2025 Annual Report on the Performance Evaluation of the Accounting Firm

Securities Code: 301076 Securities Abbreviation: Xinhansin Material Announcement No.: 2026-019 Jiangsu Xinhansin Material Technology Co., Ltd. 2025 Annual Report on the Performance Evaluation of the Accounting Firm The Company and all members of the Board of Directors guarantee that the information disclosed in this announcement is true, accurate, and complete, and that there are no false records, misleading statements, or material omissions. In accordance with the "Company Law of the People's Republic of China," "Securities Law of the People's Republic of China," "Corporate Governance Guidelines for Listed Companies," "Measures for the Selection and Appointment of Accounting Firms by State-owned Enterprises and Listed Companies," "Shenzhen Stock Exchange Listed Company Self-Regulatory Supervision Guide No. 2—Normative Operation of GEM Listed Companies," and the "Articles of Association," the Board of Directors' Audit Committee, based on the principle of diligence and responsibility, has conscientiously performed its duties. The report on the performance evaluation of Tianjian Certified Public Accountants LLP (hereinafter referred to as "Tianjian") by the Board of Directors' Audit Committee for 2025 is as follows: I. Basic Information of the Accounting Firm (I) Basic Information of the Accounting Firm Tianjian Certified Public Accountants LLP was established in December 1983, formerly known as Zhejiang Certified Public Accountants; it was among the first to obtain securities-related business audit qualifications in 1992; it was restructured and renamed Zhejiang Tianjian Certified Public Accountants LLP in 1998; it was restructured into Tianjian Certifi