Clarification Statement

2021-01-31

Sinovac Biotech Ltd. (“Sinovac”) today learned of an English-language statement that was purportedly made in the name of Sinovac. This fraudulent statement (“Fraudulent Statement”) was in no way made or authorized by Sinovac, nor does it reflect the views of Sinovac. The Fraudulent Statement was sent to certain media outlets in Brazil on 30 January 2020, disguised as a valid statement from Sinovac. A number of media have reported about the Fraudulent Statement.

With regard to this, we hereby clarify that:

(i) Abernathy MacGregor is the sole media relation consultant engaged by Sinovac or authorized to communicate or issue statements on its behalf. Sinovac has never authorized or engaged any other company or individual to carry out any public relations activities on behalf of Sinovac.

(ii) Sinovac has never made or issued or engaged any individual or organization to make or issue the Fraudulent Statement.

Sinovac believes that the global fight against the COVID-19 pandemic requires unity and a coordinated response. All of the companies and organizations committed to fighting the pandemic are contributing partners, not competitors.

We oppose any malicious degrading for defamation. Sinovac wishes to condemn the fraudulent behaviors involved with the Fraudulent Statement and the sentiments therein, and reserves all rights to take actions to seek remedies and pursue liabilities against those who have made and published the Fraudulent Statement.

Sinovac Biotech Ltd.

Jan 31, 2021

About SINOVAC

Sinovac Biotech Ltd. (SINOVAC) is a China-based biopharmaceutical company that focuses on the research, development, manufacturing, and commercialization of vaccines that protect against human infectious diseases.

SINOVAC's product portfolio includes vaccines against COVID-19, enterovirus 71 (EV71) infected Hand-Foot-Mouth disease (HFMD), hepatitis A and B, seasonal influenza, pneumococcal disease, H5N1 pandemic influenza (avian flu), H1N1 influenza (swine flu), varicella, mumps, and poliomyelitis.

SINOVAC's COVID-19 vaccine, CoronaVac®, has been approved for use in more than 60 countries and regions worldwide. The Healive®, a hepatitis A vaccine manufactured by the Company, passed the assessment under WHO prequalification procedures in 2017. The EV71 vaccine, Inlive®, is an innovative vaccine, that was commercialized in China in 2016. In 2022, SINOVAC's Sabin-strain inactivated polio vaccine (sIPV) was prequalified by WHO.

SINOVAC was the first company that granted approval for its H1N1 influenza vaccine Panflu.1®, which has supplied to the Chinese Government's vaccination campaign and stockpiling program. The Company is also the only supplier of the H5N1 pandemic influenza vaccine, Panflu®, to the Chinese government stockpiling program.

SINOVAC has been continually dedicating itself to new vaccine research and development, with more combination vaccine products in the pipeline, and constantly exploring opportunities in the international market. SINOVAC looks forward to conducting more extensive and in-depth trade and cooperation with more countries, enterprises, and professional institutions.

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

Contacts

Sinovac Biotech Ltd.

Helen Yang

+86-10-8279-9871 or

+86-10-5693-1897

Fax: +86-10-6296-6910

ir@sinovac.com

ICR Inc.

Bill Zima

U.S.: 1-646-308-1707

william.zima@icrinc.com