Beijing Yandong Microelectronics Co., Ltd. Simplified Report on Changes in Equity

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Listing Company Name: Beijing Yandong Microelectronics Co., Ltd.

Stock Listing Location: Shanghai Stock Exchange

Stock Abbreviation: Yandong Micro

Stock Code: 688172

Name of Information Disclosure Obligation Person: Beijing Yizhuang International Investment Development Co., Ltd.

Address: 25th Floor, Building 1, No. 22 Ronghua Middle Road, Beijing Economic and Technological Development Zone, Beijing

Mailing Address: 25th Floor, Building 1, No. 22 Ronghua Middle Road, Beijing Economic and Technological Development Zone, Beijing

Nature of Shareholder Change: Share reduction

Signing Date: March 2026

Declaration of the Information Disclosure Obligation Person

1. This report is prepared in accordance with the Securities Law of the People’s Republic of China, the Administrative Measures for the Acquisition of Listed Companies, the Guidelines for Content and Format of Information Disclosure by Publicly Issued Securities Companies No. 15—Equity Changes Report, and other relevant laws, regulations, and departmental rules.

2. The signer of this report has obtained necessary authorization and approval, and its performance does not violate any provisions of the articles of association or internal rules of the obligation person, nor conflicts with them.

3. According to the Securities Law of the People’s Republic of China, the Administrative Measures for the Acquisition of Listed Companies, and the Guidelines for Content and Format of Information Disclosure by Publicly Issued Securities Companies No. 15—Equity Changes Report, this report fully discloses the equity change situation of the obligation person in Beijing Yandong Microelectronics Co., Ltd.

As of the signing date of this report, except for the information disclosed herein, the obligation person has not increased or decreased its equity holdings in Beijing Yandong Microelectronics Co., Ltd. through any other means.

4. The equity change in this report is based on the information contained herein. Except for the obligation person, no other person has been entrusted or authorized to provide information not listed in this report or to make any explanations or statements about this report.

5. The obligation person promises that this report does not contain false records, misleading statements, or major omissions, and bears individual and joint legal responsibility for the authenticity, accuracy, and completeness of its content.

Section 1 Definitions

Unless otherwise indicated, the following terms have the following meanings in this report:

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Section 2 Introduction of the Obligation Person

1. Basic information of the obligation person

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2. Shareholder information of the obligation person

As of the signing date of this report, the shareholder situation of Yizhuang Guotou is as follows:

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As of the signing date of this report, the largest shareholder of Yizhuang Guotou is the Beijing Finance and State-owned Assets Bureau of the Beijing Economic and Technological Development Zone.

3. Directors and main responsible persons of the obligation person

As of the signing date of this report, according to industrial and commercial disclosure information, the basic situation of directors and main responsible persons of Yizhuang Guotou is as follows:

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4. The situation where the obligation person holds equity interests in other listed companies within China and abroad, reaching or exceeding 5% of the company’s issued shares

As of the signing date of this report, except for Yandong Micro, Yizhuang Guotou does not hold equity interests in other listed companies within China or abroad that reach or exceed 5% of the company’s issued shares.

Section 3 Purpose of Equity Change and Shareholding Plan

1. Purpose of this equity change

This equity change is due to the obligation person’s own operational management needs, actively reducing its holdings of company shares through centralized bidding or block trades.

2. Whether there is an intention to increase or continue reducing its equity holdings in the listed company within the next 12 months

The obligation person does not rule out increasing or decreasing its equity holdings in the listed company within the next 12 months in compliance with relevant laws, regulations, and normative documents, based on its actual situation. If relevant equity change matters occur, the obligation person will strictly perform its disclosure obligations in accordance with relevant laws and regulations.

Section 4 Method of Equity Change

1. Method of this equity change

This change is executed via centralized bidding transactions: the obligation person reduces its holdings of the listed company’s shares.

This change will not result in a change of control of Yandong Micro.

2. Basic information of this equity change by the obligation person

After this change, the obligation person’s shareholding ratio in the listed company decreases from 10.83% to 10.00%, with specific details as follows:

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3. Shareholding status before and after this change

Before this change, the obligation person held 154,636,709 shares of Yandong Micro, accounting for 10.83% of the total share capital. After the change (as of the signing date of this report), the obligation person holds 142,761,809 shares, accounting for 10.00%. The shareholding situation before and after the change is as follows:

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4. Whether there are any restrictions on the rights of the equity interests held by the obligation person in the company

As of the signing date of this report, the equity interests held by the obligation person in the company are not subject to any other rights restrictions, including but not limited to pledge or freezing.

Section 5 Trading of Listed Shares in the Past 6 Months

Within six months prior to the signing of this report, the obligation person reduced its holdings of company shares through the Shanghai Stock Exchange’s trading system as follows:

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Apart from the above disclosed reductions, within six months prior to the signing of this report, the obligation person has not engaged in other buying or selling of company shares.

Section 6 Other Major Matters

As of the signing date of this report, the obligation person has truthfully disclosed all relevant information regarding this equity change in accordance with relevant regulations, and there are no other major information that the obligation person should disclose but has not disclosed according to laws and regulations.

Section 7 Obligation Person’s Declaration

The company promises that this report does not contain false records, misleading statements, or major omissions, and bears individual and joint legal responsibility for its authenticity, accuracy, and completeness.

Name of the obligation person:

Beijing Yizhuang International Investment Development Co., Ltd.

(Seal)

Legal Representative Signature: _____________

Chen Zhicheng

March 19, 2026

Section 8 Reference Documents

This report and the following reference documents are available for inspection at the company’s address and at the Shanghai Stock Exchange:

1. Legal business license of the obligation person;

2. List of directors and main responsible persons of the obligation person, along with their identification documents;

3. The signed copy of this report by the obligation person;

4. Other reference documents required by the China Securities Regulatory Commission or the exchange;

5. Location for storing reference documents: Beijing Yandong Microelectronics Co., Ltd.

(No further text)

Appendix: Short Form Equity Change Report

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Obligation person name: Beijing Yizhuang International Investment Development Co., Ltd.

Legal Representative Signature: _____________

Chen Zhicheng

March 19, 2026

Securities Code: 688172 Stock Abbreviation: Yandong Micro Announcement No.: 2026-017

Yandong Micro: Notice of Equity Change of Shareholders Holding Over 5% to 10% and Reminder of Crossing 1% Threshold

The shareholder Beijing Yizhuang International Investment Development Co., Ltd. guarantees that the information provided to the company is true, accurate, and complete, with no false records, misleading statements, or major omissions.

The company’s board of directors and all directors guarantee that the announcement content is consistent with the information provided by the obligation person.

Key Highlights:

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1. Basic information of the obligation person and its concerted action persons

2. Identity category

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2. Information of the obligation person

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3. Information of concerted action persons

The obligation person has no concerted action persons.

2. Basic situation of equity change reaching the 1% threshold

On March 19, 2026, Beijing Yandong Microelectronics Co., Ltd. received the “Notice of Equity Change Ratio Reaching the 10% Threshold” and the “Short Form Equity Change Report” from shareholder Beijing Yizhuang International Investment Development Co., Ltd.

Between March 4 and March 18, 2026, the obligation person reduced a total of 11,874,900 unrestricted circulating shares via centralized bidding, accounting for 0.83% of the total share capital. The shareholding ratio decreased from 10.83% to 10.00%, crossing the 1% threshold. Details are as follows:

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3. Additional notes

4. This equity change is part of the shareholder’s previously disclosed share reduction plan, detailed in the “Shareholder Holding Over 5% of Shares Reduction Plan Announcement” published on January 30, 2026, on the Shanghai Stock Exchange (Announcement No.: 2026-007). As of the date of this announcement, the plan has not yet been fully implemented.

5. This reduction is a normal share reduction by a shareholder holding over 5%, not affecting the company’s controlling shareholder or actual controller, nor significantly impacting corporate governance or ongoing operations.

6. The reduction complies with the “Shanghai Stock Exchange Sci-Tech Board Stock Listing Rules,” “Interim Measures for Shareholder Reduction of Listed Companies,” and the “Shanghai Stock Exchange Listed Companies Self-Regulatory Guidelines No. 15—Shareholder and Senior Management Share Reduction,” among other laws and regulations, with no violations.

7. This equity change involves the obligation person disclosing a short form equity change report, details of which are published on the Shanghai Stock Exchange website on the same date.

8. The company will continue to strictly follow relevant regulations, fulfill its disclosure obligations promptly, and investors are advised to be aware of investment risks.

This announcement is made by Beijing Yandong Microelectronics Co., Ltd.

Board of Directors

March 20, 2026