Zhongtai Announces Completion of Treasury Stock Repurchase Period and Execution Details

1. Original upper limit of total repurchase amount (NT$): 1,427,574,590 2. Originally scheduled repurchase period: 2026/04/20 ~ 2026/06/19 3. Originally scheduled number of shares to be repurchased: 1,500,000 4. Originally scheduled repurchase price range (NT$): 65.00 ~ 95.00 5. Actual repurchase period: 2026/04/20 ~ 2026/06/18 6. Number of shares actually repurchased: 1,049,000 7. Total amount spent on repurchased shares (NT$): 85,701,893 8. Average repurchase price per share (NT$): 81.70 9. Cumulative number of self-held shares (shares): 1,049,000 10. Ratio of cumulative self-held shares to total issued shares (%): 1.15 11. Reason for incomplete execution: To protect shareholder interests and respect market mechanisms, the company adopted a phased repurchase strategy based on stock price movements and trading volume, thus the full plan was not executed. 12. Other matters to be disclosed: None