UnitedHealth Group shares surged after the insurer gave a positive outlook about its Medicare Advantage members. Getty Images Close × Shares of Nebius Group (NBIS) skyrocketed as the artificial intelligence infrastructure provider announced a deal with Microsoft (MSFT) that could be worth up to $19.4 billion. Microsoft shares rose slightly. CoreWeave (CRWV) shares also gained after the AI cloud computing platform launched a venture initiative designed to support founders of new AI efforts. Freeport-McMoRan ...