Three is still the magic number for pharmacy benefit managers (PBMs).
For 2025, 80% of all equivalent prescription claims were processed by three companies: the CVS Caremark business of CVS Health, the Express Scripts business of Cigna, and the Optum Rx business of UnitedHealth Group. Express Scripts continued to pull ahead of its peers, while CVS Caremark’s claim volume declined for the second year.
Independent PBMs continued to gain business from these larger PBMs, showing fragmentation at the margins. Many smaller PBMs still rely on their larger competitors for claims processing, network management, and rebate negotiation. So even if a plan sponsor chooses an alternative PBM, the Big Three can still win with behind-the scenes economics.
The Big Three PBMs’ dominance persists, but they face growing regulatory and competitive constraints. The largest PBMs are restructuring their businesses in response to client demands, legislative changes, and legal pressures. The emerging Net Pricing Drug Channel will accelerate these shifts, forcing changes in how PBMs generate profits, structure contracts, and justify their role in the drug channel.
For a deeper dive into the state of the industry, register for DCI’s next webinar on April 10, 2026, from 12:00 p.m. to 1:30 p.m. ET. Adam J. Fein and Bryce Platt will unpack the good, the bad, and the ugly of the PBM industry—and explore what it means for you. Click here to learn more and sign up.
