【UMC】Announcement of Completion and Execution Status of Treasury Stock Repurchase Period

1. Original upper limit of total repurchase amount (NT$): 15,458,997,858 2. Original repurchase period: 115/05/26 ~ 115/07/24 3. Original number of shares intended for repurchase: 14,000,000 4. Original price range for repurchase (NT$): 39.00 ~ 48.00 5. Actual repurchase period: 115/05/26 ~ 115/07/14 6. Number of shares actually repurchased: 1,763,000 7. Total amount spent on repurchase (NT$): 70,377,948 8. Average repurchase price per share (NT$): 39.92 9. Cumulative number of company shares held: 1,763,000 10. Percentage of total issued shares held: 0.10% 11. Reason for incomplete execution: To protect the interests of all shareholders and maintain market mechanisms, the company adopted a phased repurchase strategy based on stock price movements and trading volume, resulting in incomplete execution. 12. Other disclosures: None