Wall Street tumbles, and US stocks head toward their worst loss in a month

NEW YORK (AP) — U.S. stocks are tumbling on Tuesday, and some of Wall Street’s biggest stars are leading the way lower.

The S&P 500 sank 1.2% and was on track for its worst loss in a month. The Dow Jones Industrial Average was down 498 points, or 1.1%, as of 9:37 a.m. Eastern time, and the Nasdaq composite was down a market-leading 1.4%. All three are still close to their recently set records .

Nvidia and other companies that have benefited from the frenzy around artificial-intelligence technology were some of the heaviest weights on the market. They have soared for years on expectations that they’re at the vanguard of the next revolution for the global economy. But they’ve also shot so high that critics say their prices have simply become too expensive.

Nvidia, whose chips are po