Stocks drifted to a mixed close on Wall Street and oil prices fell after the U.S. and Iran paused their attacks while work resumed on restarting negotiations to end their war. The S&P 500 ended barely changed Monday, up less than 0.1%. The index is coming off two straight weekly losses. The Dow Jones Industrial Average rose 0.5%. The Nasdaq composite fell 0.2%, weighed down by a 5% drop in AI chip giant Nvidia. After shooting as high as $102 a barrel last week, Brent crude fell 6.3% to settle at $85.87 per barrel. Treasury yields fell in the bond market.