Taiwan Mask Appoints Yu Chun-Kuang as New Chairman

Release Date: June 27, 2026 Statement Date: June 26, 2026 Statement Time: 13:58:27 Company Code: 2338 Company Name: Taiwan Mask Subject: Announcement of Chairman Appointment by Board of Directors Applicable Clause: Clause 6 Event Date: June 26, 2026 Details: 1. Board Resolution or Change Date: June 26, 2026 2. Position (enter 'Chairman' or 'CEO'): Chairman 3. Former Incumbent Name: Yu Chun-Kuang, Representative of Kuang-Chu Holding Co., Ltd. 4. Former Incumbent Background: Chairman, Taiwan Mask Co., Ltd. 5. New Appointee Name: Yu Chun-Kuang 6. New Appointee Background: Chairman, Taiwan Mask Co., Ltd. 7. Nature of Change (enter 'resignation', 'dismissal', 'end of term', 'duty adjustment', 'redundancy', 'retirement', 'deceased', or 'new appointment'): New Appointment 8. Reason for Change: Full board re-election due to end of term. 9. Effective Date of New Appointment: June 26, 2026 10. Other Matters to Note (if the subject is a publicly issued company or above, this material information also complies with Article 7, Clause 6 of the Enforcement Rules of the Securities and Exchange Act regarding matters significantly affecting shareholders' rights or stock prices): None.