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