Founded in 1990, Knight Transportation is a family-owned truckload company that operates more than 25 regional service centers. It maintains a fleet of over 3,600 tractors and nearly 8,500 trailers. The publicly held company operates Knight Refrigerated, which is a wholly owned subsidiary that manages service centers in Arizona, Idaho, Wisconsin and Tennessee. It manages Knight Brokerage, which is subsidiary that offers truckload brokerage services. Knight Transportation serves various industrial hubs and manufacturing centers in the United States, as well as secondary and local markets. It also provides freight tracking and shipping services. The company stocks an inventory of dry vans and refrigerated equipment. Its Squire Transportation division provides training to entry-level drivers. Knight Transportation transports a variety of freight, such as retail and paper products, import and export commodities, consumer staples, plastics and packaging materials. In addition, it operates Knight Truck & Trailer Sales, which is a subsidiary that specializes in the sale and leasing of vehicles from various makes, including Volvo, Peterbilt and Kenworth. With annual sales revenue of more than $500 million, the company employs a work force of over 4,000 people. It is recognized as one of the Top 200 Best Small Companies by the Forbes magazine.