【Yieh Huh】Announcement of the Execution of the 25th Treasury Stock Buyback

1. Original total amount上限 for share buyback (NT$): 2,640,312,634 2. Original buyback period: 2026/07/28 ~ 2026/09/26 3. Original number of shares to be bought back: 15,000,000 4. Original buyback price range (NT$): 13.00 ~ 15.50 5. Actual buyback period: 2026/07/28 ~ 2026/09/22 6. Actual number of shares bought back: 7,840,000 7. Total amount of shares bought back (NT$): 107,903,533 8. Average buyback price per share (NT$): 13.76 9. Cumulative number of treasury shares held: 24,138,000 10. Cumulative treasury shares as a percentage of total issued shares: 1.33% 11. Reason for incomplete execution: To balance market mechanisms and protect overall shareholder interests, considering that stock price fluctuations have stabilized, the plan was not fully executed. 12. Other matters to be stated: None