Worldwide drops for AI stocks send Wall Street toward its worst day since July

NEW YORK — Drops for stocks in the artificial-intelligence industry are dragging markets down worldwide on Thursday, while oil prices hit their highest levels since May on worries about the war with Iran. The S&P 500 fell 1.4 percent toward its worst day since July, while the Nasdaq composite tumbled 2.8 percent. The weakness for tech stocks was so overwhelming that it masked strength for the rest of the market, where the majority of U.S. stocks actually rose. The Dow Jones Industrial Average was down only a modest 0.2 percent, or 113 points, as of 2:30 p.m. Eastern time. AI-related stocks have become shaky on worries that their boom may be under threat because of how expensive it’s become to borrow money to build data centers and buy more AI chips. Concerns also remain that their prices shot too high following a yearslong frenzy, even though companies in the industry continue to report growth. Lam Research, whose equipment and services help make semiconductors, reported gains in profit and revenue for the summer that were slightly stronger than analysts expected, for example. Usual