WST vs GPC Comparison

West Pharmaceutical Services is based in Pennsylvania and is a key supplier to firms in the pharmaceutical, biotechnology, and generic drug industries. West sells elastomer-based packaging components (including stoppers, seals, and plungers), nonglass containment solutions, and auto-injectors for injectable drugs, which include large-molecule biologics, peptides such as GLP-1 receptor agonists, and small-molecule drugs. The company reports in two segments: proprietary products (about 80% of total revenue) and contract-manufactured products (about 20% of total revenue). It generates approximately 55% of its revenue from international markets and 45% from the United States.

Genuine Parts sells aftermarket automotive parts (60% of sales) and industrial products (40% of sales) in the United States and internationally. The automotive segment primarily acts as a distributor to its network of 9,800 global retail locations, of which about two-thirds are independently owned and operated. We estimate Genuine serves around 6,000 retail locations in the US operating under the Napa Auto Parts brand, with about 80% of end-market sales derived from professional customers. Its industrial segment, primarily operating under the Motion name in the United States, is a leading distributor of bearings, power transmission, and other industrial products to more than 200,000 maintenance, repair, and original equipment manufacturer customers.