[DaYi] Announcement of the Chairman's Decision on Ex-Dividend Record Date

1. Date of board resolution, shareholder resolution, or company decision: June 8, 2026 2. Type of ex-rights/ex-dividend (please fill in "ex-rights", "ex-dividend", or "ex-rights and ex-dividend"): ex-dividend 3. Type and amount of dividends distributed on common shares: cash dividend, NT$0.75 per share 4. Ex-dividend trading date: June 30, 2026 5. Last record date: July 1, 2026 6. Book closure start date: July 2, 2026 7. Book closure end date: July 6, 2026 8. Ex-dividend record date: July 6, 2026 9. Last conversion date for bonds: not applicable 10. Bond conversion suspension start date: not applicable 11. Bond conversion suspension end date: not applicable 12. Cash dividend payment date for common shares: July 30, 2026 13. Other matters to be stated: none