Document:

EX-4.3

 Exhibit 4.3 

FIFTH SUPPLEMENTAL INDENTURE 

This FIFTH SUPPLEMENTAL INDENTURE, dated as of February 2, 2015, is among Williams Partners L.P., formerly known as Access Midstream
Partners, L.P., a Delaware limited partnership (the “Company”), ACMP Finance Corp., formerly known as CHKM Finance Corp., a Delaware corporation (“Finance Corp.” and, together with the Company, the
“Issuers”), and The Bank of New York Mellon Trust Company, N.A., a national banking association (the “Trustee”). Capitalized terms used herein but not defined herein shall have the meaning set forth in the Indenture
(as defined below). 
 RECITALS 

WHEREAS, the Issuers, the subsidiaries of the Company party thereto, as Guarantors (the “Former Guarantors”), and the Trustee
are parties to that certain Indenture, dated as of December 19, 2012 (the “Base Indenture”), as supplemented by the First Supplemental Indenture, dated as of December 19, 2012, the Second Supplemental Indenture, dated as
of January 7, 2013, the Third Supplemental Indenture and Amendment – Subsidiary Guarantee, dated as of April 18, 2014 (together with the Base Indenture, the “2023 Notes Indenture”) and the Third Supplemental
Indenture, dated as of March 7, 2014 (together with the Base Indenture, the “2024 Notes Indenture” and the 2024 Notes Indenture together with the 2023 Notes Indenture, the “Indenture”), pursuant to which the
Issuers have issued $1,400 million in principal amount of 4.875% Senior Notes due 2023 and $750.0 million in principal amount of 4.875% Senior Notes due 2024 (the “Notes”); 

WHEREAS, on the date hereof, the Company and Operating Company have terminated that certain Second Amended and Restated Credit Agreement,
dated as of May 13, 2013 (as amended, supplemented or otherwise modified prior to the date hereof, the “Existing Credit Agreement”) by and among the Company, Operating Company, the various agents and lenders party thereto and
Wells Fargo, National Association, as Administrative Agent; 
 WHEREAS, upon termination of the Existing Credit Agreement, each of the
Former Guarantors (other than the Operating Company) ceased to guarantee any Indebtedness of either of the Issuers or the Operating Company under a Credit Facility, and the Operating Company ceased to guarantee any Indebtedness of either of the
Issuers under a Credit Facility and ceased being an obligor with respect to any Indebtedness under a Credit Facility; 
 WHEREAS,
Section 11.04(5) of the Indenture provides that at such time as any Guarantor (other than the Operating Company) ceases to guarantee any other Indebtedness of either of the Issuers or the Operating Company under a Credit Facility, the
Subsidiary Guarantee of such Guarantor shall be released; 
 WHEREAS, Section 11.04(6) of the Indenture provides that at such time as
the Operating Company ceases to guarantee any other Indebtedness of either of the Issuers under a Credit Facility, the Subsidiary Guarantee of the Operating Company shall be released, provided that the Operating Company is then no longer an obligor
with respect to any Indebtedness under a Credit Facility; 

 Whereas, Section 11.04 of the Indenture provides that upon delivery by the Company to the
Trustee of an Officers’ Certificate to the effect that any of the conditions described in the Sections 11.04(1)-(6) of the Indenture has occurred, the Trustee shall execute any documents reasonably requested by the Company in order to
evidence the release of any Guarantor from its obligations under its Subsidiary Guarantee; 
 WHEREAS, on January 30, 2015, each of
S&P and Moody’s assigned an Investment Grade Rating to the Notes; 
 WHEREAS, Section 5.17 of the Indenture provides that at
such time as (a) the rating assigned to the Notes by either S&P or Moody’s is an Investment Grade Rating and (b) no Default has occurred and is continuing under this Indenture, upon delivery by the Company to the Trustee of an
Officers’ Certificate to the foregoing effect, the Company and its Restricted Subsidiaries will no longer be subject to the provisions of (i) Sections 4.10, 5.07, 5.08, 5.09, 5.10, 5.11, 5.16, and clause (d) of Section 6.01 of
the 2023 Notes Indenture and (ii) Sections 4.09, 5.07, 5.08, 5.09, 5.10, 5.11, 5.16, and clause (d) of Section 6.01 of the 2024 Notes Indenture (collectively, the “Terminated Restrictive Covenants”); 

WHEREAS, on the date hereof the Company has delivered an Officers’ Certificate to the Trustee under Sections 5.17 and 11.04 of the
Indenture with respect to the foregoing matters; 
 WHEREAS, Section 10.01(d) of the Indenture provides that the Issuers and the
Trustee may amend or supplement the Indenture to make any change that would not adversely affect the legal rights under the Indenture of any Holder, and Section 10.01(g) of the Indenture provides that the Issuers and the Trustee may amend or
supplement the Indenture to evidence the release of any Guarantor from its Subsidiary Guarantee in accordance with Article 11 of the Indenture; 

WHEREAS, the Issuers desire and have requested that the Trustee join with them in the execution and delivery of this Supplemental Indenture
for the purposes of evidencing (i) the release of the Former Guarantors from their respective Subsidiary Guarantees and (ii) the termination of the Terminated Restrictive Covenants; 

WHEREAS, the Issuers have each been duly authorized to enter into this Supplemental Indenture; 

WHEREAS, all conditions necessary to authorize the execution and delivery of this Supplemental Indenture and to make this Supplemental
Indenture a valid and binding instrument enforceable in accordance with its terms have been complied with or have been done or performed; and 

WHEREAS, pursuant to Section 10.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture. 

 NOW, THEREFORE, to comply with the provisions of the Indenture and in consideration of the above
premises, the parties mutually covenant and agree for the equal and proportionate benefit of the respective Holders of the Notes as follows: 

ARTICLE I. 
  

	Section 1.01	Relationship With Indenture. 

 The terms and provisions contained in the Indenture shall
constitute, and are hereby expressly made, a part of this Supplemental Indenture and the Issuers and the Trustee, by their execution and delivery of this Supplemental Indenture, expressly agree to such terms and provisions and to be bound thereby.
However, to the extent any provision of the Indenture conflicts with the express provisions of this Supplemental Indenture, the provisions of this Supplemental Indenture shall govern and be controlling. 

The Trustee accepts the amendment of the Indenture effected by this Supplemental Indenture and agrees to execute the trust created by the
Indenture as hereby amended, but only upon the terms and conditions set forth in the Indenture, including the terms and provisions defining and limiting the liabilities and responsibilities of the Trustee in the performance of the trust created by
the Indenture, and without limiting the generality of the foregoing, the Trustee shall not be responsible in any manner whatsoever for or with respect to any of the recitals or statements contained herein, all of which recitals or statements are
made solely by the Issuers, or for or with respect to (1) the validity or sufficiency of this Supplemental Indenture or any of the terms or provisions hereof, (2) the proper authorization hereof by the Issuers, (3) the due execution
hereof by the Issuers or (4) the consequences (direct or indirect and whether deliberate or inadvertent) of any amendment herein provided for, and the Trustee makes no representation with respect to any such matters. 

 

	Section 1.02	Effect of Headings. 

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

	Section 1.03	Successors and Assigns. 

 All covenants and agreements in this Supplemental Indenture by the
Issuers shall bind their respective successors and assigns, whether so expressed or not. 
  

	Section 1.04	Separability Clause. 

 In case any provision in this Supplemental Indenture or the Notes 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 1.05	Governing Law; Waiver of Trial by Jury. 

 This Supplemental Indenture shall be governed by and
construed in accordance with the laws of the State of New York. Each of the Issuers and the Trustee hereby irrevocably waives, 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 Supplemental Indenture. 

	Section 1.06	Counterparts. 

 This Supplemental Indenture may be executed in several counterparts, each of
which shall be an original and all of which shall constitute but one and the same instrument. 
 Article II. 

 

	Section 2.01	Acknowledgement of Release of Subsidiary Guarantees. 

 In accordance with Section 11.04 of
the Indenture, the Trustee hereby confirms that as of the date hereof, each of the Former Guarantors has been released from all of its obligations under is Subsidiary Guarantee. 

 

	Section 2.02	Elimination of Certain Covenants in the 2023 Notes Indenture. 

  

	 	(a)	Section 4.10 (Offer to Purchase by Application of Excess Proceeds) of the 2023 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally omitted]”.

  

	 	(b)	Section 5.07 (Limitation on Restricted Payments) of the 2023 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally omitted]”.

  

	 	(c)	Section 5.08 (Limitation on Dividend and Other Payment Restrictions Affecting Subsidiaries) of the 2023 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase
“[intentionally omitted]”. 

  

	 	(d)	Section 5.09 (Limitation on Incurrence of Indebtedness and Issuance of Preferred Stock) of the 2023 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase
“[intentionally omitted]”. 

  

	 	(e)	Section 5.10 (Limitation on Asset Sales) of the 2023 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally omitted]”. 

 

	 	(f)	Section 5.11 (Limitation on Transactions with Affiliates) of the 2023 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally omitted]”.

  

	 	(g)	Section 5.16 (Activities of Finance Corp) of the 2023 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally omitted]”. 

 

	 	(h)	Clause (d) of Section 6.01 (Merger, Consolidation or Sale of Assets) of the 2023 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally
omitted]”. 

  

	Section 2.03	Elimination of Certain Covenants in the 2024 Notes Indenture. 

  

	 	(a)	Section 4.09 (Offer to Purchase by Application of Excess Proceeds) of the 2024 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally omitted]”.

	 	(b)	Section 5.07 (Limitation on Restricted Payments) of the 2024 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally omitted]”.

  

	 	(c)	Section 5.08 (Limitation on Dividend and Other Payment Restrictions Affecting Subsidiaries) of the 2024 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase
“[intentionally omitted]”. 

  

	 	(d)	Section 5.09 (Limitation on Incurrence of Indebtedness and Issuance of Preferred Stock) of the 2024 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase
“[intentionally omitted]”. 

  

	 	(e)	Section 5.10 (Limitation on Asset Sales) of the 2024 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally omitted]”. 

 

	 	(f)	Section 5.11 (Limitation on Transactions with Affiliates) of the 2024 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally omitted]”.

  

	 	(g)	Section 5.16 (Activities of Finance Corp) of the 2024 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally omitted]”. 

 

	 	(h)	Clause (d) of Section 6.01 (Merger, Consolidation or Sale of Assets) of the 2024 Notes Indenture is amended by deleting it in its entirety and inserting in lieu thereof the phrase “[intentionally
omitted]”. 

  

	Section 2.04	Change in Company Notice Address 

 Section 12.02 of the Indenture is amended by deleting
the following text, 
 “Access Midstream Partners, L.P. 

900 NW 63rd Street 
 Oklahoma
City, Oklahoma 73118 
 Attention: Chief Financial Officer 

Telecopier No.: (405) 849-4615” 

and replacing it with: 

“Williams Partners L.P. 

One Williams Center 
 Tulsa,
Oklahoma 74172 
 Attention: Chief Financial Officer 

Telecopier No.: (302) 655-5049” 
  

	Section 2.05	References to Deleted Provisions. 

 All references in the Indenture and any Note to any of the
provisions deleted and eliminated as provided herein, or to terms defined and used solely in such provisions, shall also be deemed deleted and eliminated, as the case may be, in accordance with the terms of this Supplemental Indenture. Effective as
of the date hereof, none of the Issuers, the Trustee or other parties to or beneficiaries of the Indenture shall have any rights, obligations or liabilities under 

 
such Sections or subsections and such deleted Sections or subsections shall not be considered in determining whether an Event of Default has occurred or whether the Issuers have observed,
performed or complied with the provisions of the Indenture or any Note. 
 Signature page follows. 

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

					
	WILLIAMS PARTNERS L.P.
		
	By:	 	 WPZ GP LLC,
 its General
Partner

		
	By:	 	 /s/ Peter Burgess

		 	Name:	 	Peter Burgess
		 	Title:	 	Treasurer
	
	ACMP FINANCE CORP.
		
	By:	 	 /s/ Peter Burgess

		 	Name:	 	Peter Burgess
		 	Title:	 	Treasurer
	
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee
		
	By:	 	 /s/ Jonathan Glover

		 	Name:	 	Jonathan Glover
		 	Title:	 	Vice President

 FIFTH SUPPLEMENTAL INDENTUREEX-4.4

 Exhibit 4.4 

SEVENTH SUPPLEMENTAL INDENTURE 

This SEVENTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of February 2, 2015, is between WILLIAMS
PARTNERS L.P., a Delaware limited partnership, formerly known as Access Midstream Partners, L.P. (the “Company”), and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., a national banking association, duly organized and validly
existing under the laws of the United States of America, as trustee (the “Trustee”). 
 WHEREAS, Williams Partners L.P., a
Delaware limited partnership and predecessor by merger to the Company (the “Predecessor”), has heretofore executed and delivered to the Trustee an Indenture, dated as of November 9, 2010, (the “Base
Indenture”), as supplemented by the First Supplemental Indenture, dated as of November 9, 2010, the Second Supplemental Indenture, dated as of November 17, 2011, the Third Supplemental Indenture, dated as of August 14, 2012,
the Fourth Supplemental Indenture, dated as of November 15, 2013, the Fifth Supplemental Indenture, dated as of March 4, 2014 and the Sixth Supplemental Indenture, dated as of June 27, 2014 (the Base Indenture as so supplemented, the
“Indenture”), each between the Predecessor and the Trustee (the “Indenture”), pursuant to which the Predecessor’s 4.125% Senior Notes due 2020, 4.00% Senior Notes due 2021, 3.35% Senior Notes due 2022, 4.500%
Senior Notes due 2023, 5.800% Senior Notes due 2043, 4.300% Senior Notes due 2024, 5.400% Senior Notes due 2044, 3.90% Senior Notes due 2025 and 4.90% Senior Notes due 2045 (together, the “Securities”) have been issued; 

WHEREAS, on the date hereof, immediately prior to the effectiveness of this Supplemental Indenture, the Predecessor merged with and into the
Company, with the Company surviving and continuing its existence under the laws of the State of Delaware, and the merger became effective under the laws of the State of Delaware; 

WHEREAS, Section 801(2) of the Base Indenture provides, among other things, that the Predecessor shall not merge with or into any Person
unless the Person formed by or surviving any such merger expressly assumes, by an indenture supplemental thereto, in form reasonably satisfactory to the Trustee, the due and punctual payment of the principal of, any premium and interest on, and any
Additional Amounts with respect to, all the Securities and the performance of every obligation in the Indenture and the Outstanding Securities on the part of the Company; 

WHEREAS, Section 802 of the Base Indenture provides that, upon any merger in accordance with Section 801 of the Base Indenture, the
successor Person formed by such merger shall succeed to, and be substituted for, and may exercise every right and power of, the Predecessor under the Indenture with the same effect as if such successor Person had been named as the Predecessor in the
Indenture; and thereafter, except in the case of a lease, the Predecessor shall be released from all obligations and covenants under the Indenture and the Securities; 

WHEREAS, Section 901(1) of the Base Indenture provides that, without the consent of any Holders of Securities, the Company (when
authorized by or pursuant to a Board Resolution) and the Trustee, at any time and from time to time, may enter into one or more supplemental indentures with respect to the Securities, in form satisfactory to the Trustee, to evidence the succession
of the Company to the Predecessor, and the assumption by the Company of the covenants of the Predecessor contained in the Indenture and in the Securities; 

 WHEREAS, the Company desires and has requested that the Trustee join with it in the execution and
delivery of this Supplemental Indenture for the purpose of evidencing such succession and assumption; 
 WHEREAS, the Company has been duly
authorized to enter into this Supplemental Indenture; 
 WHEREAS, all conditions necessary to authorize the execution and delivery of this
Supplemental Indenture and to make this Supplemental Indenture a valid and binding instrument enforceable in accordance with its terms have been complied with or have been done or performed; and 

WHEREAS, pursuant to Section 901 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 parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Securities as follows: 

ARTICLE ONE 
  

	Section 101	Defined Terms. 

 Except as otherwise expressly provided in or pursuant to this Supplemental
Indenture or unless the context otherwise requires, for all purposes of this Supplemental Indenture the terms used herein without definition shall have the meanings assigned to them in the Indenture. 

 

	Section 102	Relationship With Indenture. 

 The terms and provisions contained in the Indenture shall
constitute, and are hereby expressly made, a part of this Supplemental Indenture and the Company and the Trustee, by their execution and delivery of this Supplemental Indenture, expressly agree to such terms and provisions and to be bound thereby.
However, to the extent any provision of the Indenture conflicts with the express provisions of this Supplemental Indenture, the provisions of this Supplemental Indenture shall govern and be controlling. 

The Trustee accepts the amendment of the Indenture effected by this Supplemental Indenture and agrees to execute the trust created by the
Indenture as hereby amended, but only upon the terms and conditions set forth in the Indenture, including the terms and provisions defining and limiting the liabilities and responsibilities of the Trustee in the performance of the trust created by
the Indenture, and without limiting the generality of the foregoing, the Trustee shall not be responsible in any manner whatsoever for or with respect to any of the recitals or statements contained herein, all of which recitals or statements are
made solely by the Company, or for or with respect to (1) the validity or sufficiency of this Supplemental Indenture or any of the terms or provisions hereof, (2) the proper authorization hereof by the Company, (3) the due

 
execution hereof by the Company or (4) the consequences (direct or indirect and whether deliberate or inadvertent) of any amendment herein provided for, and the Trustee makes no
representation with respect to any such matters. 
  

	Section 103	Effect of Headings. 

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

	Section 104	Successors and Assigns. 

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

	Section 105	Separability Clause. 

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

	Section 106	Governing Law; Waiver of Trial by Jury. 

 This Supplemental Indenture shall be governed by and
construed in accordance with the laws of the State of New York applicable to agreements made or instruments entered into and, in each case, performed in said state. Each of the Company and the Trustee hereby irrevocably waives, 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 Supplemental Indenture, the Securities or the transactions contemplated hereby. 

 

	Section 107	Counterparts. 

 This Supplemental Indenture may be executed in several counterparts, each of
which shall be an original and all of which shall constitute but one and the same instrument. 
 ARTICLE TWO 

 

	Section 201	Assumptions and Agreements of Successor 

 (a) In accordance with Section 801 of the Base
Indenture, the Company hereby expressly assumes the due and punctual payment of the principal of, and any premium and interest on, and any Additional Amounts with respect to, all the Securities and the performance of every obligation of the
Predecessor in the Indenture and the Outstanding Securities on the part of the Company to be performed or observed. 
 (b) In accordance
with Section 802 of the Base Indenture, the Company shall succeed to, and be substituted for, and may exercise every right and power of, the Predecessor under the Indenture with the same effect as if such successor Person had been named as the
Predecessor in the Indenture. 

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

					
	WILLIAMS PARTNERS L.P.
		
	By:	 	 WPZ GP LLC,
 its General
Partner

		
	By:	 	 /s/ Peter S. Burgess

		 	Name:	 	Peter S. Burgess
		 	Title:	 	Treasurer
	
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee
		
	By:	 	 /s/ Jonathan Glover

		 	Name:	 	Jonathan Glover
		 	Title:	 	Vice President

 SEVENTH SUPPLEMENTAL INDENTURE

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