【TungThih-KY】Announcement of Change of Internal Audit Supervisor Approved by Board of Directors

1. Type of personnel change (please enter: spokesperson, deputy spokesperson, key operational officer (e.g., CEO, COO, CMO, strategy officer), financial officer, accounting officer, corporate governance officer, information security officer, R&D officer, internal audit supervisor, or litigation/non-litigation agent): Internal audit supervisor 2. Date of change: 2026/06/08 3. Name, title, and resume of former officer: Ko Chun-Ming / Audit Supervisor of TungThih Holding Co., Ltd. 4. Name, title, and resume of new officer: Hsu Shao-Chun / Audit Manager of TungThih Acoustics Co., Ltd. 5. Nature of change (please enter: “resignation”, “job adjustment”, “layoff”, “retirement”, “death”, “new appointment”, or “dismissal”): Job adjustment 6. Reason for change: Job adjustment 7. Effective date: 2026/06/15 8. Other matters to be stated: None