Yongyu: Announcement of Board Resolution on Ex-dividend Record Date as June 8, 2026

1. Date of board meeting, shareholders' meeting resolution or company decision: 2026/05/08 2. Type of ex-right or ex-dividend (please enter “ex-right”, “ex-dividend” or “ex-right and ex-dividend”): Ex-dividend 3. Type and amount of common stock dividend: Cash dividend NT$82,147,099 (NT$0.90 per share) 4. Ex-dividend trading date: 2026/06/02 5. Last date for transfer: 2026/06/03 6. Start date of book closure period: 2026/06/04 7. End date of book closure period: 2026/06/08 8. Ex-dividend record date: 2026/06/08 9. Last date for bond conversion application: NA 10. Start date for bond conversion suspension: NA 11. End date for bond conversion suspension: NA 12. Common stock cash dividend payment date: 2026/06/24 13. Other matters to be specified: None Keyword: Material Information