CVS Health is the largest company that has operations solely in the United States, operating close to 10,000 stores throughout the country. It was founded in 2007 through a merger between CVS Pharmacy and Caremark Rx. CVS Health has 203,000 employees. In 2021, U.S. pharmacies and drug stores generated over 320 billion U.S. dollars in sales. CVS Pharmacy is currently the largest pharmacy chain in the United States by number of locations