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Mr. Ball has served as Chief Executive Officer of the company and Koppers Inc., our wholly-owned subsidiary, since January 2024, and as Chair of the board of directors of the company, since May 2025. Mr. Ball previously served as President and Chief Executive Officer of the company and Koppers Inc. from January 2015 through December 2023. Mr. Ball has been a director of Koppers Inc. since May 2013. Mr. Ball has served as a director of ATI Inc., a publicly traded company and global manufacturer of technically advanced specialty materials and complex components, since February 2019, and as a director of Highmark Inc., a health insurance organization and independent licensee of the Blue Cross Blue Shield Association, since January 2023. Other Public Company Directorships: ATI Inc.

Mr. Sullivan has served as President and Chief Transformation Officer of Koppers Holdings Inc. and Koppers Inc. since June 2025. Mr. Sullivan served as President and Chief Operating Officer of Koppers Holdings Inc. and Koppers Inc. from January 2024 to May 2025. Mr. Sullivan served as Executive Vice President and Chief Operating Officer of Koppers Holdings Inc. and Koppers Inc. from January 2020 to December 2023.

Ms. Apostolou has served as Chief Legal and Sustainability Officer and Secretary since January 2025. Ms. Apostolou served as General Counsel and Secretary of Koppers Holdings Inc. and Koppers Inc. from March 2020 to December 2024. Ms. Apostolou has served as a Director of Koppers Inc. since March 2020. From January 2019 to February 2020, Ms. Apostolou served as Deputy General Counsel and Assistant Secretary of Koppers Holdings Inc. and Koppers Inc.

Mr. Lucas has served as Senior Vice President, Culture and Engagement, Koppers Inc. since January 2025. Mr. Lucas served as Vice President, Culture and Engagement, Koppers Inc. from April 2022 to December 2024. Prior to joining Koppers, from July 2014 to April 2022, Mr. Lucas served as Vice President, Human Resources of AMETEK, Inc., a publicly traded manufacturer of electronic instruments and electromechanical devices.

Ms. Wilkerson has served as the Executive Vice President and Chief People Officer of Bloom Energy Corporation, a public company which designs, manufactures and sells solid-oxide fuel cell systems, since January 2019. From December 2016 to January 2019, Ms. Wilkerson served as the Senior Vice President, Human Resources, at Infinera Corporation, a vertically integrated packet-optical solutions provider serving the largest network operators in the world. From November 2014 to December 2016, Ms. Wilkerson served as Vice President, Human Resources, at Hewlett Packard Enterprise Company. From October 2004 to October 2014, Ms. Wilkerson served as Director, Human Resources, at Cisco Systems, Inc.

Mr. Motley has served as Managing Partner with BlueTree Venture Fund, a venture fund based in Pittsburgh, Pennsylvania, since April 2012. In addition, Mr. Motley has served as Chief Executive Officer and President of MCAPS, LLC, a professional services company, since January 2018, and as Managing Partner of BTN Ventures, LLC, a venture fund investing in seed state software companies with black and/or diverse founders, since January 2021. Mr. Motley has served as a director of F.N.B. Corporation, a public financial services corporation, since July 2013. Mr. Motley has served as a director of Coherent Corp. (formerly known as II-VI Incorporated), a public company and a worldwide leader in engineered materials, opto-electronic components and devices, since February 2021. Mr. Motley also served as a director of Deep Lake Capital Acquisition Corp., a formerly publicly-listed special purpose acquisition company formed for the purpose of entering into a combination with one or more businesses, from January 2021 to January 2023. With more than 30 years of experience across multiple industries, Mr.?Motley began with technical roles with PPG Industries Chemicals Division and culminated in vice president and group management roles with Philips Respironics and Covidien, Inc. Mr.? Motley also serves as board chair of SRI, Inc. (formerly known as Stanford Research Institute). Other Public Company Directorships: F.N.B. Corporation, Coherent Corp.

Dr. Feng served as Director of Science and Technology and Global Analytical Sciences of PPG Industries, Inc., a publicly traded global supplier of paints, coatings, optical products, and specialty materials, from May 2020 to June 2023. From June 2018 to May 2020, Dr. Feng served as Director of Research, Industrial and Packaging Coatings of PPG Industries, Inc. Dr. Feng has served as sole owner of Double Stallion Consulting LLC since October 2025, through which she provides management and innovation consulting services.Dr. Feng holds a Ph.D. in inorganic chemistry, which has provided her with a strong technical background and expertise in the specialty chemicals industry. Dr. Feng's technical and industry experience, her experience in risk management and regulatory compliance, and her knowledge of environmental risks and best practices, developed through her leadership positions with PPG Industries, Inc., The University of Chicago Pritzker School of Molecular Engineering, Bayer MaterialScience LLC and Lanxess Corporation, provide an invaluable perspective to the board's discussions.

Mr. Sandifer has served as Executive Vice President and Chief Financial Officer of FMC Corporation, a publicly traded global agricultural sciences company, since May 2018. Mr. Sandifer serves on the board of trustees of Germantown Academy, a private school near Philadelphia, Pennsylvania, where he is a member of the finance and audit committees. He was a member of the board of directors of Philabundance, the leading hunger relief organization in the Delaware Valley, from 2014 to 2022, serving as board treasurer and chair of the finance committee from 2017 to 2022.

Ms. Jensen served as Executive Vice President and Chief Administrative Officer of H.B. Fuller Company, a publicly traded global adhesives manufacturer, from December 2022 to December 2024. Ms. Jensen served as Vice President, Global Business Process Improvement at H.B. Fuller Company from January 2020 through December 2022, and as Senior Vice President, Global Construction Adhesives at H.B. Fuller Company from September 2016 to January 2020. Since January 2026, Ms. Jensen has served as a director of Teckrez, LLC, a private company that develops, markets and stocks tackifier resins and acrylic monomers. Additionally, Ms. Jensen serves on the Dean's Council of the Indiana University Kelley School of Business, and previously served on the board of the H.B. Fuller Foundation and as Executive Committee Chairman on the Adhesives and Sealants Council. The board has appointed Traci L. Jensen to serve as lead independent director, effective May 7, 2026.

Mr. Vartanian has served as the Chairman of MSA Safety Incorporated (MSA), a publicly traded global developer, manufacturer and supplier of safety products and software that protect people and facility infrastructures, since May 2024. Since joining MSA in 1985, Mr. Vartanian has served in a variety of roles of increased responsibility, including as President of MSA North America, and Senior Vice President and President of MSA Americas. Mr. Vartanian served as the Chairman and Chief Executive Officer of MSA from June 2023 to May 2024, as the Chairman, President and Chief Executive Officer of MSA from May 2020 to May 2023 and as the President and Chief Executive Officer of MSA from May 2018 to May 2020. Mr. Vartanian has served as a director of MSA since December 2017, and as a director of Highmark Health, a national blended health organization headquartered in Pittsburgh, Pennsylvania, since July 2024. Mr. Vartanian serves on the board of trustees for the International Association of Firefighters Foundation. He is also a director of the Federal Reserve Bank of Cleveland, Pittsburgh Branch. Other Public Company Directorships: MSA Safety Incorporated

Ms. Posadas has served as Chief Executive Officer of Canlak Coatings Inc., a formulator and manufacturer of high-quality wood coating systems, since October 2024. Ms. Posadas served as Chief Commercial Officer of Matrix Adhesives Group, a provider of advanced adhesive and sealant solutions, from January 2023 to October 2024, and as Regional President, Americas of Castrol for BP p.l.c., the global integrated energy company, from December 2019 to December 2022.Ms. Posadas also serves on the board of directors and chairs the advisory arm of Coqual.

Mr. Pearce, age 59, has served as Chief Accounting Officer of the Company since May 2019. Previously, he served as Director, Corporate Control and Taxes of Koppers Inc. from April 2008 to April 2019 and as Director, Corporate Control of Koppers Inc. from April 2006 to March 2008. Bradley A. Pearce, Koppers' Chief Accounting Officer, has been elected by the Company's Board of Directors to act as Koppers' interim Chief Financial Officer and Chief Accounting Officer, in which position he serves as the Company's principal financial officer, effective January 5, 2026. Bradley A. Pearce, interim Chief Financial Officer and Treasurer and Chief Accounting Officer, will return to his previous role as the Company's Chief Accounting Officer, effective May 26, 2026.

Mr. Lovalekar has served as Vice President, Information Technology, Koppers Inc. since March 2016.