Data Nubank: Nubank Leads as Brazilians' Primary Financial Institution and Has Already Banked 31.5 Million People

Nubank led primary institution usage across Brazil in Q4 2025, with ~30% of the population choosing it in 17 states, according to NPS Prism by Bain & Company. The report suggests millions of Brazilians rely on Nubank for salary, payments, and financial products. Overall, this is supportive demand/market-share momentum, but it’s research-based and unlikely to move markets materially.

Analysis

This is more important for Nubank’s funding and monetization model than for simple customer-count optics. If a growing share of users route salary and payments through NU, the business gets a cheaper, stickier deposit base and better visibility into cash flows, which should support faster unsecured lending, higher take rates, and lower churn over the next 2-4 quarters. That matters because the market tends to underwrite NU as a growth story; the more it behaves like a primary bank, the more it deserves a duration premium versus local incumbents.

The second-order losers are the incumbent Brazilian banks, especially the retail franchises with the weakest digital engagement and highest branch overhead. If NU keeps taking primary-wallet share, the pressure is not just on deposit gathering but on fee income, payroll capture, and cross-sell economics, which can force incumbents into higher deposit rates or pricier customer acquisition. Payment processors and card networks could also see mix shift if more of the spend/settlement loop stays inside NU’s ecosystem.

The main risk is that this is a survey-led signal, not yet a hard P&L datapoint. The thesis only becomes investable if it shows up in deposit growth, funding cost compression, and stable credit performance; otherwise the stock can re-rate on narrative and then mean-revert if loan losses or competition intensify. Over 6-18 months, the key falsifier is any sign that share gains are coming from promo-led, low-quality customers rather than durable primary relationships.

Key Decisions for Investors

• Long NU vs short ITUB or BBD in a 3-6 month pair trade: express the view that wallet-share gains are more valuable than legacy scale; target ~15-20% relative upside if NU shows deposit growth and stable delinquency trends.
• Add NU on weakness ahead of earnings only if upcoming filings confirm deposit mix improvement and funding-cost compression; otherwise treat this as a watch item, not a high-conviction buy.
• Short a Brazil bank basket hedge via ITUB/BBDC if evidence emerges that payroll capture is shifting away from incumbents; risk is a re-pricing of bank NIMs if rates fall faster than expected.
• Set a catalyst alert for NU quarterly metrics: primary-account conversion, deposit growth, and net charge-offs. If loan losses tick up before monetization catches through, the stock can de-rate sharply despite strong engagement.