Packaging Corp of America (PKG) 4: Shirley Donald R. sold 12,000 shares at $250.71 on 2026-08-… (Aug 24, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-20 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: PACKAGING CORP OF AMERICA (PKG) CIK: 0000075677 --- Reporting Owner --- Name: Shirley Donald R. CIK: 0001776032 Role: Officer (Exec. VP) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-20 | Code: S (Open market sale) Shares: -12,000 | Price: $250.71 Total Value: $3,008,496.00 Shares Owned After: 19,110 | Ownership: D (Direct) Footnotes: [F1] The price listed is the weighted average sale price. The actual sales prices for these shares ranged between $249.60 and $252.475. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request. --- Holdings --- [Holding #1] Security: Common Stock Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: The price listed is the weighted average sale price. The actual sales prices for these shares ranged between $249.60 and $252.475. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request. --- Signature --- /s/ Kent A. Pflederer, attorney in fact (2026-08-24)