Sinovac Update on the Exchange of Rights for Common and Series B Preferred Shares

Sinovac Biotech Ltd. (NASDAQ:SVA) (“Sinovac” or the “Company”), a leading provider of biopharmaceutical products in China, today provided an update for shareholders with regards to the exchange (the “Exchange”) of preferred share purchase rights (the “Rights”) for the Company’s Common Shares and Series B Convertible Preferred Shares (the “Exchange Shares”), originally announced on February 22, 2019, by press release.

On April 4, 2019, the Eastern Caribbean Supreme Court, Court of Appeal issued an order that restrains the Company from taking further action under its Rights Agreement, including the distribution of the previously issued Exchange Shares to the holders of valid Rights, until the conclusion of 1Globe Capital, LLC’s appeal of the December 19, 2018 Judgment of the High Court of Justice of Antigua and Barbuda. In the Judgment, the High Court determined that the current directors of the Company were validly elected at the Annual General Meeting held in February 2018 and remain the directors of the Company, and that the Company’s Rights Agreement is valid under Antigua law.

As previously announced by press release, on March 6, 2019, the Delaware Chancery Court entered a Status Quo order providing that Sinovac not distribute any of the Exchange Shares to holders of valid Rights until the final disposition of the Delaware litigation or further order. On April 8, 2019, the Delaware Chancery Court stayed the Delaware litigation pending the outcome of 1Globe’s appeal of the Antigua Judgment.

As a result, the Exchange Shares are expected to remain in the Shareholder 2019 Rights Exchange Trust in the name of Wilmington Trust, National Association, until, at least, the conclusion of the Antigua appeal and final disposition of the Delaware litigation or further order of the Delaware Chancery Court. The Exchange Shares remain issued and outstanding and holders of valid Rights may continue to submit certifications to verify that they are eligible for the Exchange.

The Company will work with the Nasdaq Stock Market LLC to resume trading of the Company’s Common Shares as expeditiously as possible, but is currently unable to estimate when trading will resume.

About Sinovac

Sinovac Biotech Ltd. 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 enterovirus71, or EV71, hepatitis A and B, seasonal influenza, H5N1 pandemic influenza (avian flu), H1N1 influenza (swine flu), and mumps. Healive, the hepatitis A vaccine manufactured by the Company has passed the assessment under WHO Prequalification procedures in 2017. The EV71 vaccine, an innovative vaccine developed by Sinovac against hand foot and mouth disease caused by EV71, was commercialized in China in 2016. In 2009, Sinovac was the first company worldwide to receive approval for its H1N1 influenza vaccine, which it 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 to the government stockpiling program. The Company is developing a number of new products including a Sabin-strain inactivated polio vaccine, pneumococcal polysaccharides vaccine, pneumococcal conjugate vaccine and varicella vaccine. Sinovac primarily sells its vaccines in China, while also exploring growth opportunities in international markets. The Company has exported select vaccines to over 10 countries in Asia and South America. For more information please see the Company’s website at www.sinovacbio.com.