Why Costco Will Win this Holiday Season and in 2026

Costco is leaning into its Kirkland Signature private label and expanding assortments (over 30 new Kirkland products in Q4 2025) while reporting resilient demand: net sales rose ~8% year-over-year and fiscal 2025 e-commerce grew 15.6%, reaching nearly $20 billion, with a 90% membership retention rate. Management highlights Kirkland items typically deliver 15–20% value versus national brands, and the company has filed suit seeking tariff refunds (decision expected early 2026); the next quarterly report is due Dec. 11.

Analysis

Market structure: Costco (COST) is the direct beneficiary — Kirkland expansion and ~15% FY e‑commerce growth (now ~$20bn) should shift share from national brands and discount competitors by offering 15–20% lower price points. Sam’s Club/WMT and TGT are the logical losers in household staples and bulk grocery if Costco converts price‑sensitive shoppers; Sam’s Club’s physical footprint advantage may blunt share shifts but not margin. Private‑label scale reduces tariff pass‑through and gives Costco incremental pricing power; expect a modest gross‑margin tailwind over 12–24 months if roll‑out continues. Cross‑asset: stronger COST can tighten IG spreads modestly and raise short‑dated equity vols around Dec 11 earnings and the early‑2026 tariff litigation decision; commodity exposure is concentrated in specific SKUs (mattresses, tires) not broad energy markets.

Risk assessment: Tail risks include a member‑retention shock (>5% drop), an adverse tariff/court ruling (early 2026) that forces cost pass‑through, or reputational/legal losses from design‑copy suits — each could cut operating margins >100–200bps. Immediate risks (days): earnings volatility around Dec 11 and holiday sales cadence; short term (weeks–months): membership signups and e‑commerce holiday conversion rates; long term (quarters–years): store additions and Kirkland margin contribution. Hidden dependencies: reliance on third‑party contract manufacturers for Kirkland SKUs (supply concentration) and potential retaliation by national brands via exclusive distribution. Key catalysts: Dec 11 quarter, Thanksgiving/holiday sales cadence, and court decision expected early 2026.

Trade implications: Direct play — establish a 2–3% long position in COST sized to portfolio risk, layering 1% pre‑earnings and add to 2–3% on confirmation of membership growth or e‑commerce ≥12% YoY; hedge with 0.5% cost of ATM puts across earnings. Pair trade — long COST 2% vs short WMT 1–1.5% (or TGT 1%) to express relative margin/retention divergence over 3–9 months. Options — deploy a defined‑risk bullish calendar or debit call spread (buy Jan 2026 10–15% OTM calls, sell nearer‑term calls) sized 0.5–1% to capture upside while limiting premium; consider selling covered calls on >8% rally.

Contrarian angles: Consensus underestimates upside from e‑commerce scale — a sustained 15% e‑comm CAGR adds ~+$3bn revenue/year (implying ~1–2% EPS upside over two years) which is likely underpriced. Conversely the market may be complacent on legal/tariff tail risk; an adverse ruling early 2026 could force a meaningful hit to COGS and valuations. Historical parallels: private‑label scale (e.g., Target’s Good & Gather) improved margins but provoked supplier pushback and litigation — expect second‑order effects like supplier exclusivity and SKU delisting risks. Risk/reward is asymmetric for controlled long exposure with hedges; avoid unhedged large positions until post‑earnings and court clarity.

Key Decisions for Investors

• Establish a 2–3% long position in COST (ticker: COST) sized to portfolio risk: initiate 1% ahead of Dec 11 earnings and add to reach 2–3% if membership growth and e‑commerce metrics meet or exceed management guidance (membership retention ≈90% maintained; e‑comm growth ≥12% YoY).
• Hedge earnings/tail risk: buy 0.5% notional of ATM puts expiring 30–45 days post‑earnings (or construct a collar if holding >2% position) to cap downside from an earnings miss or holiday softness; size protection to limit drawdown to ~3–5% of portfolio value on the COST leg.
• Relative value pair: go long COST 2% and short WMT 1–1.5% (or TGT 1%) to capture expected 4–8% relative outperformance over 3–9 months driven by private‑label margin resilience and membership recurrence. Rebalance if relative spread tightens/widens >150bps.
• Options leverage (bullish, defined risk): deploy a Jan‑2026 debit call spread ~10–15% OTM on COST sized 0.5–1% of capital to capture upside from sustained holiday momentum; if COST rallies >8% post‑earnings, sell short‑dated calls to monetize gains.
• Catalyst‑trigger rule: set an actionable alert for the early‑2026 tariff litigation decision — if ruling is favorable to Costco (partial/full refund or dismissal), increase COST exposure by +1–2%; if adverse, reduce exposure by 50% and widen hedges immediately.