Advance Auto Parts is one of the industry's largest retailers of aftermarket automotive parts, tools, and accessories to do-it-yourself (DIY) customers in North America. Advance operated 5,109 stores as of the end of 2018, in addition to servicing 1,231 independently owned Carquest stores. The company's Worldpac unit is a premier distributor of imported original-equipment parts. Advance derived 58% of its 2018 sales from commercial clients, up from 30%-40% before the General Parts deal.