Costco Stock Has Jumped In 2026. Is It Too Late to Buy?

Costco reported fiscal Q1 net sales up 8.2% year-over-year to $66.0 billion and adjusted comparable sales up 6.4% (ex-gas/FX), with membership fee income rising 14% (7.3% ex-fee increase and FX). Digitally enabled adjusted comparable sales showed strong growth—+20.5% in fiscal Q1 and +18.3% for the retail month of December—while December adjusted comparable sales were +6.2% year-over-year. Despite the resilient top-line and recurring membership income, the shares trade at rich multiples (trailing P/E ≈53, forward P/E ≈49), leading the author to flag limited margin for error and recommend waiting for a lower entry (target below $800).

Analysis

Market structure: Costco’s beat highlights winners — membership-driven retailers (COST, DLTR, WMT) and CPGs with strong private-label placement — while margin-sensitive mid-market grocers (some TGT categories, regional grocers) face pricing pressure. Digitally enabled comps +20.5% vs overall comps +6.4% indicates Amazon and Walmart are indirect competitors on convenience, but Costco’s membership model preserves recurring revenue and stickiness; suppliers face persistent price compression and higher volume concentration at big-box buyers.

Risk assessment: The valuation (TTM P/E ~53, forward ~49) creates little forgivable downside: a sustained slowdown in adjusted comparable sales to <3% YoY or membership income growth falling to ~2–3% ex-fee would likely trigger >15–25% multiple compression. Short-term (days–weeks) risks are sentiment-driven; medium-term (quarters) risks include labor/cost inflation and FX/gas volatility that distort comps; long-term tail risks include a meaningful shift to e-comm fulfillment costs or adverse regulation on membership practices.

Trade implications: Avoid initiating fresh large long positions in COST at current premiums; prefer defensive/relative-value trades. Tactically, buy 3–6 month put spreads 5–10% OTM on COST for 0.5–1.0% portfolio risk if you hold shares, or sell 2–3% OTM covered calls to monetize upside while trimming. Consider pair trades (long WMT or DLTR, short COST) sized 1–2% net to capture valuation reversion and margin resilience in lower-P/E peers.

Contrarian angle: Consensus underestimates two opposing possibilities — Costco’s digital acceleration could sustain a higher multiple if it converts online shoppers at scale, or any sequential slowdown will be punished more severely than peers because of the stretched multiple. Historical parallel: high-quality retailers have seen 20–40% de-rating after one bad comp cycle; hedge for that outcome while being ready to add on a pullback below ~$800 as the author’s preferred entry.

Key Decisions for Investors

• If uninsured long COST, reduce position to 1–2% of equity risk within 2 weeks and allocate proceeds to cheaper defensive retail: initiate 1–2% long WMT and 0.5–1% long DLTR (lower P/E, similar consumer exposure).
• Establish a hedge: buy 3–6 month COST put spreads at strikes ~5–10% OTM (size to cap cost at 0.5–1.0% portfolio risk) to protect against a >15% downside re-rating; roll/close on the next quarterly results if comps remain >5% YoY.
• Enter a relative-value pair: long WMT (1.5% position) vs short COST (1.0% position) over 3–9 months to capture potential multiple contraction; rebalance if Costco comps stay >6% for two consecutive quarters.
• Only consider new outright long in COST if price falls below $800 (target entry), or if forward P/E compresses to <35 with comps >4% YoY — then scale 1–3% positions and add incrementally on confirmation over two quarters.