Document:

Second Supplemental Indenture

 Exhibit 4.1 
 SECOND SUPPLEMENTAL INDENTURE 
 SECOND SUPPLEMENTAL INDENTURE (this
“Second Supplemental Indenture”), dated as of April 4, 2012, by and among Lyondell Chemical Company, a Delaware Corporation (the “Issuer”), LyondellBasell Industries N.V., a public company with limited
liability (naamloze vennootschap) in the country of the Netherlands (the “Company”), and Wilmington Trust, National Association, as successor by merger to Wilmington Trust FSB, as trustee under the Indenture referred to below
(the “Trustee”). 
 WITNESSETH 
 WHEREAS, the Issuer, the Company and the other Guarantors (as defined in the Indenture referred to herein) have heretofore executed and delivered to the Trustee an Amended and Restated Indenture, dated as
of April 30, 2010 (the “Base Indenture”), providing for the issuance of 8% Senior Secured Dollar Notes due 2017 and 8% Senior Secured Euro Notes due 2017 (collectively, the “Notes”); 

WHEREAS, the Issuer, the Company and the Trustee have executed the First Supplemental Indenture to the Base Indenture, dated as of
November 2, 2011 (together with the Base Indenture, the “Indenture”), amending certain terms and conditions of the Base Indenture; 
 WHEREAS, the Issuer has distributed an Offer to Purchase and Consent Solicitation Statement, dated as of March 26, 2012 (the “Statement”), with an accompanying Letter of Transmittal
and Consent (the “Letter of Transmittal”), to holders (as such term is defined in the Base Indenture) in connection with the offer to purchase for cash any and all of the outstanding Notes and the concurrent solicitation of such
holders’ consents to certain proposed amendments to the Indenture; 
 WHEREAS, pursuant to Section 9.02 of the
Indenture, the Trustee is authorized to execute and deliver this Second Supplemental Indenture; 
 WHEREAS, pursuant to the
Statement, the holders of at least a majority in aggregate principal amount of the Notes outstanding (excluding, in each case, any Notes owned by the Issuer, the Company or by any Person directly or indirectly controlling or controlled by or under
direct or indirect common control with the Issuer or the Company) have consented to all of the amendments effected by this Second Supplemental Indenture in accordance with the provisions of the Indenture, evidence of such consents has been provided
by the Issuer to the Trustee and all other conditions precedent, if any, provided for in the Indenture relating to the execution of this Second Supplemental Indenture have been complied with as of the date hereof; and 

WHEREAS, all acts and requirements necessary to make this Second Supplemental Indenture the legal, valid and binding obligation of the
Issuer and the Company have been done. 
 NOW THEREFORE, in consideration of the foregoing and for other good and valuable
consideration, the receipt of which is hereby acknowledged, the parties agree as follows: 
 ARTICLE I 

DEFINITIONS 

SECTION 1.01. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the
Indenture. 
 SECTION 1.02. DEFINITION. When used herein, “Trigger Event” shall mean the occurrence of each of
the following events: the Issuer’s payment to holders of (a) the applicable Total 

  
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Consideration (as such term is defined in the Statement) payable as of each applicable Early Settlement Date (as such term is defined in the Statement) and (b) if any Notes are tendered
after the applicable Consent Payment Expiration (as such term is defined in the Statement) and before the applicable Expiration Time (as such term is defined in the Statement), the applicable Tender Offer Consideration (as such term is defined in
the Statement) payable as of the applicable Final Settlement Date, pursuant to the terms and conditions of the Statement and the Letter of Transmittal. 
 ARTICLE II 
 AMENDMENTS TO THE INDENTURE 

SECTION 2.01. CONSENT AND AMENDMENT. Effective upon the Trigger Event, and without any further action by any party hereto, the Indenture
is hereby amended as follows: 
 (a) Section 4.03 (Limitation on Incurrence of Indebtedness and Issuance of Disqualified
Stock and Preferred Stock) is hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 4.03 are hereby deleted.

 (b) Section 4.04 (Limitation on Restricted Payments) is hereby deleted in its entirety and replaced with the text
“[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 4.04 are hereby deleted. 
 (c) Section 4.05 (Dividend and Other Payment Restrictions Affecting Subsidiaries) is hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual
references in the Indenture and the Notes exclusively relating to Section 4.05 are hereby deleted. 
 (d)
Section 4.06 (Asset Sales) is hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 4.06 are hereby
deleted. 
 (e) Section 4.07 (Transactions with Affiliates) is hereby deleted in its entirety and replaced with the
text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 4.07 are hereby deleted. 
 (f) Section 4.08 (Change of Control) is hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes
exclusively relating to Section 4.08 are hereby deleted. 
 (g) Section 4.11 (Future Subsidiary Guarantors) is
hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 4.11 are hereby deleted. 

(h) Section 4.12 (Liens) is hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All
textual references in the Indenture and the Notes exclusively relating to Section 4.12 are hereby deleted. 
 (i)
Section 5.01 (When Issuer May Merge or Transfer Assets) is hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to
Section 5.01 are hereby deleted. 

  
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 (j) The text of Section 4.02 (Reports and Other Information) shall be amended and
restated in its entirety as follows: 
 SECTION 4.02. Reports and Other Information. 

The Issuer shall comply with the provisions of TIA Section 314(a), to the extent applicable. 

The Issuer shall, for so long as any Notes remain outstanding during any period when it is not subject to Section 13 or 15(d) of the
Exchange Act, or otherwise permitted to furnish the SEC with certain information pursuant to Rule 12g3-2(b) of the Exchange Act, furnish to the holders of the Notes and to prospective investors, upon their request, the information required to be
delivered pursuant to Rule 144A(d)(4) under the Securities Act. 
 ARTICLE III 

MISCELLANEOUS 

SECTION 3.01. RATIFICATION OF INDENTURE; SECOND SUPPLEMENTAL INDENTURE PART OF INDENTURE. Except as expressly amended hereby, the
Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Second Supplemental Indenture shall form a part of the Indenture for all purposes, and every holder
of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. 
 SECTION 3.02. GOVERNING LAW. THIS
SECOND SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAW. 
 SECTION 3.03. TRUSTEE MAKES NO REPRESENTATION. The Trustee makes no representation as to the validity or sufficiency of this Second Supplemental Indenture. 

SECTION 3.04. COUNTERPARTS. The parties may sign any number of copies of this Second Supplemental Indenture. Each signed copy shall be an
original, but all of them together represent the same agreement. 
 SECTION 3.05. EFFECT OF HEADINGS. The Section headings
herein are for convenience only and shall not affect the construction hereof. 
 SECTION 3.06. SEPARABILITY. In case any
provision in this Second Supplemental Indenture is invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby. 

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

			
	 LYONDELL CHEMICAL COMPANY,
 as the Issuer

		
	By:	 	 
	Name:	 	Francesco Svelto
	Title:	 	Treasurer
	
	 LYONDELLBASELL INDUSTRIES N.V.,
 as the Company

		
	By:	 	 
	Name:	 	Francesco Svelto
	Title:	 	Attorney

 [Signature Page to Second Supplemental Indenture – 8% Notes] 

 
			
	 WILMINGTON TRUST, NATIONAL ASSOCIATION,
 as Trustee

		
	By:	 	 
	Name:	 	
	Title:	 	

 [Signature Page to Second Supplemental Indenture – 8% Notes]Second Supplemental Indenture

 Exhibit 4.2 
 SECOND SUPPLEMENTAL INDENTURE 
 SECOND SUPPLEMENTAL INDENTURE (this
“Second Supplemental Indenture”), dated as of April 4, 2012, by and among Lyondell Chemical Company, a Delaware Corporation (the “Issuer”), LyondellBasell Industries N.V., a public company with limited
liability (naamloze vennootschap) in the country of the Netherlands (the “Company”), and Wells Fargo Bank, National Association, as trustee under the Indenture referred to below (the “Trustee”). 

WITNESSETH 

WHEREAS, the Issuer, the Company and the other Guarantors (as defined in the Indenture referred to herein) have heretofore executed and
delivered to the Trustee an Indenture dated as of April 30, 2010 (the “Base Indenture”), providing for the issuance of 11% Senior Secured Notes due 2018 (the “Notes”); 

WHEREAS, the Issuer, the Company and the Trustee have executed the First Supplemental Indenture to the Base Indenture, dated as of
November 2, 2011 (together with the Base Indenture, the “Indenture”), amending certain terms and conditions of the Base Indenture; 
 WHEREAS, the Issuer has distributed an Offer to Purchase and Consent Solicitation Statement, dated as of March 26, 2012 (the “Statement”), with an accompanying Letter of Transmittal
and Consent (the “Letter of Transmittal”), to holders (as such term is defined in the Base Indenture) in connection with the offer to purchase for cash any and all of the outstanding Notes and the concurrent solicitation of such
holders’ consents to certain proposed amendments to the Indenture; 
 WHEREAS, pursuant to Section 9.02 of the
Indenture, the Trustee is authorized to execute and deliver this Second Supplemental Indenture; 
 WHEREAS, pursuant to the
Statement, the holders of at least a majority in aggregate principal amount of the Notes outstanding (excluding, in each case, any Notes owned by the Issuer, the Company or by any Person directly or indirectly controlling or controlled by or under
direct or indirect common control with the Issuer or the Company) have consented to all of the amendments effected by this Second Supplemental Indenture in accordance with the provisions of the Indenture, evidence of such consents has been provided
by the Issuer to the Trustee and all other conditions precedent, if any, provided for in the Indenture relating to the execution of this Second Supplemental Indenture have been complied with as of the date hereof; and 

WHEREAS, all acts and requirements necessary to make this Second Supplemental Indenture the legal, valid and binding obligation of the
Issuer and the Company have been done. 
 NOW THEREFORE, in consideration of the foregoing and for other good and valuable
consideration, the receipt of which is hereby acknowledged, the parties agree as follows: 
 ARTICLE I 

DEFINITIONS 

SECTION 1.01. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the
Indenture. 
 SECTION 1.02. DEFINITION. When used herein, “Trigger Event” shall mean the occurrence of each of
the following events: the Issuer’s payment to holders of (a) the applicable Total 

  
 1 

 
Consideration (as such term is defined in the Statement) payable as of the applicable Early Settlement Date (as such term is defined in the Statement) and (b) if any Notes are tendered after
the applicable Consent Payment Expiration (as such term is defined in the Statement) and before the applicable Expiration Time (as such term is defined in the Statement), the Tender Offer Consideration (as such term is defined in the Statement)
payable as of the Final Settlement Date, pursuant to the terms and conditions of the Statement and the Letter of Transmittal. 

ARTICLE II 

AMENDMENTS TO THE INDENTURE 
 SECTION 2.01. CONSENT AND AMENDMENT. Effective upon the Trigger Event, and without any further action by any party hereto, the Indenture is hereby amended as follows: 

(a) Section 4.03 (Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock and Preferred Stock) is hereby
deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 4.03 are hereby deleted. 

(b) Section 4.04 (Limitation on Restricted Payments) is hereby deleted in its entirety and replaced with the text
“[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 4.04 are hereby deleted. 
 (c) Section 4.05 (Dividend and Other Payment Restrictions Affecting Subsidiaries) is hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual
references in the Indenture and the Notes exclusively relating to Section 4.05 are hereby deleted. 
 (d)
Section 4.06 (Asset Sales) is hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 4.06 are hereby
deleted. 
 (e) Section 4.07 (Transactions with Affiliates) is hereby deleted in its entirety and replaced with the
text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 4.07 are hereby deleted. 
 (f) Section 4.08 (Change of Control) is hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes
exclusively relating to Section 4.08 are hereby deleted. 
 (g) Section 4.11 (Future Subsidiary Guarantors) is
hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 4.11 are hereby deleted. 

(h) Section 4.12 (Liens) is hereby deleted in its entirety and replaced with the text “[Intentionally Omitted.]” All
textual references in the Indenture and the Notes exclusively relating to Section 4.12 are hereby deleted. 

(i) Section 5.01 (When Issuer May Merge or Transfer Assets) is hereby deleted in its entirety and replaced with the text
“[Intentionally Omitted.]” All textual references in the Indenture and the Notes exclusively relating to Section 5.01 are hereby deleted. 

  
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 (j) The text of Section 4.02 (Reports and Other Information) shall be amended and
restated in its entirety as follows: 
 SECTION 4.02. Reports and Other Information. 

The Issuer shall comply with the provisions of TIA Section 314(a), to the extent applicable. 

The Issuer shall, for so long as any Notes remain outstanding during any period when it is not subject to Section 13 or 15(d) of the
Exchange Act, or otherwise permitted to furnish the SEC with certain information pursuant to Rule 12g3-2(b) of the Exchange Act, furnish to the holders of the Notes and to prospective investors, upon their request, the information required to be
delivered pursuant to Rule 144A(d)(4) under the Securities Act. 
 ARTICLE III 

MISCELLANEOUS 

SECTION 3.01. RATIFICATION OF INDENTURE; SECOND SUPPLEMENTAL INDENTURE PART OF INDENTURE. Except as expressly amended hereby, the
Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Second Supplemental Indenture shall form a part of the Indenture for all purposes, and every holder
of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. 
 SECTION 3.02. GOVERNING LAW. THIS
SECOND SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAW. 
 SECTION 3.03. TRUSTEE MAKES NO REPRESENTATION. The Trustee makes no representation as to the validity or sufficiency of this Second Supplemental Indenture. 

SECTION 3.04. COUNTERPARTS. The parties may sign any number of copies of this Second Supplemental Indenture. Each signed copy shall be an
original, but all of them together represent the same agreement. 
 SECTION 3.05. EFFECT OF HEADINGS. The Section headings
herein are for convenience only and shall not affect the construction hereof. 
 SECTION 3.06. SEPARABILITY. In case any
provision in this Second Supplemental Indenture is invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby. 

  
 3 

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

			
	 LYONDELL CHEMICAL COMPANY,
 as the Issuer

		
	By:	 	 
	Name:	 	Francesco Svelto
	Title:	 	Treasurer
	
	 LYONDELLBASELL INDUSTRIES N.V.,
 as the Company

		
	By:	 	 
	Name:	 	Francesco Svelto
	Title:	 	Attorney

 [Signature Page to Second Supplemental Indenture – 11% Notes] 

 
			
	 WELLS FARGO BANK, NATIONAL ASSOCIATION,
 as Trustee

		
	By:	 	 
	Name:	 	
	Title:	 	

 [Signature Page to Second Supplemental Indenture – 11% Notes]

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