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NEW YORK -- A sell-off for tech stocks got even worse Friday on worries that Wall Street's frenzy around artificial-intelligence technology sent prices too high.
The S&P 500 tumbled 1.8% for its worst day since June, and it closed out a third straight losing week. The weakness for technology stocks dragged the Nasdaq composite down a market-leading 2.9%, while the Dow Jones Industrial Average dropped 572 points, or 1.1%.
The U.S. stock market remains only 3.1% below its all-time high, which has boosted the value of workers' 401(k) accounts, but it's become increasingly shaky as Tuesday's midterm elections in the United States approach. Worries about AI in general have already become a concern for voters across political parties, and President Donald Trump has historically used the stock market's performance as a measure of his own success.
Intel's stock led the way lower and plunged 28.6% for its worst drop since 1974. The chipmaker gave a forecast for profit in the final three months of this year that fell short of analysts' expectations, as CEO Lip-Bu Tan said the personal-computer industry continues to feel pressure. The drop came even though Intel reported a stronger profit for the latest quarter than analysts expected.
Amazon fell 1.4% after reporting a weaker profit for the summer than analysts expected. Potentially more concerning for investors was Amazon's reporting that it burned through $42.4 billion of cash over the prior 12 months, according to a measure called free cash flow. It spent $94.8 billion on property and equipment, primarily through investments in artificial-intelligence technology.
A day earlier, Alphabet's stock dropped more than 12% to its worst day on record and dragged the S&P 500 down after telling investors it burned through more cash during the summer than the spring. The company behind Google and YouTube cited similar, mammoth investments in AI.
Worries are rising about whether all the hundreds of billions of dollars will produce enough profit and productivity to make the investment worth it. At the same time, stocks of computer chip companies and other winners from the frenzy to build AI data centers have come under pressure on concerns that high interest rates may slow the further build out of data centers.
"We're moving out of the hopes and dreams phase of the AI trade and into the 'show me' phase," said Joe Tigay, portfolio manager at Equity Armor Investments, in a note to investors.
A drop of 4.2% for Nvidia, the chip company that became the poster child of the AI frenzy, was the heaviest force pulling the S&P 500 downward, outweighing even Intel.
In the cryptocurrency industry, meanwhile, stocks tumbled following a hack on the world's biggest crypto exchange. The price of bitcoin fell below $77,000 from more than $86,000 earlier this month, and a U.S.-based blockchain intelligence firm said a North Korean unit was likely behind the attack that impacted more than $6 billion worth of crypto at Binance.