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Tech stocks see worst week in months after ‘nobody saw DeepSeek coming’ amid AI mania

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S&P 500's technology sector ended its worst week since early September .

Chinese artificial-intelligence company DeepSeek seemed to startle investors’ perception of winners and losers in the stock market’s AI craze.

Big Tech stocks have benefitted from investor optimism that generative AI will bring about stronger corporate profits and productivity.

The Research Affiliates Fundamental Index , known as RAFI , fared better than the S&P 500 when the dot-com bubble burst.

Both RAFI US and the Schwab Fundamental U.S. Large Company ETFs slipped 0.2% this week , finishing January with a year-to-date gain of around 4% ..