Klarna's stock plunged 27 per cent last week after reporting rapid growth in its Fair Financing product, which offers longer-term loans. Unlike its original buy-now-pay-later business, these loans generate income over time through interest payments rather than upfront fees, creating a different cash flow profile that caught investors off guard.

While Klarna's traditional BNPL model resembles software companies like Microsoft or Netflix—adding customers with minimal incremental risk—its new lending business faces the same challenges as traditional banks. The company's fourth-quarter adjusted operating profit of $47 million fell nearly a third below analyst forecasts. CEO Sebastian Siemiatkowski maintains this was part of the plan, but investors are struggling to value the fintech appropriately.

The valuation challenge is stark: Klarna trades at 7.5 times forecast 2027 operating income, cheap compared to BNPL rival Affirm at 24 times but below digital bank Nubank and JPMorgan at around 10 times. As Klarna increasingly resembles a bank, it faces pressure to deliver consistent results. Unlike tech companies that can weather volatility, banks like JPMorgan have missed quarterly estimates only twice in a decade. For a company once valued as Europe's most valuable private tech group, Klarna now finds itself as just another small-cap financial stock, with investors watching closely to see if it can balance growth with banking's inherent risks.