[CSEC-KY] Announcement of Change in Internal Audit Supervisor of Subsidiary CTBC Capital Co., Ltd.

1. Type of Personnel Change (Spokesperson, Deputy Spokesperson, Important Operational Executives (e.g., CEO, COO, CMO, CSO), Financial Officer, Accounting Officer, Corporate Governance Officer, Chief Information Security Officer, R&D Officer, Internal Audit Officer, or Litigation and Non-litigation Agent): Internal Audit Officer 2. Date of Change: June 9, 2026 (Year 115 of the Republic of China calendar) 3. Name, Position, and Brief Biography of Former Officer: Chen Ying-lin 4. Name, Position, and Brief Biography of New Officer: Hsieh Yu-cheng 5. Circumstances of Change (Please enter 'Resignation', 'Job Adjustment', 'Dismissal', 'Retirement', 'Death', 'New Appointment', or 'Removal'): Resignation 6. Reason for Change: Resignation 7. Effective Date: June 10, 2026 (Year 115 of the Republic of China calendar) 8. Other Matters to be Noted: None