Here's everything you must know before Monday's opening bell:

  1. Sprint (S - Get Report) fell premarket on fears that regulators would block its proposed $26.5 billion merger with T-Mobile (TMUS - Get Report) . 
  2. Walmart (WMT - Get Report) sold its U.K. supermarket business Asda to J Sainsbury (JSAIY) for $10.1 billion. 
  3. Marathon (MPC - Get Report)  reportedly plans to buy pipeline and refining company Andeavor (ANDV) for more than $20 billion.
  4. Prologis PLD buys logistics-property rival DCT  (DCT) for $8.4 billion.
  5. U.S. stock futures pointed toward a higher open. 

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