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Mark W. Kowlzan is 71 years old and has served as Chief Executive Officer and a director of PCA since July 2010 and as Chairman since January 2016. From 1998 through June 2010, Mr. Kowlzan led PCA'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 operating positions with PCA in its mill operations, including as manager of the Counce, Tennessee linerboard mill. Prior to joining PCA, Mr. Kowlzan spent 15 years at International Paper Company, where he held a series of operational and managerial positions within its mill organization. Mr. Kowlzan has been a member of the board of directors of American Forest & Paper Association since February 2011.

Thomas A. Hassfurther, 69, 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, 65, 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.

D. Ray Shirley, 53, 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.

Kent A. Pflederer, age 54, PCA's Senior Vice President, General Counsel and Secretary, will become Packaging Corporation of America's Executive Vice President and Chief Financial Officer on May 1, 2025 and will serve as PCA's principal accounting officer and principal financial officer. Mr. Pflederer was promoted to his current position in 2013 and served as Vice President, General Counsel and Secretary from 2007 to 2013. Kent A. Pflederer, Senior Vice President, General Counsel and Secretary - Mr. Pflederer has served as Senior Vice President, General Counsel and Corporate Secretary since January 2013 and has led our legal department since June 2007. 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.

Karen E. Gowland is 67 years old and has served as a director of PCA since May 2024. Before her retirement in March 2014, Ms. Gowland was Vice President, General Counsel, and Corporate Secretary for Boise Inc, a manufacturer of packaging and paper products, from February 2008 to July 2010 and Senior Vice President, General Counsel and Corporate Secretary from July 2010 until we acquired Boise in October 2013. From October 2004 to February 2008, Ms. Gowland served as Vice President, General Counsel, and Corporate Secretary of Boise Cascade, L.L.C. During her 30 years in the forest products, paper and packaging industries, Ms. Gowland held various legal and compliance positions, which included over 15 years of experience as a corporate secretary for various public and private entities. Ms. Gowland currently serves on the board of directors of Boise Cascade Company, a producer of engineered wood products and plywood and a distributor of building products.

Paul T. Stecko is 80 years old and has served as a director of PCA since March 1999, including as Chairman from March 1999 through December 2015. He served as a Senior Advisor to PCA from December 2015 through the end of 2017. He served as Executive Chairman of PCA from July 2010 until his retirement as an officer and employee of the company in December 2013. Mr. Stecko served as Chief Executive Officer of PCA from January 1999 to July 2010. From January 1997 to April 1999, Mr. Stecko served as Chief Operating Officer of Tenneco, Inc. From December 1993 through January 1997, Mr. Stecko served as President and Chief Executive Officer of Tenneco Packaging Inc. Prior to joining Tenneco Packaging, Mr. Stecko spent 16 years with International Paper Company. Mr. Stecko has served on the board of directors of Tenneco, Inc. during the past five years. On February 25, 2026, Paul T. Stecko informed the Board of Directors of Packaging Corporation of America that he has decided to retire from service on the Board and will not stand for reelection to the Board at the 2026 Annual Meeting of Stockholders.

Cheryl K. Beebe is 70 years old and has served as a director of PCA since May 2008. From February 2004 until her retirement in February 2014, Ms. Beebe served as the Chief Financial Officer of Ingredion Incorporated (formerly named Corn Products International, Inc.), a manufacturer and seller of a number of ingredients to food and industrial customers. Ms. Beebe previously served Ingredion as Vice President, Finance from July 2002 to February 2004, as Vice President from February 1999 to 2004 and as Treasurer from 1997 to February 2004. From 1980 to 1997, she served in various financial positions of increasing responsibility for Corn Products. Ms. Beebe is a member of the board of directors of The Mosaic Company and served on the boards of directors of Convergys Corporation and Hanesbrands, Inc. during the past five years. Ms. Beebe is a trustee of Goldman Sachs Asset Management funds.

Samuel M. Mencoff is 69 years old and has served as a director of PCA since January 1999 and served as Vice President of PCA from January 1999 through January 2000. Mr. Mencoff has been employed principally by Madison Dearborn Partners, LLC, a private equity firm, since 1993 and currently serves as Senior Advisor, after having served as Co-Chief Executive Officer from 2008 to 2023. From 1987 until 1993, Mr. Mencoff served as Vice President of First Chicago Venture Capital.

Donna A. Harman is 66 years old and has served as a director of PCA since December 2019. She served as President and Chief Executive Officer of American Forest and Paper Association (AF&PA), the national trade association of the paper and wood products industries, from 2007 until her retirement in 2019. Earlier in her career, she held positions as AF&PA's Senior Vice President, Policy and Government Affairs, served in governmental affairs for Champion International Corporation and The Dow Chemical Company and served as a legislative assistant in Congress. Ms. Harman is the 2019 recipient of the Bryce Harlow award, which recognizes her exemplary career in business-government relations.

Thomas S. Souleles is 57 years old and has served as a director of PCA since September 2010, and previously served on PCA's Board of Directors from 1999 to 2008. Mr. Souleles has been employed principally by Madison Dearborn Partners, LLC, a private equity firm, since 1995 and currently serves as Vice Chairman, to which he was appointed in 2024 after having served as Co-Chief Executive Officer, to which he was appointed in 2023, and previously as Managing Director concentrating on investments in the basic industries sector.

Roger B. Porter is 79 years old and has served as a director of PCA since May 2005. Mr. Porter is currently the IBM Professor of Business and Government at Harvard University and has served on the faculty at Harvard University since 1977. Mr. Porter also held senior economic policy positions in the Gerald Ford, Ronald Reagan and George H.W. Bush White Houses, serving as special assistant to the President and executive secretary of the Economic Policy board from 1974 to 1977, as deputy assistant to the President and director of the White House Office of Policy Development from 1981 to 1985, and as assistant to the President for economic and domestic policy from 1989 to 1993. Mr. Porter is also a director of Extra Space Storage Inc. and has served as a director of Extra Space Storage Inc., Zions Bancorporation and Tenneco, Inc. during the last five years.

Robert C. Lyons is 62 years old and has served as a director of PCA since August 2011. Mr. Lyons has served as President and Chief Executive Officer of, and has served on the board of directors of, GATX Corporation, a rail, marine and industrial equipment leasing company, since April 2022. Prior to that, Mr. Lyons served as Executive Vice President and President-Rail North America of GATX Corporation from August 2018 to April 2022 and as Chief Financial Officer of GATX from November 2004 to August 2018. Mr. Lyons has been employed by GATX since 1997 and served in various positions of increasing responsibility through 2004. Prior to his employment with GATX, Mr. Lyons worked for the Financial Relations Board and in the corporate banking division of The Bank of Tokyo- Mitsubishi.

Duane C. Farrington is 67 years old and has served as a director of PCA since August 2015. Mr. Farrington was employed by State Farm Mutual Automobile Insurance Company from 1980 until his retirement in 2020. He served State Farm as Senior Vice President for Sales and Operations in the mid-Atlantic operation from 2005 to 2008. He moved to the corporate headquarters in 2009 and was named Executive Vice President and Chief Administrative Officer in 2013 and served in such position until he retired in 2020. In his State Farm senior leadership role, he had overall responsibility for the organization's information technology, systems and business integration, information security, and innovation functions. Mr. Farrington earned the Chartered Property Casualty Underwriter (CPCU) designation in 1995. Mr. Farrington was chosen to serve on our board primarily because of his extensive experience with information technology and security, as well as his business experience gained from 40 years of service at State Farm. Mr. Farrington self identifies as an African-American male.

Fabian C. Strauss, age 45, PCA's Vice President, Controller and Treasurer, was promoted to PCA's Senior Vice President - Finance, Controller & Treasurer on March 1, 2026, and he will serve as PCA's principal accounting officer. Mr. Strauss joined PCA in January 2022 as Executive Director, Assistant Controller, and he was promoted to his current position in 2024. Immediately prior to joining PCA, Mr. Strauss was the Chief Accounting Officer at EOS Energy Storage, Inc. from November 2020 until January 2022. Mr. Strauss also previously worked for PriceWaterhouseCooopers LLP, Walgreens Company, and Treehouse Foods.

Heidi L. Patton, 56, 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, 62, 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.

Darla J. Olivier, 55, 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.