Announcement on Re-appointment of Tianjian Certified Public Accountants (Special General Partnership) as the Company's Auditor for 2026

Securities Code: 300492 Securities Abbreviation: Huatu Ding Announcement No.: 2026-022 Huatu Ding Design Co., Ltd. Announcement on Re-appointment of Tianjian Certified Public Accountants (Special General Partnership) as the Company's Auditor for 2026 The Company and the entire Board of Directors guarantee that the information disclosed is true, accurate, and complete, and that there are no false records, misleading statements, or material omissions. Huatu Ding Design Co., Ltd. (hereinafter referred to as the "Company") held the eleventh meeting of the Fifth Board of Directors on April 27, 2026, and reviewed and approved the "Proposal on Re-appointing Tianjian Certified Public Accountants (Special General Partnership) as the Company's Auditor for 2026". This matter needs to be submitted to the Company's 2025 Annual General Meeting of Shareholders for review and approval. The specific situation is hereby announced as follows: I. Explanation of the Proposed Re-appointment of the Accounting Firm Tianjian Certified Public Accountants (Special General Partnership) (hereinafter referred to as "Tianjian") has the qualifications for auditing securities and futures business, and has the experience and capability to provide audit services for listed companies. In the process of providing audit services to the Company, it has adhered to the principles of independence, objectivity, fairness, and impartiality. The reports issued by Tianjian objectively and truthfully reflect the Company's actual situation, financial status, and operating results, fulfilling the duties of an audit institution. It has demonstrated good professional ethics and business quality, safeguarding the legitimate rights and interests of the Company and its shareholders from a professional perspective. To ensure the continuity of the Company's audit work, the Company proposes to continue to engage Tianjian as the Company's auditor for 2026. The term of engagement is one year, effective from the date of approval by the 2025 Annual General Meeting of Shareholders. The audit fee for 2026 will be determined by the Board of Directors, which will authorize the Company's management to determine it based on the specific workload and market price level. II. Basic Information of the Proposed Re-appointed Accounting Firm (I) Basic Information Firm Name: Tianjian Certified Public Accountants (Special General Partnership) Date of Establishment: July 18, 2011 Organizational Form: Special General Partnership Registered Address: No. 128 Xixi Road, Lingyin Street, Xihu District, Hangzhou City Chief Partner: Zhong Jianguo Number of Partners at Year-End: 250 Number of Practicing Accountants at Year-End: 2,363 Number of Certified Public Accountants Who Signed Securities Service Audit Reports: 954 2025 (Audited) Business Revenue Total Business Revenue: 29.88 billion yuan Audit Business Revenue: 26.01 billion yuan Securities Business Revenue: 15.47 billion yuan Number of C