EX-4.2



 Exhibit 4.2 

FOURTH SUPPLEMENTAL INDENTURE (this “Fourth Supplemental Indenture”) dated as of June 14, 2018, among HISTORIC TW
INC., a Delaware corporation (the “Company”), TIME WARNER INC., a Delaware corporation (“TWX”), HISTORIC AOL LLC (formerly known as AOL LLC), a Delaware limited liability company (“AOL”), TURNER
BROADCASTING SYSTEM, INC., a Georgia corporation (“TBS”), HOME BOX OFFICE, INC., a Delaware corporation (“HBO”), WEST MERGER SUB II, LLC, a Delaware limited liability company (“Merger Sub LLC”), and
THE BANK OF NEW YORK MELLON (formerly known as The Bank of New York, as successor trustee to The Chase Manhattan Bank), a New York banking corporation, as trustee (the “Trustee”). 

W I T N E S S E T H 
 WHEREAS,
the Company (in its own capacity and as successor to Time Warner Companies, Inc. (“TWCI”)) and TBS have executed and delivered to the Trustee an Indenture (the “Original Indenture”), dated as of June 1, 1998,
as amended from time to time, by way of the First Supplemental Indenture, dated as of January 11, 2001, among the Company (in its own capacity and as successor to TWCI), TWX, AOL, TBS and the Trustee (the “First Supplemental
Indenture”), the Second Supplemental Indenture, dated as of April 16, 2009, among the Company (in its own capacity and as successor to TWCI), TWX, AOL, TBS and the Trustee, and the Third Supplemental Indenture, dated as of
December 3, 2009, among the Company (in its own capacity and as successor to TWCI), TWX, AOL, TBS, HBO and the Trustee (the “Third Supplemental Indenture”) (the Original Indenture, as so amended, is herein called the
“Indenture”), providing for the issuance and sale by the Company from time to time of its senior debt securities (the “Securities”, which term shall include any Securities issued under the Indenture after the date
hereof); 
 WHEREAS, TWCI had, by way of the Original Indenture, unconditionally and irrevocably guaranteed the obligations of the Company
under the Indenture (the “TWCI Guarantee”) and extended to the Holders of Securities certain rights and privileges in connection with the TWCI Guarantee; 

WHEREAS, pursuant to a certificate of ownership and merger filed with the Secretary of State of the State of Delaware, TWCI merged with and
into the Company on February 24, 2009, with the Company being the surviving corporation, and the Company, by operation of Sections 8.01 and 8.02 of the Indenture, assumed all the obligations of TWCI under the TWCI Guarantee; 

WHEREAS, TBS has, by way of the Original Indenture, unconditionally and irrevocably guaranteed the obligations of the Company under the
Indenture (the “TBS Guarantee”) and extended to the Holders of Securities certain rights and privileges in connection with the TBS Guarantee; 

WHEREAS, AOL has, by way of the First Supplemental Indenture, unconditionally and irrevocably guaranteed the obligations of the Company under
the Indenture (the “AOL Guarantee”) and extended to the Holders of Securities certain rights and privileges in connection with the AOL Guarantee; 
  







 WHEREAS, TWX has, by way of the First Supplemental Indenture, unconditionally and irrevocably
guaranteed the obligations of (a) the Company under the Indenture and (b) AOL under the AOL Guarantee (together, the “TWX Guarantee”) and extended to the Holders of Securities certain rights and privileges in connection
with the TWX Guarantee; 
 WHEREAS, HBO has, by way of the Third Supplemental Indenture, unconditionally and irrevocably guaranteed the full
and punctual payment of the principal of and interest on the Securities when due, whether at maturity, by acceleration, by redemption or otherwise, and of all other monetary obligations of the Company under the Indenture (including obligations to
the Trustee thereunder) and the Securities and of the full and punctual performance within applicable grace periods of all other obligations of the Company under the Indenture and the Securities; 

WHEREAS, pursuant to the Agreement and Plan of Merger dated as of October 22, 2016 (as it may be amended or otherwise modified from time
to time, the “Merger Agreement”), among TWX, AT&T Inc., a Delaware corporation (“AT&T”), West Merger Sub, Inc., a Delaware corporation (“Merger Sub Corp”), and Merger Sub LLC, Merger Sub
Corp will merge with and into TWX (the “Initial Merger”), and at the effective time of the Initial Merger (the “First Effective Time”) the separate corporate existence of Merger Sub Corp will cease and TWX will
continue as the surviving corporation in the Initial Merger and a wholly-owned subsidiary of AT&T; 
 WHEREAS, pursuant to the Merger
Agreement, immediately following the First Effective Time, TWX, as the surviving corporation in the Initial Merger, will merge with and into Merger Sub LLC (the “Subsequent Merger”), and at the effective time of the Subsequent
Merger (the “Second Effective Time”) the separate corporate existence of TWX will cease and Merger Sub LLC will continue as the surviving company in the Subsequent Merger and a wholly-owned subsidiary of AT&T; 

WHEREAS, Section 8.01(1)(b) of the Indenture provides that in the case of a merger of TWX into any other Person, the Person into which
TWX is merged shall expressly assume by supplemental indenture the performance of every covenant of the Indenture on the part of TWX to be performed or observed; 

WHEREAS, pursuant to Section 8.02 of the Indenture, upon completion of the Subsequent Merger and the execution and delivery of this
Fourth Supplemental Indenture, Merger Sub LLC shall succeed to, and be substituted for, and may exercise every right and power of, TWX under the Indenture with the same effect as if Merger Sub LLC had been named as TWX in the Indenture; 

WHEREAS, Section 9.01(1) of the Indenture permits the Company, when authorized by a Board Resolution, and the Trustee, at any time and
from time to time and without the consent of the Holders of any Securities, to enter into one or more indentures 

  
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supplemental to the Indenture, in form satisfactory to the Trustee, for the purpose of evidencing the succession of another corporation or Person to TWX, and the assumption by such successor of
the covenants of TWX contained in the Indenture and in the Securities; 
 WHEREAS, the Company is authorized by a Board Resolution to enter
into this Fourth Supplemental Indenture; and 
 WHEREAS, the Company has requested that the Trustee execute and deliver this Fourth
Supplemental Indenture, and all requirements necessary to make this Fourth Supplemental Indenture a valid instrument in accordance with its terms, to make the assumption of the obligations of TWX under the Indenture a valid act of Merger Sub LLC and
the execution and delivery of this Fourth Supplemental Indenture have been duly authorized in all respects. 
 NOW, THEREFORE, the Company
(in its own capacity and as successor to TWCI), TWX, AOL, TBS, HBO, Merger Sub LLC and the Trustee hereby agree that this Fourth Supplemental Indenture supplements the Indenture with respect to Securities issued thereunder: 

SECTION 1. Definitions. Unless otherwise provided herein, the capitalized terms used and not defined herein have the meanings ascribed
to such terms in the Indenture. 
 SECTION 2. Assumption by Merger Sub LLC. As of the Second Effective Time, Merger Sub LLC, as the
surviving company in the Subsequent Merger, hereby assumes the performance of every covenant of the Indenture (as supplemented from time to time) on the part of TWX to be performed or observed. As of the Second Effective Time, Merger Sub LLC hereby
succeeds to, is substituted for, and may exercise every right and power of, TWX under the Indenture with the same effect as if Merger Sub LLC had been named as TWX in the Indenture. 

SECTION 3. Effectiveness. In the event that the Second Effective Time does not occur on or prior to the Termination Date (as defined in
the Merger Agreement), this Fourth Supplemental Indenture shall not become operative and shall be null and void immediately following the Termination Date (as defined in the Merger Agreement). 

SECTION 4. This Fourth Supplemental Indenture. This Fourth Supplemental Indenture shall be construed as supplemental to the Indenture
and shall form a part of it, and the Indenture is hereby incorporated by reference herein and each is hereby ratified, approved and confirmed. 

SECTION 5. GOVERNING LAW. THIS FOURTH SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK. 

  
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 SECTION 6. Counterparts. This Fourth Supplemental Indenture may be executed in two or more
counterparts, each of which shall constitute an original, but all of which when taken together shall constitute but one instrument. 

SECTION 7. Headings. The headings of this Fourth Supplemental Indenture are for reference only and shall not limit or otherwise affect
the meaning hereof. 
 SECTION 8. Trustee Not Responsible for Recitals. The recitals herein contained are made by the Company, TWX,
AOL, TBS, HBO and Merger Sub LLC and not by the Trustee, and the Trustee assumes no responsibility for the correctness thereof. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this
Fourth Supplemental Indenture. 
 SECTION 9. Separability. In case any one or more of the provisions contained in this Fourth
Supplemental Indenture or in the Securities shall for any reason be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Fourth Supplemental
Indenture or of the Securities, but this Fourth Supplemental Indenture and the Securities shall be construed as if such invalid or illegal or unenforceable provision had never been contained herein or therein. 

[Remainder of Page Intentionally Left Blank] 
  

  
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 IN WITNESS WHEREOF, the parties hereto have caused this Fourth Supplemental Indenture to be duly
executed by their respective authorized officers as of the date first written above. 
  

			
	HISTORIC TW INC., 
		
	by	 	 /s/ Edward B. Ruggiero

	Name:	 	Edward B. Ruggiero
	Title:	 	Senior Vice President & Treasurer


  

			
	TIME WARNER INC., 
		
	by	 	 /s/ Edward B. Ruggiero

	Name:	 	Edward B. Ruggiero
	Title:	 	Senior Vice President & Treasurer


  

			
	HOME BOX OFFICE, INC., 
		
	by	 	 /s/ Edward B. Ruggiero

	Name:	 	Edward B. Ruggiero
	Title:	 	Senior Vice President & Assistant Treasurer


  

			
	HISTORIC AOL LLC, 
		
	by	 	Time Warner Inc.,
		 	as sole member of Historic AOL LLC
		
	by	 	 /s/ Edward B. Ruggiero

	Name:	 	Edward B. Ruggiero
	Title:	 	Senior Vice President & Treasurer


 [Signature Page to Fourth Supplemental Indenture] 







 
			
	TURNER BROADCASTING SYSTEM, INC.,
		
	by	 	 /s/ Edward B. Ruggiero

	Name:	 	Edward B. Ruggiero
	Title:	 	Senior Vice President & Assistant Treasurer


 [Signature Page to Fourth Supplemental Indenture] 







 
			
	WEST MERGER SUB II, LLC, 
		
	by	 	 /s/ Julianne K. Galloway

	Name:	 	Julianne K. Galloway
	Title:	 	Assistant Treasurer


 [Signature Page to Fourth Supplemental Indenture] 







 
			
	THE BANK OF NEW YORK MELLON, as Trustee,
		
	by	 	 /s/ Francine Kincaid

	Name:	 	Francine Kincaid
	Title:	 	Vice President


 [Signature Page to Fourth Supplemental Indenture]