| 2026-08-07 | 10-Q | 10-Q filed 2026-08-07 by PACKAGING CORP OF AMERICA |
| 2026-07-23 | 8-K | 8-K filed 2026-07-23 by PACKAGING CORP OF AMERICA |
| 2026-05-13 | 8-K | 8-K filed 2026-05-13 by PACKAGING CORP OF AMERICA |
| 2026-05-08 | 10-Q | 10-Q filed 2026-05-08 by PACKAGING CORP OF AMERICA |
| 2026-04-23 | 8-K | 8-K filed 2026-04-23 by PACKAGING CORP OF AMERICA |
| 2026-03-27 | DEF 14A | DEF 14A filed 2026-03-27 by PACKAGING CORP OF AMERICA |
| 2026-03-03 | 8-K | 8-K filed 2026-03-03 by PACKAGING CORP OF AMERICA |
| 2026-02-26 | 10-K | 10-K filed 2026-02-26 by PACKAGING CORP OF AMERICA |
| 2026-01-28 | 8-K | 8-K filed 2026-01-28 by PACKAGING CORP OF AMERICA |
| 2025-12-10 | 8-K | 8-K filed 2025-12-10 by PACKAGING CORP OF AMERICA |
| 2025-12-04 | 8-K | 8-K filed 2025-12-04 by PACKAGING CORP OF AMERICA |
| 2025-11-06 | 10-Q | 10-Q filed 2025-11-06 by PACKAGING CORP OF AMERICA |
| 2025-10-23 | 8-K | 8-K filed 2025-10-23 by PACKAGING CORP OF AMERICA |
| 2025-09-02 | 8-K | 8-K filed 2025-09-02 by PACKAGING CORP OF AMERICA |
| 2025-08-15 | 8-K | 8-K filed 2025-08-15 by PACKAGING CORP OF AMERICA |
| 2025-08-07 | 10-Q | 10-Q filed 2025-08-07 by PACKAGING CORP OF AMERICA |
| 2025-08-06 | 8-K | 8-K filed 2025-08-06 by PACKAGING CORP OF AMERICA |
| 2025-07-24 | 8-K | 8-K filed 2025-07-24 by PACKAGING CORP OF AMERICA |
| 2025-07-03 | 8-K | 8-K filed 2025-07-03 by PACKAGING CORP OF AMERICA |
| 2025-07-01 | 8-K | 8-K filed 2025-07-01 by PACKAGING CORP OF AMERICA |
| 2025-05-12 | 8-K | 8-K filed 2025-05-12 by PACKAGING CORP OF AMERICA |
| 2025-05-08 | 10-Q | 10-Q filed 2025-05-08 by PACKAGING CORP OF AMERICA |
| 2025-04-23 | 8-K | 8-K filed 2025-04-23 by PACKAGING CORP OF AMERICA |
| 2025-03-27 | DEF 14A | DEF 14A filed 2025-03-27 by PACKAGING CORP OF AMERICA |
| 2025-02-28 | 8-K | 8-K filed 2025-02-28 by PACKAGING CORP OF AMERICA |
| 2025-02-27 | 10-K | 10-K filed 2025-02-27 by PACKAGING CORP OF AMERICA |
| 2025-01-29 | 8-K | 8-K filed 2025-01-29 by PACKAGING CORP OF AMERICA |
| 2024-11-07 | 10-Q | 10-Q filed 2024-11-07 by PACKAGING CORP OF AMERICA |
| 2024-10-23 | 8-K | 8-K filed 2024-10-23 by PACKAGING CORP OF AMERICA |
| 2024-08-08 | 10-Q | 10-Q filed 2024-08-08 by PACKAGING CORP OF AMERICA |