Formosa Taffeta: Supplementary Announcement on Board Resolution to Convene 2026 Annual General Meeting of Shareholders (Added Discussion Items)

1. Date of board resolution: 2026/05/08 2. Date of shareholder meeting: 2026/06/26 3. Location of shareholder meeting: No. 380, Section 6, Nanjing East Road, Taipei City 4. Method of convening shareholder meeting (physical shareholder meeting/video-assisted shareholder meeting/video shareholder meeting): Physical shareholder meeting 5. Agenda Item 1: Reporting Matters (1): The company's 2025 operating report. (2): Report on the audit committee's review of the company's 2025 financial statements. (3): Report on the company's distribution of 2025 employee and director compensation. (4): Report on the company's distribution of 2025 cash dividends. 6. Agenda Item 2: Approval Matters (1): For the legal submission of the company's 2025 financial statements, please approve. (2): For the legal submission of the company's 2025 profit distribution proposal, please approve. 7. Agenda Item 3: Discussion Matters (1): For the proposed lifting of non-compete restrictions on the company's new directors, please resolve. 8. Agenda Item 4: Election Matters (1): For the expiration of the term of the company's directors, please legally re-elect. 9. Provisional motions: 10. Start date for share transfer suspension: 2026/04/28 11. End date for share transfer suspension: 2026/06/26 12. Other matters that should be specified: (1) This annual general meeting will legally re-elect all 9 directors (including 3 independent directors). (2) In accordance with Article 172-1 and Article 192-1 of the Company Act and Article 5 of the company's "Regulations for Election of Directors", shareholder proposals and director nominations will be accepted from 2026/04/20 to 2026/04/29 at the company's stock affairs section. Address: 10F, A5 Building, No. 380, Section 6, Nanjing East Road, Taipei City. Phone: 02-2718-9898.