West Pharmaceutical Services, Inc.

West Pharmaceutical Services, Inc. is an American manufacturer of integrated containment and delivery systems for injectable drugs, generating $3.07 billion in net sales in fiscal 2025. Its components — elastomeric stoppers, plungers, seals, syringe components — sit between a drug and its container, a position that makes the company effectively mandatory for the safety of any injectable pharmaceutical. Founded in 1923 by Herman O. West in Philadelphia, the company today supplies virtually every major biologic, generic, and pharmaceutical manufacturer in the world, with its top ten customers accounting for 47.6% of sales.

This is a story about a franchise that looks like a razor-and-blade model but behaves more like a toll bridge. West's Proprietary Products segment — which supplies the primary packaging components that must pass regulatory qualification for each drug — embeds the company so deeply into its customers' manufacturing processes that switching costs are prohibitive. That structural advantage has produced gross margins in the 40% range on proprietary products, generated operating cash flow that has averaged over $700 million annually across the last three years, and supported thirty-three consecutive years of dividend increases. The file turns on a single question: whether the GLP-1 and biologics tailwind that has powered West's high-value-product growth can outlast the oral-delivery threat that could shrink the injectables addressable market.