2484 Siihua: Board Announces Re-election of Chairman

Disclosure Date: June 24, 2026 Statement Date: June 23, 2026 Statement Time: 13:52:13 Company Code: 2484 Company Name: Siihua Crystal Technology Co., Ltd. Subject: Announcement of Board Election of Chairman Applicable Clause: Clause 6 Event Date: June 23, 2026

Details: 1. Board Resolution or Change Date: June 23, 2026 2. Position: Chairman 3. Former Incumbent Name: Tseng, Ying-Tang 4. Former Incumbent Resume: Chairman, Siihua Crystal Technology Co., Ltd. 5. New Appointee Name: Tseng, Ying-Tang 6. New Appointee Resume: Chairman, Siihua Crystal Technology Co., Ltd. 7. Nature of Change: Term Expiration 8. Reason for Change: Upon expiration of term, re-elected by the newly convened board 9. Effective Date of New Appointment: June 23, 2026 10. Additional Remarks: None.

This announcement may qualify as material information under Article 7, Clause 6 of the Enforcement Rules of the Securities and Exchange Act for publicly issued companies, though no significant impact on shareholder rights or stock price is anticipated.