Stocks Slip as Oil, Treasury Yields and AI Fears Collide

A 5% yield on the benchmark 10-year Treasury note was the clearest warning signal on Wall Street Monday. The rate briefly crossed that threshold for the first time since 2023, tightening financial conditions just as crude prices surged and investors reassessed the economics of the artificial-intelligence boom.

The S&P 500 fell 0.5% to 7,619.98, while the Nasdaq Composite slipped 0.6% to 26,186.41, according to market data reported by the Associated Press. The Dow Jones Industrial Average lost about 0.3%. The declines were restrained compared with the sharper losses early in the session, but the market’s internal rotation was more pronounced.

Chipmakers bore the brunt. Nvidia shares dropped 3.4%, Intel fell 5.6%, and other semiconductor and AI-infrastructure names weakened after Anthropic chief executive Dario Amodei called for a slower pace of frontier-model development. OpenAI CEO Sam Altman and Elon Musk, whose SpaceX owns xAI, also backed versions of the warning.

That message struck at the most crowded trade in the market: the assumption that ever-larger AI models will keep driving enormous purchases of processors, networking equipment and data-center capacity. The concern is not that demand disappears overnight. It is that a pause in model development could delay capital spending or redirect it toward safety, testing and cybersecurity.

That helped explain the day’s sharp divergence. CrowdStrike and Palo Alto Networks jumped roughly 14% and 13%, respectively, as investors looked for beneficiaries of a more defensive approach to AI. The gains were not large enough to offset losses in chip stocks, but they showed money moving within technology rather than abandoning the sector altogether.

Oil added a second inflationary shock. Brent crude climbed above $107 a barrel after attacks disrupted a Saudi pipeline that bypasses the Strait of Hormuz, while renewed security concerns threatened the reliability of one of the world’s most important energy corridors. Higher fuel costs raise the prospect of stickier inflation, which in turn pushes bond yields higher.

Markets were also bracing for the Federal Reserve’s September 16 decision. CME FedWatch showed traders assigning roughly 90% odds to a quarter-point rate increase, a sharp repricing from earlier expectations for policy easing. Higher oil and higher yields leave investors facing an uncomfortable combination: slower growth, more expensive money and less room for richly valued technology shares to make mistakes.