McKesson's Position in the Drug Distribution Oligopoly Warrants a Narrow Moat

McKesson is a leading domestic wholesaler of branded, generic, and specialty pharmaceutical products. With over $180 billion in annual U.S. drug distribution revenue, McKesson supplies nearly one third of the overall market, comparable to AmerisourceBergen and slightly outpacing Cardinal Health in market share. Together, the three operate as a pharmaceutical wholesale and distribution oligopoly, supplying over 90% of the U.S. market. The highly consolidated pharmaceutical wholesale market reflects the substantial scale-based cost advantages held by the largest players.