Sinovac Biotech Ltd. is a biopharmaceutical company based in Beijing, China, specializing in the research, development, manufacture, and commercialization of vaccines for human infectious diseases. Its product portfolio includes vaccines for hepatitis A and B, seasonal influenza, H5N1 and H1N1 pandemic influenza, mumps, and enterovirus 71, among others. Key marketed products include Healive, a hepatitis A vaccine, Bilive, a combined hepatitis A and B vaccine, and Panflu.1, which was the first H1N1 vaccine approved globally. Sinovac also plays a significant role in government stockpiling programs for vaccines in China. The company is actively developing new vaccines, including those for pneumococcal disease and rubella, with various clinical trials underway. Sinovac collaborates with notable institutions such as GlaxoSmithKline and Tianjin CanSino Biotechnology to enhance its vaccine development efforts. Established in 1999, Sinovac primarily sells its products in China while also exporting selected vaccines to countries like Mongolia, Nepal, and the Philippines.