Stock code: 688563 Stock abbreviation: Aviation Materials Co., Ltd. Announcement No.: 2024-047

Beijing Institute of Aeronautical Materials Co., Ltd

Announcement of the resolution of the first meeting of the second board of supervisors

The Board of Supervisors and all the Supervisors of the Company guarantee that there is no false record, misleading statement or material omission in the content of this announcement, and assume legal responsibility for the authenticity, accuracy and completeness of its content.

1. The convening of the meeting of the board of supervisors

The first meeting of the second board of supervisors of Beijing Institute of Aeronautical Materials Co., Ltd. (hereinafter referred to as the "company") was held on-site on the afternoon of December 27, 2024, and the meeting notice was sent to all supervisors after the second extraordinary general meeting of shareholders in 2024 held by the company on the same day. 5 supervisors should attend the meeting, and 5 actually attended. The meeting was presided over by Wu Wensheng, a supervisor elected by more than half of the supervisors, and the secretary of the board of directors of the company attended the meeting. The convening and convening procedures of the meeting are in accordance with the relevant provisions of the Company Law of the People's Republic of China and other laws and regulations and the Articles of Association of Beijing Institute of Aeronautical Materials Co., Ltd., which are legal and valid.

2. Deliberations of the Board of Supervisors

(1) Reviewed and approved the "Proposal on Exempting Beijing Institute of Aeronautical Materials Co., Ltd. from Notifying the Convening of the Board of Supervisors Meeting 5 Days in Advance"

The result of the vote: 5 votes in favor, 0 votes against and 0 abstentions.

(2) Reviewed and approved the "Proposal on Electing the Chairman of the Second Board of Supervisors of the Company"

The result of the vote: 5 votes in favor, 0 votes against and 0 abstentions.

For details, please refer to the company's disclosure on the website of the Shanghai Stock Exchange (www.sse.com.cn) on the same day

Announcement on the Completion of the General Election of the Board of Directors and the Board of Supervisors and the Appointment of Senior Managers (Announcement No.: 2024-048).

3. Documents for reference

(1) Resolution of the First Meeting of the Second Board of Supervisors of Beijing Institute of Aeronautical Materials Co., Ltd

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The announcement is hereby made.

Board of Supervisors of Beijing Institute of Aeronautical Materials Co., Ltd

December 30, 2024