COST vs MELI: How Costco Wholesale and MercadoLibre Compare (2026)
Short answer
COST (Costco Wholesale) and MELI (MercadoLibre) are often compared because they share investment themes, but they are different businesses. Costco Wholesale operates a membership-based warehouse club chain. MercadoLibre is the largest e-commerce and fintech company in Latin America. Neither is universally better: pick by which thesis you are expressing and what you already own. This is descriptive, not a recommendation.
What does Costco Wholesale (COST) do?
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.
What does MercadoLibre (MELI) do?
MercadoLibre is the largest e-commerce and fintech company in Latin America. The company operates across three main lines. Mercado Libre Marketplace is the dominant e-commerce platform in Latin America, present in 18 countries with the largest scale in Brazil, Mexico, and Argentina. Mercado Pago is the largest fintech platform in Latin America, originally built as a payments solution for the marketplace and now expanded into a full digital wallet, credit, and asset management offering. Mercado Envios provides logistics infrastructure for marketplace sellers.
COST vs MELI: how do they differ?
Both fit overlapping themes, but they are not interchangeable. Costco Wholesale is best understood through its own drivers, and MercadoLibre through its. The useful comparison is which set of drivers and risks you want exposure to.
- COST drivers: Membership fee growth; International expansion.
- MELI drivers: Brazil and Mexico growth; Mercado Pago expansion beyond marketplace.
COST or MELI: which should you pick?
The bottom line: COST vs MELI
COST and MELI 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 MELI exposure against your real portfolio. It is not an investment adviser.
Build a basket around COST with Walnut
Use Costco Wholesale as one constituent in a thematic basket Walnut's AI helps you assemble. Describe a thesis you believe in, the AI proposes the holdings and weights, and you approve before any broker order.
FAQ
What is the difference between COST and MELI?
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Costco Wholesale operates a membership-based warehouse club chain. MercadoLibre is the largest e-commerce and fintech company in Latin America. They show up together because they share investment themes, but they are different businesses, so the better fit depends on which thesis you are expressing.
Is COST or MELI the better stock?
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Walnut is informational, not investment advice. Neither is universally better; COST and MELI suit different views and risk levels. Compare what each does, how they make money, and the risks, then decide which fits your thesis and what you already own.
Should you own both COST and MELI?
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Because they share themes, owning both concentrates you in that theme. That can be intentional (a focused bet) or accidental (less diversification than it looks). Walnut can show your combined exposure across both before you add the second.
What are the risks of COST vs MELI?
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COST: Costco's premium valuation embeds high expectations for continued same-store sales growth and margin expansion. Any consumer slowdown or competitive pressure from BJ's, Sam's Club, or Amazon would compress the multiple. MELI: Currency volatility (especially Argentina) affects reported financials. Amazon's expansion in Mexico and Brazil intensifies competition. Regulatory changes in fintech (particularly around credit) can affect Mercado Pago.
Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell COST or MELI; figures are approximate and dated. Verify current data before investing.