GC One Report 2023 [EN]

Self-assessment (Assessment of Individual Directors): The assessment form comprised three main sections: 1) Directors’ knowledge and expertise, self-development, and teamwork, 2) Board performance of duties, and 3) dedication of time and meeting attendance. The average self-assessment score was 97.2%. Cross-assessment (Individual Assessment of Other Directors): The assessment form comprised three main sections: 1) the Director’s knowledge and expertise, self-development, and teamwork, 2) Board performance of duties, and 3) dedication of time and meeting attendance. The average cross-assessment score was 99%. Sub-committees Annual performance assessments, both at committee (group) and individual levels, have been prescribed for all four Sub-committees. In 2023, every Sub-committee reviewed and revised the assessment questionnaires and criteria to ensure alignment with good corporate governance practices. (1) Audit Committee The group assessment of the Audit Committee comprised two parts. The first part pertained to its composi t ion, cover ing the topics of the Audi t Committee’s Charter, qualifications, meetings, learning, and data access; and the second part pertained to its performance of duties, covering the topics of roles and responsibilities and performance reporting to the Board. The individual assessment comprised the following topics: knowledge and expertise, discharge of duties, and meeting attendance. The average score of the group assessment was 99.3%, and the average score of the individual assessment was 97.5%. (2) Nomination and Remuneration Committee The group assessment comprised the following topics: composition and qualifications, performance of duties, guidelines for Directors, meeting attendance, reporting and performance evaluation. The individual assessment comprised the following topics: knowledge and expertise, performance of duties, guidelines for Directors, and dedication of time and meeting attendance. The average score of the group assessment was 99.6%, and the average score of the individual assessment was 98.9%. (3) Corporate Governance and Sustainability Committee The group assessment comprised the following topics: composition and qualifications, performance of duties, guidelines for Directors, meeting attendance, reporting and performance evaluation. The individual assessment comprised the following topics: knowledge and expertise, performance of duties, guidelines for Directors, and dedication of time and meeting attendance. The average score of the group assessment was 98.1%, and the average score of the individual assessment was 91.9%. (4) Risk Management Committee The group assessment comprised the following topics: composition and qualifications, roles and responsibilities, and meeting attendance. The individual assessment comprised the following topics: responsibilities, adherence to business ethics and code of conduct, and dedication of time to duties and self-development. The average score of the group assessment is 99.8%, and the average score of the individual assessment is 99.8%. 187 PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED Form 56-1 One Report 2023

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