W.W. Grainger, Inc. (GWW)

Founded in 1927, W.W. Grainger originally distributed various motors via a mail-order catalog. Over the course of the 20th century, the firm expanded into new industrial product categories and launched its first digital catalog in 1995. Today, the company organizes itself into two segments focused on different customer bases. Its larger segment, high-touch solutions, offers a vast array of maintenance, repair, and operations, or MRO, supplies and bespoke inventory management services to larger businesses. Its smaller segment, endless assortment, operates two online platforms, Zoro and MonotaRO, that offer comprehensive catalogs of MRO supplies to smaller businesses. Grainger has operations throughout the world but primarily generates sales within the US.