HENGRUI PHARMA - Overseas Regulatory Announcement - Announcement on the Plan of Repurchase of A shares of the Company through Centralized Price Bidding

Jiangsu Hengrui Pharmaceuticals Co., Ltd.

江蘇恒瑞醫藥股份有限公司

(A joint stock company incorporated in the People's Republic of China with limited liability)

(Stock Code: 1276)

OVERSEAS REGULATORY ANNOUNCEMENT

This announcement is made pursuant to the disclosure requirements under Rule 13.10B of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited.

According to the relevant regulations of the People's Republic of China, Jiangsu Hengrui Pharmaceuticals Co., Ltd. (the "Company") had published an announcement on the website of the Shanghai Stock Exchange (www.sse.com.cn). The following is a translation of the abovementioned announcement solely for reference only. Should there be any discrepancies, the Chinese version will prevail.

By order of the Board

Jiangsu Hengrui Pharmaceuticals Co., Ltd.江蘇恒瑞醫藥股份有限公司

Mr. Sun Piaoyang

Chairman

Shanghai, PRC

August 19, 2026