Qingdao Blue Ocean Biological Co., Ltd. Announcement on the Progress of the Investment by Its Wholly-Owned Subsidiary

Securities Code: 603739 Securities Abbreviation: Weilan Biology Announcement Number: 2026-010

Qingdao Weilan Biology Co., Ltd.

Progress Announcement on Investment by Wholly-Owned Subsidiary

The board of directors and all directors of the company guarantee that there are no false records, misleading statements, or significant omissions in the content of this announcement, and bear legal responsibility for the authenticity, accuracy, and completeness of its content.

I. Overview of External Investment

Qingdao Weilan Biology Co., Ltd. (hereinafter referred to as “the Company”) held the twenty-third meeting of the fifth board of directors on February 10, 2026, and convened the first extraordinary general meeting of shareholders in 2026 on March 6, 2026, which approved the proposal on the acquisition of 50% equity of Aidi Alliance Weilan Biotechnology (Shandong) Co., Ltd. by its wholly-owned subsidiary. The Company’s wholly-owned subsidiary, Qingdao Weilan Biology Group Co., Ltd. (hereinafter referred to as “Weilan Biology Group”), signed an Equity Transfer Agreement with Archer Daniels Midland Singapore, Pte. Ltd. (hereinafter referred to as “ADM Singapore”), whereby Weilan Biology Group will purchase 50% equity of Aidi Alliance Weilan Biotechnology (Shandong) Co., Ltd. (hereinafter referred to as “Aidi Alliance Weilan”) held by ADM Singapore for a transaction price of RMB 47 million. For specific details, please refer to the announcement titled “Qingdao Weilan Biology Co., Ltd. on the Acquisition of 50% Equity of Aidi Alliance Weilan Biotechnology (Shandong) Co., Ltd. by Wholly-Owned Subsidiary” disclosed by the Company on the Shanghai Stock Exchange website (www.sse.com.cn) on February 11, 2026 (Announcement Number: 2026-004).

II. Progress of External Investment

Recently, Aidi Alliance Weilan has completed the registration of industrial and commercial changes, and Weilan Biology Group holds 100% equity of Aidi Alliance Weilan. This transaction still needs to meet other relevant conditions (including but not limited to the completion of foreign exchange registration procedures), and the Company will continue to promote related matters.

Aidi Alliance Weilan has obtained the “Business License” issued by the Market Supervision Administration of Gaomi City, and the relevant registration information is as follows:

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This announcement is hereby made.

Board of Directors of Qingdao Weilan Biology Co., Ltd.

March 27, 2026

Securities Code: 603739 Securities Abbreviation: Weilan Biology Announcement Number: 2026-011

Qingdao Weilan Biology Co., Ltd.

Progress Announcement on Providing Guarantees for Wholly-Owned Subsidiary

The board of directors and all directors of the company guarantee that there are no false records, misleading statements, or significant omissions in the content of this announcement, and bear legal responsibility for the authenticity, accuracy, and completeness of its content.

Important Content Reminder:

● Guaranteed Object and Basic Situation

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● Cumulative Guarantee Situation

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I. Overview of Guarantee Situation

(1) Basic Situation of the Guarantee

On March 26, 2026, Qingdao Weilan Biology Co., Ltd. (hereinafter referred to as “the Company”) signed a Guarantee Contract with the Qingdao Olympic Sailing Branch of the Industrial and Commercial Bank of China Limited, providing joint responsibility guarantee for the credit business conducted by its wholly-owned subsidiary, Qingdao Weilan Biology Group Co., Ltd. (hereinafter referred to as “Weilan Biology Group”), with a total guarantee amount of RMB 30 million.

(2) Internal Decision-Making Procedures

The above guarantee matter has been reviewed and approved by the Company’s fifth board of directors at its sixteenth meeting held on April 25, 2025, and was approved by the Company’s annual general meeting of shareholders held on May 16, 2025. For specific details, please refer to the announcements titled “Qingdao Weilan Biology Co., Ltd. on Estimated External Guarantee Amount for 2025” (Announcement Number: 2025-011) and “Qingdao Weilan Biology Co., Ltd. 2024 Annual General Meeting Resolution Announcement” (Announcement Number: 2025-022) disclosed by the Company on the Shanghai Stock Exchange website on April 26, 2025, and May 17, 2025, respectively.

II. Basic Situation of the Guaranteed Party

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III. Main Content of the Guarantee Agreement

1. Creditor: Qingdao Olympic Sailing Branch of Industrial and Commercial Bank of China Limited

2. Debtor: Qingdao Weilan Biology Group Co., Ltd.

3. Guarantor: Qingdao Weilan Biology Co., Ltd.

4. Guarantee Method: Joint responsibility guarantee

5. Guarantee Amount: RMB 30 million

6. Guarantee Period: From the expiration of the loan term or precious metal lease term under the independent contract, three years; if the creditor announces the loan or precious metal lease is due early according to the main contract, then the guarantee period is three years from the date of early maturity of the loan or precious metal lease.

7. Guarantee Scope: Principal of the main debt (including the principal of the precious metal lease and the amount converted into RMB based on the precious metal lease contract), interest, precious metal lease fees and personalized service fees, compound interest, penalty interest, liquidated damages, compensation for damages, precious metal lease weight shortfall fees, exchange rate losses (related losses arising from exchange rate fluctuations), losses related to precious metal price fluctuations, transaction fees arising from the lender exercising corresponding rights according to the main contract, and costs incurred for realizing the creditor’s rights (including but not limited to litigation fees, attorney fees, etc.).

IV. Necessity and Rationality of the Guarantee

Weilan Biology Group is a wholly-owned subsidiary of the Company, and this guarantee matter is to meet the business development and production needs of the subsidiary, which aligns with the overall interests and development strategy of the Company. The guaranteed party is a wholly-owned subsidiary with an asset-liability ratio below 70%, and the Company can effectively control the risks and decisions of its daily operations, with no circumstances that would harm the interests of the Company and its shareholders.

V. Board of Directors’ Opinion

The Company held the sixteenth meeting of the fifth board of directors on April 25, 2025, and approved the proposal on applying for bank credit limits and providing guarantees. For specific details, please refer to the announcement titled “Estimated External Guarantee Amount for 2025” disclosed by the Company on the Shanghai Stock Exchange website (www.sse.com.cn) on April 26, 2025 (Announcement Number: 2025-011).

This guarantee matter is within the scope of the board’s review and does not require another board meeting for deliberation.

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

(1) Cumulative Amount of External Guarantees

As of the date of this announcement, the total amount of external guarantees provided by the Company and its controlling subsidiaries is RMB 1,233.70 million, accounting for 71.00% of the audited net assets attributable to shareholders of the listed company as of December 31, 2024. Among them, the total amount of guarantees provided by the Company for its controlling subsidiaries is RMB 1,233.70 million, accounting for 71.00% of the audited net assets attributable to shareholders of the listed company as of December 31, 2024.

(2) Overdue Guarantees

As of the date of this announcement, the Company has no overdue guarantee matters.

This announcement is hereby made.

Board of Directors of Qingdao Weilan Biology Co., Ltd.

March 27, 2026

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