[Formosa Oil] Announcement of Change in the Company's Corporate Governance Officer

1. Type of personnel change (Please enter spokesperson, acting spokesperson, important operational executive (e.g., CEO, COO, CMO, CSO, etc.), financial executive, accounting executive, corporate governance officer, chief information security officer, R&D executive, internal audit executive, or litigation/non-litigation agent): Corporate Governance Officer 2. Date of change: 2026/05/08 3. Name, title, and brief resume of former incumbent: Ye Wen-Lung / Manager, Formosa Oil Co., Ltd. 4. Name, title, and brief resume of new incumbent: None 5. Details of change (Please enter "Resignation", "Position Adjustment", "Layoff", "Retirement", "Death", "New Appointment", or "Dismissal"): Resignation 6. Reason for change: Resignation 7. Effective date: 2026/05/08 8. Other matters to be specified: None