UBS reiterates Costco stock Buy rating ahead of quarterly results

UBS reiterated a Buy on Costco with a $1,275 price target, implying roughly 43% upside from the $893.74 share price, ahead of its September 24 fourth-quarter results. Costco generated 9.2% trailing-12-month revenue growth, while RBC forecasts Q4 revenue growth of 11% and adjusted EPS of $6.54, above consensus expectations of 10% and $6.50. The outlook is broadly constructive, though analysts flag moderating momentum and a premium 45.0x P/E valuation that could amplify any KPI disappointment.

Analysis

COST’s near-term setup is asymmetric in the wrong direction: a premium multiple leaves little room for merely solid execution, while the earnings bar appears to have moved above consensus as sell-side estimates cluster toward upside. The September 24 print matters less for headline sales than for renewal trends, U.S. traffic versus ticket, discretionary mix, and SG&A leverage; any evidence that incremental sales are requiring more promotion or lower-margin categories would challenge the embedded operating-margin expansion thesis. A 5-8% post-print drawdown is plausible on an in-line quarter even without a fundamental break.

The more relevant competitive read-through is that Costco’s value proposition should remain resilient if consumer budgets tighten, potentially pressuring broadline discretionary retailers more than warehouse clubs. However, Walmart (WMT) has the clearest ability to compete through grocery scale, membership economics, and fulfillment density; sustained WMT share gains would limit Costco’s ability to monetize membership-fee and merchandise-margin initiatives. Suppliers may also become less willing to fund price gaps if tariffs, freight, or commodity costs reaccelerate, forcing COST to choose between gross-margin protection and maintaining its price-value spread.

Consensus is likely underweighting duration risk rather than questioning business quality. A high-quality defensive compounder can still de-rate if comparable-sales growth normalizes before margins visibly inflect; that is a 6-18 month risk, especially if rates remain restrictive and investors rotate toward lower-multiple staples. The bullish case is falsified near term by slowing renewal/traffic, gross-margin compression excluding accounting noise, or guidance that implies EPS growth cannot outpace the multiple’s compression; it is reinforced by sustained high-single-digit core comps plus demonstrable SG&A leverage.

Key Decisions for Investors

• Do not add outright COST risk ahead of September 24 unless positioning data shows a meaningful pre-print pullback; the implied reward to bullish estimates appears modest relative to downside from an in-line report. Reassess after results on renewal rate, traffic, and ex-fuel/FX gross-margin progression.
• For a 1-3 month valuation-neutral expression, consider long WMT / short COST in equal-dollar terms. WMT offers a more diversified grocery, advertising, marketplace, and fulfillment earnings mix, while COST carries greater multiple-duration risk; exit if COST demonstrates clear margin acceleration or if the relative spread moves 8-10% against the position.
• Use COST only as a post-earnings long if shares reset materially while core comparable sales remain high-single-digit and renewal metrics hold. The preferred entry is after a valuation-driven selloff rather than chasing a beat, with risk defined by a subsequent downward revision to membership, margin, or FY2027 EPS expectations.
• Monitor BJ / BJs Wholesale Club (BJ) as a lower-priced warehouse-club proxy rather than assuming COST’s strength transfers one-for-one. A widening COST-BJ valuation gap without evidence of divergent traffic or membership trends would create a potential relative-value opportunity.