LIVEMarkets rolling coverageStarted: July 28, 2026, 4:00 AM EDTUpdated: July 28, 2026, 5:00 AM EDT Nasdaq, S&P 500 futures fall as chip sector tumbles and AI jitters grow July 28, 2026, 5:00 AM EDT. US technology shares retreated, with Nasdaq-100 futures dropping 0.9% and S&P 500 futures off 0.2%, as shares of South Korea’s Samsung Electronics and SK Hynix each plunged more than 13% in a chip sector sell-off. Investor sentiment around the AI trade cooled amid concerns over Nvidia’s $250 billion funding lifeline for OpenAI and mounting competition out of China. In contrast, Dow futures rose 0.1%, oil prices