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Interview

February 6, 2025

How Klarna CEO spends his fortune taking big bets on fast-growing startups: 'We've made some investments we regret'

The Siemiatkowskis’ little-known family office has been active since 2013 and lists ChatGPT and other AIs as staff members

Tom Matsuda

5 min read

Flat Capital, the investment firm managing Sebastian Siemiatkowski's wealth, has been quietly expanding its AI startup portfolio as the Klarna CEO continues to advocate for the efficiency gains enabled by the technology. 

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Sebastian Siemiatkowski, CEO of Klarna
Sebastian Siemiatkowski, CEO of Klarna
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Tom Matsuda

Tom Matsuda is a fintech reporter at Sifted and writes our weekly fintech newsletter. Find him on X and LinkedIn

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