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Nvidia, Microsoft shares tumble as China-based AI app DeepSeek hammers tech giants

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China -based AI app DeepSeek tops Apple 's app-store charts.

Shares of Nvidia , Microsoft , Alphabet and Amazon all fall in early trading on Monday .

The dip interrupts a yearslong surge for tech giants driven by enthusiasm about the future of AI .

Analyst: " One skeptical headline can knock the market off its axis".