Announcement of Expiry and Execution Status of Ching-Teng's Treasury Stock Buyback Period

1. Original planned upper limit for treasury stock buyback (NTD): 12,780,233,766 2. Original planned buyback period: 115/03/11~115/05/10 3. Original planned buyback quantity (shares): 3,000,000 4. Original planned buyback price range (NTD): 28.39~45.00 5. Actual buyback period: 115/03/13~115/03/24 6. Actual shares repurchased (shares): 150,000 7. Actual total amount spent (NTD): 6,332,707 8. Actual average price per share repurchased (NTD): 42.22 9. Accumulated number of treasury shares held (shares): 150,000 10. Ratio of accumulated treasury shares held to total issued shares (%): 0.04 11. Reason for incomplete execution: The stock price mostly exceeded the upper limit of the planned buyback price range, making it impossible to execute within the approved price range. 12. Other matters to be noted: The planned buyback period for treasury shares was from March 11 to May 10, 115. As May 10, 115, was not a business day, an early announcement was made on May 8, 115.