Wanhua Chemical Group Co., Ltd. Yantai Industrial Park PDH Unit Shutdown and Maintenance Announcement

Stock Code: 600309 Stock Abbreviation: Wanhua Chemical Announcement No.: Lin 2026-13

Wanhua Chemical Group Co., Ltd.

Announcement on the Shutdown for Maintenance of the PDH Unit at the Yantai Industrial Park

This company’s board of directors and all directors warrant that the contents of this announcement contain no false records, misleading statements, or material omissions, and assume individual and joint liability for the authenticity, accuracy, and completeness of the contents.

In accordance with the production process characteristics of chemical enterprises, and in order to ensure the safe and effective operation of the production units, according to the annual maintenance plan, the 750,000-ton/year PDH unit of the Yantai Industrial Park will be shut down for maintenance starting March 22, 2026, and the maintenance is expected to last for about 30 days. Meanwhile, in line with the overall balance of the park, the downstream PO/AE integrated units will undergo load adjustments, and the company will make every effort to ensure stable supply to its downstream customers.

This shutdown for maintenance is a routine maintenance carried out in accordance with the annual plan, and will not have a material impact on the company’s production and operations.

Hereby announced.

Wanhua Chemical Group Co., Ltd.

March 19, 2026

Stock Code: 600309 Stock Abbreviation: Wanhua Chemical Announcement No.: Lin 2026-12

Wanhua Chemical Group Co., Ltd.

Issuance Announcement for the Third Round of 2026 Science and Technology Innovation Bonds

Results Announcement

This company’s board of directors and all directors warrant that the contents of this announcement contain no false records, misleading statements, or material omissions, and assume individual and joint liability for the authenticity, accuracy, and completeness of the contents.

Wanhua Chemical Group Co., Ltd. (hereinafter referred to as the “Company”) considered and approved, at the 2025 first meeting of the ninth session of the board of directors held on April 12, 2025, the “Proposal on Applying for Continued Registration upon Expiration of Debt Financing Instruments for Non-Financial Enterprises (DFI),” and, after approval through voting at the 2024 annual general meeting of shareholders held on May 15, 2025, agreed that the Company would apply to the National Association of Financial Market Institutional Investors for continued registration upon expiration of the DFI of non-financial enterprises, and issue products such as super short-term financing bills, short-term financing bills, medium-term notes, perpetual notes, asset-backed notes, green debt financing instruments, and others within China.

On June 24, 2025, the Company received the “Notice of Acceptance of Registration” issued by the National Association of Financial Market Institutional Investors (Zhongshi Xie Zhu [2025] DFI36). The National Association of Financial Market Institutional Investors accepted the registration of the Company’s debt financing instruments. The registration is valid for 2 years from the date of the notice’s signature, and during the valid registration period, products such as super short-term financing bills, short-term financing bills, medium-term notes, perpetual notes, asset-backed notes, green debt financing instruments, and others may be issued in installments.

Based on its own capital planning arrangements and the conditions in the interbank market, in the near term the Company issued the Third Round of 2026 Science and Technology Innovation Bonds in the National Interbank Market, and the raised funds have been received. The issuance results are as follows:

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For relevant documents concerning this bond issuance, please refer to the China Money Network (www.chinamoney.com.cn) and the Shanghai Clearing House website (www.shclearing.com.cn).

Hereby announced.

Wanhua Chemical Group Co., Ltd.

March 19, 2026

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