Nvidia Corp.'s sinking stock valuation is sending a warning signal about the chipmaker's prospects for maintaining its booming profit growth. At less than 17 times profit expected over the next 12 months, Nvidia's shares are trading near the cheapest level in more than a decade, according to data compiled by Bloomberg. The multiple is half what the stock commanded in 2025, when Nvidia's revenue and profit growth was slower, and down from more than 25 times earnings estimates as recently as May.