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

  1. Amazon (AMZN - Get Report) confirmed hundreds of corporate layoffs. 
  2. AmerisourceBergen (ABC - Get Report) gained premarket on reports that Walgreens (WBA - Get Report) may buy the portion it doesn't already own.
  3. GM (GM - Get Report) 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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