GC One Report 2023 [EN]

Prevention of Conflicts of Interest The Board of Directors has included a policy and guidelines for considering transactions that involve or may involve a conflict of interest in the Corporate Governance and Business Code of Conduct Handbook, to which all Directors, Executives and employees must adhere. They must also carefully follow the guidelines for connected transactions and refrain from violating the regulations of SEC and SET. Directors and Executives under SEC’s definition must report their interests and those of their related parties to the Company. In addition, a related party transactions manual has been issued, and criteria, procedures, and protocols concerning connected transactions have been communicated to relevant units under GC Group. Lists of individuals with connection to the Company and information on such transactions have been recorded in a database retrievable by relevant departments for reference so as to ensure correct and full compliance with relevant criteria and prevent errors. GC has also put in place measures to prevent conflicts of interest, under which Directors, Executives, and all employees are required to annually report potential conflicts of interest. When a conflict of interest arises, the person with vested interests must immediately report GC of such a conflict, using the Conflict of Interest Form (for the Directors) or report via the intranet (for Executives and employees), to their supervisors for acknowledgement so that they can take suitable action. Details on the results of the prevention of conflicts of interest appears under “Ensure Compliance with Corporate Governance policy and practices.” Anti-corruption GC has established an Anti-Corruption Policy, which has been approved and overseen by the Board of Directors, as well as written guidelines prohibiting all requests, acceptance, payments, and transactions with individuals or juristic persons involved in corruption, with disciplinary sanctions clearly defined. The policy is included in the Corporate Governance and Business Code of Conduct Handbook for Directors, Executives, and employees to follow. In addition, the Company is a member of Thai Private Sector Collective Action Against Corruption (CAC) as well as a CAC Change Agent and encourages its suppliers to join CAC as a member. Further details can be found under “Ensure Compliance with Corporate Governance policy and practices.” Business Code of Conduct Corporate Governance and Business Code of Conduct Handbook The Board of Directors approved the compilation of ‘Corporate Governance and Business Code of Conduct Handbook,” comprising two parts. The first part is the corporate governance structure, and the second part is the principles according to corporate governance policy and business code of conduct, consisting of principles and best practices for ethical business operations, such as observance of laws, rules, and regulations; anti-fraud and anti-corruption measures; responsibility towards stakeholders; human rights; consumer rights; and fair labor. The handbook was distributed to all Directors, Executives and employees and required them to sign a compliance statement to pledge their adoption of the handbook as guidance in their performance of duties according to corporate governance policy. The Business Code of Conduct Handbook has also been distributed to GC’s joint ventures and business partners and published on the Company’s website (www.pttgcgroup. com) under “Corporate Governance and Business Code of Conduct Handbook” for ready access for stakeholders, regulatory agencies, and those interested. The details of the Business Code of Conduct are shown in Attachment 5 under “GC Policy and Practices of Corporate Governance and Business Code of Conduct.” Additionally, the Board of Directors has implemented an annual review of the Corporate Governance and Business Code of Conduct Handbook to ensure its consistency with criteria and practices issued by regulators and assessment agencies, both domestic GC SPIRIT 4 Core Behaviors Integrity Ethics 143 PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED Form 56-1 One Report 2023

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