Is Costco (COST) Stock a Buy, Sell, or Hold in 2026?

Core Business Performance - Costco's core business is thriving, allowing it to sell products at low margins due to significant profits from membership fees [3] - The company maintains a narrower product selection compared to superstores, which helps control inventory and costs [4] - Key performance metrics such as comparable store sales, new warehouse openings, cardholder growth, and renewal rates have all increased from fiscal 2020 to fiscal 2025 [5][6] Membership and Pricing Strategy - Costco raised its membership fees for the first time in seven years in September, yet continued to attract new cardholders and maintain high renewal rates [7] - The pricing power from membership fees helps mitigate inflationary pressures on product sales [7] Stock Performance and Valuation - Costco's stock has underperformed the market, declining over 10% in the past 12 months while the S&P 500 rose 16% [1] - High valuations and low yield are limiting the stock's upside potential, although it remains a solid long-term investment [8] - In the first quarter of fiscal 2026, adjusted comparable sales rose 6.4%, with an increase in warehouse count to 923 locations and a total of 145.9 million cardholders [9]