Apr 1987 Joined Mitsui Construction Co., Ltd. (now Sumitomo Mitsui Construction Co., Ltd.) Apr 2000 Joined the Company; Construction Team, Civil Works Department, Tohoku Branch Jan 2017 Team Leader, Construction Team, Construction Department, Civil Works Division, the Company Apr 2018 Director, Vice President and Executive Officer, Nippon Kyoryo Corporation Apr 2021 Head of Construction Department, Civil Works Division, the Company Apr 2022 Head of Civil Works Division, the Company Jun 2022 Director and Executive Officer, Head of Civil Works Division, the Company Jun 2023 Managing Executive Officer, Head of Civil Works Division, the Company Apr 2025 Managing Executive Officer, Head of Corporate Planning Department, the Company Jun 2025 Director and Managing Executive Officer, Head of Corporate Planning Department, the Company Apr 2026 Representative Director, President, the Company (current)

Apr 1983 Joined Oriental Concrete Co., Ltd. (now the Company) Feb 2010 Director, Managing Executive Officer, Head of Construction and Technology Division, the Company Jun 2012 Director, OSJB Holdings Corporation Jun 2015 Director, Senior Managing Executive Officer, Head of Construction and Technology Division, the Company Apr 2016 Director, Senior Managing Executive Officer, Head of Civil Works Division, the Company Apr 2017 Representative Director, President, the Company Jun 2017 Representative Director, President, OSJB Holdings Corporation Apr 2025 Representative Director, President, Head of Safety Management Division, the Company Apr 2026 Director, the Company (current)

Apr 1985 Joined Oriental Concrete Co., Ltd. (now the Company) Jan 2010 General Manager, Technology Department, Construction and Technology Division, the Company Mar 2010 Executive Officer, General Manager, Technology Department, Construction and Technology Division, the Company Jun 2015 Managing Executive Officer, General Manager, Technology Department, Construction and Technology Division, the Company Apr 2016 Managing Executive Officer, General Manager, Technology Department, Civil Works Division, the Company Apr 2017 Managing Executive Officer, Head of Technology Division, the Company Jun 2017 Director, Managing Executive Officer, Head of Technology Division, the Company Apr 2019 Director, Managing Executive Officer, Head of Technology Division, in charge of Information Systems, the Company Jun 2019 Director, Technology Division, OSJB Holdings Corporation Jan 2021 Director, Managing Executive Officer, Head of Technology Division, in charge of Information Systems; Head of Eastern Japan Business Reform Promotion Department, Technology Division, the Company Jun 2024 Director, Senior Managing Executive Officer, Head of Technology Division, in charge of Information Systems; Head of Eastern Japan Business Reform Promotion Department, Technology Division, the Company Aug 2024 Director, Senior Managing Executive Officer, Head of Technology Division, in charge of Information Systems; Head of Eastern Japan Business Reform Promotion Department, Technology Division; Head of Innovation Division, the Company Apr 2026 Director, Senior Managing Executive Officer, Head of Technology Division, in charge of Information Systems; Head of Business Reform Promotion Department, Technology Division; Head of Innovation Division, the Company (current)

Apr 1985 Joined The Sanwa Bank, Limited (now MUFG Bank, Ltd.) Apr 2007 General Manager, Market Operations Department, China, MUFG Bank, Ltd. Oct 2009 Manager, Securities Sales Office, Market Sales Department, MUFG Bank, Ltd. Jun 2011 General Manager, Market Sales Department, MUFG Bank, Ltd. Jun 2014 Director, Executive Officer, in charge of Corporate Planning, the Company Jun 2015 Director, in charge of Corporate Planning, OSJB Holdings Corporation Apr 2017 Director, Executive Officer, in charge of Corporate Planning and Safety, Quality and Environment, the Company Apr 2018 Director, Executive Officer, Head of Administration Division, in charge of Corporate Planning and Safety, Quality and Environment, the Company Jun 2019 Director, in charge of Internal Control, Corporate Planning, Administration and Compliance, OSJB Holdings Corporation Apr 2021 Director, Executive Officer, Head of Administration Division, in charge of Corporate Planning, Safety, Quality and Environment, and Legal and Compliance, the Company Jun 2024 Director, Managing Executive Officer, Head of Administration Division, in charge of Safety, Quality and Environment, and Legal and Compliance, the Company Apr 2025 Director, Managing Executive Officer, Head of Administration Division, in charge of Legal and Compliance, the Company Apr 2026 Director, Managing Executive Officer, Head of Administration Division, in charge of Legal and Compliance and Corporate Planning, the Company Jun 2026 Director, Managing Executive Officer, Head of Administration Division, in charge of Legal and Compliance, the Company (current)

Apr 1985 Joined Shiraishi Corporation (now the Company) Apr 2005 General Manager, Sapporo Branch, the Company Oct 2007 Head of Hokkaido Branch, Tokyo Branch, the Company Jun 2011 Sales Team Leader, Sales Department, Tokyo Branch, the Company Feb 2015 General Manager, Sales Department, Tokyo Branch, the Company Apr 2016 Deputy General Manager and General Manager, Sales Department, Tokyo Branch, the Company Jun 2017 Executive Officer, Deputy General Manager and General Manager, Sales Department, Tokyo Branch, the Company Apr 2021 Executive Officer, General Manager, Tokyo Branch, the Company Jun 2022 Director, Executive Officer, General Manager, Tokyo Branch, the Company Apr 2023 Director, Executive Officer, Head of Sales Division, the Company Jun 2023 Director, Executive Officer, Head of Sales Division, in charge of Building Construction, the Company Jun 2024 Director, Managing Executive Officer, Head of Sales Division; General Manager, Sales Planning Department, Sales Division; in charge of Building Construction, the Company Apr 2025 Director, Managing Executive Officer, Head of Sales Division, in charge of Building Construction, the Company (current)

Apr 1976 Joined Nichimen & Iwai Corporation (now Sojitz Corporation) Apr 2005 President and General Manager, Bangkok Branch, Sojitz Thailand Co., Ltd. Apr 2007 General Manager, Synthetic Resins Division, Sojitz Corporation Apr 2007 President, Sojitz Planet Corporation Apr 2009 Executive Officer, General Manager, Functional Materials Division, Sojitz Corporation Apr 2012 Managing Executive Officer, Head of Lifestyle Industries Group, Sojitz Corporation Oct 2013 Managing Executive Officer, Head of Consumer Services and Development & Construction Division, Sojitz Corporation Apr 2014 Managing Executive Officer, General Manager, Asia and Oceania, Sojitz Corporation Apr 2017 Chairman, Sojitz Planet Corporation Jun 2017 Director, OSJB Holdings Corporation Apr 2019 Advisor, Sojitz Planet Corporation Apr 2021 Director, the Company (current)

Sep 2007 Registered as attorney-at-law; joined Toranomon Law and Economics Office Jan 2013 Attorney-at-law, Ginza PLUS Law Office Jun 2017 Director, OSJB Holdings Corporation Apr 2021 Director, the Company (current) Jul 2024 Attorney-at-law, Suzuki Kazuo & Kiho Law Office (current)

Mar 1977 Joined Aica Kogyo Company, Limited Apr 2002 Head of Metropolitan Area Sales Group No. 1, Aica Kogyo Company, Limited Jun 2004 Director, Senior Executive Officer, President of Chemical Products Company, Aica Kogyo Company, Limited Oct 2006 Director, Senior Executive Officer, Head of Metropolitan Area Sales Group No. 1 and Tokyo Branch, Aica Kogyo Company, Limited Jul 2008 Managing Director, President of Building Materials Company, Aica Kogyo Company, Limited Jul 2009 Managing Director, in charge of Market Development, Aica Kogyo Company, Limited Oct 2010 Managing Director, in charge of Overseas Business, Aica Kogyo Company, Limited Apr 2013 Managing Director, General Manager, General Planning Department, Aica Kogyo Company, Limited Apr 2014 Managing Director, Assistant to the President, in charge of Special Projects, Aica Kogyo Company, Limited Jun 2014 Audit & Supervisory Board Member, Aica Kogyo Company, Limited Jun 2018 Advisor, Aica Kogyo Company, Limited Jun 2020 Director, OSJB Holdings Corporation Apr 2021 Director, the Company (current)

Apr 1988 Joined The Mainichi Newspapers Co., Ltd. Apr 2006 Chief, Kofu Bureau, Mainichi Newspapers Co., Ltd. Apr 2017 General Manager, Digital Media Bureau, Mainichi Newspapers Co., Ltd. Jun 2018 General Manager, Second Sales Division, Mainichi Newspapers Co., Ltd.; Director, Mainichi Advertising Co., Ltd. Jun 2020 Head of Tokyo Head Office Representative Office, Mainichi Newspapers Co., Ltd. Jun 2021 Outside Director, Kobelco Eco-Solutions Co., Ltd. Jun 2022 Advisor, Kobelco Eco-Solutions Co., Ltd. (current) Jun 2022 Outside Director, Osue Corporation (current) Jun 2023 Director, the Company (current)

Apr 1985 Joined Oriental Concrete Co., Ltd. (now the Company) Aug 2010 General Manager, General Affairs Department, Nagoya Branch, the Company Jun 2016 General Manager, Administration Department, Osaka Branch, the Company Mar 2018 General Manager, Administration Department, Tohoku Branch, the Company Apr 2019 General Manager, Legal and Compliance Office, the Company Jun 2025 Director, Audit and Supervisory Committee Member (Full-time), the Company (current)

Apr 1995 Joined Musashino Bank, Ltd. Dec 2007 Joined Deloitte Touche Tohmatsu (Tohmatsu Audit Corporation) Jul 2009 Registered as Certified Public Accountant Oct 2009 Joined Deloitte Tohmatsu Financial Advisory LLC Sep 2016 Registered as Certified Tax Accountant Oct 2016 Representative Member, Value Advisory LLC (current) Jun 2020 Director, Audit and Supervisory Committee Member, OSJB Holdings Corporation Apr 2021 Director, Audit and Supervisory Committee Member, the Company (current)

Nov 2005 Judge, Sendai District Court Apr 2009 Judge, Tachikawa Branch, Tokyo District Court Aug 2010 Joined Breakmore Law Office Jun 2014 Joined EY Law Japan Oct 2017 Attorney-at-law, DT Law Corporation (current) Jun 2020 Director, Audit and Supervisory Committee Member, OSJB Holdings Corporation Apr 2021 Director, Audit and Supervisory Committee Member, the Company (current)