Nvidia’s market cap swung a jaw-dropping $1 trillion in just 54 hours, after its blowout earnings were followed by a rapid profit-taking sell-off. The chipmaker initially gained around $450 billion as AI demand fueled investor optimism, but then slumped, shedding $600 billion as sentiment cooled. The gyrations have reignited concerns of an AI valuation bubble, even as Nvidia’s fundamentals remain strong.