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Koppers Holdings Inc. Announces the Adoption of Stock Trading Plans
September 5, 2006 at 4:02 PM EDT

PITTSBURGH, Sept. 5 /PRNewswire-FirstCall/ -- Koppers Holdings Inc. (NYSE: KOP) announced today that several of its executives have adopted plans to sell Koppers stock under Rule 10b5-1 of the Securities and Exchange Act of 1934, as amended. The rule permits employees to adopt written plans at a time when they are not in possession of material nonpublic information and to sell shares according to such plans on an ongoing basis, regardless of any subsequent nonpublic information they receive. Such plans are generally adopted to gradually diversify financial holdings and minimize the market effect of such sales by spreading them over a more extended period than the traditional trading window.

The majority of sales related to these plans are scheduled to occur only upon the attainment of certain price levels for the stock. Transactions under these plans will be disclosed publicly as required through Form 144 and Form 4 filings with the Securities and Exchange Commission.

The company noted that its President and CEO Walter W. Turner has not adopted a 10b5-1 plan at present. The Company's Chief Financial Officer, Brian H. McCurrie, has adopted a 10b5-1 plan to sell up to 15,000 shares after achieving certain price levels, representing less than 25% of his current share ownership.

About Koppers

Koppers, with corporate headquarters and a research center in Pittsburgh, Pennsylvania, is a global integrated producer of carbon compounds and treated wood products. Including its joint ventures, Koppers operates facilities in the United States, United Kingdom, Denmark, Australia, China, the Pacific Rim and South Africa. The stock of Koppers Holdings Inc. is publicly traded on the New York Stock Exchange under the symbol "KOP." For more information, visit us on the Web: www.koppers.com. Questions concerning investor relations should be directed to Brian H. McCurrie at 412-227-2153 or Michael W. Snyder at 412-227- 2131.

SOURCE: Koppers Holdings Inc.

CONTACT: Brian H. McCurrie, Vice President and Chief Financial Officer of Koppers Holdings Inc., +1-412-227-2153, or McCurrieBH@koppers.com