[Unimicron] Announcement regarding the appointment of the 4th Audit Committee members

1. Date of change: May 29, 2026. 2. Committee name: Audit Committee. 3. Former members: Li Ya-Jing, Chen Lai-Zhu, Wang Sheng-Yu. 4. Former members' background: Li (Senior Special Assistant to GM, Global Communication Semiconductors), Chen (Chairman, Tianlai Smart Health Technology), Wang (Director, Clientron Corp). 5. New members: Lin Hong-Yao, Wang Sheng-Yu, Zhu Wen-Yi, Lin Shui-Xian, Sun Su-Qiu. 6. New members' background: Lin Hong-Yao (GM, ITE Tech), Wang (Director, Clientron Corp), Zhu (Independent Director, Gigabyte), Lin Shui-Xian (Independent Director, Standard Foods), Sun (Senior Director, Accounting/Audit, UMC). 7. Reason: Expiration of term and full re-election. 8. Previous term: May 30, 2023 - May 29, 2026. 9. Effective date: May 29, 2026.