Tat Yi Appoints Ya-Wen Chiu as Chief Sustainability Officer

Release Date: June 25, 2026 Statement Date: June 24, 2026 Statement Time: 14:41:50 Company Code: 2478 Company Name: Tat Yi Subject: Announcement of Board Approval for the Appointment of Chief Sustainability Officer Applicable Clause: Clause 8 Event Date: June 24, 2026

Details: 1. Type of Personnel Change (e.g., Spokesperson, Acting Spokesperson, Key Operational Executive such as CEO, COO, CMO, CSO, Financial Officer, Accounting Officer, Corporate Governance Officer, Chief Information Security Officer, R&D Head, Internal Audit Head, or Litigation/Non-litigation Representative): Chief Sustainability Officer 2. Effective Date of Change: June 24, 2026 3. Former Officer’s Name, Title, and Resume: Not applicable 4. New Officer’s Name, Title, and Resume: Ya-Wen Chiu, Senior Deputy Director of the Internal Audit Department at the Company 5. Nature of Change (e.g., Resignation, Reassignment, Dismissal, Retirement, Death, New Appointment, Removal): New Appointment 6. Reason for Change: New Appointment 7. Effective Date: June 24, 2026 8. Other Matters to be Disclosed: None