Old Dominion Freight Line, Inc. operates as a less-than-truckload (LTL) motor carrier in the United States and North America. It provides regional, inter-regional, and national LTL services, including expedited transportation.

Marten Transport, Ltd. operates as a temperature-sensitive truckload carrier for shippers in the United States, Canada, and Mexico. It operates through four segments: Truckload, Dedicated, Intermodal, and Brokerage.

Werner Enterprises, Inc., a transportation and logistics company, engages in transporting truckload shipments of general commodities in interstate and intrastate commerce in the United States, Mexico, and internationally.

Knight-Swift Transportation Holdings Inc., together with its subsidiaries, provides truckload transportation services in the United States, Mexico, and Canada. The company operates through four segments: Trucking, Logistics, Less-than-truckload (LTL), and Intermodal.

Heartland Express, Inc., together with its subsidiaries, operates as a short-to-medium haul truckload carrier in the United States and Canada. It primarily provides nationwide asset-based dry van truckload service for shippers from Washington to Florida and New England to California; and temperature-controlled truckload services.

Universal Logistics Holdings, Inc. provides transportation and logistics solutions in the United States, Mexico, Canada, and Colombia. It offers truckload services, which include dry van, flatbed, heavy-haul, and refrigerated operations; domestic and international freight forwarding, and customs brokerage services; and final mile and ground expedite services.

Schneider National, Inc., together with its subsidiaries, provides surface transportation and logistics solutions in the United States, Canada, and Mexico. The company operates through three segments: Truckload, Intermodal, and Logistics.

Saia, Inc., through its subsidiaries, operates as a transportation company in North America. The company provides less-than-truckload services for shipments between 400 and 10,000 pounds; and other value-added services, including non-asset truckload, expedited, and logistics services.

Covenant Logistics Group, Inc., together with its subsidiaries, provides transportation and logistics services in the United States. It operates through four segments: Expedited, Dedicated, Managed Freight, and Warehousing.