Mark W. Kowlzan - 06 Mar 2026 Form 4 Insider Report for PACKAGING CORP OF AMERICA (PKG)

Role: Chairman & CEO, Director
Signature: Kent A. Pflederer, attorney in fact
Issuer symbol: PKG
Transactions as of: 06 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 10 Mar 2026, 14:24:37 UTC
Previous filing: 26 Feb 2026
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	10 Mar 2026	0001247456

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PKG	Common Stock	Award		+16,637	+3.7%	$0.000000^*	463,636	06 Mar 2026	Direct	F1
transaction	PKG	Common Stock	Award		+1,476	+0.32%	$0.000000^*	465,112	06 Mar 2026	Direct	F2
transaction	PKG	Common Stock	Tax liability		-8,025	-1.7%	$222.52^*	457,087	06 Mar 2026	Direct	F4
holding	PKG	Common Stock						20,263	06 Mar 2026	401k plan
holding	PKG	Common Stock						2,565	06 Mar 2026	by spouse	F3

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

Explanation of Responses:

Id	Content
F1	On March 6, 2026, the compensation subcommittee of the compensation committee of the registrant's board of directors certified attainment of the performance measure under the ROIC performance units awarded to the reporting person on February 23, 2022. The units paid out on the date of certification.
F2	Payout in shares of accumulated dividends on vesting performance units.
F3	Reporting person disclaims beneficial ownership of shares held by spouse.
F4	Pursuant to the terms of the Company's Long-Term Equity Incentive Plan, the Company withheld shares to cover the withholding tax obligation associated with equity awards vesting on the transaction date.