[GUC] Board of Directors Unanimously Elects Ms. Zhang Lisi as Chairperson

1. Date of Board Resolution or Change: 2026/05/21 2. Position: Chairperson 3. Previous Chairperson: Zeng Fancheng 4. Previous Chairperson's Profile: Ph.D. in Electrical Engineering from National Cheng Kung University, Vice Chairman of Vanguard International Semiconductor, Director at TSMC. 5. New Chairperson: Zhang Lisi 6. New Chairperson's Profile: M.S. in Electrical Engineering from the University of Pennsylvania, Senior Director of TSMC Design Infrastructure Management Division, Vice Chairperson of GUC. 7. Reason for Change: Expiration of term. 8. Effective Date: 2026/05/21 9. Other: No further material details.