Stock code: 688563 Stock abbreviation: Aviation Materials Co., Ltd. Announcement No.: 2025-010

Beijing Institute of Aeronautical Materials Co., Ltd

About participating in the listed company of Aero Engine Corporation of China

Announcement of the 2024 Collective Results Briefing

The board of directors and all directors 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.

Important Content Notes:

Meeting time: April 25, 2025 (Friday) 15:00-17:00 pm

Venue: The address of the online conference is the Shanghai Stock Exchange Roadshow Center of the Shanghai Stock Exchange (website:

https://roadshow.sseinfo.com/）； The on-site meeting venue is Chengdu Bay Hotel, Sichuan Province (4

Grand Shopping Plaza, No. 255, South Section of Tianfu Avenue, High-tech Zone, Chengdu, Sichuan Province)

Meeting method: This performance briefing will be held in a combination of text network interaction and on-site Investors can log in to the SSE Roadshow from April 17, 2025 (Thursday) to April 24, 2025 (Thursday) before 16:00

Click on the "Pre-solicitation of Questions" column on the homepage of the center's website or through the company's mailbox info@baimtec.com

Questions. The company will answer the questions of general concern to investors at the briefing.

Beijing Institute of Aeronautical Materials Co., Ltd. (hereinafter referred to as the "Company") has been issued on March 31, 2025

The 2024 Annual Report is disclosed on the website of the Shanghai Stock Exchange (www.sse.com.cn). In order to facilitate investors to have a more comprehensive and in-depth understanding of the company's operating performance and development prospects, the company plans to participate in the 2024 annual collective performance briefing of listed companies affiliated to China Aero Engine Group Co., Ltd. on the afternoon of April 25, 2025 (Friday), and interact with investors through a combination of online text interaction and on-site interaction.

1. Type of briefing

The company will interact and communicate with investors on the specific situation of operating results and financial indicators in 2024, and answer questions of general concern to investors within the scope of information disclosure.

2. The time and place of the briefing

(1) Meeting time: April 25, 2025 (Friday) 15:00-17:00 p.m

(2) Meeting method: The performance briefing will be held in a combination of text network interaction and on-site, 15:00-16:00 on-site communication, 16:00-17:00 network text interaction

(3) Venue: The address of the online conference is the Shanghai Stock Exchange Roadshow Center of the Shanghai Stock Exchange (website: https://roadshow.sseinfo.com/); Chengdu Bay Hotel, Sichuan Province (Grand Shopping Plaza, No. 255, Tianfu Avenue South Section, High-tech Zone, Chengdu, Sichuan Province)

3. Participants

Chairman of the board of directors or general manager, independent directors, secretary of the board of directors (chief financial officer) and personnel of relevant departments.

(In case of special circumstances, participants may be adjusted)

Fourth, the solicitation of questions

Investors can register for SSE from 17 April 2025 (Thursday) to 24 April 2025 (Thursday) before 16:00

On the home page of the performance center, click on the "Ask a Pre-Solicitation" column (

https://roadshow.sseinfo.com/questionCollection.do) or through the company mailbox

info@baimtec.com ask questions to the company, and the company will answer the questions that investors are generally concerned about at the briefing.

5. Contact person and consultation method

Contact: Securities Department

Phone: 010-62457705

E-mail: info@baimtec.com

6. Other matters

After the Investor Briefing Meeting, investors will be able to apply the Investor Statement Centre (

http://roadshow.sseinfo.com/) Check the convening and main content of this investor briefing.

The announcement is hereby made.

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

April 15, 2025