X0306 4 2022-05-05 0001315257 Koppers Holdings Inc. KOP 0001245155 WILKERSON SONJA MICHELLE 436 SEVENTH AVENUE PITTSBURGH PA 15219 1 Restricted Stock Units 2022-05-05 4 A 0 4326 0 A Common Stock 4326 4326 D Restricted Stock Units represent the right to receive shares of common stock on a one-for-one basis. The Restricted Stock Units become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person. /s/ Stephanie L. Apostolou, Attorney in Fact 2022-05-05