【TAIWAN UNION TECHNOLOGY CORPORATION】Announcement of Board's Approval for Appointment of Chief Information Security Officer

### Press Release Body

1. Type of personnel change (please enter spokesperson, acting spokesperson, important operational executive (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): Chief Information Security Officer 2. Date of change: 2026/04/29 3. Name, rank, and brief résumé of former personnel: Not applicable 4. Name, rank, and brief résumé of new personnel: Wang Di-Jun / Group Senior Information Director of the company 5. Type of change (please enter "resignation", "position adjustment", "layoff", "retirement", "death", "new appointment", or "dismissal"): New appointment 6. Reason for change: New appointment 7. Effective date: 2026/05/01 8. Other matters that need to be specified: None