Monthly Return of Equity Issuer on Movements in Securities for the month ended 30 April 2021

(1) 2020 REPORT OF THE BOARD OF DIRECTORS (2) 2020 REPORT OF THE BOARD OF SUPERVISORS (3) 2020 ANNUAL REPORT AND ITS ABSTRACT (4) 2020 FINANCIAL ACCOUNTS REPORT (5) 2021 FINANCIAL BUDGET (6) 2020 PROFIT DISTRIBUTION PLAN (7) RE-APPOINTMENT OF AUDITORS (8)

NOTICE OF 2020 ANNUAL GENERAL MEETING

Form of Proxy for use at the 2020 Annual General Meeting to be held on Tuesday, June 8, 2021

NOTIFICATION LETTER AND REQUEST FORM TO NON-REGISTERED HOLDERS

NOTIFICATION LETTER AND CHANGE REQUEST FORM TO REGISTERED SHAREHOLDERS

Monthly Return of Equity Issuer on Movements in Securities for the month ended 31 March 2021

ANNUAL RESULTS ANNOUNCEMENT FOR THE YEAR ENDED DECEMBER 31, 2020 AND CHANGE OF PRINCIPAL PLACE OF BUSINESS IN HONG KONG

Election of Means of Receipt and Language of Corporate Communications

Election of Means of Receipt and Language of Corporate Communications

Reply Form

NOTICE OF BOARD MEETING

Next Day Disclosure Returns

VOLUNTARY ANNOUNCEMENT - COLLABORATION AGREEMENT WITH SUZHOU BIOX

VOLUNTARY ANNOUNCEMENT - ACQUISITION OF LAND USE RIGHT IN SUZHOU, THE PRC

Monthly Return of Equity Issuer on Movements in Securities for the month ended 28 February 2021

PARTIAL EXERCISE OF THE OVER-ALLOTMENT OPTION, STABILIZING ACTIONS AND END OF STABILIZATION PERIOD

VOLUNTARY ANNOUNCEMENT - A MATERIAL PATENT RELATING TO PGT-SR KIT REGISTERED WITH CNIPA

ANNOUNCEMENT OF OFFER PRICE AND ALLOTMENT RESULTS

ARTICLES OF ASSOCIATION

LIST OF DIRECTORS AND THEIR ROLE AND FUNCTION

TERMS OF REFERENCE OF THE AUDIT COMMITTEE OF THE BOARD

TERMS OF REFERENCE OF THE NOMINATION COMMITTEE OF THE BOARD

TERMS OF REFERENCE OF THE REMUNERATION AND APPRAISAL COMMITTEE OF THE BOARD

FORMAL NOTICE – GLOBAL OFFERING