X0306 4 2019-02-27 0 0000075677 PACKAGING CORP OF AMERICA PKG 0001318252 Hassfurther Thomas A 1955 WEST FIELD COURT LAKE FOREST IL 60045 0 1 0 0 Exec. VP Common Stock 2019-02-27 4 A 0 16024 0.00 A 187014 D Common Stock 9975 I by 401(k) plan Common Stock 53862 I By Spouse On February 27, 2019, the Section 162(m) subcommittee of the compensation committee of the registrant's board of directors certified attainment of the performance measure under the performance units awarded to reporting person on June 25, 2015. Performance was achieved at the 100% level, which will result in the reported number of shares being paid out on June 25, 2019, the vesting date of the units, subject to continued service by the reporting person through such date. The committee has the discretion to award additional shares up to 20% of the number of units on or around the vesting date. At the time of vesting, reporting person will also be awarded shares with a value equal to the total dividends declared prior to vesting on the shares that are paid out. Reporting person disclaims beneficial ownership of shares held by spouse. Kent A. Pflederer, attorney in fact 2019-02-28