Document:

First Supplement Indentures dated 10/1/05 (5% Senior Notes)

 EXHIBIT 4.6 
 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, 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 September 23, 2004 (the
“Indenture”) for the equal and ratable benefit of the Holders of the Company’s 5.00% Senior Notes due 2015 (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 September 23, 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. 
  

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 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) 
  

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 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

  

 3First Amend. to Five-Year Revolving Credit Agreement dated 3/1/06

 EXHIBIT 10.1 
  

 FIRST AMENDMENT TO 
 5-YEAR REVOLVING CREDIT AGREEMENT 
 dated as of 
 March 10, 2006 
 among

 XTO ENERGY INC., 
 as Borrower, 
 JPMORGAN CHASE BANK, N.A., 
 as Administrative Agent, 
 and 
 The Lenders Party Hereto 
  

 BANK OF AMERICA, N.A., 
 BNP
PARIBAS, 
 CALYON NEW YORK BRANCH, 
 and 
 WACHOVIA BANK, NATIONAL ASSOCIATION, 
 as Co-Syndication Agents 
 and

 CITIBANK, N.A., 
 HARRIS NESBITT FINANCING, INC., 
 and 
 SUNTRUST BANK, 
 as Co-Documentation Agents 
  

 J.P. MORGAN SECURITIES INC. and
BANC OF AMERICA SECURITIES LLC, 
 as Co-Arrangers and Joint Bookrunners 
  

 FIRST AMENDMENT TO 5-YEAR REVOLVING CREDIT AGREEMENT 
 THIS FIRST AMENDMENT TO 5-YEAR REVOLVING CREDIT AGREEMENT (this “First Amendment”) dated as of March 10, 2006, is among
XTO ENERGY INC., a Delaware corporation, as the Borrower; JPMORGAN CHASE BANK, N.A., as Administrative Agent, JPMORGAN CHASE BANK, N.A.,
BANK OF AMERICA, N.A., and U.S. BANK NATIONAL ASSOCIATION, as Issuing Banks, and the Lenders party hereto. 
 R E C I T A L S 
 A. The
Borrower, the Administrative Agent and the Lenders are parties to that certain 5-Year Revolving Credit Agreement dated as of April 1, 2005 (the “Credit Agreement”), pursuant to which the Lenders have made certain loans to and
extensions of credit for the account of the Borrower. 
 B. The Borrower has requested and the Lenders have agreed to amend certain
provisions of the Credit Agreement. 
 C. NOW, THEREFORE, in consideration of the premises and the mutual covenants herein contained, for
good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 
 Section 1. Defined Terms. Each capitalized term used herein but not otherwise defined herein has the meaning given such term in the Credit Agreement. Unless otherwise indicated, all article and section references in this First
Amendment refer to articles and sections of the Credit Agreement. 
 Section 2. Amendments to Credit Agreement. 
 2.1 Amendments to Section 1.01. 
 (a) The definition of “Agreement” is hereby amended in its entirety to read as follows: 
 “Agreement” means this 5-Year Revolving Credit Agreement, as amended by the First Amendment, as the same may from time to time be amended, modified, restated, or replaced from time to time. 
 (b) The first paragraph of the definition of “Applicable Margin” is hereby amended to read as follows: 
 “Applicable Margin” means, for any day, with respect to any Eurodollar Loan, or with respect to the commitment fees
payable hereunder, as the case may be, the Applicable Margin per annum set forth below under the caption “Commitment Fee Rate” or “Eurodollar Spread”, as the case may be, based upon the rating by S&P and Moody’s,
respectively, applicable on such date to the Index Debt: 

					
	 Index Debt Ratings
	 	 Commitment Fee Rate
	 	 Eurodollar Spread

	         Category
 1 >A3/A-
	 	0.050%	 	0.25%
	         Category 2
 Baa1/BBB+
	 	0.070%	 	0.30%
	         Category 3
 Baa2/BBB
	 	0.090%	 	0.40%
	         Category 4
 Baa3/BBB-
	 	0.110%	 	0.55%
	         Category 5
 <Ba1/BB+
	 	0.125%	 	0.70%

 provided that for each day during which the Borrower’s utilization of
available commitments is greater than or equal to 50%, the then applicable Eurodollar Spread will be increased by 0.05% if the Borrower’s Index Debt Rating is in Category 1, 2 or 3 and will be increased by 0.10% if the Borrower’s Index
Debt Rating is in Category 4 or 5. 
 (c) The definition of “Indebtedness” is hereby amended to insert the word
“and” prior to clause (l) and to delete the phrase “, and (m) obligations in respect of “ship-or-pay” or “take-or-pay” contracts” in its entirety. 
 (d) The definition of “Maturity Date” is hereby amended in its entirety to read as follows: 
 “Maturity Date” means the later of (a) April 1, 2011 and (b) if maturity is extended pursuant to
Section 2.05, such extended maturity date as determined pursuant to Section 2.05 (it being understood and agreed that any such maturity shall not be deemed extended for any Lender that has not consented to such extension). 
 (e) The definitions of “Investments” and “Permitted Investments” are hereby deleted. 
 (f) The following definition is hereby added where alphabetically appropriate to read as follows: 
 “First Amendment” means the First Amendment to 5-Year Revolving Credit Agreement dated as of March 10, 2006 among
the Borrower and the Lenders party thereto. 
  

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 2.2 Amendment to Section 1.04. Section 1.04 is hereby deleted and the following inserted in
lieu thereof: 
 Section 1.04 Accounting Terms; GAAP. Except as otherwise expressly provided herein, all terms of
an accounting or financial nature shall be construed in accordance with GAAP, as in effect from time to time; provided that, if the Borrower notifies the Administrative Agent that the Borrower requests an amendment to any provision hereof to
eliminate the effect of any change occurring after the date hereof in GAAP (including but not limited to any Statement of Financial Accounting Standards) or in the application thereof on the operation of such provision (or if the Administrative
Agent notifies the Borrower that the Required Lenders request an amendment to any provision hereof for such purpose), regardless of whether any such notice is given before or after such change in GAAP or in the application thereof, then such
provision shall be interpreted on the basis of GAAP as in effect and applied immediately before such change shall have become effective until such notice shall have been withdrawn or such provision shall have been amended in accordance herewith.

 2.3 Amendment to Section 6.02. Section 6.02(f) is hereby amended by deleting the amount “10%” in the last line
thereof and inserting in lieu thereof “15%”. 
 2.4 Deletion of Section 6.05. Section 6.05 is hereby deleted and
the following is inserted in lieu thereof: 
 “Section 6.05 Reserved.” 
 Section 3. Conditions Precedent. This First Amendment shall not become effective until the date on which each of the following conditions is
satisfied (or waived in accordance with Section 9.02(b) of the Credit Agreement) (the “Effective Date”): 
 3.1 The
Administrative Agent and the Lenders shall have received all fees and other amounts due and payable, if any, in connection with this First Amendment on or prior to the Effective Date, including the payment to each Lender, that delivers an executed
counterpart of this First Amendment prior to 12:00 noon (Houston time) on the Effective Date, of an amendment fee equal to 0.02% of its Commitment. 
 3.2 The Administrative Agent shall have received from the Lenders and the Borrower, counterparts (in such number as may be requested by the Administrative Agent) of this First Amendment signed on behalf of such Persons. 
 3.3 The Administrative Agent shall have received a favorable written opinion or opinions (addressed to the Administrative Agent and the Lenders and dated
the Effective Date) of counsel for the Borrower, in form and substance reasonably acceptable to the Administrative Agent. The Borrower hereby requests its counsel to deliver such opinion. 
 3.4 The Administrative Agent shall have received such other documents as the Administrative Agent or special counsel to the Administrative Agent may
reasonably request. 
 3.5 No Default shall have occurred and be continuing, after giving effect to the terms of this First Amendment.

  

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 Section 4. Miscellaneous. 
 4.1 Confirmation. The provisions of the Credit Agreement, as amended by this First Amendment, shall remain in full force and effect following the
effectiveness of this First Amendment. 
 4.2 Ratification and Affirmation; Representations and Warranties. The Borrower hereby
(a) ratifies and affirms its obligations under, and acknowledges, renews and extends its continued liability under, each Loan Document to which it is a party and agrees that each Loan Document to which it is a party remains in full force and
effect, except as expressly amended hereby, notwithstanding the amendments contained herein and (b) represents and warrants to the Lenders that as of the date hereof, after giving effect to the terms of this First Amendment: (i) all of the
representations and warranties contained in each Loan Document to which it is a party are true and correct, except to the extent any such representations and warranties are expressly limited to an earlier date, in which case, such representations
and warranties shall continue to be true and correct as of such specified earlier date, (ii) no Default has occurred and is continuing and (iii) since December 31, 2005, there has been no event, development or circumstance that has
had or could reasonably be expected to have a Material Adverse Effect. 
 4.3 Loan Document. This First Amendment is a “Loan
Document” as defined and described in the Credit Agreement and all of the terms and provisions of the Credit Agreement relating to Loan Documents shall apply hereto. 
 4.4 Counterparts. This First Amendment may be executed by one or more of the parties hereto in any number of separate counterparts, and all of such counterparts taken together shall be deemed to constitute one
and the same instrument. Delivery of this First Amendment by facsimile transmission shall be effective as delivery of a manually executed counterpart hereof. 
 4.5 NO ORAL AGREEMENT. THIS FIRST AMENDMENT, THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS EXECUTED IN CONNECTION HEREWITH AND THEREWITH REPRESENT THE FINAL AGREEMENT AMONG THE PARTIES AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR UNWRITTEN ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO SUBSEQUENT ORAL AGREEMENTS BETWEEN THE PARTIES. 
 4.6 GOVERNING LAW. THIS FIRST AMENDMENT (INCLUDING, BUT NOT LIMITED TO, THE VALIDITY AND ENFORCEABILITY HEREOF) SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF TEXAS.

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 IN WITNESS WHEREOF, the parties hereto have caused this First Amendment to be duly executed as of the
date first written above. 
  

					
		 	XTO ENERGY INC.
			
		 	By:	 	 /s/ BRENT W. CLUM

		 		 	Brent W. Clum
		 		 	Vice President & Treasurer

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	 Administrative Agent, Issuing
 Bank &
Lender:
	 	JPMORGAN CHASE BANK, N.A.
			
		 	By:	 	 /s/ ROBERT C. MERTENSOTTO

		 		 	Robert C. Mertensotto
		 		 	Managing Director

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	Issuing Bank & Lender:	 	BANK OF AMERICA, N.A.
			
		 	By:	 	 /s/ RONALD E. MCKAIG

		 		 	Ronald E. McKaig
		 		 	Senior Vice President

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	Lender:	 	BNP PARIBAS
			
		 	By:	 	 /s/ BETSY JOCHER

		 	Name:	 	Betsy Jocher
		 	Title:	 	Vice President
			
		 	By:	 	 /s/ GREG SMOTHERS

		 	Name:	 	Greg Smothers
		 	Title:	 	Vice President

 S-4 
  

					
	Lender:	 	CALYON NEW YORK BRANCH
			
		 	By:	 	 /s/ BERTRAND CORD’HOMME

		 	Name:	 	Bertrand Cord’homme
		 	Title:	 	Director
			
		 	By:	 	 /s/ MICHAEL WILLIS

		 	Name:	 	Michael Willis
		 	Title:	 	Vice President

 S-5 
  

					
	Lender:	 	WACHOVIA BANK, NATIONAL ASSOCIATION
			
		 	By:	 	 /s/ PAUL PRITCHETT

		 		 	Paul Pritchett
		 		 	Vice President

 S-6 

					
	Lender:	 	CITIBANK, N.A.
			
		 	By:	 	 /s/ JAMES R. REILLY, JR.

		 		 	James F. Reilly, Jr.
		 		 	Attorney-in-Fact

 S-7 
  

					
	Lender:	 	HARRIS NESBITT FINANCING, INC.
			
		 	By:	 	 /s/ MARY LOU ALLEN

		 		 	Mary Lou Allen
		 		 	Vice President

 S-8 
  

					
	Lender:	 	SUNTRUST BANK
			
		 	By:	 	 /s/ JAMES M. WARREN

		 		 	James M. Warren
		 		 	Managing Director

 S-9 

					
	Lender:	 	ABN AMRO BANK N.V.
			
		 	By:	 	 /s/ J.A. CONN

		 		 	J. A. Conn
		 		 	Managing Director
			
		 	By:	 	 /s/ JOHN D. REED

		 		 	John D. Reed
		 		 	Director

 S-10 
  

					
	Lender:	 	BARCLAYS BANK PLC
			
		 	By:	 	 /s/ NICHOLAS A. BELL

		 	Name:	 	Nicholas A. Bell
		 	Title:	 	Director

 S-11 
  

					
	Lender:	 	DEUTSCHE BANK AG NEW YORK BRANCH
			
		 	By:	 	 /s/ FREDERICK LAIRD

		 	Name:	 	Frederick Laird
		 	Title:	 	Managing Director
			
		 	By:	 	 /s/ MING K. CHU

		 	Name:	 	Ming K. Chu
		 	Title:	 	Vice President

 S-12 

					
	Lender:	 	FORTIS CAPITAL CORP.
			
		 	By:	 	 /s/ MICHELE JONES

		 		 	Michele Jones
		 		 	Senior Vice President
			
		 	By:	 	 /s/ TROND O. ROKHOLDT

		 	Name:	 	Trond O. Rokholdt
		 	Title:	 	Managing director

 S-13 
  

					
	Lender:	 	THE ROYAL BANK OF SCOTLAND plc
			
		 	By:	 	 /s/ KEITH JOHNSON

		 	Name:	 	Keith Johnson
		 	Title:	 	Managing Director

 S-14 
  

					
	Lender:	 	WELLS FARGO BANK, N.A.
			
		 	By:	 	 /s/ CHARLES D. KIRKHAM

		 		 	Charles D. Kirkham
		 		 	Vice President

 S-15 

					
	Lender:	 	THE BANK OF NEW YORK
			
		 	By:	 	 /s/ CRAIG ANDERSON

		 		 	Craig Anderson
		 		 	Vice President

 S-16 
  

					
	Lender:	 	 THE BANK OF TOKYO-MITSUBISHI UFJ, LTD.
 HOUSTON AGENCY

			
		 	By:	 	 /s/ JOHN W. MCGHEE

		 		 	John W. McGhee
		 		 	Vice President and Manager

 S-17 
  

					
	Issuing Bank & Lender:	 	U.S. BANK NATIONAL ASSOCIATION
			
		 	By:	 	 /s/ MARK E. THOMPSON

		 		 	Mark E. Thompson
		 		 	Vice President

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 S-19 

					
	Lender:	 	COMERICA BANK
			
		 	By:	 	 /s/ PETER L. SEFZIK

		 		 	Peter L. Sefzik
		 		 	Vice President

 S-20 
  

					
	Lender:	 	UBS LOAN FINANCE LLC
			
		 	By:	 	 /s/ IRJA R. OTSA

		 	Name:	 	Irja R. Otsa
		 	Title:	 	Associate Director
		 		 	Banking Products Services, US
			
		 	By:	 	 /s/ RICHARD L. TAVROW

		 	Name:	 	Richard L. Tavrow
		 	Title:	 	Director
		 		 	Banking Products Services, US

 S-21 

					
	Lender:	 	KBC BANK, N.V.
			
		 	By:	 	 /s/ JEAN-PIERRE DIELS

		 	Name:	 	Jean-Pierre Diels
		 	Title:	 	First Vice President
			
		 	By:	 	 /s/ ERIC RASKIN

		 	Name:	 	Eric Raskin
		 	Title:	 	Vice President

 S-22 
  

					
	Lender:	 	NATEXIS BANQUES POPULAIRES
			
		 	By:	 	 /s/ LOUIS P. LAVILLE, III

		 		 	Louis P. Laville, III
		 		 	Vice President & Manager
			
		 	By:	 	 /s/ TIMOTHY POLVADO

		 		 	Timothy Polvado
		 		 	Vice President & Manager

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