[Shengtai] Announcement of the Ex-Dividend Record Date for Cash Dividends

1. Date of Board of Directors/Shareholders' Meeting resolution or company decision: 2026/06/17 2. Type of rights (Ex-rights/Ex-dividend/Both): Ex-dividend 3. Type and amount of cash dividend for common shares: Cash dividend of NT$1 per share 4. Ex-dividend trading date: 2026/07/06 5. Final transfer date: 2026/07/07 6. Starting date for transfer suspension: 2026/07/08 7. Ending date for transfer suspension: 2026/07/12 8. Ex-dividend record date: 2026/07/12 9. Final date for bond conversion application: N/A 10. Starting date for bond conversion suspension: N/A 11. Ending date for bond conversion suspension: N/A 12. Common share cash dividend payout date: 2026/07/31 13. Other remarks: None