Sinovac Receives Full Payment for Heping Wang's Obligations

2007-07-30

Sinovac Receives Full Payment for Heping Wang's Obligations
Friday July 27, 8:00 am ET

BEIJING, July 27 /Xinhua-PRNewswire/ -- Sinovac Biotech Ltd. (Amex: SVA - News), a China-based vaccine company, announced today that it has received full payment of Heping Wang's outstanding obligations to Sinovac. In connection with the repayment, Sinovac has agreed to the release from escrow 1.5 million Sinovac shares pledged by Mr. Wang as collateral for his obligations.

As previously disclosed in Sinovac's annual report on Form 20-F, Heping Wang, a former director, owed Sinovac outstanding obligations in the amount of approximately RMB7.7 million. This amount related to Mr. Wang's agreement to assume and indemnify certain loan obligations of Tangshan Yian Biological Engineering Co., Ltd. in connection with Sinovac's acquisition from Mr. Wang in January 2004 of the 100% equity interest in Tangshan Yian. Because the above arrangement could potentially violate the provisions of the Sarbanes- Oxley Act against the extension or maintenance of credit to directors, Sinovac demanded full repayment by Heping Wang in June 2006. After much effort at collection, Sinovac finally received full repayment.

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, Japanese encephalitis and SARS. 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.

For more information, please contact:

Helen G. Yang

Sinovac Biotech Ltd.

Tel: +86-10-82890088 x871

Fax: +86-10-62966910

Email: info@sinovac.com

Investors/Media:

Stephanie Carrington/Janine McCargo

The Ruth Group

Tel: +1-646-536-7017 /7033

Email: scarrington@theruthgroup.com

jmccargo@theruthgroup.com

About SINOVAC

Sinovac Biotech Ltd. (SINOVAC) is a China-based global biopharmaceutical company, with a mission of "supply vaccines to eliminate human diseases", the company specializes in the research, development, manufacturing and commercialization of vaccines and related biological products that protect against human infectious diseases.

The company's diversified portfolio includes vaccines for influenza, viral hepatitis, varicella, Hand-Foot-Mouth disease (HFMD), poliomyelitis, pneumococcal disease, etc., of which 3 vaccines have been prequalified by WHO, including inactivated hepatitis A vaccine Healive®, Sabin-strain inactivated polio vaccine (sIPV), and varicella vaccine.

SINOVAC has a leading edge in developing vaccines to combat infectious disease outbreaks and was among the first to initiate R&D during major public health emergencies, including SARS, H5N1, H1N1, and COVID-19. The company developed the world's first inactivated SARS vaccine (Phase I completed), China's first H5N1 influenza vaccine (Panflu®), the world's first H1N1 influenza vaccine (Panflu.1®), and CoronaVac®, the most widely used inactivated COVID-19 vaccine globally.

Beyond its marketed portfolio, the company is advancing a robust pipeline that includes combination vaccines,recombinant protein vaccines and next-generation platforms such as mRNA technologies and antibodies.

With a long-standing commitment to innovation and global health, SINOVAC is expanding its global footprint by strengthening partnerships with research institutions, international organizations, and local partners. Through broader market presence, technological cooperation, and localized production, the company aims to accelerate vaccine development and supply, enhance regional access to high-quality products, and better address unmet medical needs while improving preparedness for future pandemics.

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