deposit of Redemption Price	  	 	12	 
	 Section 3.6.
	 	Securities Redeemed in Part	  	 	12	 














							
	 ARTICLE IV. COVENANTS
	  	 	12	 
	 Section 4.1.
	 	Payment of Principal and Interest	  	 	12	 
	 Section 4.2.
	 	SEC Reports	  	 	12	 
	 Section 4.3.
	 	Compliance Certificate	  	 	12	 
	 Section 4.4.
	 	Stay, Extension and Usury Laws	  	 	12	 
		
	 ARTICLE V. SUCCESSORS
	  	 	13	 
	 Section 5.1.
	 	When Company May Merge, Etc.	  	 	13	 
	 Section 5.2.
	 	Successor Corporation Substituted	  	 	13	 
		
	 ARTICLE VI. DEFAULTS AND REMEDIES
	  	 	13	 
	 Section 6.1.
	 	Events of Default	  	 	13	 
	 Section 6.2.
	 	Acceleration of Maturity; Rescission and Annulment	  	 	14	 
	 Section 6.3.
	 	Collection of Indebtedness and Suits for Enforcement by Trustee	  	 	14	 
	 Section 6.4.
	 	Trustee May File Proofs of Claim	  	 	15	 
	 Section 6.5.
	 	Trustee May Enforce Claims Without Possession of Securities	  	 	16	 
	 Section 6.6.
	 	Application of Money Collected	  	 	16	 
	 Section 6.7.
	 	Limitation on Suits	  	 	16	 
	 Section 6.8.
	 	Unconditional Right of Holders to Receive Principal and Interest	  	 	16	 
	 Section 6.9.
	 	Restoration of Rights and Remedies	  	 	17	 
	 Section 6.10.
	 	Rights and Remedies Cumulative	  	 	17	 
	 Section 6.11.
	 	Delay or Omission Not Waiver	  	 	17	 
	 Section 6.12.
	 	Control by Holders	  	 	17	 
	 Section 6.13.
	 	Waiver of Past Defaults	  	 	17	 
	 Section 6.14.
	 	Undertaking for Costs	  	 	18	 
	 Section 6.15.
	 	Subordination	  	 	18	 
		
	 ARTICLE VII. TRUSTEE
	  	 	18	 
	 Section 7.1.
	 	Duties of Trustee	  	 	18	 
	 Section 7.2.
	 	Rights of Trustee	  	 	19	 
	 Section 7.3.
	 	Individual Rights of Trustee	  	 	20	 
	 Section 7.4.
	 	Trustee’s Disclaimer	  	 	20	 
	 Section 7.5.
	 	Notice of Defaults	  	 	20	 
	 Section 7.6.
	 	Reports by Trustee to Holders	  	 	20	 
	 Section 7.7.
	 	Compensation and Indemnity	  	 	20	 
	 Section 7.8.
	 	Replacement of Trustee	  	 	21	 
	 Section 7.9.
	 	Successor Trustee by Merger, Etc.	  	 	22	 
	 Section 7.10.
	 	Eligibility; Disqualification	  	 	22	 
	 Section 7.11.
	 	Preferential Collection of Claims Against Company	  	 	22	 
		
	 ARTICLE VIII. SATISFACTION AND DISCHARGE; DEFEASANCE
	  	 	22	 
	 Section 8.1.
	 	Satisfaction and Discharge of Indenture	  	 	22	 
	 Section 8.2.
	 	Application of Trust Funds; Indemnification	  	 	23	 
	 Section 8.3.
	 	Legal Defeasance of Securities of any Series	  	 	23	 
	 Section 8.4.
	 	Covenant Defeasance	  	 	24	 
	 Section 8.5.
	 	Repayment to Company	  	 	25	 
	 Section 8.6.
	 	Reinstatement	  	 	25	 














							
	 ARTICLE IX. AMENDMENTS AND WAIVERS
	  	 	25	 
	 Section 9.1.
	 	Without Consent of Holders	  	 	25	 
	 Section 9.2.
	 	With Consent of Holders	  	 	26	 
	 Section 9.3.
	 	Compliance with Trust Indenture Act	  	 	27	 
	 Section 9.4.
	 	Revocation and Effect of Consents	  	 	27	 
	 Section 9.5.
	 	Notation on or Exchange of Securities	  	 	27	 
	 Section 9.6.
	 	Trustee Protected	  	 	27	 
		
	 ARTICLE X. MISCELLANEOUS
	  	 	27	 
	 Section 10.1.
	 	Trust Indenture Act Controls	  	 	27	 
	 Section 10.2.
	 	Notices	  	 	28	 
	 Section 10.3.
	 	Communication by Holders with Other Holders	  	 	29	 
	 Section 10.4.
	 	Certificate and Opinion as to Conditions Precedent	  	 	29	 
	 Section 10.5.
	 	Statements Required in Certificate or Opinion	  	 	29	 
	 Section 10.6.
	 	Rules by Trustee and Agents	  	 	29	 
	 Section 10.7.
	 	Legal Holidays	  	 	29	 
	 Section 10.8.
	 	No Recourse Against Others	  	 	29	 
	 Section 10.9.
	 	Counterparts	  	 	29	 
	 Section 10.10.
	 	Governing Law; Waiver of Jury Trial; Consent to Jurisdiction	  	 	30	 
	 Section 10.11.
	 	No Adverse Interpretation of Other Agreements	  	 	30	 
	 Section 10.12.
	 	Successors	  	 	30	 
	 Section 10.13.
	 	Severability	  	 	30	 
	 Section 10.14.
	 	Table of Contents, Headings, Etc.	  	 	30	 
	 Section 10.15.
	 	Securities in a Foreign Currency	  	 	30	 
	 Section 10.16.
	 	Judgment Currency	  	 	31	 
	 Section 10.17.
	 	Force Majeure	  	 	31	 
	 Section 10.18.
	 	U.S.A. Patriot Act	  	 	31	 
		
	 ARTICLE XI. SINKING FUNDS
	  	 	32	 
	 Section 11.1.
	 	Applicability of Article	  	 	32	 
	 Section 11.2.
	 	Satisfaction of Sinking Fund Payments with Securities	  	 	32	 
	 Section 11.3.
	 	Redemption of Securities for Sinking Fund	  	 	32	 













 PYXIS ONCOLOGY, INC. 

Reconciliation and tie between Trust Indenture Act of 1939 and 

Indenture, dated as of , 20  
  

			
	 § 310(a)(1)
	  	7.10
	 (a)(2)
	  	7.10
	 (a)(3)
	  	Not
Applicable
	 (a)(4)
	  	Not
Applicable
	 (a)(5)
	  	7.10
	 (b)
	  	7.10
	 §311(a)
	  	7.11
	 (b)
	  	7.11
	 (c)
	  	Not
Applicable
	 §312(a)
	  	2.6
	 (b)
	  	10.3
	 (c)
	  	10.3
	 §313(a)
	  	7.6
	 (b)(1)
	  	7.6
	 (b)(2)
	  	7.6
	 (c)(1)
	  	7.6
	 (d)
	  	7.6
	 §314(a)
	  	4.2, 10.5
	 (b)
	  	Not
Applicable
	 (c)(1)
	  	10.4
	 (c)(2)
	  	10.4
	 (c)(3)
	  	Not
Applicable
	 (d)
	  	Not
Applicable
	 (e)
	  	10.5
	 (f)
	  	Not
Applicable
	 §315(a)
	  	7.1
	 (b)
	  	7.5
	 (c)
	  	7.1
	 (d)
	  	7.1
	 (e)
	  	6.14
	 §316(a)
	  	2.10
	 (a)(1)(A)
	  	6.12
	 (a)(1)(B)
	  	6.13
	 (b)
	  	6.8
	 §317(a)(1)
	  	6.3
	 (a)(2)
	  	6.4
	 (b)
	  	2.5
	 §318(a)
	  	10.1

 Note: This reconciliation and tie shall not, for any purpose, be deemed to be part of the Indenture. 












 Indenture dated as of      , 20      between Pyxis Oncology,
Inc., a Delaware corporation (“Company”), and [______] (“Trustee”). 
 Each party agrees as follows for the benefit of the
other party and for the equal and ratable benefit of the Holders of the Securities issued under this Indenture. 
 ARTICLE I. 

DEFINITIONS AND INCORPORATION BY REFERENCE 

Section 1.1. Definitions. 
 “Additional
Amounts” means any additional amounts which are required hereby or by any Security, under circumstances specified herein or therein, to be paid by the Company in respect of certain taxes imposed on Holders specified herein or therein and
which are owing to such Holders. 
 “Affiliate” of any specified person means any other person directly or indirectly controlling or
controlled by or under common control with such specified person. For the purposes of this definition, “control” (including, with correlative meanings, the terms “controlled by” and “under common control with”), as used
with respect to any person, shall mean the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of such person, whether through the ownership of voting securities or by agreement or
otherwise. 
 “Agent” means any Registrar, Paying Agent or Notice Agent. 

“Board of Directors” means the board of directors of the Company or any duly authorized committee thereof. 

“Board Resolution” means a copy of a resolution certified by the Secretary or an Assistant Secretary of the Company to have been adopted by
the Board of Directors or pursuant to authorization by the Board of Directors and to be in full force and effect on the date of the certificate and delivered to the Trustee. 

“Business Day” means any day except a Saturday, Sunday or a legal holiday in The City of New York, New York (or in connection with any
payment, the place of payment) on which banking institutions are authorized or required by law, regulation or executive order to close. 
 “Capital
Stock” means any and all shares, interests, participations, rights or other equivalents (however designated) of corporate stock. 

“Company” means the party named as such above until a successor replaces it and thereafter means the successor. 

“Company Order” means a written order signed in the name of the Company by an Officer. 

“Corporate Trust Office” means the office of the Trustee at which at any particular time its corporate trust business related to this
Indenture shall be principally administered. 
 “Default” means any event which is, or after notice or passage of time or both would be, an
Event of Default. 
 “Depositary” means, with respect to the Securities of any Series issuable or issued in whole or in part in the form of
one or more Global Securities, the person designated as Depositary for such Series by the Company, which Depositary shall be a clearing agency registered under the Exchange Act; and if at any time there is more than one such person,
“Depositary” as used with respect to the Securities of any Series shall mean the Depositary with respect to the Securities of such Series. 

  
 1 













 “Discount Security” means any Security that provides for an amount less than the stated
principal amount thereof to be due and payable upon declaration of acceleration of the maturity thereof pursuant to Section 6.2. 

“Dollars” and “$” means the currency of The United States of America. 

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

“Foreign Currency” means any currency or currency unit issued by a government other than the government of The United States of America. 

“Foreign Government Obligations” means, with respect to Securities of any Series that are denominated in a Foreign Currency, direct
obligations of, or obligations guaranteed by, the government that issued or caused to be issued such currency for the payment of which obligations its full faith and credit is pledged and which are not callable or redeemable at the option of the
issuer thereof. 
 “GAAP” means accounting principles generally accepted in the United States of America set forth in the opinions and
pronouncements of the Accounting Principles Board of the American Institute of Certified Public Accountants and statements and pronouncements of the Financial Accounting Standards Board or in such other statements by such other entity as have been
approved by a significant segment of the accounting profession, which are in effect as of the date of determination. 
 “Global Security”
or “Global Securities” means a Security or Securities, as the case may be, in the form established pursuant to Section 2.2 evidencing all or part of a Series of Securities, issued to the Depositary for such Series or its
nominee, and registered in the name of such Depositary or nominee. 
 “Holder” or “Securityholder” means a person in whose
name a Security is registered. 
 “Indenture” means this Indenture as amended or supplemented from time to time and shall include the form
and terms of particular Series of Securities established as contemplated hereunder. 
 “interest” with respect to any Discount Security
which by its terms bears interest only after Maturity, means interest payable after Maturity. 
 “Maturity,” when used with respect to any
Security, 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 declaration of acceleration, call for redemption or otherwise. 

“Officer” means the Chief Executive Officer, President, the Chief Financial Officer, the Treasurer or any Assistant Treasurer, the Secretary
or any Assistant Secretary, and any Vice President of the Company. 
 “Officer’s Certificate” means a certificate signed by any
Officer. 
 “Opinion of Counsel” means a written opinion of legal counsel who is acceptable to the Trustee. The counsel may be an employee
of or counsel to the Company. The opinion may contain customary limitations, conditions and exceptions. 
 “person” means any individual,
corporation, partnership, joint venture, association, limited liability company, joint-stock company, trust, unincorporated organization or government or any agency or political subdivision thereof. 

“principal” of a Security means the principal of the Security plus, when appropriate, the premium, if any, on, and any Additional Amounts in
respect of, the Security. 
 “Responsible Officer” means any officer of the Trustee in its Corporate Trust Office having responsibility for
administration of this Indenture and also means, with respect to a particular corporate trust matter, any other officer to whom any corporate trust matter is referred because of his or her knowledge of and familiarity with a particular subject. 


  
 2 













 “SEC” means the Securities and Exchange Commission. 

“Securities” means the debentures, notes or other debt instruments of the Company of any Series authenticated and delivered under this
Indenture. 
 “Senior Indebtedness” means the principal of (and premium, if any) and unpaid interest on (i) the Company indebtedness
(including indebtedness of others guaranteed by the Company), whenever created, incurred, assumed or guaranteed, for money borrowed (other than indenture Securities issued under this Indenture and denominated as subordinated debt securities), unless
in the instrument creating or evidencing the same or under which the same is outstanding it is provided that this indebtedness is not senior or prior in right of payment to the subordinated Securities; and (ii) renewals, extensions,
modifications and refinancings of any such indebtedness. 
 “Series” or “Series of Securities” means each series of
debentures, notes or other debt instruments of the Company created pursuant to Sections 2.1 and 2.2 hereof. 
 “Stated Maturity” when used
with respect to any Security, means the date specified in such Security as the fixed date on which the principal of such Security or interest is due and payable. 

“Subsidiary” of any specified person means any corporation, association or other business entity of which more than 50% of the total voting
power of shares of Capital Stock entitled (without regard to the occurrence of any contingency) to vote in the election of directors, managers or trustees thereof is at the time owned or controlled, directly or indirectly, by such person or one or
more of the other Subsidiaries of that person or a combination thereof. 
 “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 Trust Indenture Act of 1939 is amended after such date, “TIA” means, to the extent required by any such
amendment, the Trust Indenture Act as so amended. 
 “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 or include each person who is then a Trustee hereunder, and if at any time there
is more than one such person, “Trustee” as used with respect to the Securities of any Series shall mean the Trustee with respect to Securities of that Series. 

“U.S. Government Obligations” means securities which are direct obligations of, or guaranteed by, The United States of America or an agency
of the United States of America for the payment of which its full faith and credit is pledged and which are not callable or redeemable at the option of the issuer thereof, and shall also include a depositary receipt issued by a bank or trust company
as custodian with respect to any such U.S. Government Obligation or a specific payment of interest on or principal of any such U.S. Government Obligation held by such custodian for the account of the holder of a depository receipt, provided
that (except as required by law) such custodian is not authorized to make any deduction from the amount payable to the holder of such depositary receipt from any amount received by the custodian in respect of the U.S. Government Obligation evidenced
by such depositary receipt. 

  
 3 













 Section 1.2. Other Definitions. 

 

					
	TERM	  	DEFINED
IN
SECTION	 
	 “Bankruptcy Law”
	  	 	6.1	 
	 “Custodian”
	  	 	6.1	 
	 “Event of Default”
	  	 	6.1	 
	 “Judgment Currency”
	  	 	10.16	 
	 “Legal Holiday”
	  	 	10.7	 
	 “mandatory sinking fund payment”
	  	 	11.1	 
	 “New York Banking Day”
	  	 	10.16	 
	 “Notice Agent”
	  	 	2.4	 
	 “optional sinking fund payment”
	  	 	11.1	 
	 “Paying Agent”
	  	 	2.4	 
	 “Registrar”
	  	 	2.4	 
	 “Required Currency”
	  	 	10.16	 
	 “Specified Courts”
	  	 	10.10	 
	 “successor person”
	  	 	5.1	 

 Section 1.3. Incorporation by Reference of Trust Indenture Act. 

Whenever this Indenture refers to a provision of the TIA, the provision is incorporated by reference in and made a part of this Indenture. The following TIA
terms used in this Indenture have the following meanings: 
 “Commission” means the SEC. 

“indenture securities” means the Securities. 

“indenture security holder” means a Securityholder. 

“indenture to be qualified” means this Indenture. 

“indenture trustee” or “institutional trustee” means the Trustee. 

“obligor” on the indenture securities means the Company and any successor obligor upon the Securities. 

All other terms used in this Indenture that are defined by the TIA, defined by TIA reference to another statute or defined by SEC rule under the TIA and not
otherwise defined herein are used herein as so defined. 
 Section 1.4. Rules of Construction. 

Unless the context otherwise requires: 
  

	 	(a)	 a term has the meaning assigned to it; 



 

	 	(b)	 an accounting term not otherwise defined has the meaning assigned to it in accordance with GAAP;



  

	 	(c)	 “or” is not exclusive; 



 

	 	(d)	 words in the singular include the plural, and in the plural include the singular; and 



 

	 	(e)	 provisions apply to successive events and transactions. 



ARTICLE II. 
 THE SECURITIES 

Section 2.1. Issuable in Series. 
 The aggregate
principal amount of Securities that may be authenticated and delivered under this Indenture is unlimited. The Securities may be issued in one or more Series. All Securities of a Series shall be identical except as may be set forth or determined in
the manner provided in a Board Resolution, a supplemental indenture or an Officer’s Certificate detailing the adoption of the terms thereof pursuant to authority granted under a Board 

Resolution. In the case of Securities of a Series to be issued from time to time, the Board Resolution, Officer’s Certificate or supplemental indenture
detailing the adoption of the terms thereof pursuant to authority granted under a Board Resolution may provide for the method by which specified terms (such as interest rate, maturity date, record date or date from which interest shall accrue) are
to be determined. Securities may differ between Series in respect of any matters, provided that all Series of Securities shall be equally and ratably entitled to the benefits of the Indenture. 

  
 4 













 Section 2.2. Establishment of Terms of Series of Securities. 

At or prior to the issuance of any Securities within a Series, the following shall be established (as to the Series generally, in the case of Subsection 2.2.1
and either as to such Securities within the Series or as to the Series generally in the case of Subsections 2.2.2 through 2.2.24) by or pursuant to a Board Resolution, and set forth or determined in the manner provided in a Board Resolution,
supplemental indenture hereto or Officer’s Certificate: 
 2.2.1. the designation or title (which shall distinguish the Securities of that particular
Series from the Securities of any other Series) and ranking (including the terms of any subordination provisions) of the Series; 
 2.2.2. the total
principal amount of the Series, the denominations in which the offered Securities will be issued and whether the offering may be reopened for additional Securities of that Series and on what terms; 

2.2.3. the percentage of the principal amount at which the Securities of the Series will be issued; 

2.2.4. the date or dates on which principal will be payable; 

2.2.5. the rate or rates (which may be either fixed or variable) and/or, if applicable, the method of determining such rate or rates of interest, if any, the
date or dates from which any interest shall accrue, or the method of determining such date or dates, and the date or dates on which any interest will be payable; 

2.2.6. the terms for redemption, extension or early repayment, if any; 

2.2.7. the currencies in which the Series are issued and payable; 

2.2.8. the obligation, if any, of the Company to redeem or purchase the Securities of the Series pursuant to any sinking fund or analogous provisions or at
the option of a Holder thereof and the period or periods within which, the price or prices at which and the terms and conditions upon which Securities of the Series shall be redeemed or purchased, in whole or in part, pursuant to such obligation;

 2.2.9. whether the amount of payments of principal, interest or premium, if any, on a Series of the Securities will be determined with reference to an
index, formula or other method and how these amounts will be determined; 
 2.2.10. the place or places of payment, transfer, conversion and/or exchange of
the Securities; 
 2.2.11. any restrictive covenants; 

2.2.12. whether the Series of Securities are issuable in certified form 

2.2.13. any provisions for legal defeasance or covenant defeasance; 

2.2.14. whether and under what circumstances we will pay Additional Amounts in respect of any tax, assessment or governmental charge and, if so, whether we
will have the option to redeem the Securities rather than pay the Additional Amounts (and the terms of this option); 
 2.2.15. if other than denominations
of $1,000 and any integral multiple thereof, the denominations in which the Securities of the Series shall be issuable; 
 2.2.16. the provisions for
convertibility or exchangeability of the Securities of the Series into or for any other Securities; 
 2.2.17. whether the Securities are subject to
subordination and the terms of such subordination; 

  
 5 













 2.2.18. any addition to, deletion of or change in the Events of Default which applies to any Securities of
the Series and any change in the right of the Trustee or the requisite Holders of such Securities to declare the principal amount thereof due and payable pursuant to Section 6.2; 

2.2.19. any addition to, deletion of or change in the covenants set forth in Articles IV or V which applies to Securities of the Series; 

2.2.20. any listing of Securities of such Series on any securities exchange; 

2.2.21. the provisions, if any, relating to conversion or exchange of any Securities of such Series, including if applicable, the conversion or exchange
price, the conversion or exchange period, provisions as to whether conversion or exchange will be mandatory, at the option of the Holders thereof or at the option of the Company, the events requiring an adjustment of the conversion price or exchange
price and provisions affecting conversion or exchange if such Series of Securities are redeemed; 
 2.2.22. any Depositaries, interest rate calculation
agents, exchange rate calculation agents or other agents with respect to Securities of such Series if other than those appointed herein; 
 2.2.23. any
other terms of the Series (which may supplement, modify or delete any provision of this Indenture insofar as it applies to such Series), including any terms that may be required under applicable law or regulations or advisable in connection with the
marketing of Securities of that Series; and 
 2.2.24. whether any of the Company’s direct or indirect Subsidiaries will guarantee the Securities of
that Series, including the terms of subordination, if any, of such guarantees. 
 All Securities of any one Series need not be issued at the same time and
may be issued from time to time, consistent with the terms of this Indenture, if so provided by or pursuant to the Board Resolution, supplemental indenture hereto or Officer’s Certificate referred to above. 

Section 2.3. Execution and Authentication. 
 An
Officer shall sign the Securities for 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 nevertheless be valid. 
 A Security shall not be valid until authenticated by the
manual signature of the Trustee or an authenticating agent. The signature shall be conclusive evidence that the Security has been authenticated under this Indenture. 

The Trustee shall at any time, and from time to time, authenticate Securities for original issue in the principal amount provided in the Board Resolution,
supplemental indenture hereto or Officer’s Certificate, upon receipt by the Trustee of a Company Order. Each Security shall be dated the date of its authentication. 

Prior to the issuance of Securities of any Series, the Trustee shall have received and (subject to Section 7.2) shall be fully protected in relying on:
(a) the Board Resolution, supplemental indenture hereto or Officer’s Certificate establishing the form of the Securities of that Series or of Securities within that Series and the terms of the Securities of that Series or of Securities
within that Series, (b) an Officer’s Certificate complying with Section 10.4, and (c) an Opinion of Counsel complying with Section 10.4. 

The Trustee shall have the right to decline to authenticate and deliver any Securities of such Series: (a) if the Trustee, being advised by counsel,
determines that such action may not be taken lawfully; or (b) if the Trustee in good faith by its board of directors or trustees, executive committee or a trust committee of directors and/or vice-presidents or a committee of Responsible
Officers shall determine that such action would expose the Trustee to personal liability to Holders of any then outstanding Series of Securities. 

  
 6 













 The Trustee may appoint an authenticating agent acceptable to the Company to authenticate Securities. An
authenticating agent may authenticate Securities whenever the Trustee may do so. Each reference in this Indenture to authentication by the Trustee includes authentication by such agent. An authenticating agent has the same rights as an Agent to deal
with the Company or an Affiliate of the Company. 
 Section 2.4. Registrar and Paying Agent. 

The Company shall maintain, with respect to each Series of Securities, at the place or places specified with respect to such Series pursuant to
Section 2.2, an office or agency where Securities of such Series may be presented or surrendered for payment (“Paying Agent”), where Securities of such Series may be surrendered for registration of transfer or exchange
(“Registrar”) and where notices and demands to or upon the Company in respect of the Securities of such Series and this Indenture may be delivered (“Notice Agent”). The Registrar shall keep a register with respect
to each Series of Securities and to their transfer and exchange. The Company will give prompt written notice to the Trustee of the name and address, and any change in the name or address, of each Registrar, Paying Agent or Notice Agent. If at any
time the Company shall fail to maintain any such required Registrar, Paying Agent or Notice Agent or shall fail to furnish the Trustee with the name and address thereof, such presentations, surrenders, notices and demands may be made or served at
the Corporate Trust Office of the Trustee, and the Company hereby appoints the Trustee as its agent to receive all such presentations, surrenders, notices and demands; provided, however, that any appointment of the Trustee as the
Notice Agent shall exclude the appointment of the Trustee or any office of the Trustee as an agent to receive the service of legal process on the Company. 

The Company may also from time to time designate one or more co-registrars, additional paying agents or additional
notice agents and may from time to time rescind such designations; provided, however, that no such designation or rescission shall in any manner relieve the Company of its obligations to maintain a Registrar, Paying Agent and Notice
Agent in each place so specified pursuant to Section 2.2 for Securities of any Series for such purposes. The Company will give prompt written notice to the Trustee of any such designation or rescission and of any change in the name or address
of any such co-registrar, additional paying agent or additional notice agent. The term “Registrar” includes any co-registrar; the term “Paying
Agent” includes any additional paying agent; and the term “Notice Agent” includes any additional notice agent. The Company or any of its Affiliates may serve as Registrar or Paying Agent. 

The Company hereby appoints the Trustee the initial Registrar, Paying Agent and Notice Agent for each Series unless another Registrar, Paying Agent or Notice
Agent, as the case may be, is appointed prior to the time Securities of that Series are first issued. 
 Section 2.5. Paying Agent to Hold Money in
Trust. 
 The Company shall require each Paying Agent other than the Trustee to agree in writing that the Paying Agent will hold in trust, for the
benefit of Securityholders of any Series of Securities, or the Trustee, all money held by the Paying Agent for the payment of principal of or interest on the Series of Securities, and will notify the Trustee in writing of any default by the Company
in making any such payment. While any such default continues, the Trustee may require a Paying Agent to pay all money held by it to the Trustee. The Company at any time may require a Paying Agent to pay all money held by it to the Trustee. Upon
payment over to the Trustee, the Paying Agent (if other than the Company or a Subsidiary of the Company) shall have no further liability for the money. If the Company or a Subsidiary of the Company acts as Paying Agent, it shall segregate and hold
in a separate trust fund for the benefit of Securityholders of any Series of Securities all money held by it as Paying Agent. Upon any bankruptcy, reorganization or similar proceeding with respect to the Company, the Trustee shall serve as Paying
Agent for the Securities. 
 Section 2.6. Securityholder Lists. 

The Trustee shall preserve in as current a form as is reasonably practicable the most recent list available to it of the names and addresses of
Securityholders of each Series of Securities and shall otherwise comply with TIA § 312(a). If the Trustee is not the Registrar, the Company shall furnish to the Trustee at least ten days before each interest payment date and at such other times
as the Trustee may request in writing a list, in such form and as of such date as the Trustee may reasonably require, of the names and addresses of Securityholders of each Series of Securities. 

  
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 Section 2.7. Mutilated, Destroyed, Lost and 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 the same Series and of like tenor and principal amount and bearing a number not contemporaneously outstanding. 
 If there shall be delivered to
the Company and the Trustee (i) evidence to their satisfaction of the destruction, loss or theft of any Security and (ii) such security or indemnity bond as may be required by each of them to hold itself and any of its agents 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 receipt of a Company Order the Trustee shall authenticate and make available for delivery,
in lieu of any such destroyed, lost or stolen Security, a new Security of the same Series and 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 may, instead of
issuing a new Security, pay such Security. 
 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 of any Series 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 shall be entitled to all the benefits of this Indenture equally and proportionately with any and all other
Securities of that Series 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 2.8. Outstanding
Securities. 
 The Securities outstanding at any time are all the Securities authenticated by the Trustee except for those canceled by it, those
delivered to it for cancellation, those reductions in the interest on a Global Security effected by the Trustee in accordance with the provisions hereof and those described in this Section as not outstanding. 

If a Security is replaced pursuant to Section 2.7, it ceases to be outstanding until the Trustee receives proof satisfactory to it that the replaced
Security is held by a bona fide purchaser. 
 If the Paying Agent (other than the Company, a Subsidiary of the Company or an Affiliate of the Company) holds
on the Maturity of Securities of a Series money sufficient to pay such Securities payable on that date, then on and after that date such Securities of the Series cease to be outstanding and interest on them ceases to accrue. 

The Company may purchase or otherwise acquire the Securities, whether by open market purchases, negotiated transactions or otherwise. A Security does not
cease to be outstanding because the Company or an Affiliate of the Company holds the Security (but see Section 2.9 below). 
 In determining whether
the Holders of the requisite principal amount of outstanding Securities have given any request, demand, authorization, direction, notice, consent or waiver hereunder, the principal amount of a Discount Security that shall be deemed to be outstanding
for such purposes shall be the amount of the principal thereof that would be due and payable as of the date of such determination upon a declaration of acceleration of the Maturity thereof pursuant to Section 6.2. 

Section 2.9. Treasury Securities. 
 In determining
whether the Holders of the required principal amount of Securities of a Series have concurred in any request, demand, authorization, direction, notice, consent or waiver, Securities of a Series owned by the Company or any Affiliate of the Company
shall be disregarded, except that for the purposes of determining whether the Trustee shall be protected in relying on any such request, demand, authorization, direction, notice, consent or waiver only Securities of a Series that a Responsible
Officer of the Trustee knows are so owned shall be so disregarded. 

  
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 Section 2.10. Temporary Securities. 

Until definitive Securities are ready for delivery, the Company may prepare and the Trustee shall authenticate temporary Securities upon a Company Order.
Temporary Securities shall be substantially in the form of definitive Securities but may have variations that the Company considers appropriate for temporary Securities. Without unreasonable delay, the Company shall prepare and the Trustee upon
receipt of a Company Order shall authenticate definitive Securities of the same Series and date of maturity in exchange for temporary Securities. Until so exchanged, temporary securities shall have the same rights under this Indenture as the
definitive Securities. 
 Section 2.11. Cancellation. 

The Company at any time may deliver Securities to the Trustee for cancellation. The Registrar and the Paying Agent shall forward to the Trustee any Securities
surrendered to them for registration of transfer, exchange or payment. The Trustee shall cancel all Securities surrendered for transfer, exchange, payment, replacement or cancellation and shall destroy such canceled Securities (subject to the record
retention requirement of the Exchange Act and the Trustee) and deliver a certificate of such cancellation to the Company upon written request of the Company. The Company may not issue new Securities to replace Securities that it has paid or
delivered to the Trustee for cancellation. 
 Section 2.12. Defaulted Interest. 

If the Company defaults in a payment of interest on a Series of Securities, it shall pay the defaulted interest, plus, to the extent permitted by law, any
interest payable on the defaulted interest, to the persons who are Securityholders of the Series on a subsequent special record date. The Company shall fix the record date and payment date. At least 10 days before the special record date, the
Company shall send to the Trustee and to each Securityholder of the Series a notice that states the special record date, the payment date and the amount of interest to be paid. The Company may pay defaulted interest in any other lawful manner. 

Section 2.13. Global Securities. 
 2.13.1. Terms
of Securities. A Board Resolution, a supplemental indenture hereto or an Officer’s Certificate shall establish whether the Securities of a Series shall be issued in whole or in part in the form of one or more Global Securities and the
Depositary for such Global Security or Securities. 
 A Global Security may not be transferred except as a whole by the Depositary with respect to such
Global Security to a nominee of such Depositary, by a nominee of such Depositary to such Depositary or another nominee of such Depositary or by the Depositary or any such nominee to a successor Depositary or a nominee of such a successor Depositary.

 2.13.2. Legends. Any Global Security issued hereunder shall bear a legend in substantially the following form: 

“THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITARY OR A
NOMINEE OF THE DEPOSITARY. THIS SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A
WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY, BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH A SUCCESSOR
DEPOSITARY.” 

  
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 In addition, so long as the Depository Trust Company (“DTC”) is the Depositary, each Global Note
registered in the name of DTC or its nominee shall bear a legend in substantially the following form: 
 “UNLESS THIS GLOBAL NOTE IS PRESENTED BY AN
AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY GLOBAL NOTE ISSUED IS REGISTERED IN THE NAME OF
CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR
OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.” 

2.13.3. Acts of Holders. The Depositary, as a Holder, may appoint agents and otherwise authorize participants to give or take any request, demand,
authorization, direction, notice, consent, waiver or other action which a Holder is entitled to give or take under the Indenture. 
 2.13.4.
Payments. Notwithstanding the other provisions of this Indenture, unless otherwise specified as contemplated by Section 2.2, payment of the principal of and interest, if any, on any Global Security shall be made to the Holder thereof.

 2.13.5 Consents, Declaration and Directions. The Company, the Trustee and any Agent shall treat a person as the Holder of such principal amount of
outstanding Securities of such Series represented by a Global Security as shall be specified in a written statement of the Depositary or by the applicable procedures of such Depositary with respect to such Global Security, for purposes of obtaining
any consents, declarations, waivers or directions required to be given by the Holders pursuant to this Indenture. 
 Section 2.14. CUSIP
Numbers. 
 The Company in issuing the Securities may use “CUSIP” numbers (if then generally in use), and, if so, the Trustee shall use
“CUSIP” numbers in notices of redemption as a convenience to Holders; provided that any such notice may state that no representation is made as to the correctness of such numbers either as printed on the Securities or as contained
in any notice of a redemption and that reliance may be placed only on the other elements of identification printed on the Securities, and any such redemption shall not be affected by any defect in or omission of such numbers. 

ARTICLE III. 
 REDEMPTION 

Section 3.1. Notice to Trustee. 
 The Company may,
with respect to any Series of Securities, reserve the right to redeem and pay the Series of Securities or may covenant to redeem and pay the Series of Securities or any part thereof prior to the Stated Maturity thereof at such time and on such terms
as provided for in such Securities. If a Series of Securities is redeemable and the Company wants or is obligated to redeem prior to the Stated Maturity thereof all or part of the Series of Securities pursuant to the terms of such Securities, it
shall notify the Trustee in writing of the redemption date and the principal amount of Series of Securities to be redeemed. The Company shall give the notice at least 15 days before the redemption date, unless a shorter period is satisfactory to the
Trustee. 
 Section 3.2. Selection of Securities to be Redeemed. 

Unless otherwise indicated for a particular Series by a Board Resolution, a supplemental indenture hereto or an Officer’s Certificate, if less than all
the Securities of a Series are to be redeemed, the Securities of the Series to be redeemed will be selected as follows: (a) if the Securities are in the form of Global Securities, in accordance with the procedures of the Depositary, (b) if
the Securities are listed on any national securities exchange, in compliance with 

  
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the requirements of the principal national securities exchange, if any, on which the Securities are listed, or (c) if not otherwise provided for under clause (a) or (b) in the manner
that the Trustee deems fair and appropriate, including by lot or other method, unless otherwise required by law or applicable stock exchange requirements, subject, in the case of Global Securities, to the applicable rules and procedures of the
Depositary. The Securities to be redeemed shall be selected from Securities of the Series outstanding not previously called for redemption. Portions of the principal of Securities of the Series that have denominations larger than $1,000 may be
selected for redemption. Securities of the Series and portions of them it selected for redemption shall be in amounts of $1,000 or whole multiples of $1,000 or, with respect to Securities of any Series issuable in other denominations pursuant to
Section 2.2.15, the minimum principal denomination for each Series and the authorized integral multiples thereof. Provisions of this Indenture that apply to Securities of a Series called for redemption also apply to portions of Securities of
that Series called for redemption. 
 Section 3.3. Notice of Redemption. 

Unless otherwise indicated for a particular Series by Board Resolution, a supplemental indenture hereto or an Officer’s Certificate, at least 15 days but
not more than 60 days before a redemption date, the Company shall send or cause to be sent by first-class mail or electronically, in accordance with the procedures of the Depositary, a notice of redemption to each Holder whose Securities are to be
redeemed. 
 The notice shall identify the Securities of the Series to be redeemed and shall state: 

(a) the redemption date; 
 (b) the redemption price; 

(c) the name and address of the Paying Agent; 
 (d) if any
Securities are being redeemed in part, the portion of the principal amount of such Securities to be redeemed and that, after the redemption date and upon surrender of such Security, a new Security or Securities in principal amount equal to the
unredeemed portion of the original Security shall be issued in the name of the Holder thereof upon cancellation of the original Security; 
 (e) that
Securities of the Series called for redemption must be surrendered to the Paying Agent to collect the redemption price; 
 (f) that interest on Securities
of the Series called for redemption ceases to accrue on and after the redemption date unless the Company defaults in the deposit of the redemption price; 

(g) the CUSIP number, if any; and 
 (h) any other information as
may be required by the terms of the particular Series or the Securities of a Series being redeemed. 
 At the Company’s request, the Trustee shall give
the notice of redemption in the Company’s name and at its expense, provided, however, that the Company has delivered to the Trustee, at least 10 days (unless a shorter time shall be acceptable to the Trustee) prior to the notice date, an
Officer’s Certificate requesting that the Trustee give such notice and setting forth the information to be stated in such notice. 
 Section 3.4.
Effect of Notice of Redemption. 
 Once notice of redemption is sent as provided in Section 3.3, Securities of a Series called for redemption
become due and payable on the redemption date and at the redemption price. Except as otherwise provided in the supplemental indenture, Board Resolution or Officer’s Certificate for a Series, a notice of redemption may not be conditional. Upon
surrender to the Paying Agent, such Securities shall be paid at the redemption price plus accrued interest to the redemption date. 

  
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 Section 3.5. Deposit of Redemption Price. 

On or before 11:00 a.m., New York City time, on the redemption date, the Company shall deposit with the Paying Agent money sufficient to pay the redemption
price of and accrued interest, if any, on all Securities to be redeemed on that date. 
 Section 3.6. Securities Redeemed in Part. 

Upon surrender of a Security that is redeemed in part, the Trustee shall authenticate for the Holder a new Security of the same Series and the same maturity
equal in principal amount to the unredeemed portion of the Security surrendered. 
 ARTICLE IV. 

COVENANTS 
 Section 4.1. Payment of
Principal and Interest. 
 The Company covenants and agrees for the benefit of the Holders of each Series of Securities that it will duly and punctually
pay the principal of and interest, if any, on the Securities of that Series in accordance with the terms of such Securities and this Indenture. On or before 11:00 a.m., New York City time, on the applicable payment date, the Company shall deposit
with the Paying Agent money sufficient to pay the principal of and interest, if any, on the Securities of each Series in accordance with the terms of such Securities and this Indenture. 

Section 4.2. SEC Reports. 
 To the extent any
Securities of a Series are outstanding, 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. The Company also shall comply with the other provisions of TIA §
314(a). Reports, information and documents filed with the SEC via the EDGAR system will be deemed to be delivered to the Trustee as of the time of such filing via EDGAR for purposes of this Section 4.2. 

Delivery of reports, information and documents to the Trustee under this Section 4.2 are for informational purposes only and the Trustee’s receipt
of the foregoing shall not constitute constructive or actual notice of any information contained therein or determinable from information contained therein, including the Company’s compliance with any of their covenants hereunder (as to which
the Trustee is entitled to rely exclusively on Officer’s Certificates). 
 Section 4.3. Compliance Certificate. 

To the extent any Securities of a Series are outstanding, each year, the Company shall furnish to the Trustee an Officer’s Certificate stating that to
their knowledge the Company is in compliance with this Indenture and the Securities, or else specifying any Default. 
 Section 4.4. Stay, Extension
and Usury Laws. 
 The Company covenants (to the extent that it may lawfully do so) that it will not at any time insist upon, plead, or in any manner
whatsoever claim or take the benefit or advantage of, any stay, extension or usury law wherever enacted, now or at any time hereafter in force, which may affect the covenants or the performance of this Indenture or the Securities; and the Company
(to the extent it may lawfully do so) hereby expressly waives all benefit or advantage of any such law and covenants that it will not, by resort to any such law, hinder, delay or impede the execution of any power herein granted to the Trustee, but
will suffer and permit the execution of every such power as though no such law has been enacted. 

  
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 ARTICLE V. 

SUCCESSORS 
 Section 5.1. When Company May
Merge, Etc. 
 The Company shall not consolidate with or merge with or into, or convey, transfer or lease all or substantially all of its properties and
assets to, any person (a “successor person”) unless all of the following conditions are met: 
 (a) if the Company does not survive such
transaction or the Company conveys, transfers or leases its properties and assets substantially as an entirety, the acquiring company must be a corporation, limited liability company, partnership or trust, or other corporate form, organized under
the laws of any state of the United States or the District of Columbia, and such company must agree to be legally responsible for our Securities, and, if not already subject to the jurisdiction of any state of the United States or the District of
Columbia, the new company must submit to such jurisdiction for all purposes with respect to the Securities and appoint an Agent for service of process; 

(b) alternatively, the Company must be the surviving Company; 

(c) immediately after giving effect to the transaction, no Default or Event of Default, shall have occurred and be continuing. 

The Company shall deliver to the Trustee prior to the consummation of the proposed transaction an Officer’s Certificate to the foregoing effect and an
Opinion of Counsel stating that the proposed transaction and any supplemental indenture comply with this Indenture. 
 Notwithstanding the above, any
Subsidiary of the Company may consolidate with, merge into or transfer all or part of its properties to the Company. Neither an Officer’s Certificate nor an Opinion of Counsel shall be required to be delivered in connection therewith. 

Section 5.2. Successor Corporation Substituted. 

Upon any consolidation or merger, or any sale, lease, conveyance or other disposition of all or substantially all of the assets of the Company in accordance
with Section 5.1, the successor corporation formed by such consolidation or into or with which the Company is merged or to which such sale, lease, conveyance or other disposition 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 has been named as the Company herein; provided, however, that the predecessor Company in the case of a sale,
conveyance or other disposition (other than a lease) shall be released from all obligations and covenants under this Indenture and the Securities. 

ARTICLE VI. 
 DEFAULTS AND REMEDIES

 Section 6.1. Events of Default. 

“Event of Default,” wherever used herein with respect to Securities of any Series, means any one of the following events, unless in the
establishing Board Resolution, supplemental indenture or Officer’s Certificate, it is provided that such Series shall not have the benefit of said Event of Default: 

(a) default in the payment of any interest on any Security of that Series when it becomes due and payable, and continuance of such default for a period of 30
days (unless the entire amount of such payment is deposited by the Company with the Trustee or with a Paying Agent prior to 11:00 a.m., New York City time, on the 30th day of such period); or 

(b) default in the payment of principal of, or any premium on, any Security of that Series at its Maturity; or 

  
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 (c) the Company remains in breach of a covenant in respect of Securities of the Series for 90 days after
there has been given, by registered or certified mail, to the Company by the Trustee or to the Company and the Trustee by the Holders of at least 25% in principal amount of the outstanding Securities of that Series a written notice specifying such
default or breach and requiring it to be remedied and stating that such notice is a “Notice of Default” hereunder; or 
 (d) the Company pursuant
to or within the meaning of any Bankruptcy Law: 
 (i) commences a voluntary case, 

(ii) consents to the entry of an order for relief against it in an involuntary case, 

(iii) consents to the appointment of a Custodian of it or for all or substantially all of its property, 

(iv) makes a general assignment for the benefit of its creditors, or 

(v) generally is unable to pay its debts as the same become due; or 

(e) a court of competent jurisdiction enters an order or decree under any Bankruptcy Law that: 

(i) is for relief against the Company in an involuntary case, 

(ii) appoints a Custodian of the Company or for all or substantially all of its property, or 

(iii) orders the liquidation of the Company, 
 and the order or
decree remains unstayed and in effect for 60 days; or 
 (e) any other Event of Default provided with respect to Securities of that Series, which is
specified in a Board Resolution, a supplemental indenture hereto or an Officer’s Certificate, in accordance with Section 2.2.18. 
 The term
“Bankruptcy Law” means title 11, U.S. Code or any similar Federal or State law for the relief of debtors. The term “Custodian” means any receiver, trustee, assignee, liquidator or similar official under any
Bankruptcy Law. 
 Section 6.2. Acceleration of Maturity; Rescission and Annulment. 

If an Event of Default has occurred and has not been cured or waived (other than an Event of Default referred to in Section 6.1(d) or (e)) then in every
such case the Trustee or the Holders of not less than 25% in principal amount (or, if any Securities of that Series are Discount Securities, such portion of the principal amount as may be specified in the terms of such Securities) of and accrued and
unpaid interest, if any, on all of the Securities of that Series to be due and payable immediately, by a notice in writing to the Company (and to the Trustee if given by Holders), and upon any such declaration such principal amount (or specified
amount) and accrued and unpaid interest, if any, shall become immediately due and payable. If an Event of Default specified in Section 6.1(d) or (e) shall occur, the principal amount (or specified amount) of and accrued and unpaid
interest, if any, on all outstanding Securities shall ipso facto become and be immediately due and payable without any declaration or other act on the part of the Trustee or any Holder. 

At any time after such a declaration of acceleration with respect to any Series has been made and before a judgment or decree for payment of the money due has
been obtained by the Trustee as hereinafter in this Article provided, the Holders of a majority in principal amount of the outstanding Securities of that Series, by written notice to the Company and the Trustee, may rescind and annul such
declaration and its consequences if all Events of Default with respect to Securities of that Series, other than the non-payment of the principal and interest, if any, of Securities of that Series which have
become due solely by such declaration of acceleration, have been cured or waived as provided in Section 6.13. 
 No such rescission shall affect any
subsequent Default or impair any right consequent thereon. 
 Section 6.3. Collection of Indebtedness and Suits for Enforcement by Trustee. 

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

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

(c) default is made in the deposit of any sinking fund payment, if any, when and as due by the terms of a Security, 

then, the Company will, upon demand of the Trustee, pay to it, for the benefit of the Holders of such Securities, the whole amount then due and payable
on such Securities for principal and interest and, to the extent that payment of such interest shall be legally enforceable, interest on any overdue principal and any overdue interest at the rate or rates prescribed therefor in such Securities, and,
in addition thereto, such further amount as shall be sufficient to cover the costs and expenses of collection, including the compensation, reasonable 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 or any other obligor upon such Securities and collect the moneys adjudged or deemed
to be payable in the manner provided by law out of the property of the Company or any other obligor upon such Securities, wherever situated. 
 If an Event
of Default with respect to any Securities of any Series 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 of such Series 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 6.4. 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 any other obligor upon the Securities or the property of the Company or of such other obligor or their 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, 
 (a) to file and prove a claim for the whole amount of principal 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 compensation, reasonable expenses, disbursements and advances of the Trustee, its agents and counsel) and
of the Holders allowed in such judicial proceeding, and 
 (b) to collect and receive any moneys or other property payable or deliverable on any such claims
and to distribute the same, 
 and any custodian, receiver, assignee, trustee, liquidator, sequestrator or other similar official in any such judicial
proceeding is hereby authorized by each Holder to make such payments to the Trustee and, in the event that the Trustee shall consent to the making of such payments directly to the Holders, to pay to the Trustee any amount due it for the
compensation, reasonable expenses, disbursements and advances of the Trustee, its agents and counsel, and any other amounts due the Trustee under Section 7.7. 

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

  
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 Section 6.5. Trustee May Enforce Claims Without Possession of Securities. 

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

Section 6.6. Application of Money Collected. 
 Any
money or 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 or property on account of principal 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 under Section 7.7; and 
 Second: To the payment of the amounts then due and unpaid for principal of and
interest on the Securities 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 interest,
respectively; and 
 Third: To the Company. 

Section 6.7. Limitation on Suits. 
 No Holder of any
Security of any Series shall have any right to institute any proceeding, judicial or otherwise, with respect to this Indenture, or for the appointment of a receiver or trustee, or for any other remedy hereunder, unless 

(a) such Holder has previously given written notice to the Trustee of a continuing Event of Default with respect to the Securities of that Series; 

(b) the Holders of not less than 25% in principal amount of the outstanding Securities of that Series shall have made written request to the Trustee to
institute proceedings in respect of such Event of Default in its own name as Trustee hereunder; 
 (c) such Holder or Holders have offered to the Trustee
indemnity or security satisfactory to the Trustee against the costs, expenses and liabilities which might be incurred by the Trustee in compliance with such request; 

(d) the Trustee for 60 days after its receipt of such notice, request and offer of indemnity has failed to institute any such proceeding; and 

(e) no direction inconsistent with such written request has been given to the Trustee during such 60-day period by the
Holders of a majority in principal amount of the outstanding Securities of that Series; 
 it being understood, intended and expressly covenanted by the
Holder of every Security with every other Holder and the Trustee that no one or more of such Holders shall have any right in any manner whatever by virtue of, or by availing of, any provision of this Indenture to affect, disturb or prejudice the
rights of any other of such Holders, or to obtain or to seek to obtain priority or preference over any other of such Holders or to enforce any right under this Indenture, except in the manner herein provided and for the equal and ratable benefit of
all such Holders of the applicable Series. 
 Section 6.8. Unconditional Right of Holders to Receive Principal and Interest. 

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 interest, if any, on such Security on the Maturity of such Security, including the Stated Maturity expressed in such Security (or, in the case of redemption, on the redemption date) and to institute suit for the
enforcement of any such payment, and such rights shall not be impaired without the consent of such Holder. 

  
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 Section 6.9. Restoration of Rights and Remedies. 

If the Trustee or any Holder 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 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 6.10. Rights and Remedies Cumulative. 

Except as otherwise provided with respect to the replacement or payment of mutilated, destroyed, lost or stolen Securities in Section 2.7, no right or
remedy herein conferred upon or reserved to the Trustee or to the Holders is intended to be exclusive of any other right or remedy, and every right and remedy shall, to the extent permitted by law, be cumulative and in addition to every other right
and remedy given hereunder or now or hereafter existing at law or in equity or otherwise. The assertion or employment of any right or remedy hereunder, or otherwise, shall not, to the extent permitted by law, prevent the concurrent assertion or
employment of any other appropriate right or remedy. 
 Section 6.11. Delay or Omission Not Waiver. 

No delay or omission of the Trustee or of any Holder of any Securities to exercise any right or remedy accruing upon any Event of Default shall impair any
such right or remedy or constitute a waiver of any such Event of Default or an acquiescence therein. Every right and remedy given by this Article or by law to the Trustee or to the Holders may be exercised from time to time, and as often as may be
deemed expedient, by the Trustee or by the Holders, as the case may be. 
 Section 6.12. Control by Holders. 

The Holders of a majority in principal amount of the outstanding Securities of any Series shall have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Trustee, or exercising any trust or power conferred on the Trustee, with respect to the Securities of such Series, provided that 

(a) such direction shall not be in conflict with any rule of law or with this Indenture, 

(b) the Trustee may take any other action deemed proper by the Trustee which is not inconsistent with such direction, 

(c) subject to the provisions of Section 7.1, the Trustee shall have the right to decline to follow any such direction if the Trustee in good faith
shall, by a Responsible Officer of the Trustee, determine that the proceeding so directed would involve the Trustee in personal liability, and 
 (d) prior
to taking any action as directed under this Section 6.12, the Trustee shall be entitled to indemnity satisfactory to it against the costs, expenses and liabilities which might be incurred by it in compliance with such request or direction. 

Section 6.13. Waiver of Past Defaults. 
 The Holders
of not less than a majority in principal amount of the outstanding Securities of any Series may on behalf of the Holders of all the Securities of such Series, by written notice to the Trustee and the Company, waive any past Default hereunder with
respect to such Series and its consequences, except a Default in the payment of the principal of or interest on any Security of such Series (provided, however, that the Holders of a majority in principal amount of the outstanding Securities of any
Series may rescind an acceleration and its consequences, including any related payment default that resulted from such acceleration). 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; but no such waiver shall extend to any subsequent or other Default or impair any right consequent thereon. 

  
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 Section 6.14. Undertaking for Costs. 

All parties to this Indenture agree, and each Holder of any Security by his 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 principal amount of the outstanding Securities of any Series, or to any suit instituted by any Holder for the enforcement of the payment of the principal of or interest on any Security on or after the Maturity of such
Security, including the Stated Maturity expressed in such Security (or, in the case of redemption, on the redemption date). 
 Section 6.15
Subordination 
 Upon any distribution of our assets upon the Company’s dissolution, winding up, liquidation or reorganization, the payment of
the principal of (and premium, if any) and interest on any Securities denominated as subordinated Securities is to be subordinated to the extent provided in this Indenture in right of payment to the prior payment in full of all Senior Indebtedness,
but the Company’s obligation to Holders to make payment of the principal of (and premium, if any) and interest on such subordinated Securities will not otherwise be affected. In addition, no payment on account of principal (or premium, if any),
interest or sinking fund, if any, may be made on such subordinated Securities at any time unless full payment of all amounts due in respect of the principal (and premium, if any), interest and sinking fund, if any, on Senior Indebtedness has been
made or duly provided for in money or money’s worth. 
 In the event that, notwithstanding the foregoing, any payment from the Company is received by
the Trustee in respect of subordinated Securities or by the Holders of any of such subordinated Securities before all Senior Indebtedness is paid in full, the payment or distribution must be paid over to the Holders of the Senior Indebtedness or on
their behalf for application to the payment of all the Senior Indebtedness remaining unpaid until all the Senior Indebtedness has been paid in full, after giving effect to any concurrent payment or distribution to the Holders of the Senior
Indebtedness. Subject to the payment in full of all Senior Indebtedness, the Holders of such subordinated Securities will be subrogated to the rights of the Holders of the Senior Indebtedness to the extent of payments made to the Holders of the
Senior Indebtedness out of the distributive share of such subordinated Securities. 
 By reason of this subordination, in the event of a distribution of our
assets upon the Company’s insolvency, certain of our senior creditors may recover more, ratably, than holders of any subordinated Securities. These subordination provisions will not apply to money and Securities held in trust under the
defeasance provisions of this Indenture. 
 ARTICLE VII. 

TRUSTEE 
 Section 7.1. Duties of
Trustee. 
 (a) If an Event of Default has occurred and is continuing, the Trustee shall exercise 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. 

(b) Except during the continuance of an Event of Default: 
 (i)
The Trustee need perform only those duties that are specifically set forth in this Indenture and no others. 
 (ii) 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 Officer’s Certificates or Opinions of Counsel furnished to the Trustee and conforming to the requirements of this
Indenture; however, in the case of any such Officer’s Certificates or Opinions of Counsel which by any provisions hereof are specifically required to be furnished to the Trustee, the Trustee shall examine such Officer’s Certificates
and Opinions of Counsel to determine whether or not they conform to the form requirements of this Indenture. 

  
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 (c) The Trustee may not be relieved from liability for its own negligent action, its own negligent failure
to act or its own willful misconduct, except that: 
 (i) This paragraph does not limit the effect of paragraph (b) of this Section. 

(ii) The Trustee shall not be liable for any error of judgment made in good faith by a Responsible Officer, unless it is proved that the Trustee was negligent
in ascertaining the pertinent facts. 
 (iii) The Trustee shall not be liable with respect to any action taken, suffered or omitted to be taken by it with
respect to Securities of any Series in good faith in accordance with the direction of the Holders of a majority in principal amount of the outstanding Securities of such Series relating to the time, method and place of conducting any proceeding for
any remedy available to the Trustee, or exercising any trust or power conferred upon the Trustee, under this Indenture with respect to the Securities of such Series in accordance with Section 6.12. 

(d) Every provision of this Indenture that in any way relates to the Trustee is subject to paragraph (a), (b) and (c) of this Section. 

(e) The Trustee may refuse to perform any duty or exercise any right or power unless it receives indemnity satisfactory to it against the costs, expenses and
liabilities which might be incurred by it in performing such duty or exercising such right or power. 
 (f) The Trustee shall not be liable for interest on
any money received by it except as the Trustee may agree in writing with the Company. Money held in trust by the Trustee need not be segregated from other funds except to the extent required by law. 

(g) No provision of this Indenture shall require the Trustee to risk its own funds or otherwise incur any financial liability in the performance of any of its
duties, or in the exercise of any of its rights or powers, if adequate indemnity against such risk is not assured to the Trustee in its satisfaction. 
 (h)
The Paying Agent, the Registrar and any authenticating agent shall be entitled to the protections and immunities as are set forth in paragraphs (e), (f) and (g) of this Section and in Section 7.2, each with respect to the Trustee. 

Section 7.2. Rights of Trustee. 
 (a) The Trustee
may rely on and shall be protected in acting or refraining from acting upon any document (whether in its original or facsimile form) believed by it to be genuine and to have been signed or presented by the proper person. The Trustee need not
investigate any fact or matter stated in the document. 
 (b) Before the Trustee acts or refrains from acting, it may require an Officer’s 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 such Officer’s Certificate or Opinion of Counsel. 

(c) The Trustee may act through agents and shall not be responsible for the misconduct or negligence of any agent appointed with due care. No Depositary shall
be deemed an agent of the Trustee and the Trustee shall not be responsible for any act or omission by any Depositary. 
 (d) The Trustee shall not be liable
for any action it takes or omits to take in good faith which it believes to be authorized or within its rights or powers, provided that the Trustee’s conduct does not constitute willful misconduct or negligence. 

(e) The Trustee may consult with counsel and the advice of such counsel or any Opinion of Counsel shall be full and complete authorization and protection in
respect of any action taken, suffered or omitted by it hereunder without willful misconduct or negligence, and in reliance thereon. 
 (f) The Trustee shall
be under no obligation to exercise any of the rights or powers vested in it by this Indenture at the request or direction of any of the Holders of Securities unless such Holders shall have offered to the Trustee security or indemnity satisfactory to
it against the costs, expenses and liabilities which might be incurred by it in compliance with such request or direction. 

  
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 (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, 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. 
 (h) The Trustee shall not be deemed to have notice 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 such a default is received by the Trustee at the Corporate Trust Office of the Trustee, and such notice
references the Securities generally or the Securities of a particular Series and this Indenture. 
 (i) In no event shall the Trustee be liable to any
person for special, punitive, indirect, consequential or incidental loss or damage of any kind whatsoever (including but not limited to lost profits), even if the Trustee has been advised of the likelihood of such loss or damage. 

(j) The permissive right of the Trustee to take the actions permitted by this Indenture shall not be construed as an obligation or duty to do so. 

Section 7.3. 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 an Affiliate of the Company with the same rights it would have if it were not Trustee. Any Agent may do the same
with like rights. The Trustee is also subject to Sections 7.10 and 7.11. 
 Section 7.4. Trustee’s Disclaimer. 

The Trustee makes no representation as to the validity or adequacy of this Indenture or the Securities, it shall not be accountable for the Company’s use
of the proceeds from the Securities, and it shall not be responsible for any statement in the Securities other than its authentication. 
 Section 7.5.
Notice of Defaults. 
 If a Default or Event of Default occurs and is continuing with respect to the Securities of any Series and if it is known to a
Responsible Officer of the Trustee, the Trustee shall send to each Securityholder of the Securities of that Series notice of a Default or Event of Default within 90 days after it occurs or, if later, after a Responsible Officer of the Trustee has
knowledge of such Default or Event of Default. Except in the case of a Default or Event of Default in payment of principal of or interest on any Security of any Series, the Trustee may withhold the notice if and so long as its corporate trust
committee or a committee of its Responsible Officers in good faith determines that withholding the notice is in the interests of Securityholders of that Series. 

Section 7.6. Reports by Trustee to Holders. 
 Within
60 days after each anniversary of the date of this Indenture, the Trustee shall transmit by mail to all Securityholders, as their names and addresses appear on the register kept by the Registrar, a brief report dated as of such anniversary date, in
accordance with, and to the extent required under, TIA § 313. 
 A copy of each report at the time of its mailing to Securityholders of any Series
shall be filed with the SEC and each national securities exchange on which the Securities of that Series are listed. The Company shall promptly notify the Trustee in writing when Securities of any Series are listed on any national securities
exchange. 
 Section 7.7. Compensation and Indemnity. 

The Company shall pay to the Trustee from time to time compensation for its services as the Company and the Trustee shall from time to time agree upon in
writing. The Trustee’s compensation shall not be limited by any law on compensation of a trustee of an express trust. The Company shall reimburse the Trustee upon request for all reasonable out of pocket expenses incurred by it. Such expenses
shall include the reasonable compensation and expenses of the Trustee’s agents and counsel. 

  
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 The Company shall indemnify each of the Trustee and any predecessor Trustee (including for the cost of
defending itself) against any cost, expense or liability, including taxes (other than taxes based upon, measured by or determined by the income of the Trustee) incurred by it except as set forth in the next paragraph in the performance of its duties
under this Indenture as Trustee or Agent. The Trustee shall notify the Company promptly of any claim for which it may seek indemnity. Failure by the Trustee to so notify the Company shall not relieve the Company of its obligations hereunder, unless
and to the extent that the Company is materially prejudiced thereby. The Company shall defend the claim and the Trustee shall cooperate in the defense. The Trustee may have one separate counsel and the Company shall pay the reasonable fees and
expenses of such counsel. The Company need not pay for any settlement made without its consent, which consent will not be unreasonably withheld. This indemnification shall apply to officers, directors, employees, shareholders and agents of the
Trustee. 
 The Company need not reimburse any expense or indemnify against any loss or liability incurred by the Trustee or by any officer, director,
employee, shareholder or agent of the Trustee through willful misconduct or negligence. 
 To secure the Company’s payment obligations in this Section,
the Trustee shall have a lien prior to the Securities of any Series on all money or property held or collected by the Trustee, except that held in trust to pay principal of and interest on particular Securities of that Series. 

When the Trustee incurs expenses or renders services after an Event of Default specified in Section 6.1(d) or (e) occurs, the expenses and the
compensation for the services are intended to constitute expenses of administration under any Bankruptcy Law. 
 The provisions of this Section shall
survive the termination of this Indenture. 
 Section 7.8. 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. 
 The Trustee may resign with respect to the Securities of one or more Series by so notifying the Company at least
30 days prior to the date of the proposed resignation. The Holders of a majority in principal amount of the Securities of any Series may remove the Trustee with respect to that Series by so notifying the Trustee and the Company. The Company may
remove the Trustee with respect to Securities of one or more Series if: 
 (a) the Trustee fails to comply with Section 7.10; 

(b) 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; 

(c) a Custodian or public officer takes charge of the Trustee or its property; or 

(d) the Trustee becomes incapable of acting. 
 If the Trustee
resigns or is removed or if a vacancy exists in the office of Trustee for any reason, the Company shall promptly appoint a successor Trustee. Within one year after the successor Trustee takes office, the Holders of a majority in principal amount of
the then outstanding Securities may appoint a successor Trustee to replace the successor Trustee appointed by the Company. 
 If a successor Trustee with
respect to the Securities of any one or more Series does not take office within 60 days after the retiring Trustee resigns or is removed, the retiring Trustee, the Company or the Holders of at least a majority in principal amount of the Securities
of the applicable Series may petition 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. Immediately after that, the retiring Trustee shall transfer all property held by it as Trustee to the successor Trustee subject to the lien provided for in
Section 7.7, 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 with respect to each Series of Securities for which it is acting as
Trustee under this Indenture. A successor Trustee shall mail a notice of its succession to each Securityholder of each such Series. Notwithstanding replacement of the Trustee pursuant to this Section 7.8, the Company’s obligations under
Section 7.7 hereof shall continue for the benefit of the retiring Trustee with respect to expenses and liabilities incurred by it for actions taken or omitted to be taken in accordance with its rights, powers and duties under this Indenture
prior to such replacement. 

  
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 Section 7.9. Successor Trustee by Merger, Etc. 

If the Trustee consolidates with, merges or converts into, or transfers all or substantially all of its corporate trust business to, another corporation, the
successor corporation without any further act shall be the successor Trustee, subject to Section 7.10. 
 Section 7.10. Eligibility;
Disqualification. 
 This Indenture shall always have a Trustee who satisfies the requirements of TIA § 310(a)(1), (2) and (5). The Trustee shall
always have a combined capital and surplus of at least $25,000,000 as set forth in its most recent published annual report of condition. The Trustee shall comply with TIA § 310(b). 

Section 7.11. Preferential Collection of Claims Against Company. 

The Trustee is subject to TIA § 311(a), excluding any creditor relationship listed in TIA § 311(b). A Trustee who has resigned or been removed shall
be subject to TIA § 311(a) to the extent indicated. 
 ARTICLE VIII. 

SATISFACTION AND DISCHARGE; DEFEASANCE 

Section 8.1. Satisfaction and Discharge of Indenture. 

This Indenture shall upon Company Order be discharged with respect to the Securities of any Series and cease to be of further effect as to all Securities of
such Series (except as hereinafter provided in this Section 8.1), and the Trustee, at the expense of the Company, shall execute instruments acknowledging satisfaction and discharge of this Indenture, when 

(a) either 
 (i) all Securities of such Series theretofore
authenticated and delivered (other than Securities that have been destroyed, lost or stolen and that have been replaced or paid) have been delivered to the Trustee for cancellation; or 

(ii) all such Securities of such Series not theretofore delivered to the Trustee for cancellation 

(1) have become due and payable by reason of sending a notice of redemption or otherwise, or 

(2) will become due and payable at their Stated Maturity within one year, or 

(3) have been called for redemption or are to be called for redemption within one year under arrangements satisfactory to the Trustee for the giving of notice
of redemption by the Trustee in the name, and at the expense, of the Company, or 
 (4) are deemed paid and discharged pursuant to Section 8.3, as
applicable; 
 and the Company, in the case of (1), (2) or (3) above, shall have irrevocably deposited or caused to be deposited with the Trustee as
trust funds in trust an amount of money or U.S. Government Obligations, which amount shall be sufficient for the purpose of paying and discharging each installment of principal (including mandatory sinking fund or analogous payments) of and interest
on all the Securities of such Series on the dates such installments of principal or interest are due; 
 (b) the Company has paid or caused to be paid all
other sums payable hereunder by the Company; and 
 (c) the Company shall have delivered to the Trustee an Officer’s Certificate and an Opinion of
Counsel, each stating that all conditions precedent provided for relating to the satisfaction and discharge contemplated by this Section have been complied with. 

  
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 Notwithstanding the satisfaction and discharge of this Indenture, the obligations of the Company to the
Trustee under Section 7.7, and, if money shall have been deposited with the Trustee pursuant to clause (a) of this Section, the provisions of Sections 2.4, 2.7, 8.2 and 8.5 shall survive. 

Section 8.2. Application of Trust Funds; Indemnification. 

(a) Subject to the provisions of Section 8.5, all money and U.S. Government Obligations or Foreign Government Obligations deposited with the Trustee
pursuant to Section 8.1, 8.3 or 8.4 and all money received by the Trustee in respect of U.S. Government Obligations or Foreign Government Obligations deposited with the Trustee pursuant to Section 8.1, 8.3 or 8.4, shall be held in trust
and applied by it, in accordance with the provisions of the Securities and this Indenture, to the payment, either directly or through any Paying Agent (including the Company acting as its own Paying Agent) as the Trustee may determine, to the
persons entitled thereto, of the principal and interest for whose payment such money has been deposited with or received by the Trustee or to make mandatory sinking fund payments or analogous payments as contemplated by Sections 8.1, 8.3 or 8.4.

 (b) The Company shall pay and shall indemnify the Trustee against any tax, fee or other charge imposed on or assessed against U.S. Government Obligations
or Foreign Government Obligations deposited pursuant to Sections 8.1, 8.3 or 8.4 or the interest and principal received in respect of such obligations other than any payable by or on behalf of Holders. 

(c) The Trustee shall deliver or pay to the Company from time to time upon Company Order any U.S. Government Obligations or Foreign Government Obligations or
money held by it as provided in Sections 8.3 or 8.4 which, in the opinion of a nationally recognized firm of independent certified public accountants or investment bank expressed in a written certification thereof delivered to the Trustee, are then
in excess of the amount thereof which then would have been required to be deposited for the purpose for which such U.S. Government Obligations or Foreign Government Obligations or money were deposited or received. This provision shall not authorize
the sale by the Trustee of any U.S. Government Obligations or Foreign Government Obligations held under this Indenture. 
 Section 8.3. Legal
Defeasance of Securities of any Series. 
 Unless this Section 8.3 is otherwise specified, pursuant to Section 2.2, to be inapplicable to
Securities of any Series, the Company shall be deemed to have paid and discharged the entire indebtedness on all the outstanding Securities of any Series on the 91st day after the date of the deposit referred to in subparagraph (d) hereof, and
the provisions of this Indenture, as it relates to such outstanding Securities of such Series, shall no longer be in effect (and the Trustee, at the expense of the Company, shall, upon receipt of a Company Order, execute instruments acknowledging
the same), except as to: 
 (a) the rights of Holders of Securities of such Series to receive, from the trust funds described in subparagraph
(d) hereof, (i) payment of the principal of and each installment of principal of and interest on the outstanding Securities of such Series on the Maturity of such principal or installment of principal or interest and (ii) the benefit of
any mandatory sinking fund payments applicable to the Securities of such Series on the day on which such payments are due and payable in accordance with the terms of this Indenture and the Securities of such Series; 

(b) the provisions of Sections 2.4, 2.5, 2.7, 7.7, 8.2, 8.3, 8.5 and 8.6; and 

(c) the rights, powers, trusts and immunities of the Trustee hereunder and the Company’s obligations in connection therewith; 

provided that, the following conditions shall have been satisfied: 

(d) the Company shall have irrevocably deposited or caused to be deposited (except as provided in Section 8.2(c)) with the Trustee as trust funds
specifically pledged as security for and dedicated solely to the benefit of the Holders of such Securities (i) in the case of Securities of such Series denominated in Dollars, cash in Dollars and/or U.S. Government Obligations, or (ii) in
the case of Securities of such Series denominated in a Foreign Currency (other than a composite currency), money and/or Foreign 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 such Trustee), not later than one day before the due date of any payment of 

  
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money, an amount in cash, sufficient, in the opinion of a nationally recognized firm of independent public accountants or investment bank expressed in a written certification thereof delivered to
the Trustee, to pay and discharge each installment of principal of and interest, on and any mandatory sinking fund payments in respect of all the Securities of such Series on the dates such installments of principal or interest and such sinking fund
payments are due; 
 (e) such deposit will not result in a breach or violation of, or constitute a default under, this Indenture or any other agreement or
instrument to which the Company is a party or by which it is bound; 
 (f) no Default or Event of Default with respect to the Securities of such Series
shall have occurred and be continuing on the date of such deposit or during the period ending on the 91st day after such date; 
 (g) the Company shall have
delivered to the Trustee an Officer’s Certificate and an Opinion of Counsel to the effect that (i) the Company has received from, or there has been published by, the Internal Revenue Service a ruling, or (ii) since the date of
execution of this Indenture, there has been a change in the applicable Federal income tax law, in either case to the effect that, and based thereon such Opinion of Counsel shall confirm that, the Holders of the Securities of such Series will not
recognize income, gain or loss for Federal income tax purposes as a result of such deposit, defeasance 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, defeasance and discharge had not occurred; 
 (h) the Company shall have delivered to the Trustee an Officer’s Certificate
stating that the deposit was not made by the Company with the intent of defeating, hindering, delaying or defrauding any other creditors of the Company; and 

(i) the Company shall have delivered to the Trustee an Officer’s Certificate and an Opinion of Counsel, each stating that all conditions precedent
provided for relating to the defeasance contemplated by this Section have been complied with. 
 Section 8.4. Covenant Defeasance. 

Unless this Section 8.4 is otherwise specified pursuant to Section 2.2 to be inapplicable to Securities of any Series, the Company may omit to
comply with respect to the Securities of any Series with any term, provision or condition set forth under Sections 4.2, 4.3, 4.4 and 5.1 and, unless otherwise specified therein, any additional covenants specified in a supplemental indenture for such
Series of Securities or a Board Resolution or an Officer’s Certificate delivered pursuant to Section 2.2 (and the failure to comply with any such covenants shall not constitute a Default or Event of Default with respect to such Series
under Section 6.1) and the occurrence of any event specified in a supplemental indenture for such Series of Securities or a Board Resolution or an Officer’s Certificate delivered pursuant to Section 2.2 and designated as an Event of
Default shall not constitute a Default or Event of Default hereunder, with respect to the Securities of such Series, but, except as specified above, the remainder of this Indenture and such Securities will be unaffected thereby; provided that the
following conditions shall have been satisfied: 
 (a) with reference to this Section 8.4, the Company has irrevocably deposited or caused to be
irrevocably deposited (except as provided in Section 8.2(c)) with the Trustee as trust funds in trust for the purpose of making the following payments specifically pledged as security for, and dedicated solely to, the benefit of the Holders of
such Securities (i) in the case of Securities of such Series denominated in Dollars, cash in Dollars and/or U.S. Government Obligations, or (ii) in the case of Securities of such Series denominated in a Foreign Currency (other than a
composite currency), money and/or Foreign 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 such 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 certified public accountants or investment bank expressed in a
written certification thereof delivered to the Trustee, to pay and discharge each installment of principal (including mandatory sinking fund or analogous payments) of and interest on all the Securities of such Series on the dates such installments
of principal or interest are due; 
 (b) such deposit will not result in a breach or violation of, or constitute a default under, this Indenture or any
other agreement or instrument to which the Company is a party or by which it is bound; 
 (c) no Default or Event of Default with respect to the Securities
of such Series shall have occurred and be continuing on the date of such deposit; 

  
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 (d) the Company shall have delivered to the Trustee an Officers’ Certificate and an Opinion of Counsel
to the effect that the Holders of the Securities of such Series will not recognize income, gain or loss for Federal income tax purposes as a result of such deposit and covenant defeasance 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 covenant defeasance had not occurred; 
 (e) The Company shall
have delivered to the Trustee an Officer’s Certificate stating the deposit was not made by the Company with the intent of defeating, hindering, delaying or defrauding any other creditors of the Company; and 

(f) The Company shall have delivered to the Trustee an Officer’s Certificate and an Opinion of Counsel, each stating that all conditions precedent herein
provided for relating to the covenant defeasance contemplated by this Section have been complied with. 
 Section 8.5. Repayment to Company.

 Subject to applicable abandoned property law, the Trustee and the Paying Agent shall pay to the Company upon request any money held by them for the
payment of principal and interest that remains unclaimed for two years. After that, Securityholders entitled to the money must look to the Company for payment as general creditors unless an applicable abandoned property law designates another
person. 
 Section 8.6. Reinstatement. 
 If the
Trustee or the Paying Agent is unable to apply any money deposited with respect to Securities of any Series in accordance with Section 8.1 by reason of any legal proceeding or by reason of any order or judgment of any court or governmental
authority enjoining, restraining or otherwise prohibiting such application, the obligations of the Company under this Indenture with respect to the Securities of such Series and under the Securities of such Series shall be revived and reinstated as
though no deposit had occurred pursuant to Section 8.1 until such time as the Trustee or the Paying Agent is permitted to apply all such money in accordance with Section 8.1; provided, however, that if the Company has made
any payment of principal of or interest on or any Additional Amounts with respect to any Securities because of the reinstatement of its obligations, the Company shall be subrogated to the rights of the Holders of such Securities to receive such
payment from the money or U.S. Government Obligations held by the Trustee or Paying Agent after payment in full to the Holders. 
 ARTICLE
IX. 
 AMENDMENTS AND WAIVERS 

Section 9.1. Without Consent of Holders. 
 The
Company and the Trustee may amend or supplement this Indenture or the Securities of one or more Series without the consent of any Securityholder: 
 (a) to
cure any ambiguity, defect or inconsistency; 
 (b) to comply with Article V; 

(c) to provide for uncertificated Securities in addition to or in place of certificated Securities; 

(d) to add guarantees with respect to Securities of any Series or secure Securities of any Series; 

(e) to surrender any of the Company’s rights or powers under this Indenture; 

(f) to add covenants or events of default for the benefit of the holders of Securities of any Series; 

  
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 (g) to comply with the applicable procedures of the applicable depositary; 

(h) to make any change that does not adversely affect the rights of any Securityholder; 

(i) to provide for the issuance of and establish the form and terms and conditions of Securities of any Series as permitted by this Indenture; 

(j) to evidence and provide for the acceptance of appointment hereunder by a successor Trustee with respect to the Securities of one or more Series and to add
to or change any of the provisions of this Indenture as shall be necessary to provide for or facilitate the administration of the trusts hereunder by more than one Trustee; or 

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

Section 9.2. With Consent of Holders. 
 9.2.1. The
following types of changes may require specific approval of all of the Holders: 
 (a) change the Stated Maturity of the principal of or rate of interest on
a Security; 
 (b) reduce the principal or any amounts due on a Security; 

(c) reduce the amount of principal payable upon acceleration of the Maturity of a Security following a Default; 

(d) at any time after a change of control has occurred, reduce any premium payable upon a change of control; 

(e) unless otherwise described in a supplemental indenture, change the place or currency of payment on a Security; 

(f) impair the right of Holders to sue for payment; 
 (g)
adversely affect any right to convert or exchange a Security in accordance with its terms; 
 (h) reduce the percentage of Holders of Securities whose
consent is needed to modify or amend this Indenture; 
 (i) reduce the percentage of Holders of Securities whose consent is needed to waive compliance with
certain provisions of this Indenture or to waive certain Defaults; 
 (j) modify any other aspect of the provisions of this Indenture dealing with
supplemental indenture, modification and waiver of past Defaults, changes to the quorum or voting requirements or the wavier of certain covenants; and 

(k) change any obligations the Company has to pay Additional Amounts. 

9.2.2. Any other change to this Indenture and the Securities shall require majority approval: 

(a) if the change affects only one Series of Securities, it must be approved by the Holders of a majority in principal amount of that Series; and 

(b) if the change affects more than one Series of Securities issued under the same indenture, it must be approved by the Holders of a majority in principal
amount of all of the Series affected by the change, with all affected Series voting together as one class for this purpose. 

  
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 The Holders of a majority in principal amount of all of the Series of Securities issued under this
Indenture, voting together as one class for this purpose, may waive Company compliance obligations with respect to some covenants in this Indenture. However, the Company cannot obtain a waiver of payment default or any of the matters in
Section 9.2.1. 
 Section 9.3. Compliance with Trust Indenture Act. 

Every amendment to this Indenture or the Securities of one or more Series shall be set forth in a supplemental indenture hereto that complies with the TIA as
then in effect. 
 Section 9.4. Revocation and Effect of Consents. 

Until an amendment is set forth in a supplemental indenture or a waiver becomes effective, a consent to it by a Holder of a Security is a continuing consent
by the Holder and every subsequent Holder of a Security or portion of a Security that evidences the same debt as the consenting Holder’s Security, even if notation of the consent is not made on any Security. However, any such Holder or
subsequent Holder may revoke the consent as to his Security or portion of a Security if the Trustee receives the notice of revocation before the date of the supplemental indenture or the date the waiver becomes effective. 

Any amendment or waiver once effective shall bind every Securityholder of each Series affected by such amendment or waiver unless it is of the type described
in Section 9.2.2. In that case, the amendment or waiver shall bind each Holder of a Security who has consented to it and every subsequent Holder of a Security or portion of a Security that evidences the same debt as the consenting Holder’s
Security. 
 The Company may, but shall not be obligated to, fix a record date for the purpose of determining the Holders entitled to give their consent or
take any other action described above or required or permitted to be taken pursuant to this Indenture. If a record date is fixed, then notwithstanding the second immediately preceding paragraph, those Persons who were Holders at such record date (or
their duly designated proxies), and only those persons, shall be entitled to give such consent or to revoke any consent previously given or take any such action, whether or not such Persons continue to be Holders after such record date. No such
consent shall be valid or effective for more than 120 days after such record date. 
 Section 9.5. Notation on or Exchange of Securities. 

The Company or the Trustee may place an appropriate notation about an amendment or waiver on any Security of any Series thereafter authenticated. The Company
in exchange for Securities of that Series may issue and the Trustee shall authenticate upon receipt of a Company Order in accordance with Section 2.3 new Securities of that Series that reflect the amendment or waiver. 

Section 9.6. Trustee Protected. 
 In executing, or
accepting the additional trusts created by, any supplemental indenture permitted by this Article or the modifications thereby of the trusts created by this Indenture, the Trustee shall be entitled to receive, and (subject to Section 7.1) shall
be fully protected in relying upon, an Officer’s Certificate or an Opinion of Counsel or both complying with Section 10.4. The Trustee shall sign all supplemental indentures upon delivery of such an Officer’s Certificate or Opinion of
Counsel or both, except that the Trustee need not sign any supplemental indenture that adversely affects its rights, duties, liabilities or immunities under this Indenture. 

ARTICLE X. 
 MISCELLANEOUS 

Section 10.1. Trust Indenture Act Controls. 
 If any
provision of this Indenture limits, qualifies, or conflicts with another provision which is required or deemed to be included in this Indenture by the TIA, such required or deemed provision shall control. 

  
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 Section 10.2. Notices. 

Any notice or communication by the Company or the Trustee to the other, or by a Holder to the Company or the Trustee, is duly given if in writing and
delivered in person or mailed by first-class mail (registered or certified, return receipt requested), facsimile transmission, email or overnight air courier guaranteeing next day delivery, to the others’ address: 

if to the Company: 
 Pyxis Oncology, Inc. 

150 Cambridgepark Drive 

Cambridge, MA 02140 
 Attention:
Chief Executive Officer 
 Telephone: (617) 221-9059 

with copies to: 
 Sidley Austin LLP 

787 Seventh Avenue 
 New York,
NY 10019 
 Attention: Frank Rahmani, Asher Rubin, Istvan A. Hajdu 

Telephone: (212) 839-5599 

if to the Trustee: 
 [ ] 

Attention: [ ] 

Telephone: [ ] 
 with a copy to: 

[ ] 
 Attention: [ ]

 Telephone: [ ] 
 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
Securityholder shall be sent electronically or by first-class mail to his, her or its address shown on the register kept by the Registrar, in accordance with the procedures of the Depositary. Failure to send a notice or communication to a
Securityholder of any Series or any defect in it shall not affect its sufficiency with respect to other Securityholders of that or any other Series. 
 If a
notice or communication is sent or published in the manner provided above, within the time prescribed, it is duly given, whether or not the Securityholder receives it. 

If the Company sends a notice or communication to Securityholders, it shall send a copy to the Trustee and each Agent at the same time. 

Notwithstanding any other provision of this Indenture or any Security, where this Indenture or any Security provides for notice of any event (including any
notice of redemption) to a Holder of a Global Security (whether by mail or otherwise), such notice shall be sufficiently given to the Depositary for such Security (or its designee) pursuant to the customary procedures of such Depositary. 

  
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 Section 10.3. Communication by Holders with Other Holders. 

Securityholders of any Series may communicate pursuant to TIA § 312(b) with other Securityholders of that Series or any other Series with respect to
their rights under this Indenture or the Securities of that Series or all Series. The Company, the Trustee, the Registrar and anyone else shall have the protection of TIA § 312(c). 

Section 10.4. Certificate and Opinion as to Conditions Precedent. 

Upon any request or application by the Company to the Trustee to take any action under this Indenture, the Company shall furnish to the Trustee: 

(a) an Officer’s Certificate stating that, in the opinion of the signers, all conditions precedent, if any, provided for in this Indenture relating to
the proposed action have been complied with; and 
 (b) an Opinion of Counsel stating that, in the opinion of such counsel, all such conditions precedent
have been complied with. 
 Section 10.5. Statements Required in Certificate or Opinion. 

Each certificate or opinion with respect to compliance with a condition or covenant provided for in this Indenture (other than a certificate provided pursuant
to TIA § 314(a)(4)) shall comply with the provisions of TIA § 314(e) and shall include: 
 (a) a statement that the person making such certificate
or opinion has read such covenant or condition; 
 (b) 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; 
 (c) a statement that, in the opinion of such person, 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 

(d) a statement as to whether or not, in the opinion of such person, such condition or covenant has been complied with. 

Section 10.6. Rules by Trustee and Agents. 
 The
Trustee may make reasonable rules for action by or a meeting of Securityholders of one or more Series. Any Agent may make reasonable rules and set reasonable requirements for its functions. 

Section 10.7. Legal Holidays. 
 A “Legal
Holiday” is any day that is not a Business Day. If a payment date is a Legal Holiday at a place of payment, payment may be made at that place on the next succeeding day that is not a Legal Holiday, and no interest shall accrue for the
intervening period. 
 Section 10.8. No Recourse Against Others. 

A director, officer, employee or stockholder (past or present), as such, of the Company shall not have any liability for any obligations of the Company under
the Securities or the Indenture or for any claim based on, in respect of or by reason of such obligations or their creation. Each Securityholder by accepting a Security waives and releases all such liability. The waiver and release are part of the
consideration for the issue of the Securities. 
 Section 10.9. Counterparts. 

This Indenture may be executed in any number of counterparts and by the parties hereto in separate counterparts, each of which when so executed shall be
deemed to be an original and all of which taken together shall constitute one and the same agreement. The exchange of copies of this Indenture and of signature pages by facsimile or PDF transmission shall constitute effective execution and delivery
of this Indenture as to the parties hereto and may be used in lieu of the original Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. 

  
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 Section 10.10. Governing Law; Waiver of Jury Trial; Consent to Jurisdiction. 

THIS INDENTURE AND THE SECURITIES, INCLUDING ANY CLAIM OR CONTROVERSY ARISING OUT OF OR RELATING TO THE INDENTURE OR THE SECURITIES, SHALL BE GOVERNED BY
THE LAWS OF THE STATE OF NEW YORK. 
 THE COMPANY, THE TRUSTEE AND THE HOLDERS (BY THEIR ACCEPTANCE OF THE SECURITIES) EACH HEREBY IRREVOCABLY WAIVE,
TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS INDENTURE, THE NOTES OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY. 

Any legal suit, action or proceeding arising out of or based upon this Indenture or the transactions contemplated hereby may be instituted in the federal
courts of the United States of America located in the City of New York or the courts of the State of New York in each case located in the City of New York (collectively, the “Specified Courts”), and each party irrevocably submits to
the non exclusive jurisdiction of such courts in any such suit, action or proceeding. Service of any process, summons, notice or document by mail (to the extent allowed under any applicable statute or rule of court) to such party’s address set
forth above shall be effective service of process for any suit, action or other proceeding brought in any such court. The Company, the Trustee and the Holders (by their acceptance of the Securities) each hereby irrevocably and unconditionally waive
any objection to the laying of venue of any suit, action or other proceeding in the Specified Courts and irrevocably and unconditionally waive and agree not to plead or claim any such suit, action or other proceeding has been brought in an
inconvenient forum. 
 Section 10.11. No Adverse Interpretation of Other Agreements. 

This Indenture may not be used to interpret another indenture, loan or debt agreement of the Company or a Subsidiary of the Company. Any such indenture, loan
or debt agreement may not be used to interpret this Indenture. 
 Section 10.12. Successors. 

All agreements of the Company in this Indenture and the Securities shall bind its successor. All agreements of the Trustee in this Indenture shall bind its
successor. 
 Section 10.13. Severability. 
 In
case any provision in this Indenture or in the Securities shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby. 

Section 10.14. Table of Contents, Headings, Etc. 

The Table of Contents, Cross Reference Table, and headings of the Articles and Sections of this Indenture have been inserted for convenience of reference
only, are not to be considered a part hereof, and shall in no way modify or restrict any of the terms or provisions hereof. 
 Section 10.15.
Securities in a Foreign Currency. 
 Unless otherwise specified in a Board Resolution, a supplemental indenture hereto or an Officer’s
Certificate delivered pursuant to Section 2.2 of this Indenture with respect to a particular Series of Securities, whenever for purposes of this Indenture any action may be taken by the Holders of a specified percentage in aggregate principal
amount of Securities of all Series or all Series affected by a particular action at the time outstanding and, at such time, there are outstanding Securities of any Series which are denominated in more than one currency, then the principal amount of
Securities of such Series which shall be deemed to be outstanding for the purpose of taking such action shall be determined by converting any such other currency into a currency that is designated upon issuance of


  
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any particular Series of Securities. Unless otherwise specified in a Board Resolution, a supplemental indenture hereto or an Officer’s Certificate delivered pursuant to Section 2.2 of
this Indenture with respect to a particular Series of Securities, such conversion shall be at the spot rate for the purchase of the designated currency as published in The Financial Times in the “Currency Rates” section (or, if The
Financial Times is no longer published, or if such information is no longer available in The Financial Times, such source as may be selected in good faith by the Company) on any date of determination. The provisions of this paragraph shall apply in
determining the equivalent principal amount in respect of Securities of a Series denominated in currency other than Dollars in connection with any action taken by Holders of Securities pursuant to the terms of this Indenture. 

All decisions and determinations provided for in the preceding paragraph shall, in the absence of manifest error, to the extent permitted by law, be
conclusive for all purposes and irrevocably binding upon the Trustee and all Holders. 
 Section 10.16. Judgment Currency. 

The Company agrees, to the fullest extent that it may effectively do so under applicable law, that (a) if for the purpose of obtaining judgment in any
court it is necessary to convert the sum due in respect of the principal of or interest or other amount on the Securities of any Series (the “Required Currency”) into a currency in which a judgment will be rendered (the
“Judgment Currency”), the rate of exchange used shall be the rate at which in accordance with normal banking procedures the Trustee could purchase in The City of New York the Required Currency with the Judgment Currency on the day
on which final unappealable judgment is entered, unless such day is not a New York Banking Day, then the rate of exchange used shall be the rate at which in accordance with normal banking procedures the Trustee could purchase in The City of New York
the Required Currency with the Judgment Currency on the New York Banking Day preceding the day on which final unappealable judgment is entered and (b) its obligations under this Indenture to make payments in the Required Currency (i) shall
not be discharged or satisfied by any tender, any recovery pursuant to any judgment (whether or not entered in accordance with subsection (a)), in any currency other than the Required Currency, except to the extent that such tender or recovery shall
result in the actual receipt, by the payee, of the full amount of the Required Currency expressed to be payable in respect of such payments, (ii) shall be enforceable as an alternative or additional cause of action for the purpose of recovering
in the Required Currency the amount, if any, by which such actual receipt shall fall short of the full amount of the Required Currency so expressed to be payable, and (iii) shall not be affected by judgment being obtained for any other sum due
under this Indenture. For purposes of the foregoing, “New York Banking Day” means any day except a Saturday, Sunday or a legal holiday in The City of New York on which banking institutions are authorized or required by law,
regulation or executive order to close. 
 Section 10.17. Force Majeure. 

In no event shall the Trustee be responsible or liable for any failure or delay in the performance of its obligations hereunder arising out of or caused by,
directly or indirectly, forces beyond its control, including, without limitation, strikes, work stoppages, accidents, acts of war or terrorism, civil or military disturbances, nuclear or natural catastrophes or acts of God, and interruptions, loss
or malfunctions of utilities, communications or computer (software and hardware) services, it being understood that the Trustee shall use reasonable best efforts which are consistent with accepted practices in the banking industry to resume
performance as soon as practicable under the circumstances. 
 Section 10.18. U.S.A. Patriot Act. 

The parties hereto acknowledge that in accordance with Section 326 of the U.S.A. Patriot Act, the Trustee is required to obtain, verify, and record
information that identifies each person or legal entity that establishes a relationship or opens an account with the Trustee. The parties to this Indenture agree that they will provide the Trustee with such information as it may request in order for
the Trustee to satisfy the requirements of the U.S.A. Patriot Act. 

  
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 ARTICLE XI. 

SINKING FUNDS 
 Section 11.1.
Applicability of Article. 
 The provisions of this Article shall be applicable to any sinking fund for the retirement of the Securities of a Series
if so provided by the terms of such Securities pursuant to Section 2.2 and except as otherwise permitted or required by any form of Security of such Series issued pursuant to this Indenture. 

The minimum amount of any sinking fund payment provided for by the terms of the Securities of any Series is herein referred to as a “mandatory sinking
fund payment” and any other amount provided for by the terms of Securities of such Series is herein referred to as an “optional sinking fund payment.” If provided for by the terms of Securities of any Series, the cash
amount of any sinking fund payment may be subject to reduction as provided in Section 11.2. Each sinking fund payment shall be applied to the redemption of Securities of any Series as provided for by the terms of the Securities of such Series.

 Section 11.2. Satisfaction of Sinking Fund Payments with Securities. 

The Company may, in satisfaction of all or any part of any sinking fund payment with respect to the Securities of any Series to be made pursuant to the terms
of such Securities (1) deliver outstanding Securities of such Series to which such sinking fund payment is applicable (other than any of such Securities previously called for mandatory sinking fund redemption) and (2) apply as credit
Securities of such Series to which such sinking fund payment is applicable and which have been repurchased by the Company or redeemed either at the election of the Company pursuant to the terms of such Series of Securities (except pursuant to any
mandatory sinking fund) or through the application of permitted optional sinking fund payments or other optional redemptions pursuant to the terms of such Securities, provided that such Securities have not been previously so credited. Such
Securities shall be received by the Trustee, together with an Officer’s Certificate with respect thereto, not later than 15 days prior to the date on which the Trustee begins the process of selecting Securities for redemption, and shall be
credited for such purpose by the Trustee at the price specified in such Securities for redemption through operation of the sinking fund and the amount of such sinking fund payment shall be reduced accordingly. If as a result of the delivery or
credit of Securities in lieu of cash payments pursuant to this Section 11.2, the principal amount of Securities of such Series to be redeemed in order to exhaust the aforesaid cash payment shall be less than $100,000, the Trustee need not call
Securities of such Series for redemption, except upon receipt of a Company Order that such action be taken, and such cash payment shall be held by the Trustee or a Paying Agent and applied to the next succeeding sinking fund payment,
provided, however, that the Trustee or such Paying Agent shall from time to time upon receipt of a Company Order pay over and deliver to the Company any cash payment so being held by the Trustee or such Paying Agent upon delivery by
the Company to the Trustee of Securities of that Series purchased by the Company having an unpaid principal amount equal to the cash payment required to be released to the Company. 

Section 11.3. Redemption of Securities for Sinking Fund. 

Not less than 45 days (unless otherwise indicated in the Board Resolution, supplemental indenture hereto or Officer’s Certificate in respect of a
particular Series of Securities) prior to each sinking fund payment date for any Series of Securities, the Company will deliver to the Trustee an Officer’s Certificate specifying the amount of the next ensuing mandatory sinking fund payment for
that Series pursuant to the terms of that Series, the portion thereof, if any, which is to be satisfied by payment of cash and the portion thereof, if any, which is to be satisfied by delivering and crediting of Securities of that Series pursuant to
Section 11.2, and the optional amount, if any, to be added in cash to the next ensuing mandatory sinking fund payment, and the Company shall thereupon be obligated to pay the amount therein specified. Not less than 30 days (unless otherwise
indicated in the Board Resolution, Officer’s Certificate or supplemental indenture in respect of a particular Series of Securities) before each such sinking fund payment date the Securities to be redeemed upon such sinking fund payment date
will be selected in the manner specified in Section 3.2 and the Company shall send or cause to be sent a notice of the redemption thereof to be given in the name of and at the expense of the Company in the manner provided in and in accordance
with Section 3.3. Such notice having been duly given, the redemption of such Securities shall be made upon the terms and in the manner stated in Sections 3.4, 3.5 and 3.6. 

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

			
	PYXIS ONCOLOGY, INC.
		
	By:	 	  

		 	Name:
		 	Its:


  

			
	[ ], as Trustee
		
	By:	 	  

		 	Name:
		 	Its:



  
 33