Why Costco Stock May Struggle Even as Its Business Thrives

Costco faces a mixed setup heading into its Dec. 11 earnings: fiscal Q4 results (reported Sept. 25) showed EPS $5.87 and record revenue of $86 billion with 5.7% same-store comps (8.6% international), membership income up 14% and global renewal rates at 89.8% after a September price increase. Offsetting these strengths are valuation and margin risks — the stock trades around 49x forward earnings and 14x book with merchandise gross margins near 11% and operating margin below 4% — and technical weakness (50-day < 200-day SMA, a wedge pattern, declining OBV and RSI above oversold). Recent digital sales showed volatility (Q3 digital comps 13.6% then Sept 26.1% and Oct 16.6%); given a 10% three-month share decline and the stretched valuation, the piece suggests cautious positioning with potential for further downside absent clear improvement in traffic or margins.

Analysis

Market structure: The near-term winners are large, omnichannel grocers/wholesalers like WMT and AMZN (scale to absorb margin shocks) and suppliers with pricing power; losers are thin-margin specialty SKUs and small-format competitors who can’t absorb rising logistics/tariff costs. Costco’s membership cash-flow is a durable moat but equity requires flawless execution — at 49x forward EPS and ~14x TBV any miss compresses multiples quickly, shifting share toward deep-discount players. Cross-asset: weaker COST equity flows would modestly widen retail credit spreads and lift short-dated equity put prices; stronger margin pressure implies higher grocery/energy commodity passthrough and USD resilience vs. CAD (warehouse/import flows).

Risk assessment: Tail risks include a tariff shock raising COGS 200–500bps, a consumer-income shock that reduces non-essential basket spend 3–5% QoQ, or a surprise membership churn >5ppt; each would materially hit sub-4% operating margins. In days–weeks, watch monthly comps and RSI/OBV momentum; in 1–3 months, Q1 trading and CPI prints will drive revisions; in 6–24 months, e-commerce scale and international comps determine re-rating. Hidden dependencies: membership renewals (threshold ~88% U.S./Canada) and digital fulfillment cost per order (if >2x store FOB, margins erode). Catalysts: Dec 11 earnings, weekly/monthly sales prints, tariff announcements, and two CPI prints in next 60 days.

Trade implications: Tactical short bias on COST is warranted into Dec 11 if monthly comps decelerate or OBV keeps trending down; prefer defined-risk put spreads 45–90 days, 10–20% OTM, size 1–2% portfolio, target 15–30% downside. Relative-value: pair long WMT (overweight 2–3% portfolio) vs short COST (1–2%) to capture share shift and lower valuation risk. For protection, buy 30–60 day put spreads on a retail basket (COST/MCD/PEP) ahead of CPI and earnings.

Contrarian angle: Consensus underestimates membership elasticity and digital inflection — sustained digital comps >15% for two consecutive months plus renewal >90% would likely force a rapid re-rate, making current weakness a buying opportunity. The market may be over-discounting haircut risk: historically (post-2014–2016 retail corrections) Costco recovered within 6–12 months once comps and membership stabilized. Unintended consequence of short crowding is a sharp squeeze after one clean beat; cap positions accordingly and set stop-losses tied to technical breakouts (50-day back above 200-day SMA).

Key Decisions for Investors

• Establish a defined-risk bearish position on COST: buy 45–90 day put spreads 10–20% OTM sized to 1–2% of portfolio ahead of Dec 11 earnings; close at 15–30% downside or if COST prints membership renewal ≥90% and two-month digital comps >15%.
• Implement a pair trade: overweight WMT by 2–3% of portfolio and short COST by 1–2% (net exposure +1–2% to WMT) to capture relative share gains and valuation differential; reassess after Jan CPI and Costco monthly sales for December.
• If COST drops >20% from current levels, scale into a long core position (1–2% portfolio) via Jan 2027 LEAP or 18–24 month 10–25% OTM call spreads to play membership resilience and e-commerce upside, conditional on renewal rate staying ≥88% and sequential digital comps improvement.
• Hedge consumer cyclicality: buy 30–60 day put spreads on a retail/consumer basket (COST, MCD, PEP) sized to 1% portfolio before next two CPI prints and any tariff announcements; unwind after volatility normalized or CPI surprises to the downside.