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

US stocks sank, putting the S&P 500 Index on track for its longest slide since August, as a six-month rally shows signs of cracking following a $1.2 trillion selloff in cryptocurrencies and amid fears around stretched artificial-intelligence valuations.

The benchmark equities gauge dropped for a fourth day, declining 0.7% as of 9:33 a.m. on Tuesday in New York, as investors reconsidered their optimistic expectations for Federal Reserve interest-rate cuts. The technology-heavy Nasdaq 100 Index fell 0.9%. A basket of the Magnificent Seven companies declined 1%. Nvidia Corp., at the center of the AI frenzy, slumped an additional 1.5% ahead of its earnings report on Wednesday. Amazon.com Inc. and Microsoft Corp. fell more than 1% after a ratings downgrade. The Cboe Volatility Index jumped to nearly 24 — above the key 20 level that causes concern for traders.

Stock indexes fell globally. Topping the list of worries are AI valuations and whether the Fed will cut rates next month. Traders have less conviction about another reduction in borrowing costs, with swaps now implying a less-than-50% likelihood of a December rate cut. Several policymakers have recently cautioned against a cut, although Fed Governor Christopher Waller repeated his view in favor of lowering rates.

Among other individual stocks, Home Depot Inc. dropped 3.8% after cutting its full-year earnings guidance, warning that some unsteady consumers are hitting the pause button on big-ticket home purchases. Target and Lowe’s will post results Wednesday, followed by Walmart and Gap on Thursday. Bitcoin briefly dropped below $90,000 for the first time in seven months — and traders are betting on more downside. Meanwhile, a Bank of America Corp. survey showed that fund managers’ cash holdings have fallen to levels that have triggered a sell signal in the past.

“Appetite for AI is under pressure from circularity worries and bubble fears,” said Ipek Ozkardeskaya, a senior analyst at Swissquote. “The bad news is that some of the more bullish vibes — AI enthusiasm, massive government stimulus, dovish central-bank expectations — are starting to fade.”

The chorus of warnings about a possible AI bubble grew on Tuesday after JPMorgan Chase & Co. Vice Chairman Daniel Pinto warned that valuations in the industry could be due for a correction. “That correction will also create a correction in the rest of the segment, the S&P and in the industry,” Pinto said at the Bloomberg Africa Business Summit in Johannesburg.