Americans Sold More Cars to Each Other Last Year Than the Entire New Car Industry

About 18 million used cars changed hands in America last year with no dealer involved. That is nearly half of every used vehicle transaction in the country.

It is also more cars than the entire new vehicle industry sold.

Most dealers have never seen that number. Here is where it comes from, why it is almost certainly understated, and what it means for where you buy your inventory.

The math

Cox Automotive put total used vehicle sales at roughly 38.3 million for 2025.

About 20.1 million of those were retail, meaning a franchise or independent dealer sold the car to a customer.

Subtract one from the other and roughly 18.2 million used vehicles moved some other way. Two people, a driveway, and a title.

That is about 47% of the used car market. Call it half.

No auction fee. No floor plan. No dealer on either side of the deal.

Why 18 million is the floor, not the ceiling

Retail sales are easy to count. They run through a DMS, a licensed seller, and a reporting chain built to capture them.

A car sold in a driveway produces a title transfer and not much else. Nothing is designed to tally it.

So the private number is an estimate and the retail number is close to a census. When you compare a count to an estimate, the estimate is the one with room to be wrong.

Eighteen million is the conservative read.

What 18 million actually looks like

• More than the entire US new vehicle market, which finished 2025 at about 16.3 million units.
• Roughly 13 times what CarMax and Carvana sold combined. CarMax moved 789,050 retail used units in its fiscal 2025. Carvana sold 596,641 in calendar 2025.
• Within about 2 million units of every retail dealer in America put together.

That last one deserves a second read. Private sellers are not a side channel sitting off to the edge of the business. They are nearly the size of the entire franchise and independent dealer body combined.

Has private party passed retail? Not yet

You will see people claim it has. It has not, at least not in numbers anyone can verify.

Retail is around 20.1 million. Private is around 18.2 million. Retail is still ahead by roughly 2 million cars.

We are saying that plainly because the trend does not need the exaggeration. The gap has been closing for years. If the undercounting is as real as it looks, the crossover may already have happened quietly. Nobody can prove that yet, and claiming it does not make the case stronger.

The verifiable number is big enough.

Why the industry looked right past it

Not because dealers are slow. Because it was hard.

The auction is one stop. You show up, you bid, you buy twenty cars in an afternoon.

Buying off the street means finding the listing, reaching a stranger, earning enough trust to see the car, and then doing it again. And again.

Any decent buyer can pull five to ten cars a month off Marketplace. That is not a channel. That is a hobby.

So the industry leaned on the lane. And the lane got expensive. Auction costs are up about 36% since 2019.

What it takes to buy at volume

The idea is simple. Buy more from the public and less at the auction. No dealer argues with that.

Execution is where stores stall. Going from five cars a month to forty or sixty is not an effort problem. You cannot out-hustle it with one motivated buyer.

Two things change the math.

Coverage. One person cannot watch every listing in a market. Most of what they do see is junk anyway: dealer posts dressed up as private sellers, salvage titles, cars that sold yesterday. Filtering that out before a human reads it is the difference between a buyer working deals and a buyer scrolling.

A process that does not live in one person's head. If your private party volume collapses when your best buyer takes a vacation, you do not have a channel. You have an employee with a good month.

We wrote our process down. Fifty pages, built from running some of the largest public buy centers in the country, and it is free to take. A buyer at one of our Toyota stores used it in his first month with no prior experience and bought ten cars.

Frequently asked questions

What percentage of used cars are sold private party?

About 47% of US used vehicle transactions happen between private parties with no dealer involved. That comes from Cox Automotive's 2025 figures: roughly 38.3 million total used sales against about 20.1 million retail.

How many used cars are sold private party each year?

Roughly 18 million a year in the United States. For scale, the entire new vehicle market was about 16.3 million units in 2025.

Is the private party market bigger than dealer retail?

Not yet. Retail was about 20.1 million in 2025 against roughly 18.2 million private party. The gap has narrowed for years, and because private sales are estimated rather than counted directly, the real figure may be higher than what gets reported.

Where do private party cars get listed?

Mostly Facebook Marketplace, Craigslist and OfferUp, with more on Autotrader and Cars.com private seller listings. In most markets the volume sits on Marketplace.

How many private party cars can one buyer realistically buy in a month?

Working by hand, five to ten is a normal month. Stores doing forty or more have a filtering system and a written process behind the buyer, not just more hours in the day.

Why do dealers want private party cars?

You pick the car, the price and the timing, and there is no auction fee or transport cost stacked on top. The cars also tend to need less recon than lane cars, because they came from someone who was actually driving them.

Sources

Cox Automotive 2025 used and new vehicle sales data. CarMax fiscal 2025 results. Carvana full year 2025 results.

Keep reading

• How VETTX works
• Real dealer results
• The private party acquisition playbook