Is 2027's Opportunity Hiding in Latin America? Nubank and MercadoLibre Under the Lens

Some companies have stock prices that go nowhere for years while the business quietly compounds; traders call that being stuck in the mud. Nubank and MercadoLibre are exactly that kind of pair. One is Latin America's largest digital bank, the other the continent's e-commerce and payments giant. Both shares spun their wheels for a long stretch while customers and revenue multiplied underneath. That is why the whole 2027-opportunity debate converges on these two names, and I rolled up my sleeves to untangle it.

A stuck price, a working engine

Hearing someone who worked inside both companies teaches more than reading balance sheets from the outside. The guest did investor relations at each of them, so he has seen both the kitchen and the dining room. The cultural contrast he describes is striking: MercadoLibre runs on written principles like creating value for users, living in permanent beta and taking risks like owners, with performance reviews tied to those principles. Nubank is built around loving customers fanatically, staying hungry and challenging the status quo. Both are founder-led and both kept their values intact while scaling. Like a good neighborhood bakery, the recipe survived every new branch.

In Brazil the ballot box sent the stock market flying in a single day. On Monday October 5, 2026 the benchmark index leapt 7.7 percent past 206,000 points for its highest close in history. Figures compiled by Rio Times (riotimesonline.com) show it was the sharpest one-day climb since March 2020. The cause was a first-round shock: the right-wing candidate finished ahead on 47 percent, wrong-footing the polls, with the incumbent president around 45 percent. The runoff lands on October 25, and until then Brazilian shares will rise and fall with the polling averages.

The market cheer after the vote

The logic of the celebration was simple: the candidate promising fiscal restraint got priced as a tighter hand on the public purse. Coverage from Globo's business desk shows bank and retail shares leading the rally; some bank stocks gained over 10 percent in a day, the exchange operator's own shares jumped more than 20 percent, and a famous retailer soared 24 percent. The Brazilian real strengthened about 4 percent against the dollar. Exporters stood on the other side of the coin: a stronger currency trims the profits of firms that earn in dollars and spend in reais, so mining and pulp shares slipped. The ballot box did not hand everyone the same gift.

So why Latin America, and why now? Picture a street market: stalls full, crowds thick, but one endless line at the only cash register. Hundreds of millions of people on the continent either never met a bank or dislike the one they have. A young population lives on its phone, small merchants hunger for credit, and bureaucracy moves slowly. Whoever fills that gap becomes the stall that opened first; once shoppers form the habit, they rarely leave. Market commentary carried by Reuters points the same way: investors reward policies that fit the region's economic and fiscal needs. Risks are real, of course, but so is the prize.

Now the first file under the magnifier: Nubank. The company's own statement, published through nu.com, shows 139 million total customers in the second quarter of 2026, with 118 million in Brazil, 16 million in Mexico and over 5 million in Colombia. Roughly 4 million new customers arrived in three months. The monthly activity rate passed 83 percent, and in Brazil it crossed 86 percent for the first time. Nearly every adult Brazilian has now met this purple card. To my eyes the battle for customers is largely won.

The purple bank's moats

As impressive as the headcount is how much money each customer leaves behind. Quarterly revenue climbed 39 percent from a year earlier to 5.9 billion dollars; net income passed 1 billion dollars for the first time in company history and return on equity touched 33 percent. The credit portfolio reached 39 billion dollars and deposits 45 billion. The cost side looks like a technology firm: serving one customer costs about a dollar a month. While traditional banks pay for branches and teller lines, Nubank pays for servers, and the difference drops straight to profit.

The moat in Brazil is the seat of the customer's main bank. The firm already dominates the mass market and is the first address where large numbers of customers receive their salary and pay their bills. It climbs upmarket with two brands: Ultravioleta for affluent clients and the newly launched Croma for the core segment above that. It also touches more small businesses than any other financial institution in the country. Like an octopus, arms in every pocket, one head in the middle. A rival would have to rip out habits, not just an app, to dislodge it.

Credit works here like a superpower. Customers who treat Nubank as their primary bank default at roughly half the portfolio average. Affection and collection walk hand in hand: the more a customer loves the bank, the more regularly they pay. Underwriting models outperform peers in every income band. My lesson is plain: in banking the sturdiest collateral is neither mortgage nor guarantor but the customer's salary landing in your account. The bank that owns that bond rides out crises cheaper than rivals.

Mexico is act two of the story. After securing a banking license in August the firm became the country's largest digital bank, passing 16 million customers and reaching 16 percent of the adult population. What fascinates me is monetization speed: revenue per user in Mexico runs at more than twice the level Brazil showed at the same stage. The central bank's instant-transfer rules and new payment standards add a tailwind. In short, Mexico looks like Brazil in 2020; the film played once, and now it runs a second showing.

The plan to head north into the United States is a more cautious tale. Management advances with small steps and guardrails instead of spending boldly across the ocean. I think that is right, like a novice swimmer practicing first in the shallow end. The American market is saturated, rivalry is fierce and acquiring customers costs a fortune. Lessons learned in Latin America may travel north, but that front will take years to decide anything. So I treat the American move as a sweet option, not as part of the core thesis.

MercadoLibre's growth engine

The second file: MercadoLibre. The operating report carried by Businesswire shows 10.2 billion dollars in revenue for Q2 2026, up 50 percent, the fastest pace in four years and the 30th straight quarter above 30 percent growth. Gross merchandise volume hit 22 billion dollars, with Brazil up 39 percent stripping out currency effects. The share price stayed under pressure for a while despite that table, because the market read the margin lines, not the growth headline.

The margin story is this: the operating margin slid from 12 percent a year earlier to 6.7 percent. The reason is no secret; the company poured more than 2 billion dollars into its credit book in three months. Net income of 466 million dollars beat expectations, as Reuters reported, yet it meant a third straight quarter of profit pressure. The earnings-call record mirrored on StockTitan lays the philosophy bare: polish market share and credit growth rather than near-term profit. Like a farmer burying seed instead of eating it; harvest later, patience now.

The payments arm Mercado Pago looks like a company of its own. Monthly active users hover near 80 million and the total credit portfolio grew 75 percent in a year past 16 billion dollars. The credit-card book nearly doubled, with 2.6 million cards issued in a single quarter. Argentina offers a textbook case: the guest tells how the brand name turned into a verb in daily speech, with people in supermarket lines offering to pay each other by that name. Once a payment tool enters a people's language, it stops being a product and becomes a habit, and habits are far harder to destroy than products.

On the competitive front stand two giants: Amazon and Sea's Shopee. Both attack with logistics and price weapons. But MercadoLibre's answer is ready: a distribution network woven over years, a seller ecosystem and a closed loop fused with payments. Advertising revenue opened an extra front. The habit of taking risks like owners, one of management's cultural principles, pays off here; when a rival moves, the reply reaches the field within weeks. My read: this war will be won not by the cheapest player but by the one closest to the customer.

Should you hold both?

Then the portfolio question: should an investor hold both shares? One investor on the show is blunt: carrying both would duplicate the same bet, since each company rides Latin America's digitalization. He holds MercadoLibre and watches Nubank from the sidelines. I understand the logic; like backing two bakeries on the same street, the risk sits on one road even if both win. My own approach differs slightly: when the theme is cheap and the two firms play it with different muscles, holding both in tuned doses is defensible. Not blind equal weight, though; one is commerce, the other a bank, and their balance sheets react to different shocks.

The risks belong on the table too, because the story does not run one way. First politics: should runoff polls flip, the market cheer turns into selling. Second credit quality: both firms grow their loan books fast, and a jump in unemployment would sting through delinquencies. Third currency: a strong dollar squeezes dollar-reported balance sheets. Fourth valuation: good stories rarely come cheap, expectations sit like a high bar, and missing them hurts. So build the position in stages, not overnight, and re-test the thesis every earnings season.

A closing watchlist for 2027. First, Brazil after the runoff: will fiscal-discipline talk turn into action? Second, Nubank's revenue per user: as customer counts near their ceiling, that line becomes the engine of the story. Third, MercadoLibre's loan-book quality: collections deserve as much talk as growth. If these three signals flash green, prices that spun in the mud waking up would surprise no one. I will lean back and track those three gauges; opportunity comes to the patient.