【KOSIN】Announcement of Dividend Ex-Dividend Date for the Second Half of 2025 and Adjustment of Cash Dividend Rate

1. Date of Board or Shareholders' Meeting Resolution or Company Decision: June 18, 2026 2. Type of Rights Adjustment (please enter 'Rights Issue', 'Dividend Ex-Date', or 'Rights and Dividend Ex-Date'): Dividend Ex-Date 3. Ordinary Share Dividend Type and Amount: (1) Original Dividend Type and Amount: TWD 7.00 per share, totaling TWD 3,833,102,476. (2) Revised Dividend Type and Amount: TWD 7.11386897 per share, totaling TWD 3,833,102,476. 4. Ex-Dividend Trading Day: July 6, 2026 5. Last Transfer Date: July 7, 2026 6. Transfer Suspension Start Date: July 8, 2026 7. Transfer Suspension End Date: July 12, 2026 8. Ex-Dividend Reference Date: July 12, 2026 9. Final Application Date for Bond Conversion: Not applicable. 10. Bond Conversion Suspension Start Date: Not applicable. 11. Bond Conversion Suspension End Date: Not applicable. 12. Ordinary Share Cash Dividend Payment Date: July 31, 2026 13. Other Matters to be Disclosed: Due to treasury stock repurchases resulting in a reduction of outstanding shares, the cash dividend per share has been adjusted accordingly.