[6719 Richtek] Announcement of ex-dividend reference date for cash dividends

1. Date of resolution by the Board of Directors, Shareholders' Meeting, or company decision: June 17, 2026 2. Type of ex-rights/dividend (Ex-rights, Ex-dividend, or Ex-rights/dividend): Ex-dividend 3. Type and amount of cash dividends for common stock: (1) NTD 485,203,349 4. Ex-rights (dividend) trading date: July 21, 2026 5. Last transfer date: July 22, 2026 6. Transfer suspension start date: July 23, 2026 7. Transfer suspension end date: July 27, 2026 8. Ex-rights (dividend) reference date: July 27, 2026 9. Last conversion application date for bonds: June 30, 2026 10. Bond conversion suspension start date: July 2, 2026 11. Bond conversion suspension end date: July 27, 2026 12. Common stock cash dividend payment date: August 20, 2026 13. Other matters: If the dividend distribution rate changes, the Chairman is authorized to handle it.