Klarna signage during the company's IPO at the New York Stock Exchange on Sept. 10. Klarna Group Plc rose 15% in its trading debut after the company and some of its backers raised $1.37 billion in an initial public offering that signals the market for new listings has room to run. The financial services company’s shares, which rose as much as 43% Wednesday, closed at $45.82 each in New York, above the IPO price of $40 apiece. The double-digit oversubscribed offering priced on Tuesday above the marketed r ...