X0306 4 2018-12-17 0 0001315257 Koppers Holdings Inc. KOP 0001450800 Sullivan James A. 436 SEVENTH AVENUE PITTSBURGH PA 15219 0 1 0 0 SVP RPS, Global CM&C Common Stock 2018-12-17 4 P 0 5000 16.43 A 36157.191 D The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $16.43 to $16.44, 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. Reflects the September 28, 2018 acquisition of 175 shares of Koppers Holdings Inc. common stock acquired pursuant to the Koppers Holdings Inc. Employee Stock Purchase Plan which is exempt under both Rule 16b-3(c) and Rule 16b-3(d). /s/Steven R. Lacy, Attorney-in-Fact 2018-12-17