Wholesale Used-Vehicle Prices Fall 1% in First Half of September

Why it matters

The mid-month result changes the direction of the national comparison. Manheim's final August index was still 0.4% above the prior year; the preliminary September reading is 0.4% below it. That does not establish a sustained downturn, but it gives used-vehicle departments a fresh reason to test assumptions carried forward from the tighter spring and summer market.

Supply and conversion moved in the same cautious direction. Cox put wholesale supply at 27.8 days on September 15, roughly 2.4 days above a year earlier, while sales conversion averaged 55.8%—below both August and the year-ago period.

A softer national index can improve buying opportunity, but it can also expose aged units acquired against earlier price expectations. Dealers need separate controls for new acquisitions and existing inventory rather than lowering every appraisal or retail price by the same percentage.

The early-month decline is broader than one adjustment

Non-adjusted wholesale prices fell 1.1% from August during the first half of September and were also 1.1% below the prior year. Cox said the long-term average non-adjusted move is a 0.3% decline for the full month of September, so the early decrease was larger than the typical complete-month seasonal move.

The three-year-old vehicle index declined 0.8% from the beginning of the month. MMR retention averaged 99.6%, slightly above August and the year-ago period, even as conversion softened. Those measures describe different parts of auction performance and should not be collapsed into a single claim about demand.

The report remains preliminary. Cox plans to release the complete September Manheim data on October 7, and later transactions can change the final monthly direction and magnitude.

Fuel-efficient segments held the annual advantage

Compact cars and electric vehicles were the only major segments with wholesale values above September 2025, according to Cox. The EV index was up 2.3% year over year but down 1.3% from August, showing that a positive annual comparison can coexist with current-month cooling.

Non-EV values were down 1.3% from a year earlier and 1.4% from August. Cox linked the relative performance of compact cars and EVs to possible demand for fuel-efficient vehicles as fuel prices rose, but that is an interpretation of the market pattern rather than proof that fuel costs caused an individual sale or price change.

Dealers should verify the pattern locally by model, price band and days to turn. Powertrain averages do not account for battery condition, charging practicality, incentive history or the large differences among individual EV nameplates.

Translate the index into store-level controls

Acquisition teams can compare recent bids, wins and misses with updated MMR, local retail supply and expected reconditioning. Vehicles purchased against spring or early-summer assumptions deserve an aged-inventory review based on current replacement cost and retail demand, not an automatic markdown.

Management should monitor cost-to-line, appraisal close rate, auction conversion, days to frontline, retail turn and wholesale exit loss by age and price band. Those measures reveal whether the national softening is actually reaching the store's inventory.

Because the September result is incomplete, permanent changes to stocking levels or appraisal policy should wait for corroboration from local transactions and the final monthly report.

AI-assisted reporting disclosure

This article was researched and generated with AI-assisted systems using the Cox Automotive reference listed below. Dealership Tech Report applies automated accuracy and risk checks, but preliminary market data can change. Verify vehicle-specific values and final monthly results before acting.