[Walsin] Announcement regarding the change of members of the Company's Sustainability Committee

1. Date of change: 05/22/2026 (Republic of China calendar year 115) 2. Name of functional committee: Sustainability Committee 3. Name of former members: (1) Ming-Ling Hsueh (2) Fu-Hsiung Hu (3) Tzu-Chun Tu (4) Wei-Chuan Kao (5) Yu-Lun Chiao (6) Yu-Hui Chiao 4. Background of former members: (1) Ming-Ling Hsueh: Independent Director, Lite-On Technology Corp. (2) Fu-Hsiung Hu: Independent Executive Director, O-Bank Co., Ltd. (3) Tzu-Chun Tu: Advisor, Taiwan Electrical and Electronic Manufacturers' Association (4) Wei-Chuan Kao: Independent Director, KGI Life Insurance Co., Ltd. (5) Yu-Lun Chiao: Chairman, Walsin Lihwa Corp. (6) Yu-Hui Chiao: Chairperson, Walsin Lihwa Sustainability Foundation 5. Name of new members: (1) Fu-Hsiung Hu (2) Tzu-Chun Tu (3) Wei-Chuan Kao (4) Li-Meng Chiu (5) Yu-Lun Chiao (6) Yu-Hui Chiao 6. Background of new members: (1) Fu-Hsiung Hu: Independent Executive Director, O-Bank Co., Ltd. (2) Tzu-Chun Tu: Advisor, Taiwan Electrical and Electronic Manufacturers' Association (3) Wei-Chuan Kao: Independent Director, KGI Life Insurance Co., Ltd. (4) Li-Meng Chiu: Independent Director, Sinyi Realty Inc. (5) Yu-Lun Chiao: Chairman, Walsin Lihwa Corp. (6) Yu-Hui Chiao: Chairperson, Walsin Lihwa Sustainability Foundation 7. Change status: Expiration of term 8. Reason for change: Full re-election due to expiration of term 9. Former term: 05/19/2023 - 05/18/2026 10. Effective date of new appointment: 05/22/2026 11. Other notes: None