Top PBMs by market share

The PBM market is dominated by three major players, who together handled about 76 percent of all prescription claims in 2018, according to Drug Channels Institute.

A breakdown of PBM market share, by total equivalent prescription claims managed in 2018:

1. Caremark (CVS Health) / Aetna: 30 percent

2. Express Scripts: 23 percent

3. OptumRx (UnitedHealth): 23 percent

4. Humana Pharmacy Solutions: 7 percent

5. MedImpact Healthcare Systems: 6 percent

6. Prime Therapeutics: 6 percent

7. All other PBMs + cash pay: 4 percent

Read the full report here.

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