PBMs

Headquartered in Greater St. Louis within unincorporated North St. Louis County, Missouri, Express Scripts provides integrated pharmacy benefit management services including network-pharmacy claims processing; home delivery pharmacy services; specialty pharmacy benefit management, through its subsidiary Accredo; benefit-design consultation; drug-utilization review; formulary management; and medical and drug data analysis services to manage drug plans for health plans, self-insured employers and government agencies (both as administrator of employee benefits and public assistance programs). One of its largest clients is the United States Department of Defense's Tricare program.

CVS Caremark (formerly Caremark Rx) (previously CVS/caremark) is the prescription benefit management subsidiary of CVS Health, headquartered in Woonsocket, Rhode Island.

OptumRx is a pharmacy care services company helping clients and more than 66 million members achieve better health outcomes and lower overall costs through innovative prescription drug benefits management services, including network claims processing, clinical programs, formulary management and specialty pharmacy care.