
Today, three PBMs, CVS Caremark (34% market share), Express Scripts (23%, owned by Cigna’s Evernorth), and Optum Rx (22%, owned by UnitedHealth Group), control nearly 80% of all U.S. prescription claims. In exchange for placing a manufacturer’s drug on the formulary, or giving it preferred status over competing therapies, the PBM negotiates rebates, administrative fees, and performance payments from the manufacturer. A portion of those payments flows back to the health plan, while the PBM retains part of the negotiated revenue.
One feature of today’s market that surprises many people is how vertically integrated it has become. The largest PBMs are no longer independent middlemen. They sit inside healthcare conglomerates that also own insurers, pharmacies, physician groups, specialty pharmacies, and mail-order pharmacies. For example, CVS Health owns Aetna, CVS Caremark, CVS Pharmacy, MinuteClinic, and Signify Health. UnitedHealth Group owns UnitedHealthcare, Optum Rx, and Optum Health. Cigna owns Express Scripts through Evernorth. This consolidation has fueled ongoing debate about whether these organizations can optimize each part of the supply chain independently or whether incentives increasingly favor the parent company as a whole. Mark Cuban on Breaking the Drug Pricing Cartel: Inside Cost Plus Drugs – https://pearhealthcareplaybook.substack.com/p/mark-cuban-on-breaking-the-drug-pricing
Hat Tip – https://ritholtz.com/2026/08/10-sunday-reads-239/
Yikes.




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