Costco stock fell approximately 4% after the retailer reported June net sales of $29.24 billion, up 10.6% year-over-year for the five weeks ended July 5, 2026, signaling that even strong top-line growth wasn’t enough to satisfy investors pricing in uninterrupted acceleration.
The headline numbers looked impressive on their face. Net sales reached $29.24 billion, and U.S. comparable sales climbed 10.6%. Digitally enabled comparable sales jumped nearly 21%, and the company declared its regular quarterly dividend of $1.47 per share. Yet the stock slipped to about $913, roughly 17% below its 52-week high, as investors focused on what lay beneath the surface.
The issue was deceleration. Strip out gasoline prices and foreign exchange rates—two variables Costco doesn’t control—and June comparable sales growth cooled to 7%, down from May’s 8% adjusted figure. On that adjusted basis, U.S. comparable sales rose 7.6% in June, a step down from 8.7% in May. Total company comparable sales rose 8.8% for the month, still healthy but slower than the prior two months.
The slowdown reflects a shift in momentum even as underlying demand remains solid. Costco’s adjusted comparable sales for the first 44 weeks of its fiscal year are running at a healthy 6.7%, and membership renewals continue at rates most retailers can only envy. The e-commerce acceleration—with adjusted digitally enabled sales hitting 21.5%—shows that customers are still engaging strongly with the company’s online channels.
The real pressure on the stock stems from valuation. Costco trades at about 46 times earnings, down from the mid-50s earlier this year but still rich compared to the S&P 500’s roughly 25 times. That premium has long reflected investor confidence in the company’s consistency and recurring membership revenue. The problem, according to market observers, is what that valuation already prices in: years of uninterrupted mid-to-high single-digit comparable sales growth with no soft patches allowed.
When monthly updates show growth cooling, even modestly, the reaction can appear outsized relative to the news. A 7% adjusted comparable sales figure would be a triumph at most retailers. At Costco’s valuation, however, it may not be enough to live up to investors’ expectations. The company’s June results represent a small reminder that growth ebbs and flows, even at a business this well-run.
Sources
- Costco Investor Relations — June sales announcement reporting $29.24 billion in net sales, up 10.6% year-over-year
- The Motley Fool — Analysis of stock decline and comparable sales slowdown from May to June
- Barron’s — Reporting that net sales rose 10.6% in June, below May’s 14.5% gain
- Zacks Investment Research — Comparable sales data showing 8.8% total company growth and adjusted figures
