Should You Buy Costco Stock for the Long Haul? Here's the Honest Answer.

Costco reported $207 billion in revenue over the first nine months of fiscal 2026, up 10% year over year, and net income rose 13% to about $6.2 billion. Even with solid growth, the article argues the stock’s roughly 49x P/E and elevated PEG make it too expensive, especially after flat performance since the start of 2025. The piece recommends investors keep Costco on a watch list unless the valuation falls materially, potentially below 35x earnings in a downturn.

Analysis

The market is effectively telling us Costco has become a quality bond proxy with retail optionality, and that is the core tension: at this valuation, the stock is now dominated by multiple compression risk rather than operating upside. The second-order issue is that any modest slowdown in traffic, basket mix, or membership renewal growth can produce outsized downside because the earnings path is already fully capitalized. In other words, the business can remain excellent and the stock can still underperform for a long stretch.

Relative value is more interesting than the single-name call. WMT and AMZN are the cleaner ways to express resilient consumer demand because they have broader monetization levers: Walmart has room to harvest price perception, logistics, and healthcare/services adjacency; Amazon has higher growth optionality and a less stretched earnings multiple. COST’s premium is vulnerable if investors rotate back toward names where incremental growth is not being paid for at nearly 50x earnings.

The catalyst set is asymmetric to the downside over the next 1-3 quarters. A risk-off tape, a consumer slowdown, or even a mild miss on membership/renewal commentary could force de-rating quickly because the stock’s flat year-to-date performance has already removed momentum support. The contrarian view is that COST is not expensive versus “best-in-class” quality in a vacuum; it is expensive versus its own growth rate and the opportunity cost of owning lower-multiple retail with better optionality.

For tactical positioning, this looks better as a relative short than an outright short because fundamentals remain strong and outright timing is poor. A pair trade against WMT or AMZN captures valuation normalization while reducing exposure to broad consumer weakness. If the market sells off, COST could overshoot to the downside, but absent a macro break, the more probable path is dead money with multiple bleed.

Key Decisions for Investors

• Short COST / long WMT as a 3-6 month valuation normalization pair: COST has much more multiple downside if retail sentiment stays constructive, while WMT offers similar defensiveness with less de-rating risk.
• Alternative pair: short COST / long AMZN for a higher-beta consumer-quality expression over 6-9 months; if rates drift lower or growth leadership returns, AMZN should rerate faster than a fully priced defensive compounder.
• Avoid initiating new long COST exposure until the stock de-rates into a meaningful dislocation; target entry only on a 15-20% drawdown or if forward earnings estimates step up enough to compress the multiple materially.
• For holders, consider replacing some COST exposure with a call spread funded by selling upside farther out-of-the-money; this preserves upside participation while monetizing the rich implied valuation.
• If COST breaks below its recent range on weak same-store or membership commentary, add to the relative short for a 1-2 quarter trade; if it holds up despite a risk-off tape, cover quickly because the stock’s downside can be abrupt but usually needs a catalyst.