US markets today: Dow climbs to record high as AMD rally fuels AI optimism; Nasdaq slips amid valuation worries
US stocks moved in mixed trade on Wednesday as investors balanced renewed enthusiasm for artificial intelligence (AI) plays with lingering concerns over inflated tech valuations and slowing economic signals. The Dow Jones Industrial Average surged 309 points, or 0.6%, to hit another record, while the S&P 500 dipped 0.1%, staying close to its all-time high….