PACKAGING CORP OF AMERICA

Brief statements setting forth the age at February 26, 2026, the principal occupation, employment during the past five years, the year in which such person first became an officer of PCA, and other information concerning each of our executive officers appears below.

Mark W. Kowlzan, 70, Chairman and Chief Executive Officer - Mr. Kowlzan has served as PCA’s Chairman since January 2016 and as Chief Executive Officer and a director since July 2010. From 1998 through June 2010, Mr. Kowlzan led the company’s containerboard mill system, first as Vice President and General Manager and then as Senior Vice President - Containerboard. From 1996 through 1998, Mr. Kowlzan served in various senior mill-related operating positions with PCA and Tenneco Packaging, including as manager of the Counce linerboard mill. Prior to joining Tenneco Packaging, Mr. Kowlzan spent 15 years at International Paper, a global paper and packaging company, where he held a series of operational and managerial positions within its mill organization. Mr. Kowlzan is a member of the board of American Forest and Paper Association.

Thomas A. Hassfurther, 70, President - Mr. Hassfurther was promoted to President of PCA in February 2025. Mr. Hassfurther previously served as Executive Vice President - Corrugated Products of PCA from September 2009 to February 2025 and as Senior Vice President - Sales and Marketing, Corrugated Products from February 2005 to September 2009. Prior to this, he held various senior-level management and sales positions at PCA and Tenneco Packaging. Mr. Hassfurther joined the company in 1977.

Charles J. Carter, 66, Executive Vice President - Mill Operations - Mr. Carter has led our mill operations since January 2011. From March 2010 to January 2011, Mr. Carter served as PCA’s Director of Papermaking Technology. Prior to joining PCA in 2010, Mr. Carter spent 28 years with various pulp and paper companies in managerial and technical positions of increasing responsibility, most recently as Vice President and General Manager of the Calhoun, Tennessee mill of Abitibi Bowater from 2007 to 2010 and as manager of SP Newsprint’s Dublin, Georgia mill from 1999 to 2007.

Kent A. Pflederer, 55, Executive Vice President and Chief Financial Officer - Mr. Pflederer has served as our Chief Financial Officer since 2025. He previously served as General Counsel and Corporate Secretary from May 2007 to April 2025. Prior to joining PCA, Mr. Pflederer served as Senior Counsel, Corporate and Securities, at Hospira, Inc. from 2004 to 2007 and served in the corporate and securities practice at Mayer Brown, LLP from 1996 to 2004.

D. Ray Shirley, 54, Executive Vice President – Corrugated Products - Mr. Shirley was promoted to Executive Vice President – Corrugated Products in February 2025. From May 2019 to February 2025, Mr. Shirley served as PCA’s Senior Vice President – Corporate Engineering and Process Technology. Mr. Shirley previously served as PCA’s Vice President – Containerboard Mills Engineering and Process Technology from 2012 to 2019 and as Mill Manager at PCA’s Counce, Tennessee containerboard mill from 2010 to 2012. He has served in various management roles within the company, including the Operations Manager at the Filer City, Michigan containerboard mill. Before joining PCA in 1996, Mr. Shirley worked for Georgia-Pacific Corporation.

Darla J. Olivier,56, Senior Vice President – Tax, ESG and Government Affairs -Ms. Olivier has led our tax department since 1994 and served as Vice President—Tax from October 2010 to January 2022. In January 2022, she was promoted to Senior Vice President—Tax, ESG and Government Affairs, and leads our sustainability reporting and government affairs functions. Before joining PCA, Ms. Olivier worked for Coopers & Lybrand LLP, Alberto-Culver Company and SPX Corporation.

Heidi L. Patton, 57, Senior Vice President – Containerboard Sales and Supply Chain- Ms. Patton has served as Senior Vice President – Containerboard Sales and Supply Chain since January 2025. She previously served as Vice President – Containerboard Sales since 2014 and as General Manager, Containerboard Sales and Trade Manager since she joined PCA in 1996.

Joseph W. Vaughn, 63, Senior Vice President – Engineering and Operations Support - Mr. Vaughn has served as our Senior Vice President – Engineering and Operations Support since 2024. Mr. Vaughn previously served as Vice President – Engineering and Project Management. Prior to joining PCA in 2017, he spent 30 years with various pulp and paper companies in managerial and engineering positions of increasing responsibility.

Available Information

PCA’s internet website address iswww.packagingcorp.com. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 are available free of charge through our website as soon as reasonably practicable after they are electronically filed with, or furnished to, the Securities and Exchange Commission. In addition, our Code of Ethics may be accessed in the Investor Relations section of PCA’s website. PCA’s website and the information contained or incorporated therein are not intended to be incorporated into this report.