X0304 4 2012-02-21 0 0001315257 Koppers Holdings Inc. KOP 0001349533 Hillenbrand David M 436 SEVENTH AVENUE PITTSBURGH PA 15219 1 0 0 0 Common Stock 2012-02-21 4 S 0 6000 38.8965 D 7080 D The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.825 to $38.935, inclusive. The reporting person undertakes to provide to the Securities and Exchange Commission, the issuer or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price. Steven R. Lacy, Attorney-in-Fact 2012-02-23