Costco Wholesale shares fell more than 4% on Thursday even after the retailer reported strong June sales, as investors focused on regional softness, currency pressure and the stock’s rich valuation after a long run. The company said net sales stood at $29.24 billion for the five weeks ended July 5, 2026, up 10.6% from the same period last year. Comparable sales in the US also rose 10.6%, showing that demand in its largest market remained healthy.
Canada, however, was weaker. Comparable sales there rose 3.7%, well below the pace seen in the US. The gap between the two regions drew investor attention, as it showed that Costco’s headline growth was not evenly spread across markets.
For the first 44 weeks of the fiscal year, Costco reported net sales of $250.43 billion, up 10.1% from a year earlier. The company also flagged gasoline price deflation and foreign exchange as headwinds.
The numbers were not weak. In fact, Costco continues to show stronger sales momentum than many large retailers. Its membership-led model, bulk-buying format and strong customer loyalty have helped it perform well even when consumer spending has been uneven.
Still, the stock fell as investors appeared to want more than solid sales growth. Costco has traded at a premium valuation for years because of its consistent execution and defensive business model. That means even good updates can sometimes fail to support the stock if investors believe expectations are already high.
The regional split also mattered. US comparable sales growth of 10.6% was strong, but Canada’s 3.7% growth pointed to a more uneven international picture. Currency movements and local demand trends can affect reported numbers, especially for companies with a large global footprint.
Gasoline price deflation was another factor. Fuel sales can influence reported revenue for warehouse retailers. When gas prices fall, total sales growth can look softer even if customer traffic and core merchandise sales remain steady.
The fall in Costco shares also comes at a time when investors are more selective with consumer stocks. Companies with high valuations are being judged more strictly, especially when parts of the business show slower growth or when external factors such as foreign exchange weigh on results.
