S&P 500 today: S&P reverses losses to rise 0.4% while Nvidia sinks 5% — Why Meta’s chip shift is shaking the AI trade as Alphabet jumps 4%

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S&P 500 today rose 0.4% as the Nasdaq slipped and Nvidia sank 5%. Meta is weighing Google AI chips, spooking investors and shaking the AI trade. Alphabet jumped 4%, nearing a $4 trillion valuation.