Klarna Group Plc Chief Executive Officer Sebastian Siemiatkowski didn’t sell any shares in his company’s blockbuster IPO this week — but he still managed to use the listing to consolidate his control over the company.  Ahead of the offering, the 43-year-old founder pledged Klarna shares as collateral to secure a $112 million loan, according to a person familiar with the matter. The lender SEB AB provided the funding last month, with Siemiatkowski pledging a roughly $980 million stake in exchange as collat ...