Walmart Shares Rise 7% on Strong Sales Report
Plus: the Dow touches 40000 before closing lower. Chubb shares climb 4.7% after Warren Buffett\u2019s Berkshire Hathaway announces a $6.7 billion stake in the insurer. J.R. Whalen reports.\n\n\n\nSign up for the WSJ's free What's News newsletter.\n\nLearn more about your ad choices. Visit megaphone.fm/adchoices