Yongxin Zhicheng Technology Group Co., Ltd. Announcement on Changing the Registered Public Accountant and Project Quality Reviewer

Stock Code: 688244 Stock Abbreviation: Yongxin Zhicheng Announcement No.: 2026-003

Yongxin Zhicheng Technology Group Co., Ltd.

Announcement on Changing the Registered Public Accountants and Project Quality Reviewers

The company’s board of directors and all directors guarantee that this announcement contains no false records, misleading statements, or major omissions, and assume legal responsibility for the truthfulness, accuracy, and completeness of its content.

Yongxin Zhicheng Technology Group Co., Ltd. (hereinafter referred to as “the Company”) held the fourth meeting of the fourth session of the Board of Directors on April 25, 2025, and the 2024 Annual Shareholders’ Meeting on May 20, 2025. The meeting approved the “Proposal on Reappointing the 2025 Audit Firm,” agreeing to reappoint Tianjian Certified Public Accountants LLP (hereinafter referred to as “Tianjian CPA”) as the Company’s audit firm for 2025. Details are disclosed in the “Announcement on Reappointing the 2025 Audit Firm” published on the Shanghai Stock Exchange website (www.sse.com.cn) on April 29, 2025 (Announcement No.: 2025-016).

Recently, the Company received a letter from Tianjian CPA regarding the change of signing certified public accountants and project quality reviewers. The specific details are as follows:

1. Basic information on the change of signing certified public accountants and quality control reviewers

Tianjian CPA, as the internal control audit institution for the Company’s 2025 financial statements and year-end financial report, originally appointed Wang Zhenyu and Wang Shuqin as the signing certified public accountants for the 2025 financial report and internal control audit report, and Zhang Jingjing as the project quality reviewer for the 2025 financial report and internal control audit report. Due to internal work adjustments, Huang Yao is now appointed to replace Wang Shuqin as the signing CPA, and Weng Zhigang is appointed to replace Zhang Jingjing as the project quality reviewer.

The revised signing certified public accountants are Wang Zhenyu and Huang Yao, and the project quality reviewer is Weng Zhigang.

2. Basic information of the personnel involved in the change

Huang Yao became a Chinese Certified Public Accountant in April 2020 and has been practicing at Tianjian CPA since April 2020. Huang Yao has no violations of the “China CPA Independence Standards No. 1 — Financial Statement Audit and Review Engagements and Independence Requirements” or the Chinese CPA Code of Professional Ethics regarding independence. In the past three years, Huang Yao has not been subject to criminal penalties, administrative penalties, supervisory measures, or disciplinary actions due to professional conduct.

Weng Zhigang became a Chinese Certified Public Accountant in December 2009 and has been practicing at Tianjian CPA since December 2009. Weng Zhigang has no violations of the “China CPA Independence Standards No. 1 — Financial Statement Audit and Review Engagements and Independence Requirements” or the Chinese CPA Code of Professional Ethics regarding independence. In the past three years, Weng Zhigang has not been subject to criminal penalties, administrative penalties, supervisory measures, or disciplinary actions due to professional conduct.

3. Impact on the company

The relevant work has been orderly transferred during this change, and the change will not adversely affect the company’s 2025 financial statement audit or the internal control audit of the 2025 year-end financial report.

This announcement is hereby made.

Board of Directors of Yongxin Zhicheng Technology Group Co., Ltd.

March 19, 2026