Document:

EX-4.1

 Exhibit 4.1 

EXECUTION VERSION  

FIRST SUPPLEMENTAL INDENTURE 

This First Supplemental Indenture, dated as of November 29, 2017 (this “Supplemental Indenture”), between Southwestern
Energy Company, a Delaware corporation (the “Company”), and The Bank of New York Mellon Trust Company, N.A., as Trustee (the “Trustee”) under the Indenture referred to below. 

WITNESSETH 
 WHEREAS, the Company
and the Trustee have heretofore executed and delivered an Indenture (the “Indenture”), dated as of March 5, 2012, providing for the issuance by the Company of the 4.10% Senior Notes due 2022 (the “2022 Notes”);

 WHEREAS, pursuant to Section 9.2 of the Indenture, the Company and the Trustee are authorized to execute and deliver this
Supplemental Indenture with the consent of the holders of at least a majority of the outstanding principal amount of the series of Notes affected by such amendment; 

WHEREAS, the Company has solicited consents from the holders of the 2022 Notes (the “Consent Solicitation”) pursuant to a
Consent Solicitation Statement, dated November 21, 2017 (the “Consent Solicitation Statement”), to certain proposed amendments (the “Proposed Amendments”) to the Indenture with respect to the 2022 Notes as
described in the Consent Solicitation Statement and set forth in Section 2 of this Supplemental Indenture, with the operation of such Proposed Amendments with respect to the 2022 Notes being subject to the satisfaction or waiver, where
permissible, by the Company of the conditions to the Consent Solicitation Statement, and the payment of the consent payment payable pursuant to the Consent Solicitation Statement (the “Consent Payment”); 

WHEREAS, the Company has received and caused to be delivered to the Trustee evidence of the consents from holders of a majority in outstanding
principal amount of the 2022 Notes (excluding any 2022 Notes owned by the Company or by any person directly or indirectly controlling or controlled by or under direct or indirect common control with the Company); 

WHEREAS, the Company is undertaking to execute and deliver this Supplemental Indenture to amend certain provisions and covenants in the
Indenture with respect to the 2022 Notes in connection with the Consent Solicitation; 
 WHEREAS, all acts and requirements necessary to
make this Supplemental Indenture a legal, valid and binding obligation of the Company have been done; 
 WHEREAS, the Company has requested
and hereby requests that the Trustee join with the Company in the execution of this Supplemental Indenture and Company has provided the Trustee with a Board Resolution authorizing the execution of and approving this Supplemental Indenture; and 

WHEREAS, the terms hereof will become operative upon the payment by the Company of the Consent Payment in respect of the 2022 Notes. 

 NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration,
the receipt of which is hereby acknowledged, the Company and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the 2022 Notes as follows: 

1.    Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them
in the Indenture. 
 2.    Certain Amendments to the Indenture and the 2022 Notes. The following amendments to
the Indenture shall apply with respect to the 2022 Notes. 
 (a) Section 3.7. Limitation on Liens of the Indenture shall be
deleted in its entirety and replaced with the following: 
 Section 3.7. Limitation on Liens. The
Company will not, and will not permit any of its Subsidiaries to, incur, assume or guarantee any indebtedness for borrowed money secured by a lien on (a) Productive Property, (b) any Principal Transmission Facility or (c) any shares
of stock of any Subsidiary (collectively, (a), (b) and (c), “Principal Property”), if the sum, without duplication, of: 

(a)    the aggregate principal amount of all Secured Debt of the Company and its Subsidiaries (other than Secured Debt
secured by a Permitted Lien); and 
 (b)    all Attributable Debt of the Company or its Subsidiaries in respect of Sale
and Leaseback Transactions involving any Principal Property (other than Permitted Sale and Leaseback Transactions), 
 exceeds the greater of
$2.0 billion or 25% of the Company’s ACNTA at the time of incurrence, unless the Company provides that the Notes will be secured equally and ratably with (or, at the Company’s option, prior to) such Secured Debt. 

(b) Section 3.8. Restriction of Sale-Leaseback Transactions of the Indenture shall be deleted in its entirety and
replaced with the following: 
 Section 3.8. Restriction of Sale-Leaseback Transactions. Neither the
Company nor any of its Subsidiaries shall enter into, assume, guarantee or otherwise become liable with respect to any Sale and Leaseback Transaction involving any Principal Property, unless after giving effect thereto the sum of all Attributable
Debt in respect of such Sale and Leaseback Transactions (other than Permitted Sale and Leaseback Transactions) does not exceed $250.0 million. 

(c) The following Section 3.10. Future Subsidiary Guarantors covenant shall be added to the Indenture in its
entirety: 
 Section 3.10. Future Subsidiary Guarantors. As of the date of this Supplemental
Indenture, the Notes shall not be guaranteed by any of the Company’s existing Subsidiaries. If, after the date of this Supplemental Indenture, any of the Company’s Subsidiaries guarantees, becomes a borrower or guarantor under, or grants
any Lien to secure any obligations pursuant to (i) the Senior Credit Facility or any future Credit Facility or (ii) any other indebtedness for 

  
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money borrowed in excess of $500.0 million, then the Company shall cause such Subsidiary to become a Note Guarantor by executing a supplement to the Indenture and delivering such supplement
to the Trustee promptly (but in any event, within ten Business Days of the date on which it guaranteed or incurred such obligations or granted such Lien, as the case may be) in accordance with Article X of the Indenture. 

(d) The definition of Consolidated Assets in the Indenture shall be deleted in its entirety. 

(e) The following definitions shall be added to the Indenture in the applicable alphabetical order: 

“ACNTA” means (without duplication), as of the date of determination: 

(a)    the sum of: 

(i)    discounted future net revenue from proved crude oil and natural gas reserves of the Company and its
Subsidiaries calculated in accordance with SEC guidelines before any state or federal income taxes, as estimated in a reserve report prepared as of the end of the Company’s most recently completed fiscal year, which reserve report is prepared
or audited by independent petroleum engineers as to at least 80% of the value of the reserves covered thereby, provided, however, that in lieu of using commodities prices and costs determined under SEC guidelines in such reserve report and for all
purposes of this definition, such discounted future net revenue shall be adjusted using NYMEX prices after giving further effect to commodity derivatives contracts in effect on the date of determination and estimates of costs in light of prevailing
market conditions in effect as of the date of determination, in each case as determined in good faith by the Company, as increased by, as of the date of determination, the discounted future net revenue before any state or federal income taxes of:

 (A)    estimated proved crude oil and natural gas reserves of the Company and its Subsidiaries
attributable to acquisitions consummated since the date of such year-end reserve report, and 

(B)    estimated proved crude oil and natural gas reserves of the Company and its Subsidiaries
attributable to extensions, discoveries and other additions and upward determinations of estimates of proved crude oil and natural gas reserves (including previously estimated development costs incurred during the period and the accretion of
discount since the prior year-end) due to exploration, development or exploitation, production or other activities which reserves were not reflected in such year-end
reserve report (as adjusted for pricing and costs as set forth above), 

  
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 in the case of the determination made under each of clauses (A) and (B) above, calculated
in accordance with SEC guidelines (except utilizing commodities prices and costs as set forth above) before any state or federal income taxes, and as decreased by, as of the date of determination, the discounted future net revenue before any state
or federal income taxes attributable to: 
 (C)    estimated proved crude oil and natural gas reserves
of the Company and its Subsidiaries reflected in such year-end reserve report (as adjusted for pricing and costs as set forth above) produced or disposed of since the date of such year-end reserve report, and 
 (D)    reductions in the estimated
proved crude oil and natural gas reserves of the Company and its Subsidiaries reflected in such year-end reserve report (as adjusted for pricing and costs as set forth above) since the date of such year-end reserve report attributable to downward determinations of estimates of proved crude oil and natural gas reserves due to exploration, development or exploitation, production or other activities conducted or
otherwise occurring since the date of such year-end reserve report, in each case calculated in accordance with SEC guidelines (except utilizing the commodities prices and costs as set forth above) before any
state or federal income taxes; 
 provided, however, that, in the case of each of the determinations made pursuant to
clauses (A) through (D) above, such increases and decreases shall be as estimated in good faith by the Company; 

(ii)    the capitalized costs that are attributable to crude oil and natural gas properties of the Company
and its Subsidiaries to which no proved crude oil and natural gas reserves are attributed, based on the Company’s books and records as of a date no earlier than the date of the Company’s latest annual or quarterly financial statements;

 (iii)    the net working capital, excluding unrealized gains and losses related to unsettled
derivatives, on a date no earlier than the date of the Company’s latest annual or quarterly financial statements; and 

(iv)    the greater of (I) the net book value on a date no earlier than the date of the Company’s
latest annual or quarterly financial statements and (II) the appraised value, as estimated by independent appraisers within the immediately preceding 12 months, of other tangible assets of the Company and its Subsidiaries (provided that the
Company shall not be required to obtain such an appraisal of such assets if no such appraisal has been performed); 
 minus 

(b)    to the extent not otherwise taken into account in the immediately preceding clause (a), the sum of: 

(i)    minority interests; 

  
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 (ii)    any net gas or other balancing liabilities of the
Company and its Subsidiaries reflected in the Company’s latest audited consolidated financial statements; 

(iii)    the discounted future net revenue, calculated in accordance with SEC guidelines (except utilizing
the commodities prices and costs set forth above) before any state or federal income taxes, attributable to reserves that are required to be delivered to third parties to fully satisfy the obligations of the Company and its Subsidiaries with respect
to volumetric production payments on the schedules specified with respect thereto; and 
 (iv)    the
discounted future net revenue, calculated in accordance with SEC guidelines before any state or federal income taxes, attributable to reserves subject to dollar denominated production payments that, based on the estimates of production included in
determining the discounted future net revenue specified in the immediately preceding clause (a)(i) (except utilizing the commodities prices and costs set forth above), would be necessary to satisfy fully the obligations of the Company and its
Subsidiaries with respect to dollar denominated production payments on the schedules specified with respect thereto. 
 For
the avoidance of doubt, references in this definition to “oil and natural gas reserves” shall include any reserves attributable to natural gas liquids and other hydrocarbons. 

“net working capital” means: 

(a)    all current assets of the Company and its Subsidiaries, minus 

(b)    all current liabilities of the Company and its Subsidiaries, except current liabilities included in
Indebtedness; in each case determined in accordance with GAAP. 
 “NYMEX prices” means, as of any date of
determination, the forward month prices for the most comparable hydrocarbon commodity applicable to such future production month for a five year period (or such shorter period if forward month prices are not quoted for a reasonably comparable
hydrocarbon commodity for the full five year period), with such prices held constant thereafter based on the last quoted forward month price of such period, as such prices are (i) quoted on the New York Mercantile Exchange (or its successor) as
of a date within 30 days of the date of determination and (ii) adjusted for energy content, quality and basis differentials; provided that with respect to estimated future production for which prices are defined, within the meaning of SEC
guidelines, by contractual arrangements excluding escalations based upon future conditions, then such contract prices shall be applied to future production subject to such arrangements. 

“volumetric production payments” mean production payment obligations recorded as deferred revenue in
accordance with GAAP, together with all undertakings and obligations in connection therewith. 

  
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 (f) All references to “Revolving Credit Facility” in the Indenture
shall be replaced with “Senior Credit Facility,” which shall be defined as follows: 
 “Senior Credit
Facility” means the Credit Agreement dated June 27, 2016 among Southwestern Energy Company, JP Morgan Chase Bank, N.A., as administrative agent and the lenders party thereto, as such agreement has been or may be amended, restated,
refinanced, replaced or refunded from time to time. 
 (g) All references to Sections of the Indenture amended by this
Supplemental Indenture shall be to such sections as amended by this Supplemental Indenture. 
 3.    Trust Indenture
Act Controls. If any provision of this Supplemental Indenture limits, qualifies or conflicts with another provision of the Indenture or this Supplemental Indenture which is required to be included in the Indenture or this Supplemental Indenture
by the Trust Indenture Act of 1939, as amended, as in effect on the date of the Indenture, except as provided in Section 8.3 thereof (in the case of the Indenture) or on the date of this Supplemental Indenture (in the case of this Supplemental
Indenture) (the “Trust Indenture Act”), the provision required by the Trust Indenture Act shall control. 

4.    No Recourse Against Others. An incorporator, director, officer, employee, stockholder or controlling person,
as such, of the Company shall not have any liability for any obligations of the Company under the 2022 Notes, the Indenture or this Supplemental Indenture or for any claim based on, in respect of or by reason of such obligations or their creation.
By accepting a Note, each Holder shall waive and release all such liability. 
 5.    Successors. All agreements
of the Company in this Supplemental Indenture shall bind its successors. 
 6.    Severability. In case any
provision in this Supplemental Indenture 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. 

7.    Governing Law. 

(a)    THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE
STATE OF NEW YORK. THE PARTIES HERETO AND THE HOLDERS OF THE 2022 NOTES BY THEIR ACCEPTANCE THEREOF EACH HEREBY WAIVE ANY RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE, OR
THE 2022 NOTES OR ANY TRANSACTION RELATED HERETO OR THERETO TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW. 

  
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 (b)    The Company hereby: 

(i)    agrees that any suit, action or proceeding against it arising out of or relating to this
Supplemental Indenture, the Indenture or the 2022 Notes, as the case may be, may be instituted in any federal or state court sitting in The City of New York; 

(ii)    waives to the fullest extent permitted by applicable law, any objection which it may now or
hereafter have to the laying of venue of any such suit, action or proceeding, and any claim that any suit, action or proceeding in such a court has been brought in an inconvenient forum; 

(iii)    irrevocably submits to the non-exclusive jurisdiction of
such courts in any suit, action or proceeding; 
 (iv)    agrees that final judgment in any such suit,
action or proceeding brought in such a court shall be conclusive and binding may be enforced in the courts of the jurisdiction of which it is subject by a suit upon judgment; and 

(v)    agrees that service of process by mail to the addresses specified herein shall constitute personal
service of such process on it in any such suit, action or proceeding. 
 8.    Notices. Any notice or
communication shall be in writing and delivered in person or mailed by first-class mail, postage prepaid, addressed as follows: 

(a)    if to the Company: to the address for the Company specified in or pursuant to the Indenture; and 

(b)    if to the Trustee: to the address for the Trustee specified in or pursuant to the Indenture. 

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

9.    Counterparts. The parties may sign any number of copies of this Supplemental Indenture. One signed copy is
enough to prove this Supplemental Indenture. This Supplemental Indenture may be executed in any number of counterparts, each of which so executed shall be an original, but all of them together represent the same agreement. The exchange of copies of
this Supplemental Indenture and of signature pages by facsimile or electronic (i.e., “pdf” or “tif”) transmission shall constitute effective execution and delivery of this Supplemental 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 electronic (i.e., “pdf” or “tif”) transmission shall be deemed to be their original
signatures for all purposes. 
 10.    Headings. The headings of the Sections of this Supplemental Indenture have
been inserted for convenience of reference only, are not intended to be considered a part hereof and shall not modify or restrict any of the terms or provisions hereof. 

  
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 11.    Trustee. The Trustee shall not be responsible and makes no
representation as to the validity, sufficiency or adequacy of this Supplemental Indenture, and it shall not be responsible for the recitals or statements in this Supplemental Indenture or in any document issued in connection with the 2022 Notes, the
Indenture or this Supplemental Indenture, all of which are made solely by the Company other than the Trustee’s certificate of authentication, and the Trustee assumes no responsibility for their correctness. 

12.    PATRIOT ACT. The parties hereto acknowledge that, in accordance with Section 326 of the USA Patriot
Act, the Trustee (like all financial institutions) is required to obtain, verify and record information that identifies each Person or legal entity that opens an account. The parties hereto agree that they will provide the Trustee with such
information as it may reasonably request in order for the Trustee to satisfy the requirements of the USA Patriot Act. 

13.    EFFECTIVENESS. This Supplemental Indenture shall become effective upon the execution and delivery thereof by
the Company and the Trustee; provided, however, that the amendments provided for in Section 2 hereof shall not become operative unless and until the Company pays the Consent Payment. The Company shall furnish the Trustee with a written notice
that sets forth the date when such amendments shall have become operative. Unless and until the Trustee receives such written notice, the Trustee can presume that the amendments have not become operative. 

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. 

  
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	Seal:	 		 	SOUTHWESTERN ENERGY COMPANY
				
	Attest:	 		 	By:	 	 /s/ Jennifer E. Stewart

		 		 	Name:	 	Jennifer E. Stewart
		 		 	Title:	 	Senior Vice President and
		 		 		 	Chief Financial Officer – Interim

 [Signature Page to First Supplemental Indenture] 

 
			
	 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

as Trustee

		
	By:	 	 /s/ Karen Yu

	Name:	 	Karen Yu
	Title:	 	Vice President

 [Signature Page to First Supplemental Indenture]EX-4.2

 Exhibit 4.2 

EXECUTION VERSION 
 THIRD
SUPPLEMENTAL INDENTURE 
 This Third Supplemental Indenture, dated as of November 29, 2017 (this “Supplemental
Indenture”), between Southwestern Energy Company, a Delaware corporation (the “Company”), and U.S. Bank National Association, as Trustee (the “Trustee”) under the Indenture referred to below. 

WITNESSETH 
 WHEREAS, the Company
and the Trustee have heretofore executed and delivered an Indenture (the “Base Indenture”), dated as of January 23, 2015, as previously supplemented by the First Supplemental Indenture (the “First Supplement”),
dated January 23, 2015 and the Second Supplemental Indenture (the “Second Supplement”), dated September 25, 2017 (the Base Indenture as modified by the First Supplement and the Second Supplement, the
“Indenture”), providing for the issuance by the Company of the following series of notes: (i) the 3.300% Senior Notes due 2018; (ii) the 4.050% Senior Notes due 2020 and (iii) the 4.950% Senior Notes due 2025 (the
“2025 Notes”) (collectively, the “Notes”); 
 WHEREAS, pursuant to Section 10.02 of the Base
Indenture, the Company and the Trustee are authorized to execute and deliver this Supplemental Indenture with the consent of the holders of at least a majority of the outstanding principal amount of the series of Notes affected by such amendment;

 WHEREAS, the Company has solicited consents from the holders of the 2025 Notes (the “Consent Solicitation”) pursuant to
a Consent Solicitation Statement, dated November 21, 2017 (the “Consent Solicitation Statement”), to certain proposed amendments (the “Proposed Amendments”) to the Indenture with respect to the 2025 Notes as
described in the Consent Solicitation Statement and set forth in Section 2 of this Supplemental Indenture, with the operation of such Proposed Amendments with respect to the 2025 Notes being subject to the satisfaction or waiver, where
permissible, by the Company of the conditions to the Consent Solicitation Statement, and the payment of the consent payment payable pursuant to the Consent Solicitation Statement (the “Consent Payment”); 

WHEREAS, the Company has received and caused to be delivered to the Trustee evidence of the consents from holders of a majority in outstanding
principal amount of the 2025 Notes (excluding any 2025 Notes owned by the Company or by any person directly or indirectly controlling or controlled by or under direct or indirect common control with the Company); 

WHEREAS, the Company is undertaking to execute and deliver this Supplemental Indenture to amend certain provisions and covenants in the
Indenture with respect to the 2025 Notes in connection with the Consent Solicitation; 
 WHEREAS, all acts and requirements necessary to
make this Supplemental Indenture a legal, valid and binding obligation of the Company have been done; and 
 WHEREAS, the terms hereof will
become operative upon the payment by the Company of the Consent Payment in respect of the 2025 Notes. 

 NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration,
the receipt of which is hereby acknowledged, the Company and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the 2025 Notes as follows: 

1.    Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them
in the Indenture. 
 2.    Certain Amendments to the Indenture and the 2025 Notes. The following amendments to
the First Supplement shall apply only with respect to the 2025 Notes and not to the other series of Securities established by the First Supplement. 

(a) Section 5.01. Limitation on Liens of the First Supplement shall be deleted in its entirety and replaced with the following:

 Section 5.01. Limitation on Liens. The Company will not, and will not permit any of its
Subsidiaries to, incur, assume or guarantee any indebtedness for borrowed money secured by a lien on (a) Productive Property, (b) any Principal Transmission Facility or (c) any shares of stock of any Subsidiary (collectively, (a), (b)
and (c), “Principal Property”), if the sum, without duplication, of: 
 (a)    the aggregate principal
amount of all Secured Debt of the Company and its Subsidiaries (other than Secured Debt secured by a Permitted Lien); and 

(b)    all Attributable Debt of the Company or its Subsidiaries in respect of Sale and Leaseback Transactions involving
any Principal Property (other than Permitted Sale and Leaseback Transactions), 
 exceeds the greater of $2.0 billion or 25% of the Company’s
ACNTA at the time of incurrence, unless the Company provides that the 2025 Notes will be secured equally and ratably with (or, at the Company’s option, prior to) such Secured Debt. 

(b) Section 5.02. Restriction of Sale-Leaseback Transactions of the First Supplement shall be deleted in its
entirety and replaced with the following: 
 Section 5.02. Restriction of Sale-Leaseback
Transactions. Neither the Company nor any of its Subsidiaries shall enter into, assume, guarantee or otherwise become liable with respect to any Sale and Leaseback Transaction involving any Principal Property, unless after giving effect
thereto the sum of all Attributable Debt in respect of such Sale and Leaseback Transactions (other than Permitted Sale and Leaseback Transactions) does not exceed $250.0 million. 

(c) Section 5.03. Future Subsidiary Guarantors of the First Supplement shall be deleted in its entirety and
replaced with the following: 
 Section 5.03. Future Subsidiary Guarantors. As of the date of this
Supplemental Indenture, the 2025 Notes shall not be guaranteed by any of the Company’s existing Subsidiaries. If, after the date of this Supplemental Indenture, any of the Company’s Subsidiaries

  
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guarantees, becomes a borrower or guarantor under, or grants any Lien to secure any obligations pursuant to (i) the Senior Credit Facility or any future Credit Facility or (ii) any
other indebtedness for money borrowed in excess of $500.0 million, then the Company shall cause such Subsidiary to become a Security Guarantor by executing a supplement to the Indenture and delivering such supplement to the Trustee promptly
(but in any event, within ten Business Days of the date on which it guaranteed or incurred such obligations or granted such Lien, as the case may be) in accordance with Article X of the Base Indenture. 

(d) The definition of Consolidated Assets in the Indenture shall be deleted in its entirety. 

(e) The following definitions shall be added to the First Supplement in the applicable alphabetical order: 

“ACNTA” means (without duplication), as of the date of determination: 

(a)    the sum of: 

(i)    discounted future net revenue from proved crude oil and natural gas reserves of the Company and its
Subsidiaries calculated in accordance with SEC guidelines before any state or federal income taxes, as estimated in a reserve report prepared as of the end of the Company’s most recently completed fiscal year, which reserve report is prepared
or audited by independent petroleum engineers as to at least 80% of the value of the reserves covered thereby, provided, however, that in lieu of using commodities prices and costs determined under SEC guidelines in such reserve report and for all
purposes of this definition, such discounted future net revenue shall be adjusted using NYMEX prices after giving further effect to commodity derivatives contracts in effect on the date of determination and estimates of costs in light of prevailing
market conditions in effect as of the date of determination, in each case as determined in good faith by the Company, as increased by, as of the date of determination, the discounted future net revenue before any state or federal income taxes of:

 (A)    estimated proved crude oil and natural gas reserves of the Company and its Subsidiaries
attributable to acquisitions consummated since the date of such year-end reserve report, and 

(B)    estimated proved crude oil and natural gas reserves of the Company and its Subsidiaries
attributable to extensions, discoveries and other additions and upward determinations of estimates of proved crude oil and natural gas reserves (including previously estimated development costs incurred during the period and the accretion of
discount since the prior year-end) due to exploration, development or exploitation, production or other activities which reserves were not reflected in such year-end
reserve report (as adjusted for pricing and costs as set forth above), 
 in the case of the determination made under each of clauses
(A) and (B) above, calculated in accordance with SEC guidelines (except utilizing commodities 

  
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prices and costs as set forth above) before any state or federal income taxes, and as decreased by, as of the date of determination, the discounted future net revenue before any state or federal
income taxes attributable to: 
 (C)    estimated proved crude oil and natural gas reserves of the
Company and its Subsidiaries reflected in such year-end reserve report (as adjusted for pricing and costs as set forth above) produced or disposed of since the date of such
year-end reserve report, and 
 (D)    reductions in the
estimated proved crude oil and natural gas reserves of the Company and its Subsidiaries reflected in such year-end reserve report (as adjusted for pricing and costs as set forth above) since the date of such year-end reserve report attributable to downward determinations of estimates of proved crude oil and natural gas reserves due to exploration, development or exploitation, production or other activities conducted or
otherwise occurring since the date of such year-end reserve report, in each case calculated in accordance with SEC guidelines (except utilizing the commodities prices and costs as set forth above) before any
state or federal income taxes; 
 provided, however, that, in the case of each of the determinations made pursuant to
clauses (A) through (D) above, such increases and decreases shall be as estimated in good faith by the Company; 

(ii)    the capitalized costs that are attributable to crude oil and natural gas properties of the Company
and its Subsidiaries to which no proved crude oil and natural gas reserves are attributed, based on the Company’s books and records as of a date no earlier than the date of the Company’s latest annual or quarterly financial statements;

 (iii)    the net working capital, excluding unrealized gains and losses related to unsettled
derivatives, on a date no earlier than the date of the Company’s latest annual or quarterly financial statements; and 

(iv)    the greater of (I) the net book value on a date no earlier than the date of the Company’s
latest annual or quarterly financial statements and (II) the appraised value, as estimated by independent appraisers within the immediately preceding 12 months, of other tangible assets of the Company and its Subsidiaries (provided that the
Company shall not be required to obtain such an appraisal of such assets if no such appraisal has been performed); 
 minus 

(b)    to the extent not otherwise taken into account in the immediately preceding clause (a), the sum of: 

(i)    minority interests; 

  
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 (ii)    any net gas or other balancing liabilities of the
Company and its Subsidiaries reflected in the Company’s latest audited consolidated financial statements; 

(iii)    the discounted future net revenue, calculated in accordance with SEC guidelines (except utilizing
the commodities prices and costs set forth above) before any state or federal income taxes, attributable to reserves that are required to be delivered to third parties to fully satisfy the obligations of the Company and its Subsidiaries with respect
to volumetric production payments on the schedules specified with respect thereto; and 
 (iv)    the
discounted future net revenue, calculated in accordance with SEC guidelines before any state or federal income taxes, attributable to reserves subject to dollar denominated production payments that, based on the estimates of production included in
determining the discounted future net revenue specified in the immediately preceding clause (a)(i) (except utilizing the commodities prices and costs set forth above), would be necessary to satisfy fully the obligations of the Company and its
Subsidiaries with respect to dollar denominated production payments on the schedules specified with respect thereto. 
 For
the avoidance of doubt, references in this definition to “oil and natural gas reserves” shall include any reserves attributable to natural gas liquids and other hydrocarbons. 

“net working capital” means: 

(a)    all current assets of the Company and its Subsidiaries, minus 

(b)    all current liabilities of the Company and its Subsidiaries, except current liabilities included in
Indebtedness; in each case determined in accordance with GAAP. 
 “NYMEX prices” means, as of any date of
determination, the forward month prices for the most comparable hydrocarbon commodity applicable to such future production month for a five year period (or such shorter period if forward month prices are not quoted for a reasonably comparable
hydrocarbon commodity for the full five year period), with such prices held constant thereafter based on the last quoted forward month price of such period, as such prices are (i) quoted on the New York Mercantile Exchange (or its successor) as
of a date within 30 days of the date of determination and (ii) adjusted for energy content, quality and basis differentials; provided that with respect to estimated future production for which prices are defined, within the meaning of SEC
guidelines, by contractual arrangements excluding escalations based upon future conditions, then such contract prices shall be applied to future production subject to such arrangements. 

“volumetric production payments” mean production payment obligations recorded as deferred revenue in
accordance with GAAP, together with all undertakings and obligations in connection therewith. 

  
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 (f) All references to Sections of the First Supplement amended by this
Supplemental Indenture shall be to such sections as amended by this Supplemental Indenture. 
 3.    Trust Indenture
Act Controls. If any provision of this Supplemental Indenture limits, qualifies or conflicts with another provision of the Indenture or this Supplemental Indenture which is required to be included in the Indenture or this Supplemental Indenture
by the Trust Indenture Act of 1939, as amended, as in effect on the date of the Indenture, except as provided in Section 8.3 thereof (in the case of the Indenture) or on the date of this Supplemental Indenture (in the case of this Supplemental
Indenture) (the “Trust Indenture Act”), the provision required by the Trust Indenture Act shall control. 

4.    No Recourse Against Others. An incorporator, director, officer, employee, stockholder or controlling person,
as such, of the Company shall not have any liability for any obligations of the Company under the 2025 Notes, the Indenture or this Supplemental Indenture or for any claim based on, in respect of or by reason of such obligations or their creation.
By accepting a Note, each Holder shall waive and release all such liability. 
 5.    Successors. All agreements
of the Company in this Supplemental Indenture shall bind its successors. All agreements of the Trustee in this Supplemental Indenture shall bind its successors. 

6.    Severability. In case any provision in this Supplemental Indenture 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. 

7.    Governing Law. 

(a)    THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE
STATE OF NEW YORK. THE PARTIES HERETO AND THE HOLDERS OF THE 2025 NOTES BY THEIR ACCEPTANCE THEREOF EACH HEREBY WAIVE ANY RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE, OR
THE 2025 NOTES OR ANY TRANSACTION RELATED HERETO OR THERETO TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW. 

(b)    The Company hereby: 

(i)    agrees that any suit, action or proceeding against it arising out of or relating to this
Supplemental Indenture, the Indenture or the 2025 Notes, as the case may be, may be instituted in any federal or state court sitting in The City of New York; 

(ii)    waives to the fullest extent permitted by applicable law, any objection which it may now or
hereafter have to the laying of venue of any such suit, action or proceeding, and any claim that any suit, action or proceeding in such a court has been brought in an inconvenient forum; 

  
 6 

 (iii)    irrevocably submits to the non-exclusive jurisdiction of such courts in any suit, action or proceeding; 

(iv)    agrees that final judgment in any such suit, action or proceeding brought in such a court shall be
conclusive and binding may be enforced in the courts of the jurisdiction of which it is subject by a suit upon judgment; and 

(v)    agrees that service of process by mail to the addresses specified herein shall constitute personal
service of such process on it in any such suit, action or proceeding. 
 8.    Notices. Any notice or
communication shall be in writing and delivered in person or mailed by first-class mail, postage prepaid, addressed as follows: 

(a)    if to the Company: to the address for the Company specified in or pursuant to the Indenture; and 

(b)    if to the Trustee: to the address for the Trustee specified in or pursuant to the Indenture. 

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

9.    Counterparts. The parties may sign any number of copies of this Supplemental Indenture. One signed copy is
enough to prove this Supplemental Indenture. This Supplemental Indenture may be executed in any number of counterparts, each of which so executed shall be an original, but all of them together represent the same agreement. 

10.    Headings. The headings of the Sections of this Supplemental Indenture have been inserted for convenience of
reference only, are not intended to be considered a part hereof and shall not modify or restrict any of the terms or provisions hereof. 

11.    Trustee. The Trustee shall not be responsible and makes no representation as to the validity or adequacy of
this Supplemental Indenture, and it shall not be responsible for any statement of the Company in this Supplemental Indenture or in any document issued in connection with the 2025 Notes, the Indenture or this Supplemental Indenture other than the
Trustee’s certificate of authentication. 
 12.    PATRIOT ACT. The parties hereto acknowledge that, in
accordance with Section 326 of the USA Patriot Act, the Trustee (like all financial institutions) is required to obtain, verify and record information that identifies each Person or legal entity that opens an account. The parties hereto agree
that they will provide the Trustee with such information as it 
 may reasonably request in order for the Trustee to satisfy the requirements of the USA
Patriot Act. 

  
 7 

 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. 

  
 8 

							
	Seal:	 		 	SOUTHWESTERN ENERGY COMPANY
				
	Attest:	 		 	By:	 	 /s/ Jennifer E. Stewart

		 		 	Name:	 	Jennifer E. Stewart
		 		 	Title:	 	Senior Vice President and
		 		 		 	Chief Financial Officer – Interim

 [Signature Page to Third Supplemental Indenture] 

 
			
	 U.S. BANK NATIONAL ASSOCIATION
 as
Trustee

		
	By:	 	 /s/ Paula Oswald

	Name:	 	Paula Oswald
	Title:	 	Vice President

 [Signature Page to Third Supplemental Indenture]

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