X0306 4 2022-03-03 0 0001315257 Koppers Holdings Inc. KOP 0001684691 Smith Jimmi Sue 436 SEVENTH AVENUE PITTSBURGH PA 15219 0 1 0 0 CFO and Treasurer Common Stock 2022-03-03 4 F 0 841 28.96 D 16722 D Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of time-based restricted stock units. Includes 133 shares of Koppers Holdings Inc. common stock acquired pursuant to the Koppers Holdings Inc. Employee Stock Purchase Plan on December 31, 2021. These acquisitions were exempt under both Rule 16b-3(c) and Rule 16b-3(d). /s/Stephanie L. Apostolou, Attorney in Fact 2022-03-07