Notice of 2024 Annual General Meeting

22 April, 2024

Dear Shareholders,

Greetings!

The 2024 Annual General Meeting (the ‘‘AGM’’) of Genscript Biotech Corporation (the ‘‘Company’’) will be held at 9:30 a.m. on Friday, May 17, 2024, in Nanjing. For details, please refer to the “NOTICE OF ANNUAL GENERAL MEETING” of the Company dated April 22, 2024 on the Company's website or HKEX website.

The Company encourages registered shareholders¹ who intend to vote at the AGM to exercise their voting rights by completing and submitting the " FORM OF PROXY FOR 2024 ANNUAL GENERAL MEETING " and appointing the Chairman of the AGM to vote according to the instructions on the proxy form. The proxy form can be downloaded from the Company's "Investor Relations/Announcements and Circulars" webpage (https://www.genscript.com/announcements-circulars.html) or the HKEXnews website (www.hkexnews.hk). Non-registered shareholders² who intend to vote at the AGM are advised to contact their securities brokers or custodians to assist with submitting their voting instructions (considering the time required for internal processes of securities brokers, custodians, and HKSCC, please contact your securities agent as soon as possible to complete the relevant procedures).

Shareholders or their appointed proxies who wish to attend the AGM in person are invited to scan the QR code below to learn about the registration process and submit their registration information.

The poll results of the meeting will be published on the Company's "Investor Relations/Announcements and Circulars" webpage (https://www.genscript.com/announcements-circulars.html) and the HKEXnews website (www.hkexnews.hk) after the AGM.

For any inquiries regarding the AGM, please send an email to IR@genscript.com.

Thanks for your attention and support.

GenScript Biotech Corporation

¹ Refers to shareholders who hold shares of the Company registered at the Company's share registrar in Hong Kong (Computershare Hong Kong Investor Services Limited)
² Refers to shareholders who hold shares of the Company through securities brokers or custodians, with their shares deposited in HKSCC