No. Name Company Subsidiaries Joint Venture Associate Company Related Companies IRPC Public Company Limited IRPC Technology Company Limited IRPC A&L Company Limited iPolymer Company Limited IRPC Polyol Company Limited WHA Industrial Estate Rayong Company Limited Mitex Polymer (Thailand) Company Limited UBE Chemicals (Asia) Public Company Limited IRPC Clean Power Company Limited PTT Public Company Limited Energy Complex Company Limited 1. Dr. Siri Jirapongphan x 2. Mr. Yodchat Tasarika / 3. Miss Siriwan Chierapong / 4. Mr. Chansak Chuenchom / // x 5. Mr. Supot Laosuarpha (1) / 6. Miss Piangpanor Boonklam / // 7. Asst. Prof. Dr. Chaiyaporn Puprasert / 8. Mr. Petai Mudtham / 9. General Aittipol Suwannarat / 10. Mr. Prasong Intaranongphai / // 11. Mrs. Pranot Tirasai (2) / 12. Mr. Pornchai Thiraveja (3) / 13. Mr. Somchai Rangsithananon (4) / 14. M.D. Korn Pongjitdham (5) / 15. Mr. Kris Imsang /, // / // 16. Mr. Somnuk Bomrungsalee (6) / 17. Dr. Anusorn Saengnimnuan (7) / 18. Mr. Jumpol Sumpaopol (8) / 19. Dr. Ekniti Nitithanprapas (9) / 20. Mr. Woravuth Sivapetranart (10) // / / / / 21. Mr. Phichin Aphiwantanaporn // / / / / / / 22. Miss Wanida Uthaisomnapa // x x / / / 23. Mr. Pranarch Kosayanont // / x / 24. Mr. Poramet Junwichit // x Positions of Directors and Executives in Subsidiaries/ Associate Companies/Related Companies (as of 31 December 2023) Notes: X = Chairman / = Director // = Executive (1) Mr. Supoj Laosuapa passed away on December 26, 2023. (2) Mr. Pranot Tirasai was appointed as director at the AGM on April 5, 2023. (3) Mr. Pornchai Thiraveja was appointed as director at the AGM on April 5, 2023. (4) Mr. Somchai Rangsithananon was appointed as director at the AGM on April 5, 2023. (5) M.D. Korn Pongjitdham was appointed as independent director at the AGM on April 5, 2023. (6) Mr. Somnuk Bomrungsalee completed his term at the AGM on April 5, 2023. (7) Dr. Anusorn Saengnimnuan completed his term at the AGM on April 5, 2023. (8) Mr. Jumpol Sumpaopol completed his term at the AGM on April 5, 2023. (9) Dr. Ekniti Nitithanprapas completed his term at the AGM on April 5, 2023. (10) Mr. Woravuth Sivapetranart retired on December 31, 2023. 245 Corporate Governance Structure and Important Information about the Board of Directors, Board’s Committees, Executives and Employees 56-1 ONE REPORT 2023
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