Wall Street's favorite disruptor, Amazon.com (AMZN) , has struck once again. Following its landmark acquisition of Whole Foods (WFM) , Amazon announced that it will be acquiring smart doorbell maker Ring for around $1 billion. 

Ring manufacturers doorbells that allow users to see who is at the door before they answer. 

This latest bout of M&A is far from the first time the Bezos-led company has opened up its checkbook in a significant way. Check out some of Amazon's biggest acquisitions.  

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