ArcBest is a freight transportation and logistics company headquartered in Fort Smith, Arkansas. Its core business is LTL (less-than-truckload) shipping, operated through its ABF Freight subsidiary — one of North America's largest LTL carriers, with 239 service centers serving all 50 U.S. states, Canada, and Puerto Rico. In LTL shipping, multiple shippers share trailer space, making it cost-effective for shippers who don't have enough freight to fill a full truck. ArcBest charges shippers based on weight, dimensions, freight class, lane, and service level. Because most LTL costs are largely fixed, profitability is highly sensitive to volume. Labor is the largest cost at roughly 52% of Asset-Based revenue, and approximately 81% of Asset-Based employees are unionized under a Teamsters contract through June 2028. Beyond LTL, ArcBest operates an Asset-Light segment offering truckload brokerage (via MoLo Solutions, with access to over 70,000 approved carriers), managed transportation, expedite services (via Panther Premium Logistics), international freight forwarding, and U-Pack consumer moving services. In the Asset-Light business, ArcBest earns a margin on the spread between what it charges shippers and what it pays carriers, plus fees for managing customer logistics functions. ArcBest operates two segments: Asset-Based (~66% of revenue) and Asset-Light (~34%). The company serves a highly diversified customer base with no single customer exceeding 3% of revenue, skewing toward manufacturing, industrial, and housing end markets.