SVA [SINOVAC BIOTECH] 20-F: CONTENTS
[CONTENTS] [SPECIMEN * NOT VALID UNLESS COUNTERSIGNED BY TRANSFER AGENT * INCORPORATED UNDER THE LAWS OF THE GOVERNMENT OF ANTIGUA Number Sinovac Shares BIOTECH LTD. This Certifies that Is the Owner of Fully paid and non-assessable shares of Common Stock of Sinovac Biotech Ltd. transferable on the bo]