Head of Internal Audit and Head of Corporate Compliance (1) Head of Internal Audit The Audit Committee Meeting No. 8/2017 convened on September 18, 2017 resolved to approve the appointment of Mr. Amorn Putiphrawan as Senior Vice President – Internal Audit, effective January 1, 2018. As Mr. Amorn Putiphrawan retired in December 2023, the Committee resolved at the Audit Committee Meeting (special meeting) No. 1/2023 convened on September 17, 2023 to appoint Mr. Chatchawalit Dhammasaroj as Senior Vice President – Internal Audit, effective January 1, 2024, to be responsible for evaluating and enhancing internal control effectiveness, supervising the operations of the internal audit function to be in accordance with the objectives and international standards, providing objective and independent consultation on the Company’s operations, and reporting directly to the Audit Committee. Attachment 3 Details of the Heads of the Internal Audit and Compliance Units Name - Surname Age Appointed Education Training : Mr. Amorn Putiphrawan Senior Vice President - Internal Audit : 60 Years : 1 January 2018 : Master of Engineering (Chemical Engineering), Chulalongkorn University : Bachelor of Science (Fuel Technology), Chulalongkorn University : Leadership Development Program (LDP 1) & (LDP 2), PTT Leadership and Learning Institute : Subsidiary Governance and Business and Legal Issues for Directors and Executives 2022, Director’s Legal Liabilities, Ethical Leadership for New Era and High Performing Board & Board Effectiveness 2021 (In-house Programs by GC), Thai Institute of Directors Association (IOD) Board Member / Management in Listed Company - The Stock Exchange of Thailand : 1 : Senior Vice President - Internal Audit, PTT Global Chemical Public Company Limited Board Member / Management in Non-Listed Company - The Stock Exchange of Thailand : None Position in Other Organizations / Institutions : None Work Experiences (5-year past experiences) 1 Oct 2017 - 31 Dec 2017 Vice President reporting to Chief Executive Officer and President, PTT Global Chemical Public Company Limited 16 Jun 2014 - 30 Sep 2017 Vice President - Corporate Risk Management and Internal Control System, PTT Global Chemical Public Company Limited Shareholding : None Relation among Family with Other Directors, Management, Major Shareholders of the Company or Subsidiaries : None 398
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