To assess market share, HIRC used self-reported data from 29 pharmacy benefit manager leaders collected in December 2020 and January 2021.
A breakdown of PBM market share, by total adjusted prescription claims managed in 2020:
1. CVS Caremark: 34 percent
2. Express Scripts: 24 percent
3. OptumRx (UnitedHealth): 21 percent
4. Humana Pharmacy Solutions: 8 percent
5. Prime Therapeutics: 6 percent
6. MedImpact Healthcare Systems: 5 percent
7. All other PBMs: 3 percent