Nasdaq futures crash more than 540 points: 5 things to know before Wall Street opens

US equity futures declined ahead of this week's Federal Reserve decision as a global selloff in artificial-intelligence shares coincided with another rise in oil prices. Nasdaq 100 futures fell 542 points, or 1.8%, while S&P 500 futures lost 0.7% and Dow futures slipped 0.2%, signaling broad risk-off positioning led by technology.