Should You Buy Costco Stock Before March 5?

Costco reported solid recent operating metrics — revenue for the period ending Nov. 23, 2025 rose ~8.3% with comparable sales up 6.4%, and December comparable sales at 7% — and it beat expectations in its last quarterly report (Dec. 11, 2025). The shares have rallied ~16% year-to-date and trade near $1,000 (approaching an all-time high of $1,078), but the stock commands an elevated valuation (roughly a 54x P/E versus a 25x S&P 500 average), prompting caution ahead of March 5 earnings; the piece argues that despite operational strength, the rich valuation makes Costco a less attractive buy now.

Analysis

Market structure: Costco's strong comps (6%+ quarterly comp, Dec comps +7%) reinforce its defensive demand resilience, benefiting wholesalers, payment partners, and high-APR credit products tied to memberships. Losers: mid‑tier discretionary retailers that lack membership moats and thin gross margins. Elevated P/E 54 implies investors are pricing multi-year EPS acceleration (>15% CAGR); absent that, expect valuation-sensitive flows out of COST into cheaper staples (WMT, PG) and fixed income.

Risk assessment: Immediate risk is earnings-driven IV spike and a 5–10% gap either direction around March 5; short-term (weeks) valuation re-rating if same‑store growth decelerates below ~3%. Tail risks include sudden membership churn (macro shock), large capex or margin compression from freight/labor (+200–300bps SG&A), and regulatory scrutiny on pricing/membership practices over 12–36 months. Hidden dependency: gasoline and ancillary sales drive cash flow volatility and membership renewals, so inventory or fuel disruptions magnify EPS swings.

Trade implications: Avoid a fresh outright long pre-earnings; use defined‑risk option structures to express views. Tactical trades: small bearish put spreads into earnings, a relative-value long WMT/short COST pair to capture multiple contraction, and if price retraces >20% to ~800, scale into a long for multi-year moat exposure. Key catalysts: March 5 earnings, monthly sales updates, and Fed rate moves; treat a sustained 10bp rise in 10Y yield as a catalyst for multiple compression.

Contrarian angles: Consensus ignores that Costco's membership model can justify a premium, particularly if membership ARPU grows >4% annually; the premium looks overbaked only if top‑line growth stalls. Historical parallels (premium retail multiples persisting through secular track records) suggest a buy-on-weakness approach rather than aggressive shorting; but short-term option plays capture the most asymmetric upside from a mean reversion.

Key Decisions for Investors

• Do NOT initiate >2% portfolio long in COST ahead of March 5 earnings; instead allocate up to 0.5–1.0% to a defined‑risk bearish put spread: buy COST Mar 20 2026 925/850 put spread (or nearest strikes) to express downside to ~850 with capped loss; exit on close above 1,050 or on March 6.
• Establish a relative‑value pair trade: long WMT (2–3% position) funded by shorting COST (1–1.5%) to capture expected multiple compression; rebalance if COST falls >15% or WMT outperforms by 10% in 30 days.
• If COST retraces to <=800 within 6–12 months, accumulate up to 3% portfolio on tiered buys (50% at 800, 30% at 720, 20% at 600) as long‑term moat play; set stop‑loss at 540 (30% from 800) or reassess thesis.
• Monitor monthly sales releases and membership renewal data weekly; if sequential same‑store growth falls below 3% for two consecutive months or membership renewals decline >100bps YoY, increase hedges (buy-to-open additional put protection) within 10 trading days.