AmerisourceBergen was formed in 2001 following the merger of AmeriSource Health Corporation and Bergen Brunswig Corporation. AmeriSource and Bergen were both successful pharmaceutical distributors that served similar markets but covered somewhat different geographies. Bringing the two together gave the company a strong national presence that was geared especially towards serving independent community pharmacies, regional retail chain pharmacies, hospitals, physician offices, clinics and other alternate care facilities.

Today, AmerisourceBergen has 26 pharmaceutical distribution centers in the US, nine distribution centers in Canada, four specialty distribution centers in the US, and over 1 million square feet of packaging production capacity in the US and the UK. With the addition of World Courier, the largest specialty courier company in the world, over 150 company-owned offices around the globe were added to the company.