- Strategic Liquidity: Berkshire Hathaway completed its exit from Nu Holdings in early 2025, realizing an estimated $250 million total gain despite Nubank’s 47% YoY profit surge.
- AI Underwriting Edge: Nubank’s proprietary credit scoring models continue to deliver superior Net Interest Margins (NIM) compared to traditional peers like Citigroup and Bank of America.
- Regulatory Divergence: While US banks face tightening restrictions, Nubank is capitalizing on Brazil’s mature “Open Finance” ecosystem and an expanded digital asset treasury.
When the world’s most famous value investor walks away from a high-growth fintech powerhouse, the market usually braces for a correction. Yet, as we move through August 2026, the narrative surrounding Warren Buffett’s complete exit from Nu Holdings (Nubank) has shifted from a warning sign to a case study in divergent investment philosophies. While Berkshire Hathaway opted for the safety of short-term yields, Nubank has spent the last year proving that its “digital-first” moat is deeper than traditional metrics suggested.
The $250 Million Exit: Deconstructing the Timeline
Berkshire Hathaway’s departure from the Latin American neobank was not an impulsive reaction to a single earnings report, but a calculated, multi-quarter liquidation. Disclosure filings confirmed that the final tranche of 40.2 million shares was offloaded in Q1 2025 at an average price of $11.83. This followed larger tranches sold throughout late 2024 at prices ranging from $13.22 to $13.46.
The total realized gain of approximately $250 million marks a successful, if conservative, venture for Buffett. However, the exit coincided with a broader pivot. During the same period, Berkshire significantly reduced its exposure to the traditional financial sector, liquidating positions in Citigroup and trimming Bank of America. By the time the liquidation was complete, Berkshire’s strategy favored the stability of U.S. Treasuries over the high-velocity growth of emerging market fintech.
Comparison: Berkshire’s Exit vs. Nubank’s 2026 Vitality
Despite the “Oracle of Omaha” selling his stake, Nubank’s fundamentals have continued to accelerate. In 2026, the bank has leveraged its proprietary tech moat to maintain customer acquisition costs that are nearly 80% lower than legacy Brazilian incumbents.
AI-Driven Underwriting: The Secret to Nu’s NIM
A primary driver of Nubank’s success in late 2025 and 2026 has been its aggressive integration of generative AI for credit underwriting. Unlike traditional banks that rely on static credit bureau data, Nu Holdings utilizes high-frequency transactional data to predict default risks in real-time. This has allowed the bank to report a net income of $557.2 million in early 2025—a trend that has only strengthened as the platform scales across Mexico and Colombia.
According to the official investor relations report, the bank’s ability to price risk accurately in volatile emerging markets has resulted in a Net Interest Margin (NIM) that consistently outperforms US-based institutions. This technological superiority explains why the stock has remained resilient even after losing the “Buffett Seal of Approval.”
Regulatory Arbitrage and the Open Finance Advantage
One of the most overlooked aspects of the Buffett exit is the widening regulatory gap between the United States and Brazil. In 2026, the Central Bank of Brazil’s “Open Finance” framework has reached full maturation, allowing Nubank to ingest data from competitors and offer tailored products with surgical precision.
Conversely, US banks have struggled with a “higher-for-longer” interest rate environment and stricter capital requirements. By exiting Nubank, Buffett arguably missed out on a region where the regulatory wind is firmly at the back of digital disruptors. Nubank has capitalized on this by expanding its ecosystem to include Cardano (ADA), Near (NEAR), and Cosmos (ATOM), diversifying its treasury beyond the initial 1% Bitcoin allocation established in 2022.
| Metric (Q1 2025/26) | Nubank (NU) | Traditional Peer Avg. |
|---|---|---|
| Net Income Growth (YoY) | +47% | +5-8% |
| Active Customers | 100M+ | Stagnant |
| Cost to Serve per Customer | $0.90 | $15.00+ |
Did Buffett Sell Too Early?
As of August 2026, NU shares are trading significantly higher than the $11.83 price point of Berkshire’s final exit. While Buffett secured a $250 million gain, the opportunity cost appears high. However, for a firm like Berkshire Hathaway, which now manages a massive liquidity pile adjusted for 2026 market shifts, the move was likely less about Nubank’s potential and more about a macro-level retreat from “frontier” fintech.
Nubank’s trajectory suggests that the digital banking revolution does not require a legacy endorsement to thrive. With a customer base exceeding 100 million and a treasury that intelligently navigates both fiat and digital assets, the bank is no longer the “risky bet” it was in 2021. It is now the benchmark against which all 2026 fintech performance is measured.
“The departure of traditional capital often marks the transition of a startup into a systemic institution. Nubank has officially crossed that threshold.”
For those tracking the broader intersection of technology and market shifts, the evolution of digital platforms remains a key indicator of future volatility. Whether it’s the optimization of digital ecosystems or the expansion of global fintech, the shift toward algorithmic efficiency is irreversible.
