Announcement of General Manager Change at Key Subsidiary Jya Semiconductor

Release Date: July 11, 2026 Statement Date: July 10, 2026 Statement Time: 15:07:54 Company Code: 2340 Company Name: Taiwan Asia Semiconductor Co., Ltd. (TAIYA)

Subject: Announcement of General Manager Change at Key Subsidiary Jya Semiconductor Inc.

Applicable Clause: Clause 6 Factual Date: July 10, 2026

Details: 1. Board Resolution Date or Change Date: July 10, 2026 2. Position (Chairman or General Manager): General Manager 3. Former Name: Li Guo-Guang 4. Former Resume: Chairman, Taiwan Asia Semiconductor Inc. 5. New Name: Wang Jing-Long 6. New Resume: President of BU3, Visionox Technology Inc., Mainland China 7. Nature of Change (e.g., 'Resignation', 'Dismissal', 'End of Term', 'Job Adjustment', 'Redundancy', 'Retirement', 'Deceased', or 'New Appointment'): New Appointment 8. Reason for Change: New Appointment 9. Effective Date of New Appointment: July 10, 2026 10. Other Matters to be Clarified: This major information pertains to a publicly issued company and simultaneously meets the criteria under Article 7, Paragraph 6 of the Enforcement Rules of the Securities and Exchange Act regarding matters significantly affecting shareholders' rights or securities prices. No additional matters to be disclosed.