Hangzhou Silan Microelectronics Co., Ltd. Progress Announcement on Providing Daily Guarantees for Subsidiaries

Stock Code: 600460 Stock Abbreviation: Shilan Micro Notice No.: Lin 2026-009

Hangzhou Shilan Microelectronics Co., Ltd.

Progress Announcement on the Provision of Ongoing Guarantees for the Daily Operations of Wholly-Owned Subsidiaries

The board of directors of the Company and all directors hereby guarantee that there are no false records, misleading statements, or material omissions in the contents of this announcement, and assume legal responsibility for the authenticity, accuracy, and completeness of the contents.

Key Points:

● Guarantee Parties 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

From March 1, 2026 to March 31, 2026, within the Company’s annual estimated ongoing guarantee limits, the guarantee contracts actually signed by Hangzhou Shilan Microelectronics Co., Ltd. (hereinafter referred to as the “Company” or “our Company”) are as follows:

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The above guarantees do not involve any counter-guarantee. The above guarantees are not related-party guarantees. Other shareholders of the guaranteed parties did not provide guarantees.

(II) Internal Decision-Making Procedures

The Company’s 32nd meeting of the Eighth Session of the Board of Directors held on April 17, 2025 and the 2024 annual general meeting of shareholders held on June 12, 2025 considered and approved the “Proposal on Providing Ongoing Guarantee Credit Lines to Subsidiaries in 2025.” It was agreed that the Company would provide, in 2025, a total ongoing guarantee credit line not exceeding RMB 2.9 billion for the Company’s major wholly-owned subsidiaries and controlling subsidiaries with an asset-liability ratio below 70%. When ongoing guarantees actually occur, within the total ongoing guarantee credit line estimated above, the Company may cross-adjust among different controlling subsidiaries with an asset-liability ratio below 70% (including controlling subsidiaries newly added or newly established in mid-year). The estimated amount of this guarantee includes the balance of ongoing guarantees from prior years that carries over into 2025. The estimated guarantee limit is valid for 12 months from the date of approval by the 2024 annual general meeting of shareholders. If the time interval between the 2025 annual general meeting of shareholders and the 2024 annual general meeting of shareholders exceeds 12 months, prior to the convening of the 2025 annual general meeting of shareholders, the guarantees made by our Company within the total guarantee limit for the above wholly-owned subsidiaries and controlling subsidiaries remain valid. The general meeting also authorized the Chairman, Mr. Chen Xiangdong, to approve specific guarantee matters and sign relevant legal documents. For details, please refer to the relevant announcements disclosed by the Company on April 19, 2025 and June 13, 2025 on the website of the Shanghai Stock Exchange (www.sse.com.cn), with announcement numbers Lin 2025-008, Lin 2025-014, and Lin 2025-028.

Within the scope of the guarantee limits approved by the above general meeting, no additional convening of the board of directors meeting and the general meeting of shareholders is required for deliberation.

(III) As of March 31, 2026:

1. The guarantees provided by the Company for Shilan Jixin and Chengdu Jiajia are all ongoing guarantees. The outstanding guarantee balance actually provided by the Company for Shilan Jixin is RMB 76,712.00 thousand, and the outstanding guarantee balance actually provided for Chengdu Jiajia is RMB 16,100.00 thousand.

2. The Company’s ongoing guarantee balance is RMB 160,597.92 thousand, and the remaining available guarantee limit is RMB 129,402.08 thousand; the guarantee balance falls within the annual estimated ongoing guarantee limits approved by the Company’s 2024 annual general meeting of shareholders.

II. Basic Information of the Guaranteed Parties

(I) Basic Information

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(II) Both Shilan Jixin and Chengdu Jiajia are the Company’s controlling subsidiaries. They have not been listed as persons subject to enforcement for dishonesty, and there are no major contingent matters that could affect their ability to repay debts.

III. Main Contents of the Guarantee Agreement

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The above guarantees do not involve any counter-guarantee. The above guarantees are not related-party guarantees.

IV. Necessity and Reasonableness of the Guarantee

The purpose of this guarantee is to meet the funding needs for the daily production and operation of the above controlling subsidiaries, which is conducive to the development of the Company’s main business; the production and operation of the guaranteed parties is stable, their credit standing is good, and they have the ability to repay debts; the Company’s guarantees are mainly credit-enhancement measures required by the lenders, and the risk of triggering guarantee liability is controllable.

All guaranteed parties are controlling subsidiaries within the scope of the Company’s consolidated financial statements. The Company has control over their business operations, financial matters, and so on, and can timely understand their credit status and performance ability. The guarantee risk is within a range that the Company can control and will not have a significant impact on the Company’s normal business activities. The other shareholders of the guaranteed party Shilan Jixin are Ji Hua Investment and Shilan Integration; both are controlling subsidiaries of the Company. The guaranteed party Chengdu Jiajia is the Company’s controlling subsidiary, Chengdu Shilan’s wholly-owned subsidiary. The other shareholders of Chengdu Shilan are mainly professional industrial investment funds for financial investment and industrial support; their shareholding proportions are relatively small, and they do not participate in its daily operations. There is currently no obvious necessity for them to provide guarantees. Therefore, other shareholders have not provided guarantees on a pro-rata basis, which does not violate the principle of fairness and reciprocity.

This guarantee matter complies with relevant laws and regulations, normative documents, and the Articles of Association, and there is no circumstance that would damage the interests of the Company and its shareholders.

V. Opinions of the Board of Directors

The “Proposal on Providing Ongoing Guarantee Credit Lines to Subsidiaries in 2025” was deliberated and approved at the 32nd meeting of the Eighth Session of the Board of Directors held on April 17, 2025 and the 2024 annual general meeting of shareholders held on June 12, 2025. For details, please refer to the relevant announcements disclosed by the Company on April 19, 2025 and June 13, 2025 on the website of the Shanghai Stock Exchange (www.sse.com.cn), with announcement numbers Lin 2025-008, Lin 2025-014, and Lin 2025-028.

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

As of the date of disclosure of this announcement, the total amount of external guarantees approved by the Company and its controlling subsidiaries is RMB 5.2482 billion, representing 42.96% of the Company’s net assets attributable to the latest audited period; among them: the total amount of guarantees provided by the Company to its controlling subsidiaries is RMB 4.2374 billion, representing 34.69% of the Company’s net assets attributable to the latest audited period; the total amount of guarantees provided by the Company for Xiamen Shilan Ke Microelectronics Co., Ltd. in which it holds a minority stake is RMB 1.0108 billion, representing 8.27% of the Company’s net assets attributable to the latest audited period. Neither the Company nor its controlling subsidiaries has any overdue external guarantees. (Note: The total guarantee amount includes the sum of the approved guarantee limits not yet utilized and the actual outstanding balance of guarantees that have occurred.)

This is hereby announced.

Hangzhou Shilan Microelectronics Co., Ltd.

Board of Directors

April 3, 2026

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