BEONE MEDICINES - Announcement from BeiGene Co., Ltd. on holding a semi-annual performance briefing 2026

BeOne Medicines Ltd.

BeiGene Co., Ltd.

(Company incorporated under Swiss law)

(Stock code: 06160)

Overseas regulatory announcement

This announcement is made by BeOne Medicines Ltd. (the "Company") in accordance with Rule 13.10B of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited.

Hereby is set forth the "Announcement of BeiGene Co., Ltd. on Convening the 2026 Semi-annual Results Briefing" published by the Company on the website of the Shanghai Stock Exchange for reference only.

By order of the board of directors

BeiGene Co., Ltd.

Chairman

Mr. Olejian

Hong Kong, August 20, 2026

As of the date of this announcement, the Company's Board of Directors includes Mr. O'Leary, Chairman and Executive Director, Dr. Felix J. Baker and Dr. Wang Xiaodong, Non-executive Directors, and Dr. Olivier Brandicourt, Dr. Margaret Han Dugan, Mr. Anthony C. Hooper, Ms. Elizabeth F. Mooney, Dr. Alessandro Riva, Dr. Charles L. Sawyers and Ms. Shalini Sharp, independent non-executive directors.

A-share code: 688235 A-share abbreviation: BeiGene Announcement number: 2026-025 Hong Kong stock code: 06160 Hong Kong stock abbreviation: BeiGene

US stock code: ONC

BeiGene Co., Ltd.

Announcement on the convening of the semi-annual performance briefing meeting

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 in accordance with the law.

Important content reminder:

1. Meeting time: August 28, 2026 (Friday) 09:00-10:00

2. The meeting will be held at: Shanghai Stock Exchange Roadshow Center (Website: https://roadshow.sseinfo.com/)

3. Meeting method: Shanghai Securities Roadshow Center online interaction

4. Investors can log in to the homepage of the Shanghai Securities Roadshow Center website before 16:00 on August 21, 2026 (Friday) to August 27 (Thursday) 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.

BeiGene Co., Ltd. (hereinafter referred to as the "Company") will release the company's 2026 semi-annual report on August 27, 2026. In order to facilitate investors to have a more comprehensive and in-depth understanding of the company's 2026 semi-annual operating results and financial status, the company plans to hold a 2026 semi-annual performance briefing on August 28, 2026 (Friday) 09:00-10:00 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 28, 2026 (Friday) 09:00-10:00

2. The meeting will be held at: Shanghai Stock Exchange Roadshow Center (Website: https://roadshow.sseinfo.com/)

3. Meeting method: Shanghai Securities Roadshow Center online interaction

4. Participants

Participants in this briefing include:

President and Chief Operating Officer: Dr. Wu Xiaobin;

President, Global R&D Head: Dr. Wang Lai;

Chief Financial Officer: Mr. Aaron Rosenberg;

Head of Investor Relations and Domestic Representative for Information Disclosure in Asia Pacific: Ms. Zhou Mi

The company will also invite an independent non-executive director to attend the briefing.

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

4. How investors participate

5. Investors can log in to the SSE Roadshow Center (https://roadshow.sseinfo.com/) via the Internet from 09:00-10:00 on August 28, 2026 (Friday) to participate in this performance briefing online. The company will answer investors’ questions in a timely manner.

6. Investors can log in to the homepage of the SSE Roadshow Center website before 16:00 on August 21, 2026 (Friday) to August 27 (Thursday), click on the "Pre-Solicitation for Questions" column (https://roadshow.sseinfo.com/preCallQa), and select this event according to the event time or ask questions to the company through the company's email address [email protected]. The company will present the question at the briefing session

to answer questions that investors are generally concerned about.

5. Contact persons and consultation methods

Contact: Investor Relations Department

Phone: 400 862 3235

Email: [email protected]

6. Other matters

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

Announcement is hereby made.

BeiGene Co., Ltd. Board of Directors

August 21, 2026