NEW YORK (AP) — Most U. S. stocks rose on Thursday, and the Dow Jones Industrial Average rallied to another record, but more drops for computer chip companies and other winners of the artificial-intelligence boom kept indexes mixed. The S&P 500 finished the day virtually unchanged and edged up by less than 0. 1%, even though seven out of every 10 stocks within the index rose. The Dow jumped 594 points, or 1. 1%, while the Nasdaq composite dropped 0. 8% after erasing an early gain. Stocks a...