美股三大指数收盘涨跌不一，道指涨0.55%，纳指跌0.44%

Group 1 - The core viewpoint of the article indicates that the U.S. stock market experienced mixed results on January 9, with the Dow Jones Industrial Average increasing by 0.55% and the S&P 500 index rising slightly by 0.01%, while the Nasdaq Composite fell by 0.44% [1]