Securities code: 688002 Securities abbreviation: Ruichuang Micro-Nano Announcement No.: 2025-021

Convertible bond code: 118030 Convertible bond abbreviation: Ruichuang convertible bond

Yantai Ruichuang Micro-Nano Technology Co., Ltd

Announcement on the renewal of the appointment of the accounting firm

The board of directors and all directors of the company guarantee that there are no false records, misleading statements or material omissions in the content of this announcement, and assume legal responsibility for the authenticity, accuracy and completeness of its content in accordance with the law.

Important Content Notes:

Name of Accounting Firm to be Appointed: Baker Tilly International Accounting Firm (Special General Partnership)

(hereinafter referred to as "Baker Tilly International")

1. The basic information of the accounting firm to be employed

(1) Institutional information

1. Basic information

Name: Baker Tilly International Accounting Firm (Special General Partnership)

Founded: December 1988

Form of organization: special general partnership

Registered address: A-1 and A-5, Building 68, No. 19, Chegongzhuang West Road, Haidian District, Beijing

Senior Partner: Mr. Qiu Jingzhi

2. Personnel information

As of December 31, 2023, Baker Tilly has 89 partners, 1,165 certified public accountants, and 414 certified public accountants who have signed audit reports on securities service business.

3. Business scale

Baker Tilly International's total audited revenue in 2023 is 3.197 billion yuan, and the audit business income is 2.641 billion yuan.

The income from securities business was 1.287 billion yuan. In 2023, there will be 263 audit clients of listed companies, and the main industries (CSRC

Industries, the same below) including manufacturing, information transmission, software and information technology services, electricity, heat, gas and water production and supply, wholesale and retail, transportation, warehousing and postal services, etc., with a total audit fee of 319 million yuan, and 158 audit clients of listed companies in the same industry of the company.

4. Investor protection capabilities

In accordance with relevant laws and regulations, Baker Tilly International has accumulated sufficient amounts of occupational risk funds in previous years, and the cumulative compensation limit of the occupational risk funds and occupational insurance purchased shall not be less than RMB 20,000,000. duty

The provision of occupational risk funds and the purchase of occupational insurance are in accordance with relevant regulations. In the past three years (2022, 2023, 2024 and early 2025 to the date of this announcement, the same below), Baker Tilly International has not borne civil liability in relevant civil litigation due to its professional conduct.

5. Integrity record

In the past three years, Baker Tilly International has received 0 criminal penalties, 1 administrative penalty, 9 supervision and management measures, 7 self-regulatory measures and 3 disciplinary actions for its professional behavior. In the past three years, practitioners have received 1 administrative punishment, 10 supervision and management measures, 3 self-discipline and supervision measures, and 4 disciplinary sanctions for their professional conduct, involving 37 personnel, and there is no criminal punishment for their professional conduct.

(2) Information of project members

1. Personnel information

The basic information of the project partner, the signatory certified public accountant, and the project quality control reviewer is as follows:

Project partner and signatory CPA 1: He Hang, became a certified public accountant in 2014, began to engage in the audit of listed companies in 2011, began to practice in the firm in 2014, began to provide audit services for the company in 2025, signed 2 audit reports of listed companies in the past three years, and reviewed 3 audit reports of listed companies in the past three years.

Signing CPA 2: Meng Xiangrui, became a certified public accountant in 2017, began to engage in the audit of listed companies in 2016, began to practice in the firm in 2017, began to provide audit services for the company in 2022, and signed 3 audit reports of listed companies in the past three years.

Project quality control reviewer: Qin Jiwei, became a certified public accountant in 1995 and began to engage in it in 2009

Audits of listed companies, began to practice in the firm in 2010, began to provide audit services for the company in 2024, signed 3 audit reports of listed companies in the past three years, and reviewed 4 audit reports of listed companies in the past three years.

2. The integrity records of the above-mentioned personnel

In the past three years, the project partners, signatory certified public accountants, and project quality control reviewers have not been subject to criminal penalties for their professional behaviors, administrative penalties, supervision and management measures by the China Securities Regulatory Commission, its dispatched agencies, industry authorities, etc., and self-regulatory measures and disciplinary actions by self-regulatory organizations such as stock exchanges and industry associations.

(3) Audit fees

Baker Tilly International Audit Service Fees are determined based on factors such as the degree of responsibility, complexity of the business, the requirements of the work, the required working conditions and working hours, and the professional knowledge and work experience of the staff at all levels who actually participate in the business. The company's audit fee for 2025 is RMB 1.4 million (including: annual report audit fee of RMB 1.2 million; The internal control audit fee is 200,000 yuan).

2. The procedures to be performed by the accounting firm to be re-engaged

(1) The deliberations of the Audit Committee of the Board of Directors

On April 8, 2025, the Company held the first meeting of the Audit Committee of the Board of Directors in 2025, and deliberated and approved the Proposal on Hiring the Company's 2025 Financial Report Auditor and Internal Control Auditor. In view of the fact that Baker Tilly International Accounting Firm (Special General Partnership) strictly abides by the practice standards of independence, objectivity and impartiality in the company's 2024 audit work, performs its audit duties, and completes the company's audit work, it is agreed to continue to appoint Baker Tilly International Accounting Firm (Special General Partnership) as the 2025 financial report auditor and internal control auditor, and submit it to the board of directors for deliberation.

(2) Deliberations of the Board of Directors

On April 10, 2025, the company held the 24th meeting of the third board of directors, deliberated and approved the "Proposal on Hiring the Company's 2025 Financial Report Auditor and Internal Control Auditor", and agreed that the company will continue to hire Baker Tilly International Accounting Firm (special general partnership) as the company's 2025 financial report audit institution and internal control audit institution, and submit it to the company's 2024 annual general meeting of shareholders for deliberation.

(3) The matter of re-appointment of the accounting firm still needs to be submitted to the general meeting of shareholders of the company for deliberation, and will take effect from the date of deliberation and approval of the general meeting of shareholders of the company.

The announcement is hereby made.

Yantai Ruichuang Micro-Nano Technology Co., Ltd

board of directors

April 11, 2025