Pharmacy services administrative organizations (PSAOs), which operate between pharmacy benefit managers (PBMs) and smaller pharmacies, are among the most mysterious—and misunderstood—intermediaries in our complex U.S. drug channel.
Adding to the mystery: the largest PSAOs are owned by the three multi-billion dollar, public companies that also dominate pharmaceutical distribution—Cencora, Cardinal Health, and McKesson. These companies sit atop the Fortune 500 list and distribute more than 96% of prescription pharmaceuticals in the U.S.
Below, we draw on data from our forthcoming 2025-26 Economic Report on Pharmaceutical Wholesalers and Specialty Distributors to profile the largest PSAOs and highlight crucial business trends affecting each company. We also examine how wholesalers are leveraging PSAOs as part of a broader vertical integration strategy that is building significant positions in businesses beyond drug distribution.
So, buckle up and let’s take a trip through the tollbooth to visit yet another overlooked—but powerful—corner of the drug channel.
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