[UCC] Announcement of Board Resolution on Establishing the 2nd Sustainability Committee

1. Date of change: 2026/06/05 2. Name of functional committee: Sustainability Committee 3. Previous incumbent names: (1) Hou Chih-Sheng (2) Hou Chih-Yuan (3) Chang Pei-Te 4. Previous incumbent resumes: (1) General Manager of the Company (2) COO of the Company (3) Assistant Manager, General Manager's Office of the Company 5. New incumbent names: (1) Hou Chih-Sheng (2) Hou Chih-Yuan (3) Chang Pei-Te 6. New incumbent resumes: (1) CEO of the Company (2) General Manager of the Company (3) Assistant Manager, General Manager's Office of the Company 7. Status of change (Resignation, Dismissal, Expiration of term, Deceased, or New appointment): Expiration of term. 8. Reason for change: Expiration of term. 9. Original term: 2025/11/14 ~ 2026/06/15 10. Effective date for new appointment: 2026/05/26 11. Other notes: None.