[Unimicron] Board of Directors Unanimously Re-elects Mr. Chien Shan-chieh as Chairman

1. Date of Board resolution or change: 2026/05/29 2. Position: Chairman 3. Name of former incumbent: Representative of United Microelectronics Corp: Chien Shan-chieh 4. Resume of former incumbent: Chairman of Unimicron Corp. 5. Name of new incumbent: Chien Shan-chieh 6. Resume of new incumbent: Chairman of Unimicron Corp. 7. Reason for change: Expiration of term 8. Reason for change: Expiration of term 9. Effective date: 2026/05/29 10. Other: None