GC One Report 2023 [EN]

8. Consideration related-party transactions and transactions that may constitute conflicts of interest for adherence to laws and regulations of the Stock Exchange of Thailand The Audit Committee reviewed and provided an opinion on the related-party transactions or transactions that are or may have significant conflicts of interest, by considered on the reasonableness of the transactions, details, and the identification of the contract counterparty and relevant risks such as Legal Risks, Financial Risks that materially impact on the Company’s financial position, Operational Risks; particularly International Business Transaction Risks, and New Business Expansion Risks. The Audit Committee also encouraged the Company to set up systems or processes for collecting related-party transactions or transactions that might constitute conflicts of interest in order to monitor anomalies or the transactions have been intentionally to avoid the regulations, as well as to monitoring transaction progress and ensured that information was disclosed completely, accurately and appropriately in accordance with the regulations of the Stock Exchange of Thailand to shareholders on a regular basis. In cases of suspected misconduct transaction or Stock-Price Manipulation, the Audit Committee will take promptly action to prevent and suspend such transactions and report to The Securities and Exchange Commission, Thailand without delay. In 2023, no significant related-party transactions or transactions deviating from contractual obligations that required information disclosure in accordance with the regulations of the Stock Exchange of Thailand. A review of the audit report by the Internal Audit Function regarding related-party transaction review revealed no significant issues that could impact the achievement of the Company’s major objectives. Additionally, the Audit Committee did not receive any report of discrepancies through the review of the disclosure of related-party transactions by the Auditor. 9. Others The Audit Committee scrutinized financial reports on the Company’s fundraising and investment activities, such as asset valuation and the issuance of debentures, etc. The Committee also oversaw and monitored the capital management plan from fundraising process to assure that the financial plan is aligned with the objectives, and appropriately disclosed information to shareholders. The Audit Committee has continually reviewed accounting and financial knowledge and the Audit Committee Charter on an annual basis to ensure alignment with the principles, best practices and guidelines as prescribed by the Securities and Exchange Commission and has reported the Audit Committee’s performance to the Board of Directors at regular intervals. Furthermore, the Audit Committee conducted both whole group and individual assessments of performance and reported the results to the Board of Directors to further uplifting and improving the performance of the Audit Committee. The Audit Committee duly performed duties as prescribed by the Audit Committee Charter and as delegated from the Board of Directors in its entirety on the basis of objectivity, independence with consideration to the stakeholders on an equal basis. The Audit Committee has thus concluded that the financial report prepared by the Company is accurate and reliable, with sufficient disclosure of information in accordance with generally accepted accounting and financial reporting standards, complying to related laws, rules, and regulations relevant to business operations; that the Company upholds good corporate governance, adequate and appropriate risk and internal control management, internal audit activities. The Audit Committee also continue monitoring new regulations, new international standards, and emerging risks relevant to business operations and strategic goal for preparedness in handling potential short- and long-term impacts. The Audit Committee wishes to express gratefulness to the Board of Directors, Executive Officers, the Auditor, and all related entities for the strong collaborative support throughout 2023. On Behalf of the Audit Committee (Signed) Thanwa Laohasiriwong (Mr. Thanwa Laohasiriwong) Chairman of the Audit Committee 211 PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED Form 56-1 One Report 2023

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