The Dow Jones Industrial Average fell 458.54 points, or 0.87%, to 52,288.78 in morning trading. The Dow's steeper percentage decline compared with the broader market reflected its lighter weighting toward technology stocks, a sector that has been at the center of a separate, ongoing selloff tied to concerns over artificial intelligence spending. The shortfall reinforced growing concerns among investors that the artificial intelligence spending boom, which has driven explosive profit growth across the memory chip sector over the past year, may be beginning to moderate. The pattern extended a broader rout that has hit chip-linked stocks across multiple markets over the past several trading sessions. Investors are also closely watching two major earnings reports due this week from companies among the largest spenders on artificial intelligence infrastructure.