【Dingxuan-KY】Announcement of the Company's Change of Certifying Accountants Due to Internal Adjustment within the Accounting Firm

1. Date of board approval (date of occurrence of the event): 2026/05/12 2. Name of previous accounting firm: Deloitte & Touche 3. Name of previous certifying accountant 1: Peng Yi-Hua 4. Name of previous certifying accountant 2: Lu Yi-Chen 5. Name of new accounting firm: Deloitte & Touche 6. Name of new certifying accountant 1: Peng Yi-Hua 7. Name of new certifying accountant 2: Zeng Jian-Ming 8. Reason for change of accountants: The previous accountants have continuously served for seven years, thus the certifying accountants will be changed starting from the review of the Q1 2026 financial report. 9. Explanation as to whether the company proactively terminated or did not continue the appointment, or whether the previous accountants proactively terminated or did not continue to accept the appointment: Not applicable 10. Date the company notified or was notified of the termination: 2026/04/16 11. Whether financial reports filed or to be prepared in the past two years have been adjusted by accountants or suggested significant improvements in internal controls: Not applicable 12. Whether the company has different opinions on the above adjustments or suggestions (if there are different opinions, please provide a detailed explanation of the nature of each item, the company's original handling method and final handling results, and the written opinions of the succeeding accountants on each item): Not applicable 13. Before the company formally appointed the succeeding accountants, did it consult with them regarding the handling of the adjustments and suggestions made by the previous accountants and their potential opinions on the financial statements (if so, please input the inquiry items and results): Not applicable 14. Explain whether the previous accountants are authorized to fully answer reasonable inquiries from the succeeding accountants (including matters with different opinions as mentioned above): Not applicable 15. Other matters that need to be specified (if the subject of the event or resolution is a public offering company or above, this material information also complies with Article 7, Paragraph 7 of the Enforcement Rules of the Securities and Exchange Act, which stipulates matters that have a material impact on shareholders' equity or securities prices): None