Here's everything you need to know before Tuesday's opening bell

  1. Comcast (CMCSA - Get Report) is reportedly exploring financing to challenge Disney's (DIS - Get Report) purchase of much of Twenty-First Century Fox (FOXA) . 
  2. Takeda (TKPYY) reaches a deal to buy Shire (SHPG) for $62.4 billion. 
  3. Activist investor ValueAct Capital Partners has built a roughly $1.2 billion stake in Citigroup (C - Get Report) . 
  4. Elon Musk bought 33,000 more shares of Tesla (TSLA - Get Report) .
  5. U.S. stock futures pointed lower as investors await Trump's decision on the Iran nuclear deal. 

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