Kao Hsing Chang Announces Change of Spokesperson

1. Position affected (please specify spokesperson, acting spokesperson, key operational executive (e.g., CEO, COO, CMO, CSO), financial officer, accounting officer, corporate governance officer, CISO, R&D head, internal audit head, or litigation/non-litigation agent): Spokesperson

2. Date of change: July 20, 2026 (R.O.C. Year 115)

3. Name, title, and brief resume of outgoing individual: Spokesperson: Pang-Feng Hsu, Manager of Steel Pipe Division

4. Name, title, and brief resume of incoming individual: Spokesperson: Not applicable

5. Nature of change (please select from 'resignation', 'reassignment', 'layoff', 'retirement', 'death', 'new appointment', or 'dismissal'): Retirement

6. Reason for change: Retirement

7. Effective date: July 20, 2026 (R.O.C. Year 115)

8. Additional disclosures:

(1) Mr. Pang-Feng Hsu, the company spokesperson, retired on July 20, 2026. His responsibilities will be temporarily assumed by Mr. Chien-Hung Kuo, acting spokesperson.

(2) The appointment of the new spokesperson will be announced separately following board approval.