Wall Street churned to a mixed finish as a long list of worries looms, even if the most pressing crisis seems to be calming as Washington moves to avoid a default on its debt. The S&P 500 was virtually unchanged Tuesday, hovering near its highest level since August. The Dow Jones Industrial Average fell 50…

Stocks rose on Wall Street, led by more gains in technology stocks as another chipmaker reported strong demand related to artificial intelligence. The S&P 500 rose 1.3 percent Friday, and the Nasdaq rose 2.2 percent. The Dow added 1 percent. Marvell Technology jumped 33 percent after saying it expects AI revenue to at least double…

Wall Street’s building mania around artificial intelligence helped lift the market, even as worries worsen about political rancor in Washington. The S&P 500 rose 0.9 percent Thursday after chipmaker Nvidia gave a monster forecast for upcoming sales as it benefits from the rush into AI. Because of its immense size, Nvidia is one of the…

Wall Street fell again, part of a worldwide swoon for stocks as worries about the economy pile higher. The S&P 500 fell 0.7 percent Wednesday after House Speaker Kevin McCarthy said Republicans and Democrats remain far apart in efforts to prevent a default on the U.S. government’s debt. The main U.S. stock index is on…