[CPDC] Announcement regarding changes in Chairman

1. Date of Board resolution or change: 2026/05/22 2. Personnel type (Chairman or General Manager): Chairman 3. Previous holder's name: Chen Rui-long 4. Previous holder's profile: Chairman of China Petrochemical Development Corp. 5. New holder's name: Not applicable 6. New holder's profile: Not applicable 7. Circumstances of change (e.g., 'Resignation', 'Dismissal', 'Term expiration', 'Job adjustment', 'Layoff', 'Retirement', 'Death', or 'New appointment'): Resignation 8. Reason for change: Considerations of personal career planning 9. Effective date of new appointment: Not applicable 10. Other remarks: Chairman Chen Rui-long decided to resign as Chairman on May 22, 2026, due to considerations of personal career planning, with the resignation effective from June 1, 2026. The new Chairman will be announced following selection by the Board of Directors.