Stock market today: Dow falls, S&P 500 and Nasdaq rise as AMD surges on OpenAI deal, shutdown drags on
US stocks were mixed on Monday as the federal government shutdown entered another week, while a megadeal between AMD (AMD) and OpenAI (OPAI.PVT) lifted hopes for the AI trade. The Nasdaq Composite (^IXIC) led the way higher, rising 0.7% amid an over-25% …