X0306 4 2018-03-02 0 0001315257 Koppers Holdings Inc. KOP 0001450800 Sullivan James A. 436 SEVENTH AVENUE PITTSBURGH PA 15219 0 1 0 0 SVP Global CM&C Common Stock 2018-03-02 4 A 0 2884 0.00 A 17233.191 D Common Stock 2018-03-02 4 M 0 483 0.00 A 17716.191 D Common Stock 2018-03-02 4 A 0 22410 0.00 A 40126.191 D Common Stock 2018-03-02 4 F 0 10453 41.60 D 29673.191 D Employee Stock Options (Rights to Buy) 41.60 2018-03-02 4 A 0 11009 0.00 A 2028-03-02 Common Stock 11009 11009 D Restricted Stock Units 2018-03-02 4 M 0 483 0.00 A Common Stock 483 1452 D Restricted stock units convert into common stock on a one-for-one basis. Represents previously granted performance share units for which the performance criteria for the three-year performance period of 2015 through 2017 have been satisfied. Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of time-based and performance-based restricted stock units. Includes 500 shares of Koppers Holdings Inc. common stock acquired pursuant to the Koppers Holdings Inc. Employee Stock Purchase Plan ("ESPP") as of December 29, 2017, the date of the latest available statement of the reporting person's ESPP Holdings. These acquisitions were exempt under both Rule 16b-3(c) and Rule 16b-3(d). The reporting person was granted stock options on March 2, 2018, which will vest in four equal annual installments, with the first installment vesting on March 2, 2019. On March 3, 2017, the reporting person was granted restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date. /s/Steven R. Lacy, Attorney-in-Fact 2018-03-06