Costco Wholesale Corporation (COST) vs Merck & Co., Inc. (MRK)

Founded in 1983, Costco Wholesale Corp operates a global network of membership-only warehouse clubs focused on offering high-quality products and services at consistently low prices. In its latest fiscal year, the company ran approximately 910 warehouses and served more than 80 million members across three geographic segments: Costco U.S., which generated about 73% of total revenue, Costco Canada at 13%, and Costco International at 14%. Costco’s core value proposition—quality merchandise at highly competitive prices—has supported strong membership renewal rates, reaching 93% in the U.S. and Canada and nearly 90% internationally. Roughly 55% of fiscal 2025 revenue came from grocery sales, while general merchandise contributed another 25%.

Merck & Co., Inc. develops pharmaceutical products across multiple therapeutic areas, including cardiometabolic disorders, oncology, and infectious diseases. In cancer treatment, its immuno-oncology portfolio, led by Keytruda, represents a significant driver of total revenue. The company also maintains a strong vaccines business focused on preventing pediatric illnesses, alongside Gardasil for human papillomavirus. In addition, Merck markets animal health products. Geographically, 47% of the company’s sales come from its U.S. human health segment, which includes pharmaceuticals and vaccines.