Costco Stock (COST) Today: Roth Downgrade Ignites Valuation Debate as Analysts Split on 2026 Upside
December 15, 2025 — Costco Wholesale Corporation (NASDAQ: COST) stock traded lower on Monday as Wall Street digested a fresh downgrade that zeroed in on a key investor question heading into 2026: Is Costco’s premium valuation still justified if membership and traffic trends cool, even slightly? StockAnalysis As of the latest available trading data, COST changed hands around the mid-$870s, down about 1% on the day, after opening near $883 and dipping as low as the mid-$874s in early trading. StockAnalysis What’s driving Costco stock on December 15, 2025 Roth turns bearish: “Small misses” could trigger a re-rating The most