Key Takeaways COST reported a 6% comparable sales increase in May, showing a promising start to fiscal Q4. E-commerce surged 12%, and international comps rose as much as 8.4%, supporting broad-based growth. Net sales climbed 6.8% year over year to $20.97B despite macro and tariff-related uncertainties.Costco Wholesale Corporation’s (COST) 6% increase in May comparable sales signals a promising start to the fourth quarter of fiscal 2025. This figure, which excludes gasoline price fluctuations and foreign e ...