Chang Guang Announces Change of Supervisor at Key Subsidiary Japan Nikko-Materials Co., Ltd.

1. Date of Change: 2026/08/06 2. Category of Appointed or Changed Personnel (e.g., Corporate Director, Corporate Supervisor, Independent Director, Individual Director, or Individual Supervisor): Corporate Supervisor 3. Former Title and Name: Representative of Chang Guang Precision Machinery Co., Ltd.: Li Xiao-Ying 4. Former's Resume: Accounting Officer, Chang Guang Precision Machinery Co., Ltd. 5. New Title and Name: Representative of Chang Guang Precision Machinery Co., Ltd.: Wu Zhi-Xuan 6. New's Resume: Chief Financial Officer, Financial Officer, and Corporate Governance Officer, Chang Guang Precision Machinery Co., Ltd. 7. Nature of Change (e.g., Resignation, Removal, Term Expiration, Death, or New Appointment): Resignation 8. Reason for Change: The incumbent supervisor resigned; a new representative was re-designated by the corporate supervisor and elected at an extraordinary shareholders' meeting. 9. Number of Shares Held by New Appointee at Time of Election: 11,520 shares 10. Original Term (e.g., xx/xx/xx ~ xx/xx/xx): 2023/07/01 ~ 2027/03/31 11. Effective Date of New Appointment: 2026/08/06 12. Ratio of Director Changes During Same Term: Not applicable 13. Ratio of Independent Director Changes During Same Term: Not applicable 14. Ratio of Supervisor Changes During Same Term: 2/2 15. Whether More Than One-Third of Directors Have Changed (Yes or No): No 16. Other Matters to be Disclosed (If the subject of the event or resolution is a publicly issued company, this significant information also meets Article 7, Paragraph 6 of the Enforcement Rules of the Securities Trading Act regarding matters significantly affecting shareholder rights or securities prices): None Keyword: Material Information