MercadoLibre is three businesses operating under one roof, each reinforcing the others. The ecosystem effect is the whole story.

Mercado Libre (Marketplace). 218 million registered users across 18 countries. The dominant e-commerce platform in Latin America, with particular strength in Brazil (55% of revenue), Mexico, and Argentina. GMV grew 37% YoY in Q4 2025 to $19.9B.

Mercado Pago (Fintech). 78 million active users, $18.8B in AUM, a full-service digital bank operating without a single physical branch. MELI is now the largest private financial institution in Brazil by customer count. The credit book reached $12.5B, growing 90% YoY. Mercado Pago is not a payments add-on. It is a bank that happens to run inside a marketplace.

Mercado Envios (Logistics). Handles 95% of MELI's own packages. Delivers roughly three times faster than competitors in São Paulo. Operating leverage here is significant: every incremental package ships on infrastructure that already exists. The fulfilment network is a moat that took years and billions of dollars to build and cannot be replicated quickly.

The flywheel is what makes this business hard to kill. Better logistics drives more sellers. More sellers drives more buyers. More buyers drives more payment users. More payment users drives more credit and financial product adoption. More financial data drives better credit underwriting. Better underwriting drives more lending. More lending funds more purchases. The loop compounds on itself.

MercadoLibre has sustained above-30% revenue growth for seven consecutive years. The FY2025 result of $28.9B (+39%) was the third consecutive year of accelerating absolute dollar growth, even as the percentage rate naturally moderates at scale.

The margin compression in Q4 2025 (10.1% operating margin, down from 13.5%) is the most cited bear argument. It is worth examining carefully. MELI cut free-shipping thresholds in response to Shopee's push into Brazil. That is a defensive investment in market position, not evidence of structural deterioration. The same pattern played out in 2019 and 2022: margin compressed, recovered, then expanded to new highs.

Mercado Ads grew 67% YoY in Q4 2025 and is barely included in analyst models. At scale, advertising on a platform with 218 million users and full transaction data is one of the highest-margin businesses that can be built. This is the same trajectory that Amazon Advertising followed, and it is not yet in the price.

Mercado Pago is the part of MELI that most investors undervalue. It is no longer a payments feature. It is a fully-licensed digital bank with 78 million monthly active users, $18.8B in AUM, and a credit book that grew 90% YoY to $12.5B.

The credit book's NPL rate declining from 5.6% to 4.4% while the book grew 90% is the signal most models miss. The underwriting is improving as the data set compounds. Every transaction on the platform, what someone buys, when, at what price, in what category, feeds the credit model. Traditional banks do not have this data. MELI does, and it is getting better every day.

Brazil's formal financial system still excludes tens of millions of adults. Mercado Pago is not competing with Bradesco for sophisticated clients. It is serving people who had no access at all. The total addressable market is not a share-gain game. It is a creation-of-market game. Those are the best businesses to own.

MELI at 2.9x trailing sales is not a valuation that reflects a business growing revenue at 39% with 218 million users and a fintech franchise that would be independently valued at tens of billions of dollars.

MELI trades at a discount to Amazon on P/S multiples despite growing revenue 3.5x faster. It trades at a fraction of Shopify, which operates in a less dynamic geography with lower structural growth. The discount exists because of geography, Latin America, not because of the quality of the business.

Geography-based discounts are exactly where independent research finds edge. Institutional EM mandates are structurally underweight LatAm. Coverage is thin. The narrative gets dominated by macro noise, BRL moves, Argentina headlines, Brazilian election cycles, rather than by what the underlying business is actually doing. That creates a persistent mispricing for patient capital.

New CEO Ariel Szarfsztejn took over on January 1, 2026. The transition represents a modest near-term uncertainty, and a potential catalyst if he re-rates the investment case with the investor community.

Price targets are derived from a P/S framework applied to estimated FY2027 revenue, discounted back at an 11.5% cost of equity (reflecting LatAm risk premium). All three scenarios assume MELI retains its dominant market position.

The base case assumes MELI sustains ~30% revenue growth through FY2027 (decelerating from current pace), operating margins recover toward 13%, and the market re-rates the stock toward a multiple consistent with its growth profile. That is not an aggressive assumption. It is a reversion to what this business has always been.

The bear case requires Shopee to successfully and permanently take market share in Brazil while credit quality deteriorates in a macro shock simultaneously. Both conditions need to be true at once. That is possible, but not the base case.

• Shopee, The Competitor That Has Done This Before

  This is the risk that deserves the most serious treatment, because Shopee has a proven playbook and a parent company, Sea Limited, with the capital and patience to execute it over years.

  Shopee's method is well-documented from Southeast Asia: enter a market offering zero shipping fees, aggressive seller subsidies, and consumer vouchers funded entirely from Sea's balance sheet. In Indonesia, Thailand, Vietnam, and the Philippines, this strategy displaced Lazada, a more established incumbent, within three to four years. Lazada had brand equity, logistics infrastructure, and a head start. None of it was sufficient. Shopee out-spent it into irrelevance.

  Brazil is now the target. Shopee entered in 2021 and has been methodically building seller supply and consumer habit. Its Brazilian app consistently ranks in the top five shopping apps by downloads. Free shipping on virtually every order is the entry offer. Below-cost pricing on high-frequency categories (electronics, fashion basics, household goods) is the hook. The aim is to convert the price-sensitive segment of MELI's user base first, then work up the value chain.

  MELI's response, cutting its own free-shipping thresholds and absorbing the margin hit, is the correct defensive move, and it is exactly what the Q4 2025 margin compression reflects. The question is whether it is sufficient. Two data points matter more than any analyst estimate: (1) Brazil GMV share by seller cohort, are new sellers listing on MELI, Shopee, or both? (2) High-value buyer repeat purchase rates on MELI versus prior quarters. If high-value cohorts are holding, MELI wins the attrition war. If they are softening, the thesis needs to be reassessed.

  MELI has two structural advantages Lazada never had: a full financial services layer (Shopee has ShopeePay, but it is not a bank) and a logistics network that delivers three times faster in São Paulo. Speed and credit access are harder to subsidise away than price. But this is a risk we monitor every quarter, not one we dismiss.

  JPMorgan downgraded to Neutral in March 2026 on this risk. BTIG maintained Buy at $2,400. We monitor but do not yet see evidence of high-value buyer defection.

• BRL/USD Currency Drag Brazil accounts for approximately 55% of total revenue. A sustained BRL depreciation reduces USD-denominated results regardless of operational performance. This is a structural risk for all LatAm-exposed businesses, not specific to MELI, but it is real and worth sizing the position accordingly.
• Agentic AI, When the Browser Shops for You

  This risk is structural, slow-moving, and almost entirely absent from sell-side models. It deserves serious attention precisely because it is not yet priced by anyone.

  The mechanism is straightforward. AI shopping agents, embedded in ChatGPT, Perplexity, Google's AI Overviews, and dozens of emerging tools, now compare prices across the entire internet before a user opens any app. The user types "I need running shoes under $80" and the agent returns the three cheapest options from across the web, ranked by price, shipping time, and reviews. The user never opens MELI. The user never sees MELI's ads, or MELI's recommended products, or MELI's curated homepage. The discovery layer, historically where marketplaces make their margin, is being disintermediated.

  The data is already moving. AI-referred retail traffic grew 800% year-over-year on Black Friday 2025. McKinsey projects $3–5 trillion in redirected global retail spend by 2030 as agentic shopping scales. Google's own internal estimates suggest that AI Overviews are reducing click-through rates to e-commerce sites by 20–30% for price-sensitive queries. The users most likely to use these tools are also the users most likely to switch platforms for a better price, exactly the segment Shopee is also targeting.

  For MELI specifically, the threat runs in two directions. First, marketplace GMV growth could slow as users discover third-party sellers (including MELI's own sellers) via AI rather than via MELI's platform, bypassing MELI's take rate. Second, Mercado Ads revenue, which grew 67% in Q4 2025 and is not yet in most models, could face headwinds if AI agents reduce time spent on the MELI platform, shrinking the ad inventory that drives that revenue.

  There is a partial offset worth noting. Marketplace retailers, which includes MELI's sellers, appear in AI shopping results 24% more often than single-vendor DTC sites, per Adobe Analytics. The aggregation of supply on a marketplace is actually an advantage in an AI-indexed world, because the agent finds what it needs more efficiently on a platform with millions of SKUs than by crawling individual brand sites.

  But the net effect is unclear and the speed of adoption is uncertain. This is a risk we take seriously enough to hold a disciplined position size, conviction long does not mean uncapped. The most important metric to watch: Mercado Ads revenue growth rate as a proxy for platform engagement. Deceleration here before GMV decelerates would be an early warning signal.

• Credit Book at 90% YoY Growth A $12.5B credit book growing at 90% YoY is fine in a benign macro environment. It becomes a problem in a regional recession. NPL at 4.4% is currently improving, which is reassuring. But credit cycles turn, and MELI's book skews toward thin-file borrowers in emerging markets. This is the risk that would take longest to detect and longest to recover from.
• New CEO Execution Ariel Szarfsztejn took over January 1, 2026. He is an insider with deep institutional knowledge of the business. This is not a high-risk transition, but any new leadership adds a layer of uncertainty for at least the first two earnings cycles.