Formosa Plastics (Correction) Supplementary Announcement: Board of Directors resolves to convene the 2026 AGM (Additional Discussion Item)

1. Date of board resolution: 115/05/08 2. Date of AGM: 115/06/26 3. Location of AGM: No. 380, Section 6, Nanjing East Road, Taipei City 4. Method of AGM (Physical/Video-assisted/Video): Physical AGM 5. Reason for convening - Report Items: (1): Company's 2025 business report. (2): Audit Committee's report on the company's 2025 financial statements. (3): Report on the company's distribution of employee and director compensation for 2025. (4): Report on the company's cash dividend distribution for 2025. 6. Reason for convening - Approval Items: (1): To legally present the company's 2025 financial statements for approval. (2): To legally present the company's profit distribution proposal for 2025 for approval. 7. Reason for convening - Election Items: (1): To elect all directors whose terms have expired, in accordance with the law. 8. Reason for convening - Discussion Items: (1): To resolve on the proposed lifting of non-compete restrictions for new directors. 9. Adjournment Motion: 10. Record date start: 115/04/28 11. Record date end: 115/06/26 12. Other matters to be disclosed: (1) The AGM will legally elect all 9 directors (including 3 independent directors). (2) In accordance with Article 172-1 and 192-1 of the Company Act and Article 5 of the Company's "Director Election Regulations", shareholder proposals and director nominations will be accepted at the company's stock affairs division from April 20 to April 29, 115 (2026). Address: Building A5, 10th Floor, No. 380, Section 6, Nanjing East Road, Taipei City. Telephone: 02-2718-9898. (3) This correction is made in response to the format requirements for electronic voting automatic conversion. Keywords: Material Information