Stock code: 688065 Stock abbreviation: Cathay Biotech Announcement No.: 2025-014

Shanghai Cathay Biotechnology Co., Ltd

Announcement on the progress of the repurchase of the company's shares by means of centralized bidding transactions

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

Important Content Notes:

As of March 31, 2025, Cathay Biotech Co., Ltd. (hereinafter referred to as "Cathay Biotechnology Co., Ltd.")

The company repurchased 220,946 shares of the company through centralized bidding through the trading system of the Shanghai Stock Exchange, accounting for 0.0306% of the company's total share capital of 721,289,794 shares. The highest price of the repurchase transaction was RMB45.95 per share and the lowest price was RMB44.08 per share, and the total amount of funds paid was RMB9,995,695.95 (excluding stamp duty, transaction commissions and other transaction costs).

1. Basic information on the repurchase of shares

On October 21, 2024, the company held the 24th meeting of the second session of the board of directors, which was deliberated and approved

The "Plan on Repurchasing the Company's Shares by Centralized Bidding Transaction" agrees that the company will use its own funds or self-raised funds to repurchase the company's shares by centralized bidding transaction, with the total amount of repurchase funds not less than RMB 10 million (inclusive) and not more than RMB 20 million (inclusive), and the repurchase price shall not exceed 67 yuan per share (inclusive), and the repurchase period shall be within 12 months from the date of approval of the repurchase plan by the board of directors. The details are detailed

See the company's disclosure on the website of the Shanghai Stock Exchange (www.sse.com.cn) on October 22, 2024

Announcement on the Plan to Repurchase the Company's Shares by Centralized Auction Transaction (Announcement No.: 2024-056).

2. Progress of share repurchases

In accordance with the "Rules for Share Repurchase of Listed Companies", "Shanghai Stock Exchange Self-Regulatory Guidelines for Listed Companies No. 7 - Repurchase of Shares" and other relevant regulations, the company's repurchase of shares is hereby announced as follows:

On March 31, 2025, the company traded through the Shanghai Stock Exchange trading system in a centralized bidding manner

220,946 shares of the company were repurchased, accounting for 0.0306% of the company's total share capital of 721,289,794 shares. Repurchase

The highest price of the transaction was RMB45.95 per share and the lowest price was RMB44.08 per share, and the total amount of funds paid was RMB9,995,695.95 (excluding stamp duty, transaction commissions and other transaction fees).

3. Other matters

The company will strictly follow the "Rules for Share Repurchase of Listed Companies", "Shanghai Stock Exchange Self-Regulatory Guidelines for Listed Companies No. 7 - Repurchase of Shares" and other relevant regulations and the company's share repurchase plan, make repurchase decisions and implement them according to market conditions during the repurchase period, and timely fulfill information disclosure obligations according to the progress of the repurchase of shares, please pay attention to investment risks.

The announcement is hereby made.

Shanghai Cathay Biotechnology Co., Ltd

Board of Directors

April 3, 2025