Supplemental Indenture



 Exhibit 4.4 
 SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of February 25, 2010, among Koppers Ventures LLC, a
Delaware limited liability company, (the “Guaranteeing Subsidiary”), a subsidiary of Koppers Inc. (or its permitted successor), a Pennsylvania corporation (the “Issuer”), the Issuer, Koppers Holdings Inc., as
Guarantor, the other subsidiary guarantors (as defined in the Indenture referred to herein) and Wells Fargo Bank, National Association, as trustee under the Indenture referred to below (the “Trustee”). 
 W I T N E S S E T H 
 WHEREAS, the Issuer has heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of December 1, 2009 providing for the issuance of 7.875% Senior Notes due 2019 (the
“Notes”); 
 WHEREAS, the Indenture provides that under certain circumstances the Guaranteeing Subsidiary shall
execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing Subsidiary shall unconditionally guarantee all of the Issuer’s Obligations under the Notes and the Indenture on the terms and conditions set forth
herein (the “Guarantee”); and 
 WHEREAS, pursuant to Section 9.01 of the 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 Guaranteeing Subsidiary and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Note as follows: 
 1. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

 2. AGREEMENT TO GUARANTEE. The Guaranteeing Subsidiary hereby agrees to provide an unconditional Guarantee on the terms and
subject to the conditions set forth in the Guarantee and in the Indenture including but not limited to Article 10 thereof. 
 3. NO RECOURSE AGAINST OTHERS. No director, officer, employee, incorporator or stockholder of the Issuer or any Guarantor, as such, will have any liability for any obligations of the Issuer or the Guarantors under the Notes, this Indenture,
the Guarantees or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for
issuance of the Notes. The waiver may not be effective to waive liabilities under the federal securities laws. 
 4. NEW YORK
LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER
JURISDICTION WOULD BE REQUIRED THEREBY. 







 5. COUNTERPARTS. The parties may sign any number of copies of this Supplemental Indenture.
Each signed copy shall be an original, but all of them together represent the same agreement. 
 6. EFFECT OF HEADINGS. The
Section headings herein are for convenience only and shall not affect the construction hereof. 
 7. THE TRUSTEE. The Trustee
shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing
Subsidiary and the Issuer. 
 IT WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed
and attested, all as of the date first above written. 
 Dated: February 25, 2010, 
  

					
	KOPPERS VENTURES LLC
		
	By:	 	 /s/ Steven R. Lacy

		 	Name:	 	Steven R. Lacy
		 	Title:	 	Secretary


  

					
	KOPPERS INC.
		
	By:	 	 /s/ Steven R. Lacy

		 	Name:	 	Steven R. Lacy
		 	Title:	 	Senior Vice President, Administration, General Counsel & Secretary


  

					
	KOPPERS HOLDINGS INC.
		
	By:	 	 /s/ Steven R. Lacy

		 	Name:	 	Steven R. Lacy
		 	Title:	 	Senior Vice President, Administration, General Counsel & Secretary


  

					
	 Subsidiary Guarantors:

	
	WORLD-WIDE VENTURES
CORPORATION
		
	By:	 	 /s/ Steven R. Lacy

		 	Name:	 	Steven R. Lacy
		 	Title:	 	Secretary


  

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	KOPPERS DELAWARE, INC.
		
	By:	 	 /s/ Steven R. Lacy

		 	Name: Steven R. Lacy
		 	Title: Secretary


  

			
	
	KOPPERS CONCRETE PRODUCTS, INC.
		
	By:	 	 /s/ Steven R. Lacy

		 	Name: Steven R. Lacy
		 	Title: Secretary


  

			
	
	CONCRETE PARTNERS, INC.
		
	By:	 	 /s/ Steven R. Lacy

		 	Name: Steven R. Lacy
		 	Title: Secretary


  

			
	
	KOPPERS ASIA LLC
		
	By:	 	 /s/ Steven R. Lacy

		 	Name: Steven R. Lacy
		 	Title: Secretary


  

			
	
	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee
		
	By:	 	 /s/ Martin Reed

		 	Authorized Signatory
		 	Martin Reed
		 	Vice President


  

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