Apr 1992 Joined the Company Feb 2017 Representative Director, President, Sekisui Plastics Chubu Co., Ltd. Jun 2018 Executive Officer of the Company; Representative Director, President, Sekisui Plastics Chubu Co., Ltd. Nov 2018 Executive Officer of the Company; General Manager, Corporate Planning Department, Corporate Strategy Division May 2021 Executive Officer of the Company; General Manager, 1st Business Division; in charge of Business Research Office Jun 2021 Director, Managing Executive Officer; General Manager, 1st Business Division; in charge of Business Research Office Apr 2022 Director, Managing Executive Officer; General Manager, 1st Business Division Jun 2024 Director, Senior Managing Executive Officer; General Manager, 1st Business Division; in charge of Business Apr 2025 Director, Senior Managing Executive Officer; in charge of overall Business Division Jun 2025 Representative Director, President and Executive Officer (current)

Apr 1983 Joined the Company Jun 2013 Director; General Manager, Planning Department, 2nd Business Division Apr 2014 Executive Officer; General Manager, Planning Departments, 2nd and 3rd Business Divisions Feb 2017 Executive Officer; General Manager, Corporate Planning Center, Business Strategy Division Jun 2017 Managing Executive Officer; General Manager, Corporate Planning Center, Business Strategy Division Jun 2018 Director, Managing Executive Officer; General Manager, Corporate Strategy Division Jun 2021 Director, Senior Managing Executive Officer; General Manager, Corporate Strategy Division Apr 2023 Director, Senior Managing Executive Officer; General Manager, Corporate Strategy Division; in charge of Administration Division Jun 2024 Director, Senior Managing Executive Officer; General Manager, Corporate Strategy Division; in charge of Administration (current)

Apr 1989 Joined the Company Mar 2016 General Manager, Global Technical Center, 2nd Business Division Jun 2016 Executive Officer; General Manager, Global Technical Center, 2nd Business Division Apr 2019 Executive Officer; General Manager, R&D Center; General Manager, Development Department Apr 2020 Executive Officer; General Manager, R&D Center; Director, Fundamental Research Laboratory Jun 2020 Director, Managing Executive Officer; General Manager, R&D Center; Director, Fundamental Research Laboratory Apr 2022 Director, Managing Executive Officer; General Manager, R&D Center; General Manager, GX Promotion Department Jun 2024 Director, Managing Executive Officer; General Manager, R&D Center; General Manager, GX Promotion Department; in charge of Group Environmental Matters Apr 2025 Director, Managing Executive Officer; General Manager, Production Technology Center and R&D Center; in charge of Group Environmental Matters Apr 2026 Director, Managing Executive Officer; General Manager, Environment, Safety & Quality Assurance Center; in charge of Production, R&D and Environment (current)

Apr 1987 Joined the Company Jun 2011 General Manager, Technology Department, 1st Business Division Jun 2012 Director; General Manager, Technology Department, 1st Business Division Jun 2013 Executive Officer; General Manager, Technology Department, 1st Business Division Apr 2014 Executive Officer; General Manager, Global Technical Center, 2nd Business Division Mar 2016 Executive Officer; General Manager, Technology Department, 1st Business Division Jun 2018 Managing Executive Officer; General Manager, Technology Department, 1st Business Division Apr 2019 Managing Executive Officer; General Manager, Production Technology Center Oct 2024 Managing Executive Officer; General Manager, Production Technology Center; General Manager, Molding and Processing Technology Department Jan 2025 Managing Executive Officer; General Manager, Production Technology Center Apr 2025 Managing Executive Officer; General Manager, 1st Business Division Jun 2025 Director, Managing Executive Officer; General Manager, 1st Business Division (current)

Apr 1993 Joined the Company May 2021 General Manager, Corporate Planning Department, Corporate Strategy Division Jun 2024 Executive Officer; General Manager, Corporate Planning Department, Corporate Strategy Division Apr 2025 Managing Executive Officer; General Manager, 2nd Business Division Jun 2025 Director, Managing Executive Officer; General Manager, 2nd Business Division (current)

Apr 1981 Joined Nagase & Co., Ltd. Apr 2010 Executive Officer, Nagase & Co., Ltd. Jun 2015 Director, Executive Officer, Nagase & Co., Ltd. Apr 2016 Director, Managing Executive Officer, Nagase & Co., Ltd. Apr 2019 Representative Director, Managing Executive Officer, Nagase & Co., Ltd. Jun 2021 Advisor, Nagase & Co., Ltd. Jun 2023 Outside Director of the Company (current) Outside Statutory Auditor, Dainichiseika Color & Chemicals Mfg. Co., Ltd. (concurrent, current) Jun 2025 Outside Director (Audit and Supervisory Committee Member), Dainichiseika Color & Chemicals Mfg. Co., Ltd. (concurrent, current)

Apr 1982 Joined Sumitomo Electric Industries, Ltd. Jun 2009 Executive Officer, Sumitomo Electric Industries, Ltd. Jun 2015 Full-time Statutory Auditor, Sumitomo Electric Industries, Ltd. Jun 2022 Advisor, Sumitomo Electric Industries, Ltd. Jun 2023 Statutory Auditor, Techno Associe Co., Ltd. (concurrent, current) Jun 2024 Outside Director of the Company (current)

Apr 1982 Joined the Ministry of Finance Jul 2010 Director, National Property Division, Financial Bureau, Ministry of Finance Jul 2012 General Manager, General Affairs Department, National Federation of Mutual Aid Associations for Government Employees Jan 2014 Secretary General, Specific Personal Information Protection Commission Jan 2016 Secretary General, Personal Information Protection Commission Mar 2021 Outside Director, Sumitomo Rubber Industries, Ltd. (concurrent, current) Sep 2023 Advisor, Digital Agency (concurrent, current) Jun 2025 Outside Director of the Company (current)

Apr 1986 Joined the Company May 2008 General Manager, Accounting Department, Administration Division Feb 2016 General Manager, Corporate Planning Department, Business Strategy Division Nov 2018 General Manager, Legal Department, Administration Division Feb 2020 General Manager, Legal & Compliance Department, Administration Division Jun 2020 Executive Officer; General Manager, Legal & Compliance Department, Administration Division Jun 2024 Executive Officer; in charge of special matters for the President Jun 2024 Full-time Statutory Auditor (current)

Apr 1986 Joined the Company Feb 2006 General Manager, Packaging Materials Business Department, 1st Business Division Oct 2009 General Manager, Resin Business Department, 1st Business Division Jan 2011 General Manager, Industrial Materials Business Department, 2nd Business Division Apr 2014 General Manager, Functional Foam Business Department, 2nd Business Division Feb 2017 General Manager, Planning Department, 2nd Business Division Jan 2019 Managing Director, Sekisui Plastics Europe GmbH (now SKP Germany GmbH) Jun 2019 Executive Officer of the Company; Managing Director, Proseat Europe GmbH (now SKP Germany GmbH); Representative Director, Sekisui Plastics Europe B.V. (now Sekisui Kasei Europe B.V.) Jan 2023 Executive Officer; Deputy General Manager, Corporate Strategy Division May 2025 Executive Officer; in charge of special matters for the President Jun 2025 Full-time Statutory Auditor (current)

Apr 1970 Registered as Attorney-at-Law; joined Irokawa Law Office Jan 2001 Representative, Irokawa Law Office Mar 2009 Outside Director, Sumitomo Rubber Industries, Ltd. Jun 2012 Outside Statutory Auditor of the Company (current) Jun 2016 Outside Statutory Auditor, Techno Associe Co., Ltd. Jan 2017 Counsel, Irokawa Law Office Jan 2020 Representative, Irokawa Law Office (concurrent, current) Jun 2020 Outside Statutory Auditor, Seiren Co., Ltd. (concurrent, current)

Apr 1983 Joined Dai-ichi Life Insurance Company, Limited Apr 2004 General Manager, Revenue Management Department, Dai-ichi Life Insurance Company, Limited Apr 2010 General Manager, Finance Department, Dai-ichi Life Insurance Company, Limited Jun 2012 Standing Statutory Auditor, Dai-ichi Life Insurance Company, Limited Oct 2016 Director (Full-time Audit and Supervisory Committee Member), Dai-ichi Life Holdings, Inc. (now Dai-ichi Life Group, Inc.) Jun 2020 Outside Statutory Auditor, Aida Engineering, Ltd. (concurrent, current) Jun 2025 Outside Statutory Auditor of the Company (current)

Nov 1981 Joined Price Waterhouse (now PricewaterhouseCoopers) Mar 1987 Registered as Certified Public Accountant Mar 1999 Passed U.S. Certified Public Accountant examination Apr 2000 Opened Hideo Yoshii Certified Public Accountant Office; Representative (concurrent, current) May 2006 Registered as Certified Tax Accountant Jun 2009 Outside Statutory Auditor, Kota Co., Ltd. Jun 2015 Outside Statutory Auditor, Techno Associe Co., Ltd. Jun 2025 Outside Statutory Auditor of the Company (current)