At above 36 times sales, Nvidia's shares are trading at their highest valuation ever, according to Trivariate Research. Adam Parker's research firm looked at all the other times in market history when stocks traded above a 36 price-to-sales ratio and what happened next. When Nvidia joined the trillion-dollar market cap club briefly last week, it was clearly based on anticipation of a future AI revenue windfall. To be clear, Parker and his firm are not advocating shorting Nvidia's stock anytime soon. Still, the eye-popping valuation should give investors looking to buy Nvidia at these levels some pause.

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Persons: Adam Parker's, Trivariate, Parker, Michael Bloom Organizations: Research, Nvidia