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

  1. Amazon (AMZN) confirmed hundreds of corporate layoffs. 
  2. AmerisourceBergen (ABC) gained premarket on reports that Walgreens (WBA) may buy the portion it doesn't already own.
  3. GM (GM) will shutdown an underutilized plant in South Korea. 
  4. Barnes & Noble (BNK) is reportedly laying off lead cashiers, digital leads and other experienced workers. 
  5. U.S. stock futures were under pressure following Monday's strong gains. 

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