Here's everything you need to know before Tuesday's opening bell:
Comcast is reportedly exploring financing to challenge Disney's purchase of much of Twenty-First Century Fox .
Takeda reaches a deal to buy Shire for $62.4 billion.
Activist investor ValueAct Capital Partners has built a roughly $1.2 billion stake in Citigroup .
Elon Musk bought 33,000 more shares of Tesla .
U.S. stock futures pointed lower as investors await Trump's decision on the Iran nuclear deal.
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