Zhejiang Southeast Space Frame Co., Ltd. Progress Announcement on the Progress of Providing Guarantees for Subsidiaries

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Security code: 002135 Stock abbreviation: DONGNAN Netting Announcement No.: 2026-021

Bond code: 127103 Bond abbreviation: DONGNAN Convertible Bonds

Zhejiang Dongnan Netting Co., Ltd.

Progress Announcement on the Provision of Guarantees for Subsidiaries

The Company and all members of the board of directors warrant that the information disclosed in this announcement is true, accurate, and complete, and contains no false records, misleading statements, or material omissions.

I. Overview of the Guarantee

(I) Basic circumstances of this guarantee

Recently, Zhejiang Dongnan Netting Co., Ltd. (hereinafter referred to as the “Company”)’s wholly owned subsidiary, Zhejiang Dongnan Carbon Neutral Science and Technology Co., Ltd. (hereinafter referred to as “Dongnan Carbon Neutral”), applied to China Development Bank New Policy-Based Financial Instrument Co., Ltd. (hereinafter referred to as “China Development Bank Financial”) for a RMB 50,000,000 loan to build a 110MW ground-mounted photovoltaic power plant project in the Pudang Town of Xiaoshan District, Zhejiang Xingneng Technology Co., Ltd. (110MW). The loan funds are intended to be injected into Zhejiang Xingneng Technology Co., Ltd. in the form of equity funds through Zhejiang Dongnan Carbon Neutral Science and Technology Co., Ltd., for the project’s capital contribution. The Company agrees to provide a joint liability guarantee for the debts such as the loan amount and corresponding interest, default damages, damages for breach, and fees for realizing the creditor’s claims, etc., owed by the wholly owned subsidiary Dongnan Carbon Neutral for the above-mentioned loan.

(II) Internal approval procedures for this guarantee matter

At the 30th meeting of the eighth session of the board of directors held on March 10, 2026, and the first extraordinary general meeting of shareholders held in 2026 on March 27, 2026, the Company reviewed and approved the “Proposal on the Estimated Amount of External Guarantee Quotas for the Company for 2026,” under which the Company agreed to provide, for subsidiaries (including sub-subsidiaries) within the scope of consolidated financial statements, a total guarantee quota not exceeding RMB 680,000,000, of which the guarantee quota for its subordinate subsidiaries with an asset-liability ratio of 70% or above (inclusive) shall not exceed RMB 445,000,000, and the guarantee quota for its subordinate subsidiaries with an asset-liability ratio below 70% shall not exceed RMB 235,000,000. The scope of guarantees includes, but is not limited to, financing businesses such as applications for comprehensive credit facilities, loans, bank acceptances, letters of credit, factoring, performance bonds, and finance leasing. The methods of guarantees include guarantee, mortgage, pledge, etc. The above-mentioned guarantee quotas include newly added guarantees as well as extensions or renewals of existing guarantees; the actual guaranteed amount shall be subject to the final guarantee contract to be signed. The validity period is 12 months from the date on which this matter is approved by the general meeting of shareholders. For details, please refer to the “Announcement on the Estimated Amount of External Guarantee Quotas for the Company for 2026” (Announcement No.: 2026-012) published on March 11, 2026 in the Securities Times, China Securities Journal, Shanghai Securities News, Securities Daily, and Juchao Information Network ( http://www.cninfo.com.cn ).

The amount of this guarantee falls within the guarantee quota range approved by the Company’s shareholders’ meeting, and this matter does not need to be submitted to the board of directors and the shareholders’ meeting for approval.

II. Utilization of the Guarantee Quota

For 2026, the Company expects the total guarantee amount for its subsidiaries to be no more than RMB 680,000,000. This guarantee is within the guarantee quota range approved by the Company’s shareholders’ meeting.

After this guarantee actually occurs, the Company’s available guarantee quota for its subsidiaries is RMB 675,000,000, and the Company’s remaining available guarantee quota for Dongnan Carbon Neutral is RMB 25,000,000.

III. Basic information of the guaranteed party

The basic information of the guaranteed parties involved in this guarantee is as follows:

1、Company name: Zhejiang Dongnan Carbon Neutral Science and Technology Co., Ltd. (hereinafter referred to as “Dongnan Carbon Neutral”)

Date of establishment: March 30, 2021

Registered capital: RMB 50,000,000

Registered address: No. 89-1, 8th Avenue, High-tech Zone, Qiaonan Block, Xiaoshan Economic and Technological Development Zone, Xiaoshan District, Hangzhou, Zhejiang

Legal representative: Wang Dongjian

Business scope: General projects: research and development of emerging energy technologies; engineering and technology research and experimental development; solar power generation technology services; sales of solar thermal power products; manufacturing of photovoltaic equipment and components; sales of photovoltaic equipment and components; leasing of photovoltaic power generation equipment; research and development of electronic-specific materials; manufacturing of electronic-specific materials; sales of electronic-specific materials; sales of electrical machinery and equipment; repair of electrical equipment; contract energy management (except for projects subject to approval according to law, the business activities shall be carried out independently in accordance with the business license). Licensed projects: power generation, transmission, and supply business; construction project design; various kinds of engineering construction activities (after projects subject to approval according to law are approved by relevant departments, the operations shall be carried out; the specific business projects shall be subject to the approval results).

2、Relationship with the Company: The Company holds 100% of the equity of Dongnan Carbon Neutral, which is a wholly owned subsidiary of the Company.

3、Financial position:

Unit: RMB 10,000

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4、Whether the party is a dishonest person subject to enforcement: No.

IV. Main contents of the guarantee agreement

Guarantor: Zhejiang Dongnan Netting Co., Ltd.

Creditor: China Development Bank New Policy-Based Financial Instrument Co., Ltd.

Borrower: Zhejiang Dongnan Carbon Neutral Science and Technology Co., Ltd.

Guarantee amount: RMB 50,000,000 (five hundred million yuan only)

Guarantee quota validity period: from March 30, 2026 to March 29, 2034

Guarantee method: joint liability guarantee

Guarantee scope: all loan principal, interest, default interest, compounding interest, compensation, liquidated damages, damages, and doubled interest during the period of delayed performance of effective legal documents that the borrower shall pay under the principal contract; as well as fees for the creditor to realize its claims (including, but not limited to, collection fees, litigation costs, arbitration fees, preservation fees, execution fees, notarization fees, lawyer fees, auction fees, delivery fees, guarantee insurance premiums for preservation, translation fees, announcement fees, appraisal fees, and other fees; except for those that, according to laws and regulations, judgments, rulings, or awards effective in accordance with legal procedures should be borne by the creditor); and any other sums and expenses the borrower shall pay as stipulated in the principal contract.

Guarantee period: three years from the date on which the performance period for the debts under the principal contract expires. The time limit for the borrower to perform its debts under the principal contract shall be based on the provisions of the principal contract.

V. Board of Directors’ Opinions

The Company’s provision of guarantees for financing Dongnan Carbon Neutral is to meet its daily production and operating capital needs. Dongnan Carbon Neutral, the guaranteed party, is a subsidiary within the scope of the Company’s consolidated financial statements. It has strong repayment ability. The financial risk of the guarantee is within the Company’s controllable scope. The subject qualification of the guaranteed party, its credit standing, and the approval procedures for external guarantees comply with relevant provisions such as the “Rules Governing the Listing of Stocks on the Shenzhen Stock Exchange” and the “Guidelines for Self-Regulatory Supervision of Listed Companies No. 1—Standardized Operation of Main Board Listed Companies” of the Shenzhen Stock Exchange. This will not have adverse impact on the Company’s development. There is no circumstance that is inconsistent with relevant provisions of the China Securities Regulatory Commission and the “Articles of Association.”

VI. Cumulative number of external guarantees and number of guarantees with overdue situations

As of the date of disclosure of this announcement, the cumulative amount of the effective external guarantee quotas approved by the board of directors is RMB 728,500,000, and the actual outstanding balance of guarantees is RMB 110,307.73 million, accounting for 16.97% of the Company’s audited net assets at the end of 2024. All of these guarantees are for the Company’s wholly owned subsidiaries or controlling subsidiaries. The Company and its controlling subsidiaries have not provided guarantees to entities outside the scope of consolidated financial statements, and there is no cumulative amount of guarantees with overdue situations, no guarantee amounts involved in lawsuits, and no loss amounts that should be borne due to being found to have lost a lawsuit as a result of the guarantees.

Zhejiang Dongnan Netting Co., Ltd.

Board of Directors

March 30, 2026

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