Key Takeaways Costco posts Q4 net sales of $84.4B, up 8% from last year, with broad-based comparable sales growth.Costco's membership renewal rates above 90% highlight loyalty and provide a dependable revenue stream.E-commerce comparable sales surged 13.6% in Q4, fueling Costco's domestic and international expansion.As Costco Wholesale Corporation (COST) prepares to unveil its fourth-quarter fiscal 2025 earnings results on Sept. 25, after the market closes, investors face an important decision: Should they ...