Instant gratification is not something financial regulators are inclined to applaud, however, and some of them look sideways at the very idea of buy now, pay later. The market feels otherwise. A funding round this past June boosted Klarna’s valuation to $45.6 billion, making it the world’s second-largest private fintech company (the Irish-American firm Stripe is the largest). Sebastian, who turns 40 in October, owns just under 10 percent of it.

https://www.wsj.com/articles/klarna-ceo-sebastian-siemiatkowski-home-11632400195?mod=searchresults_pos4&page=1