Apr 1988 Joined the Company Apr 2011 Officer; Director, Tokyo Office; General Manager, Kanto Region, Gas Business Division; General Manager, Kanagawa Plant; Manager, Haneda Sales Office; Manager, Tama Branch Office Jun 2011 Director Jun 2012 Representative Director, President, Toyo Koatsu Gas Co., Ltd. Jun 2012 Representative Director, President, Niigata Koatsu Gas Co., Ltd. Jun 2012 Representative Director, Maru Sho Gas Co., Ltd. Jun 2012 Representative Director, Chairman, Yumiyama Co., Ltd. Jun 2015 Managing Director Jun 2017 Senior Managing Director Jul 2020 Representative Director, Chairman, KGK Service Co., Ltd. Jun 2021 Representative Director, Chairman, Koatsu Showa Bombe Co., Ltd. Jun 2021 Representative Director, President; President Executive Officer (current) Jun 2023 Representative Director, KGK Service Co., Ltd.

Apr 1988 Joined the Company Apr 2007 Deputy General Manager, Chemical Products Business Division; General Manager, Western Chemical Products Department Jun 2009 Executive Officer; Deputy General Manager, Chemical Products Business Division; General Manager, Western Chemical Products Department Apr 2010 Executive Officer; General Manager, Chemical Products Business Division Jun 2011 Director Jun 2015 Managing Director Jun 2017 Senior Managing Director Jun 2017 Representative Director, Chairman and President, KOATSU GAS KOGYO VIETNAM CO., LTD. (current) Jun 2021 Representative Director, Executive Vice President; Executive Vice President Executive Officer (current) Jan 2024 Representative Director, Suzuka Fine Co., Ltd. (current) Jun 2025 Representative Director, Chairman, KOATSU GAS KOGYO VIETNAM CO., LTD. (current)

Apr 1986 Joined the Company Jun 2013 Executive Officer; General Manager, Tokai Region, Gas Business Division Jun 2015 Director Jun 2020 Managing Director Jun 2021 Senior Executive Officer; General Manager, Corporate Planning Division; General Manager, Corporate Planning Department; General Manager, Gas Business Division Jun 2023 Director, Senior Executive Officer (current)

Apr 1989 Joined the Company Apr 2013 Officer; seconded to Suzuka Fine Co., Ltd. Jul 2013 Officer; General Manager, General Affairs Department, Administration Division, Tokyo Office Apr 2015 Officer; Deputy Manager, Tokyo Office; General Manager, General Affairs Department, Administration Division, Tokyo Office Apr 2017 Officer; General Manager, Corporate Planning Department, Corporate Planning Division Jun 2018 Director Jun 2021 Managing Executive Officer; General Manager, Administration Division Jun 2023 Director, Managing Executive Officer Jun 2026 Director, Senior Managing Executive Officer (current)

Apr 1980 Joined Denki Kagaku Kogyo K.K. (now Denka Company Limited) Apr 2011 Executive Officer, Denka Company Limited Apr 2014 Managing Executive Officer, Denka Company Limited Jun 2016 Director and Managing Executive Officer, Denka Company Limited Apr 2019 Representative Director, President, Akuros Shoji Co., Ltd. (now YK Across Co., Ltd.) Jun 2025 Director of the Company (current)

Apr 1985 Joined the Company Apr 2011 Officer; General Manager, General Affairs Department, Administration Division, Tokyo Office Jun 2011 Executive Officer; General Manager, Administration Division, Tokyo Office Jun 2013 Executive Officer; Deputy General Manager, Administration Division; General Manager, Finance Department Jun 2015 Director; General Manager, Administration Division Jun 2017 Managing Director; General Manager, Administration Division Jun 2018 Full-time Audit & Supervisory Board Member Jun 2021 Director (Full-time Audit and Supervisory Committee Member) (current)

Apr 1987 Registered as attorney, Kyoto Bar Association Apr 1990 Opened Yamamura Tadao Law Office Apr 2003 Vice President, Kyoto Bar Association Apr 2004 Family Court Mediation Commissioner, Kyoto Family Court Oct 2016 Member, Kyoto Prefectural Information Disclosure Review Board Jun 2019 Director of the Company Jun 2021 Director (Audit and Supervisory Committee Member) (current)

Oct 2000 Joined Osaka Office of Tohmatsu & Co. (now Deloitte Touche Tohmatsu LLC) Apr 2004 Registered as Certified Public Accountant Aug 2010 Registered as Certified Tax Accountant Oct 2010 Resigned from Deloitte Touche Tohmatsu LLC Oct 2010 Opened Nagashima Certified Public Accountant Office Oct 2012 Established Nagashima Consulting Co., Ltd. Apr 2017 Accounting Advisor to the Company Mar 2019 Ended role as Accounting Advisor to the Company Jun 2019 Audit & Supervisory Board Member of the Company Jun 2021 Director (Audit and Supervisory Committee Member) (current)

Oct 2003 Registered as attorney, Hyogo Bar Association Oct 2003 Joined Sakamoto Toyoki Law Office (now Kobe Partners Law Office) Apr 2018 Member, Kobe City Real Estate Review Board Nov 2020 Member, Hyogo Prefectural Information Disclosure and Personal Information Protection Review Council (current) Jun 2021 Director, Japan Federation of Bar Associations Jun 2022 Outside Audit & Supervisory Board Member, TOA Corporation (current) Jun 2024 Director (Audit and Supervisory Committee Member) (current)