[GW Instek] Announcement on determining the ex-dividend record date

1. Date of resolution by the board of directors or shareholders' meeting: 115/06/05 2. Type of ex-right or ex-dividend: Ex-dividend 3. Type and amount of common stock dividend: Cash dividend: NT$362,618,223 (2.5 NTD per share) 4. Ex-dividend trading date: 115/06/24 5. Last transfer date: 115/06/25 6. Stop transfer start date: 115/06/26 7. Stop transfer end date: 115/06/30 8. Ex-dividend record date: 115/06/30 9. Bond conversion application deadline: 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: 115/07/21 13. Other matters: None