Express Scripts is one of the largest pharmacy benefit managers in the United States. The company provides pharmacy benefit for millions of people through employers, managed-care plans, unions and governmental entities. Express Scripts has administrative offices in several states, such as Minnesota, Pennsylvania, Arizona, New Jersey and Florida, as well as Canadian operations in Quebec and Ontario. The company employs more than 13,000 people that process approximately 400 million retail prescriptions and 50 million mail prescriptions each year. Express Scripts works with plan sponsors to make the prescription drug benefit more affordable through plan design, patient-care management and special programs. The company went public in 1992 and maintains its headquarters in St. Louis.