[China Steel] Announcement on changes in Executive Vice President, Spokesperson, and Chief Information Security Officer

1. Type of personnel change (please enter Spokesperson, Acting Spokesperson, important operational manager (e.g., CEO, COO, CMO, CSO, etc.), financial manager, accounting manager, corporate governance officer, chief information security officer, R&D manager, internal audit manager, or litigation and non-litigation agent): Executive Vice President, Spokesperson, and Chief Information Security Officer. 2. Date of change: May 8, 2026. 3. Name, rank, and brief resume of the former incumbent: Not applicable. 4. Name, rank, and brief resume of the new incumbent: Liu Hung-Yi; New Executive Vice President, Spokesperson, and Chief Information Security Officer of the company; formerly the company's Vice President of Technology. 5. Type of change (please enter "resignation," "job adjustment," "layoff," "retirement," "death," "new appointment," or "dismissal"): New appointment. 6. Reason for change: New appointment. 7. Effective date: May 8, 2026. 8. Other matters that should be stated: The new Vice President of Technology will be announced separately after confirmation.