Costco's monthly sales are on a roll, thanks to surge in online orders

Costco reported robust August sales, with net sales increasing 8.7% to $21.56 billion and total same-store sales rising 6.3%, surpassing Wall Street's 6% consensus. This strong performance, notably driven by an 18.4% surge in online sales and a 2.2% increase in average transaction size, helps to alleviate recent investor concerns regarding a potential slowdown in the retailer's business. The positive results are particularly significant given Costco's recent stock underperformance compared to the broader market and ongoing worries about U.S. consumer health.

Analysis

Costco Wholesale Corp. (COST) delivered a robust sales report for August, potentially alleviating recent investor concerns about a slowdown. The company reported an 8.7% year-over-year increase in net sales to $21.56 billion, supported by total same-store sales growth of 6.3%, which modestly surpassed the FactSet consensus estimate of 6.0%. A key driver of this outperformance was the digital channel, with online sales surging 18.4%. Furthermore, a 2.2% increase in average transaction size indicates healthy consumer spending per visit, with core categories like fresh foods showing mid- to high single-digit growth. This fundamental strength contrasts with the stock's recent market underperformance, having fallen 9% in the past three months against an 8% rise in the S&P 500. The strong operational data provides a positive lead-in to the September 25 quarterly earnings report, where analysts already forecast significant growth, and may challenge the bearish sentiment driven by broader economic and tariff-related anxieties.

Key Decisions for Investors

• Given the disconnect between strong fundamental performance, including a 6.3% same-store sales beat, and the stock's recent 9% decline, investors may consider the current valuation an attractive entry point ahead of the September earnings release.
• Monitor the upcoming earnings call for management's commentary on the sustainability of online sales growth and the effectiveness of its tariff mitigation strategies, as these are critical factors for the forward-looking thesis.
• Investors concerned about the health of the U.S. consumer should note the 2.2% growth in average transaction size and strength in fresh foods, which suggest Costco's value proposition is resonating well in the current economic environment.
• Considering the stock's year-to-date underperformance relative to the S&P 500, this strong sales data could act as a catalyst to close the performance gap, warranting a review of underweight positions in the name.