Big Three Market Share
| PBM | Parent Company | Market Share | Owned Pharmacies |
|---|---|---|---|
| CVS Caremark | CVS Health | ~30% | CVS Pharmacy, Aetna |
| Express Scripts | Cigna/Evernorth | ~25% | Express Scripts mail order |
| OptumRx | UnitedHealth Group | ~25% | OptumRx mail order, specialty |
Vertical Integration Conflicts
Vertical integration — PBMs owning pharmacies, insurers, and specialty pharmacies — creates significant conflicts of interest. A PBM that owns a specialty pharmacy has a financial incentive to direct specialty prescriptions to its own pharmacy — even if a competitor offers better pricing. A PBM that owns an insurer has a financial incentive to design formularies that benefit the insurer — not the employer.
Independent PBM Alternatives
IQ Insight
Independent and transparent PBMs — companies like Capital Rx, SmithRx, and Navitus — offer an alternative to the Big Three. These PBMs typically offer pass-through pricing, full transparency, and no vertical integration conflicts. They are growing rapidly as employers seek better terms and greater transparency. For employers with 200+ employees, independent PBMs are worth evaluating.