Sebastian Siemiatkowski (Fintech / BNPL) at Klarna — Stockholm, Sweden

Sebastian Siemiatkowski co-founded Klarna in Stockholm in 2005 while still a student, creating the buy-now-pay-later model that would spread globally. Klarna became Europe's most valuable fintech, peaked at a $45.6 billion valuation, and then dropped to $6.7 billion during the 2022 downturn before rebounding toward a 2024 IPO on the New York Stock Exchange. Siemiatkowski is known for his media presence and aggressive product pivots toward AI-driven banking experiences.