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 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 (Paneflu®), 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.