X0306 4 2022-01-04 0 0001315257 Koppers Holdings Inc. KOP 0001806249 Apostolou Stephanie L 436 SEVENTH AVENUE PITTSBURGH PA 15219 0 1 0 0 General Counsel & Secretary Common Stock 2022-01-04 4 A 0 3204 0.00 A 22547.8708 D Employee Stock Options (Right to Buy) 32.19 2022-01-04 4 A 0 5868 0.00 A 2032-01-04 Common Stock 5868 5868 D The reporting person was awarded time-based restricted stock units on January 4, 2022, which will vest in annual installments of 25 percent over four years. Includes 736 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). The reporting person was granted stock options on January 4, 2022, which will vest in annual installments of 25 percent over four years. /s/Stephanie L. Apostolou 2022-01-06