Hangzhou Haixing Electric Power Technology Co., Ltd. Progress Announcement on Repurchasing Company Shares Through Centralized Competitive Trading

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Stock code: 603556 Stock abbreviation: HAIxing Electric Announcement No.: 2026-008

Hangzhou Haixing Electric Power Technology Co., Ltd.

Progress Announcement on Repurchasing Company Shares by Using the Centralized Competitive Trading Method

The board of directors of the Company and all of its directors warrant that this announcement contains no false records, misleading statements, or material omissions, and assume individual and joint liability for the truthfulness, accuracy, and completeness of the contents.

Key Matters to Note:

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I. Basic Information on the Share Repurchase

Hangzhou Haixing Electric Power Technology Co., Ltd. (hereinafter referred to as the “Company”) convened the 4th meeting of the 5th session of the board of directors on May 26, 2025, at which the proposal on “a Share Repurchase Plan for the Company by Using the Centralized Competitive Trading Method” was considered and approved. The Company agreed to repurchase its shares by using its own funds through centralized competitive trading for the subsequent implementation of an employee shareholding plan or equity incentives. The repurchase price shall not exceed RMB 35 per share (inclusive). The total amount to be repurchased shall be no less than RMB 100 million (inclusive) and no more than RMB 200 million (inclusive). The implementation period shall be within 12 months from the date on which the board of directors approves the share repurchase plan. For details, please refer to the “Hangzhou Haixing Electric Power Technology Co., Ltd. Share Repurchase Report on Repurchasing Company Shares by Using the Centralized Competitive Trading Method” (Announcement No.: 2025-038) disclosed by the Company on May 27, 2025 in the “Shanghai Securities News” and “Securities Times” and on the website of the Shanghai Stock Exchange (www.sse.com.cn).

Due to the implementation of the 2024 annual profit distribution, the upper limit of the repurchase price for this repurchase was adjusted from no more than RMB 35.00 per share (inclusive) to no more than RMB 34.31 per share (inclusive). For details, please refer to the “Announcement on Adjusting the Upper Limit of the Repurchase Price for Shares After the Implementation of the 2024 Annual Profit Distribution by Hangzhou Haixing Electric Power Technology Co., Ltd.” (Announcement No.: 2025-044) disclosed by the Company on June 18, 2025.

II. Progress of the Share Repurchase

In accordance with the relevant provisions of the “Share Repurchase Rules for Listed Companies” and the “No. 7 Self-Regulatory Guidance for Listed Companies of the Shanghai Stock Exchange—Share Repurchases,” during the share repurchase period, the Company shall announce the progress of its share repurchase as of the end of the previous month within the first three trading days of each month. The progress of the Company’s share repurchase is hereby announced as follows:

In March 2026, the Company did not execute any share repurchase. As of March 31, 2026, the Company has cumulatively repurchased 4,917,180 shares of the Company through centralized competitive trading, representing 1.01% of the Company’s total share capital. The highest transaction price for the repurchased shares was RMB 28.76 per share, and the lowest transaction price was RMB 26.20 per share. The total amount paid was RMB 133,650,988.40 (excluding transaction fees). The above repurchased shares comply with applicable laws and regulations, regulatory documents, and the Company’s share repurchase plan.

III. Other Matters

The Company will strictly comply with the “Share Repurchase Rules for Listed Companies,” the “No. 7 Self-Regulatory Guidance for Listed Companies of the Shanghai Stock Exchange—Share Repurchases,” and other relevant provisions. Within the repurchase period, the Company will make and implement repurchase decisions as appropriate based on market conditions. Meanwhile, it will promptly fulfill its information disclosure obligations in accordance with the progress of the share repurchase matter. Investors are kindly requested to pay attention to investment risks.

This announcement is hereby issued.

Board of Directors of Hangzhou Haixing Electric Power Technology Co., Ltd.

April 2, 2026

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