PITTSBURGH, Feb. 7 /PRNewswire-FirstCall/ -- February 6, 2006 - Koppers Holdings Inc. (the "Company") (NYSE:KOP) announced today that it has consummated its initial public offering of 11,500,000 shares of common stock, of which 8,700,000 shares were offered by the Company and 2,800,000 were offered by shareholders of the Company. The shares sold by the selling shareholders included 1,500,000 shares sold in connection with the exercise in full by the underwriters of their over-allotment option. Credit Suisse Securities (USA) LLC and UBS Securities LLC acted as joint book-running managers of the offering and First Analysis Securities Corporation, Jefferies & Company, Inc. and KeyBanc Capital Markets, a division of McDonald Investments Inc., acted as co-managers for the offering. A copy of the prospectus relating to these securities may be obtained from the prospectus department of either Credit Suisse Securities (USA) LLC, 11 Madison Avenue, New York, New York 10010, 212-325-2580 or UBS Securities LLC, 299 Park Avenue, New York, New York 10171, 212-821-3000. The registration statement relating to these securities has been filed with and declared effective by the Securities and Exchange Commission. This release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any State in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such State. Koppers Holdings Inc. is a global integrated producer of carbon compounds and treated wood products. Including its joint ventures, Koppers operates 36 facilities in the United States, United Kingdom, Denmark, Australia, China, the Pacific Rim and South Africa. First Call Analyst: FCMN Contact: hilinskirm@koppers.com DATASOURCE: Koppers Holdings Inc. CONTACT: Brian H. McCurrie, Vice President, Chief Financial Officer of Koppers Holdings Inc., +1-412-227-2153, or Web site: http://www.koppers.com/

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