SVA [SINOVAC BIOTECH] 6-K: SINOVAC BIOTECH LTD. 10,000,000 Common Shares ($ 0.001
[SINOVAC BIOTECH LTD. 10,000,000 Common Shares ($ 0.001 par value per Share) UNDERWRITING AGREEMENT January 27, 2010 UNDERWRITING AGREEMENT January 27, 2010 UBS Securities LLC c/o UBS Securities LLC 299 Park Avenue New York, New York 10171-0026 Piper Jaffray & Co. c/o Piper Jaffray & Co. U.S. Bancorp Center 800 Nicollet Mall Minneapolis, Minnesota 55402 as Managing Underwriters and Representatives] [1 - 32371 SINOVAC BIOTECH LTD. No. 39 Shangdi Xi Road Haidian District Beijing 100085, Peoples Republic of China Form 20-F x Form 40-F o o o Incorporation by Reference 333-163165). 2 SINOVAC BIOTECH LTD.]