LONDON — After 20 years in the role as Klarna's CEO, Sebastian Siemiatkowski is about to face his toughest test yet as the financial technology firm prepares for its blockbuster debut in New York.

Sebastian Siemiatkowski has been CEO of Klarna for 20 years. He now faces his biggest test yet with a U.S. IPO fast ...

Swedish fintech brought ‘pay in four’ to everything from food to fashion but sceptics point to model’s vulnerabilities ...

Affirm shares are tumbling after rival Klarna, which is preparing to go public in the U.S., said it is now the exclusive provider of Buy Now, Pay Later loans for Walmart.