【Sino-American Silicon Products】Announcement of Personnel Change for the Company's R&D Head

1. Type of personnel change (please enter spokesperson, acting spokesperson, important operational executive (e.g., CEO, COO, CMO, CSO), financial executive, accounting executive, corporate governance executive, information security executive, R&D executive, internal audit executive or litigation and non-litigation agent): R&D Executive 2. Date of change: April 28, 2026 3. Name, title, and brief resume of the former holder: Chen Tuo-cheng, Title: R&D Department Manager 4. Name, title, and brief resume of the new holder: Chen Chun-chang, Title: R&D Department Project Manager 5. Status of change (please enter "resignation", "job role adjustment", "layoff", "retirement", "death", "new appointment" or "dismissal"): Job role adjustment 6. Reason for change: Job role adjustment 7. Effective date: April 28, 2026 8. Other matters to be specified: None