US wholesale inventories posted a 0.7% September gain, besting the 0.6% predicted.

• The prior reading was a 0.5% rise.
• Wholesale sales, meanwhile, gained 2.8% after an originally reported 1.8% gain in the preceding period (subsequently revised to 2.0%).

The inventory data provides a somewhat constructive contribution to the third-quarter GDP picture.

As a backdrop, the Census Bureau puts out its Monthly Wholesale Trade: Sales and Inventories release at 10 am Eastern, usually five to six weeks after the month in question. The report covers merchant wholesalers — firms that purchase from producers and resell to retailers, businesses and institutional buyers, while leaving out the producers' own distribution arms.

The lead number in the release is the change in wholesale inventories on a monthly basis. An initial estimate comes out one to two weeks earlier via the Advance Economic Indicators report, so the subsequent full report generally refines an already public figure. The full data also incorporates wholesale sales and a granular split between durable items (machinery, autos and parts, metals, lumber, electrical equipment) and nondurables (groceries, drugs, chemicals, petroleum, farm products).

The inventory-to-sales ratio measures stock clearance time in months at the prevailing sales speed. An increasing ratio might indicate weakening demand or intentional accumulation; a decreasing ratio points to slender inventories and possible replenishment. Because the figures are in current dollars, price moves — especially in petroleum — can alter the totals without any change in physical volume.

The report's principal function is GDP monitoring. Private inventory changes are a highly unstable element in quarterly expansion, and the wholesale data helps shape the estimates of economists and nowcasting models for this category.

Wholesale inventory data only infrequently stirs financial markets. It has received greater scrutiny lately as tariff-motivated hoarding and later reductions have brought about notable swings in inventory investment, warping the quarterly GDP readings.