X0306 4 2021-12-31 1 0001315257 Koppers Holdings Inc. KOP 0001260399 ZUGAY MICHAEL 436 SEVENTH AVENUE PITTSBURGH PA 15219 0 1 0 0 CFO Common Stock 2021-12-31 4 F 0 9090 31.30 D 68635 D Common Stock 2021-12-31 4 D 0 3946 0.00 D 64689 D Shares surrendered to the issuer by the reporting person as payment for tax withholding related to the vesting of time-based restricted stock units. Includes 659 shares of Koppers Holdings Inc. common stock acquired pursuant to the Koppers Holdings Inc. Employee Stock Purchase Plan on June 30, 2021 and September 30, 2021. These acquisitions were exempt under both Rule 16b-3(c) and Rule 16b-3(d). This reported disposition involved a forfeiture of restricted stock units in connection with the retirement of the reporting person. /s/Stephanie L. Apostolou, Attorney in Fact 2022-01-04