Announcement on Convening the 2026 Semi-annual Performance Briefing

Shanghai Stock Exchange

2026/08/11

Securities code: 688319 Securities abbreviation: Olin Biotechnology Announcement number: 2026-036

Chengdu Oulin Biotechnology Co., Ltd.

Announcement on the convening of the semi-annual performance briefing

2026

The company's board of directors and all directors guarantee that the contents of this announcement do not contain any false records, misleading statements or major omissions, and assume legal responsibility for the authenticity, accuracy and completeness of its contents.

Important content reminder:

 Meeting time: August 18, 2026 (Tuesday) 15:00-16:00

 Meeting location: Shanghai Stock Exchange Roadshow Center (Website: https://roadshow.sseinfo.com/)

Meeting method: Shanghai Securities Roadshow Center online interaction

 Investors can log in to the homepage of the Shanghai Securities Roadshow Center website before 16:00 on August 11, 2026 (Tuesday) to August 17 (Monday) and click on the "Question Pre-Solicitation" column or ask questions through the company's email address [email protected]. The company will answer questions of common concern to investors at the briefing.

Chengdu Oulin Biotechnology Co., Ltd. (hereinafter referred to as the "Company") will release the company's 2026 semi-annual report on August 18, 2026. In order to facilitate investors to have a more comprehensive and in-depth understanding of the company's operating results and financial status in the first half of 2026, the company plans to hold a 2026 semi-annual performance briefing on August 18, 2026 (Tuesday) 15:00-16:00 to communicate on issues of concern to investors.

1. Type of briefing session

This investor briefing will be held in an interactive online format. The company will interact and communicate with investors on the specific operating results and financial indicators for the first half of 2026, and answer questions of common concern to investors to the extent permitted by information disclosure.

2. Time and place of the briefing meeting

(1) Meeting time: August 18, 2026 (Tuesday) 15:00-16:00

(2) Meeting location: SSE Roadshow Center (Website: https://roadshow.sseinfo.com/)

(3) Meeting method: Shanghai Securities Roadshow Center online interaction

3. Participants

Chairman and General Manager: Mr. Fan Shaowen, Deputy General Manager and Chief Financial Officer: Mr. Tan Yong, Deputy General Manager and Secretary of the Board of Directors: Mr. Wu Wei, Independent Director: Mr. Chen Zhengxu.

(If there are special circumstances, participants may make adjustments.)

4. How to participate as an investor

(1) Investors can log in to the SSE Roadshow Center (https://roadshow.sseinfo.com/) through the Internet at 15:00-16:00 on August 18, 2026 (Tuesday) to participate in this performance briefing online. The company will answer investors' questions in a timely manner.

(2) Investors can log in to the home page of the SSE Roadshow Center website from August 11, 2026 (Tuesday) to August 17 (Monday) before 16:00, click on the "Question Pre-Solicitation" column (https://roadshow.sseinfo.com/questionCollection.do), and select this event according to the event time or through the company email [email protected] Ask the company questions, and the company will answer questions of common concern to investors at the briefing.

5. Contact person and consultation method

Contact person: Securities Affairs Department

Tel: 028-69361198

Email: [email protected]

6. Other matters

After this investor briefing is held, investors can check the status and main content of this investor briefing through the SSE Roadshow Center (https://roadshow.sseinfo.com/).

Announcement is hereby made.

Board of Directors of Chengdu Oulin Biotechnology Co., Ltd.

August 11, 2026