Sebastian Siemiatkowski

Net worth over time

Biography

• Siemiatkowski cofounded Klarna in 2005, pioneering the buy-now, pay-later model in fintech. The firm lets consumers pay for small and large retail items in installments.
• Klarna went public in September 2025 on the New York Stock Exchange at a $15 billion valuation; Siemiatkowski owns a 7% stake.
• Klarna was valued by private investors at $45.6 billion in 2021, but the company's valuation was marked down significantly to $6.7 billion for its next funding round in 2022.
• Siemiatkowski attended the Stockholm School of Economics and worked at an accounts-receivable factoring firm before starting Klarna.
• Klarna is a fully licensed bank in Europe, where it offers checking accounts, savings accounts and debit cards.
• Investors in Klarna include Sequoia Capital, BlackRock, Silver Lake, Bestseller Group and Ant Group.
• He met one of his Klarna cofounders while the two were flipping burgers at a Burger King in Sweden.

Financial assets