Beijing Haibosi Chuangke Technology Co., Ltd. Prompt Announcement on Changes in the Equity of Shareholders Holding Over 5% and Their Concerted Parties Reaching the 1% Threshold

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Securities Code: 688411 Stock Abbreviation: Haibo Sichuang Announcement No.: 2026-004

Beijing Haibo Sichuang Technology Co., Ltd.

Notice of Changes in Shareholder Rights for Shareholders Holding Over 5% and Their Concerted Parties Reaching 1% Threshold

Investors and their concerted parties, Suzhou Qiming Integration Venture Capital Partnership (Limited Partnership) (hereinafter referred to as “Qiming Integration”) and QM10 Limited (hereinafter referred to as “QM10”), guarantee 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 information disclosure obligor.

Important Content Reminder:

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1. Basic Information of the Information Disclosure Obligor and Its Concerted Parties

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(1) Identity Category

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(2) Information of the Information Disclosure Obligor

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2. Basic Situation of Rights Changes Reaching 1%

On March 13, 2026, Beijing Haibo Sichuang Technology Co., Ltd. (hereinafter referred to as “the Company”) received a notification letter from Qiming Integration and QM10 regarding the change in shareholding rights reaching 1%.

On March 13, 2026, Qiming Integration and QM10, through centralized bidding trading, collectively reduced their holdings of the company’s shares by 1,234,863 shares, accounting for 0.69% of the total share capital. The combined shareholding ratio of Qiming Integration and QM10 changed from 6.02% to 5.33%, crossing the 1% threshold. The specific details are as follows:

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Note: Some totals may differ slightly from the sum of individual figures due to rounding.

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3. Other Explanations

4. This rights change is part of Qiming Integration and QM10 fulfilling their previously disclosed reduction plans. For details, please refer to the “Announcement on the Share Reduction Plan of Shareholders Holding Over 5% and Their Concerted Parties of Beijing Haibo Sichuang Technology Co., Ltd.” published by the company on February 12, 2026, on designated information disclosure media and the Shanghai Stock Exchange website (www.sse.com.cn) (Announcement No.: 2026-002). This reduction does not involve a takeover bid and is consistent with the plans and commitments previously disclosed by the information disclosure obligors.

5. This rights change will not result in a change of the company’s controlling shareholder or actual controller, nor will it have a significant impact on the company’s governance structure or ongoing operations.

6. This rights change does not involve the disclosure of a rights change report by the information disclosure obligor.

7. After this rights change, the information disclosure obligor remains within its reduction plan period. The company will continue to supervise its strict implementation of reduction regulations and will fulfill its information disclosure obligations promptly based on subsequent shareholding changes.

This announcement is hereby made.

Board of Directors of Beijing Haibo Sichuang Technology Co., Ltd.

March 17, 2026