Securities Code: 300675
Securities Abbreviation: Jian Keyuan
Special Report 1
Evaluation Report on the Performance of the Audit Institution for the Year 2025
Approved by the second extraordinary general meeting of shareholders of Shenzhen Institute of Building Science Co., Ltd. (hereinafter referred to as the "Company") in 2025, the Company appointed Lixin Certified Public Accountants (Special General Partnership) (hereinafter referred to as "Lixin") as the audit institution for the year 2025. Lixin will provide financial statement audit and internal control audit services for the Company’s 2025 financial statements and issue standard unqualified audit reports for both the financial statements and internal control audits.
In accordance with the "Management Measures for the Appointment of Accounting Firms by State-owned Enterprises and Listed Companies," and based on the supervision by the Board of Directors' Audit Committee over Lixin, the audit situation, basic information about the audit institution, implementation of audit projects, and performance evaluation (see attachment), the Company assessed Lixin's performance. The assessment concluded that Lixin conducted the audit work independently, diligently, and responsibly, reaching consensus with the Company on all significant accounting audit matters, effectively fulfilling the responsibilities of the audit institution, and issuing objective, truthful, and complete audit reports.
This report is hereby issued.
Attachment: Basic information about Lixin, implementation of audit projects, performance evaluation of the audit institution.
Shenzhen Institute of Building Science Co., Ltd. Board of Directors
March 21, 2026
Special Report 2
Attachment: Basic Information, Implementation of Audit Projects, and Performance Evaluation of Lixin Certified Public Accountants (Special General Partnership)
Basic Information of the Audit Institution
Qualification Conditions
Lixin Certified Public Accountants (Special General Partnership) (hereinafter referred to as "Lixin") was founded in 1927 in Shanghai by the accounting master Dr. Pan Xulun. It was re-established in 1986 and became the first special general partnership accounting firm in China to complete its restructuring in 2010. Its registered address is on the fourth floor of No. 61 Nanjing East Road, Huangpu District, Shanghai, with Mr. Zhu Jiandi as the chief partner. Lixin is a member of the international accounting network BDO and has long been engaged in securities services. Before the implementation of the new Securities Law, it held licenses for securities and futures business and has H-share audit qualifications, having registered with the Public Company Accounting Oversight Board (PCAOB) in the United States.
As of the end of 2025, Lixin had 300 partners, 2,523 certified public accountants, and a total of 9,933 employees, with 802 certified public accountants having signed audit reports for securities services. Lixin's business revenue for 2025 (unaudited) was 5 billion yuan, of which audit business revenue was 3.672 billion yuan, and securities business revenue was 1.505 billion yuan. In 2025, Lixin provided annual report audit services for 770 listed companies, with audit fees totaling 916 million yuan, and had 11 audit clients in the same industry.
Investor Protection Capability
As of the end of 2025, Lixin had set aside a professional risk fund of 171 million yuan and purchased professional liability insurance with a cumulative compensation limit of 1.05 billion yuan, which covers civil liability arising from audit failures.