Costco Wholesale Corporation (NASDAQ: COST) Navigates Q4 Earnings Outlook Amidst Strong E-commerce Growth

Font: Financial Modeling Prep  • Sep 16, 2026

• Analyst firm Oppenheimer Holdings Inc. (NYSE: OPY) maintains an "Outperform" rating for Costco, despite concerns about potential Q4 earnings missing estimates.
• Costco shares experienced a 6.2% decline over the past month, a more significant drop than the S&P 500 but less severe than its industry peers.
• The company demonstrates robust digital momentum, with e-commerce sales surging 17.9% in August and 20.9% for fiscal year 2026, attracting increased institutional investment.

Costco Wholesale Corporation (NASDAQ: COST) is a global retailer that operates a chain of membership-only warehouse clubs. The company offers a wide range of products, from groceries to electronics, often in bulk quantities. Its business model focuses on high sales volume and rapid inventory turnover, competing with other retailers like Walmart (NYSE: WMT)'s Sam's Club and BJ's Wholesale Club Holdings, Inc. (NYSE: BJ).

On September 16, 2026, investment firm Oppenheimer maintained its "Outperform" rating for Costco, with the stock priced around $897.42. An Outperform rating means the analyst expects the stock to perform slightly better than the overall market. However, the firm also noted that Costco's core earnings for the fourth quarter could potentially miss analyst estimates.

This concern aligns with the stock's recent performance. Over the past month, Costco shares have declined by 6.2%. This drop is more significant than the S&P 500 composite's 2.4% decrease but is less severe than the 9% loss seen across the Zacks Retail - Discount Stores industry, to which Costco belongs.

Despite the stock's decline, the company shows strong momentum in its digital operations. E-commerce sales for Costco surged by 17.9% in August and increased by 20.9% for the full fiscal year of 2026. This digital growth is a key factor supporting the company's overall performance, as highlighted by Zacks Equity Research.

Institutional investors appear to share a positive long-term view. NorthRock Partners LLC increased its stake in Costco by 11.3% in the most recent quarter, as highlighted by DefenseWorld.net. Similarly, Sarasin and Partners LLP expanded its holdings by 6.9%, showing continued confidence from large investment firms.