Here's How Much Costco Stock Is Expected to Move After Earnings

Costco is expected to report fiscal Q4 revenue of a record $94.85 billion, up 10% year over year, and EPS of $6.52 versus $5.87 a year earlier, with comparable sales projected to rise 8.88%. Options imply a roughly 3% post-earnings move, placing shares between about $873 and $925 from Tuesday's close. Investors may focus on margins and membership growth, as Bank of America cut its price target to $1,095 from $1,200 over fuel costs and potential tariff-refund-funded price cuts, despite a consensus target of $1,048 implying 16% upside.

Analysis

COST’s setup is less about headline revenue growth than whether incremental sales are being purchased with margin giveback. If management channels tariff-related benefits into retail pricing, traffic and renewal elasticity may improve, but the near-term result is lower merchandise-margin conversion and less support for a premium multiple. That creates a difficult asymmetry: an in-line quarter can still de-rate the shares if gross margin, renewal rate, or membership fee income fails to offset price investment.

The second-order beneficiary of a more aggressive Costco price posture is WMT, which can point to Costco’s pricing as validation of its own value proposition while retaining greater advertising and marketplace-margin offsets. BJ is more exposed competitively: a broad Costco price reset in consumables would pressure BJ’s ability to recover margins, particularly if it responds with promotions. Conversely, evidence that Costco can hold gross margin while driving member additions would reinforce the structural moat and likely widen the valuation gap versus BJ rather than materially changing WMT’s thesis.

Near term, the options-implied move appears too small only if the earnings call changes the market’s view of margin durability; otherwise, the event is likely noise after a crowded premium-consumer narrative. Over the next 1-3 months, monthly sales releases, renewal trends, and any explicit tariff-refund pricing comments matter more than reported EPS. The bullish thesis is falsified by a sequential gross-margin decline not explained by fuel, slowing paid-member growth, or guidance indicating that price investment persists into multiple quarters; the bearish thesis is falsified if traffic accelerates without a corresponding merchandise-margin sacrifice.

Key Decisions for Investors

• Do not add directional COST exposure ahead of earnings solely on the implied move; wait for the call to establish whether price investment is temporary or a sustained margin headwind. Add long exposure only if management confirms stable ex-fuel gross margin and resilient renewal/member trends; target a 3-6 month recovery toward the Street target range, with a stop on a post-earnings break below the event low.
• For a defined-risk bearish expression, buy a 1-3 month COST put spread only if post-results commentary confirms tariff-related price cuts and gross-margin pressure. The trade is aimed at multiple compression from a premium valuation rather than a sales miss; exit if management frames the action as one-time and membership economics accelerate.
• Monitor a relative-value pair: long WMT / short BJ over the next quarter if Costco signals broad consumables price investment. WMT’s diversified profit pools should absorb category pricing better, while BJ faces more direct warehouse-club substitution risk; close the pair if BJ demonstrates stable merchandise margin and membership trends despite Costco’s actions.
• Set an alert for the first post-earnings monthly sales release: sustained traffic acceleration with stable margin would support re-entering COST long, while traffic growth failing to improve after price actions would make the margin tradeoff materially more negative.