144 0001247456 XXXXXXXX LIVE 0000075677 PACKAGING CORP OF AMERICA 001-15399 1 NORTH FIELD CT LAKE FOREST IL 60045 8474823000 KOWLZAN MARK W 10% Stockholder Common Northern Trust Securities, INC

50 S Lasalle ST Chicago IL 60603

66640 16044579.60 89811810 11/06/2024 NYSE Common 07/05/2022 Stock Award Issuer N 9719 07/05/2022 Compensation Common 06/30/2022 Stock Award Issuer N 10703 06/30/2022 Compensation Common 06/20/2020 Stock Award Issuer N 18642 06/20/2020 Compensation Common 12/16/2016 Stock Award Issuer N 4367 12/16/2016 Compensation Common 12/16/2015 Stock Award Issuer N 4367 12/16/2015 Compensation Y Sold under: MARK WILLIAM KOWLZAN TTEE MARK WILLIAM KOWLZAN REVOC TRUST U/A 1/24/06 11/06/2024 /s/ Carmen Zamores as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for KOWLZAN MARK W