【Kester】Announcement: Company's Share Buyback Amount Exceeds NT$300 Million

1. Date when cumulative buyback quantity reached 2% of total issued shares or NT$300 million: 115/04/30 (April 30, 2026) 2. Number of shares repurchased in this buyback (shares): 1,565,000 3. Total amount of shares repurchased (NT$): 323,013,143 4. Average price per share repurchased (NT$): 206.40 5. Cumulative number of own company shares held within the buyback period (shares): 20,627,000 6. Percentage of cumulative own company shares held to total issued shares (%): 3.67% 7. Other matters that need to be stated: None.