Here's what you must know to begin this week of trading.
U.S. stock futures surge on Monday, with Dow futures up more than 200 points as investors react to the passage of the Senate tax bill.
U.S. stock futures trade lower on Monday, and European stocks are mixed as investors strike a cautious note after Chancellor Angela Merkel won a smaller-than-expected victory in Germany's federal elections.
It's a busy week of politics in the final week of September. Republicans' final push for healthcare in the Senate and tax reform details should keep markets on their toes.
It was another rough day for the Nasdaq, its second in a row, as a selloff in tech stocks resumed.