X0306 4 2020-02-25 0 0000075677 PACKAGING CORP OF AMERICA PKG 0001318252 Hassfurther Thomas A 1 N. FIELD COURT LAKE FOREST IL 60045 0 1 0 0 Exec. VP Common Stock 2020-02-25 4 A 0 13634 0.00 A 168205 D Common Stock 2020-02-25 4 A 0 21459 0.00 A 189664 D Common Stock 10257 I by 401(k) plan Common Stock 53862 I By Spouse Common Stock 34293 I Through investment entity Award of restricted stock. On February 25, 2020, 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 20, 2016. Performance was achieved at the 100% level, which will result in the reported number of shares being paid out on June 20, 2020, the vesting date of the units, subject to continued service by the reporting person through such date. Reporting person disclaims beneficial ownership of shares held by spouse. Kent A. Pflederer, attorney in fact 2020-02-27