Apr 1980 Joined Idemitsu Kosan Apr 2005 General Manager, Human Resources Department, Idemitsu Kosan Jul 2008 General Manager, Accounting Department, Idemitsu Kosan Jun 2011 General Manager, Accounting Department, Idemitsu Kosan; Executive Officer Jun 2013 Director and Managing Executive Officer, General Manager, Accounting Department, Idemitsu Kosan Jun 2014 Managing Director, Idemitsu Kosan Jun 2017 Director and Executive Vice President, Idemitsu Kosan Apr 2018 Representative Director, President, Idemitsu Kosan Apr 2019 Representative Director, President, President Executive Officer, Idemitsu Kosan Jun 2022 Representative Director, President, President Executive Officer and CEO, Idemitsu Kosan Sep 2022 Chairman, Petroleum Association of Japan (current) Apr 2025 Representative Director, Chairman, Chief Executive Officer, Idemitsu Kosan Jun 2026 Director, Chairman of the Board of Directors, Idemitsu Kosan (current)

Apr 1985 Joined Idemitsu Kosan Jul 2010 Deputy General Manager, Tokuyama Refinery, Idemitsu Kosan; concurrently Deputy Plant Manager, Tokuyama Plant Jul 2012 Deputy General Manager, Human Resources Department, Idemitsu Kosan; concurrently Chairman, Health Insurance Society; Chairman, Corporate Pension Fund Jul 2015 Deputy General Manager, Accounting Department, Idemitsu Kosan Jun 2017 General Manager, Accounting Department, Idemitsu Kosan Jul 2018 Executive Officer, General Manager, Accounting Department, Idemitsu Kosan Apr 2019 Executive Officer, General Manager, Finance Department, Idemitsu Kosan Jul 2020 Senior Executive Officer, Chief Financial Officer, Idemitsu Kosan Jun 2021 Director and Managing Executive Officer, Idemitsu Kosan Jun 2022 Director and Executive Vice President Executive Officer, Idemitsu Kosan Jun 2023 Representative Director and Executive Vice President Executive Officer, Idemitsu Kosan Apr 2025 Representative Director, President, President Executive Officer, Idemitsu Kosan Jun 2026 Representative Director, President, President Executive Officer and CEO, Idemitsu Kosan (current)

Apr 1985 Joined Showa Shell Sekiyu K.K. Sep 2002 Shizuoka Area Manager, Showa Shell Sekiyu K.K. Sep 2004 General Manager, Sales Planning Department, Showa Shell Sekiyu K.K. Mar 2005 Executive Officer, General Manager, Sales Planning Department; concurrently General Manager, Retail Sales Department, Showa Shell Sekiyu K.K. Mar 2006 Director, Showa Shell Sekiyu K.K. Mar 2009 Managing Executive Officer, Showa Shell Sekiyu K.K. Mar 2013 Senior Managing Executive Officer, Showa Shell Sekiyu K.K. Jul 2014 Representative Director, President, Solar Frontier K.K. Apr 2019 Managing Executive Officer, Idemitsu Kosan Jun 2020 Director and Managing Executive Officer, Idemitsu Kosan Jun 2022 Director and Executive Vice President Executive Officer, Idemitsu Kosan Jun 2023 Representative Director and Executive Vice President Executive Officer, Idemitsu Kosan Jun 2026 Representative Director and Executive Vice President Executive Officer, COO, Idemitsu Kosan (current)

Apr 1990 Joined Idemitsu Kosan Apr 2013 Deputy General Manager, Gas Business Office, Idemitsu Kosan Jun 2017 General Manager, Production Technology Center, Idemitsu Kosan Apr 2019 Executive Officer, Plant Manager, Hokkaido Refinery, Idemitsu Kosan Jun 2021 Senior Executive Officer, in charge of Manufacturing Technology, Idemitsu Kosan Jun 2022 Director and Managing Executive Officer, Idemitsu Kosan Jun 2024 Director and Executive Vice President Executive Officer, Idemitsu Kosan Jun 2025 Representative Director and Executive Vice President Executive Officer, Idemitsu Kosan Jun 2026 Representative Director and Executive Vice President Executive Officer, CSO, Idemitsu Kosan (current)

Apr 1990 Joined Showa Shell Sekiyu K.K. Sep 2008 General Manager, Finance Department, Showa Shell Sekiyu K.K. Apr 2009 General Manager, Sales Planning Department, Showa Shell Sekiyu K.K. Apr 2011 General Manager, Chugoku Branch, Showa Shell Sekiyu K.K. Mar 2013 Executive Officer, General Manager, Chubu Branch, Showa Shell Sekiyu K.K. Mar 2015 Executive Officer, General Manager, Accounting and Finance Division, Showa Shell Sekiyu K.K. Mar 2018 Managing Executive Officer, CFO, in charge of Public Relations, Accounting, Finance and Financial Risk Management, Showa Shell Sekiyu K.K. Apr 2019 Senior Executive Officer, in charge of Procurement; concurrently General Manager, Accounting Department, Idemitsu Kosan Jul 2021 Advisor, President, Idemitsu Asia Pte. Ltd., Idemitsu Kosan Jul 2024 Senior Executive Officer, General Manager, Accounting and Finance Department, Idemitsu Kosan Jul 2025 Managing Executive Officer, CFO, in charge of Financial Strategy, Idemitsu Kosan Jun 2026 Director and Managing Executive Officer, CFO, Idemitsu Kosan (current)

Apr 1991 Joined Idemitsu Kosan Apr 2019 Deputy General Manager, Retail Marketing Department, Idemitsu Kosan Jul 2021 President, Representative Director, Idemitsu Retail Sales Co., Ltd. Apr 2023 General Manager, Human Resources Department, Idemitsu Kosan Jul 2024 Executive Officer, General Manager, Human Resources Department, Idemitsu Kosan Jul 2025 Senior Executive Officer, in charge of Human Resources; concurrently General Manager, Human Resources Department, Idemitsu Kosan Jun 2026 Director and Managing Executive Officer, CHRO, Idemitsu Kosan (current)

Apr 2010 Councilor, Idemitsu Museum of Arts (Public Interest Foundation) (current); Councilor, Idemitsu Culture and Welfare Foundation (Public Interest Foundation) Dec 2015 Vice President and Director, Nisshō Kōsan Co., Ltd. Apr 2016 President, Representative Director, Nisshō Kōsan Co., Ltd. (current) Apr 2019 Director, Idemitsu Kosan (current); President, Representative Director, Seiwa Kōsan Co., Ltd. (current) Apr 2020 President, Representative Director, MI Power Co., Ltd. (current) Oct 2020 Representative Director, Idemitsu Philosophy Research Institute (General Incorporated Association) (current) Apr 2021 Representative Director, Idemitsu Kosan History and Philosophy Research Institute (General Incorporated Association) (current) Aug 2024 President, Representative Director, Zen Co., Ltd. (current) Aug 2024 President, Representative Director, En Co., Ltd. (current) Aug 2025 Director, Power Consulting Networks Inc. (current) Aug 2025 President and Representative Director, Kona Aquaculture Inc. (current)

Apr 1983 Joined Teijin Limited Apr 2011 Chief Representative for Europe, Teijin Group, Teijin Limited Apr 2012 Executive Officer, Teijin Group, Teijin Limited Apr 2013 Managing Executive Officer, Teijin Group, Teijin Limited Jun 2013 Director and Managing Executive Officer, Teijin Limited Apr 2014 Representative Director, President and Executive Officer, CEO, Teijin Limited Apr 2022 Chairman of the Board, Teijin Limited Jun 2022 Outside Director, Midori-kai Co., Ltd. (current) Jun 2023 Senior Advisor, Teijin Limited (current); Outside Director, MS&AD Insurance Group Holdings, Inc. (current) Jun 2023 Director, Idemitsu Kosan (current)

Apr 2000 Joined Deloitte Tohmatsu Consulting Co., Ltd. Jun 2004 Joined Tohato Co., Ltd. Jan 2007 Joined Unison Capital Inc. Sep 2009 Joined Innovation Network Corporation of Japan (currently INCJ, Ltd.) Sep 2014 Joined Yanmar Holdings Co., Ltd. Jan 2015 Executive Officer, General Manager, Marine Pleasure Business Division, Yanmar Co., Ltd. Jun 2020 Director, Chief Strategy Officer, Yanmar Holdings Co., Ltd. Apr 2024 Director, Yanmar Holdings Co., Ltd. Jun 2024 Outside Director, NEC Corporation; Director, Idemitsu Kosan (current) Apr 2026 Executive Officer, Corporate EVP, CHRO, and Head of People & Culture, NEC Corporation (current)

Apr 1990 Joined Showa Shell Sekiyu K.K. Apr 2009 General Manager, New Business Promotion Department, Showa Shell Sekiyu K.K.; concurrently seconded to Industry-Academia Collaboration Organization Mar 2012 General Manager, Overseas Intellectual Property Strategy Office, Showa Shell Sekiyu K.K. Oct 2014 General Manager, Product Development Department, Atsugi Research Center, Technology Division, Solar Frontier K.K. Apr 2016 General Manager, Sales Planning Department, Showa Shell Sekiyu K.K. Apr 2017 General Manager, Energy Solutions Business Division, Showa Shell Sekiyu K.K. Apr 2019 General Manager, Public Relations Department, Idemitsu Kosan Jul 2021 Executive Officer, General Manager, Public Relations Department, Idemitsu Kosan Mar 2023 Executive Officer, General Manager, Functional Pavement Materials Business Division, Advanced Materials Company, Idemitsu Kosan Jun 2025 Audit & Supervisory Board Member, Idemitsu Kosan (current)

Apr 1988 Joined Idemitsu Kosan Jul 2010 Group Leader, SPS and PPS Group, Functional Materials Department, Idemitsu Kosan Dec 2015 Deputy General Manager, Accounting Department, Idemitsu Kosan Apr 2019 Deputy General Manager, Finance Department, Idemitsu Kosan Jul 2020 General Manager, Finance Department, Idemitsu Kosan Jul 2022 Executive Officer, General Manager, Accounting and Finance Department, Idemitsu Kosan Jul 2024 Executive Officer, in charge of Business Investment; concurrently General Manager, Business Investment Office, Idemitsu Kosan Jul 2025 Executive Officer, in charge of Business Investment Promotion; concurrently General Manager, Business Investment Office, Idemitsu Kosan Jun 2026 Audit & Supervisory Board Member, Idemitsu Kosan (current)

Dec 2008 Registered as attorney-at-law; established Kuhoudou Law Office (current) Apr 2010 Member, Tokyo Third Third-Party Committee on Pension Record Verification, Ministry of Internal Affairs and Communications Apr 2011 Standing Councilor, Daiichi Tokyo Bar Association Sep 2015 Auditor, General Incorporated Association for the Realization of Appropriate Prescribing of Anti-Dementia Drugs Jun 2016 Outside Audit & Supervisory Board Member, Class Technology Co., Ltd. Jul 2017 Auditor, Miyake Dental Clinic, Medical Corporation Hakueikai (current) Mar 2018 Delegate, Japan Federation of Bar Associations Apr 2018 Vice Chair, Committee on Countermeasures against Obstruction of Attorney Business, Daiichi Tokyo Bar Association Apr 2019 Director, Idemitsu Kosan (current) Aug 2025 Vice President and Director, Kona Aquaculture Inc.

Apr 1998 Joined Recruit Co., Ltd. (currently Recruit Holdings Co., Ltd.) Apr 2004 Operations Director, Recruit Advertising (Shanghai) Co., Ltd. Oct 2012 Executive Officer, General Manager, Beauty Information Division, Recruit Lifestyle Co., Ltd. Apr 2015 Executive Officer, Recruit Holdings Co., Ltd. Apr 2016 President, Representative Director, Recruit Staffing Co., Ltd. Apr 2018 SBU Executive Officer, Recruit Global Staffing B.V. (currently RGF Staffing B.V.) Apr 2019 Executive Officer, Recruit Co., Ltd.; President, Representative Director, Recruit Marketing Partners Co., Ltd. Apr 2020 Executive Officer, Recruit Holdings Co., Ltd. Apr 2025 Managing Executive Officer, Recruit Co., Ltd. (current) Jun 2025 Director, Idemitsu Kosan (current)

Apr 1994 Joined Tokyo Electric Power Company Jan 2012 Director and Chief Researcher, Institute for Global Environmental Strategies (NPO) (current) Apr 2016 Visiting Professor, University of Tsukuba Apr 2018 Visiting Professor, Kansai University Oct 2018 Co-Representative, U3 Innovations LLC (current) Jun 2019 Outside Director, Nippon Paper Trading Co., Ltd. (current) Apr 2020 Visiting Professor, Tohoku University (current) Apr 2021 Advisor, Deloitte Tohmatsu Financial Advisory LLC Jul 2022 Outside Director, Grid Inc. (current) Jun 2024 Outside Director, Nippon Steel Corporation (current) Jun 2026 Director, Idemitsu Kosan (current)

Apr 2010 Full-time Lecturer, Faculty of Economics, Seijo University Apr 2013 Associate Professor, Faculty of Economics, Seijo University Dec 2014 Temporary Member, Industrial Structure Council, Ministry of Economy, Trade and Industry Oct 2019 Temporary Member, Comprehensive Resources and Energy Survey Committee, Ministry of Economy, Trade and Industry (current) Apr 2020 Professor, Faculty of Economics, Seijo University (current) Aug 2020 Chairman, Committee on Advanced Industrial Complex Development in Yokkaichi (current) Jun 2026 Director, Idemitsu Kosan (current)

Apr 1989 Registered as attorney-at-law (Second Tokyo Bar Association); joined IBM Japan, Ltd. Dec 2007 Partner, Nozomi Sogo Law Office (current) Apr 2009 Vice President, Second Tokyo Bar Association Jun 2012 Outside Director, NEC Netsol Corporation Apr 2014 Standing Director, Japan Federation of Bar Associations May 2014 Outside Audit & Supervisory Board Member, AEON MALL Co., Ltd. Dec 2014 Outside Director and Audit and Supervisory Committee Member, Sanyo Trading Co., Ltd. Dec 2016 Outside Director and Audit and Supervisory Committee Member, FOOD & LIFE COMPANIES Ltd. Jun 2018 Outside Director, Itoham Yonekyu Holdings Inc. Mar 2020 Outside Director, ASKUL Corporation (current) Jun 2022 Outside Audit & Supervisory Board Member, Idemitsu Kosan (current) Oct 2023 Outside Director, Astemo, Ltd. (formerly Hitachi Astemo, Ltd.) (current) Jun 2025 Outside Audit & Supervisory Board Member, OMRON Corporation (current)

Oct 1986 Joined Chuo Accounting Office, Audit Corporation Mar 1990 Registered as Certified Public Accountant Jul 2002 Representative Partner, Chuo Aoyama PricewaterhouseCoopers Oct 2005 Director, same firm May 2006 Acting Chairman, same firm Oct 2007 Member of Management Committee, Deloitte Touche Tohmatsu Jul 2016 Managing Director, Japanese Institute of Certified Public Accountants Jul 2019 Chairman, Japanese Institute of Certified Public Accountants; Chairman, Accounting Education and Training Institute May 2022 Auditor, Japan Institute of Directors (General Incorporated Association) (current) Jul 2022 Senior Advisor, Japanese Institute of Certified Public Accountants (current); Member of Board of Trustees, Financial Accounting Standards Foundation Jun 2023 Outside Director (Audit and Supervisory Committee Member), Mizuho Bank, Ltd. Sep 2023 Outside Audit & Supervisory Board Member, Kagayaki Holdings Co., Ltd. (current) Jun 2024 Outside Audit & Supervisory Board Member, Idemitsu Kosan (current) Jun 2025 Outside Director, Mizuho Financial Group, Inc. (current)