Mark W. Kowlzan - Sep 11, 2025 Form 4 Insider Report for PACKAGING CORP OF AMERICA (PKG)

Role: Chairman & CEO, Director
Signature: Kent A. Pflederer, attorney in fact
Stock symbol: PKG
Transactions as of: Sep 11, 2025
Transactions value $: -$5,399,250
Form type: 4
Date filed: 9/15/2025, 11:53 AM
Previous filing: Apr 8, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
KOWLZAN MARK W	Chairman & CEO, Director	1 N. FIELD COURT, LAKE FOREST	Kent A. Pflederer, attorney in fact	2025-09-15	0001247456

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PKG	Common Stock	Sale	-$5.4M	-25K	-5.41%	$215.97	437K	Sep 11, 2025	Direct	F1
holding	PKG	Common Stock						19.6K	Sep 11, 2025	401k plan
holding	PKG	Common Stock						2.57K	Sep 11, 2025	by spouse	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The price listed is the weighted average sale price. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request.
F2	Reporting person disclaims beneficial ownership of shares held by spouse.