WuXi PharmaTech (pronounced WOO-shee) is a research and development (R&D) services company headquartered in Shanghai, with operations in China and the United States. The company uses an open-access technology platform designed to enable efficient development of medicines for customers. WuXi acts as a contract researcher for most of the world's largest pharmaceutical, biotech and medical device companies and many smaller companies. As of April 2013, the company had more than 1,600 customers.