Shangwei Co., Ltd. Announcement on Providing Guarantees for Subsidiaries

Security Code: 603333 Security Abbreviation: Shangwei Co., Ltd. Announcement No.: 2026-019

Shangwei Co., Ltd.

Announcement on Providing Guarantees for Its Controlling Subsidiary

The board of directors and all directors of this company hereby warrant that this announcement contains no false records, misleading statements, or material omissions, and assume legal responsibility for the truthfulness, accuracy, and completeness of the contents.

Key Matters to Note:

● Guarantee Target and Basic Information

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● Cumulative Guarantee Situation

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I. Overview of the Guarantee

(I) Basic Information of the Guarantee

Shangwei Co., Ltd. (hereinafter referred to as “Shangwei Co., Ltd.” or “the Company”) has recently received a notice that, due to the operational and development needs of its controlling subsidiary, Sichuan Zhongfu Taihua New Materials Technology Co., Ltd. (hereinafter referred to as “Sichuan Zhongfu Taihua”), the Company and China CITIC Bank Co., Ltd. Chengdu Branch have signed a “Maximum Amount Guarantee Contract.” In accordance with its shareholding proportion, the Company provides a joint and several liability guarantee for Sichuan Zhongfu Taihua with a maximum amount of RMB 1,989.0 million (RMB 19,890 million). Other shareholders of Sichuan Zhongfu Taihua also provide guarantees in proportion to their respective shareholding.

(II) Internal Decision-Making Procedures

On February 10, 2026, the Company convened the 7th meeting of the 6th session of the Board of Directors, at which all directors unanimously approved the “Proposal on Increasing Financial Institution Credit Lines for Controlling Subsidiaries and Providing Guarantees for Loans Within the Credit Line Limit.” The Company agreed to provide a total guarantee amount for Sichuan Zhongfu Taihua of no more than RMB 2,000.0 million (RMB 20,000 million). Other shareholders of Sichuan Zhongfu Taihua also provide guarantees in proportion to their respective shareholding. This matter shall commence implementation as of the date the Board of Directors passes it, and shall terminate on the date the Company’s 2025 annual general meeting of shareholders is held. For details, please refer to the “Resolution Announcement of the 7th Meeting of the 6th Session of the Board of Directors” (Announcement No.: 2026-005) and the “Announcement on Increasing Financial Institution Credit Lines for Controlling Subsidiaries and Providing Guarantees for Loans Within the Credit Line Limit” (Announcement No.: 2026-006) published by the Company on the Shanghai Stock Exchange website (www.sse.com.cn) and in the Company’s designated disclosure media, namely China Securities Journal, Shanghai Securities News, Securities Daily, and Securities Times.

This guarantee falls within the authorized额度范围 of the Board of Directors and does not require resubmission to the Board of Directors or the general meeting of shareholders for deliberation.

II. Basic Information of the Guaranteed Party

(I) Basic Information

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(II) The above guaranteed parties are controlling subsidiaries within the scope of the Company’s consolidated financial statements. After querying the China Judgment Online Open Information Network (

III. Main Contents of the Guarantee Agreement

1. Creditor: China CITIC Bank Co., Ltd. Chengdu Branch

2. Guarantor: Shangwei Co., Ltd.

3. Debtor: Sichuan Zhongfu Taihua

4. Guarantee Type: joint and several liability guarantee

5. Maximum Amount of Guaranteed Creditor’s Claims: RMB 1,989.0 million (RMB 19,890 million)

6. Guaranteed Creditor’s Claims: 51% of each principal creditor’s claim that the holder is entitled to under each corresponding principal contract signed by the creditor and the debtor with the main contract debtors during the period from February 12, 2026 to March 20, 2034.

7. Scope of Guarantee: the principal creditor’s claims under the main contract, interest, penalty interest, compound interest, liquidated damages, damages for breach, debtor’s interest during the period of delayed performance, delayed performance fees, costs for realizing creditor’s rights, and all other payable expenses.

8. Guarantee Period: three years from the date the performance期限 under the main contract expires

IV. Necessity and Reasonableness of the Guarantee

This guarantee is to meet Sichuan Zhongfu Taihua’s operational and development needs. There is no circumstance that would harm the interests of the Company or its minority shareholders. The guaranteed party, Sichuan Zhongfu Taihua, is a controlling subsidiary of the Company, with sound credit standing and no major matters that would affect its ability to repay debts. The Company can effectively control and manage the guaranteed party’s daily operations and major matters.

V. Board of Directors’ Opinions

On February 10, 2026, the Company convened the 7th meeting of the 6th session of the Board of Directors, at which all directors unanimously approved the “Proposal on Increasing Financial Institution Credit Lines for Controlling Subsidiaries and Providing Guarantees for Loans Within the Credit Line Limit,” agreeing to provide a total guarantee amount for Sichuan Zhongfu Taihua of no more than RMB 2,000.0 million (RMB 20,000 million). Other shareholders of Sichuan Zhongfu Taihua also provide guarantees in proportion to their respective shareholding.

VI. Total Number of External Guarantees and Number of Overdue Guarantees

1. On September 17, 2020, the Company signed a guarantee contract with Wuhu Yangzi Rural Commercial Bank Co., Ltd., providing a guarantee of RMB 50.00 million for its wholly-owned subsidiary, Anhui Shangwei Cable Co., Ltd., with the guarantee term being three years from the date the borrowing期限 under the main contract expires.

2. On November 18, 2025, the Company signed a guarantee contract with Anhui Wuwei Rural Commercial Bank Co., Ltd., providing a guarantee of RMB 30.00 million for its wholly-owned subsidiary, Anhui Shangwei Cable Co., Ltd., with the guarantee term being three years from the date the borrowing期限 under the main contract expires.

3. Given that the major shareholder of Sichuan Haichuang Shangwei New Energy Technology Co., Ltd. provided a full amount joint and several liability guarantee for its financing, the Company’s wholly-owned subsidiary, Shangwei Technology, provides a counter-guarantee for the above financing guarantee by using the 49% equity interest it holds in Sichuan Haichuang Shangwei New Energy Technology Co., Ltd.

4. On March 20, 2026, the Company signed a guarantee contract with China CITIC Bank Co., Ltd. Chengdu Branch, providing a guarantee of RMB 1,989.00 million for the controlling subsidiary Sichuan Zhongfu Taihua, with the guarantee term being three years from the date the borrowing期限 under the main contract expires.

As of March 23, 2026, the Company’s cumulative total amount of external guarantees currently in execution is RMB 5,239.00 million, accounting for 20.69% of the Company’s audited net assets for 2025. The Company has no external overdue guarantees.

This announcement is hereby issued.

Board of Directors of Shangwei Co., Ltd.

March 25, 2026

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