IRPC Annual Report 2023

Miss Siriwan Chierapong Age: 69 years Appointed Positions Independent Director/Chairman of the Risk Management Committee Date of being an Independent Director 3 April 2019 Date of being the Chairman of the Risk Management Committee 18 April 2023 Years of being an Independent Director 4 Years 8 Months Possession of IRPC shares (%) No. of share “IRPC”: - Share Possession: - % Family relationship within the Company, major shareholder or subsidiaries None Education/Training • Bachelor of Accountancy, Chulalongkorn University • Master of Business Administration (M.B.A.), Thammasat University • Senior Executive Program (SEP), Class 16, Sasin Graduate Institute of Business Administration of Chulalongkorn University • NIDA-Wharton Executive Leaders Program, The Wharton School University of Pennsylvania • PTT Executive Leadership Program, General Electric, New York, USA • Advanced Certificate Course in Public Economics Management for Executives, Class 7/2008, King Prajadhipok’s Institute • The Role of the Board in IT Governance, Year 2020, Thai Institute of Directors Association (IOD) • Director Certificate Program (DCP), Class 102/2008, Thai Institute of Directors Association (IOD) Work Experience within the past 5 years Apr. 2019 - Apr. 2023 Member of the Audit Committee, IRPC Public Company Limited 2014 - 2018 Advisor, PTT Polymer Marketing Company Limited 2013 - 2014 President, PTT Polymer Marketing Company Limited 2012 - 2013 Executive Vice President, Strategy and Portfolio Management, Corporate Strategy and Organization Development, PTT Public Company Limited 2009 - 2012 Executive Vice President, Business Development and Project Management, Petrochemicals and Refining Business Unit, PTT Public Company Limited 2005 - 2009 Executive Vice President, Subsidiary Planning and Management, Petrochemicals and Refining Business Unit, PTT Public Company Limited Current Position Board member/Management in Listed Company - The Stock Exchange of Thailand Apr. 2023 - Present Chairman of the Risk Management Committee, IRPC Public Company Limited Apr. 2019 - Present Independent Director, IRPC Public Company Limited Board member/Management in Non-Listed Company - The Stock Exchange of Thailand - None - Mr. Petai Mudtham Age: 57 Years Appointed Positions Director/Member of the Nomination and Remuneration Committee Date of being a Director 19 January 2022 Date of being the Member of the Nomination and Remuneration Committee 19 January 2022 Years of being a Director 1 Year 11 Months Possession of IRPC shares (%) No. of share “IRPC”: - Share Possession: - % Family relationship within the Company, major shareholder or subsidiaries None Education/Training • Bachelor of Economics, Ramkhamhaeng University, Bangkok, Thailand • Master of Science Program in Applied Statistics, National Institute of Development Administration, Bangkok, Thailand • Master of Science in Economics, Murray State University, USA • Inspector General Program 2021, Government Inspection Development Institute, Office of the Permanent Secretary, Prime Minister Office • Diploma, National Defence College, Class 62, Thai National Defence College • The Executive Program in Energy Literacy for a Sustainable Future, TEA 12, Thailand Energy Academy • Budgeting for Executives Program, BEP 5, Budget Bureau Personnel Development Institution, Budget Bureau • Director Certificate Program (DCP), Class 329/2022, Thai Institute of Directors Association (IOD) Work experience within the past 5 years Dec. 2020 - Jan. 2022 Acting Manager of ENCON Fund Office Oct. 2017 - Dec. 2020 Deputy Director General, Energy Policy and Planning Office Current Position Board member/Management in Listed Company - The Stock Exchange of Thailand Jan. 2022 - Present Director/Member of the Nomination and Remuneration Committee, IRPC Public Company Limited Board member/Management in Non-Listed Company - The Stock Exchange of Thailand Dec. 2020 - Present Inspector General, Ministry of Energy 28 Board of Directors, IRPC Public Company Limited IRPC Public Company Limited

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