The Company's audit committee has commenced and is diligently conducting a process to evaluate and select a new independent registered public accounting firm so that the 2024 Annual Report can be filed as soon as practicable. The Company intends to submit the Compliance Plan within the prescribed 60-day period ending July 15, 2025. About SINOVAC Sinovac Biotech Ltd. (SINOVAC) is a China-based biopharmaceutical company that focuses on the R&D, 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, varicella, influenza, poliomyelitis, pneumococcal disease, etc. The COVID-19 vaccine, CoronaVac ®, has been approved for use in more than 60 countries and regions worldwide. The hepatitis A vaccine, Healive ®, passed WHO prequalification requirements in 2017.