Mizuho reiterates Costco stock rating on strong March sales By Investing.com

Costco reported March adjusted U.S. comparable sales up 7.7% excluding gas (with ~150 bps Easter shift) and a sequential acceleration from 6.0% in February; March net sales rose 11.3% to $28.41B and first 31 weeks net sales were $173.26B (+9.1%). Gas business accelerated to a 25-30% pace with average price/gal +18% (implying double-digit volume gains); cannibalization eased to ~40 bps (lowest since mid-2025). Multiple firms responded favorably: Mizuho reiterated Outperform $1,065 PT, BofA reiterated Buy $1,185, Telsey raised PT to $1,135, Wells Fargo raised PT to $1,000 (Equal Weight), and Truist kept Hold $977; shares are up ~19.6% YTD and trading around $1,030.

Analysis

The key non-obvious lever is the fuel-to-merchandise feedback loop: higher fuel activity acts as a low-cost customer acquisition channel that can materially raise membership LTV even as reported gross margin faces dilution from a larger share of low-margin fuel. Treat fuel as a customer acquisition and retention expense line rather than a pure P&L driver; models that simply fold in fuel revenue share without reworking renewal, churn, and basket uplift understate long-run operating leverage.

Competitively, warehouse clubs with integrated fuel sites can extract rent-like economic benefits versus pure grocery players — suppliers and national brands may prefer a single-stop distribution through high-frequency warehouse shopper cohorts, tightening shelf-share for rivals and raising bargaining power for Costco over specialty discounters. Second-order winners include upstream fuel suppliers and regional trucking/logistics exposed to higher throughput at warehouse hubs; payment processors see uneven benefits depending on interchange mix between fuel and general merchandise spend.

Primary near-term risks are macro-pattern reversals (oil price collapse or a sudden drop in discretionary consumption) and valuation compression if the market stops awarding premium multiples for membership-driven revenue durability. Monitor membership renewal cadence and fuel margin mix as leading indicators: meaningful divergence there within 1–3 quarters will be the fastest path to re-rating, while policy or energy shocks can flip traffic patterns within weeks.

Key Decisions for Investors

• Buy COST shares sized 2–4% of portfolio with a protective collar for 6–12 months: buy 6m 10% OTM puts and sell 6m 20–25% OTM covered calls. Rationale: preserves upside from sticky membership/LTV tailwinds while capping downside from an abrupt macro or energy-price shock; expected reward: asymmetric upside if membership retention surprises, capped to the call strike — cost of protection financed by call premium.
• Bullish call-spread: buy a 9–12 month COST 7–15% OTM call spread (debit). Risk/reward: defined max loss = premium, target 2x–3x return if membership-driven comps and nonfuel cross-sell continue to outpace peers over the next 9–12 months. Enter on intraday weakness or immediately if implied vol cheapens relative to historical post-earnings levels.
• Pair trade (idiosyncratic hedge): long COST / short a generalist big-box retailer (e.g., WMT) sized 1:0.6 over a 6–12 month horizon. Rationale: isolates warehouse-club membership moat and fuel-driven traffic premium versus broad retail exposure; exit or trim if macro consumption weakens broadly or if same-store differentials compress for two consecutive quarters.
• Event-protection put spread into key catalysts (earnings, membership update): buy short-dated 5–10% OTM put spreads expiring within 30–45 days around the catalyst. Use as cheap downside insurance to protect long exposure from earnings disappointment or sudden oil-driven traffic drops; max loss limited to spread premium, preserves capital for buying on confirmed weakness.