GUANG YU: Announcement of Ex-dividend Record Date

1. Date of resolution by the Board of Directors, Shareholders' Meeting, or company decision: 2026/05/13 2. Type of ex-rights/ex-dividend (please enter "ex-rights", "ex-dividend" or "ex-rights and ex-dividend"): Ex-dividend 3. Type and amount of common stock dividend distribution: Cash dividend totaling NT$466,511,654. NT$0.9 per share. 4. Ex-dividend trading date: 2026/06/30 5. Last date for transfer registration: 2026/07/01 6. Start date of suspension of transfer registration: 2026/07/02 7. End date of suspension of transfer registration: 2026/07/06 8. Ex-dividend record date: 2026/07/06 9. Last date for bond conversion application: Not applicable 10. Start date of suspension of bond conversion: Not applicable 11. End date of suspension of bond conversion: Not applicable 12. Common stock cash dividend payment date: 2026/07/24 13. Other matters to be specified: None