WuXi Biologics Cayman : NOTIFICATION LETTER AND REQUEST FORM TO NON-REGISTERED HOLDERS

WUXI BIOLOGICS (CAYMAN) INC.

藥明生物技術有限公司*

(Incorporated in the Cayman Islands with limited liability)

(Stock Code: 2269)

Dear Non-Registered Holder(s)1,

May 17, 2021

Notification of Publication of Corporate Communications on the Company's Website

We hereby notify you that the following corporate communications (the "Current Corporate Communications") of WuXi Biologics (Cayman) Inc. (the "Company"), in both English and Chinese versions, are now available on the Company's website at www.wuxibiologics.com and the website of The Stock Exchange of Hong Kong Limited (the "Stock Exchange") at www.hkexnews.hk:

• Circular dated May 17, 2021 and Notice of Annual General Meeting.

You may now access the Current Corporate Communications under "Investors" section of the Company's website or the Stock Exchange's website.

If you wish to receive a printed copy of the Current Corporate Communications, please complete the enclosed Request Form for Non-Registered Holder(s) (with a pre-paid postage mailing label at the bottom of the Request Form for Non-Registered Holder(s)) and return it to the Company c/o the Company's branch share registrar and transfer office in Hong Kong (the "Hong Kong Branch Share Registrar"), Tricor Investor Services Limited by mail at Level 54, Hopewell Centre, 183 Queen's Road East, Hong Kong, or by email to [e-mail]. The printed copy of the Current Corporate Communications will be sent to you free of charge upon receipt of your request.

Please note that by completing and returning the Request Form for Non-Registered Holder(s) to request for the printed copy of the Current Corporate Communications, you will expressly indicate that you prefer to receive all future Corporate Communications2 of the Company in printed form.

Should you have any queries relating to this notification, please call the enquiry hotline of the Hong Kong Branch Share Registrar at (852) 2980 1333 during business hours from 9:00 a.m. to 6:00 p.m., Monday to Friday, excluding Hong Kong public holidays.

Yours faithfully,

For and on behalf of

WuXi Biologics (Cayman) Inc.

Dr. Ge Li

Chairman

Encl.

Notes:

1. Non-RegisteredHolder refers to a person or company whose shares in the Company are held in The Central Clearing and Settlement System (CCASS).
2. Corporate Communication(s) refers to any document(s) issued or to be issued by the Company for information or action of holders of securities of the Company, including but not limited to: (a) directors' reports, annual accounts together with a copy of the independent auditor's reports and, where applicable, summary financial reports; (b) interim reports and, where applicable, summary interim reports;
   (c) notices of meetings; (d) listing documents; (e) circulars; and (f) proxy forms.

*  For identification purpose only

Request Form for Non-Registered Holder(s)

To: WuXi Biologics (Cayman) Inc. (the "Company") (Stock Code: 2269)

c/o Tricor Investor Services Limited Level 54, Hopewell Centre

183 Queen's Road East Hong Kong

I/We would like to receive the Current Corporate Communications and all future Corporate Communications^ of the Company in the manner as indicated below:

(Please mark "✓" in ONLY ONE of the following boxes.)
to receive the printed English version ONLY; or
to receive the printed Chinese version ONLY; or
to receive both the printed English and Chinese versions.
Name of Non-Registered Holder(s):		Contact telephone number:
Address:
Signature:			Date:

Notes:

1. Please complete all the items. If no box, or more than one box, is marked "✓", or any signature or other information is incorrectly completed, the Company reserves its right to treat this Request Form for Non-Registered Holder(s) as void.
2. Non-RegisteredHolder refers to a person or company whose shares in the Company are held in The Central Clearing and Settlement System (CCASS).
3. By completing and returning this Request Form for Non-Registered Holder(s) to request for the printed copy of the Corporate Communications, you have expressly indicated that you prefer to receive all future Corporate Communications of the Company in printed form.
4. For the avoidance of doubt, we do not accept any other special instructions written on this Request Form for Non-Registered Holder(s).
5. Should you have any queries in relation to this Request Form for Non-Registered Holder(s), please call the enquiry hotline of the Hong Kong Branch Share Registrar at (852) 2980 1333 during business hours from 9:00 a.m. to 6:00 p.m., Monday to Friday, excluding Hong Kong public holidays.

• Corporate Communications include but not limited to: (a) directors' reports, annual accounts together with a copy of the independent auditor's reports and, where applicable, summary financial reports; (b) interim reports and, where applicable, summary interim reports; (c) notices of meetings; (d) listing documents; (e) circulars; and (f) proxy forms.

PERSONAL INFORMATION COLLECTION STATEMENT

1. "Personal Data" in this statement has the same meaning as "personal data" in the Personal Data (Privacy) Ordinance, Chapter 486 of the Laws of Hong Kong (the "PDPO").
2. Your supply of Personal Data to the Company is on a voluntary basis. If you fail to provide sufficient information, the Company may not be able to process your appointment of proxy and other instructions.
3. Your Personal Data may be disclosed or transferred by the Company to its subsidiaries, its share registrar and branch share registrar in Hong Kong, and/or other companies or bodies for any of the stated purposes, and retained for such period as may be necessary for our verification and record purposes.
4. You have the right to request access to and/or correction of your Personal Data in accordance with the provisions of the PDPO. Any such request for access to and/or correction of your Personal Data should be in writing to the Personal Data Privacy Officer of Tricor Investor Services Limited (the address stated in note 5 above).

(Please cut along the dotted line 請沿虛線剪下)

Please cut the mailing label and stick this on an envelope to

return the Request Form to us.

No postage stamp is required for local mailing in Hong Kong.

當 閣下寄回此表格時，請將此郵寄標籤剪貼於信封上。

如在本港投寄， 閣下無需支付郵費或貼上郵票。

Mailing Label 郵寄標籤

Tricor Investor Services Limited

卓佳證券登記有限公司

Freepost No. 簡便回郵號碼：37

Hong Kong 香港