X0306 4 2022-03-02 0 0001315257 Koppers Holdings Inc. KOP 0001450800 Sullivan James A. 436 SEVENTH AVENUE PITTSBURGH PA 15219 0 1 0 0 EVP, Chief Operating Officer Common Stock 2022-03-02 4 F 0 254 28.49 D 65449.191 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. /s/Stephanie L. Apostolou, Attorney in Fact 2022-03-04