X0306 4 2022-01-05 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 2022-01-05 4 F 0 425 33.27 D 17430 D Restricted Stock Units 2022-01-05 4 A 0 1346 0.00 A Common Stock 1346 1346 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. Restricted stock units represent the right to receive shares of common stock on a one-for-one basis and may be settled in cash or in shares of common stock. On January 4, 2021, the reporting person was granted performance share units for which the performance criteria for the one-year performance period from January 1, 2021 through December 31, 2021 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2024. If the Company's total shareholder return over the three-year period of January 1, 2021 through December 31, 2023 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number. /s/Stephanie L. Apostolou, Attorney in Fact 2022-01-07