Here's everything you must know before Monday's opening bell:
Sprint fell premarket on fears that regulators would block its proposed $26.5 billion merger with T-Mobile .
Walmart sold its U.K. supermarket business Asda to J Sainsbury for $10.1 billion.
Marathon reportedly plans to buy pipeline and refining company Andeavor for more than $20 billion.
Prologis PLD buys logistics-property rival DCT for $8.4 billion.
U.S. stock futures pointed toward a higher open.
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