TOPKEY: Announcement of the Board of Directors' Resolution on the Ex-dividend Record Date for 2026

1. Date of resolution by the board of directors, shareholders' meeting, or company decision: May 12, 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 common stock dividend: Cash dividend of NT$726,560,000 (NT$8 distributed per share) 4. Ex-dividend (Ex-rights) trading date: July 16, 2026 5. Last transfer date: July 17, 2026 6. Book closure start date: July 18, 2026 7. Book closure end date: July 22, 2026 8. Ex-dividend (Ex-rights) record date: July 22, 2026 9. Last application date for bond conversion: Not applicable 10. Bond conversion suspension start date: Not applicable 11. Bond conversion suspension end date: Not applicable 12. Common stock cash dividend payment date: August 13, 2026 13. Other matters to be specified: None