The USC study analyzed 9.5 million prescriptions filled during the first half of ... Three large PBMs—CVS Caremark, Express Scripts and OptumRX—control more than two-thirds of the market.

But recently, increases in consolidation (with the three leading PBMs—CVS Caremark, Express Scripts, and OptumRX—controlling ... or not filling prescriptions. And they could harm pharmacies ...

The Justice Department on Wednesday accused CVS Pharmacy of incentivizing pharmacists to fill illegal opioid prescriptions for more than a decade, a practice that fueled the nation’s opioid crisis.