New York (AP) - The U.S. stock market tumbled Thursday to one of its worst days since its springtime sell-off, as Nvidia and other AI superstar stocks kept dropping on worries their prices shot too high. Also hurting the market were questions about whether coming cuts to interest rates that Wall Street has been banking on will actually happen.

The S&P 500 sank 1.7% and pulled further from its all-time high set late last month. It was the worst day in a month for the index at the heart of many 401(k) accounts and the second-worst since April’s plunge after President Donald Trump shocked the world with his “Liberation Day” tariffs.

The Dow Jones Industrial Average dropped 797 points, or 1.7%, from its record set the day before, while the Nasdaq composite lost 2.3%.

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