Apr 1986 Joined Toyo Soda Manufacturing Co., Ltd. (now Tosoh Corporation) Jun 2010 General Manager, Polyethylene Department, Polymer Business Division, Tosoh Corporation Jun 2015 Representative Director, President, Sankyo Kasei Kogyo Co., Ltd. Jun 2019 Executive Officer, General Manager, Polymer Business Division, Tosoh Corporation Jun 2023 Representative Director, President and Executive Officer, the Company (current)

Apr 1989 Joined Tosoh Corporation Jun 2009 General Manager, Public Relations Office and Compliance Committee, Tosoh Corporation Jun 2013 General Manager, Planning and Management Office, Polymer Business Division, Tosoh Corporation Jun 2020 Director and Executive Officer, the Company; in charge of Corporate Management Department, Information Systems Department and Purchasing Department May 2025 Executive Officer, Tosoh Corporation Jun 2025 Director, Managing Executive Officer, the Company; in charge of Quality Assurance Department, Corporate Management Department, Information Systems Department and Purchasing Department (current)

Apr 1986 Joined The Industrial Bank of Japan, Ltd. Apr 2013 Senior Executive, Asset Management Group, Mizuho Securities Co., Ltd. Jun 2017 Advisor, the Company Jun 2017 Director and Managing Executive Officer, the Company; in charge of Human Resources and General Affairs Department, Accounting Department and Internal Audit Office Jun 2019 Director, Managing Executive Officer, the Company; in charge of Human Resources and General Affairs Department, Accounting Department, Internal Audit Office and Waterproofing Business Division Jun 2026 Director, Managing Executive Officer, the Company; in charge of Human Resources and General Affairs Department, Accounting Department, Internal Audit Office, CSR Promotion Office and Estate Business Office (current)

Apr 1989 Joined Tosoh Corporation Jun 2013 General Manager, Polymer Production Department, Yokkaichi Works, Tosoh Corporation May 2023 Executive Officer, Tosoh Corporation Jun 2023 General Manager, Tosoh (Ruian) Polyurethane Co., Ltd. Jun 2026 Director, Managing Executive Officer, Tsuchiura Works Manager, the Company

Apr 1983 Joined Onoda Cement Co., Ltd. (now Taiheiyo Cement Corporation) Apr 2006 General Manager, Production Department, Kumagaya Plant, Taiheiyo Cement Corporation Apr 2013 Plant Manager, Ofunato Plant, Taiheiyo Cement Corporation Apr 2018 Executive Officer, Overseas Business Division; Head, Vietnam Representative Office, and President, Gisong Cement Jun 2021 Representative Director, President, Onoda Chemical Co., Ltd. Jun 2025 Advisor, Onoda Chemical Co., Ltd. (current) Jun 2026 Director, the Company

Apr 1988 Joined the Company Jun 2014 General Manager, Supply and Demand Management Department, Tsuchiura Works Jun 2021 General Manager, Internal Audit Office Jun 2026 Director, Full-time Audit and Supervisory Committee Member, the Company

Apr 1982 Joined Denki Kagaku Kogyo K.K. (now Denka Company Limited) Jun 2004 General Manager, Polymer Research Center No. 1 Research Department, Chiba Plant, Denka Company Limited Apr 2013 Plant Manager, Ofunato Plant, Denka Company Limited Apr 2015 Executive Officer, Deputy Plant Manager, Aoumi Plant, Denka Company Limited Apr 2019 Managing Executive Officer, Plant Manager, Chiba Plant, Denka Company Limited Apr 2022 Advisor, Denka Company Limited Jun 2022 Director, Audit and Supervisory Committee Member, the Company (current)

Apr 1986 Joined Toyo Soda Manufacturing Co., Ltd. (now Tosoh Corporation) Jun 2011 General Manager, Management Office, Advanced Materials Business Division, Tosoh Corporation Jun 2013 General Manager, Finance Department, Tosoh Corporation Jun 2015 Outside Audit & Supervisory Board Member, the Company Jun 2017 Executive Officer, General Manager, Finance Department, Tosoh Corporation Jun 2018 Executive Officer, General Manager, Management Office, Tosoh Corporation Jun 2020 Senior Executive Officer, General Manager, Management Office, and Chief Representative for China, Tosoh Corporation Jun 2022 Director, Managing Executive Officer, General Manager, Management Office, Tosoh Corporation Jun 2023 Full-time Audit & Supervisory Board Member, Tosoh Corporation (current) Jun 2023 Director, Audit and Supervisory Committee Member, the Company (current)