Walgreens is an American company that operates the second-largest pharmacy store chain in the United States, behind CVS Health. It specializes in filling prescriptions, health and wellness products, health information, and photo services. It was founded in Chicago in 1901, and is headquartered in the Chicago suburb of Deerfield, Illinois. On December 31, 2014, Walgreens and Switzerland-based Alliance Boots merged to form a new holding company, Walgreens Boots Alliance. Walgreens became a subsidiary of the new company, which retained its Deerfield headquarters and trades on the Nasdaq under the symbol WBA. In 2021 the company was found by a federal jury to have substantially contributed to the opioid crisis.

CVS Health Corporation is an American healthcare company that owns CVS Pharmacy, a retail pharmacy chain; CVS Caremark, a pharmacy benefits manager; and Aetna, a health insurance provider, among many other brands. The company is the world's largest healthcare company, and its headquarters are in Woonsocket, Rhode Island. In 2023, the company was ranked 65th in the Forbes Global 2000.