【CSCC】Announcement of Change in Representative of Corporate Director and Change of More Than One-Third of Directors of the Company

1. Date of occurrence of the change: 2026/04/28 2. Type of personnel selected or changed (please enter corporate director, corporate supervisor, independent director, natural person director, or natural person supervisor): Corporate director 3. Name and title of the previous appointee: Representative of China Steel Corporation: Cheng Chi-Chao 4. Brief resume of the previous appointee: Executive Vice President of China Steel Corporation 5. Name and title of the new appointee: Representative of China Steel Corporation: Liu Hong-Yi 6. Brief resume of the new appointee: Vice President of Technology Department of China Steel Corporation 7. Reason for change (please enter 'resignation', 'dismissal', 'term expiration', 'death', or 'new appointment'): New appointment 8. Reason for change: Corporate director appointed new representative 9. Number of shares held by the new appointee at the time of appointment: 66,487,844 10. Original term (e.g., xx/xx/xx ~ xx/xx/xx): 2023/05/31~2026/05/30 11. Effective date of new appointment: 2026/04/30 12. Ratio of board changes during the same term: 8/11 13. Ratio of independent board changes during the same term: 0 14. Ratio of supervisor changes during the same term: 0 15. Is this a change of more than one-third of the directors (please enter Yes or No): Yes 16. Other matters that need to be specified (If the subject of the event or resolution is a public offering company or higher, this material information also complies with Article 7, Paragraph 6 of the Enforcement Rules of the Securities and Exchange Act regarding matters that have a material impact on shareholders' equity or securities prices): None