Should You Buy Costco Stock Before Sept. 24?

Costco is scheduled to report fiscal Q4 earnings on Sept. 24 after August comparable sales increased more than 8% overall and roughly 9% in the U.S. Despite solid operating momentum, the stock has gained only 6% year to date versus about 12% for the S&P 500 and trades near 50x trailing earnings. The article argues that the premium valuation, high expectations, economic uncertainty and potential rate hikes limit upside and create greater risk of a post-earnings decline absent an exceptional surprise.

Analysis

The relevant setup is not sales momentum but the gap between Costco's defensive-quality multiple and the incremental evidence required to sustain it. At roughly 50x trailing earnings, a routine beat driven by traffic or ticket growth is unlikely to re-rate COST; the market will focus on whether membership-fee income, renewal rates, gross-margin progression, and international profitability can support a durable acceleration in EPS. A modest guide-down in comp growth or SG&A leverage could produce an outsized 5-10% de-rating over days because the valuation leaves little cushion.

Near-term, the key risk is that a strong monthly sales print has already reduced the information value of the earnings release. The more consequential 1-3 month catalyst is management's FY outlook and any indication that member renewal, discretionary general merchandise, or e-commerce mix is weakening as consumers trade down. COST's low-price positioning should protect revenues better than broadline retail, but that defensiveness can become a relative-performance headwind if rates fall and investors rotate into more cyclically levered retailers.

The contrarian case is that valuation skepticism has become an annual event while Costco repeatedly compounds membership economics and returns capital through special dividends. A post-earnings decline without deterioration in paid-member growth, renewal rates, or merchandise margin would be more likely a tactical entry than a structural short. The bear thesis is falsified if guidance implies accelerating EPS growth sufficient to preserve the premium multiple; it is reinforced if comparable-sales growth decelerates while operating-margin expansion fails to offset it.

Key Decisions for Investors

• Do not add directional COST exposure into earnings solely on monthly sales strength; wait for guidance and membership KPIs. A long is actionable only after a post-print pullback of roughly 7-10% with renewal and margin trends intact.
• For existing COST longs, reduce event exposure or hedge through the report with a 1-2 month put spread; the asymmetry favors protection because an in-line quarter likely has limited upside while a guidance disappointment can trigger multiple compression.
• Tactical relative-value idea: long WMT / short COST over the next 1-3 months in equal dollar amounts. WMT offers more earnings upside from advertising, marketplace and margin mix, while COST carries greater premium-multiple risk; exit if COST's FY guidance shows clear EPS acceleration or the spread moves 8-10% in favor.
• Monitor the earnings call for paid-member growth, renewal rates, gross-margin ex-gas and FY comp guidance. If these remain resilient and COST sells off more than 10%, treat that as a watch-list buy signal rather than maintaining a valuation-driven short.