Cencora, Inc., formerly known as AmerisourceBergen, is an American drug wholesale company and a contract research organization that was formed by the merger of Bergen Brunswig and AmeriSource in 2001.

In March 2016, pharmacy Walgreens Boots Alliance Inc. announced it would exercise an option to purchase 22.7 million shares of AmerisourceBergen stock and thereby control 15% of the company.

[8][9] The company changed its name to Cencora as of August 30, 2023 and began trading on the New York Stock Exchange under the new ticker symbol "COR".

AmerisourceBergen handles about 20% of all of the pharmaceuticals sold and distributed throughout the United States and ranked 10th on the Fortune 500 list for 2020 with over $179 billion in annual revenue.

In June 2020, the U.S. Department of Health and Human Services (HHS) announced an unusual agreement for the distribution of remdesivir, the first coronavirus drug.

HHS agreed to manufacturer Gilead's wholesale acquisition price, while HHS would continue to work together with state governments and AmerisourceBergen to allocate shipments of remdesivir vials to American hospitals through the end of September 2020, and in exchange, during that time-frame American patients would be allocated over 90% of Gilead's projected remdesivir output of more than 500,000 treatment courses.

[22] AmerisourceBergen is among several distributors that have been sued by West Virginian governments for contributing to the Opioid epidemic, by shipping inordinate amounts of pain medication into the state.

[31] The deal covered the bulk of the grievances against these four companies, including 90 percent of municipal governments, 46 states, and Washington, DC.

[32] On October 1, 2018, Amerisourcebergen agreed to pay $625M to resolve allegations that it had illegally repackaged and distributed oncology-supportive injectable drugs.

[35][36] AmerisourceBergen's stock price reportedly plummeted after they were among other drug distributors who offered $10 billion to settle their portion of the national opioids lawsuit.