Brent surges 7.8% to $81.92 as AI rout drags S&P 500 down 0.7% — dual shock

Equity markets, meanwhile, were convulsed by a deepening rout in AI-exposed chipmakers, which had been among the biggest beneficiaries of the artificial intelligence euphoria. The S&P 500 fell 0.7%, giving back ground after four winning weeks in five, while the tech-heavy Nasdaq composite dropped 1.4%. The Dow Jones Industrial Average lost 121 points, or 0.2%. The heaviest weight on the S&P 500 was Nvidia, which fell 3.2% as questions about the sustainability of AI demand mounted. The company’s massive index weighting, swollen by its role as the AI kingmaker, amplified the drag. Micron Technology, another AI bellwether, sank 4.9%, cutting into what had been a stellar 243.1% year-to-date gain. The selloff began in Asia, where South Korea’s Kospi index plunged 8.9% and SK Hynix—a critical supplier of high-bandwidth memory for AI accelerators—recorded a 15.4% crash, its worst single-day loss since it began trading in 1997.

The twin narratives—geopolitical oil shock and AI bubble fears—are not entirely independent. A sustained oil price rise would reinject inflationary pressure into the global economy at a time when central banks are cautiously normalizing policy. Higher fuel costs eat into consumer spending and corporate margins, which could curtail the enterprise technology budgets that have underpinned the AI buildout. Moreover, the dramatic reversal in chip stocks signals that investors are beginning to discount the risk that the AI investment cycle may not deliver the profits and productivity gains that had been priced in. For the oil market, the immediate question is whether the blockade and payment demands can be resolved diplomatically, or if the Strait of Hormuz becomes a persistent choke point reminiscent of the 1980s Tanker War. For equities, the key variable is whether the AI drawdown deepens into a prolonged correction, or stabilizes as a healthy digestion of overheated valuations. In either case, the interplay between energy costs and technology spending is set to become a defining tension for portfolios in the second half of 2026.