WNEW YORK — U.S. stock indexes fell sharply Thursday as Wall Street’s frenzy around artificial-intelligence technology faltered some more.

The S&P 500 sank 1.6% for its fifth drop in six days after setting an all-time high last week. Concerns about the U.S. economy’s future have been behind much of the drop, including worries about how tariffs pushed by President Donald Trump could worsen inflation, and Wall Street’s main measure of health has lost all but 1.4% of its rally since Election Day.

The Dow Jones Industrial Average dropped 193 points, or 0.4%, and the Nasdaq composite tumbled 2.8%.

Weighing most heavily on the market was superstar stock Nvidia, one of Wall Street’s most influential companies that’s been leading the market for years. After initially rising at the open of trading following a better-than-expected profit report, Nvidia quickly slid to a loss of 8.5%.

Better-than-expected earnings reports have become routine for Nvidia, whose chips are powering the surge into artificial-intelligence technology, but this was the company’s first since DeepSeek shook the entire AI industry.