Document:

Second Supplement Indentures dated 10/1/05 (7 1/2% Senior Notes)

 EXHIBIT 4.3 
 SECOND SUPPLEMENTAL INDENTURE 
 SECOND SUPPLEMENTAL INDENTURE dated as of October 1, 2005 between XTO
ENERGY INC., a Delaware corporation (hereinafter called the “Company”), and The Bank of New York Trust Company, N.A., a national banking association organized under the laws of the United States of America, trustee (hereinafter called the
“Successor Trustee”). 
 RECITALS OF THE COMPANY 
 The Company and The Bank of New York, a New York banking corporation (hereinafter called the “Prior Trustee”), entered into that certain Indenture dated as of April 23, 2002 (as amended by First
Supplemental Indenture dated as of April 23, 2002, the “Indenture”) for the equal and ratable benefit of the Holders of the Company’s 7 1/2% Senior Notes due 2012 (the “Notes”). 
 The Indenture identifies Prior Trustee as Trustee. However, on September 12, 2005, the Company, Prior Trustee, and Successor Trustee entered into an
agreement by which Successor Trustee succeeded Prior Trustee in Prior Trustee’s capacities as Trustee, Paying Agent and Registrar effective October 1, 2005. Terms not defined herein shall have the meaning ascribed thereto in the Indenture.

 Section 8.1 of the Indenture provides that the Company and the Trustee, without the consent of any Holders, may enter into one or
more indentures supplemental to the Indenture to evidence and provide for the acceptance of appointment hereunder by a successor Trustee pursuant to the requirements of Sections 5.9 and 5.10. 
 The Company and the Successor Trustee desire to update the Indenture, in accordance with and pursuant to Section 8.1 of the Indenture, to reflect
that the Successor Trustee and not the Prior Trustee is serving in the capacity as Trustee under the Indenture. 
 NOW THEREFORE, THIS
SUPPLEMENTAL INDENTURE WITNESSETH: 
 For and in consideration of the premises, it is mutually covenanted and agreed as follows: 

1. Successor Trustee. In the introductory paragraph of the Indenture, the designation of “Trustee” is updated to reflect that the
Successor Trustee and not the Prior Trustee is the Trustee, so that, as so updated and changed, said introductory paragraph shall read in its entirety as follows: 
 INDENTURE, dated as of April 23, 2002 between XTO Energy Inc., a Delaware corporation (hereinafter called the “Company”),
and The Bank of New York Trust Company, N.A., an entity incorporated under the laws of the United States, as trustee (hereinafter called the “Trustee”). 
 2. References. Throughout the Indenture, references to the Trustee shall be deemed to refer to the Successor Trustee. 
  

 1 

 3. Effect of Amendments. Except as expressly set forth herein, the amendments contained herein
shall not constitute an amendment or waiver of any provision of the Indenture, and all of such provisions shall remain in full force and effect and are hereby ratified and confirmed in all respects. 
 (Remainder of Page Intentionally Left Blank) 
  

 2 

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

					
	 XTO ENERGY INC.,
 a Delaware corporation

		
	 By: 
	 	 /S/ BRENT W. CLUM

		 	 Name: 
	 	 Brent W. Clum

		 	 Title: 
	 	 Vice President and Treasurer

	
	 TRUSTEE:

	
	 THE BANK OF NEW YORK TRUST
 COMPANY, N.A., as Trustee

		
	 By: 
	 	 /S/ JOHN C. STOHLMANN

		 	 Name: 
	 	 John C. Stohlmann

		 	 Title: 
	 	 Vice President

  

 3First Supplement Indentures dated 10/1/05 (6 1/4% Senior Notes)

 EXHIBIT 4.4 
 FIRST SUPPLEMENTAL INDENTURE 
 FIRST SUPPLEMENTAL INDENTURE dated as of October 1, 2005 between XTO
ENERGY INC., a Delaware corporation (hereinafter called the “Company”), and The Bank of New York Trust Company, N.A., a national banking association organized under the laws of the United States of America, trustee (hereinafter called the
“Successor Trustee”). 
 RECITALS OF THE COMPANY 
 The Company and The Bank of New York, a New York banking corporation (hereinafter called the “Prior Trustee”), entered into that certain Indenture dated as of April 23, 2003 (the “Indenture”)
for the equal and ratable benefit of the Holders of the Company’s 6 1/4% Senior Notes due 2013 (the “Notes”). 
 The Indenture
identifies Prior Trustee as Trustee. However, on September 12, 2005, the Company, Prior Trustee, and Successor Trustee entered into an agreement by which Successor Trustee succeeded Prior Trustee in Prior Trustee’s capacities as Trustee,
Paying Agent and Registrar effective October 1, 2005. Terms not defined herein shall have the meaning ascribed thereto in the Indenture. 
 Section 8.1 of the Indenture provides that the Company and the Trustee, without the consent of any Holders, may enter into one or more indentures supplemental to the Indenture to evidence and provide for the acceptance of appointment
hereunder by a successor Trustee pursuant to the requirements of Sections 5.9 and 5.10. 
 The Company and the Successor Trustee desire to
update the Indenture, in accordance with and pursuant to Section 8.1 of the Indenture, to reflect that the Successor Trustee and not the Prior Trustee is serving in the capacity as Trustee under the Indenture. 
 NOW THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH: 
 For and in consideration of the premises, it is mutually covenanted and agreed as follows: 
 1. Successor
Trustee. In the introductory paragraph of the Indenture, the designation of “Trustee” is updated to reflect that the Successor Trustee and not the Prior Trustee is the Trustee, so that, as so updated and changed, said introductory
paragraph shall read in its entirety as follows: 
 INDENTURE, dated as of April 23, 2003 between XTO Energy Inc., a
Delaware corporation (hereinafter called the “Company”), and The Bank of New York Trust Company, N.A., an entity incorporated under the laws of the United States, as trustee (hereinafter called the “Trustee”). 
 2. References. Throughout the Indenture, references to the Trustee shall be deemed to refer to the Successor Trustee. 
  

 1 

 3. Effect of Amendments. Except as expressly set forth herein, the amendments contained herein
shall not constitute an amendment or waiver of any provision of the Indenture, and all of such provisions shall remain in full force and effect and are hereby ratified and confirmed in all respects. 
 (Remainder of Page Intentionally Left Blank) 
  

 2 

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

					
	 XTO ENERGY INC.,
 a Delaware corporation

		
	 By: 
	 	 /S/ BRENT W. CLUM

		 	 Name: 
	 	 Brent W. Clum

		 	 Title: 
	 	 Vice President and Treasurer

	
	 TRUSTEE:

	
	 THE BANK OF NEW YORK TRUST
 COMPANY, N.A., as Trustee

		
	 By: 
	 	 /S/ JOHN C. STOHLMANN

		 	 Name: 
	 	 John C. Stohlmann

		 	 Title: 
	 	 Vice President

  

 3Second Supplement Indentures dated 10/1/05 (4.90% Senior Notes)

 EXHIBIT 4.5 
 SECOND SUPPLEMENTAL INDENTURE 
 SECOND SUPPLEMENTAL INDENTURE dated as of October 1, 2005 between XTO
ENERGY INC., a Delaware corporation (hereinafter called the “Company”), and The Bank of New York Trust Company, N.A., a national banking association organized under the laws of the United States of America, trustee (hereinafter called the
“Successor Trustee”). 
 RECITALS OF THE COMPANY 
 The Company and The Bank of New York, a New York banking corporation (hereinafter called the “Prior Trustee”), entered into that certain Indenture dated as of January 22, 2004 (as amended by First
Supplemental Indenture dated as of January 22, 2004, the “Indenture”) for the equal and ratable benefit of the Holders of the Company’s 4.90% Senior Notes due 2014 (the “Notes”). 
 The Indenture identifies Prior Trustee as Trustee. However, on September 12, 2005, the Company, Prior Trustee, and Successor Trustee entered into an
agreement by which Successor Trustee succeeded Prior Trustee in Prior Trustee’s capacities as Trustee, Paying Agent and Registrar effective October 1, 2005. Terms not defined herein shall have the meaning ascribed thereto in the Indenture.

 Section 8.1 of the Indenture provides that the Company and the Trustee, without the consent of any Holders, may enter into one or
more indentures supplemental to the Indenture to evidence and provide for the acceptance of appointment hereunder by a successor Trustee pursuant to the requirements of Sections 5.9 and 5.10. 
 The Company and the Successor Trustee desire to update the Indenture, in accordance with and pursuant to Section 8.1 of the Indenture, to reflect
that the Successor Trustee and not the Prior Trustee is serving in the capacity as Trustee under the Indenture. 
 NOW THEREFORE, THIS
SUPPLEMENTAL INDENTURE WITNESSETH: 
 For and in consideration of the premises, it is mutually covenanted and agreed as follows: 

1. Successor Trustee. In the introductory paragraph of the Indenture, the designation of “Trustee” is updated to reflect that the
Successor Trustee and not the Prior Trustee is the Trustee, so that, as so updated and changed, said introductory paragraph shall read in its entirety as follows: 
 INDENTURE, dated as of January 22, 2004 between XTO Energy Inc., a Delaware corporation (hereinafter called the “Company”),
and The Bank of New York Trust Company, N.A., an entity incorporated under the laws of the United States, as trustee (hereinafter called the “Trustee”). 
 2. References. Throughout the Indenture, references to the Trustee shall be deemed to refer to the Successor Trustee. 
  

 1 

 3. Effect of Amendments. Except as expressly set forth herein, the amendments contained herein
shall not constitute an amendment or waiver of any provision of the Indenture, and all of such provisions shall remain in full force and effect and are hereby ratified and confirmed in all respects. 
 (Remainder of Page Intentionally Left Blank) 
  

 2 

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

					
	 XTO ENERGY INC.,
 a Delaware corporation

		
	 By: 
	 	 /s/ Brent W. Clum

		 	 Name: 
	 	 Brent W. Clum

		 	 Title: 
	 	 Vice President and Treasurer

	
	 TRUSTEE:

	
	 THE BANK OF NEW YORK TRUST
 COMPANY, N.A., as Trustee

		
	 By: 
	 	 /s/ John C. Stohlmann

		 	 Name: 
	 	 John C. Stohlmann

		 	 Title: 
	 	 Vice President

  

 3

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