[UMC] Announcement that the company's share buyback amount has reached NT$300 million or more

1. Date on which the cumulative number of shares bought back reached 2% of the total issued shares or the amount reached NT$300 million or more: 115/05/15 2. Number of shares bought back this time (shares): 3,780,000 3. Total amount of shares bought back this time (NT$): 406,598,693 4. Average buyback price per share this time (NT$): 107.57 5. Cumulative number of own company shares held during the buyback period (shares): 20,531,000 6. Ratio of cumulative number of own company shares held during the buyback period to the total number of issued company shares (%): 0.16 7. Other matters to be specified: None