UMC Announces Completion of 22nd Share Buyback Program and Execution Details

1. Original upper limit of total buyback amount (NT$): 212,951,478,175 2. Original intended buyback period: 115/04/30 ~ 115/06/29 3. Original intended number of shares to be bought back: 50,000,000 4. Original intended buyback price range (NT$): 52.50 ~ 109.50 5. Actual buyback period of this round: 115/05/05 ~ 115/05/20 6. Number of shares actually bought back this time (shares): 30,551,000 7. Total amount spent on shares bought back this time (NT$): 3,095,665,789 8. Average price per share bought back this time (NT$): 101.33 9. Cumulative number of treasury shares held (shares): 30,551,000 10. Ratio of cumulative treasury shares to total issued shares (%): 0.24 11. Reason for incomplete execution: To consider market mechanisms and overall shareholder interests, the company did not fully complete this share buyback program. 12. Other matters to be disclosed: None Keywords: Material Information