Moderna reported a surprising third-quarter profit on Thursday, driven by cost reductions and stronger-than-expected sales of its COVID-19 vaccine, despite lower-than-anticipated revenue from its new respiratory syncytial virus (RSV) vaccine. Shares of the Cambridge, Massachusetts-based company jumped 11% in premarket trading. For the quarter, Moderna posted a profit of $13 million, or 3 cents per share, compared to a loss of $3.6 billion in the same period last year. Analysts had expected a loss of...

Under Armour’s shares soared 25% on Thursday after the sportswear giant raised its annual profit forecast, citing lower input costs and effective cost-saving measures, such as reducing discounts at its stores and website. The strong performance came after several quarters of disappointing results, prompting company founder Kevin Plank to return as CEO. Plank’s plan to reset the business includes reducing headcount and scaling back inventory on select products. Under Armour and Nike are working to...