How size is measured
There is no single answer to which trucking companies are the biggest, because size can be measured in several ways. The most common measure is annual revenue. Others count the tractors a company runs, the trailers it owns, the drivers it employs or the value of the company on the stock market.
Each measure produces a different order. A company that arranges freight without owning many trucks can have high revenue but a small fleet, while a company with thousands of trucks on regional routes may earn less. Lists also differ in which fiscal year they use and in what they count as trucking revenue, since many large companies also run warehouses, logistics services or international operations.
FullTruckload.com books dedicated trucks for shippers, and knowing how the industry is organized helps explain which kind of carrier fits a load.