[Unimicron] Announcement of Board Re-election at the 2026 Annual Shareholders' Meeting

1. Date of change: May 29, 2026. 2. Category of personnel: Corporate directors, independent directors, and natural person directors. 3. Former directors: Chien Shan-chieh (rep. UMC), Liu Chi-tung (rep. UMC), Chen Yun-yu (rep. UMC), Lan Ting (rep. Xun Jie Investment), Ma Kuang-hua (rep. Yan Yuan Investment), Lin Ting-yu, and independent directors Li Ya-ching, Chen Lai-chu, Wang Sheng-yu. 4. Profiles of former directors: Chien Shan-chieh (Chairman of Unimicron), etc. 5. New directors: Chien Shan-chieh, Lan Ting (rep. UMC), Ma Kuang-hua (rep. UMC), Chen Kuo-chao (rep. Yan Yuan Investment), and independent directors Lin Hung-yao, Wang Sheng-yu, Chu Wen-yi, Lin Shui-hsien, Sun Su-chiu. 6. Profiles of new directors: Chien Shan-chieh (Chairman of Unimicron), Lan Ting (General Manager of Unimicron), etc. 7. Reason for change: Expiration of terms and full re-election. 8. Shareholding of new directors: Chien Shan-chieh (0 shares), Lan Ting (204,423,723 shares), etc. 9. Effective date: May 29, 2026. 10. Other: This announcement complies with regulations regarding material impacts on shareholder equity.