[Apex] Announcement of Ex-Dividend Reference Date

1. Date of Board/Shareholder Meeting resolution or company decision: 2026/05/22 2. Type of Ex-Rights/Ex-Dividend: Ex-Dividend 3. Type and amount of cash dividends on common shares: Cash dividends of 129,935,250 TWD, 1.3 TWD per share. 4. Ex-dividend date: 2026/06/09 5. Last transfer date: 2026/06/10 6. Stop transfer start date: 2026/06/11 7. Stop transfer end date: 2026/06/15 8. Ex-dividend reference date: 2026/06/15 9. Last date for bond conversion application: Not applicable 10. Start date for bond conversion suspension: Not applicable 11. End date for bond conversion suspension: Not applicable 12. Cash dividend payment date: 2026/07/09 13. Other matters: None