COST vs PSMT: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

Reading it: PSMT is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. COST and PSMT share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined COST and PSMT exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Costco Wholesale operates a membership-based warehouse club chain. Members pay an annual fee (currently $65 for basic Gold Star, $130 for Executive) for access to Costco warehouses, where they can buy products at lower markups than traditional retailers. Costco operates approximately 900 warehouses globally, with the largest concentration in the United States plus meaningful presence in Canada, Mexico, the UK, Japan, South Korea, Taiwan, Australia, and other markets.

Full COST guide

PriceSmart, Inc. runs membership warehouse clubs modeled on the Costco format, but sized for smaller markets across Central America, the Caribbean, and South America. As of mid-2026 the company operated roughly 56 clubs in 12 countries plus one US territory, serving more than 3 million active cardholders. Clubs run from about 33,000 to 62,000 square feet, sell a curated mix of retail and wholesale merchandise (including a large private-label program), and charge an annual membership fee around $35. About 45% of business-to-business sales come from small businesses. The company is headquartered in San Diego and was founded by Sol and Robert Price, the same family behind the original Price Club that seeded Costco.

Full PSMT guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• COST drivers: Membership fee growth; International expansion.
• PSMT drivers: Club expansion runway; Recurring membership income.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: Costco's premium valuation embeds high expectations for continued same-store sales growth and margin expansion. For PSMT, priceSmart operates almost entirely in emerging Latin American and Caribbean markets, so revenue and earnings are exposed to local currency depreciation, inflation, and political or economic instability that can compress reported results in US dollars.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick COST if you believe its drivers more; PSMT if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the COST and PSMT guides.

COST. Costco trades at one of the highest P/E ratios in retail, reflecting the durable membership model, consistent same-store sales growth, and the long runway for international expansion. The premium is also driven by Costco being widely viewed as a quality compounder in retail. The valuation has compressed historically only during severe market drawdowns.

PSMT. PriceSmart's fiscal Q2 2026 revenue rose about 9.7% year over year to roughly $1.50 billion, continuing a run of high single to low double-digit growth. The stock trades at a premium multiple near 39x earnings, above some analyst fair-value estimates, reflecting expectations for continued club expansion and membership growth. Fiscal Q3 2026 results were scheduled for release in early July 2026.

Headline figures (approximate, early 2026): COST shows revenue (ttm) ~$260 billion, operating margin ~3.5% (low, by design; membership fees are the profit lever), net income (ttm) ~$7.5 billion, eps (ttm) ~$17.00; PSMT shows revenue (fy2025) ~$5.27B, revenue (q2 fy2026) ~$1.50B (up ~9.7% YoY), net income (fy2025) ~$147.9M, market cap ~$6B.

COST and PSMT are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined COST and PSMT exposure against your real portfolio. It is not an investment adviser.