Nvidia turned red on Wednesday, giving up a sizable gain, even after what appeared to be impeccable results and guidance . That left investors and traders scrambling to find out why. One analyst may have the answer. Out of Wall Street's major investment banks, Deutsche Bank stood alone Wednesday with its neutral stance on Nvidia . The analyst seemed to be the only one with a negative comment on the artificial intelligence poster child following its report of earnings and revenue that exceeded consensus estimates, alongside a 66% year-over-year rise in data center sales. Ross Seymore gave mainly one reason: valuation. Seymore wrote that, although he remains bullish on Nvidia in the long run, his current rating reflects the fact that incredible expectations over the next two years already se

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