Express Scripts Holding knows that its customers like their medicine delivered quickly. The company administers the prescription drug benefits of millions of health plan members in the US and Canada. Members have access to a network of about 64,000 retail pharmacies, as well as the company's own mail-order pharmacies. On behalf of its insurer clients, Express Scripts processes claims for about 1.4 billion prescriptions per year, designs drug benefit plans, and offers such services as specialty drug delivery, disease management programs, and consumer drug data analysis. The firm merged with rival PBM Medco Health Solutions in 2012, creating the largest pharmacy benefits management (PBM) company in North America.