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

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

Stock Listing Location: Shanghai Stock Exchange

Stock Abbreviation: Yandong Micro

Stock Code: 688172

Information Disclosure Obligor Name: 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 by the Information Disclosure Obligor

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 Information Disclosure of Publicly Issued Securities No. 15—Equity Changes, and other relevant laws, regulations, and departmental rules.

2. The signer of this report has obtained the necessary authorization and approval, and its execution does not violate any provisions of the articles of association or internal rules of the obligor, 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 Information Disclosure of Publicly Issued Securities No. 15—Equity Changes, this report fully discloses the equity change of the obligor in Beijing Yandong Microelectronics Co., Ltd.

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

5. The equity change in this report is based on the information contained herein. No other persons have been entrusted or authorized to provide information not listed in this report or to make any explanations or statements about this report.

6. The obligor promises that this report contains no false records, misleading statements, or major omissions, and bears individual and joint legal responsibility for the truthfulness, accuracy, and completeness of its content.

Section 1: Definitions

In this report, unless otherwise specified, the following terms have the meanings ascribed below:

Section 2: Introduction of the Obligor

1. Basic information of the obligor

2. Shareholder information of the obligor

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

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

3. Directors and key responsible persons of the obligor

As of the signing date of this report, based on industrial and commercial disclosure information, the basic information of Yizhuang Guotou’s directors and key responsible persons is as follows:

4. The situation where the obligor holds equity interests in other listed companies within China and abroad, reaching or exceeding 5% of the issued shares of those companies

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 their issued shares.

Section 3: Purpose of Equity Change and Shareholding Plan

1. Purpose of this equity change

This equity change is due to the obligor’s operational management needs, actively reducing its holdings of the company’s 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 obligor does not rule out the possibility of 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 changes occur, the obligor will strictly perform its disclosure obligations in accordance with applicable laws and regulations.

Section 4: Method of Equity Change

1. Method of this equity change

The method of this equity change is: the obligor reduces its holdings of the listed company’s shares through centralized bidding transactions.

This change will not affect the control rights of Yandong Micro.

2. Basic information about this equity change by the obligor

After this change, the obligor’s shareholding ratio in the listed company decreases from 10.83% to 10.00%. The specific details are as follows:

3. Shareholding status before and after this equity change

Before the change, the obligor 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 obligor holds 142,761,809 shares, accounting for 10.00%. The shareholding situation before and after the change is as follows:

4. Whether there are any restrictions on the rights of the shares held by the obligor in the company

As of the signing date of this report, the shares held by the obligor in the company are not subject to any restrictions on rights, including but not limited to pledge or freezing.

Section 5: Trading of Listed Shares in the Past 6 Months

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

Apart from the disclosed reduction, the obligor has not engaged in any other buying or selling of the company’s shares in the past six months.

Section 6: Other Major Matters

As of the signing date of this report, the obligor has truthfully disclosed all relevant information regarding this equity change in accordance with regulations. There are no other major undisclosed information required by law or regulations.

Section 7: Obligor’s Declaration

The company promises that this report contains no false records, misleading statements, or major omissions, and bears individual and joint legal responsibility for its authenticity, accuracy, and completeness.

Obligor Name:

Beijing Yizhuang International Investment Development Co., Ltd.

(Seal)

Legal Representative Signature: _____________

Chen Zhicheng

March 19, 2026

Section 8: Reference Documents

The report and the following reference documents can be inspected at the company’s address and the Shanghai Stock Exchange:

1. Legal business license of the obligor;

2. List of directors and key responsible persons of the obligor, along with their identification documents;

3. The signed copy of this report by the obligor;

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

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

Appendix: Summary Equity Change Report

Obligor Name: Beijing Yizhuang International Investment Development Co., Ltd.

Legal Representative Signature: _____________

Chen Zhicheng

March 19, 2026

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

Yandong Micro: Announcement on Equity Change of Shareholders Holding More Than 5% and Reaching 10% and the 1% Threshold

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 content of this announcement is consistent with the information provided by the obligor.

Key Content Highlights:

1. Basic information of the obligor and its concerted action persons

2. Category of identity

3. Information of the obligor

4. Information of concerted action persons

The obligor 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 a notification letter and a summary equity change report from shareholder Beijing Yizhuang International Investment Development Co., Ltd. regarding the equity change reaching the 10% threshold.

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

3. Other explanations

4. This equity change is part of the shareholder’s previously disclosed share reduction plan, detailed in the “Shareholder Holding More Than 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 completed.

5. This normal reduction by a shareholder holding more than 5% but not the largest shareholder will not change the company’s controlling shareholder or actual controller, nor will it significantly impact the company’s governance or ongoing operations.

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

7. This equity change involves the obligor’s disclosure of a summary equity change report. Details are available in the same-day published “Summary Equity Change Report” on the Shanghai Stock Exchange website (www.sse.com.cn).

8. The company will continue to strictly follow relevant regulations, timely disclose information, and investors are advised to be aware of investment risks.

This announcement is hereby made.

Board of Directors of Beijing Yandong Microelectronics Co., Ltd.

March 20, 2026