EX-4.31





 Exhibit 4.31 

THIRD SUPPLEMENTAL INDENTURE 

THIRD SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of September 10, 2021, among Indigo Natural
Resources LLC, a Delaware limited liability company (the “Guaranteeing Subsidiary”), a subsidiary of Southwestern Energy Company, a Delaware corporation (the “Company”), the other Security Guarantors named therein
(as defined in the Indenture referred to below), and Regions Bank, as trustee under the Indenture referred to below (in such capacity, the “Trustee”). 

W I T N E S S E T H 
 WHEREAS,
the Company and the Trustee have heretofore entered into an Indenture dated as of August 30, 2021 (the “Base Indenture”) providing for the issuance from time to time of Securities in one or more series; 

WHEREAS, the Company, the other Security Guarantors named therein, as applicable, and the Trustee have heretofore entered into a First
Supplemental Indenture dated as of August 30, 2021 (the “First Supplemental Indenture”) amending and supplementing the Base Indenture and establishing a series of Securities designated as the Company’s 5.375% Senior Notes
due 2030 (the “Notes”); 
 WHEREAS, the Base Indenture, as amended and supplemented by the First Supplemental Indenture,
provides that under certain circumstances the Guaranteeing Subsidiary shall execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing Subsidiary shall guarantee all of the Company’s obligations under the
Notes and the Indenture (but only with respect to the Notes, and not with respect to any other series of Securities) on the terms and conditions set forth in the Indenture; 

WHEREAS, the Base Indenture, as supplemented from time to time, including without limitation pursuant to this Supplemental Indenture, is
referred to herein as the “Indenture;” and 
 WHEREAS, pursuant to Sections 10.01 and 10.06 of the Base Indenture, the
Trustee is authorized to execute and deliver this Supplemental Indenture; 
 NOW THEREFORE, in consideration of the foregoing and for other
good and valuable consideration, the receipt of which is hereby acknowledged, the Company, the Guaranteeing Subsidiary and the Trustee, as applicable, mutually covenant and agree for the equal and ratable benefit of the Holders of Notes as follows:

 ARTICLE ONE 

RELATION TO INDENTURE; DEFINITIONS 

SECTION 1.01 Relation to Indenture. 

With respect to the Notes, this Supplemental Indenture constitutes an integral part of the Indenture. 

  
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 SECTION 1.02 Definitions. 

For all purposes of this Supplemental Indenture, capitalized terms used herein and not otherwise defined herein shall have the meanings
assigned thereto in the Base Indenture, as heretofore amended and supplemented. 
 SECTION 1.03 General
References. 
 Unless otherwise specified or unless the context otherwise requires, (i) all references in this
Supplemental Indenture to Articles and Sections refer to the corresponding Articles and Sections of this Supplemental Indenture and (ii) the terms “herein”, “hereof”, “hereunder” and any other
word of similar import refer to this Supplemental Indenture. 
 ARTICLE TWO 

SUBSIDIARY GUARANTEE 

SECTION 2.01 Agreement To Guarantee. 

The Guaranteeing Subsidiary hereby guarantees all of the Company’s obligations under the Notes and the Indenture (but only with respect to
the Notes, and not with respect to any other series of Securities) on the terms and subject to the conditions set forth in the Indenture, including without limitation in Article XI of the Indenture and Article VII of the First Supplemental
Indenture and shall be deemed to be a Security Guarantor with respect to the Notes for all purposes under the Indenture. 
 ARTICLE THREE

 MISCELLANEOUS 

SECTION 3.01. Certain Trustee Matters. 

The recitals contained herein shall be taken as the statements of the Company and the Guaranteeing Subsidiary, and the Trustee assumes no
responsibility for their correctness. 
 The Trustee makes no representations as to the validity or sufficiency of this Supplemental
Indenture or the Notes or any Securities Guarantee or the proper authorization or the due execution hereof or thereof by the Company. 

Except as expressly set forth herein, nothing in this Supplemental Indenture shall alter the duties, rights or obligations of the Trustee set
forth in the Base Indenture, as heretofore amended and supplemented. 
 SECTION 3.02. Continued
Effect. 
 Except as expressly supplemented and amended by this Supplemental Indenture, the Base Indenture, as heretofore
amended and supplemented, shall continue in full force and effect in accordance with the provisions thereof, and the Base Indenture, as heretofore amended and supplemented, is in all respects hereby ratified and confirmed. This Supplemental
Indenture and all its provisions shall be deemed a part of the Indenture, in the manner and to the extent herein and therein provided. 

  
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 SECTION 3.03. Governing Law. 

This Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of New York. 

SECTION 3.04. Counterparts. 

This Supplemental Indenture may be executed in any number of counterparts, each of which when so executed shall be deemed an original; and all
such counterparts shall together constitute but one and the same instrument. Delivery of an executed counterpart of this Supplemental Indenture by facsimile or electronic transmission shall be equally as effective as delivery of an original executed
counterpart of this Supplemental Indenture. The words “execution,” “signed,” “signature,” “delivery,” and words of like import in or relating to this Supplemental Indenture or any document to be signed in
connection with this Supplemental Indenture shall be deemed to include electronic signatures deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed
signature, physical delivery thereof or the use of a paper-based recordkeeping system, as the case may be, and the parties hereto consent to conduct the transactions contemplated hereunder by electronic means. 

SECTION 3.05 Effect of Headings. 

The Article and Section headings in this Supplemental Indenture are for convenience only and shall not affect the construction hereof. 

(Remainder of Page Intentionally Left Blank) 

  
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 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed and attested, all as of the date first above written. 
 Dated: September 10, 2021 

 

	
	A.W. REALTY COMPANY, LLC
	ANGELINA GATHERING COMPANY, L.L.C.
	INDIGO NATURAL RESOURCES LLC
	SWN DRILLING COMPANY, LLC
	SWN E & P SERVICES, LLC
	SWN ENERGY SERVICES COMPANY, LLC
	SWN INTERNATIONAL, LLC
	SWN MIDSTREAM SERVICES COMPANY, LLC
	SWN PRODUCER SERVICES, LLC
	 SWN PRODUCTION COMPANY, LLC
 SWN
PRODUCTION (OHIO), LLC

	SWN WATER RESOURCES COMPANY, LLC
	SWN WELL SERVICES, LLC


  

			
	By:	 	 /s/ Carl Giesler, Jr.

	Name: Carl Giesler, Jr.
	Title: Executive Vice President and Chief Financial Officer
	
	SOUTHWESTERN ENERGY COMPANY
		
	By:	 	 /s/ Carl Giesler, Jr.

	Name: Carl Giesler, Jr.
	Title: Executive Vice President and Chief Financial Officer



  
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	TRUSTEE
	
	REGIONS BANK, as Trustee
		
	By:	 	 James C. Henry

		 	Authorized Signatory



  
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