We recently published 10 Stocks Melt Down in Hours. Upstart Holdings, Inc. (NASDAQ:UPST) is one of the worst performers on Wednesday. Upstart snapped a four-day winning streak on Wednesday, shedding 9.43 percent to end at $62.42 apiece after its fellow “buy now, pay later” company, Klarna Group PLC (NYSE:KLAR), soared on its market debut. On Wednesday, Klarna Group PLC opened at$57.2, also its highest during the day, before ending the day just up by 14.55 percent at $45.82 apiece. The newly listed firm ...