Sinovac Announces $9.75 Million Private Placement

2008-01-24

Beijing – January 23, 2008 – Sinovac Biotech Ltd. (Amex: SVA), a leading provider of vaccines in China, today announced that it entered into a securities purchase agreement in connection with a private placement to an institutional accredited investor and, subject to standard closing conditions, will receive approximately $9.75 million in gross proceeds from the sale of 2,500,000 shares of its common stock at a purchase price of $3.90 per share, the last closing price prior to signing of SVA common stock on the American Stock Exchange.

The securities sold in the private placement have not been registered under the Securities Act of 1933, as amended, or state securities laws and may not be offered or sold in the United States absent registration with the Securities and Exchange Commission or an applicable exemption from the registration requirements.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction.

About Sinovac

Sinovac Biotech Ltd. is a China-based biopharmaceutical company that focuses on the research, development, manufacture and commercialization of vaccines that protect against human infectious diseases. Sinovac's vaccines include Healive™ (hepatitis A), Bilive™ (combined hepatitis A and B) and Anflu™ (influenza). Sinovac is currently developing human vaccines against the H5N1 strain of pandemic influenza, and Japanese encephalitis. Additional information about Sinovac is available on its website, http://www.sinovac.com. To be added to our distribution list, please email: info@sinovac.com.

Safe Harbor Statement

This announcement contains forward-looking statements. These statements are made under the "safe harbor" provisions of the U.S. Private Securities Litigation Reform Act of 1995. These forward-looking statements can be identified by words or phrases such as "will," "expects," "anticipates," "future," "intends," "plans," "believes," "estimates" and similar statements. Among other things, the business outlook and quotations from management in this press release contain forward-looking statements. Statements that are not historical facts, including statements about Sinovac's beliefs and expectations, are forward-looking statements. Forward-looking statements involve inherent risks and uncertainties. A number of important factors could cause actual results to differ materially from those contained in any forward-looking statement. Sinovac does not undertake any obligation to update any forward-looking statement, except as required under applicable law.

Contact Information:

Helen G. Yang

Sinovac Biotech Ltd.

Phone: +86-10-82890088 Ext. 871

Fax: +86-10-62966910

Email: info@sinovac.com

Investors/Media:

Stephanie Carrington/Janine McCargo

The Ruth Group

(646) 536-7017/7033

scarrington@theruthgroup.com

jmccargo@theruthgroup.com

About SINOVAC

Sinovac Biotech Ltd. (SINOVAC) is a global biopharmaceutical company headquartered in China. Guided by its mission to “Supply Vaccines to Eliminate Human Diseases,” the company is dedicated to the research, development, manufacturing and supply of vaccines and related biological products, providing vaccine products and related solutions for disease prevention and control worldwide.

SINOVAC has a diversified vaccine portfolio across multiple disease areas, including influenza, viral hepatitis, varicella, hand, foot and mouth disease (HFMD), poliomyelitis, rabies, tetanus, and pneumococcal disease. Three of SINOVAC’s vaccines have been prequalified by the World Health Organization: the inactivated hepatitis A vaccine Healive®, the Sabin-strain inactivated poliomyelitis vaccine (sIPV), and the live attenuated varicella vaccine.

SINOVAC has extensive experience in vaccine research, development and commercialization for emerging infectious diseases and public health emergencies. The company initiated vaccine R&D in response to major public health threats, including SARS, H5N1, H1N1, and COVID-19, and developed the world’s first inactivated SARS vaccine (with Phase I clinical trials completed), China’s first inactivated pandemic influenza vaccine against H5N1 (Panflu®), the world’s first H1N1 influenza vaccine (Panflu.1®), and CoronaVac®, the world’s most widely used inactivated COVID-19 vaccine.Beyond its marketed portfolio, SINOVAC continues to advance its R&D pipeline, spanning combination vaccines, recombinant protein vaccines, mRNA technologies, antibody-based products, and other next-generation technologies and product platforms, while expanding its capabilities in disease prevention and biopharmaceuticals.

With a long-standing commitment to innovation and global health, SINOVAC continues to deepen collaboration with research institutions, international organizations, and local partners while expanding its global presence. Through technological collaboration, localized production, and industrial partnerships, the company aims to improve access to high-quality vaccines across regions, better address local disease prevention and healthcare needs, and strengthen preparedness for future public health challenges.

For more information, please see the Company's website at www.sinovac.com.