Winbond: Announcement of Personnel Change for R&D Head

1. Type of personnel change (please enter spokesperson, acting spokesperson, important operational manager (e.g., CEO, COO, CMO, CSO), financial manager, accounting manager, corporate governance officer, chief information security officer, R&D manager, internal audit manager, or litigation and non-litigation agent): R&D manager 2. Date of change: 2026/05/05 3. Name, position, and brief resume of former incumbent: Bai Pei-Lin, current Technology Director of Advanced Technology R&D Group of the Company 4. Name, position, and brief resume of new incumbent: Zhang Shuo-Zhe, current Deputy Director of Technology at Customized Memory Technology R&D Center of the Company 5. Type of change (please enter "resignation", "position adjustment", "severance", "retirement", "death", "new appointment" or "dismissal"): Position adjustment 6. Reason for change: Position adjustment 7. Effective date: 2026/06/01 8. Other matters to be specified: None