Formosa Plastics Announces Board Resolution on Sustainability Committee Members

1. Date of Change: 2026/06/26 2. Functional Committee Name: Sustainability Committee. 3. Former Members: Li Min-Zhang, Li Jian-Kuan, Lin Sheng-Zhong, Guo Nian-Xiong, Guo Jia-Qi. 4. Former Members' Resumes: (1) Li Min-Zhang: General Manager of the Company. (2) Li Jian-Kuan: Executive Vice General Manager of the Company. (3) Lin Sheng-Zhong: Independent Director of the Company; Independent Director at Taiwan Glass Industrial and Century Steel Structures Corp.; Advisor to the Chinese Association of Business Economists. (4) Guo Nian-Xiong: Independent Director of the Company; Director at Hesong Technology Corp. (5) Guo Jia-Qi: Independent Director of the Company; Certified Public Accountant at Guo Jia-Qi CPA Firm; Independent Director at Zhixing Precision Machinery Corp.; Director at Fu-Hwa Innovation Corp. 5. New Members: Li Min-Zhang, Li Jian-Kuan, Lin Sheng-Zhong, Guo Nian-Xiong, Guo Jia-Qi. 6. New Members' Resumes: (1) Li Min-Zhang: General Manager of the Company. (2) Li Jian-Kuan: Executive Vice General Manager of the Company. (3) Lin Sheng-Zhong: Independent Director of the Company; Independent Director at Taiwan Glass Industrial and Century Steel Structures Corp.; Advisor to the Chinese Association of Business Economists. (4) Guo Nian-Xiong: Independent Director of the Company; Director at Hesong Technology Corp. (5) Guo Jia-Qi: Independent Director of the Company; Certified Public Accountant at Guo Jia-Qi CPA Firm; Independent Director at Zhixing Precision Machinery Corp.; Director at Fu-Hwa Innovation Corp. 7. Nature of Change (select from 'resignation', 'removal', 'term expiration', 'death', or 'new appointment'): Term expiration. 8. Reason for Change: Reappointment upon term expiration. 9. Previous Term (e.g., 2023/06/16 ~ 2026/06/15): 2023/06/16 ~ 2026/06/15 10. Effective Date of New Appointment: 2026/06/26 11. Other Matters to be Disclosed: None.