Quick answer: The largest trucking companies in the US are a mix of truckload carriers, less-than-truckload (LTL) carriers, and huge private fleets run by retailers and parcel giants. Widely recognized names among the biggest include truckload leaders like Knight-Swift, Schneider, Werner, and J.B. Hunt; LTL leaders like FedEx Freight, Old Dominion, XPO, Estes, and Saia; and private fleets like Walmart, PepsiCo, UPS, and FedEx. But "largest" depends entirely on how you measure it — revenue, tractor count, or segment — and the exact order shifts every year, so this overview focuses on how the industry is structured rather than a leaderboard that's out of date the day it's published.
Key takeaways
- "Largest" can mean revenue, number of trucks, or number of drivers — different measures produce different lists.
- The market splits into truckload, LTL, and private fleets, and the biggest names in each are largely different companies.
- US trucking is enormous but fragmented: the giants are household names, yet the vast majority of carriers are small fleets — which is who most software and freight is actually built around.
First: what does "largest" even mean?
Before naming anyone, it's worth knowing that "largest trucking company" isn't one ranking — it's several, depending on the yardstick:
- By revenue — total dollars the carrier books in a year. This is the most common ranking basis (industry lists like the Transport Topics Top 100 use it).
- By fleet size — number of tractors or power units operated.
- By segment — a company can be #1 in LTL and not appear on a truckload list at all, because they're different businesses.
A carrier can be huge by revenue but run fewer trucks than a competitor that hauls lower-value freight, so the "biggest" label always needs a "by what?" attached.
The largest truckload (TL) carriers
Truckload carriers move full trailers of freight from one shipper to one destination. The segment's best-known large players include Knight-Swift (formed by the merger of Knight Transportation and Swift, widely described as the largest truckload carrier in North America), Schneider National, Werner Enterprises, and J.B. Hunt (which is also a leader in intermodal). These are publicly recognized giants operating thousands of tractors across the country.
The largest less-than-truckload (LTL) carriers
LTL carriers combine freight from multiple shippers onto one trailer, running a hub-and-terminal network. The biggest names here are largely separate from the truckload leaders and include FedEx Freight, Old Dominion Freight Line, XPO, Estes Express Lines, Saia, and ArcBest (ABF Freight). LTL is a network business — terminals, linehaul, and pickup-and-delivery — so scale looks different than in truckload.
The largest private fleets
A private fleet is a company that runs its own trucks to move its own goods rather than hauling for hire. Some of the largest trucking operations in the country are private fleets you'd never find on a "for-hire carrier" list: Walmart, PepsiCo, and the parcel networks of UPS and FedEx all operate enormous fleets. By raw truck count, several private fleets rival or exceed the biggest for-hire carriers.
Where to find the current, exact rankings
Because revenue and fleet figures change every year, the responsible place to get a precise, up-to-date ranking is a primary source rather than a blog:
- Transport Topics Top 100 — the industry's widely cited annual ranking of the largest for-hire carriers by revenue.
- FMCSA data — the federal registry behind every carrier's USDOT number, useful for verifying fleet size and safety data.
- Public company filings — the publicly traded carriers above report revenue and fleet metrics in their annual reports.
If you need a numbered list with this year's exact figures, those sources will always be more current and accurate than a static article.
The part most carriers miss: the industry is mostly small
Here's the context that matters if you actually run trucks: for all the giants above, US trucking is overwhelmingly a small-business industry. The large majority of carriers operate a handful of trucks, not thousands. The FMCSA's registry is dominated by fleets you've never heard of — and that's where most of the freight, and most of the growth, actually happens.
That's worth remembering when you're choosing tools or benchmarking your operation. The systems the mega-carriers run are built for IT departments and multi-terminal networks most fleets will never have. What a growing carrier needs is software that does the same core jobs — dispatch, accounting, safety, driver pay — without the enterprise weight. (We break down how to pick one in Best Transportation Management Software.)
The bottom line
The largest US trucking companies are a mix of truckload leaders (Knight-Swift, Schneider, Werner, J.B. Hunt), LTL leaders (FedEx Freight, Old Dominion, XPO, Estes, Saia), and giant private fleets (Walmart, PepsiCo, UPS, FedEx) — but the "biggest" title always depends on whether you're counting revenue, trucks, or a specific segment, and the exact order changes yearly. For current numbers, go to the Transport Topics Top 100 or company filings. And if you're one of the small and mid-size carriers that make up most of the industry, the goal isn't to run what the giants run — it's to run the same operation, simpler. Yolda is built for exactly that: one platform from your first truck to your thousandth.
Company sizes and rankings change every year. Confirm current figures against primary sources such as the Transport Topics Top 100, FMCSA data, and company financial filings.
