Costco’s shares surged 10% in the first two weeks of January after the company reported a 6.5% year-over-year increase in same-store sales for December, outpacing analyst expectations of around 4%. Driven by strength in grocery, electronics and seasonal merchandise, the warehouse operator posted its highest single-month sales growth since November 2024. Membership renewal rates held steady at 91.8%, underscoring consistent consumer loyalty. Technical indicators also flashed a bullish breakout, with the stock moving above its 200-day moving average on January 12, signaling a potential shift in medium-term momentum.

In a recent Big 3 segment, veteran strategist Don Kaufman outlined a bearish thesis on Costco, citing valuation concerns and margin pressure from rising labor and logistics costs. Kaufman pointed to a 28% run-up in the share price over the past six months and suggested that downside risks could accelerate if macro headwinds persist. He recommended a puts spread—buying February 25-delta puts while selling February 15-delta puts—to profit from a potential pullback toward the 50-day moving average near the $560 level. Implied volatility at 22% remains elevated, offering attractive premiums for option sellers looking to hedge against a correction.

Despite short-term volatility, Costco’s underlying fundamentals support a compelling long-term case. The company’s membership model generates roughly $5 billion in annual fee income, representing nearly 2% of total revenue and offering high-margin, recurring cash flow. With gross margins expanding to 14.5% in fiscal 2025 and capital expenditures forecast at $4.7 billion to add new warehouse locations, Costco’s scale barrier remains formidable. Over the past decade, compounded annual revenue growth of 7.2% and a three-year average free-cash-flow yield above 4% underscore its potential to deliver millionaire-maker returns for patient shareholders.