U.S. stocks ended firmly higher Monday, although coming off their best levels of the session, as recent polls showed support swinging back toward the U.K. remaining a member of the European Union ahead of its Thursday referendum. The Dow Jones Industrial Average finished up 134 points, or 0.8%, at 17,806. A sharp rise in shares of Goldman Sachs Group Boeing Co. and 3M Company contributed about 60 points to the blue-chip index. Meanwhile the S&P 500 index rose 12 points, or 0.6%, to 2,083, and the Nasdaq Composite Index climbed 36 points, or 0.8%, to 4,837.
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