IRPC Annual Report 2023

Director and Executive Development IRPC encourages its directors and executive officers to attend training programs that are beneficial to the performance of their duties, enabling them to familiarize themselves with the company’s management style, industry overview and roles and responsibilities of a director. Every director has attended the orientation (for further details, please refer to Directors’ Biographies, Page 26-42) In addition, in 2023 The company made arrangements for directors and executives to attended relevant training sessions as follows: 1) M.D. Korn Pongjittham, Director of the company attended training courses provided by the Thai Institute of Directors Association (IOD): Director Accreditation Program (DAP), Class 205/2023; Advanced Audit Committee (AACP), Class 49/2023; Financial Statements for Directors (FSD), Class 49/2023; and Director Certification Program (DCP), Class 347/2023. 2) Miss Piangpanor Boonklam, Committee, joined “The Cullinan: The Making of the Digital Board” Class 2 organized by Thailand Management Association (TMA). 3) Special lecture by the Petroleum Institute of Thailand: Management perspective on five key risk factors that may lead to “Poly-Crisis,” The WHAT’s and WHY’s of Petroleum and Petrochemical for Board of Directors, Management and Executives to Guide their Business Decision, and the Framework of the Petrochemical Industry Development, Phase 4 in the Eastern Seaboard and areas with potential for future economic development. 4) Training courses on Subsidiary Governance Program: SGP by the Thai Institute of Directors Association (IOD) for senior executives/executives who hold the positions of directors of the company/ managing directors/those who serve in an IRPC’s subsidiary company to gain knowledge and understanding of corporate governance approach for IRPC’s subsidiaries, roles, duties and legal responsibilities of directors, and stakeholder expectation, in order to effectively manage risks and perform their duties. 3. Board and Chief Executive Office and President Performance Evaluation Board Performance Evaluation The Board of Directors has determined that the Board performance evaluation is conducted on annual basis so that the Board may review its performance, issues and obstacles over the past year. The assessment results and recommendations will be presented to the Board of Directors for use as input to set guidelines to improve Board effectiveness in a concrete manner. In 2023, IRPC developed an evaluation form according to the standards for corporate governance of the Stock Exchange of Thailand, ASEAN CG Scorecard, and anti-corruption oversight as recommended by the Thai Institute of Directors Association (IOD), as follows: 1. Performance evaluation form for the entire Board of Directors 2. Self-evaluation form for individual directors 3. Peer-based performance evaluation form for directors (cross-evaluation, one-on-one) 4. Board’s committee performance evaluation form 5. Evaluation form for the Board with regard to anti-corruption oversight 6. Evaluation form for the effectiveness of Board meeting preparation (Company Secretary performance evaluation) 254 Report on Key Corporate Governance Activities IRPC Public Company Limited

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