Costco Wholesale Corp. reported a 13% year-over-year increase in net sales for September. Net sales reached $30.02 billion for the five-week retail month.

Comparable sales grew 11.4% across the company. U.S. comparable sales rose 12.5%.

Excluding gasoline prices and foreign exchange, comparable sales increased 7.6%. This metric indicates solid underlying business health and an acceleration from prior months.

E-commerce sales surged 19% during the period. Costco's stock remained flat in after-hours trading, suggesting the results aligned with investor expectations.