GC_ONE REPORT 2021_ENG

Position in Other Organizations/Institutions : 3 • Honorary Member of the University Council, Thaksin University • President, Thammasat Association • Honorary Member of the University Council, Thammasat University Work Experiences (5-years Past Experiences) 2 Jul 2020 - 1 Jul 2021 Acting President, Thai Airways International Public Company Limited 4 Jun 2020 - 15 Jun 2021Director and Plan Administrator, Thai Airways International Public Company Limited Aug 2018 - Dec 2020 Chairman, IRPC Public Company Limited Sep 2018 - Aug 2020 Director, PTT Exploration and Production Public Company Limited Aug 2018 - May 2020 President and Chief Executive Officer/Director/Secretary to the Board, PTT Public Company Limited Jan 2018 - Aug 2018 Chief Technology and Engineering Officer, PTT Public Company Limited Dec 2017 - Aug 2018 Chairman, PTT Digital Solutions Company Limited Oct 2017 - Aug 2018 Director/Member of Risk Management Committee/ Member of Nomination and Remuneration Committee, Global Power Synergy Public Company Limited Apr 2016 - Aug 2018 Member of the Risk Management Committee, IRPC Public Company Limited Oct 2015 - Aug 2018 Director, IRPC Public Company Limited Oct 2017 - Dec 2017 Chief Operating Officer, Infrastructure and Sustainability Management Business Group, PTT Public Company Limited Apr 2017 - Dec 2017 Chairman, PTT Asahi Chemical Company Limited Nov 2015 - Dec 2017 Chairman, PTT Polymer Marketing Company Limited Jan 2016 - Sep 2017 Senior Executive Vice President, Downstream Business Group Alignment, PTT Public Company Limited Nov 2015 - Mar 2017 Chairman, PTT Polymer Logistics Company Limited Shareholding : 40,000 Shares (0.000887%) as of 31 December 2021 Relation among Family with other Directors, Management, Major Shareholders of the Company or Subsidiaries : None Mr. Chansin Treenuchagron Director (Non-executive Director) and Director to the Corporate Governance and Sustainability Committee Age : 61 Years Appointed : September 21st, 2020 Education/Training • Honorary Doctorate of Science (Technology Management), Thammasat University • Master of Economics, Chulalongkorn University • Bachelor of Economics, Thammasat University • Law of Democracy Course, Class 8/2020, Office of The Constitutional Court • Executive Development Relation, Class 1, Directorate of Civil Affairs • The Executive Program in Energy Literacy for a Sustainable Future, Class 7/2015, Thailand Energy Academy (TEA) • Diploma, National Defence College, The National Defence Course, Class 57/2014, Thailand National Defence College • Leadership Development Program III (LDP III), Class 1/2014, PTT Leadership and Learning Institute (PLLI), PTT Public Company Limited • Advance Senior Executive Program (ASEP-5), Class 5/2010, KELLOGG & SASIN, Chicago, USA • Air War College, Class 35/2006 • Senior Executive Program (SEP), Class 20, Sasin Graduate Institute of Business Administration of Chulalongkorn University • PTT Executive Leadership, General Electric, GE, New York, USA • Advanced Certificate Course in Public Economics Management for Executives, Class 10, King Prajadhipok’s Institute • Leadership Excellence through Awareness and Practice (LEAP), INSEAD, Singapore and France Director Training • IT Governance and Cyber Resilience Program (ITG) Class 18/2021, The Role of the Board in IT Governance of 2020, Briefing on International Anti-Corruption International Cases and Practices (October 14, 2015), Charted Director Class (CDC) Class 10/2015, Director Accreditation Program (DAP) Class 93/2011, Financial Statements for Directors (FSD) Class 12/2011 and Director Certification Program (DCP) Class 85/2007, Thai Institute of Directors Association (IOD) Board member/Management in Listed Company - The Stock Exchange of Thailand : 2 • Director and Member of Plan Administrator, Thai Airways International Public Company Limited • Director and Director to the Corporate Governance Committee, PTT Global Chemical Public Company Limited Board member/Management in Non-Listed Company - The Stock Exchange of Thailand : 1 • Chairman, Y.S.S. (THAILAND) Company Limited 354 PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED Form 56-1 One Report 2021

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