S&P 500 Eyes Longest Losing Run Since August on AI, Crypto Fears

US stocks suffered another jarring session on Tuesday, with the S&P 500 Index posting its longest slide since August as a six-month rally teetered amid fears around stretched artificial-intelligence valuations.

The benchmark equities gauge fell for a fourth day, sliding 0.8% after dropping as much as 1.5%. The technology-heavy Nasdaq 100 Index declined 1.2% — leaving it down 6% from its October peak. A basket of the Magnificent Seven companies declined 1.8%. Nvidia Corp., at the center of the AI frenzy, slumped 2.8% ahead of its earnings report after Wednesday’s close. Amazon.com Inc. and Microsoft Corp. fell 4.4% and 2.7%, respectively, after a ratings downgrade.